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 will if needed be added
later.
Signed-off-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld at intel.com>
---
v2:
- Fixed a style issue (Reported by Matthew Auld)
v3:
- Make sure we don't add more placements to the stack-allocated vector
than there is room for. (Reported by Matthew Auld)
v4:
- Remove confusion around shrinkable objects (Reported by Matthew Auld)
---
drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 95 ++++++++++++++++++-------
drivers/gpu/drm/i915/intel_region_ttm.c | 8 ++-
drivers/gpu/drm/i915/intel_region_ttm.h | 2 +
3 files changed, 77 insertions(+), 28 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index 5176682a7d19..1c45f9c87946 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 INTEL_REGION_UNKNOWN
+
/**
* struct i915_ttm_tt - TTM page vector with additional private information
* @ttm: The base TTM page vector.
@@ -42,32 +47,18 @@ struct i915_ttm_tt {
struct sg_table *cached_st;
};
-static const struct ttm_place lmem0_sys_placement_flags[] = {
- {
- .fpfn = 0,
- .lpfn = 0,
- .mem_type = I915_PL_LMEM0,
- .flags = 0,
- }, {
- .fpfn = 0,
- .lpfn = 0,
- .mem_type = I915_PL_SYSTEM,
- .flags = 0,
- }
-};
-
-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 const struct ttm_place sys_placement_flags = {
+ .fpfn = 0,
+ .lpfn = 0,
+ .mem_type = I915_PL_SYSTEM,
+ .flags = 0,
};
static struct ttm_placement i915_sys_placement = {
.num_placement = 1,
- .placement = &lmem0_sys_placement_flags[1],
+ .placement = &sys_placement_flags,
.num_busy_placement = 1,
- .busy_placement = &lmem0_sys_placement_flags[1],
+ .busy_placement = &sys_placement_flags,
};
static bool gpu_binds_iomem(struct ttm_resource *mem)
@@ -83,6 +74,55 @@ static bool cpu_maps_iomem(struct ttm_resource *mem)
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 num_allowed = obj->mm.n_placements;
+ unsigned int i;
+
+ 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)
{
@@ -100,7 +140,8 @@ 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;
@@ -464,10 +505,15 @@ 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;
+ GEM_BUG_ON(obj->mm.n_placements > I915_TTM_MAX_PLACEMENTS);
+
/* 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;
@@ -621,7 +667,6 @@ static u64 i915_ttm_mmap_offset(struct drm_i915_gem_object *obj)
const struct drm_i915_gem_object_ops i915_gem_ttm_obj_ops = {
.name = "i915_gem_object_ttm",
- .flags = I915_GEM_OBJECT_IS_SHRINKABLE,
.get_pages = i915_ttm_get_pages,
.put_pages = i915_ttm_put_pages,
@@ -683,7 +728,6 @@ int __i915_gem_ttm_object_init(struct intel_memory_region *mem,
i915_gem_object_make_unshrinkable(obj);
INIT_RADIX_TREE(&obj->ttm.get_io_page.radix, GFP_KERNEL | __GFP_NOWARN);
mutex_init(&obj->ttm.get_io_page.lock);
-
bo_type = (obj->flags & I915_BO_ALLOC_USER) ? ttm_bo_type_device :
ttm_bo_type_kernel;
@@ -707,7 +751,6 @@ int __i915_gem_ttm_object_init(struct intel_memory_region *mem,
i915_ttm_adjust_domains_after_cpu_move(obj);
i915_ttm_adjust_gem_after_move(obj);
i915_gem_object_unlock(obj);
-
out:
/* i915 wants -ENXIO when out of memory region space. */
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..649491844e79 100644
--- a/drivers/gpu/drm/i915/intel_region_ttm.h
+++ b/drivers/gpu/drm/i915/intel_region_ttm.h
@@ -28,6 +28,8 @@ struct sg_table *intel_region_ttm_node_to_st(struct intel_memory_region *mem,
void intel_region_ttm_node_free(struct intel_memory_region *mem,
struct ttm_resource *node);
+int intel_region_to_ttm_type(const struct intel_memory_region *mem);
+
struct ttm_device_funcs *i915_ttm_driver(void);
#ifdef CONFIG_DRM_I915_SELFTEST
--
2.31.1