On 6/22/21 12:55 PM, Matthew Auld wrote:
On Tue, 22 Jun 2021 at 10:34, Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx> wrote:For discrete, use TTM for both cached and WC system memory. That means we currently rely on the TTM memory accounting / shrinker. For cached system memory we should consider remaining shmem-backed, which can be implemented from our ttm_tt_populate callback. We can then also reuse our own very elaborate shrinker for that memory. Signed-off-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx> Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx> --- v2: - Fix IS_ERR_OR_NULL() check to IS_ERR() (Reported by Matthew Auld) v3: - Commit message typo fix v6: - Fix TODO:s for supporting system memory with TTM. - Update the object GEM region after a TTM move if compatible. - Add a couple of warnings for shmem on DGFX. --- drivers/gpu/drm/i915/gem/i915_gem_shmem.c | 3 ++ drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 51 +++++++++++++++++----- drivers/gpu/drm/i915/i915_drv.h | 3 -- drivers/gpu/drm/i915/intel_memory_region.c | 7 ++- drivers/gpu/drm/i915/intel_memory_region.h | 8 ++++ 5 files changed, 58 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c index 7aa1c95c7b7d..3648ae1d6628 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c @@ -284,6 +284,7 @@ __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj, bool needs_clflush) { GEM_BUG_ON(obj->mm.madv == __I915_MADV_PURGED); + GEM_WARN_ON(IS_DGFX(to_i915(obj->base.dev))); if (obj->mm.madv == I915_MADV_DONTNEED) obj->mm.dirty = false; @@ -302,6 +303,7 @@ void i915_gem_object_put_pages_shmem(struct drm_i915_gem_object *obj, struct sg_ struct pagevec pvec; struct page *page; + GEM_WARN_ON(IS_DGFX(to_i915(obj->base.dev))); __i915_gem_object_release_shmem(obj, pages, true); i915_gem_gtt_finish_pages(obj, pages); @@ -560,6 +562,7 @@ i915_gem_object_create_shmem_from_data(struct drm_i915_private *dev_priv, resource_size_t offset; int err; + GEM_WARN_ON(IS_DGFX(dev_priv)); obj = i915_gem_object_create_shmem(dev_priv, round_up(size, PAGE_SIZE)); if (IS_ERR(obj)) return obj; diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c index 966b292d07da..07097f150065 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c @@ -286,6 +286,25 @@ static void i915_ttm_adjust_gem_after_move(struct drm_i915_gem_object *obj) { struct ttm_buffer_object *bo = i915_gem_to_ttm(obj); unsigned int cache_level; + unsigned int i; + + /* + * If object was moved to an allowable region, update the object + * region to consider it migrated. Note that if it's currently not + * in an allowable region, it's evicted and we don't update the + * object region. + */ + if (intel_region_to_ttm_type(obj->mm.region) != bo->resource->mem_type) { + for (i = 0; i < obj->mm.n_placements; ++i) { + struct intel_memory_region *mr = obj->mm.placements[i]; + + if (intel_region_to_ttm_type(mr) == bo->resource->mem_type && + mr != obj->mm.region) { + intel_memory_region_put(obj->mm.region); + obj->mm.region = intel_memory_region_get(mr);break;? i915_gem_object_{init, release}_memory_region? There is also the region_link stuff, but I guess we can nuke that?
Ah, yes, I'll fix that up. I think we will actually need that for suspend/resume, as the TTM LRU lists aren't sufficient...
Thanks for reviewing! /Thomas
