Just evict unpinned objects to system. For pinned LMEM objects, make a backup system object and blit the contents to that.
Backup is performed in three steps, 1: Opportunistically evict evictable objects using the gpu blitter. 2: After gt idle, evict evictable objects using the gpu blitter. This will be modified in an upcoming patch to backup pinned objects that are not used by the blitter itself. 3: Backup remaining pinned objects using memcpy.
Also move uC suspend to after 2) to make sure we have a functional GuC during 2) if using GuC submission.
v2: - Major refactor to make sure gem_exec_suspend@hang-SX subtests work, and suspend / resume works with a slightly modified GuC submission enabling patch series.
v3: - Fix a potential use-after-free (Matthew Auld) - Use i915_gem_object_create_shmem() instead of i915_gem_object_create_region (Matthew Auld) - Minor simplifications (Matthew Auld) - Fix up kerneldoc for i195_ttm_restore_region(). - Final lmem_suspend() call moved to i915_gem_backup_suspend from i915_gem_suspend_late, since the latter gets called at driver unload and we don't unnecessarily want to run it at that time.
v4: - Interface change of ttm- & lmem suspend / resume functions to use flags rather than bools. (Matthew Auld) - Completely drop the i915_gem_backup_suspend change (Matthew Auld)
Signed-off-by: Thomas Hellström thomas.hellstrom@linux.intel.com Reviewed-by: Matthew Auld matthew.auld@intel.com --- drivers/gpu/drm/i915/Makefile | 1 + .../gpu/drm/i915/gem/i915_gem_object_types.h | 1 + drivers/gpu/drm/i915/gem/i915_gem_pm.c | 87 ++++++++ drivers/gpu/drm/i915/gem/i915_gem_pm.h | 1 + drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 30 ++- drivers/gpu/drm/i915/gem/i915_gem_ttm.h | 10 + drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c | 202 ++++++++++++++++++ drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.h | 26 +++ drivers/gpu/drm/i915/gt/intel_gt_pm.c | 4 +- drivers/gpu/drm/i915/i915_drv.c | 4 +- 10 files changed, 353 insertions(+), 13 deletions(-) create mode 100644 drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c create mode 100644 drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.h
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 335a8c668848..5c8e022a7383 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -154,6 +154,7 @@ gem-y += \ gem/i915_gem_throttle.o \ gem/i915_gem_tiling.o \ gem/i915_gem_ttm.o \ + gem/i915_gem_ttm_pm.o \ gem/i915_gem_userptr.o \ gem/i915_gem_wait.o \ gem/i915_gemfs.o diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h index 2471f36aaff3..734cc8e16481 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h @@ -534,6 +534,7 @@ struct drm_i915_gem_object { struct { struct sg_table *cached_io_st; struct i915_gem_object_page_iter get_io_page; + struct drm_i915_gem_object *backup; bool created:1; } ttm;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pm.c b/drivers/gpu/drm/i915/gem/i915_gem_pm.c index 8b9d7d14c4bd..12b37b4c1192 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_pm.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_pm.c @@ -5,6 +5,7 @@ */
#include "gem/i915_gem_pm.h" +#include "gem/i915_gem_ttm_pm.h" #include "gt/intel_gt.h" #include "gt/intel_gt_pm.h" #include "gt/intel_gt_requests.h" @@ -39,6 +40,84 @@ void i915_gem_suspend(struct drm_i915_private *i915) i915_gem_drain_freed_objects(i915); }
+static int lmem_restore(struct drm_i915_private *i915, u32 flags) +{ + struct intel_memory_region *mr; + int ret = 0, id; + + for_each_memory_region(mr, i915, id) { + if (mr->type == INTEL_MEMORY_LOCAL) { + ret = i915_ttm_restore_region(mr, flags); + if (ret) + break; + } + } + + return ret; +} + +static int lmem_suspend(struct drm_i915_private *i915, u32 flags) +{ + struct intel_memory_region *mr; + int ret = 0, id; + + for_each_memory_region(mr, i915, id) { + if (mr->type == INTEL_MEMORY_LOCAL) { + ret = i915_ttm_backup_region(mr, flags); + if (ret) + break; + } + } + + return ret; +} + +static void lmem_recover(struct drm_i915_private *i915) +{ + struct intel_memory_region *mr; + int id; + + for_each_memory_region(mr, i915, id) + if (mr->type == INTEL_MEMORY_LOCAL) + i915_ttm_recover_region(mr); +} + +int i915_gem_backup_suspend(struct drm_i915_private *i915) +{ + int ret; + + /* Opportunistically try to evict unpinned objects */ + ret = lmem_suspend(i915, I915_TTM_BACKUP_ALLOW_GPU); + if (ret) + goto out_recover; + + i915_gem_suspend(i915); + + /* + * More objects may have become unpinned as requests were + * retired. Now try to evict again. The gt may be wedged here + * in which case we automatically fall back to memcpy. + */ + ret = lmem_suspend(i915, I915_TTM_BACKUP_ALLOW_GPU); + if (ret) + goto out_recover; + + /* + * Remaining objects are backed up using memcpy once we've stopped + * using the migrate context. + */ + ret = lmem_suspend(i915, I915_TTM_BACKUP_PINNED); + if (ret) + goto out_recover; + + return 0; + +out_recover: + lmem_recover(i915); + + return ret; +} + void i915_gem_suspend_late(struct drm_i915_private *i915) { struct drm_i915_gem_object *obj; @@ -128,12 +207,20 @@ int i915_gem_freeze_late(struct drm_i915_private *i915)
void i915_gem_resume(struct drm_i915_private *i915) { + int ret; + GEM_TRACE("%s\n", dev_name(i915->drm.dev));
+ ret = lmem_restore(i915, 0); + GEM_WARN_ON(ret); + /* * As we didn't flush the kernel context before suspend, we cannot * guarantee that the context image is complete. So let's just reset * it and start again. */ intel_gt_resume(&i915->gt); + + ret = lmem_restore(i915, I915_TTM_BACKUP_ALLOW_GPU); + GEM_WARN_ON(ret); } diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pm.h b/drivers/gpu/drm/i915/gem/i915_gem_pm.h index c9a66630e92e..bedf1e95941a 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_pm.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_pm.h @@ -18,6 +18,7 @@ void i915_gem_idle_work_handler(struct work_struct *work);
void i915_gem_suspend(struct drm_i915_private *i915); void i915_gem_suspend_late(struct drm_i915_private *i915); +int i915_gem_backup_suspend(struct drm_i915_private *i915);
int i915_gem_freeze(struct drm_i915_private *i915); int i915_gem_freeze_late(struct drm_i915_private *i915); diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c index 22d59510d0c3..b94497989995 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c @@ -10,18 +10,16 @@ #include "intel_memory_region.h" #include "intel_region_ttm.h"
+#include "gem/i915_gem_mman.h" #include "gem/i915_gem_object.h" #include "gem/i915_gem_region.h" #include "gem/i915_gem_ttm.h" -#include "gem/i915_gem_mman.h" +#include "gem/i915_gem_ttm_pm.h"
-#include "gt/intel_migrate.h" -#include "gt/intel_engine_pm.h"
-#define I915_PL_LMEM0 TTM_PL_PRIV -#define I915_PL_SYSTEM TTM_PL_SYSTEM -#define I915_PL_STOLEN TTM_PL_VRAM -#define I915_PL_GGTT TTM_PL_TT +#include "gt/intel_engine_pm.h" +#include "gt/intel_gt.h" +#include "gt/intel_migrate.h"
#define I915_TTM_PRIO_PURGE 0 #define I915_TTM_PRIO_NO_PAGES 1 @@ -64,6 +62,20 @@ static struct ttm_placement i915_sys_placement = { .busy_placement = &sys_placement_flags, };
+/** + * i915_ttm_sys_placement - Return the struct ttm_placement to be + * used for an object in system memory. + * + * Rather than making the struct extern, use this + * function. + * + * Return: A pointer to a static variable for sys placement. + */ +struct ttm_placement *i915_ttm_sys_placement(void) +{ + return &i915_sys_placement; +} + static int i915_ttm_err_to_gem(int err) { /* Fastpath */ @@ -442,7 +454,7 @@ static int i915_ttm_accel_move(struct ttm_buffer_object *bo, enum i915_cache_level src_level, dst_level; int ret;
- if (!i915->gt.migrate.context) + if (!i915->gt.migrate.context || intel_gt_is_wedged(&i915->gt)) return -EINVAL;
dst_level = i915_ttm_cache_level(i915, dst_mem, dst_ttm); @@ -886,6 +898,8 @@ void i915_ttm_bo_destroy(struct ttm_buffer_object *bo) { struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
+ i915_ttm_backup_free(obj); + /* This releases all gem object bindings to the backend. */ __i915_gem_free_object(obj);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.h b/drivers/gpu/drm/i915/gem/i915_gem_ttm.h index 34ac78d47b0d..0b7291dd897c 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.h @@ -50,4 +50,14 @@ int __i915_gem_ttm_object_init(struct intel_memory_region *mem, int i915_gem_obj_copy_ttm(struct drm_i915_gem_object *dst, struct drm_i915_gem_object *src, bool allow_accel, bool intr); + +/* Internal I915 TTM declarations and definitions below. */ + +#define I915_PL_LMEM0 TTM_PL_PRIV +#define I915_PL_SYSTEM TTM_PL_SYSTEM +#define I915_PL_STOLEN TTM_PL_VRAM +#define I915_PL_GGTT TTM_PL_TT + +struct ttm_placement *i915_ttm_sys_placement(void); + #endif diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c new file mode 100644 index 000000000000..cb1c46724f70 --- /dev/null +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c @@ -0,0 +1,202 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2021 Intel Corporation + */ + +#include <drm/ttm/ttm_placement.h> +#include <drm/ttm/ttm_tt.h> + +#include "i915_drv.h" +#include "intel_memory_region.h" +#include "intel_region_ttm.h" + +#include "gem/i915_gem_region.h" +#include "gem/i915_gem_ttm.h" +#include "gem/i915_gem_ttm_pm.h" + +/** + * i915_ttm_backup_free - Free any backup attached to this object + * @obj: The object whose backup is to be freed. + */ +void i915_ttm_backup_free(struct drm_i915_gem_object *obj) +{ + if (obj->ttm.backup) { + i915_gem_object_put(obj->ttm.backup); + obj->ttm.backup = NULL; + } +} + +/** + * struct i915_gem_ttm_pm_apply - Apply-to-region subclass for restore + * @base: The i915_gem_apply_to_region we derive from. + * @allow_gpu: Whether using the gpu blitter is allowed. + * @backup_pinned: On backup, backup also pinned objects. + */ +struct i915_gem_ttm_pm_apply { + struct i915_gem_apply_to_region base; + bool allow_gpu : 1; + bool backup_pinned : 1; +}; + +static int i915_ttm_backup(struct i915_gem_apply_to_region *apply, + struct drm_i915_gem_object *obj) +{ + struct i915_gem_ttm_pm_apply *pm_apply = + container_of(apply, typeof(*pm_apply), base); + struct ttm_buffer_object *bo = i915_gem_to_ttm(obj); + struct ttm_buffer_object *backup_bo; + struct drm_i915_private *i915 = + container_of(bo->bdev, typeof(*i915), bdev); + struct drm_i915_gem_object *backup; + struct ttm_operation_ctx ctx = {}; + int err = 0; + + if (bo->resource->mem_type == I915_PL_SYSTEM || obj->ttm.backup) + return 0; + + if (pm_apply->allow_gpu && i915_gem_object_evictable(obj)) + return ttm_bo_validate(bo, i915_ttm_sys_placement(), &ctx); + + if (!pm_apply->backup_pinned) + return 0; + + backup = i915_gem_object_create_shmem(i915, obj->base.size); + if (IS_ERR(backup)) + return PTR_ERR(backup); + + err = i915_gem_object_lock(backup, apply->ww); + if (err) + goto out_no_lock; + + backup_bo = i915_gem_to_ttm(backup); + err = ttm_tt_populate(backup_bo->bdev, backup_bo->ttm, &ctx); + if (err) + goto out_no_populate; + + err = i915_gem_obj_copy_ttm(backup, obj, pm_apply->allow_gpu, false); + GEM_WARN_ON(err); + + obj->ttm.backup = backup; + return 0; + +out_no_populate: + i915_gem_ww_unlock_single(backup); +out_no_lock: + i915_gem_object_put(backup); + + return err; +} + +static int i915_ttm_recover(struct i915_gem_apply_to_region *apply, + struct drm_i915_gem_object *obj) +{ + i915_ttm_backup_free(obj); + return 0; +} + +/** + * i915_ttm_recover_region - Free the backup of all objects of a region + * @mr: The memory region + * + * Checks all objects of a region if there is backup attached and if so + * frees that backup. Typically this is called to recover after a partially + * performed backup. + */ +void i915_ttm_recover_region(struct intel_memory_region *mr) +{ + static const struct i915_gem_apply_to_region_ops recover_ops = { + .process_obj = i915_ttm_recover, + }; + struct i915_gem_apply_to_region apply = {.ops = &recover_ops}; + int ret; + + ret = i915_gem_process_region(mr, &apply); + GEM_WARN_ON(ret); +} + +/** + * i915_ttm_backup_region - Back up all objects of a region to smem. + * @mr: The memory region + * @allow_gpu: Whether to allow the gpu blitter for this backup. + * @backup_pinned: Backup also pinned objects. + * + * Loops over all objects of a region and either evicts them if they are + * evictable or backs them up using a backup object if they are pinned. + * + * Return: Zero on success. Negative error code on error. + */ +int i915_ttm_backup_region(struct intel_memory_region *mr, u32 flags) +{ + static const struct i915_gem_apply_to_region_ops backup_ops = { + .process_obj = i915_ttm_backup, + }; + struct i915_gem_ttm_pm_apply pm_apply = { + .base = {.ops = &backup_ops}, + .allow_gpu = flags & I915_TTM_BACKUP_ALLOW_GPU, + .backup_pinned = flags & I915_TTM_BACKUP_PINNED, + }; + + return i915_gem_process_region(mr, &pm_apply.base); +} + +static int i915_ttm_restore(struct i915_gem_apply_to_region *apply, + struct drm_i915_gem_object *obj) +{ + struct i915_gem_ttm_pm_apply *pm_apply = + container_of(apply, typeof(*pm_apply), base); + struct drm_i915_gem_object *backup = obj->ttm.backup; + struct ttm_buffer_object *backup_bo = i915_gem_to_ttm(backup); + struct ttm_operation_ctx ctx = {}; + int err; + + if (!backup) + return 0; + + if (!pm_apply->allow_gpu && (obj->flags & I915_BO_ALLOC_USER)) + return 0; + + err = i915_gem_object_lock(backup, apply->ww); + if (err) + return err; + + /* Content may have been swapped. */ + err = ttm_tt_populate(backup_bo->bdev, backup_bo->ttm, &ctx); + if (!err) { + err = i915_gem_obj_copy_ttm(obj, backup, pm_apply->allow_gpu, + false); + GEM_WARN_ON(err); + + obj->ttm.backup = NULL; + err = 0; + } + + i915_gem_ww_unlock_single(backup); + + if (!err) + i915_gem_object_put(backup); + + return err; +} + +/** + * i915_ttm_restore_region - Restore backed-up objects of a region from smem. + * @mr: The memory region + * @allow_gpu: Whether to allow the gpu blitter to recover. + * + * Loops over all objects of a region and if they are backed-up, restores + * them from smem. + * + * Return: Zero on success. Negative error code on error. + */ +int i915_ttm_restore_region(struct intel_memory_region *mr, u32 flags) +{ + static const struct i915_gem_apply_to_region_ops restore_ops = { + .process_obj = i915_ttm_restore, + }; + struct i915_gem_ttm_pm_apply pm_apply = { + .base = {.ops = &restore_ops}, + .allow_gpu = flags & I915_TTM_BACKUP_ALLOW_GPU, + }; + + return i915_gem_process_region(mr, &pm_apply.base); +} diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.h b/drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.h new file mode 100644 index 000000000000..25ed67a31571 --- /dev/null +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.h @@ -0,0 +1,26 @@ +/* SPDX-License-Identifier: MIT */ +/* + * Copyright © 2021 Intel Corporation + */ + +#ifndef _I915_GEM_TTM_PM_H_ +#define _I915_GEM_TTM_PM_H_ + +#include <linux/types.h> + +struct intel_memory_region; +struct drm_i915_gem_object; + +#define I915_TTM_BACKUP_ALLOW_GPU BIT(0) +#define I915_TTM_BACKUP_PINNED BIT(1) + +int i915_ttm_backup_region(struct intel_memory_region *mr, u32 flags); + +void i915_ttm_recover_region(struct intel_memory_region *mr); + +int i915_ttm_restore_region(struct intel_memory_region *mr, u32 flags); + +/* Internal I915 TTM functions below. */ +void i915_ttm_backup_free(struct drm_i915_gem_object *obj); + +#endif diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c index f84f2bfe2de0..e9da36530b45 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c +++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c @@ -297,8 +297,6 @@ void intel_gt_suspend_prepare(struct intel_gt *gt) { user_forcewake(gt, true); wait_for_suspend(gt); - - intel_uc_suspend(>->uc); }
static suspend_state_t pm_suspend_target(void) @@ -322,6 +320,8 @@ void intel_gt_suspend_late(struct intel_gt *gt)
GEM_BUG_ON(gt->awake);
+ intel_uc_suspend(>->uc); + /* * On disabling the device, we want to turn off HW access to memory * that we no longer own. diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 3cf61bead2f6..ed7b421cad44 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -1094,9 +1094,7 @@ static int i915_drm_prepare(struct drm_device *dev) * split out that work and pull it forward so that after point, * the GPU is not woken again. */ - i915_gem_suspend(i915); - - return 0; + return i915_gem_backup_suspend(i915); }
static int i915_drm_suspend(struct drm_device *dev)