From: Michal Wajdeczko michal.wajdeczko@intel.com
In irq handler try to receive just single G2H message, let other messages to be received from tasklet.
Signed-off-by: Michal Wajdeczko michal.wajdeczko@intel.com Signed-off-by: Matthew Brost matthew.brost@intel.com Reviewed-by: Matthew Brost matthew.brost@intel.com --- drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c | 67 ++++++++++++++++------- drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h | 3 + 2 files changed, 50 insertions(+), 20 deletions(-)
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 372735c7f5e7..4fac9e4bced4 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c @@ -81,6 +81,7 @@ enum { CTB_SEND = 0, CTB_RECV = 1 };
enum { CTB_OWNER_HOST = 0 };
+static void ct_receive_tasklet_func(struct tasklet_struct *t); static void ct_incoming_request_worker_func(struct work_struct *w);
/** @@ -95,6 +96,7 @@ void intel_guc_ct_init_early(struct intel_guc_ct *ct) INIT_LIST_HEAD(&ct->requests.pending); INIT_LIST_HEAD(&ct->requests.incoming); INIT_WORK(&ct->requests.worker, ct_incoming_request_worker_func); + tasklet_setup(&ct->receive_tasklet, ct_receive_tasklet_func); }
static inline const char *guc_ct_buffer_type_to_str(u32 type) @@ -244,6 +246,7 @@ void intel_guc_ct_fini(struct intel_guc_ct *ct) { GEM_BUG_ON(ct->enabled);
+ tasklet_kill(&ct->receive_tasklet); i915_vma_unpin_and_release(&ct->vma, I915_VMA_RELEASE_MAP); memset(ct, 0, sizeof(*ct)); } @@ -654,7 +657,7 @@ static int ct_read(struct intel_guc_ct *ct, u32 *data) CT_DEBUG(ct, "received %*ph\n", 4 * len, data);
desc->head = head * 4; - return 0; + return available - len;
corrupted: CT_ERROR(ct, "Corrupted descriptor addr=%#x head=%u tail=%u size=%u\n", @@ -690,10 +693,10 @@ static int ct_handle_response(struct intel_guc_ct *ct, const u32 *msg) u32 status; u32 datalen; struct ct_request *req; + unsigned long flags; bool found = false;
GEM_BUG_ON(!ct_header_is_response(header)); - GEM_BUG_ON(!in_irq());
/* Response payload shall at least include fence and status */ if (unlikely(len < 2)) { @@ -713,7 +716,7 @@ static int ct_handle_response(struct intel_guc_ct *ct, const u32 *msg)
CT_DEBUG(ct, "response fence %u status %#x\n", fence, status);
- spin_lock(&ct->requests.lock); + spin_lock_irqsave(&ct->requests.lock, flags); list_for_each_entry(req, &ct->requests.pending, link) { if (unlikely(fence != req->fence)) { CT_DEBUG(ct, "request %u awaits response\n", @@ -732,7 +735,7 @@ static int ct_handle_response(struct intel_guc_ct *ct, const u32 *msg) found = true; break; } - spin_unlock(&ct->requests.lock); + spin_unlock_irqrestore(&ct->requests.lock, flags);
if (!found) CT_ERROR(ct, "Unsolicited response %*ph\n", msgsize, msg); @@ -846,31 +849,55 @@ static int ct_handle_request(struct intel_guc_ct *ct, const u32 *msg) return 0; }
+static int ct_receive(struct intel_guc_ct *ct) +{ + u32 msg[GUC_CT_MSG_LEN_MASK + 1]; /* one extra dw for the header */ + unsigned long flags; + int ret; + + spin_lock_irqsave(&ct->ctbs.recv.lock, flags); + ret = ct_read(ct, msg); + spin_unlock_irqrestore(&ct->ctbs.recv.lock, flags); + if (ret < 0) + return ret; + + if (ct_header_is_response(msg[0])) + ct_handle_response(ct, msg); + else + ct_handle_request(ct, msg); + + return ret; +} + +static void ct_try_receive_message(struct intel_guc_ct *ct) +{ + int ret; + + if (GEM_WARN_ON(!ct->enabled)) + return; + + ret = ct_receive(ct); + if (ret > 0) + tasklet_hi_schedule(&ct->receive_tasklet); +} + +static void ct_receive_tasklet_func(struct tasklet_struct *t) +{ + struct intel_guc_ct *ct = from_tasklet(ct, t, receive_tasklet); + + ct_try_receive_message(ct); +} + /* * When we're communicating with the GuC over CT, GuC uses events * to notify us about new messages being posted on the RECV buffer. */ void intel_guc_ct_event_handler(struct intel_guc_ct *ct) { - u32 msg[GUC_CT_MSG_LEN_MASK + 1]; /* one extra dw for the header */ - unsigned long flags; - int err = 0; - if (unlikely(!ct->enabled)) { WARN(1, "Unexpected GuC event received while CT disabled!\n"); return; }
- do { - spin_lock_irqsave(&ct->ctbs.recv.lock, flags); - err = ct_read(ct, msg); - spin_unlock_irqrestore(&ct->ctbs.recv.lock, flags); - if (err) - break; - - if (ct_header_is_response(msg[0])) - err = ct_handle_response(ct, msg); - else - err = ct_handle_request(ct, msg); - } while (!err); + ct_try_receive_message(ct); } diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h index bc52dc479a14..cb222f202301 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h @@ -6,6 +6,7 @@ #ifndef _INTEL_GUC_CT_H_ #define _INTEL_GUC_CT_H_
+#include <linux/interrupt.h> #include <linux/spinlock.h> #include <linux/workqueue.h>
@@ -55,6 +56,8 @@ struct intel_guc_ct { struct intel_guc_ct_buffer recv; } ctbs;
+ struct tasklet_struct receive_tasklet; + struct { u32 last_fence; /* last fence used to send request */