Move guc_id allocation under submission state sub-struct as a future patch will reuse the spin lock as a global submission state lock. Moving this into sub-struct makes ownership of fields / lock clear.

v2: (Docs) - Add comment for submission_state sub-structure v3: (John Harrison) - Fixup a few comments v4: (John Harrison) - Fix typo

Signed-off-by: Matthew Brost matthew.brost@intel.com Reviewed-by: John Harrison John.C.Harrison@Intel.com --- drivers/gpu/drm/i915/gt/intel_context_types.h | 6 +-- drivers/gpu/drm/i915/gt/uc/intel_guc.h | 28 +++++++---- .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 46 ++++++++++--------- 3 files changed, 46 insertions(+), 34 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h b/drivers/gpu/drm/i915/gt/intel_context_types.h index 12252c411159..e7e3984aab78 100644 --- a/drivers/gpu/drm/i915/gt/intel_context_types.h +++ b/drivers/gpu/drm/i915/gt/intel_context_types.h @@ -197,18 +197,18 @@ struct intel_context { struct { /** * @id: handle which is used to uniquely identify this context - * with the GuC, protected by guc->contexts_lock + * with the GuC, protected by guc->submission_state.lock */ u16 id; /** * @ref: the number of references to the guc_id, when * transitioning in and out of zero protected by - * guc->contexts_lock + * guc->submission_state.lock */ atomic_t ref; /** * @link: in guc->guc_id_list when the guc_id has no refs but is - * still valid, protected by guc->contexts_lock + * still valid, protected by guc->submission_state.lock */ struct list_head link; } guc_id; diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h index 5dd174babf7a..82e248c2290c 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h @@ -71,16 +71,26 @@ struct intel_guc { } interrupts;

/** - * @contexts_lock: protects guc_ids, guc_id_list, ce->guc_id.id, and - * ce->guc_id.ref when transitioning in and out of zero + * @submission_state: sub-structure for submission state protected by + * single lock */ - spinlock_t contexts_lock; - /** @guc_ids: used to allocate unique ce->guc_id.id values */ - struct ida guc_ids; - /** - * @guc_id_list: list of intel_context with valid guc_ids but no refs - */ - struct list_head guc_id_list; + struct { + /** + * @lock: protects everything in submission_state, + * ce->guc_id.id, and ce->guc_id.ref when transitioning in and + * out of zero + */ + spinlock_t lock; + /** + * @guc_ids: used to allocate new guc_ids + */ + struct ida guc_ids; + /** + * @guc_id_list: list of intel_context with valid guc_ids but no + * refs + */ + struct list_head guc_id_list; + } submission_state;

/** * @submission_supported: tracks whether we support GuC submission on diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c index ba0de35f6323..48bdcdb823b3 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -68,7 +68,7 @@ * fence is used to stall all requests associated with this guc_id until the * corresponding G2H returns indicating the guc_id has been deregistered. * - * guc_ids: + * submission_state.guc_ids: * Unique number associated with private GuC context data passed in during * context registration / submission / deregistration. 64k available. Simple ida * is used for allocation. @@ -89,7 +89,7 @@ * sched_engine can be submitting at a time. Currently only one sched_engine is * used for all of GuC submission but that could change in the future. * - * guc->contexts_lock + * guc->submission_state.lock * Protects guc_id allocation for the given GuC, i.e. only one context can be * doing guc_id allocation operations at a time for each GuC in the system. * @@ -103,7 +103,7 @@ * * Lock ordering rules: * sched_engine->lock -> ce->guc_state.lock - * guc->contexts_lock -> ce->guc_state.lock + * guc->submission_state.lock -> ce->guc_state.lock * * Reset races: * When a full GT reset is triggered it is assumed that some G2H responses to @@ -1148,9 +1148,9 @@ int intel_guc_submission_init(struct intel_guc *guc)

xa_init_flags(&guc->context_lookup, XA_FLAGS_LOCK_IRQ);

- spin_lock_init(&guc->contexts_lock); - INIT_LIST_HEAD(&guc->guc_id_list); - ida_init(&guc->guc_ids); + spin_lock_init(&guc->submission_state.lock); + INIT_LIST_HEAD(&guc->submission_state.guc_id_list); + ida_init(&guc->submission_state.guc_ids);

return 0; } @@ -1215,7 +1215,7 @@ static void guc_submit_request(struct i915_request *rq)

static int new_guc_id(struct intel_guc *guc) { - return ida_simple_get(&guc->guc_ids, 0, + return ida_simple_get(&guc->submission_state.guc_ids, 0, GUC_MAX_LRC_DESCRIPTORS, GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); } @@ -1223,7 +1223,8 @@ static int new_guc_id(struct intel_guc *guc) static void __release_guc_id(struct intel_guc *guc, struct intel_context *ce) { if (!context_guc_id_invalid(ce)) { - ida_simple_remove(&guc->guc_ids, ce->guc_id.id); + ida_simple_remove(&guc->submission_state.guc_ids, + ce->guc_id.id); reset_lrc_desc(guc, ce->guc_id.id); set_context_guc_id_invalid(ce); } @@ -1235,9 +1236,9 @@ static void release_guc_id(struct intel_guc *guc, struct intel_context *ce) { unsigned long flags;

- spin_lock_irqsave(&guc->contexts_lock, flags); + spin_lock_irqsave(&guc->submission_state.lock, flags); __release_guc_id(guc, ce); - spin_unlock_irqrestore(&guc->contexts_lock, flags); + spin_unlock_irqrestore(&guc->submission_state.lock, flags); }

static int steal_guc_id(struct intel_guc *guc) @@ -1245,10 +1246,10 @@ static int steal_guc_id(struct intel_guc *guc) struct intel_context *ce; int guc_id;

- lockdep_assert_held(&guc->contexts_lock); + lockdep_assert_held(&guc->submission_state.lock);

- if (!list_empty(&guc->guc_id_list)) { - ce = list_first_entry(&guc->guc_id_list, + if (!list_empty(&guc->submission_state.guc_id_list)) { + ce = list_first_entry(&guc->submission_state.guc_id_list, struct intel_context, guc_id.link);

@@ -1273,7 +1274,7 @@ static int assign_guc_id(struct intel_guc *guc, u16 *out) { int ret;

- lockdep_assert_held(&guc->contexts_lock); + lockdep_assert_held(&guc->submission_state.lock);

ret = new_guc_id(guc); if (unlikely(ret < 0)) { @@ -1295,7 +1296,7 @@ static int pin_guc_id(struct intel_guc *guc, struct intel_context *ce) GEM_BUG_ON(atomic_read(&ce->guc_id.ref));

try_again: - spin_lock_irqsave(&guc->contexts_lock, flags); + spin_lock_irqsave(&guc->submission_state.lock, flags);

might_lock(&ce->guc_state.lock);

@@ -1310,7 +1311,7 @@ static int pin_guc_id(struct intel_guc *guc, struct intel_context *ce) atomic_inc(&ce->guc_id.ref);

out_unlock: - spin_unlock_irqrestore(&guc->contexts_lock, flags); + spin_unlock_irqrestore(&guc->submission_state.lock, flags);

/* * -EAGAIN indicates no guc_id are available, let's retire any @@ -1346,11 +1347,12 @@ static void unpin_guc_id(struct intel_guc *guc, struct intel_context *ce) if (unlikely(context_guc_id_invalid(ce))) return;

- spin_lock_irqsave(&guc->contexts_lock, flags); + spin_lock_irqsave(&guc->submission_state.lock, flags); if (!context_guc_id_invalid(ce) && list_empty(&ce->guc_id.link) && !atomic_read(&ce->guc_id.ref)) - list_add_tail(&ce->guc_id.link, &guc->guc_id_list); - spin_unlock_irqrestore(&guc->contexts_lock, flags); + list_add_tail(&ce->guc_id.link, + &guc->submission_state.guc_id_list); + spin_unlock_irqrestore(&guc->submission_state.lock, flags); }

static int __guc_action_register_context(struct intel_guc *guc, @@ -1921,16 +1923,16 @@ static void guc_context_destroy(struct kref *kref) * returns indicating this context has been deregistered the guc_id is * returned to the pool of available guc_id. */ - spin_lock_irqsave(&guc->contexts_lock, flags); + spin_lock_irqsave(&guc->submission_state.lock, flags); if (context_guc_id_invalid(ce)) { - spin_unlock_irqrestore(&guc->contexts_lock, flags); + spin_unlock_irqrestore(&guc->submission_state.lock, flags); __guc_context_destroy(ce); return; }

if (!list_empty(&ce->guc_id.link)) list_del_init(&ce->guc_id.link); - spin_unlock_irqrestore(&guc->contexts_lock, flags); + spin_unlock_irqrestore(&guc->submission_state.lock, flags);

/* Seal race with Reset */ spin_lock_irqsave(&ce->guc_state.lock, flags);

Taking a PM reference to prevent intel_gt_wait_for_idle from short circuiting while any user context has scheduling enabled. Returning GT idle when it is not can cause all sorts of issues throughout the stack.

v2: (Daniel Vetter) - Add might_lock annotations to pin / unpin function v3: (CI) - Drop intel_engine_pm_might_put from unpin path as an async put is used v4: (John Harrison) - Make intel_engine_pm_might_get/put work with GuC virtual engines - Update commit message v5: - Update commit message again

Signed-off-by: Matthew Brost matthew.brost@intel.com Reviewed-by: John Harrison John.C.Harrison@Intel.com --- drivers/gpu/drm/i915/gt/intel_context.c | 2 ++ drivers/gpu/drm/i915/gt/intel_engine_pm.h | 32 +++++++++++++++++ drivers/gpu/drm/i915/gt/intel_gt_pm.h | 10 ++++++ .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 36 +++++++++++++++++-- drivers/gpu/drm/i915/intel_wakeref.h | 12 +++++++ 5 files changed, 89 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c index d008ef8623ce..f98c9f470ba1 100644 --- a/drivers/gpu/drm/i915/gt/intel_context.c +++ b/drivers/gpu/drm/i915/gt/intel_context.c @@ -240,6 +240,8 @@ int __intel_context_do_pin_ww(struct intel_context *ce, if (err) goto err_post_unpin;

+ intel_engine_pm_might_get(ce->engine); + if (unlikely(intel_context_is_closed(ce))) { err = -ENOENT; goto err_unlock; diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.h b/drivers/gpu/drm/i915/gt/intel_engine_pm.h index 6fdeae668e6e..d68675925b79 100644 --- a/drivers/gpu/drm/i915/gt/intel_engine_pm.h +++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.h @@ -6,9 +6,11 @@ #ifndef INTEL_ENGINE_PM_H #define INTEL_ENGINE_PM_H

+#include "i915_drv.h" #include "i915_request.h" #include "intel_engine_types.h" #include "intel_wakeref.h" +#include "intel_gt_pm.h"

static inline bool intel_engine_pm_is_awake(const struct intel_engine_cs *engine) @@ -31,6 +33,21 @@ static inline bool intel_engine_pm_get_if_awake(struct intel_engine_cs *engine) return intel_wakeref_get_if_active(&engine->wakeref); }

+static inline void intel_engine_pm_might_get(struct intel_engine_cs *engine) +{ + if (!intel_engine_is_virtual(engine)) { + intel_wakeref_might_get(&engine->wakeref); + } else { + struct intel_gt *gt = engine->gt; + struct intel_engine_cs *tengine; + intel_engine_mask_t tmp, mask = engine->mask; + + for_each_engine_masked(tengine, gt, mask, tmp) + intel_wakeref_might_get(&tengine->wakeref); + } + intel_gt_pm_might_get(engine->gt); +} + static inline void intel_engine_pm_put(struct intel_engine_cs *engine) { intel_wakeref_put(&engine->wakeref); @@ -52,6 +69,21 @@ static inline void intel_engine_pm_flush(struct intel_engine_cs *engine) intel_wakeref_unlock_wait(&engine->wakeref); }

+static inline void intel_engine_pm_might_put(struct intel_engine_cs *engine) +{ + if (!intel_engine_is_virtual(engine)) { + intel_wakeref_might_put(&engine->wakeref); + } else { + struct intel_gt *gt = engine->gt; + struct intel_engine_cs *tengine; + intel_engine_mask_t tmp, mask = engine->mask; + + for_each_engine_masked(tengine, gt, mask, tmp) + intel_wakeref_might_put(&tengine->wakeref); + } + intel_gt_pm_might_put(engine->gt); +} + static inline struct i915_request * intel_engine_create_kernel_request(struct intel_engine_cs *engine) { diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.h b/drivers/gpu/drm/i915/gt/intel_gt_pm.h index 05de6c1af25b..bc898df7a48c 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_pm.h +++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.h @@ -31,6 +31,11 @@ static inline bool intel_gt_pm_get_if_awake(struct intel_gt *gt) return intel_wakeref_get_if_active(&gt->wakeref); }

+static inline void intel_gt_pm_might_get(struct intel_gt *gt) +{ + intel_wakeref_might_get(&gt->wakeref); +} + static inline void intel_gt_pm_put(struct intel_gt *gt) { intel_wakeref_put(&gt->wakeref); @@ -41,6 +46,11 @@ static inline void intel_gt_pm_put_async(struct intel_gt *gt) intel_wakeref_put_async(&gt->wakeref); }

+static inline void intel_gt_pm_might_put(struct intel_gt *gt) +{ + intel_wakeref_might_put(&gt->wakeref); +} + #define with_intel_gt_pm(gt, tmp) \ for (tmp = 1, intel_gt_pm_get(gt); tmp; \ intel_gt_pm_put(gt), tmp = 0) diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c index 5c53428032b5..795cc071d05d 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -1571,7 +1571,12 @@ static int guc_context_pre_pin(struct intel_context *ce,

static int guc_context_pin(struct intel_context *ce, void *vaddr) { - return __guc_context_pin(ce, ce->engine, vaddr); + int ret = __guc_context_pin(ce, ce->engine, vaddr); + + if (likely(!ret && !intel_context_is_barrier(ce))) + intel_engine_pm_get(ce->engine); + + return ret; }

static void guc_context_unpin(struct intel_context *ce) @@ -1580,6 +1585,9 @@ static void guc_context_unpin(struct intel_context *ce)

unpin_guc_id(guc, ce); lrc_unpin(ce); + + if (likely(!intel_context_is_barrier(ce))) + intel_engine_pm_put_async(ce->engine); }

static void guc_context_post_unpin(struct intel_context *ce) @@ -2341,8 +2349,30 @@ static int guc_virtual_context_pre_pin(struct intel_context *ce, static int guc_virtual_context_pin(struct intel_context *ce, void *vaddr) { struct intel_engine_cs *engine = guc_virtual_get_sibling(ce->engine, 0); + int ret = __guc_context_pin(ce, engine, vaddr); + intel_engine_mask_t tmp, mask = ce->engine->mask; + + if (likely(!ret)) + for_each_engine_masked(engine, ce->engine->gt, mask, tmp) + intel_engine_pm_get(engine);

- return __guc_context_pin(ce, engine, vaddr); + return ret; +} + +static void guc_virtual_context_unpin(struct intel_context *ce) +{ + intel_engine_mask_t tmp, mask = ce->engine->mask; + struct intel_engine_cs *engine; + struct intel_guc *guc = ce_to_guc(ce); + + GEM_BUG_ON(context_enabled(ce)); + GEM_BUG_ON(intel_context_is_barrier(ce)); + + unpin_guc_id(guc, ce); + lrc_unpin(ce); + + for_each_engine_masked(engine, ce->engine->gt, mask, tmp) + intel_engine_pm_put_async(engine); }

static void guc_virtual_context_enter(struct intel_context *ce) @@ -2379,7 +2409,7 @@ static const struct intel_context_ops virtual_guc_context_ops = {

.pre_pin = guc_virtual_context_pre_pin, .pin = guc_virtual_context_pin, - .unpin = guc_context_unpin, + .unpin = guc_virtual_context_unpin, .post_unpin = guc_context_post_unpin,

.ban = guc_context_ban, diff --git a/drivers/gpu/drm/i915/intel_wakeref.h b/drivers/gpu/drm/i915/intel_wakeref.h index 545c8f277c46..4f4c2e15e736 100644 --- a/drivers/gpu/drm/i915/intel_wakeref.h +++ b/drivers/gpu/drm/i915/intel_wakeref.h @@ -123,6 +123,12 @@ enum { __INTEL_WAKEREF_PUT_LAST_BIT__ };

+static inline void +intel_wakeref_might_get(struct intel_wakeref *wf) +{ + might_lock(&wf->mutex); +} + /** * intel_wakeref_put_flags: Release the wakeref * @wf: the wakeref @@ -170,6 +176,12 @@ intel_wakeref_put_delay(struct intel_wakeref *wf, unsigned long delay) FIELD_PREP(INTEL_WAKEREF_PUT_DELAY, delay)); }

+static inline void +intel_wakeref_might_put(struct intel_wakeref *wf) +{ + might_lock(&wf->mutex); +} + /** * intel_wakeref_lock: Lock the wakeref (mutex) * @wf: the wakeref

Add logical engine mapping. This is required for split-frame, as workloads need to be placed on engines in a logically contiguous manner.

v2: (Daniel Vetter) - Add kernel doc for new fields v3: (Tvrtko) - Update comment for new logical_mask field v4: (John Harrison) - Update comment for new logical_mask field

Signed-off-by: Matthew Brost matthew.brost@intel.com Reviewed-by: John Harrison John.C.Harrison@Intel.com --- drivers/gpu/drm/i915/gt/intel_engine_cs.c | 60 ++++++++++++++++--- drivers/gpu/drm/i915/gt/intel_engine_types.h | 7 +++ .../drm/i915/gt/intel_execlists_submission.c | 1 + drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c | 2 +- .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 21 +------ 5 files changed, 62 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c index 2ae57e4656a3..2eb798ad068b 100644 --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c @@ -290,7 +290,8 @@ static void nop_irq_handler(struct intel_engine_cs *engine, u16 iir) GEM_DEBUG_WARN_ON(iir); }

-static int intel_engine_setup(struct intel_gt *gt, enum intel_engine_id id) +static int intel_engine_setup(struct intel_gt *gt, enum intel_engine_id id, + u8 logical_instance) { const struct engine_info *info = &intel_engines[id]; struct drm_i915_private *i915 = gt->i915; @@ -335,6 +336,7 @@ static int intel_engine_setup(struct intel_gt *gt, enum intel_engine_id id)

engine->class = info->class; engine->instance = info->instance; + engine->logical_mask = BIT(logical_instance); __sprint_engine_name(engine);

engine->props.heartbeat_interval_ms = @@ -588,6 +590,37 @@ static intel_engine_mask_t init_engine_mask(struct intel_gt *gt) return info->engine_mask; }

+static void populate_logical_ids(struct intel_gt *gt, u8 *logical_ids, + u8 class, const u8 *map, u8 num_instances) +{ + int i, j; + u8 current_logical_id = 0; + + for (j = 0; j < num_instances; ++j) { + for (i = 0; i < ARRAY_SIZE(intel_engines); ++i) { + if (!HAS_ENGINE(gt, i) || + intel_engines[i].class != class) + continue; + + if (intel_engines[i].instance == map[j]) { + logical_ids[intel_engines[i].instance] = + current_logical_id++; + break; + } + } + } +} + +static void setup_logical_ids(struct intel_gt *gt, u8 *logical_ids, u8 class) +{ + int i; + u8 map[MAX_ENGINE_INSTANCE + 1]; + + for (i = 0; i < MAX_ENGINE_INSTANCE + 1; ++i) + map[i] = i; + populate_logical_ids(gt, logical_ids, class, map, ARRAY_SIZE(map)); +} + /** * intel_engines_init_mmio() - allocate and prepare the Engine Command Streamers * @gt: pointer to struct intel_gt @@ -599,7 +632,8 @@ int intel_engines_init_mmio(struct intel_gt *gt) struct drm_i915_private *i915 = gt->i915; const unsigned int engine_mask = init_engine_mask(gt); unsigned int mask = 0; - unsigned int i; + unsigned int i, class; + u8 logical_ids[MAX_ENGINE_INSTANCE + 1]; int err;

drm_WARN_ON(&i915->drm, engine_mask == 0); @@ -609,15 +643,23 @@ int intel_engines_init_mmio(struct intel_gt *gt) if (i915_inject_probe_failure(i915)) return -ENODEV;

- for (i = 0; i < ARRAY_SIZE(intel_engines); i++) { - if (!HAS_ENGINE(gt, i)) - continue; + for (class = 0; class < MAX_ENGINE_CLASS + 1; ++class) { + setup_logical_ids(gt, logical_ids, class);

- err = intel_engine_setup(gt, i); - if (err) - goto cleanup; + for (i = 0; i < ARRAY_SIZE(intel_engines); ++i) { + u8 instance = intel_engines[i].instance; + + if (intel_engines[i].class != class || + !HAS_ENGINE(gt, i)) + continue;

- mask |= BIT(i); + err = intel_engine_setup(gt, i, + logical_ids[instance]); + if (err) + goto cleanup; + + mask |= BIT(i); + } }

/* diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h index 9167ce52487c..e0f773585c29 100644 --- a/drivers/gpu/drm/i915/gt/intel_engine_types.h +++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h @@ -269,6 +269,13 @@ struct intel_engine_cs { unsigned int guc_id;

intel_engine_mask_t mask; + /** + * @logical_mask: logical mask of engine, reported to user space via + * query IOCTL and used to communicate with the GuC in logical space. + * The logical instance of a physical engine can change based on product + * and fusing. + */ + intel_engine_mask_t logical_mask;

u8 class; u8 instance; diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c index 73a79c2acd3a..43a74b216efb 100644 --- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c +++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c @@ -3877,6 +3877,7 @@ execlists_create_virtual(struct intel_engine_cs **siblings, unsigned int count)

ve->siblings[ve->num_siblings++] = sibling; ve->base.mask |= sibling->mask; + ve->base.logical_mask |= sibling->logical_mask;

/* * All physical engines must be compatible for their emission diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c index 2c6ea64af7ec..621c893a009f 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c @@ -176,7 +176,7 @@ static void guc_mapping_table_init(struct intel_gt *gt, for_each_engine(engine, gt, id) { u8 guc_class = engine_class_to_guc_class(engine->class);

- system_info->mapping_table[guc_class][engine->instance] = + system_info->mapping_table[guc_class][ilog2(engine->logical_mask)] = engine->instance; } } diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c index 795cc071d05d..fd6594bc1b96 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -1423,23 +1423,6 @@ static int deregister_context(struct intel_context *ce, u32 guc_id) return __guc_action_deregister_context(guc, guc_id); }

-static intel_engine_mask_t adjust_engine_mask(u8 class, intel_engine_mask_t mask) -{ - switch (class) { - case RENDER_CLASS: - return mask >> RCS0; - case VIDEO_ENHANCEMENT_CLASS: - return mask >> VECS0; - case VIDEO_DECODE_CLASS: - return mask >> VCS0; - case COPY_ENGINE_CLASS: - return mask >> BCS0; - default: - MISSING_CASE(class); - return 0; - } -} - static void guc_context_policy_init(struct intel_engine_cs *engine, struct guc_lrc_desc *desc) { @@ -1481,8 +1464,7 @@ static int guc_lrc_desc_pin(struct intel_context *ce, bool loop)

desc = __get_lrc_desc(guc, desc_idx); desc->engine_class = engine_class_to_guc_class(engine->class); - desc->engine_submit_mask = adjust_engine_mask(engine->class, - engine->mask); + desc->engine_submit_mask = engine->logical_mask; desc->hw_context_desc = ce->lrc.lrca; desc->priority = ce->guc_state.prio; desc->context_flags = CONTEXT_REGISTRATION_FLAG_KMD; @@ -3271,6 +3253,7 @@ guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count) }

ve->base.mask |= sibling->mask; + ve->base.logical_mask |= sibling->logical_mask;

if (n != 0 && ve->base.class != sibling->class) { DRM_DEBUG("invalid mixing of engine class, sibling %d, already %d\n",

Introduce context parent-child relationship. Once this relationship is created all pinning / unpinning operations are directed to the parent context. The parent context is responsible for pinning all of its children and itself.

This is a precursor to the full GuC multi-lrc implementation but aligns to how GuC mutli-lrc interface is defined - a single H2G is used register / deregister all of the contexts simultaneously.

Subsequent patches in the series will implement the pinning / unpinning operations for parent / child contexts.

v2: (Daniel Vetter) - Add kernel doc, add wrapper to access parent to ensure safety v3: (John Harrison) - Fix comment explaing GEM_BUG_ON in to_parent() - Make variable names generic (non-GuC specific) v4: (John Harrison) - s/its'/its/g

Signed-off-by: Matthew Brost matthew.brost@intel.com Reviewed-by: John Harrison John.C.Harrison@Intel.com --- drivers/gpu/drm/i915/gt/intel_context.c | 29 +++++++++++++ drivers/gpu/drm/i915/gt/intel_context.h | 41 +++++++++++++++++++ drivers/gpu/drm/i915/gt/intel_context_types.h | 21 ++++++++++ 3 files changed, 91 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c index f98c9f470ba1..79f321c6c008 100644 --- a/drivers/gpu/drm/i915/gt/intel_context.c +++ b/drivers/gpu/drm/i915/gt/intel_context.c @@ -404,6 +404,8 @@ intel_context_init(struct intel_context *ce, struct intel_engine_cs *engine)

INIT_LIST_HEAD(&ce->destroyed_link);

+ INIT_LIST_HEAD(&ce->parallel.child_list); + /* * Initialize fence to be complete as this is expected to be complete * unless there is a pending schedule disable outstanding. @@ -418,10 +420,17 @@ intel_context_init(struct intel_context *ce, struct intel_engine_cs *engine)

void intel_context_fini(struct intel_context *ce) { + struct intel_context *child, *next; + if (ce->timeline) intel_timeline_put(ce->timeline); i915_vm_put(ce->vm);

+ /* Need to put the creation ref for the children */ + if (intel_context_is_parent(ce)) + for_each_child_safe(ce, child, next) + intel_context_put(child); + mutex_destroy(&ce->pin_mutex); i915_active_fini(&ce->active); i915_sw_fence_fini(&ce->guc_state.blocked); @@ -538,6 +547,26 @@ struct i915_request *intel_context_find_active_request(struct intel_context *ce) return active; }

+void intel_context_bind_parent_child(struct intel_context *parent, + struct intel_context *child) +{ + /* + * Callers responsibility to validate that this function is used + * correctly but we use GEM_BUG_ON here ensure that they do. + */ + GEM_BUG_ON(!intel_engine_uses_guc(parent->engine)); + GEM_BUG_ON(intel_context_is_pinned(parent)); + GEM_BUG_ON(intel_context_is_child(parent)); + GEM_BUG_ON(intel_context_is_pinned(child)); + GEM_BUG_ON(intel_context_is_child(child)); + GEM_BUG_ON(intel_context_is_parent(child)); + + parent->parallel.number_children++; + list_add_tail(&child->parallel.child_link, + &parent->parallel.child_list); + child->parallel.parent = parent; +} + #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) #include "selftest_context.c" #endif diff --git a/drivers/gpu/drm/i915/gt/intel_context.h b/drivers/gpu/drm/i915/gt/intel_context.h index c41098950746..b63c10a144af 100644 --- a/drivers/gpu/drm/i915/gt/intel_context.h +++ b/drivers/gpu/drm/i915/gt/intel_context.h @@ -44,6 +44,47 @@ void intel_context_free(struct intel_context *ce); int intel_context_reconfigure_sseu(struct intel_context *ce, const struct intel_sseu sseu);

+static inline bool intel_context_is_child(struct intel_context *ce) +{ + return !!ce->parallel.parent; +} + +static inline bool intel_context_is_parent(struct intel_context *ce) +{ + return !!ce->parallel.number_children; +} + +static inline bool intel_context_is_pinned(struct intel_context *ce); + +static inline struct intel_context * +intel_context_to_parent(struct intel_context *ce) +{ + if (intel_context_is_child(ce)) { + /* + * The parent holds ref count to the child so it is always safe + * for the parent to access the child, but the child has a + * pointer to the parent without a ref. To ensure this is safe + * the child should only access the parent pointer while the + * parent is pinned. + */ + GEM_BUG_ON(!intel_context_is_pinned(ce->parallel.parent)); + + return ce->parallel.parent; + } else { + return ce; + } +} + +void intel_context_bind_parent_child(struct intel_context *parent, + struct intel_context *child); + +#define for_each_child(parent, ce)\ + list_for_each_entry(ce, &(parent)->parallel.child_list,\ + parallel.child_link) +#define for_each_child_safe(parent, ce, cn)\ + list_for_each_entry_safe(ce, cn, &(parent)->parallel.child_list,\ + parallel.child_link) + /** * intel_context_lock_pinned - Stablises the 'pinned' status of the HW context * @ce - the context diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h b/drivers/gpu/drm/i915/gt/intel_context_types.h index 4613d027cbc3..76dfca57cb45 100644 --- a/drivers/gpu/drm/i915/gt/intel_context_types.h +++ b/drivers/gpu/drm/i915/gt/intel_context_types.h @@ -220,6 +220,27 @@ struct intel_context { */ struct list_head destroyed_link;

+ /** @parallel: sub-structure for parallel submission members */ + struct { + union { + /** + * @child_list: parent's list of children + * contexts, no protection as immutable after context + * creation + */ + struct list_head child_list; + /** + * @child_link: child's link into parent's list of + * children + */ + struct list_head child_link; + }; + /** @parent: pointer to parent if child */ + struct intel_context *parent; + /** @number_children: number of children if parent */ + u8 number_children; + } parallel; + #ifdef CONFIG_DRM_I915_SELFTEST /** * @drop_schedule_enable: Force drop of schedule enable G2H for selftest

Assign contexts in parent-child relationship consecutive guc_ids. This is accomplished by partitioning guc_id space between ones that need to be consecutive (1/16 available guc_ids) and ones that do not (15/16 of available guc_ids). The consecutive search is implemented via the bitmap API.

This is a precursor to the full GuC multi-lrc implementation but aligns to how GuC mutli-lrc interface is defined - guc_ids must be consecutive when using the GuC multi-lrc interface.

v2: (Daniel Vetter) - Explicitly state why we assign consecutive guc_ids v3: (John Harrison) - Bring back in spin lock

Signed-off-by: Matthew Brost matthew.brost@intel.com Reviewed-by: John Harrison John.C.Harrison@Intel.com --- drivers/gpu/drm/i915/gt/uc/intel_guc.h | 6 +- .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 104 ++++++++++++++---- 2 files changed, 86 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h index 74f071a0b6d5..4ca197f400ba 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h @@ -82,9 +82,13 @@ struct intel_guc { */ spinlock_t lock; /** - * @guc_ids: used to allocate new guc_ids + * @guc_ids: used to allocate new guc_ids, single-lrc */ struct ida guc_ids; + /** + * @guc_ids_bitmap: used to allocate new guc_ids, multi-lrc + */ + unsigned long *guc_ids_bitmap; /** * @guc_id_list: list of intel_context with valid guc_ids but no * refs diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c index fbcf2dc2b2de..7ba4f1d6f69c 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -128,6 +128,16 @@ guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count);

#define GUC_REQUEST_SIZE 64 /* bytes */

+/* + * We reserve 1/16 of the guc_ids for multi-lrc as these need to be contiguous + * per the GuC submission interface. A different allocation algorithm is used + * (bitmap vs. ida) between multi-lrc and single-lrc hence the reason to + * partition the guc_id space. We believe the number of multi-lrc contexts in + * use should be low and 1/16 should be sufficient. Minimum of 32 guc_ids for + * multi-lrc. + */ +#define NUMBER_MULTI_LRC_GUC_ID (GUC_MAX_LRC_DESCRIPTORS / 16) + /* * Below is a set of functions which control the GuC scheduling state which * require a lock. @@ -1207,6 +1217,11 @@ int intel_guc_submission_init(struct intel_guc *guc) INIT_WORK(&guc->submission_state.destroyed_worker, destroyed_worker_func);

+ guc->submission_state.guc_ids_bitmap = + bitmap_zalloc(NUMBER_MULTI_LRC_GUC_ID, GFP_KERNEL); + if (!guc->submission_state.guc_ids_bitmap) + return -ENOMEM; + return 0; }

@@ -1218,6 +1233,7 @@ void intel_guc_submission_fini(struct intel_guc *guc) guc_flush_destroyed_contexts(guc); guc_lrc_desc_pool_destroy(guc); i915_sched_engine_put(guc->sched_engine); + bitmap_free(guc->submission_state.guc_ids_bitmap); }

static inline void queue_request(struct i915_sched_engine *sched_engine, @@ -1269,18 +1285,43 @@ static void guc_submit_request(struct i915_request *rq) spin_unlock_irqrestore(&sched_engine->lock, flags); }

-static int new_guc_id(struct intel_guc *guc) +static int new_guc_id(struct intel_guc *guc, struct intel_context *ce) { - return ida_simple_get(&guc->submission_state.guc_ids, 0, - GUC_MAX_LRC_DESCRIPTORS, GFP_KERNEL | - __GFP_RETRY_MAYFAIL | __GFP_NOWARN); + int ret; + + GEM_BUG_ON(intel_context_is_child(ce)); + + if (intel_context_is_parent(ce)) + ret = bitmap_find_free_region(guc->submission_state.guc_ids_bitmap, + NUMBER_MULTI_LRC_GUC_ID, + order_base_2(ce->parallel.number_children + + 1)); + else + ret = ida_simple_get(&guc->submission_state.guc_ids, + NUMBER_MULTI_LRC_GUC_ID, + GUC_MAX_LRC_DESCRIPTORS, + GFP_KERNEL | __GFP_RETRY_MAYFAIL | + __GFP_NOWARN); + if (unlikely(ret < 0)) + return ret; + + ce->guc_id.id = ret; + return 0; }

static void __release_guc_id(struct intel_guc *guc, struct intel_context *ce) { + GEM_BUG_ON(intel_context_is_child(ce)); + if (!context_guc_id_invalid(ce)) { - ida_simple_remove(&guc->submission_state.guc_ids, - ce->guc_id.id); + if (intel_context_is_parent(ce)) + bitmap_release_region(guc->submission_state.guc_ids_bitmap, + ce->guc_id.id, + order_base_2(ce->parallel.number_children + + 1)); + else + ida_simple_remove(&guc->submission_state.guc_ids, + ce->guc_id.id); reset_lrc_desc(guc, ce->guc_id.id); set_context_guc_id_invalid(ce); } @@ -1297,49 +1338,64 @@ static void release_guc_id(struct intel_guc *guc, struct intel_context *ce) spin_unlock_irqrestore(&guc->submission_state.lock, flags); }

-static int steal_guc_id(struct intel_guc *guc) +static int steal_guc_id(struct intel_guc *guc, struct intel_context *ce) { - struct intel_context *ce; - int guc_id; + struct intel_context *cn;

lockdep_assert_held(&guc->submission_state.lock); + GEM_BUG_ON(intel_context_is_child(ce)); + GEM_BUG_ON(intel_context_is_parent(ce));

if (!list_empty(&guc->submission_state.guc_id_list)) { - ce = list_first_entry(&guc->submission_state.guc_id_list, + cn = list_first_entry(&guc->submission_state.guc_id_list, struct intel_context, guc_id.link);

- GEM_BUG_ON(atomic_read(&ce->guc_id.ref)); - GEM_BUG_ON(context_guc_id_invalid(ce)); + GEM_BUG_ON(atomic_read(&cn->guc_id.ref)); + GEM_BUG_ON(context_guc_id_invalid(cn)); + GEM_BUG_ON(intel_context_is_child(cn)); + GEM_BUG_ON(intel_context_is_parent(cn));

- list_del_init(&ce->guc_id.link); - guc_id = ce->guc_id.id; + list_del_init(&cn->guc_id.link); + ce->guc_id = cn->guc_id;

spin_lock(&ce->guc_state.lock); - clr_context_registered(ce); + clr_context_registered(cn); spin_unlock(&ce->guc_state.lock);

- set_context_guc_id_invalid(ce); - return guc_id; + set_context_guc_id_invalid(cn); + + return 0; } else { return -EAGAIN; } }

-static int assign_guc_id(struct intel_guc *guc, u16 *out) +static int assign_guc_id(struct intel_guc *guc, struct intel_context *ce) { int ret;

lockdep_assert_held(&guc->submission_state.lock); + GEM_BUG_ON(intel_context_is_child(ce));

- ret = new_guc_id(guc); + ret = new_guc_id(guc, ce); if (unlikely(ret < 0)) { - ret = steal_guc_id(guc); + if (intel_context_is_parent(ce)) + return -ENOSPC; + + ret = steal_guc_id(guc, ce); if (ret < 0) return ret; }

- *out = ret; + if (intel_context_is_parent(ce)) { + struct intel_context *child; + int i = 1; + + for_each_child(ce, child) + child->guc_id.id = ce->guc_id.id + i++; + } + return 0; }

@@ -1357,7 +1413,7 @@ static int pin_guc_id(struct intel_guc *guc, struct intel_context *ce) might_lock(&ce->guc_state.lock);

if (context_guc_id_invalid(ce)) { - ret = assign_guc_id(guc, &ce->guc_id.id); + ret = assign_guc_id(guc, ce); if (ret) goto out_unlock; ret = 1; /* Indidcates newly assigned guc_id */ @@ -1399,8 +1455,10 @@ static void unpin_guc_id(struct intel_guc *guc, struct intel_context *ce) unsigned long flags;

GEM_BUG_ON(atomic_read(&ce->guc_id.ref) < 0); + GEM_BUG_ON(intel_context_is_child(ce));

- if (unlikely(context_guc_id_invalid(ce))) + if (unlikely(context_guc_id_invalid(ce) || + intel_context_is_parent(ce))) return;

spin_lock_irqsave(&guc->submission_state.lock, flags);

Implement multi-lrc submission via a single workqueue entry and single H2G. The workqueue entry contains an updated tail value for each request, of all the contexts in the multi-lrc submission, and updates these values simultaneously. As such, the tasklet and bypass path have been updated to coalesce requests into a single submission.

v2: (John Harrison) - s/wqe/wqi - Use FIELD_PREP macros - Add GEM_BUG_ONs ensures length fits within field - Add comment / white space to intel_guc_write_barrier (Kernel test robot) - Make need_tasklet a static function v3: (Docs) - A comment for submission_stall_reason v4: (Kernel test robot) - Initialize return value in bypass tasklt submit function (John Harrison) - Add comment near work queue defs - Add BUILD_BUG_ON to ensure WQ_SIZE is a power of 2 - Update write_barrier comment to talk about work queue v5: (John Harrison) - Fix typo in work queue comment

Reviewed-by: John Harrison John.C.Harrison@Intel.com Signed-off-by: Matthew Brost matthew.brost@intel.com --- drivers/gpu/drm/i915/gt/uc/intel_guc.c | 29 ++ drivers/gpu/drm/i915/gt/uc/intel_guc.h | 11 + drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c | 24 +- drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h | 30 +- .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 323 +++++++++++++++--- drivers/gpu/drm/i915/i915_request.h | 8 + 6 files changed, 350 insertions(+), 75 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc.c index 8f8182bf7c11..6e228343e8cb 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c @@ -756,3 +756,32 @@ void intel_guc_load_status(struct intel_guc *guc, struct drm_printer *p) } } } + +void intel_guc_write_barrier(struct intel_guc *guc) +{ + struct intel_gt *gt = guc_to_gt(guc); + + if (i915_gem_object_is_lmem(guc->ct.vma->obj)) { + /* + * Ensure intel_uncore_write_fw can be used rather than + * intel_uncore_write. + */ + GEM_BUG_ON(guc->send_regs.fw_domains); + + /* + * This register is used by the i915 and GuC for MMIO based + * communication. Once we are in this code CTBs are the only + * method the i915 uses to communicate with the GuC so it is + * safe to write to this register (a value of 0 is NOP for MMIO + * communication). If we ever start mixing CTBs and MMIOs a new + * register will have to be chosen. This function is also used + * to enforce ordering of a work queue item write and an update + * to the process descriptor. When a work queue is being used, + * CTBs are also the only mechanism of communication. + */ + intel_uncore_write_fw(gt->uncore, GEN11_SOFT_SCRATCH(0), 0); + } else { + /* wmb() sufficient for a barrier if in smem */ + wmb(); + } +} diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h index 4ca197f400ba..31cf9fb48c7e 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h @@ -46,6 +46,15 @@ struct intel_guc { * submitted until the stalled request is processed. */ struct i915_request *stalled_request; + /** + * @submission_stall_reason: reason why submission is stalled + */ + enum { + STALL_NONE, + STALL_REGISTER_CONTEXT, + STALL_MOVE_LRC_TAIL, + STALL_ADD_REQUEST, + } submission_stall_reason;

/* intel_guc_recv interrupt related state */ /** @irq_lock: protects GuC irq state */ @@ -367,4 +376,6 @@ void intel_guc_submission_cancel_requests(struct intel_guc *guc);

void intel_guc_load_status(struct intel_guc *guc, struct drm_printer *p);

+void intel_guc_write_barrier(struct intel_guc *guc); + #endif diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c index 0a3504bc0b61..a0cc34be7b56 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c @@ -383,28 +383,6 @@ static u32 ct_get_next_fence(struct intel_guc_ct *ct) return ++ct->requests.last_fence; }

-static void write_barrier(struct intel_guc_ct *ct) -{ - struct intel_guc *guc = ct_to_guc(ct); - struct intel_gt *gt = guc_to_gt(guc); - - if (i915_gem_object_is_lmem(guc->ct.vma->obj)) { - GEM_BUG_ON(guc->send_regs.fw_domains); - /* - * This register is used by the i915 and GuC for MMIO based - * communication. Once we are in this code CTBs are the only - * method the i915 uses to communicate with the GuC so it is - * safe to write to this register (a value of 0 is NOP for MMIO - * communication). If we ever start mixing CTBs and MMIOs a new - * register will have to be chosen. - */ - intel_uncore_write_fw(gt->uncore, GEN11_SOFT_SCRATCH(0), 0); - } else { - /* wmb() sufficient for a barrier if in smem */ - wmb(); - } -} - static int ct_write(struct intel_guc_ct *ct, const u32 *action, u32 len /* in dwords */, @@ -474,7 +452,7 @@ static int ct_write(struct intel_guc_ct *ct, * make sure H2G buffer update and LRC tail update (if this triggering a * submission) are visible before updating the descriptor tail */ - write_barrier(ct); + intel_guc_write_barrier(ct_to_guc(ct));

/* update local copies */ ctb->tail = tail; diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h index 0eeb2a9feeed..18da67cfcd92 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h @@ -52,25 +52,27 @@

#define GUC_DOORBELL_INVALID 256

-/* Work queue item header definitions */ +/* + * Work queue item header definitions + * + * Work queue is circular buffer used to submit complex (multi-lrc) submissions + * to the GuC. A work queue item is an entry in the circular buffer. + */ #define WQ_STATUS_ACTIVE 1 #define WQ_STATUS_SUSPENDED 2 #define WQ_STATUS_CMD_ERROR 3 #define WQ_STATUS_ENGINE_ID_NOT_USED 4 #define WQ_STATUS_SUSPENDED_FROM_RESET 5 -#define WQ_TYPE_SHIFT 0 -#define WQ_TYPE_BATCH_BUF (0x1 << WQ_TYPE_SHIFT) -#define WQ_TYPE_PSEUDO (0x2 << WQ_TYPE_SHIFT) -#define WQ_TYPE_INORDER (0x3 << WQ_TYPE_SHIFT) -#define WQ_TYPE_NOOP (0x4 << WQ_TYPE_SHIFT) -#define WQ_TARGET_SHIFT 10 -#define WQ_LEN_SHIFT 16 -#define WQ_NO_WCFLUSH_WAIT (1 << 27) -#define WQ_PRESENT_WORKLOAD (1 << 28) - -#define WQ_RING_TAIL_SHIFT 20 -#define WQ_RING_TAIL_MAX 0x7FF /* 2^11 QWords */ -#define WQ_RING_TAIL_MASK (WQ_RING_TAIL_MAX << WQ_RING_TAIL_SHIFT) +#define WQ_TYPE_BATCH_BUF 0x1 +#define WQ_TYPE_PSEUDO 0x2 +#define WQ_TYPE_INORDER 0x3 +#define WQ_TYPE_NOOP 0x4 +#define WQ_TYPE_MULTI_LRC 0x5 +#define WQ_TYPE_MASK GENMASK(7, 0) +#define WQ_LEN_MASK GENMASK(26, 16) + +#define WQ_GUC_ID_MASK GENMASK(15, 0) +#define WQ_RING_TAIL_MASK GENMASK(28, 18)

#define GUC_STAGE_DESC_ATTR_ACTIVE BIT(0) #define GUC_STAGE_DESC_ATTR_PENDING_DB BIT(1) diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c index a412593342db..71ae5eb69849 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -400,6 +400,29 @@ __get_process_desc(struct intel_context *ce) LRC_STATE_OFFSET) / sizeof(u32))); }

+static u32 *get_wq_pointer(struct guc_process_desc *desc, + struct intel_context *ce, + u32 wqi_size) +{ + /* + * Check for space in work queue. Caching a value of head pointer in + * intel_context structure in order reduce the number accesses to shared + * GPU memory which may be across a PCIe bus. + */ +#define AVAILABLE_SPACE \ + CIRC_SPACE(ce->parallel.guc.wqi_tail, ce->parallel.guc.wqi_head, WQ_SIZE) + if (wqi_size > AVAILABLE_SPACE) { + ce->parallel.guc.wqi_head = READ_ONCE(desc->head); + + if (wqi_size > AVAILABLE_SPACE) + return NULL; + } +#undef AVAILABLE_SPACE + + return ((u32 *)__get_process_desc(ce)) + + ((WQ_OFFSET + ce->parallel.guc.wqi_tail) / sizeof(u32)); +} + static struct guc_lrc_desc *__get_lrc_desc(struct intel_guc *guc, u32 index) { struct guc_lrc_desc *base = guc->lrc_desc_pool_vaddr; @@ -559,10 +582,10 @@ int intel_guc_wait_for_idle(struct intel_guc *guc, long timeout)

static int guc_lrc_desc_pin(struct intel_context *ce, bool loop);

-static int guc_add_request(struct intel_guc *guc, struct i915_request *rq) +static int __guc_add_request(struct intel_guc *guc, struct i915_request *rq) { int err = 0; - struct intel_context *ce = rq->context; + struct intel_context *ce = request_to_scheduling_context(rq); u32 action[3]; int len = 0; u32 g2h_len_dw = 0; @@ -583,26 +606,17 @@ static int guc_add_request(struct intel_guc *guc, struct i915_request *rq) GEM_BUG_ON(!atomic_read(&ce->guc_id.ref)); GEM_BUG_ON(context_guc_id_invalid(ce));

- /* - * Corner case where the GuC firmware was blown away and reloaded while - * this context was pinned. - */ - if (unlikely(!lrc_desc_registered(guc, ce->guc_id.id))) { - err = guc_lrc_desc_pin(ce, false); - if (unlikely(err)) - return err; - } - spin_lock(&ce->guc_state.lock);

/* * The request / context will be run on the hardware when scheduling - * gets enabled in the unblock. + * gets enabled in the unblock. For multi-lrc we still submit the + * context to move the LRC tails. */ - if (unlikely(context_blocked(ce))) + if (unlikely(context_blocked(ce) && !intel_context_is_parent(ce))) goto out;

- enabled = context_enabled(ce); + enabled = context_enabled(ce) || context_blocked(ce);

if (!enabled) { action[len++] = INTEL_GUC_ACTION_SCHED_CONTEXT_MODE_SET; @@ -621,6 +635,18 @@ static int guc_add_request(struct intel_guc *guc, struct i915_request *rq) trace_intel_context_sched_enable(ce); atomic_inc(&guc->outstanding_submission_g2h); set_context_enabled(ce); + + /* + * Without multi-lrc KMD does the submission step (moving the + * lrc tail) so enabling scheduling is sufficient to submit the + * context. This isn't the case in multi-lrc submission as the + * GuC needs to move the tails, hence the need for another H2G + * to submit a multi-lrc context after enabling scheduling. + */ + if (intel_context_is_parent(ce)) { + action[0] = INTEL_GUC_ACTION_SCHED_CONTEXT; + err = intel_guc_send_nb(guc, action, len - 1, 0); + } } else if (!enabled) { clr_context_pending_enable(ce); intel_context_put(ce); @@ -633,6 +659,18 @@ static int guc_add_request(struct intel_guc *guc, struct i915_request *rq) return err; }

+static int guc_add_request(struct intel_guc *guc, struct i915_request *rq) +{ + int ret = __guc_add_request(guc, rq); + + if (unlikely(ret == -EBUSY)) { + guc->stalled_request = rq; + guc->submission_stall_reason = STALL_ADD_REQUEST; + } + + return ret; +} + static inline void guc_set_lrc_tail(struct i915_request *rq) { rq->context->lrc_reg_state[CTX_RING_TAIL] = @@ -644,6 +682,136 @@ static inline int rq_prio(const struct i915_request *rq) return rq->sched.attr.priority; }

+static bool is_multi_lrc_rq(struct i915_request *rq) +{ + return intel_context_is_child(rq->context) || + intel_context_is_parent(rq->context); +} + +static bool can_merge_rq(struct i915_request *rq, + struct i915_request *last) +{ + return request_to_scheduling_context(rq) == + request_to_scheduling_context(last); +} + +static u32 wq_space_until_wrap(struct intel_context *ce) +{ + return (WQ_SIZE - ce->parallel.guc.wqi_tail); +} + +static void write_wqi(struct guc_process_desc *desc, + struct intel_context *ce, + u32 wqi_size) +{ + BUILD_BUG_ON(!is_power_of_2(WQ_SIZE)); + + /* + * Ensure WQI are visible before updating tail + */ + intel_guc_write_barrier(ce_to_guc(ce)); + + ce->parallel.guc.wqi_tail = (ce->parallel.guc.wqi_tail + wqi_size) & + (WQ_SIZE - 1); + WRITE_ONCE(desc->tail, ce->parallel.guc.wqi_tail); +} + +static int guc_wq_noop_append(struct intel_context *ce) +{ + struct guc_process_desc *desc = __get_process_desc(ce); + u32 *wqi = get_wq_pointer(desc, ce, wq_space_until_wrap(ce)); + u32 len_dw = wq_space_until_wrap(ce) / sizeof(u32) - 1; + + if (!wqi) + return -EBUSY; + + GEM_BUG_ON(!FIELD_FIT(WQ_LEN_MASK, len_dw)); + + *wqi = FIELD_PREP(WQ_TYPE_MASK, WQ_TYPE_NOOP) | + FIELD_PREP(WQ_LEN_MASK, len_dw); + ce->parallel.guc.wqi_tail = 0; + + return 0; +} + +static int __guc_wq_item_append(struct i915_request *rq) +{ + struct intel_context *ce = request_to_scheduling_context(rq); + struct intel_context *child; + struct guc_process_desc *desc = __get_process_desc(ce); + unsigned int wqi_size = (ce->parallel.number_children + 4) * + sizeof(u32); + u32 *wqi; + u32 len_dw = (wqi_size / sizeof(u32)) - 1; + int ret; + + /* Ensure context is in correct state updating work queue */ + GEM_BUG_ON(!atomic_read(&ce->guc_id.ref)); + GEM_BUG_ON(context_guc_id_invalid(ce)); + GEM_BUG_ON(context_wait_for_deregister_to_register(ce)); + GEM_BUG_ON(!lrc_desc_registered(ce_to_guc(ce), ce->guc_id.id)); + + /* Insert NOOP if this work queue item will wrap the tail pointer. */ + if (wqi_size > wq_space_until_wrap(ce)) { + ret = guc_wq_noop_append(ce); + if (ret) + return ret; + } + + wqi = get_wq_pointer(desc, ce, wqi_size); + if (!wqi) + return -EBUSY; + + GEM_BUG_ON(!FIELD_FIT(WQ_LEN_MASK, len_dw)); + + *wqi++ = FIELD_PREP(WQ_TYPE_MASK, WQ_TYPE_MULTI_LRC) | + FIELD_PREP(WQ_LEN_MASK, len_dw); + *wqi++ = ce->lrc.lrca; + *wqi++ = FIELD_PREP(WQ_GUC_ID_MASK, ce->guc_id.id) | + FIELD_PREP(WQ_RING_TAIL_MASK, ce->ring->tail / sizeof(u64)); + *wqi++ = 0; /* fence_id */ + for_each_child(ce, child) + *wqi++ = child->ring->tail / sizeof(u64); + + write_wqi(desc, ce, wqi_size); + + return 0; +} + +static int guc_wq_item_append(struct intel_guc *guc, + struct i915_request *rq) +{ + struct intel_context *ce = request_to_scheduling_context(rq); + int ret = 0; + + if (likely(!intel_context_is_banned(ce))) { + ret = __guc_wq_item_append(rq); + + if (unlikely(ret == -EBUSY)) { + guc->stalled_request = rq; + guc->submission_stall_reason = STALL_MOVE_LRC_TAIL; + } + } + + return ret; +} + +static bool multi_lrc_submit(struct i915_request *rq) +{ + struct intel_context *ce = request_to_scheduling_context(rq); + + intel_ring_set_tail(rq->ring, rq->tail); + + /* + * We expect the front end (execbuf IOCTL) to set this flag on the last + * request generated from a multi-BB submission. This indicates to the + * backend (GuC interface) that we should submit this context thus + * submitting all the requests generated in parallel. + */ + return test_bit(I915_FENCE_FLAG_SUBMIT_PARALLEL, &rq->fence.flags) || + intel_context_is_banned(ce); +} + static int guc_dequeue_one_context(struct intel_guc *guc) { struct i915_sched_engine * const sched_engine = guc->sched_engine; @@ -657,7 +825,17 @@ static int guc_dequeue_one_context(struct intel_guc *guc) if (guc->stalled_request) { submit = true; last = guc->stalled_request; - goto resubmit; + + switch (guc->submission_stall_reason) { + case STALL_REGISTER_CONTEXT: + goto register_context; + case STALL_MOVE_LRC_TAIL: + goto move_lrc_tail; + case STALL_ADD_REQUEST: + goto add_request; + default: + MISSING_CASE(guc->submission_stall_reason); + } }

while ((rb = rb_first_cached(&sched_engine->queue))) { @@ -665,8 +843,8 @@ static int guc_dequeue_one_context(struct intel_guc *guc) struct i915_request *rq, *rn;

priolist_for_each_request_consume(rq, rn, p) { - if (last && rq->context != last->context) - goto done; + if (last && !can_merge_rq(rq, last)) + goto register_context;

list_del_init(&rq->sched.link);

@@ -674,33 +852,84 @@ static int guc_dequeue_one_context(struct intel_guc *guc)

trace_i915_request_in(rq, 0); last = rq; - submit = true; + + if (is_multi_lrc_rq(rq)) { + /* + * We need to coalesce all multi-lrc requests in + * a relationship into a single H2G. We are + * guaranteed that all of these requests will be + * submitted sequentially. + */ + if (multi_lrc_submit(rq)) { + submit = true; + goto register_context; + } + } else { + submit = true; + } }

rb_erase_cached(&p->node, &sched_engine->queue); i915_priolist_free(p); } -done: + +register_context: if (submit) { - guc_set_lrc_tail(last); -resubmit: + struct intel_context *ce = request_to_scheduling_context(last); + + if (unlikely(!lrc_desc_registered(guc, ce->guc_id.id) && + !intel_context_is_banned(ce))) { + ret = guc_lrc_desc_pin(ce, false); + if (unlikely(ret == -EPIPE)) { + goto deadlk; + } else if (ret == -EBUSY) { + guc->stalled_request = last; + guc->submission_stall_reason = + STALL_REGISTER_CONTEXT; + goto schedule_tasklet; + } else if (ret != 0) { + GEM_WARN_ON(ret); /* Unexpected */ + goto deadlk; + } + } + +move_lrc_tail: + if (is_multi_lrc_rq(last)) { + ret = guc_wq_item_append(guc, last); + if (ret == -EBUSY) { + goto schedule_tasklet; + } else if (ret != 0) { + GEM_WARN_ON(ret); /* Unexpected */ + goto deadlk; + } + } else { + guc_set_lrc_tail(last); + } + +add_request: ret = guc_add_request(guc, last); - if (unlikely(ret == -EPIPE)) + if (unlikely(ret == -EPIPE)) { + goto deadlk; + } else if (ret == -EBUSY) { + goto schedule_tasklet; + } else if (ret != 0) { + GEM_WARN_ON(ret); /* Unexpected */ goto deadlk; - else if (ret == -EBUSY) { - tasklet_schedule(&sched_engine->tasklet); - guc->stalled_request = last; - return false; } }

guc->stalled_request = NULL; + guc->submission_stall_reason = STALL_NONE; return submit;

deadlk: sched_engine->tasklet.callback = NULL; tasklet_disable_nosync(&sched_engine->tasklet); return false; + +schedule_tasklet: + tasklet_schedule(&sched_engine->tasklet); + return false; }

static void guc_submission_tasklet(struct tasklet_struct *t) @@ -1250,16 +1479,22 @@ static inline void queue_request(struct i915_sched_engine *sched_engine, static int guc_bypass_tasklet_submit(struct intel_guc *guc, struct i915_request *rq) { - int ret; + int ret = 0;

__i915_request_submit(rq);

trace_i915_request_in(rq, 0);

- guc_set_lrc_tail(rq); - ret = guc_add_request(guc, rq); - if (ret == -EBUSY) - guc->stalled_request = rq; + if (is_multi_lrc_rq(rq)) { + if (multi_lrc_submit(rq)) { + ret = guc_wq_item_append(guc, rq); + if (!ret) + ret = guc_add_request(guc, rq); + } + } else { + guc_set_lrc_tail(rq); + ret = guc_add_request(guc, rq); + }

if (unlikely(ret == -EPIPE)) disable_submission(guc); @@ -1267,6 +1502,16 @@ static int guc_bypass_tasklet_submit(struct intel_guc *guc, return ret; }

+static bool need_tasklet(struct intel_guc *guc, struct i915_request *rq) +{ + struct i915_sched_engine *sched_engine = rq->engine->sched_engine; + struct intel_context *ce = request_to_scheduling_context(rq); + + return submission_disabled(guc) || guc->stalled_request || + !i915_sched_engine_is_empty(sched_engine) || + !lrc_desc_registered(guc, ce->guc_id.id); +} + static void guc_submit_request(struct i915_request *rq) { struct i915_sched_engine *sched_engine = rq->engine->sched_engine; @@ -1276,8 +1521,7 @@ static void guc_submit_request(struct i915_request *rq) /* Will be called from irq-context when using foreign fences. */ spin_lock_irqsave(&sched_engine->lock, flags);

- if (submission_disabled(guc) || guc->stalled_request || - !i915_sched_engine_is_empty(sched_engine)) + if (need_tasklet(guc, rq)) queue_request(sched_engine, rq, rq_prio(rq)); else if (guc_bypass_tasklet_submit(guc, rq) == -EBUSY) tasklet_hi_schedule(&sched_engine->tasklet); @@ -2259,9 +2503,10 @@ static inline bool new_guc_prio_higher(u8 old_guc_prio, u8 new_guc_prio)

static void add_to_context(struct i915_request *rq) { - struct intel_context *ce = rq->context; + struct intel_context *ce = request_to_scheduling_context(rq); u8 new_guc_prio = map_i915_prio_to_guc_prio(rq_prio(rq));

+ GEM_BUG_ON(intel_context_is_child(ce)); GEM_BUG_ON(rq->guc_prio == GUC_PRIO_FINI);

spin_lock(&ce->guc_state.lock); @@ -2294,7 +2539,9 @@ static void guc_prio_fini(struct i915_request *rq, struct intel_context *ce)

static void remove_from_context(struct i915_request *rq) { - struct intel_context *ce = rq->context; + struct intel_context *ce = request_to_scheduling_context(rq); + + GEM_BUG_ON(intel_context_is_child(ce));

spin_lock_irq(&ce->guc_state.lock);

@@ -2713,7 +2960,7 @@ static void guc_init_breadcrumbs(struct intel_engine_cs *engine) static void guc_bump_inflight_request_prio(struct i915_request *rq, int prio) { - struct intel_context *ce = rq->context; + struct intel_context *ce = request_to_scheduling_context(rq); u8 new_guc_prio = map_i915_prio_to_guc_prio(prio);

/* Short circuit function */ @@ -2736,7 +2983,7 @@ static void guc_bump_inflight_request_prio(struct i915_request *rq,

static void guc_retire_inflight_request_prio(struct i915_request *rq) { - struct intel_context *ce = rq->context; + struct intel_context *ce = request_to_scheduling_context(rq);

spin_lock(&ce->guc_state.lock); guc_prio_fini(rq, ce); diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h index 7bd9ed20623e..8950785e55d6 100644 --- a/drivers/gpu/drm/i915/i915_request.h +++ b/drivers/gpu/drm/i915/i915_request.h @@ -139,6 +139,14 @@ enum { * the GPU. Here we track such boost requests on a per-request basis. */ I915_FENCE_FLAG_BOOST, + + /* + * I915_FENCE_FLAG_SUBMIT_PARALLEL - request with a context in a + * parent-child relationship (parallel submission, multi-lrc) should + * trigger a submission to the GuC rather than just moving the context + * tail. + */ + I915_FENCE_FLAG_SUBMIT_PARALLEL, };

/**

Update context and full GPU reset to work with multi-lrc. The idea is parent context tracks all the active requests inflight for itself and its children. The parent context owns the reset replaying / canceling requests as needed.

v2: (John Harrison) - Simply loop in find active request - Add comments to find ative request / reset loop v3: (John Harrison) - s/its'/its/g - Fix comment when searching for active request - Reorder if state in __guc_reset_context v4: (Kernel test robot) - Delete ununsed is_multi_lrc function

Reviewed-by: John Harrison John.C.Harrison@Intel.com Signed-off-by: Matthew Brost matthew.brost@intel.com --- drivers/gpu/drm/i915/gt/intel_context.c | 15 ++++- .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 64 +++++++++++++------ 2 files changed, 58 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c index 79f321c6c008..6aab60584ee5 100644 --- a/drivers/gpu/drm/i915/gt/intel_context.c +++ b/drivers/gpu/drm/i915/gt/intel_context.c @@ -529,20 +529,29 @@ struct i915_request *intel_context_create_request(struct intel_context *ce)

struct i915_request *intel_context_find_active_request(struct intel_context *ce) { + struct intel_context *parent = intel_context_to_parent(ce); struct i915_request *rq, *active = NULL; unsigned long flags;

GEM_BUG_ON(!intel_engine_uses_guc(ce->engine));

- spin_lock_irqsave(&ce->guc_state.lock, flags); - list_for_each_entry_reverse(rq, &ce->guc_state.requests, + /* + * We search the parent list to find an active request on the submitted + * context. The parent list contains the requests for all the contexts + * in the relationship so we have to do a compare of each request's + * context. + */ + spin_lock_irqsave(&parent->guc_state.lock, flags); + list_for_each_entry_reverse(rq, &parent->guc_state.requests, sched.link) { + if (rq->context != ce) + continue; if (i915_request_completed(rq)) break;

active = rq; } - spin_unlock_irqrestore(&ce->guc_state.lock, flags); + spin_unlock_irqrestore(&parent->guc_state.lock, flags);

return active; } diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c index ebb64fb50396..112b5e6fe39d 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -1217,10 +1217,15 @@ __unwind_incomplete_requests(struct intel_context *ce)

static void __guc_reset_context(struct intel_context *ce, bool stalled) { + bool local_stalled; struct i915_request *rq; unsigned long flags; u32 head; + int i, number_children = ce->parallel.number_children; bool skip = false; + struct intel_context *parent = ce; + + GEM_BUG_ON(intel_context_is_child(ce));

intel_context_get(ce);

@@ -1246,25 +1251,38 @@ static void __guc_reset_context(struct intel_context *ce, bool stalled) if (unlikely(skip)) goto out_put;

- rq = intel_context_find_active_request(ce); - if (!rq) { - head = ce->ring->tail; - stalled = false; - goto out_replay; - } + /* + * For each context in the relationship find the hanging request + * resetting each context / request as needed + */ + for (i = 0; i < number_children + 1; ++i) { + if (!intel_context_is_pinned(ce)) + goto next_context; + + local_stalled = false; + rq = intel_context_find_active_request(ce); + if (!rq) { + head = ce->ring->tail; + goto out_replay; + }

- if (!i915_request_started(rq)) - stalled = false; + if (i915_request_started(rq)) + local_stalled = true;

- GEM_BUG_ON(i915_active_is_idle(&ce->active)); - head = intel_ring_wrap(ce->ring, rq->head); - __i915_request_reset(rq, stalled); + GEM_BUG_ON(i915_active_is_idle(&ce->active)); + head = intel_ring_wrap(ce->ring, rq->head);

+ __i915_request_reset(rq, local_stalled && stalled); out_replay: - guc_reset_state(ce, head, stalled); - __unwind_incomplete_requests(ce); + guc_reset_state(ce, head, local_stalled && stalled); +next_context: + if (i != number_children) + ce = list_next_entry(ce, parallel.child_link); + } + + __unwind_incomplete_requests(parent); out_put: - intel_context_put(ce); + intel_context_put(parent); }

void intel_guc_submission_reset(struct intel_guc *guc, bool stalled) @@ -1285,7 +1303,8 @@ void intel_guc_submission_reset(struct intel_guc *guc, bool stalled)

xa_unlock(&guc->context_lookup);

- if (intel_context_is_pinned(ce)) + if (intel_context_is_pinned(ce) && + !intel_context_is_child(ce)) __guc_reset_context(ce, stalled);

intel_context_put(ce); @@ -1377,7 +1396,8 @@ void intel_guc_submission_cancel_requests(struct intel_guc *guc)

xa_unlock(&guc->context_lookup);

- if (intel_context_is_pinned(ce)) + if (intel_context_is_pinned(ce) && + !intel_context_is_child(ce)) guc_cancel_context_requests(ce);

intel_context_put(ce); @@ -2070,6 +2090,8 @@ static struct i915_sw_fence *guc_context_block(struct intel_context *ce) u16 guc_id; bool enabled;

+ GEM_BUG_ON(intel_context_is_child(ce)); + spin_lock_irqsave(&ce->guc_state.lock, flags);

incr_context_blocked(ce); @@ -2124,6 +2146,7 @@ static void guc_context_unblock(struct intel_context *ce) bool enable;

GEM_BUG_ON(context_enabled(ce)); + GEM_BUG_ON(intel_context_is_child(ce));

spin_lock_irqsave(&ce->guc_state.lock, flags);

@@ -2150,11 +2173,14 @@ static void guc_context_unblock(struct intel_context *ce) static void guc_context_cancel_request(struct intel_context *ce, struct i915_request *rq) { + struct intel_context *block_context = + request_to_scheduling_context(rq); + if (i915_sw_fence_signaled(&rq->submit)) { struct i915_sw_fence *fence;

intel_context_get(ce); - fence = guc_context_block(ce); + fence = guc_context_block(block_context); i915_sw_fence_wait(fence); if (!i915_request_completed(rq)) { __i915_request_skip(rq); @@ -2168,7 +2194,7 @@ static void guc_context_cancel_request(struct intel_context *ce, */ flush_work(&ce_to_guc(ce)->ct.requests.worker);

- guc_context_unblock(ce); + guc_context_unblock(block_context); intel_context_put(ce); } } @@ -2194,6 +2220,8 @@ static void guc_context_ban(struct intel_context *ce, struct i915_request *rq) intel_wakeref_t wakeref; unsigned long flags;

+ GEM_BUG_ON(intel_context_is_child(ce)); + guc_flush_submissions(guc);

spin_lock_irqsave(&ce->guc_state.lock, flags);

Introduce 'set parallel submit' extension to connect UAPI to GuC multi-lrc interface. Kernel doc in new uAPI should explain it all.

IGT: https://patchwork.freedesktop.org/patch/447008/?series=93071&rev=1 media UMD: https://github.com/intel/media-driver/pull/1252

v2: (Daniel Vetter) - Add IGT link and placeholder for media UMD link v3: (Kernel test robot) - Fix warning in unpin engines call (John Harrison) - Reword a bunch of the kernel doc v4: (John Harrison) - Add comment why perma-pin is done after setting gem context - Update some comments / docs for proto contexts v5: (John Harrison) - Rework perma-pin comment - Add BUG_IN if context is pinned when setting gem context

Cc: Tvrtko Ursulin tvrtko.ursulin@intel.com Signed-off-by: Matthew Brost matthew.brost@intel.com --- drivers/gpu/drm/i915/gem/i915_gem_context.c | 230 +++++++++++++++++- .../gpu/drm/i915/gem/i915_gem_context_types.h | 16 +- drivers/gpu/drm/i915/gt/intel_context_types.h | 9 +- drivers/gpu/drm/i915/gt/intel_engine.h | 12 +- drivers/gpu/drm/i915/gt/intel_engine_cs.c | 6 +- .../drm/i915/gt/intel_execlists_submission.c | 6 +- drivers/gpu/drm/i915/gt/selftest_execlists.c | 12 +- .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 114 ++++++++- include/uapi/drm/i915_drm.h | 131 ++++++++++ 9 files changed, 505 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c index d225d3dd0b40..9a00f11fef46 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c @@ -556,9 +556,150 @@ set_proto_ctx_engines_bond(struct i915_user_extension __user *base, void *data) return 0; }

+static int +set_proto_ctx_engines_parallel_submit(struct i915_user_extension __user *base, + void *data) +{ + struct i915_context_engines_parallel_submit __user *ext = + container_of_user(base, typeof(*ext), base); + const struct set_proto_ctx_engines *set = data; + struct drm_i915_private *i915 = set->i915; + u64 flags; + int err = 0, n, i, j; + u16 slot, width, num_siblings; + struct intel_engine_cs **siblings = NULL; + intel_engine_mask_t prev_mask; + + /* Disabling for now */ + return -ENODEV; + + /* FIXME: This is NIY for execlists */ + if (!(intel_uc_uses_guc_submission(&i915->gt.uc))) + return -ENODEV; + + if (get_user(slot, &ext->engine_index)) + return -EFAULT; + + if (get_user(width, &ext->width)) + return -EFAULT; + + if (get_user(num_siblings, &ext->num_siblings)) + return -EFAULT; + + if (slot >= set->num_engines) { + drm_dbg(&i915->drm, "Invalid placement value, %d >= %d\n", + slot, set->num_engines); + return -EINVAL; + } + + if (set->engines[slot].type != I915_GEM_ENGINE_TYPE_INVALID) { + drm_dbg(&i915->drm, + "Invalid placement[%d], already occupied\n", slot); + return -EINVAL; + } + + if (get_user(flags, &ext->flags)) + return -EFAULT; + + if (flags) { + drm_dbg(&i915->drm, "Unknown flags 0x%02llx", flags); + return -EINVAL; + } + + for (n = 0; n < ARRAY_SIZE(ext->mbz64); n++) { + err = check_user_mbz(&ext->mbz64[n]); + if (err) + return err; + } + + if (width < 2) { + drm_dbg(&i915->drm, "Width (%d) < 2\n", width); + return -EINVAL; + } + + if (num_siblings < 1) { + drm_dbg(&i915->drm, "Number siblings (%d) < 1\n", + num_siblings); + return -EINVAL; + } + + siblings = kmalloc_array(num_siblings * width, + sizeof(*siblings), + GFP_KERNEL); + if (!siblings) + return -ENOMEM; + + /* Create contexts / engines */ + for (i = 0; i < width; ++i) { + intel_engine_mask_t current_mask = 0; + struct i915_engine_class_instance prev_engine; + + for (j = 0; j < num_siblings; ++j) { + struct i915_engine_class_instance ci; + + n = i * num_siblings + j; + if (copy_from_user(&ci, &ext->engines[n], sizeof(ci))) { + err = -EFAULT; + goto out_err; + } + + siblings[n] = + intel_engine_lookup_user(i915, ci.engine_class, + ci.engine_instance); + if (!siblings[n]) { + drm_dbg(&i915->drm, + "Invalid sibling[%d]: { class:%d, inst:%d }\n", + n, ci.engine_class, ci.engine_instance); + err = -EINVAL; + goto out_err; + } + + if (n) { + if (prev_engine.engine_class != + ci.engine_class) { + drm_dbg(&i915->drm, + "Mismatched class %d, %d\n", + prev_engine.engine_class, + ci.engine_class); + err = -EINVAL; + goto out_err; + } + } + + prev_engine = ci; + current_mask |= siblings[n]->logical_mask; + } + + if (i > 0) { + if (current_mask != prev_mask << 1) { + drm_dbg(&i915->drm, + "Non contiguous logical mask 0x%x, 0x%x\n", + prev_mask, current_mask); + err = -EINVAL; + goto out_err; + } + } + prev_mask = current_mask; + } + + set->engines[slot].type = I915_GEM_ENGINE_TYPE_PARALLEL; + set->engines[slot].num_siblings = num_siblings; + set->engines[slot].width = width; + set->engines[slot].siblings = siblings; + + return 0; + +out_err: + kfree(siblings); + + return err; +} + static const i915_user_extension_fn set_proto_ctx_engines_extensions[] = { [I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE] = set_proto_ctx_engines_balance, [I915_CONTEXT_ENGINES_EXT_BOND] = set_proto_ctx_engines_bond, + [I915_CONTEXT_ENGINES_EXT_PARALLEL_SUBMIT] = + set_proto_ctx_engines_parallel_submit, };

static int set_proto_ctx_engines(struct drm_i915_file_private *fpriv, @@ -794,6 +935,7 @@ static int intel_context_set_gem(struct intel_context *ce, GEM_BUG_ON(rcu_access_pointer(ce->gem_context)); RCU_INIT_POINTER(ce->gem_context, ctx);

+ GEM_BUG_ON(intel_context_is_pinned(ce)); ce->ring_size = SZ_16K;

i915_vm_put(ce->vm); @@ -818,6 +960,25 @@ static int intel_context_set_gem(struct intel_context *ce, return ret; }

+static void __unpin_engines(struct i915_gem_engines *e, unsigned int count) +{ + while (count--) { + struct intel_context *ce = e->engines[count], *child; + + if (!ce || !test_bit(CONTEXT_PERMA_PIN, &ce->flags)) + continue; + + for_each_child(ce, child) + intel_context_unpin(child); + intel_context_unpin(ce); + } +} + +static void unpin_engines(struct i915_gem_engines *e) +{ + __unpin_engines(e, e->num_engines); +} + static void __free_engines(struct i915_gem_engines *e, unsigned int count) { while (count--) { @@ -933,6 +1094,40 @@ static struct i915_gem_engines *default_engines(struct i915_gem_context *ctx, return err; }

+static int perma_pin_contexts(struct intel_context *ce) +{ + struct intel_context *child; + int i = 0, j = 0, ret; + + GEM_BUG_ON(!intel_context_is_parent(ce)); + + ret = intel_context_pin(ce); + if (unlikely(ret)) + return ret; + + for_each_child(ce, child) { + ret = intel_context_pin(child); + if (unlikely(ret)) + goto unwind; + ++i; + } + + set_bit(CONTEXT_PERMA_PIN, &ce->flags); + + return 0; + +unwind: + intel_context_unpin(ce); + for_each_child(ce, child) { + if (j++ < i) + intel_context_unpin(child); + else + break; + } + + return ret; +} + static struct i915_gem_engines *user_engines(struct i915_gem_context *ctx, unsigned int num_engines, struct i915_gem_proto_engine *pe) @@ -946,7 +1141,7 @@ static struct i915_gem_engines *user_engines(struct i915_gem_context *ctx, e->num_engines = num_engines;

for (n = 0; n < num_engines; n++) { - struct intel_context *ce; + struct intel_context *ce, *child; int ret;

switch (pe[n].type) { @@ -956,7 +1151,13 @@ static struct i915_gem_engines *user_engines(struct i915_gem_context *ctx,

case I915_GEM_ENGINE_TYPE_BALANCED: ce = intel_engine_create_virtual(pe[n].siblings, - pe[n].num_siblings); + pe[n].num_siblings, 0); + break; + + case I915_GEM_ENGINE_TYPE_PARALLEL: + ce = intel_engine_create_parallel(pe[n].siblings, + pe[n].num_siblings, + pe[n].width); break;

case I915_GEM_ENGINE_TYPE_INVALID: @@ -977,6 +1178,30 @@ static struct i915_gem_engines *user_engines(struct i915_gem_context *ctx, err = ERR_PTR(ret); goto free_engines; } + for_each_child(ce, child) { + ret = intel_context_set_gem(child, ctx, pe->sseu); + if (ret) { + err = ERR_PTR(ret); + goto free_engines; + } + } + + /* + * XXX: Must be done after calling intel_context_set_gem as that + * function changes the ring size. The ring is allocated when + * the context is pinned. If the ring size is changed after + * allocation we have a mismatch of the ring size and will cause + * the context to hang. Presumably with a bit of reordering we + * could move the perma-pin step to the backend function + * intel_engine_create_parallel. + */ + if (pe[n].type == I915_GEM_ENGINE_TYPE_PARALLEL) { + ret = perma_pin_contexts(ce); + if (ret) { + err = ERR_PTR(ret); + goto free_engines; + } + } }

return e; @@ -1219,6 +1444,7 @@ static void context_close(struct i915_gem_context *ctx)

/* Flush any concurrent set_engines() */ mutex_lock(&ctx->engines_mutex); + unpin_engines(__context_engines_static(ctx)); engines_idle_release(ctx, rcu_replace_pointer(ctx->engines, NULL, 1)); i915_gem_context_set_closed(ctx); mutex_unlock(&ctx->engines_mutex); diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h index a627b09c4680..282cdb8a5c5a 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h @@ -78,13 +78,16 @@ enum i915_gem_engine_type {

/** @I915_GEM_ENGINE_TYPE_BALANCED: A load-balanced engine set */ I915_GEM_ENGINE_TYPE_BALANCED, + + /** @I915_GEM_ENGINE_TYPE_PARALLEL: A parallel engine set */ + I915_GEM_ENGINE_TYPE_PARALLEL, };

/** * struct i915_gem_proto_engine - prototype engine * * This struct describes an engine that a context may contain. Engines - * have three types: + * have four types: * * - I915_GEM_ENGINE_TYPE_INVALID: Invalid engines can be created but they * show up as a NULL in i915_gem_engines::engines[i] and any attempt to @@ -97,6 +100,10 @@ enum i915_gem_engine_type { * * - I915_GEM_ENGINE_TYPE_BALANCED: A load-balanced engine set, described * i915_gem_proto_engine::num_siblings and i915_gem_proto_engine::siblings. + * + * - I915_GEM_ENGINE_TYPE_PARALLEL: A parallel submission engine set, described + * i915_gem_proto_engine::width, i915_gem_proto_engine::num_siblings, and + * i915_gem_proto_engine::siblings. */ struct i915_gem_proto_engine { /** @type: Type of this engine */ @@ -105,10 +112,13 @@ struct i915_gem_proto_engine { /** @engine: Engine, for physical */ struct intel_engine_cs *engine;

- /** @num_siblings: Number of balanced siblings */ + /** @num_siblings: Number of balanced or parallel siblings */ unsigned int num_siblings;

- /** @siblings: Balanced siblings */ + /** @width: Width of each sibling */ + unsigned int width; + + /** @siblings: Balanced siblings or num_siblings * width for parallel */ struct intel_engine_cs **siblings;

/** @sseu: Client-set SSEU parameters */ diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h b/drivers/gpu/drm/i915/gt/intel_context_types.h index 8309d1141d0a..1d880303a7e4 100644 --- a/drivers/gpu/drm/i915/gt/intel_context_types.h +++ b/drivers/gpu/drm/i915/gt/intel_context_types.h @@ -55,9 +55,13 @@ struct intel_context_ops { void (*reset)(struct intel_context *ce); void (*destroy)(struct kref *kref);

- /* virtual engine/context interface */ + /* virtual/parallel engine/context interface */ struct intel_context *(*create_virtual)(struct intel_engine_cs **engine, - unsigned int count); + unsigned int count, + unsigned long flags); + struct intel_context *(*create_parallel)(struct intel_engine_cs **engines, + unsigned int num_siblings, + unsigned int width); struct intel_engine_cs *(*get_sibling)(struct intel_engine_cs *engine, unsigned int sibling); }; @@ -113,6 +117,7 @@ struct intel_context { #define CONTEXT_NOPREEMPT 8 #define CONTEXT_LRCA_DIRTY 9 #define CONTEXT_GUC_INIT 10 +#define CONTEXT_PERMA_PIN 11

struct { u64 timeout_us; diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h index d5ac49c0691e..08559ace0ada 100644 --- a/drivers/gpu/drm/i915/gt/intel_engine.h +++ b/drivers/gpu/drm/i915/gt/intel_engine.h @@ -282,9 +282,19 @@ intel_engine_has_preempt_reset(const struct intel_engine_cs *engine) return intel_engine_has_preemption(engine); }

+#define FORCE_VIRTUAL BIT(0) struct intel_context * intel_engine_create_virtual(struct intel_engine_cs **siblings, - unsigned int count); + unsigned int count, unsigned long flags); + +static inline struct intel_context * +intel_engine_create_parallel(struct intel_engine_cs **engines, + unsigned int num_engines, + unsigned int width) +{ + GEM_BUG_ON(!engines[0]->cops->create_parallel); + return engines[0]->cops->create_parallel(engines, num_engines, width); +}

static inline bool intel_virtual_engine_has_heartbeat(const struct intel_engine_cs *engine) diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c index 2eb798ad068b..ff6753ccb129 100644 --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c @@ -1953,16 +1953,16 @@ ktime_t intel_engine_get_busy_time(struct intel_engine_cs *engine, ktime_t *now)

struct intel_context * intel_engine_create_virtual(struct intel_engine_cs **siblings, - unsigned int count) + unsigned int count, unsigned long flags) { if (count == 0) return ERR_PTR(-EINVAL);

- if (count == 1) + if (count == 1 && !(flags & FORCE_VIRTUAL)) return intel_context_create(siblings[0]);

GEM_BUG_ON(!siblings[0]->cops->create_virtual); - return siblings[0]->cops->create_virtual(siblings, count); + return siblings[0]->cops->create_virtual(siblings, count, flags); }

struct i915_request * diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c index 43a74b216efb..bedb80057046 100644 --- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c +++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c @@ -201,7 +201,8 @@ static struct virtual_engine *to_virtual_engine(struct intel_engine_cs *engine) }

static struct intel_context * -execlists_create_virtual(struct intel_engine_cs **siblings, unsigned int count); +execlists_create_virtual(struct intel_engine_cs **siblings, unsigned int count, + unsigned long flags);

static struct i915_request * __active_request(const struct intel_timeline * const tl, @@ -3784,7 +3785,8 @@ static void virtual_submit_request(struct i915_request *rq) }

static struct intel_context * -execlists_create_virtual(struct intel_engine_cs **siblings, unsigned int count) +execlists_create_virtual(struct intel_engine_cs **siblings, unsigned int count, + unsigned long flags) { struct virtual_engine *ve; unsigned int n; diff --git a/drivers/gpu/drm/i915/gt/selftest_execlists.c b/drivers/gpu/drm/i915/gt/selftest_execlists.c index 25a8c4f62b0d..b367ecfa42de 100644 --- a/drivers/gpu/drm/i915/gt/selftest_execlists.c +++ b/drivers/gpu/drm/i915/gt/selftest_execlists.c @@ -3733,7 +3733,7 @@ static int nop_virtual_engine(struct intel_gt *gt, GEM_BUG_ON(!nctx || nctx > ARRAY_SIZE(ve));

for (n = 0; n < nctx; n++) { - ve[n] = intel_engine_create_virtual(siblings, nsibling); + ve[n] = intel_engine_create_virtual(siblings, nsibling, 0); if (IS_ERR(ve[n])) { err = PTR_ERR(ve[n]); nctx = n; @@ -3929,7 +3929,7 @@ static int mask_virtual_engine(struct intel_gt *gt, * restrict it to our desired engine within the virtual engine. */

- ve = intel_engine_create_virtual(siblings, nsibling); + ve = intel_engine_create_virtual(siblings, nsibling, 0); if (IS_ERR(ve)) { err = PTR_ERR(ve); goto out_close; @@ -4060,7 +4060,7 @@ static int slicein_virtual_engine(struct intel_gt *gt, i915_request_add(rq); }

- ce = intel_engine_create_virtual(siblings, nsibling); + ce = intel_engine_create_virtual(siblings, nsibling, 0); if (IS_ERR(ce)) { err = PTR_ERR(ce); goto out; @@ -4112,7 +4112,7 @@ static int sliceout_virtual_engine(struct intel_gt *gt,

/* XXX We do not handle oversubscription and fairness with normal rq */ for (n = 0; n < nsibling; n++) { - ce = intel_engine_create_virtual(siblings, nsibling); + ce = intel_engine_create_virtual(siblings, nsibling, 0); if (IS_ERR(ce)) { err = PTR_ERR(ce); goto out; @@ -4214,7 +4214,7 @@ static int preserved_virtual_engine(struct intel_gt *gt, if (err) goto out_scratch;

- ve = intel_engine_create_virtual(siblings, nsibling); + ve = intel_engine_create_virtual(siblings, nsibling, 0); if (IS_ERR(ve)) { err = PTR_ERR(ve); goto out_scratch; @@ -4354,7 +4354,7 @@ static int reset_virtual_engine(struct intel_gt *gt, if (igt_spinner_init(&spin, gt)) return -ENOMEM;

- ve = intel_engine_create_virtual(siblings, nsibling); + ve = intel_engine_create_virtual(siblings, nsibling, 0); if (IS_ERR(ve)) { err = PTR_ERR(ve); goto out_spin; diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c index 938dc34e8d3a..7c12364a017a 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -124,7 +124,13 @@ struct guc_virtual_engine { };

static struct intel_context * -guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count); +guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count, + unsigned long flags); + +static struct intel_context * +guc_create_parallel(struct intel_engine_cs **engines, + unsigned int num_siblings, + unsigned int width);

#define GUC_REQUEST_SIZE 64 /* bytes */

@@ -2609,6 +2615,7 @@ static const struct intel_context_ops guc_context_ops = { .destroy = guc_context_destroy,

.create_virtual = guc_create_virtual, + .create_parallel = guc_create_parallel, };

static void submit_work_cb(struct irq_work *wrk) @@ -2858,8 +2865,6 @@ static const struct intel_context_ops virtual_guc_context_ops = { .get_sibling = guc_virtual_get_sibling, };

-/* Future patches will use this function */ -__maybe_unused static int guc_parent_context_pin(struct intel_context *ce, void *vaddr) { struct intel_engine_cs *engine = guc_virtual_get_sibling(ce->engine, 0); @@ -2876,8 +2881,6 @@ static int guc_parent_context_pin(struct intel_context *ce, void *vaddr) return __guc_context_pin(ce, engine, vaddr); }

-/* Future patches will use this function */ -__maybe_unused static int guc_child_context_pin(struct intel_context *ce, void *vaddr) { struct intel_engine_cs *engine = guc_virtual_get_sibling(ce->engine, 0); @@ -2889,8 +2892,6 @@ static int guc_child_context_pin(struct intel_context *ce, void *vaddr) return __guc_context_pin(ce, engine, vaddr); }

-/* Future patches will use this function */ -__maybe_unused static void guc_parent_context_unpin(struct intel_context *ce) { struct intel_guc *guc = ce_to_guc(ce); @@ -2906,8 +2907,6 @@ static void guc_parent_context_unpin(struct intel_context *ce) lrc_unpin(ce); }

-/* Future patches will use this function */ -__maybe_unused static void guc_child_context_unpin(struct intel_context *ce) { GEM_BUG_ON(context_enabled(ce)); @@ -2918,8 +2917,6 @@ static void guc_child_context_unpin(struct intel_context *ce) lrc_unpin(ce); }

-/* Future patches will use this function */ -__maybe_unused static void guc_child_context_post_unpin(struct intel_context *ce) { GEM_BUG_ON(!intel_context_is_child(ce)); @@ -2930,6 +2927,98 @@ static void guc_child_context_post_unpin(struct intel_context *ce) intel_context_unpin(ce->parallel.parent); }

+static void guc_child_context_destroy(struct kref *kref) +{ + struct intel_context *ce = container_of(kref, typeof(*ce), ref); + + __guc_context_destroy(ce); +} + +static const struct intel_context_ops virtual_parent_context_ops = { + .alloc = guc_virtual_context_alloc, + + .pre_pin = guc_context_pre_pin, + .pin = guc_parent_context_pin, + .unpin = guc_parent_context_unpin, + .post_unpin = guc_context_post_unpin, + + .ban = guc_context_ban, + + .cancel_request = guc_context_cancel_request, + + .enter = guc_virtual_context_enter, + .exit = guc_virtual_context_exit, + + .sched_disable = guc_context_sched_disable, + + .destroy = guc_context_destroy, + + .get_sibling = guc_virtual_get_sibling, +}; + +static const struct intel_context_ops virtual_child_context_ops = { + .alloc = guc_virtual_context_alloc, + + .pre_pin = guc_context_pre_pin, + .pin = guc_child_context_pin, + .unpin = guc_child_context_unpin, + .post_unpin = guc_child_context_post_unpin, + + .cancel_request = guc_context_cancel_request, + + .enter = guc_virtual_context_enter, + .exit = guc_virtual_context_exit, + + .destroy = guc_child_context_destroy, + + .get_sibling = guc_virtual_get_sibling, +}; + +static struct intel_context * +guc_create_parallel(struct intel_engine_cs **engines, + unsigned int num_siblings, + unsigned int width) +{ + struct intel_engine_cs **siblings = NULL; + struct intel_context *parent = NULL, *ce, *err; + int i, j; + + siblings = kmalloc_array(num_siblings, + sizeof(*siblings), + GFP_KERNEL); + if (!siblings) + return ERR_PTR(-ENOMEM); + + for (i = 0; i < width; ++i) { + for (j = 0; j < num_siblings; ++j) + siblings[j] = engines[i * num_siblings + j]; + + ce = intel_engine_create_virtual(siblings, num_siblings, + FORCE_VIRTUAL); + if (!ce) { + err = ERR_PTR(-ENOMEM); + goto unwind; + } + + if (i == 0) { + parent = ce; + parent->ops = &virtual_parent_context_ops; + } else { + ce->ops = &virtual_child_context_ops; + intel_context_bind_parent_child(parent, ce); + } + } + + kfree(siblings); + return parent; + +unwind: + if (parent) + intel_context_put(parent); + kfree(siblings); + return err; +} + static bool guc_irq_enable_breadcrumbs(struct intel_breadcrumbs *b) { @@ -3756,7 +3845,8 @@ void intel_guc_submission_print_context_info(struct intel_guc *guc, }

static struct intel_context * -guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count) +guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count, + unsigned long flags) { struct guc_virtual_engine *ve; struct intel_guc *guc; diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h index 0179f92e0916..c2a63e1584cb 100644 --- a/include/uapi/drm/i915_drm.h +++ b/include/uapi/drm/i915_drm.h @@ -1824,6 +1824,7 @@ struct drm_i915_gem_context_param { * Extensions: * i915_context_engines_load_balance (I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE) * i915_context_engines_bond (I915_CONTEXT_ENGINES_EXT_BOND) + * i915_context_engines_parallel_submit (I915_CONTEXT_ENGINES_EXT_PARALLEL_SUBMIT) */ #define I915_CONTEXT_PARAM_ENGINES 0xa

@@ -2098,6 +2099,135 @@ struct i915_context_engines_bond { struct i915_engine_class_instance engines[N__]; \ } __attribute__((packed)) name__

+/** + * struct i915_context_engines_parallel_submit - Configure engine for + * parallel submission. + * + * Setup a slot in the context engine map to allow multiple BBs to be submitted + * in a single execbuf IOCTL. Those BBs will then be scheduled to run on the GPU + * in parallel. Multiple hardware contexts are created internally in the i915 to + * run these BBs. Once a slot is configured for N BBs only N BBs can be + * submitted in each execbuf IOCTL and this is implicit behavior e.g. The user + * doesn't tell the execbuf IOCTL there are N BBs, the execbuf IOCTL knows how + * many BBs there are based on the slot's configuration. The N BBs are the last + * N buffer objects or first N if I915_EXEC_BATCH_FIRST is set. + * + * The default placement behavior is to create implicit bonds between each + * context if each context maps to more than 1 physical engine (e.g. context is + * a virtual engine). Also we only allow contexts of same engine class and these + * contexts must be in logically contiguous order. Examples of the placement + * behavior are described below. Lastly, the default is to not allow BBs to be + * preempted mid-batch. Rather insert coordinated preemption points on all + * hardware contexts between each set of BBs. Flags could be added in the future + * to change both of these default behaviors. + * + * Returns -EINVAL if hardware context placement configuration is invalid or if + * the placement configuration isn't supported on the platform / submission + * interface. + * Returns -ENODEV if extension isn't supported on the platform / submission + * interface. + * + * .. code-block:: none + * + * Examples syntax: + * CS[X] = generic engine of same class, logical instance X + * INVALID = I915_ENGINE_CLASS_INVALID, I915_ENGINE_CLASS_INVALID_NONE + * + * Example 1 pseudo code: + * set_engines(INVALID) + * set_parallel(engine_index=0, width=2, num_siblings=1, + * engines=CS[0],CS[1]) + * + * Results in the following valid placement: + * CS[0], CS[1] + * + * Example 2 pseudo code: + * set_engines(INVALID) + * set_parallel(engine_index=0, width=2, num_siblings=2, + * engines=CS[0],CS[2],CS[1],CS[3]) + * + * Results in the following valid placements: + * CS[0], CS[1] + * CS[2], CS[3] + * + * This can be thought of as two virtual engines, each containing two + * engines thereby making a 2D array. However, there are bonds tying the + * entries together and placing restrictions on how they can be scheduled. + * Specifically, the scheduler can choose only vertical columns from the 2D + * array. That is, CS[0] is bonded to CS[1] and CS[2] to CS[3]. So if the + * scheduler wants to submit to CS[0], it must also choose CS[1] and vice + * versa. Same for CS[2] requires also using CS[3]. + * VE[0] = CS[0], CS[2] + * VE[1] = CS[1], CS[3] + * + * Example 3 pseudo code: + * set_engines(INVALID) + * set_parallel(engine_index=0, width=2, num_siblings=2, + * engines=CS[0],CS[1],CS[1],CS[3]) + * + * Results in the following valid and invalid placements: + * CS[0], CS[1] + * CS[1], CS[3] - Not logically contiguous, return -EINVAL + */ +struct i915_context_engines_parallel_submit { + /** + * @base: base user extension. + */ + struct i915_user_extension base; + + /** + * @engine_index: slot for parallel engine + */ + __u16 engine_index; + + /** + * @width: number of contexts per parallel engine or in other words the + * number of batches in each submission + */ + __u16 width; + + /** + * @num_siblings: number of siblings per context or in other words the + * number of possible placements for each submission + */ + __u16 num_siblings; + + /** + * @mbz16: reserved for future use; must be zero + */ + __u16 mbz16; + + /** + * @flags: all undefined flags must be zero, currently not defined flags + */ + __u64 flags; + + /** + * @mbz64: reserved for future use; must be zero + */ + __u64 mbz64[3]; + + /** + * @engines: 2-d array of engine instances to configure parallel engine + * + * length = width (i) * num_siblings (j) + * index = j + i * num_siblings + */ + struct i915_engine_class_instance engines[0]; + +} __packed; + +#define I915_DEFINE_CONTEXT_ENGINES_PARALLEL_SUBMIT(name__, N__) struct { \ + struct i915_user_extension base; \ + __u16 engine_index; \ + __u16 width; \ + __u16 num_siblings; \ + __u16 mbz16; \ + __u64 flags; \ + __u64 mbz64[3]; \ + struct i915_engine_class_instance engines[N__]; \ +} __attribute__((packed)) name__ + /** * DOC: Context Engine Map uAPI * @@ -2157,6 +2287,7 @@ struct i915_context_param_engines { __u64 extensions; /* linked chain of extension blocks, 0 terminates */ #define I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE 0 /* see i915_context_engines_load_balance */ #define I915_CONTEXT_ENGINES_EXT_BOND 1 /* see i915_context_engines_bond */ +#define I915_CONTEXT_ENGINES_EXT_PARALLEL_SUBMIT 2 /* see i915_context_engines_parallel_submit */ struct i915_engine_class_instance engines[0]; } __attribute__((packed));

Update parallel submit doc to point to i915_drm.h

Signed-off-by: Matthew Brost matthew.brost@intel.com Reviewed-by: John Harrison John.C.Harrison@Intel.com --- Documentation/gpu/rfc/i915_parallel_execbuf.h | 122 ------------------ Documentation/gpu/rfc/i915_scheduler.rst | 4 +- 2 files changed, 2 insertions(+), 124 deletions(-) delete mode 100644 Documentation/gpu/rfc/i915_parallel_execbuf.h

diff --git a/Documentation/gpu/rfc/i915_parallel_execbuf.h b/Documentation/gpu/rfc/i915_parallel_execbuf.h deleted file mode 100644 index 8cbe2c4e0172..000000000000 --- a/Documentation/gpu/rfc/i915_parallel_execbuf.h +++ /dev/null @@ -1,122 +0,0 @@ -/* SPDX-License-Identifier: MIT */ -/* - * Copyright © 2021 Intel Corporation - */ - -#define I915_CONTEXT_ENGINES_EXT_PARALLEL_SUBMIT 2 /* see i915_context_engines_parallel_submit */ - -/** - * struct drm_i915_context_engines_parallel_submit - Configure engine for - * parallel submission. - * - * Setup a slot in the context engine map to allow multiple BBs to be submitted - * in a single execbuf IOCTL. Those BBs will then be scheduled to run on the GPU - * in parallel. Multiple hardware contexts are created internally in the i915 - * run these BBs. Once a slot is configured for N BBs only N BBs can be - * submitted in each execbuf IOCTL and this is implicit behavior e.g. The user - * doesn't tell the execbuf IOCTL there are N BBs, the execbuf IOCTL knows how - * many BBs there are based on the slot's configuration. The N BBs are the last - * N buffer objects or first N if I915_EXEC_BATCH_FIRST is set. - * - * The default placement behavior is to create implicit bonds between each - * context if each context maps to more than 1 physical engine (e.g. context is - * a virtual engine). Also we only allow contexts of same engine class and these - * contexts must be in logically contiguous order. Examples of the placement - * behavior described below. Lastly, the default is to not allow BBs to - * preempted mid BB rather insert coordinated preemption on all hardware - * contexts between each set of BBs. Flags may be added in the future to change - * both of these default behaviors. - * - * Returns -EINVAL if hardware context placement configuration is invalid or if - * the placement configuration isn't supported on the platform / submission - * interface. - * Returns -ENODEV if extension isn't supported on the platform / submission - * interface. - * - * .. code-block:: none - * - * Example 1 pseudo code: - * CS[X] = generic engine of same class, logical instance X - * INVALID = I915_ENGINE_CLASS_INVALID, I915_ENGINE_CLASS_INVALID_NONE - * set_engines(INVALID) - * set_parallel(engine_index=0, width=2, num_siblings=1, - * engines=CS[0],CS[1]) - * - * Results in the following valid placement: - * CS[0], CS[1] - * - * Example 2 pseudo code: - * CS[X] = generic engine of same class, logical instance X - * INVALID = I915_ENGINE_CLASS_INVALID, I915_ENGINE_CLASS_INVALID_NONE - * set_engines(INVALID) - * set_parallel(engine_index=0, width=2, num_siblings=2, - * engines=CS[0],CS[2],CS[1],CS[3]) - * - * Results in the following valid placements: - * CS[0], CS[1] - * CS[2], CS[3] - * - * This can also be thought of as 2 virtual engines described by 2-D array - * in the engines the field with bonds placed between each index of the - * virtual engines. e.g. CS[0] is bonded to CS[1], CS[2] is bonded to - * CS[3]. - * VE[0] = CS[0], CS[2] - * VE[1] = CS[1], CS[3] - * - * Example 3 pseudo code: - * CS[X] = generic engine of same class, logical instance X - * INVALID = I915_ENGINE_CLASS_INVALID, I915_ENGINE_CLASS_INVALID_NONE - * set_engines(INVALID) - * set_parallel(engine_index=0, width=2, num_siblings=2, - * engines=CS[0],CS[1],CS[1],CS[3]) - * - * Results in the following valid and invalid placements: - * CS[0], CS[1] - * CS[1], CS[3] - Not logical contiguous, return -EINVAL - */ -struct drm_i915_context_engines_parallel_submit { - /** - * @base: base user extension. - */ - struct i915_user_extension base; - - /** - * @engine_index: slot for parallel engine - */ - __u16 engine_index; - - /** - * @width: number of contexts per parallel engine - */ - __u16 width; - - /** - * @num_siblings: number of siblings per context - */ - __u16 num_siblings; - - /** - * @mbz16: reserved for future use; must be zero - */ - __u16 mbz16; - - /** - * @flags: all undefined flags must be zero, currently not defined flags - */ - __u64 flags; - - /** - * @mbz64: reserved for future use; must be zero - */ - __u64 mbz64[3]; - - /** - * @engines: 2-d array of engine instances to configure parallel engine - * - * length = width (i) * num_siblings (j) - * index = j + i * num_siblings - */ - struct i915_engine_class_instance engines[0]; - -} __packed; - diff --git a/Documentation/gpu/rfc/i915_scheduler.rst b/Documentation/gpu/rfc/i915_scheduler.rst index cbda75065dad..d630f15ab795 100644 --- a/Documentation/gpu/rfc/i915_scheduler.rst +++ b/Documentation/gpu/rfc/i915_scheduler.rst @@ -135,8 +135,8 @@ Add I915_CONTEXT_ENGINES_EXT_PARALLEL_SUBMIT and drm_i915_context_engines_parallel_submit to the uAPI to implement this extension.

-.. kernel-doc:: Documentation/gpu/rfc/i915_parallel_execbuf.h - :functions: drm_i915_context_engines_parallel_submit +.. kernel-doc:: include/uapi/drm/i915_drm.h + :functions: i915_context_engines_parallel_submit

Extend execbuf2 IOCTL to support submitting N BBs in a single IOCTL -------------------------------------------------------------------

For some users of multi-lrc, e.g. split frame, it isn't safe to preempt mid BB. To safely enable preemption at the BB boundary, a handshake between parent and child is needed, syncing the set of BBs at the beginning and end of each batch. This is implemented via custom emit_bb_start & emit_fini_breadcrumb functions and enabled by default if a context is configured by set parallel extension.

Lastly, this patch updates the process descriptor to the correct size as the memory used in the handshake is directly after the process descriptor.

v2: (John Harrison) - Fix a few comments wording - Add struture for parent page layout v3: (John Harrison) - A structure for sync semaphore - Use offsetof to calc address - Update commit message v4: (John Harrison) - Fix typos in comment explaining memory map of scratch page

Signed-off-by: Matthew Brost matthew.brost@intel.com Reviewed-by: John Harrison John.C.Harrison@Intel.com --- drivers/gpu/drm/i915/gt/intel_context.c | 2 +- drivers/gpu/drm/i915/gt/intel_context_types.h | 2 + drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h | 2 +- .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 333 +++++++++++++++++- 4 files changed, 326 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c index 6aab60584ee5..5634d14052bc 100644 --- a/drivers/gpu/drm/i915/gt/intel_context.c +++ b/drivers/gpu/drm/i915/gt/intel_context.c @@ -570,7 +570,7 @@ void intel_context_bind_parent_child(struct intel_context *parent, GEM_BUG_ON(intel_context_is_child(child)); GEM_BUG_ON(intel_context_is_parent(child));

- parent->parallel.number_children++; + parent->parallel.child_index = parent->parallel.number_children++; list_add_tail(&child->parallel.child_link, &parent->parallel.child_list); child->parallel.parent = parent; diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h b/drivers/gpu/drm/i915/gt/intel_context_types.h index 1d880303a7e4..95a5b94b4ece 100644 --- a/drivers/gpu/drm/i915/gt/intel_context_types.h +++ b/drivers/gpu/drm/i915/gt/intel_context_types.h @@ -250,6 +250,8 @@ struct intel_context { struct i915_request *last_rq; /** @number_children: number of children if parent */ u8 number_children; + /** @child_index: index into child_list if child */ + u8 child_index; /** @guc: GuC specific members for parallel submission */ struct { /** @wqi_head: head pointer in work queue */ diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h index 18da67cfcd92..722933e26347 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h @@ -186,7 +186,7 @@ struct guc_process_desc { u32 wq_status; u32 engine_presence; u32 priority; - u32 reserved[30]; + u32 reserved[36]; } __packed;

#define CONTEXT_REGISTRATION_FLAG_KMD BIT(0) diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c index 57eb5f8bc8bb..50f0f4eba03b 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -11,6 +11,7 @@ #include "gt/intel_context.h" #include "gt/intel_engine_pm.h" #include "gt/intel_engine_heartbeat.h" +#include "gt/intel_gpu_commands.h" #include "gt/intel_gt.h" #include "gt/intel_gt_irq.h" #include "gt/intel_gt_pm.h" @@ -368,11 +369,16 @@ static inline struct i915_priolist *to_priolist(struct rb_node *rb)

/* * When using multi-lrc submission a scratch memory area is reserved in the - * parent's context state for the process descriptor and work queue. Currently - * the scratch area is sized to a page. + * parent's context state for the process descriptor, work queue, and handshake + * between the parent + children contexts to insert safe preemption points + * between each of the BBs. Currently the scratch area is sized to a page. * * The layout of this scratch area is below: * 0 guc_process_desc + * + sizeof(struct guc_process_desc) child go + * + CACHELINE_BYTES child join[0] + * ... + * + CACHELINE_BYTES child join[n - 1] * ... unused * PARENT_SCRATCH_SIZE / 2 work queue start * ... work queue @@ -380,7 +386,25 @@ static inline struct i915_priolist *to_priolist(struct rb_node *rb) */ #define WQ_SIZE (PARENT_SCRATCH_SIZE / 2) #define WQ_OFFSET (PARENT_SCRATCH_SIZE - WQ_SIZE) -static u32 __get_process_desc_offset(struct intel_context *ce) + +struct sync_semaphore { + u32 semaphore; + u8 unused[CACHELINE_BYTES - sizeof(u32)]; +}; + +struct parent_scratch { + struct guc_process_desc pdesc; + + struct sync_semaphore go; + struct sync_semaphore join[MAX_ENGINE_INSTANCE + 1]; + + u8 unused[WQ_OFFSET - sizeof(struct guc_process_desc) - + sizeof(struct sync_semaphore) * (MAX_ENGINE_INSTANCE + 2)]; + + u32 wq[WQ_SIZE / sizeof(u32)]; +}; + +static u32 __get_parent_scratch_offset(struct intel_context *ce) { GEM_BUG_ON(!ce->parallel.guc.parent_page);

@@ -389,23 +413,36 @@ static u32 __get_process_desc_offset(struct intel_context *ce)

static u32 __get_wq_offset(struct intel_context *ce) { - return __get_process_desc_offset(ce) + WQ_OFFSET; + BUILD_BUG_ON(offsetof(struct parent_scratch, wq) != WQ_OFFSET); + + return __get_parent_scratch_offset(ce) + WQ_OFFSET; }

-static struct guc_process_desc * -__get_process_desc(struct intel_context *ce) +static struct parent_scratch * +__get_parent_scratch(struct intel_context *ce) { + BUILD_BUG_ON(sizeof(struct parent_scratch) != PARENT_SCRATCH_SIZE); + BUILD_BUG_ON(sizeof(struct sync_semaphore) != CACHELINE_BYTES); + /* * Need to subtract LRC_STATE_OFFSET here as the * parallel.guc.parent_page is the offset into ce->state while * ce->lrc_reg_reg is ce->state + LRC_STATE_OFFSET. */ - return (struct guc_process_desc *) + return (struct parent_scratch *) (ce->lrc_reg_state + - ((__get_process_desc_offset(ce) - + ((__get_parent_scratch_offset(ce) - LRC_STATE_OFFSET) / sizeof(u32))); }

+static struct guc_process_desc * +__get_process_desc(struct intel_context *ce) +{ + struct parent_scratch *ps = __get_parent_scratch(ce); + + return &ps->pdesc; +} + static u32 *get_wq_pointer(struct guc_process_desc *desc, struct intel_context *ce, u32 wqi_size) @@ -425,8 +462,7 @@ static u32 *get_wq_pointer(struct guc_process_desc *desc, } #undef AVAILABLE_SPACE

- return ((u32 *)__get_process_desc(ce)) + - ((WQ_OFFSET + ce->parallel.guc.wqi_tail) / sizeof(u32)); + return &__get_parent_scratch(ce)->wq[ce->parallel.guc.wqi_tail / sizeof(u32)]; }

static struct guc_lrc_desc *__get_lrc_desc(struct intel_guc *guc, u32 index) @@ -1827,6 +1863,27 @@ static int deregister_context(struct intel_context *ce, u32 guc_id) return __guc_action_deregister_context(guc, guc_id); }

+static inline void clear_children_join_go_memory(struct intel_context *ce) +{ + struct parent_scratch *ps = __get_parent_scratch(ce); + int i; + + ps->go.semaphore = 0; + for (i = 0; i < ce->parallel.number_children + 1; ++i) + ps->join[i].semaphore = 0; +} + +static inline u32 get_children_go_value(struct intel_context *ce) +{ + return __get_parent_scratch(ce)->go.semaphore; +} + +static inline u32 get_children_join_value(struct intel_context *ce, + u8 child_index) +{ + return __get_parent_scratch(ce)->join[child_index].semaphore; +} + static void guc_context_policy_init(struct intel_engine_cs *engine, struct guc_lrc_desc *desc) { @@ -1886,7 +1943,7 @@ static int guc_lrc_desc_pin(struct intel_context *ce, bool loop) ce->parallel.guc.wqi_head = 0;

desc->process_desc = i915_ggtt_offset(ce->state) + - __get_process_desc_offset(ce); + __get_parent_scratch_offset(ce); desc->wq_addr = i915_ggtt_offset(ce->state) + __get_wq_offset(ce); desc->wq_size = WQ_SIZE; @@ -1908,6 +1965,8 @@ static int guc_lrc_desc_pin(struct intel_context *ce, bool loop) desc->context_flags = CONTEXT_REGISTRATION_FLAG_KMD; guc_context_policy_init(engine, desc); } + + clear_children_join_go_memory(ce); }

/* @@ -2974,6 +3033,31 @@ static const struct intel_context_ops virtual_child_context_ops = { .get_sibling = guc_virtual_get_sibling, };

+/* + * The below override of the breadcrumbs is enabled when the user configures a + * context for parallel submission (multi-lrc, parent-child). + * + * The overridden breadcrumbs implements an algorithm which allows the GuC to + * safely preempt all the hw contexts configured for parallel submission + * between each BB. The contract between the i915 and GuC is if the parent + * context can be preempted, all the children can be preempted, and the GuC will + * always try to preempt the parent before the children. A handshake between the + * parent / children breadcrumbs ensures the i915 holds up its end of the deal + * creating a window to preempt between each set of BBs. + */ +static int emit_bb_start_parent_no_preempt_mid_batch(struct i915_request *rq, + u64 offset, u32 len, + const unsigned int flags); +static int emit_bb_start_child_no_preempt_mid_batch(struct i915_request *rq, + u64 offset, u32 len, + const unsigned int flags); +static u32 * +emit_fini_breadcrumb_parent_no_preempt_mid_batch(struct i915_request *rq, + u32 *cs); +static u32 * +emit_fini_breadcrumb_child_no_preempt_mid_batch(struct i915_request *rq, + u32 *cs); + static struct intel_context * guc_create_parallel(struct intel_engine_cs **engines, unsigned int num_siblings, @@ -3009,6 +3093,20 @@ guc_create_parallel(struct intel_engine_cs **engines, } }

+ parent->engine->emit_bb_start = + emit_bb_start_parent_no_preempt_mid_batch; + parent->engine->emit_fini_breadcrumb = + emit_fini_breadcrumb_parent_no_preempt_mid_batch; + parent->engine->emit_fini_breadcrumb_dw = + 12 + 4 * parent->parallel.number_children; + for_each_child(parent, ce) { + ce->engine->emit_bb_start = + emit_bb_start_child_no_preempt_mid_batch; + ce->engine->emit_fini_breadcrumb = + emit_fini_breadcrumb_child_no_preempt_mid_batch; + ce->engine->emit_fini_breadcrumb_dw = 16; + } + kfree(siblings); return parent;

@@ -3837,6 +3935,17 @@ void intel_guc_submission_print_context_info(struct intel_guc *guc, drm_printf(p, "\t\tWQI Status: %u\n\n", READ_ONCE(desc->wq_status));

+ if (ce->engine->emit_bb_start == + emit_bb_start_parent_no_preempt_mid_batch) { + u8 i; + + drm_printf(p, "\t\tChildren Go: %u\n\n", + get_children_go_value(ce)); + for (i = 0; i < ce->parallel.number_children; ++i) + drm_printf(p, "\t\tChildren Join: %u\n", + get_children_join_value(ce, i)); + } + for_each_child(ce, child) guc_log_context(p, child); } @@ -3844,6 +3953,208 @@ void intel_guc_submission_print_context_info(struct intel_guc *guc, xa_unlock_irqrestore(&guc->context_lookup, flags); }

+static inline u32 get_children_go_addr(struct intel_context *ce) +{ + GEM_BUG_ON(!intel_context_is_parent(ce)); + + return i915_ggtt_offset(ce->state) + + __get_parent_scratch_offset(ce) + + offsetof(struct parent_scratch, go.semaphore); +} + +static inline u32 get_children_join_addr(struct intel_context *ce, + u8 child_index) +{ + GEM_BUG_ON(!intel_context_is_parent(ce)); + + return i915_ggtt_offset(ce->state) + + __get_parent_scratch_offset(ce) + + offsetof(struct parent_scratch, join[child_index].semaphore); +} + +#define PARENT_GO_BB 1 +#define PARENT_GO_FINI_BREADCRUMB 0 +#define CHILD_GO_BB 1 +#define CHILD_GO_FINI_BREADCRUMB 0 +static int emit_bb_start_parent_no_preempt_mid_batch(struct i915_request *rq, + u64 offset, u32 len, + const unsigned int flags) +{ + struct intel_context *ce = rq->context; + u32 *cs; + u8 i; + + GEM_BUG_ON(!intel_context_is_parent(ce)); + + cs = intel_ring_begin(rq, 10 + 4 * ce->parallel.number_children); + if (IS_ERR(cs)) + return PTR_ERR(cs); + + /* Wait on children */ + for (i = 0; i < ce->parallel.number_children; ++i) { + *cs++ = (MI_SEMAPHORE_WAIT | + MI_SEMAPHORE_GLOBAL_GTT | + MI_SEMAPHORE_POLL | + MI_SEMAPHORE_SAD_EQ_SDD); + *cs++ = PARENT_GO_BB; + *cs++ = get_children_join_addr(ce, i); + *cs++ = 0; + } + + /* Turn off preemption */ + *cs++ = MI_ARB_ON_OFF | MI_ARB_DISABLE; + *cs++ = MI_NOOP; + + /* Tell children go */ + cs = gen8_emit_ggtt_write(cs, + CHILD_GO_BB, + get_children_go_addr(ce), + 0); + + /* Jump to batch */ + *cs++ = MI_BATCH_BUFFER_START_GEN8 | + (flags & I915_DISPATCH_SECURE ? 0 : BIT(8)); + *cs++ = lower_32_bits(offset); + *cs++ = upper_32_bits(offset); + *cs++ = MI_NOOP; + + intel_ring_advance(rq, cs); + + return 0; +} + +static int emit_bb_start_child_no_preempt_mid_batch(struct i915_request *rq, + u64 offset, u32 len, + const unsigned int flags) +{ + struct intel_context *ce = rq->context; + struct intel_context *parent = intel_context_to_parent(ce); + u32 *cs; + + GEM_BUG_ON(!intel_context_is_child(ce)); + + cs = intel_ring_begin(rq, 12); + if (IS_ERR(cs)) + return PTR_ERR(cs); + + /* Signal parent */ + cs = gen8_emit_ggtt_write(cs, + PARENT_GO_BB, + get_children_join_addr(parent, + ce->parallel.child_index), + 0); + + /* Wait on parent for go */ + *cs++ = (MI_SEMAPHORE_WAIT | + MI_SEMAPHORE_GLOBAL_GTT | + MI_SEMAPHORE_POLL | + MI_SEMAPHORE_SAD_EQ_SDD); + *cs++ = CHILD_GO_BB; + *cs++ = get_children_go_addr(parent); + *cs++ = 0; + + /* Turn off preemption */ + *cs++ = MI_ARB_ON_OFF | MI_ARB_DISABLE; + + /* Jump to batch */ + *cs++ = MI_BATCH_BUFFER_START_GEN8 | + (flags & I915_DISPATCH_SECURE ? 0 : BIT(8)); + *cs++ = lower_32_bits(offset); + *cs++ = upper_32_bits(offset); + + intel_ring_advance(rq, cs); + + return 0; +} + +static u32 * +emit_fini_breadcrumb_parent_no_preempt_mid_batch(struct i915_request *rq, + u32 *cs) +{ + struct intel_context *ce = rq->context; + u8 i; + + GEM_BUG_ON(!intel_context_is_parent(ce)); + + /* Wait on children */ + for (i = 0; i < ce->parallel.number_children; ++i) { + *cs++ = (MI_SEMAPHORE_WAIT | + MI_SEMAPHORE_GLOBAL_GTT | + MI_SEMAPHORE_POLL | + MI_SEMAPHORE_SAD_EQ_SDD); + *cs++ = PARENT_GO_FINI_BREADCRUMB; + *cs++ = get_children_join_addr(ce, i); + *cs++ = 0; + } + + /* Turn on preemption */ + *cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE; + *cs++ = MI_NOOP; + + /* Tell children go */ + cs = gen8_emit_ggtt_write(cs, + CHILD_GO_FINI_BREADCRUMB, + get_children_go_addr(ce), + 0); + + /* Emit fini breadcrumb */ + cs = gen8_emit_ggtt_write(cs, + rq->fence.seqno, + i915_request_active_timeline(rq)->hwsp_offset, + 0); + + /* User interrupt */ + *cs++ = MI_USER_INTERRUPT; + *cs++ = MI_NOOP; + + rq->tail = intel_ring_offset(rq, cs); + + return cs; +} + +static u32 * +emit_fini_breadcrumb_child_no_preempt_mid_batch(struct i915_request *rq, u32 *cs) +{ + struct intel_context *ce = rq->context; + struct intel_context *parent = intel_context_to_parent(ce); + + GEM_BUG_ON(!intel_context_is_child(ce)); + + /* Turn on preemption */ + *cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE; + *cs++ = MI_NOOP; + + /* Signal parent */ + cs = gen8_emit_ggtt_write(cs, + PARENT_GO_FINI_BREADCRUMB, + get_children_join_addr(parent, + ce->parallel.child_index), + 0); + + /* Wait parent on for go */ + *cs++ = (MI_SEMAPHORE_WAIT | + MI_SEMAPHORE_GLOBAL_GTT | + MI_SEMAPHORE_POLL | + MI_SEMAPHORE_SAD_EQ_SDD); + *cs++ = CHILD_GO_FINI_BREADCRUMB; + *cs++ = get_children_go_addr(parent); + *cs++ = 0; + + /* Emit fini breadcrumb */ + cs = gen8_emit_ggtt_write(cs, + rq->fence.seqno, + i915_request_active_timeline(rq)->hwsp_offset, + 0); + + /* User interrupt */ + *cs++ = MI_USER_INTERRUPT; + *cs++ = MI_NOOP; + + rq->tail = intel_ring_offset(rq, cs); + + return cs; +} + static struct intel_context * guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count, unsigned long flags)

If an object in the excl or shared slot is a composite fence from a parallel submit and the current request in the conflict tracking is from the same parallel context there is no need to enforce ordering as the ordering is already implicit. Make the request conflict tracking understand this by comparing a parallel submit's parent context and skipping conflict insertion if the values match.

v2: (John Harrison) - Reword commit message

Signed-off-by: Matthew Brost matthew.brost@intel.com Reviewed-by: John Harrison John.C.Harrison@Intel.com --- drivers/gpu/drm/i915/i915_request.c | 43 +++++++++++++++++++---------- 1 file changed, 29 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c index 8bdf9f2f9b90..820a1f38b271 100644 --- a/drivers/gpu/drm/i915/i915_request.c +++ b/drivers/gpu/drm/i915/i915_request.c @@ -1335,6 +1335,25 @@ i915_request_await_external(struct i915_request *rq, struct dma_fence *fence) return err; }

+static inline bool is_parallel_rq(struct i915_request *rq) +{ + return intel_context_is_parallel(rq->context); +} + +static inline struct intel_context *request_to_parent(struct i915_request *rq) +{ + return intel_context_to_parent(rq->context); +} + +static bool is_same_parallel_context(struct i915_request *to, + struct i915_request *from) +{ + if (is_parallel_rq(to)) + return request_to_parent(to) == request_to_parent(from); + + return false; +} + int i915_request_await_execution(struct i915_request *rq, struct dma_fence *fence) @@ -1366,11 +1385,14 @@ i915_request_await_execution(struct i915_request *rq, * want to run our callback in all cases. */

- if (dma_fence_is_i915(fence)) + if (dma_fence_is_i915(fence)) { + if (is_same_parallel_context(rq, to_request(fence))) + continue; ret = __i915_request_await_execution(rq, to_request(fence)); - else + } else { ret = i915_request_await_external(rq, fence); + } if (ret < 0) return ret; } while (--nchild); @@ -1471,10 +1493,13 @@ i915_request_await_dma_fence(struct i915_request *rq, struct dma_fence *fence) fence)) continue;

- if (dma_fence_is_i915(fence)) + if (dma_fence_is_i915(fence)) { + if (is_same_parallel_context(rq, to_request(fence))) + continue; ret = i915_request_await_request(rq, to_request(fence)); - else + } else { ret = i915_request_await_external(rq, fence); + } if (ret < 0) return ret;

@@ -1525,16 +1550,6 @@ i915_request_await_object(struct i915_request *to, return ret; }

-static inline bool is_parallel_rq(struct i915_request *rq) -{ - return intel_context_is_parallel(rq->context); -} - -static inline struct intel_context *request_to_parent(struct i915_request *rq) -{ - return intel_context_to_parent(rq->context); -} - static struct i915_request * __i915_request_ensure_parallel_ordering(struct i915_request *rq, struct intel_timeline *timeline)

Enable multi-bb execbuf by enabling the set_parallel extension.

Signed-off-by: Matthew Brost matthew.brost@intel.com --- drivers/gpu/drm/i915/gem/i915_gem_context.c | 3 --- 1 file changed, 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c index 9a00f11fef46..fb33d0322960 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c @@ -570,9 +570,6 @@ set_proto_ctx_engines_parallel_submit(struct i915_user_extension __user *base, struct intel_engine_cs **siblings = NULL; intel_engine_mask_t prev_mask;

- /* Disabling for now */ - return -ENODEV; - /* FIXME: This is NIY for execlists */ if (!(intel_uc_uses_guc_submission(&i915->gt.uc))) return -ENODEV;

A weak implementation of parallel submission (multi-bb execbuf IOCTL) for execlists. Doing as little as possible to support this interface for execlists - basically just passing submit fences between each request generated and virtual engines are not allowed. This is on par with what is there for the existing (hopefully soon deprecated) bonding interface.

We perma-pin these execlists contexts to align with GuC implementation.

Signed-off-by: Matthew Brost matthew.brost@intel.com --- drivers/gpu/drm/i915/gem/i915_gem_context.c | 10 ++-- drivers/gpu/drm/i915/gt/intel_context.c | 4 +- .../drm/i915/gt/intel_execlists_submission.c | 56 ++++++++++++++++++- drivers/gpu/drm/i915/gt/intel_lrc.c | 2 + .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 2 - 5 files changed, 64 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c index fb33d0322960..35e87a7d0ea9 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c @@ -570,10 +570,6 @@ set_proto_ctx_engines_parallel_submit(struct i915_user_extension __user *base, struct intel_engine_cs **siblings = NULL; intel_engine_mask_t prev_mask;

- /* FIXME: This is NIY for execlists */ - if (!(intel_uc_uses_guc_submission(&i915->gt.uc))) - return -ENODEV; - if (get_user(slot, &ext->engine_index)) return -EFAULT;

@@ -583,6 +579,12 @@ set_proto_ctx_engines_parallel_submit(struct i915_user_extension __user *base, if (get_user(num_siblings, &ext->num_siblings)) return -EFAULT;

+ if (!intel_uc_uses_guc_submission(&i915->gt.uc) && num_siblings != 1) { + drm_dbg(&i915->drm, "Only 1 sibling (%d) supported in non-GuC mode\n", + num_siblings); + return -EINVAL; + } + if (slot >= set->num_engines) { drm_dbg(&i915->drm, "Invalid placement value, %d >= %d\n", slot, set->num_engines); diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c index 5634d14052bc..1bec92e1d8e6 100644 --- a/drivers/gpu/drm/i915/gt/intel_context.c +++ b/drivers/gpu/drm/i915/gt/intel_context.c @@ -79,7 +79,8 @@ static int intel_context_active_acquire(struct intel_context *ce)

__i915_active_acquire(&ce->active);

- if (intel_context_is_barrier(ce) || intel_engine_uses_guc(ce->engine)) + if (intel_context_is_barrier(ce) || intel_engine_uses_guc(ce->engine) || + intel_context_is_parallel(ce)) return 0;

/* Preallocate tracking nodes */ @@ -563,7 +564,6 @@ void intel_context_bind_parent_child(struct intel_context *parent, * Callers responsibility to validate that this function is used * correctly but we use GEM_BUG_ON here ensure that they do. */ - GEM_BUG_ON(!intel_engine_uses_guc(parent->engine)); GEM_BUG_ON(intel_context_is_pinned(parent)); GEM_BUG_ON(intel_context_is_child(parent)); GEM_BUG_ON(intel_context_is_pinned(child)); diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c index bedb80057046..8cd986bdf26c 100644 --- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c +++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c @@ -927,8 +927,7 @@ static void execlists_submit_ports(struct intel_engine_cs *engine)

static bool ctx_single_port_submission(const struct intel_context *ce) { - return (IS_ENABLED(CONFIG_DRM_I915_GVT) && - intel_context_force_single_submission(ce)); + return intel_context_force_single_submission(ce); }

static bool can_merge_ctx(const struct intel_context *prev, @@ -2598,6 +2597,58 @@ static void execlists_context_cancel_request(struct intel_context *ce, current->comm); }

+static struct intel_context * +execlists_create_parallel(struct intel_engine_cs **engines, + unsigned int num_siblings, + unsigned int width) +{ + struct intel_engine_cs **siblings = NULL; + struct intel_context *parent = NULL, *ce, *err; + int i, j; + + GEM_BUG_ON(num_siblings != 1); + + siblings = kmalloc_array(num_siblings, + sizeof(*siblings), + GFP_KERNEL); + if (!siblings) + return ERR_PTR(-ENOMEM); + + for (i = 0; i < width; ++i) { + for (j = 0; j < num_siblings; ++j) + siblings[j] = engines[i * num_siblings + j]; + + ce = intel_context_create(siblings[0]); + if (!ce) { + err = ERR_PTR(-ENOMEM); + goto unwind; + } + + if (i == 0) + parent = ce; + else + intel_context_bind_parent_child(parent, ce); + } + + parent->parallel.fence_context = dma_fence_context_alloc(1); + + intel_context_set_nopreempt(parent); + intel_context_set_single_submission(parent); + for_each_child(parent, ce) { + intel_context_set_nopreempt(ce); + intel_context_set_single_submission(ce); + } + + kfree(siblings); + return parent; + +unwind: + if (parent) + intel_context_put(parent); + kfree(siblings); + return err; +} + static const struct intel_context_ops execlists_context_ops = { .flags = COPS_HAS_INFLIGHT,

@@ -2616,6 +2667,7 @@ static const struct intel_context_ops execlists_context_ops = { .reset = lrc_reset, .destroy = lrc_destroy,

+ .create_parallel = execlists_create_parallel, .create_virtual = execlists_create_virtual, };

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c index 56156cf18c41..70f4b309522d 100644 --- a/drivers/gpu/drm/i915/gt/intel_lrc.c +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c @@ -1065,6 +1065,8 @@ lrc_pin(struct intel_context *ce,

void lrc_unpin(struct intel_context *ce) { + if (unlikely(ce->parallel.last_rq)) + i915_request_put(ce->parallel.last_rq); check_redzone((void *)ce->lrc_reg_state - LRC_STATE_OFFSET, ce->engine); } diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c index d7710debcd47..145ffe265305 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -2960,8 +2960,6 @@ static void guc_parent_context_unpin(struct intel_context *ce) GEM_BUG_ON(!intel_context_is_parent(ce)); GEM_BUG_ON(!intel_engine_is_virtual(ce->engine));

- if (ce->parallel.last_rq) - i915_request_put(ce->parallel.last_rq); unpin_guc_id(guc, ce); lrc_unpin(ce); }