[PATCH 25/26] drm/i915: Add accelerated migration to ttm
Maarten Lankhorst
maarten.lankhorst at linux.intel.com
Fri Oct 1 09:59:03 UTC 2021
Expose the fence to ttm_bo->moving, which will get picked up by i915
through the i915_gem_object_get_moving_fence call. Should be sufficient
for the needs we have.
This only converts i915_ttm_move(), which is the move callback used by
TTM. We could do the same for suspend/resume, and speed that up slightly
by adding the request to resv->excl and bo->moving, and not waiting for
completion.
However, this would need a wait for completion inside the suspend path,
so I think this conversion would need to be done separately.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 133 +++++++++++++-----------
1 file changed, 75 insertions(+), 58 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index 97fe4f05fe9d..538da8c2975b 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -365,10 +365,14 @@ static void i915_ttm_swap_notify(struct ttm_buffer_object *bo)
static void i915_ttm_delete_mem_notify(struct ttm_buffer_object *bo)
{
- struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
+ struct drm_i915_gem_object *obj;
- if (likely(obj))
- i915_ttm_free_cached_io_st(obj);
+ if (bo->destroy != i915_ttm_bo_destroy)
+ return;
+
+ obj = i915_ttm_to_gem(bo);
+
+ i915_ttm_free_cached_io_st(obj);
}
static struct intel_memory_region *
@@ -437,11 +441,11 @@ i915_ttm_resource_get_st(struct drm_i915_gem_object *obj,
return intel_region_ttm_resource_to_st(obj->mm.region, res);
}
-static int i915_ttm_accel_move(struct ttm_buffer_object *bo,
- bool clear,
- struct ttm_resource *dst_mem,
- struct ttm_tt *dst_ttm,
- struct sg_table *dst_st)
+static struct i915_request *i915_ttm_accel_move(struct ttm_buffer_object *bo,
+ bool clear,
+ struct ttm_resource *dst_mem,
+ struct ttm_tt *dst_ttm,
+ struct sg_table *dst_st)
{
struct drm_i915_private *i915 = container_of(bo->bdev, typeof(*i915),
bdev);
@@ -449,18 +453,18 @@ static int i915_ttm_accel_move(struct ttm_buffer_object *bo,
ttm_manager_type(bo->bdev, bo->resource->mem_type);
struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
struct sg_table *src_st;
- struct i915_request *rq;
+ struct i915_request *rq = NULL;
struct ttm_tt *src_ttm = bo->ttm;
enum i915_cache_level src_level, dst_level;
int ret;
if (!i915->gt.migrate.context || intel_gt_is_wedged(&i915->gt))
- return -EINVAL;
+ return ERR_PTR(-EINVAL);
dst_level = i915_ttm_cache_level(i915, dst_mem, dst_ttm);
if (clear) {
if (bo->type == ttm_bo_type_kernel)
- return -EINVAL;
+ return ERR_PTR(-EINVAL);
intel_engine_pm_get(i915->gt.migrate.context->engine);
ret = intel_context_migrate_clear(i915->gt.migrate.context, NULL,
@@ -468,10 +472,6 @@ static int i915_ttm_accel_move(struct ttm_buffer_object *bo,
gpu_binds_iomem(dst_mem),
0, &rq);
- if (!ret && rq) {
- i915_request_wait(rq, 0, MAX_SCHEDULE_TIMEOUT);
- i915_request_put(rq);
- }
intel_engine_pm_put(i915->gt.migrate.context->engine);
} else {
src_st = src_man->use_tt ? i915_ttm_tt_get_st(src_ttm) :
@@ -485,52 +485,41 @@ static int i915_ttm_accel_move(struct ttm_buffer_object *bo,
dst_st->sgl, dst_level,
gpu_binds_iomem(dst_mem),
&rq);
- if (!ret && rq) {
- i915_request_wait(rq, 0, MAX_SCHEDULE_TIMEOUT);
- i915_request_put(rq);
- }
intel_engine_pm_put(i915->gt.migrate.context->engine);
}
- return ret;
+ return ret ? ERR_PTR(ret) : rq;
}
-static void __i915_ttm_move(struct ttm_buffer_object *bo, bool clear,
+static void i915_ttm_memcpy(struct ttm_buffer_object *bo, bool clear,
struct ttm_resource *dst_mem,
struct ttm_tt *dst_ttm,
- struct sg_table *dst_st,
- bool allow_accel)
+ struct sg_table *dst_st)
{
- int ret = -EINVAL;
-
- if (allow_accel)
- ret = i915_ttm_accel_move(bo, clear, dst_mem, dst_ttm, dst_st);
- if (ret) {
- struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
- struct intel_memory_region *dst_reg, *src_reg;
- union {
- struct ttm_kmap_iter_tt tt;
- struct ttm_kmap_iter_iomap io;
- } _dst_iter, _src_iter;
- struct ttm_kmap_iter *dst_iter, *src_iter;
-
- dst_reg = i915_ttm_region(bo->bdev, dst_mem->mem_type);
- src_reg = i915_ttm_region(bo->bdev, bo->resource->mem_type);
- GEM_BUG_ON(!dst_reg || !src_reg);
-
- dst_iter = !cpu_maps_iomem(dst_mem) ?
- ttm_kmap_iter_tt_init(&_dst_iter.tt, dst_ttm) :
- ttm_kmap_iter_iomap_init(&_dst_iter.io, &dst_reg->iomap,
- dst_st, dst_reg->region.start);
-
- src_iter = !cpu_maps_iomem(bo->resource) ?
- ttm_kmap_iter_tt_init(&_src_iter.tt, bo->ttm) :
- ttm_kmap_iter_iomap_init(&_src_iter.io, &src_reg->iomap,
- obj->ttm.cached_io_st,
- src_reg->region.start);
-
- ttm_move_memcpy(clear, dst_mem->num_pages, dst_iter, src_iter);
- }
+ struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
+ struct intel_memory_region *dst_reg, *src_reg;
+ union {
+ struct ttm_kmap_iter_tt tt;
+ struct ttm_kmap_iter_iomap io;
+ } _dst_iter, _src_iter;
+ struct ttm_kmap_iter *dst_iter, *src_iter;
+
+ dst_reg = i915_ttm_region(bo->bdev, dst_mem->mem_type);
+ src_reg = i915_ttm_region(bo->bdev, bo->resource->mem_type);
+ GEM_BUG_ON(!dst_reg || !src_reg);
+
+ dst_iter = !cpu_maps_iomem(dst_mem) ?
+ ttm_kmap_iter_tt_init(&_dst_iter.tt, dst_ttm) :
+ ttm_kmap_iter_iomap_init(&_dst_iter.io, &dst_reg->iomap,
+ dst_st, dst_reg->region.start);
+
+ src_iter = !cpu_maps_iomem(bo->resource) ?
+ ttm_kmap_iter_tt_init(&_src_iter.tt, bo->ttm) :
+ ttm_kmap_iter_iomap_init(&_src_iter.io, &src_reg->iomap,
+ obj->ttm.cached_io_st,
+ src_reg->region.start);
+
+ ttm_move_memcpy(clear, dst_mem->num_pages, dst_iter, src_iter);
}
static int i915_ttm_move(struct ttm_buffer_object *bo, bool evict,
@@ -545,6 +534,7 @@ static int i915_ttm_move(struct ttm_buffer_object *bo, bool evict,
struct sg_table *dst_st;
bool clear;
int ret;
+ struct i915_request *rq;
/* Sync for now. We could do the actual copy async. */
ret = ttm_bo_wait_ctx(bo, ctx);
@@ -573,10 +563,22 @@ static int i915_ttm_move(struct ttm_buffer_object *bo, bool evict,
return PTR_ERR(dst_st);
clear = !cpu_maps_iomem(bo->resource) && (!ttm || !ttm_tt_is_populated(ttm));
+
+ rq = NULL;
if (!(clear && ttm && !(ttm->page_flags & TTM_TT_FLAG_ZERO_ALLOC)))
- __i915_ttm_move(bo, clear, dst_mem, bo->ttm, dst_st, true);
+ rq = i915_ttm_accel_move(bo, clear, dst_mem, bo->ttm, dst_st);
+
+ if (IS_ERR(rq))
+ i915_ttm_memcpy(bo, clear, dst_mem, bo->ttm, dst_st);
+
+ /* Below dst_mem becomes bo->resource. */
+ if (!IS_ERR_OR_NULL(rq)) {
+ ttm_bo_move_accel_cleanup(bo, &rq->fence, evict, true, dst_mem);
+ i915_request_put(rq);
+ } else {
+ ttm_bo_move_sync_cleanup(bo, dst_mem);
+ }
- ttm_bo_move_sync_cleanup(bo, dst_mem);
i915_ttm_adjust_domains_after_move(obj);
i915_ttm_free_cached_io_st(obj);
@@ -1019,6 +1021,7 @@ int i915_gem_obj_copy_ttm(struct drm_i915_gem_object *dst,
.interruptible = intr,
};
struct sg_table *dst_st;
+ struct i915_request *rq = ERR_PTR(-ENODEV);
int ret;
assert_object_held(dst);
@@ -1036,8 +1039,22 @@ int i915_gem_obj_copy_ttm(struct drm_i915_gem_object *dst,
dst_st = gpu_binds_iomem(dst_bo->resource) ?
dst->ttm.cached_io_st : i915_ttm_tt_get_st(dst_bo->ttm);
- __i915_ttm_move(src_bo, false, dst_bo->resource, dst_bo->ttm,
- dst_st, allow_accel);
+ if (allow_accel) {
+ rq = i915_ttm_accel_move(src_bo, false, dst_bo->resource,
+ dst_bo->ttm, dst_st);
+ if (!IS_ERR_OR_NULL(rq)) {
+ unsigned int wait_flags =
+ intr ? I915_WAIT_INTERRUPTIBLE : 0;
- return 0;
+ ret = i915_request_wait(rq, wait_flags,
+ MAX_SCHEDULE_TIMEOUT);
+ i915_request_put(rq);
+ }
+ }
+
+ if (IS_ERR(rq))
+ i915_ttm_memcpy(src_bo, false, dst_bo->resource,
+ dst_bo->ttm, dst_st);
+
+ return ret;
}
--
2.33.0
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