diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_gtt.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_gtt.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 74df3d1581dd..2034f7cf238b 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -716,15 +716,19 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt, uint64_t size) if (size % (1<<30)) DRM_INFO("Pages will be wasted unless GTT size (%llu) is divisible by 1GB\n", size); - /* 1. Do all our allocations for page directories and page tables. */ - ret = gen8_ppgtt_alloc(ppgtt, max_pdp); + /* 1. Do all our allocations for page directories and page tables. + * We allocate more than was asked so that we can point the unused parts + * to valid entries that point to scratch page. Dynamic page tables + * will fix this eventually. + */ + ret = gen8_ppgtt_alloc(ppgtt, GEN8_LEGACY_PDPES); if (ret) return ret; /* * 2. Create DMA mappings for the page directories and page tables. */ - for (i = 0; i < max_pdp; i++) { + for (i = 0; i < GEN8_LEGACY_PDPES; i++) { ret = gen8_ppgtt_setup_page_directories(ppgtt, i); if (ret) goto bail; @@ -744,7 +748,7 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt, uint64_t size) * plugged in correctly. So we do that now/here. For aliasing PPGTT, we * will never need to touch the PDEs again. */ - for (i = 0; i < max_pdp; i++) { + for (i = 0; i < GEN8_LEGACY_PDPES; i++) { struct i915_page_directory_entry *pd = ppgtt->pdp.page_directory[i]; gen8_ppgtt_pde_t *pd_vaddr; pd_vaddr = kmap_atomic(ppgtt->pdp.page_directory[i]->page); @@ -764,9 +768,14 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt, uint64_t size) ppgtt->base.insert_entries = gen8_ppgtt_insert_entries; ppgtt->base.cleanup = gen8_ppgtt_cleanup; ppgtt->base.start = 0; - ppgtt->base.total = ppgtt->num_pd_entries * GEN8_PTES_PER_PAGE * PAGE_SIZE; - ppgtt->base.clear_range(&ppgtt->base, 0, ppgtt->base.total, true); + /* This is the area that we advertise as usable for the caller */ + ppgtt->base.total = max_pdp * GEN8_PDES_PER_PAGE * GEN8_PTES_PER_PAGE * PAGE_SIZE; + + /* Set all ptes to a valid scratch page. Also above requested space */ + ppgtt->base.clear_range(&ppgtt->base, 0, + ppgtt->num_pd_pages * GEN8_PTES_PER_PAGE * PAGE_SIZE, + true); DRM_DEBUG_DRIVER("Allocated %d pages for page directories (%d wasted)\n", ppgtt->num_pd_pages, ppgtt->num_pd_pages - max_pdp); |