From: Thomas Hellström thomas.hellstrom@linux.intel.com
Instead of relying on a static placement, calculate at get_pages() time. This should work for LMEM regions and system for now. For stolen we need to take preallocated range into account. That well be added later.
Signed-off-by: Thomas Hellström thomas.hellstrom@linux.intel.com --- drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 69 +++++++++++++++++++++---- drivers/gpu/drm/i915/intel_region_ttm.c | 8 ++- drivers/gpu/drm/i915/intel_region_ttm.h | 2 + 3 files changed, 68 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c index 9dd6e4f69d53..73d52df8f2be 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c @@ -24,6 +24,11 @@ #define I915_TTM_PRIO_NO_PAGES 1 #define I915_TTM_PRIO_HAS_PAGES 2
+/* + * Size of struct ttm_place vector in on-stack struct ttm_placement allocs + */ +#define I915_TTM_MAX_PLACEMENTS 10 + /** * struct i915_ttm_tt - TTM page vector with additional private information * @ttm: The base TTM page vector. @@ -56,13 +61,6 @@ static const struct ttm_place lmem0_sys_placement_flags[] = { } };
-static struct ttm_placement i915_lmem0_placement = { - .num_placement = 1, - .placement = &lmem0_sys_placement_flags[0], - .num_busy_placement = 1, - .busy_placement = &lmem0_sys_placement_flags[0], -}; - static struct ttm_placement i915_sys_placement = { .num_placement = 1, .placement = &lmem0_sys_placement_flags[1], @@ -72,6 +70,55 @@ static struct ttm_placement i915_sys_placement = {
static void i915_ttm_adjust_lru(struct drm_i915_gem_object *obj);
+static enum ttm_caching +i915_ttm_select_tt_caching(const struct drm_i915_gem_object *obj) +{ + /* + * Objects only allowed in system get cached cpu-mappings. + * Other objects get WC mapping for now. Even if in system. + */ + if (obj->mm.region->type == INTEL_MEMORY_SYSTEM && + obj->mm.n_placements <= 1) + return ttm_cached; + + return ttm_write_combined; +} + +static void +i915_ttm_place_from_region(const struct intel_memory_region *mr, + struct ttm_place *place) +{ + memset(place, 0, sizeof(*place)); + place->mem_type = intel_region_to_ttm_type(mr); +} + +static void +i915_ttm_placement_from_obj(const struct drm_i915_gem_object *obj, + struct ttm_place *requested, + struct ttm_place *busy, + struct ttm_placement *placement) +{ + unsigned int i; + unsigned int num_allowed = obj->mm.n_placements; + + placement->num_placement = 1; + i915_ttm_place_from_region(num_allowed ? obj->mm.placements[0] : + obj->mm.region, requested); + + /* Cache this on object? */ + placement->num_busy_placement = num_allowed; + for (i = 0; i < placement->num_busy_placement; ++i) + i915_ttm_place_from_region(obj->mm.placements[i], busy + i); + + if (num_allowed == 0) { + *busy = *requested; + placement->num_busy_placement = 1; + } + + placement->placement = requested; + placement->busy_placement = busy; +} + static struct ttm_tt *i915_ttm_tt_create(struct ttm_buffer_object *bo, uint32_t page_flags) { @@ -89,7 +136,8 @@ static struct ttm_tt *i915_ttm_tt_create(struct ttm_buffer_object *bo, man->use_tt) page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
- ret = ttm_tt_init(&i915_tt->ttm, bo, page_flags, ttm_write_combined); + ret = ttm_tt_init(&i915_tt->ttm, bo, page_flags, + i915_ttm_select_tt_caching(obj)); if (ret) { kfree(i915_tt); return NULL; @@ -414,10 +462,13 @@ static int i915_ttm_get_pages(struct drm_i915_gem_object *obj) .no_wait_gpu = false, }; struct sg_table *st; + struct ttm_place requested, busy[I915_TTM_MAX_PLACEMENTS]; + struct ttm_placement placement; int ret;
/* Move to the requested placement. */ - ret = ttm_bo_validate(bo, &i915_lmem0_placement, &ctx); + i915_ttm_placement_from_obj(obj, &requested, busy, &placement); + ret = ttm_bo_validate(bo, &placement, &ctx); if (ret) return ret == -ENOSPC ? -ENXIO : ret;
diff --git a/drivers/gpu/drm/i915/intel_region_ttm.c b/drivers/gpu/drm/i915/intel_region_ttm.c index 27fe0668d094..5a664f6cc93f 100644 --- a/drivers/gpu/drm/i915/intel_region_ttm.c +++ b/drivers/gpu/drm/i915/intel_region_ttm.c @@ -50,12 +50,16 @@ void intel_region_ttm_device_fini(struct drm_i915_private *dev_priv) * driver-private types for now, reserving TTM_PL_VRAM for stolen * memory and TTM_PL_TT for GGTT use if decided to implement this. */ -static int intel_region_to_ttm_type(struct intel_memory_region *mem) +int intel_region_to_ttm_type(const struct intel_memory_region *mem) { int type;
GEM_BUG_ON(mem->type != INTEL_MEMORY_LOCAL && - mem->type != INTEL_MEMORY_MOCK); + mem->type != INTEL_MEMORY_MOCK && + mem->type != INTEL_MEMORY_SYSTEM); + + if (mem->type == INTEL_MEMORY_SYSTEM) + return TTM_PL_SYSTEM;
type = mem->instance + TTM_PL_PRIV; GEM_BUG_ON(type >= TTM_NUM_MEM_TYPES); diff --git a/drivers/gpu/drm/i915/intel_region_ttm.h b/drivers/gpu/drm/i915/intel_region_ttm.h index e8cf830fda6f..5eedcc397bd5 100644 --- a/drivers/gpu/drm/i915/intel_region_ttm.h +++ b/drivers/gpu/drm/i915/intel_region_ttm.h @@ -22,6 +22,8 @@ int intel_region_ttm_init(struct intel_memory_region *mem);
void intel_region_ttm_fini(struct intel_memory_region *mem);
+int intel_region_to_ttm_type(const struct intel_memory_region *mem); + struct sg_table *intel_region_ttm_node_to_st(struct intel_memory_region *mem, struct ttm_resource *res);