From: Michel Thierry Date: Wed, 8 Apr 2015 11:13:33 +0000 (+0100) Subject: drm/i915/gen8: begin bitmap tracking X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=33c8819f1b057b555c73886f69f9baabe72527e0;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git drm/i915/gen8: begin bitmap tracking Like with gen6/7, we can enable bitmap tracking with all the preallocations to make sure things actually don't blow up. v2: Rebased to match changes from previous patches. v3: Without teardown logic, rely on used_pdpes and used_pdes when freeing page tables. v4: Rebased after s/page_tables/page_table/. v5: Rebased after page table generalizations. Signed-off-by: Ben Widawsky Signed-off-by: Michel Thierry (v2+) Reviewed-by: Mika Kuoppala Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 1e1b42f8da42..1be0a8ee8dd7 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -437,6 +437,7 @@ static void unmap_and_free_pd(struct i915_page_directory *pd, if (pd->page) { i915_dma_unmap_single(pd, dev); __free_page(pd->page); + kfree(pd->used_pdes); kfree(pd); } } @@ -444,26 +445,35 @@ static void unmap_and_free_pd(struct i915_page_directory *pd, static struct i915_page_directory *alloc_pd_single(struct drm_device *dev) { struct i915_page_directory *pd; - int ret; + int ret = -ENOMEM; pd = kzalloc(sizeof(*pd), GFP_KERNEL); if (!pd) return ERR_PTR(-ENOMEM); + pd->used_pdes = kcalloc(BITS_TO_LONGS(I915_PDES), + sizeof(*pd->used_pdes), GFP_KERNEL); + if (!pd->used_pdes) + goto free_pd; + pd->page = alloc_page(GFP_KERNEL); - if (!pd->page) { - kfree(pd); - return ERR_PTR(-ENOMEM); - } + if (!pd->page) + goto free_bitmap; ret = i915_dma_map_single(pd, dev); - if (ret) { - __free_page(pd->page); - kfree(pd); - return ERR_PTR(ret); - } + if (ret) + goto free_page; return pd; + +free_page: + __free_page(pd->page); +free_bitmap: + kfree(pd->used_pdes); +free_pd: + kfree(pd); + + return ERR_PTR(ret); } /* Broadwell Page Directory Pointer Descriptors */ @@ -675,7 +685,7 @@ static void gen8_free_page_tables(struct i915_page_directory *pd, struct drm_dev if (!pd->page) return; - for (i = 0; i < I915_PDES; i++) { + for_each_set_bit(i, pd->used_pdes, I915_PDES) { if (WARN_ON(!pd->page_table[i])) continue; @@ -688,7 +698,7 @@ static void gen8_ppgtt_free(struct i915_hw_ppgtt *ppgtt) { int i; - for (i = 0; i < GEN8_LEGACY_PDPES; i++) { + for_each_set_bit(i, ppgtt->pdp.used_pdpes, GEN8_LEGACY_PDPES) { if (WARN_ON(!ppgtt->pdp.page_directory[i])) continue; @@ -752,6 +762,7 @@ static int gen8_ppgtt_alloc_page_directories(struct i915_hw_ppgtt *ppgtt, gen8_for_each_pdpe(unused, pdp, start, length, temp, pdpe) { WARN_ON(unused); pdp->page_directory[pdpe] = alloc_pd_single(dev); + if (IS_ERR(pdp->page_directory[pdpe])) goto unwind_out; @@ -775,10 +786,13 @@ static int gen8_alloc_va_range(struct i915_address_space *vm, struct i915_hw_ppgtt *ppgtt = container_of(vm, struct i915_hw_ppgtt, base); struct i915_page_directory *pd; + const uint64_t orig_start = start; + const uint64_t orig_length = length; uint64_t temp; uint32_t pdpe; int ret; + /* Do the allocations first so we can easily bail out */ ret = gen8_ppgtt_alloc_page_directories(ppgtt, &ppgtt->pdp, start, length); if (ret) return ret; @@ -789,6 +803,27 @@ static int gen8_alloc_va_range(struct i915_address_space *vm, goto err_out; } + /* Now mark everything we've touched as used. This doesn't allow for + * robust error checking, but it makes the code a hell of a lot simpler. + */ + start = orig_start; + length = orig_length; + + gen8_for_each_pdpe(pd, &ppgtt->pdp, start, length, temp, pdpe) { + struct i915_page_table *pt; + uint64_t pd_len = gen8_clamp_pd(start, length); + uint64_t pd_start = start; + uint32_t pde; + + gen8_for_each_pde(pt, &ppgtt->pd, pd_start, pd_len, temp, pde) { + bitmap_set(pd->page_table[pde]->used_ptes, + gen8_pte_index(start), + gen8_pte_count(start, length)); + set_bit(pde, pd->used_pdes); + } + set_bit(pdpe, ppgtt->pdp.used_pdpes); + } + return 0; err_out: diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h index c3d5d40b78b2..29de64d1164e 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.h +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h @@ -220,11 +220,13 @@ struct i915_page_directory { dma_addr_t daddr; }; + unsigned long *used_pdes; struct i915_page_table *page_table[I915_PDES]; /* PDEs */ }; struct i915_page_directory_pointer { /* struct page *page; */ + DECLARE_BITMAP(used_pdpes, GEN8_LEGACY_PDPES); struct i915_page_directory *page_directory[GEN8_LEGACY_PDPES]; }; @@ -453,6 +455,11 @@ static inline uint32_t gen8_pml4e_index(uint64_t address) return 0; } +static inline size_t gen8_pte_count(uint64_t address, uint64_t length) +{ + return i915_pte_count(address, length, GEN8_PDE_SHIFT); +} + int i915_gem_gtt_init(struct drm_device *dev); void i915_gem_init_global_gtt(struct drm_device *dev); void i915_global_gtt_cleanup(struct drm_device *dev);