diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c | 206 |
1 files changed, 206 insertions, 0 deletions
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..3b6d14b5c604 --- /dev/null +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c @@ -0,0 +1,206 @@ +// 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 || + (pm_apply->allow_gpu && (obj->flags & I915_BO_ALLOC_PM_EARLY))) + return 0; + + if (obj->flags & I915_BO_ALLOC_PM_VOLATILE) + 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_PM_EARLY)) + 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); +} |