diff options
| -rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 64 |
1 files changed, 61 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c index df46535cca47..c5deb8b7227c 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c @@ -64,6 +64,33 @@ static struct ttm_placement i915_sys_placement = { .busy_placement = &sys_placement_flags, }; +static int i915_ttm_err_to_gem(int err) +{ + /* Fastpath */ + if (likely(!err)) + return 0; + + switch (err) { + case -EBUSY: + /* + * TTM likes to convert -EDEADLK to -EBUSY, and wants us to + * restart the operation, since we don't record the contending + * lock. We use -EAGAIN to restart. + */ + return -EAGAIN; + case -ENOSPC: + /* + * Memory type / region is full, and we can't evict. + * Except possibly system, that returns -ENOMEM; + */ + return -ENXIO; + default: + break; + } + + return err; +} + static void i915_ttm_adjust_lru(struct drm_i915_gem_object *obj); static enum ttm_caching @@ -522,15 +549,46 @@ static int i915_ttm_get_pages(struct drm_i915_gem_object *obj) struct sg_table *st; struct ttm_place requested, busy[I915_TTM_MAX_PLACEMENTS]; struct ttm_placement placement; + int real_num_busy; int ret; GEM_BUG_ON(obj->mm.n_placements > I915_TTM_MAX_PLACEMENTS); /* Move to the requested placement. */ i915_ttm_placement_from_obj(obj, &requested, busy, &placement); + + /* + * For now we support LMEM only with TTM. + * TODO: Remove with system support + */ + GEM_BUG_ON(requested.mem_type < I915_PL_LMEM0 || + busy[0].mem_type < I915_PL_LMEM0); + + /* First try only the requested placement. No eviction. */ + real_num_busy = fetch_and_zero(&placement.num_busy_placement); ret = ttm_bo_validate(bo, &placement, &ctx); - if (ret) - return ret == -ENOSPC ? -ENXIO : ret; + if (ret) { + ret = i915_ttm_err_to_gem(ret); + /* + * Anything that wants to restart the operation gets to + * do that. + */ + if (ret == -EDEADLK || ret == -EINTR || ret == -ERESTARTSYS || + ret == -EAGAIN) + return ret; + + /* TODO: Remove this when we support system as TTM. */ + real_num_busy = 1; + + /* + * If the initial attempt fails, allow all accepted placements, + * evicting if necessary. + */ + placement.num_busy_placement = real_num_busy; + ret = ttm_bo_validate(bo, &placement, &ctx); + if (ret) + return i915_ttm_err_to_gem(ret); + } /* Object either has a page vector or is an iomem object */ st = bo->ttm ? i915_ttm_tt_get_st(bo->ttm) : obj->ttm.cached_io_st; @@ -741,5 +799,5 @@ int __i915_gem_ttm_object_init(struct intel_memory_region *mem, obj->ttm.created = true; /* i915 wants -ENXIO when out of memory region space. */ - return (ret == -ENOSPC) ? -ENXIO : ret; + return i915_ttm_err_to_gem(ret); } |