/* * Copyright © 2010 Daniel Vetter * Copyright © 2011-2014 Intel Corporation * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. * */ #include #include #include #include "i915_drv.h" #include "i915_trace.h" #include "intel_drv.h" static void gen8_setup_private_ppat(struct drm_i915_private *dev_priv); bool intel_enable_ppgtt(struct drm_device *dev, bool full) { if (i915.enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev)) return false; if (i915.enable_ppgtt == 1 && full) return false; #ifdef CONFIG_INTEL_IOMMU /* Disable ppgtt on SNB if VT-d is on. */ if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped) { DRM_INFO("Disabling PPGTT because VT-d is on\n"); return false; } #endif /* Full ppgtt disabled by default for now due to issues. */ if (full) return HAS_PPGTT(dev) && (i915.enable_ppgtt == 2); else return HAS_ALIASING_PPGTT(dev); } static void ppgtt_bind_vma(struct i915_vma *vma, enum i915_cache_level cache_level, u32 flags); static void ppgtt_unbind_vma(struct i915_vma *vma); static int gen8_ppgtt_enable(struct i915_hw_ppgtt *ppgtt); static inline gen8_gtt_pte_t gen8_pte_encode(dma_addr_t addr, enum i915_cache_level level, bool valid) { gen8_gtt_pte_t pte = valid ? _PAGE_PRESENT | _PAGE_RW : 0; pte |= addr; switch (level) { case I915_CACHE_NONE: pte |= PPAT_UNCACHED_INDEX; break; case I915_CACHE_WT: pte |= PPAT_DISPLAY_ELLC_INDEX; break; default: pte |= PPAT_CACHED_INDEX; break; } return pte; } static inline gen8_ppgtt_pde_t gen8_pde_encode(struct drm_device *dev, dma_addr_t addr, enum i915_cache_level level) { gen8_ppgtt_pde_t pde = _PAGE_PRESENT | _PAGE_RW; pde |= addr; if (level != I915_CACHE_NONE) pde |= PPAT_CACHED_PDE_INDEX; else pde |= PPAT_UNCACHED_INDEX; return pde; } static gen6_gtt_pte_t snb_pte_encode(dma_addr_t addr, enum i915_cache_level level, bool valid) { gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0; pte |= GEN6_PTE_ADDR_ENCODE(addr); switch (level) { case I915_CACHE_L3_LLC: case I915_CACHE_LLC: pte |= GEN6_PTE_CACHE_LLC; break; case I915_CACHE_NONE: pte |= GEN6_PTE_UNCACHED; break; default: WARN_ON(1); } return pte; } static gen6_gtt_pte_t ivb_pte_encode(dma_addr_t addr, enum i915_cache_level level, bool valid) { gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0; pte |= GEN6_PTE_ADDR_ENCODE(addr); switch (level) { case I915_CACHE_L3_LLC: pte |= GEN7_PTE_CACHE_L3_LLC; break; case I915_CACHE_LLC: pte |= GEN6_PTE_CACHE_LLC; break; case I915_CACHE_NONE: pte |= GEN6_PTE_UNCACHED; break; default: WARN_ON(1); } return pte; } static gen6_gtt_pte_t byt_pte_encode(dma_addr_t addr, enum i915_cache_level level, bool valid) { gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0; pte |= GEN6_PTE_ADDR_ENCODE(addr); /* Mark the page as writeable. Other platforms don't have a * setting for read-only/writable, so this matches that behavior. */ pte |= BYT_PTE_WRITEABLE; if (level != I915_CACHE_NONE) pte |= BYT_PTE_SNOOPED_BY_CPU_CACHES; return pte; } static gen6_gtt_pte_t hsw_pte_encode(dma_addr_t addr, enum i915_cache_level level, bool valid) { gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0; pte |= HSW_PTE_ADDR_ENCODE(addr); if (level != I915_CACHE_NONE) pte |= HSW_WB_LLC_AGE3; return pte; } static gen6_gtt_pte_t iris_pte_encode(dma_addr_t addr, enum i915_cache_level level, bool valid) { gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0; pte |= HSW_PTE_ADDR_ENCODE(addr); switch (level) { case I915_CACHE_NONE: break; case I915_CACHE_WT: pte |= HSW_WT_ELLC_LLC_AGE3; break; default: pte |= HSW_WB_ELLC_LLC_AGE3; break; } return pte; } /* Broadwell Page Directory Pointer Descriptors */ static int gen8_write_pdp(struct intel_ring_buffer *ring, unsigned entry, uint64_t val, bool synchronous) { struct drm_i915_private *dev_priv = ring->dev->dev_private; int ret; BUG_ON(entry >= 4); if (synchronous) { I915_WRITE(GEN8_RING_PDP_UDW(ring, entry), val >> 32); I915_WRITE(GEN8_RING_PDP_LDW(ring, entry), (u32)val); return 0; } ret = intel_ring_begin(ring, 6); if (ret) return ret; intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1)); intel_ring_emit(ring, GEN8_RING_PDP_UDW(ring, entry)); intel_ring_emit(ring, (u32)(val >> 32)); intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1)); intel_ring_emit(ring, GEN8_RING_PDP_LDW(ring, entry)); intel_ring_emit(ring, (u32)(val)); intel_ring_advance(ring); return 0; } static int gen8_mm_switch(struct i915_hw_ppgtt *ppgtt, struct intel_ring_buffer *ring, bool synchronous) { int i, ret; /* bit of a hack to find the actual last used pd */ int used_pd = ppgtt->num_pd_entries / GEN8_PDES_PER_PAGE; for (i = used_pd - 1; i >= 0; i--) { dma_addr_t addr = ppgtt->pd_dma_addr[i]; ret = gen8_write_pdp(ring, i, addr, synchronous); if (ret) return ret; } return 0; } static void gen8_ppgtt_clear_range(struct i915_address_space *vm, uint64_t start, uint64_t length, bool use_scratch) { struct i915_hw_ppgtt *ppgtt = container_of(vm, struct i915_hw_ppgtt, base); gen8_gtt_pte_t *pt_vaddr, scratch_pte; unsigned pdpe = start >> GEN8_PDPE_SHIFT & GEN8_PDPE_MASK; unsigned pde = start >> GEN8_PDE_SHIFT & GEN8_PDE_MASK; unsigned pte = start >> GEN8_PTE_SHIFT & GEN8_PTE_MASK; unsigned num_entries = length >> PAGE_SHIFT; unsigned last_pte, i; scratch_pte = gen8_pte_encode(ppgtt->base.scratch.addr, I915_CACHE_LLC, use_scratch); while (num_entries) { struct page *page_table = ppgtt->gen8_pt_pages[pdpe][pde]; last_pte = pte + num_entries; if (last_pte > GEN8_PTES_PER_PAGE) last_pte = GEN8_PTES_PER_PAGE; pt_vaddr = kmap_atomic(page_table); for (i = pte; i < last_pte; i++) { pt_vaddr[i] = scratch_pte; num_entries--; } kunmap_atomic(pt_vaddr); pte = 0; if (++pde == GEN8_PDES_PER_PAGE) { pdpe++; pde = 0; } } } static void gen8_ppgtt_insert_entries(struct i915_address_space *vm, struct sg_table *pages, uint64_t start, enum i915_cache_level cache_level) { struct i915_hw_ppgtt *ppgtt = container_of(vm, struct i915_hw_ppgtt, base); gen8_gtt_pte_t *pt_vaddr; unsigned pdpe = start >> GEN8_PDPE_SHIFT & GEN8_PDPE_MASK; unsigned pde = start >> GEN8_PDE_SHIFT & GEN8_PDE_MASK; unsigned pte = start >> GEN8_PTE_SHIFT & GEN8_PTE_MASK; struct sg_page_iter sg_iter; pt_vaddr = NULL; for_each_sg_page(pages->sgl, &sg_iter, pages->nents, 0) { if (WARN_ON(pdpe >= GEN8_LEGACY_PDPS)) break; if (pt_vaddr == NULL) pt_vaddr = kmap_atomic(ppgtt->gen8_pt_pages[pdpe][pde]); pt_vaddr[pte] = gen8_pte_encode(sg_page_iter_dma_address(&sg_iter), cache_level, true); if (++pte == GEN8_PTES_PER_PAGE) { kunmap_atomic(pt_vaddr); pt_vaddr = NULL; if (++pde == GEN8_PDES_PER_PAGE) { pdpe++; pde = 0; } pte = 0; } } if (pt_vaddr) kunmap_atomic(pt_vaddr); } static void gen8_free_page_tables(struct page **pt_pages) { int i; if (pt_pages == NULL) return; for (i = 0; i < GEN8_PDES_PER_PAGE; i++) if (pt_pages[i]) __free_pages(pt_pages[i], 0); } static void gen8_ppgtt_free(const struct i915_hw_ppgtt *ppgtt) { int i; for (i = 0; i < ppgtt->num_pd_pages; i++) { gen8_free_page_tables(ppgtt->gen8_pt_pages[i]); kfree(ppgtt->gen8_pt_pages[i]); kfree(ppgtt->gen8_pt_dma_addr[i]); } __free_pages(ppgtt->pd_pages, get_order(ppgtt->num_pd_pages << PAGE_SHIFT)); } static void gen8_ppgtt_unmap_pages(struct i915_hw_ppgtt *ppgtt) { struct pci_dev *hwdev = ppgtt->base.dev->pdev; int i, j; for (i = 0; i < ppgtt->num_pd_pages; i++) { /* TODO: In the future we'll support sparse mappings, so this * will have to change. */ if (!ppgtt->pd_dma_addr[i]) continue; pci_unmap_page(hwdev, ppgtt->pd_dma_addr[i], PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); for (j = 0; j < GEN8_PDES_PER_PAGE; j++) { dma_addr_t addr = ppgtt->gen8_pt_dma_addr[i][j]; if (addr) pci_unmap_page(hwdev, addr, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); } } } static void gen8_ppgtt_cleanup(struct i915_address_space *vm) { struct i915_hw_ppgtt *ppgtt = container_of(vm, struct i915_hw_ppgtt, base); list_del(&vm->global_link); drm_mm_takedown(&vm->mm); gen8_ppgtt_unmap_pages(ppgtt); gen8_ppgtt_free(ppgtt); } static struct page **__gen8_alloc_page_tables(void) { struct page **pt_pages; int i; pt_pages = kcalloc(GEN8_PDES_PER_PAGE, sizeof(struct page *), GFP_KERNEL); if (!pt_pages) return ERR_PTR(-ENOMEM); for (i = 0; i < GEN8_PDES_PER_PAGE; i++) { pt_pages[i] = alloc_page(GFP_KERNEL); if (!pt_pages[i]) goto bail; } return pt_pages; bail: gen8_free_page_tables(pt_pages); kfree(pt_pages); return ERR_PTR(-ENOMEM); } static int gen8_ppgtt_allocate_page_tables(struct i915_hw_ppgtt *ppgtt, const int max_pdp) { struct page **pt_pages[GEN8_LEGACY_PDPS]; int i, ret; for (i = 0; i < max_pdp; i++) { pt_pages[i] = __gen8_alloc_page_tables(); if (IS_ERR(pt_pages[i])) { ret = PTR_ERR(pt_pages[i]); goto unwind_out; } } /* NB: Avoid touching gen8_pt_pages until last to keep the allocation, * "atomic" - for cleanup purposes. */ for (i = 0; i < max_pdp; i++) ppgtt->gen8_pt_pages[i] = pt_pages[i]; return 0; unwind_out: while (i--) { gen8_free_page_tables(pt_pages[i]); kfree(pt_pages[i]); } return ret; } static int gen8_ppgtt_allocate_dma(struct i915_hw_ppgtt *ppgtt) { int i; for (i = 0; i < ppgtt->num_pd_pages; i++) { ppgtt->gen8_pt_dma_addr[i] = kcalloc(GEN8_PDES_PER_PAGE, sizeof(dma_addr_t), GFP_KERNEL); if (!ppgtt->gen8_pt_dma_addr[i]) return -ENOMEM; } return 0; } static int gen8_ppgtt_allocate_page_directories(struct i915_hw_ppgtt *ppgtt, const int max_pdp) { ppgtt->pd_pages = alloc_pages(GFP_KERNEL, get_order(max_pdp << PAGE_SHIFT)); if (!ppgtt->pd_pages) return -ENOMEM; ppgtt->num_pd_pages = 1 << get_order(max_pdp << PAGE_SHIFT); BUG_ON(ppgtt->num_pd_pages > GEN8_LEGACY_PDPS); return 0; } static int gen8_ppgtt_alloc(struct i915_hw_ppgtt *ppgtt, const int max_pdp) { int ret; ret = gen8_ppgtt_allocate_page_directories(ppgtt, max_pdp); if (ret) return ret; ret = gen8_ppgtt_allocate_page_tables(ppgtt, max_pdp); if (ret) { __free_pages(ppgtt->pd_pages, get_order(max_pdp << PAGE_SHIFT)); return ret; } ppgtt->num_pd_entries = max_pdp * GEN8_PDES_PER_PAGE; ret = gen8_ppgtt_allocate_dma(ppgtt); if (ret) gen8_ppgtt_free(ppgtt); return ret; } static int gen8_ppgtt_setup_page_directories(struct i915_hw_ppgtt *ppgtt, const int pd) { dma_addr_t pd_addr; int ret; pd_addr = pci_map_page(ppgtt->base.dev->pdev, &ppgtt->pd_pages[pd], 0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); ret = pci_dma_mapping_error(ppgtt->base.dev->pdev, pd_addr); if (ret) return ret; ppgtt->pd_dma_addr[pd] = pd_addr; return 0; } static int gen8_ppgtt_setup_page_tables(struct i915_hw_ppgtt *ppgtt, const int pd, const int pt) { dma_addr_t pt_addr; struct page *p; int ret; p = ppgtt->gen8_pt_pages[pd][pt]; pt_addr = pci_map_page(ppgtt->base.dev->pdev, p, 0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); ret = pci_dma_mapping_error(ppgtt->base.dev->pdev, pt_addr); if (ret) return ret; ppgtt->gen8_pt_dma_addr[pd][pt] = pt_addr; return 0; } /** * GEN8 legacy ppgtt programming is accomplished through a max 4 PDP registers * with a net effect resembling a 2-level page table in normal x86 terms. Each * PDP represents 1GB of memory 4 * 512 * 512 * 4096 = 4GB legacy 32b address * space. * * FIXME: split allocation into smaller pieces. For now we only ever do this * once, but with full PPGTT, the multiple contiguous allocations will be bad. * TODO: Do something with the size parameter */ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt, uint64_t size) { const int max_pdp = DIV_ROUND_UP(size, 1 << 30); const int min_pt_pages = GEN8_PDES_PER_PAGE * max_pdp; int i, j, ret; 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); if (ret) return ret; /* * 2. Create DMA mappings for the page directories and page tables. */ for (i = 0; i < max_pdp; i++) { ret = gen8_ppgtt_setup_page_directories(ppgtt, i); if (ret) goto bail; for (j = 0; j < GEN8_PDES_PER_PAGE; j++) { ret = gen8_ppgtt_setup_page_tables(ppgtt, i, j); if (ret) goto bail; } } /* * 3. Map all the page directory entires to point to the page tables * we've allocated. * * For now, the PPGTT helper functions all require that the PDEs are * 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++) { gen8_ppgtt_pde_t *pd_vaddr; pd_vaddr = kmap_atomic(&ppgtt->pd_pages[i]); for (j = 0; j < GEN8_PDES_PER_PAGE; j++) { dma_addr_t addr = ppgtt->gen8_pt_dma_addr[i][j]; pd_vaddr[j] = gen8_pde_encode(ppgtt->base.dev, addr, I915_CACHE_LLC); } kunmap_atomic(pd_vaddr); } ppgtt->enable = gen8_ppgtt_enable; ppgtt->switch_mm = gen8_mm_switch; ppgtt->base.clear_range = gen8_ppgtt_clear_range; 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); DRM_DEBUG_DRIVER("Allocated %d pages for page directories (%d wasted)\n", ppgtt->num_pd_pages, ppgtt->num_pd_pages - max_pdp); DRM_DEBUG_DRIVER("Allocated %d pages for page tables (%lld wasted)\n", ppgtt->num_pd_entries, (ppgtt->num_pd_entries - min_pt_pages) + size % (1<<30)); return 0; bail: gen8_ppgtt_unmap_pages(ppgtt); gen8_ppgtt_free(ppgtt); return ret; } static void gen6_dump_ppgtt(struct i915_hw_ppgtt *ppgtt, struct seq_file *m) { struct drm_i915_private *dev_priv = ppgtt->base.dev->dev_private; struct i915_address_space *vm = &ppgtt->base; gen6_gtt_pte_t __iomem *pd_addr; gen6_gtt_pte_t scratch_pte; uint32_t pd_entry; int pte, pde; scratch_pte = vm->pte_encode(vm->scratch.addr, I915_CACHE_LLC, true); pd_addr = (gen6_gtt_pte_t __iomem *)dev_priv->gtt.gsm + ppgtt->pd_offset / sizeof(gen6_gtt_pte_t); seq_printf(m, " VM %p (pd_offset %x-%x):\n", vm, ppgtt->pd_offset, ppgtt->pd_offset + ppgtt->num_pd_entries); for (pde = 0; pde < ppgtt->num_pd_entries; pde++) { u32 expected; gen6_gtt_pte_t *pt_vaddr; dma_addr_t pt_addr = ppgtt->pt_dma_addr[pde]; pd_entry = readl(pd_addr + pde); expected = (GEN6_PDE_ADDR_ENCODE(pt_addr) | GEN6_PDE_VALID); if (pd_entry != expected) seq_printf(m, "\tPDE #%d mismatch: Actual PDE: %x Expected PDE: %x\n", pde, pd_entry, expected); seq_printf(m, "\tPDE: %x\n", pd_entry); pt_vaddr = kmap_atomic(ppgtt->pt_pages[pde]); for (pte = 0; pte < I915_PPGTT_PT_ENTRIES; pte+=4) { unsigned long va = (pde * PAGE_SIZE * I915_PPGTT_PT_ENTRIES) + (pte * PAGE_SIZE); int i; bool found = false; for (i = 0; i < 4; i++) if (pt_vaddr[pte + i] != scratch_pte) found = true; if (!found) continue; seq_printf(m, "\t\t0x%lx [%03d,%04d]: =", va, pde, pte); for (i = 0; i < 4; i++) { if (pt_vaddr[pte + i] != scratch_pte) seq_printf(m, " %08x", pt_vaddr[pte + i]); else seq_puts(m, " SCRATCH "); } seq_puts(m, "\n"); } kunmap_atomic(pt_vaddr); } } static void gen6_write_pdes(struct i915_hw_ppgtt *ppgtt) { struct drm_i915_private *dev_priv = ppgtt->base.dev->dev_private; gen6_gtt_pte_t __iomem *pd_addr; uint32_t pd_entry; int i; WARN_ON(ppgtt->pd_offset & 0x3f); pd_addr = (gen6_gtt_pte_t __iomem*)dev_priv->gtt.gsm + ppgtt->pd_offset / sizeof(gen6_gtt_pte_t); for (i = 0; i < ppgtt->num_pd_entries; i++) { dma_addr_t pt_addr; pt_addr = ppgtt->pt_dma_addr[i]; pd_entry = GEN6_PDE_ADDR_ENCODE(pt_addr); pd_entry |= GEN6_PDE_VALID; writel(pd_entry, pd_addr + i); } readl(pd_addr); } static uint32_t get_pd_offset(struct i915_hw_ppgtt *ppgtt) { BUG_ON(ppgtt->pd_offset & 0x3f); return (ppgtt->pd_offset / 64) << 16; } static int hsw_mm_switch(struct i915_hw_ppgtt *ppgtt, struct intel_ring_buffer *ring, bool synchronous) { struct drm_device *dev = ppgtt->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; int ret; /* If we're in reset, we can assume the GPU is sufficiently idle to * manually frob these bits. Ideally we could use the ring functions, * except our error handling makes it quite difficult (can't use * intel_ring_begin, ring->flush, or intel_ring_advance) * * FIXME: We should try not to special case reset */ if (synchronous || i915_reset_in_progress(&dev_priv->gpu_error)) { WARN_ON(ppgtt != dev_priv->mm.aliasing_ppgtt); I915_WRITE(RING_PP_DIR_DCLV(ring), PP_DIR_DCLV_2G); I915_WRITE(RING_PP_DIR_BASE(ring), get_pd_offset(ppgtt)); POSTING_READ(RING_PP_DIR_BASE(ring)); return 0; } /* NB: TLBs must be flushed and invalidated before a switch */ ret = ring->flush(ring, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS); if (ret) return ret; ret = intel_ring_begin(ring, 6); if (ret) return ret; intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(2)); intel_ring_emit(ring, RING_PP_DIR_DCLV(ring)); intel_ring_emit(ring, PP_DIR_DCLV_2G); intel_ring_emit(ring, RING_PP_DIR_BASE(ring)); intel_ring_emit(ring, get_pd_offset(ppgtt)); intel_ring_emit(ring, MI_NOOP); intel_ring_advance(ring); return 0; } static int gen7_mm_switch(struct i915_hw_ppgtt *ppgtt, struct intel_ring_buffer *ring, bool synchronous) { struct drm_device *dev = ppgtt->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; int ret; /* If we're in reset, we can assume the GPU is sufficiently idle to * manually frob these bits. Ideally we could use the ring functions, * except our error handling makes it quite difficult (can't use * intel_ring_begin, ring->flush, or intel_ring_advance) * * FIXME: We should try not to special case reset */ if (synchronous || i915_reset_in_progress(&dev_priv->gpu_error)) { WARN_ON(ppgtt != dev_priv->mm.aliasing_ppgtt); I915_WRITE(RING_PP_DIR_DCLV(ring), PP_DIR_DCLV_2G); I915_WRITE(RING_PP_DIR_BASE(ring), get_pd_offset(ppgtt)); POSTING_READ(RING_PP_DIR_BASE(ring)); return 0; } /* NB: TLBs must be flushed and invalidated before a switch */ ret = ring->flush(ring, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS); if (ret) return ret; ret = intel_ring_begin(ring, 6); if (ret) return ret; intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(2)); intel_ring_emit(ring, RING_PP_DIR_DCLV(ring)); intel_ring_emit(ring, PP_DIR_DCLV_2G); intel_ring_emit(ring, RING_PP_DIR_BASE(ring)); intel_ring_emit(ring, get_pd_offset(ppgtt)); intel_ring_emit(ring, MI_NOOP); intel_ring_advance(ring); /* XXX: RCS is the only one to auto invalidate the TLBs? */ if (ring->id != RCS) { ret = ring->flush(ring, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS); if (ret) return ret; } return 0; } static int gen6_mm_switch(struct i915_hw_ppgtt *ppgtt, struct intel_ring_buffer *ring, bool synchronous) { struct drm_device *dev = ppgtt->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; if (!synchronous) return 0; I915_WRITE(RING_PP_DIR_DCLV(ring), PP_DIR_DCLV_2G); I915_WRITE(RING_PP_DIR_BASE(ring), get_pd_offset(ppgtt)); POSTING_READ(RING_PP_DIR_DCLV(ring)); return 0; } static int gen8_ppgtt_enable(struct i915_hw_ppgtt *ppgtt) { struct drm_device *dev = ppgtt->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; struct intel_ring_buffer *ring; int j, ret; for_each_ring(ring, dev_priv, j) { I915_WRITE(RING_MODE_GEN7(ring), _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE)); /* We promise to do a switch later with FULL PPGTT. If this is * aliasing, this is the one and only switch we'll do */ if (USES_FULL_PPGTT(dev)) continue; ret = ppgtt->switch_mm(ppgtt, ring, true); if (ret) goto err_out; } return 0; err_out: for_each_ring(ring, dev_priv, j) I915_WRITE(RING_MODE_GEN7(ring), _MASKED_BIT_DISABLE(GFX_PPGTT_ENABLE)); return ret; } static int gen7_ppgtt_enable(struct i915_hw_ppgtt *ppgtt) { struct drm_device *dev = ppgtt->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; struct intel_ring_buffer *ring; uint32_t ecochk, ecobits; int i; ecobits = I915_READ(GAC_ECO_BITS); I915_WRITE(GAC_ECO_BITS, ecobits | ECOBITS_PPGTT_CACHE64B); ecochk = I915_READ(GAM_ECOCHK); if (IS_HASWELL(dev)) { ecochk |= ECOCHK_PPGTT_WB_HSW; } else { ecochk |= ECOCHK_PPGTT_LLC_IVB; ecochk &= ~ECOCHK_PPGTT_GFDT_IVB; } I915_WRITE(GAM_ECOCHK, ecochk); for_each_ring(ring, dev_priv, i) { int ret; /* GFX_MODE is per-ring on gen7+ */ I915_WRITE(RING_MODE_GEN7(ring), _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE)); /* We promise to do a switch later with FULL PPGTT. If this is * aliasing, this is the one and only switch we'll do */ if (USES_FULL_PPGTT(dev)) continue; ret = ppgtt->switch_mm(ppgtt, ring, true); if (ret) return ret; } return 0; } static int gen6_ppgtt_enable(struct i915_hw_ppgtt *ppgtt) { struct drm_device *dev = ppgtt->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; struct intel_ring_buffer *ring; uint32_t ecochk, gab_ctl, ecobits; int i; ecobits = I915_READ(GAC_ECO_BITS); I915_WRITE(GAC_ECO_BITS, ecobits | ECOBITS_SNB_BIT | ECOBITS_PPGTT_CACHE64B); gab_ctl = I915_READ(GAB_CTL); I915_WRITE(GAB_CTL, gab_ctl | GAB_CTL_CONT_AFTER_PAGEFAULT); ecochk = I915_READ(GAM_ECOCHK); I915_WRITE(GAM_ECOCHK, ecochk | ECOCHK_SNB_BIT | ECOCHK_PPGTT_CACHE64B); I915_WRITE(GFX_MODE, _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE)); for_each_ring(ring, dev_priv, i) { int ret = ppgtt->switch_mm(ppgtt, ring, true); if (ret) return ret; } return 0; } /* PPGTT support for Sandybdrige/Gen6 and later */ static void gen6_ppgtt_clear_range(struct i915_address_space *vm, uint64_t start, uint64_t length, bool use_scratch) { struct i915_hw_ppgtt *ppgtt = container_of(vm, struct i915_hw_ppgtt, base); gen6_gtt_pte_t *pt_vaddr, scratch_pte; unsigned first_entry = start >> PAGE_SHIFT; unsigned num_entries = length >> PAGE_SHIFT; unsigned act_pt = first_entry / I915_PPGTT_PT_ENTRIES; unsigned first_pte = first_entry % I915_PPGTT_PT_ENTRIES; unsigned last_pte, i; scratch_pte = vm->pte_encode(vm->scratch.addr, I915_CACHE_LLC, true); while (num_entries) { last_pte = first_pte + num_entries; if (last_pte > I915_PPGTT_PT_ENTRIES) last_pte = I915_PPGTT_PT_ENTRIES; pt_vaddr = kmap_atomic(ppgtt->pt_pages[act_pt]); for (i = first_pte; i < last_pte; i++) pt_vaddr[i] = scratch_pte; kunmap_atomic(pt_vaddr); num_entries -= last_pte - first_pte; first_pte = 0; act_pt++; } } static void gen6_ppgtt_insert_entries(struct i915_address_space *vm, struct sg_table *pages, uint64_t start, enum i915_cache_level cache_level) { struct i915_hw_ppgtt *ppgtt = container_of(vm, struct i915_hw_ppgtt, base); gen6_gtt_pte_t *pt_vaddr; unsigned first_entry = start >> PAGE_SHIFT; unsigned act_pt = first_entry / I915_PPGTT_PT_ENTRIES; unsigned act_pte = first_entry % I915_PPGTT_PT_ENTRIES; struct sg_page_iter sg_iter; pt_vaddr = NULL; for_each_sg_page(pages->sgl, &sg_iter, pages->nents, 0) { if (pt_vaddr == NULL) pt_vaddr = kmap_atomic(ppgtt->pt_pages[act_pt]); pt_vaddr[act_pte] = vm->pte_encode(sg_page_iter_dma_address(&sg_iter), cache_level, true); if (++act_pte == I915_PPGTT_PT_ENTRIES) { kunmap_atomic(pt_vaddr); pt_vaddr = NULL; act_pt++; act_pte = 0; } } if (pt_vaddr) kunmap_atomic(pt_vaddr); } static void gen6_ppgtt_unmap_pages(struct i915_hw_ppgtt *ppgtt) { int i; if (ppgtt->pt_dma_addr) { for (i = 0; i < ppgtt->num_pd_entries; i++) pci_unmap_page(ppgtt->base.dev->pdev, ppgtt->pt_dma_addr[i], 4096, PCI_DMA_BIDIRECTIONAL); } } static void gen6_ppgtt_free(struct i915_hw_ppgtt *ppgtt) { int i; kfree(ppgtt->pt_dma_addr); for (i = 0; i < ppgtt->num_pd_entries; i++) __free_page(ppgtt->pt_pages[i]); kfree(ppgtt->pt_pages); } static void gen6_ppgtt_cleanup(struct i915_address_space *vm) { struct i915_hw_ppgtt *ppgtt = container_of(vm, struct i915_hw_ppgtt, base); list_del(&vm->global_link); drm_mm_takedown(&ppgtt->base.mm); drm_mm_remove_node(&ppgtt->node); gen6_ppgtt_unmap_pages(ppgtt); gen6_ppgtt_free(ppgtt); } static int gen6_ppgtt_allocate_page_directories(struct i915_hw_ppgtt *ppgtt) { struct drm_device *dev = ppgtt->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; bool retried = false; int ret; /* PPGTT PDEs reside in the GGTT and consists of 512 entries. The * allocator works in address space sizes, so it's multiplied by page * size. We allocate at the top of the GTT to avoid fragmentation. */ BUG_ON(!drm_mm_initialized(&dev_priv->gtt.base.mm)); alloc: ret = drm_mm_insert_node_in_range_generic(&dev_priv->gtt.base.mm, &ppgtt->node, GEN6_PD_SIZE, GEN6_PD_ALIGN, 0, 0, dev_priv->gtt.base.total, DRM_MM_SEARCH_DEFAULT, DRM_MM_CREATE_DEFAULT); if (ret == -ENOSPC && !retried) { ret = i915_gem_evict_something(dev, &dev_priv->gtt.base, GEN6_PD_SIZE, GEN6_PD_ALIGN, I915_CACHE_NONE, 0); if (ret) return ret; retried = true; goto alloc; } if (ppgtt->node.start < dev_priv->gtt.mappable_end) DRM_DEBUG("Forced to use aperture for PDEs\n"); ppgtt->num_pd_entries = GEN6_PPGTT_PD_ENTRIES; return ret; } static int gen6_ppgtt_allocate_page_tables(struct i915_hw_ppgtt *ppgtt) { int i; ppgtt->pt_pages = kcalloc(ppgtt->num_pd_entries, sizeof(struct page *), GFP_KERNEL); if (!ppgtt->pt_pages) return -ENOMEM; for (i = 0; i < ppgtt->num_pd_entries; i++) { ppgtt->pt_pages[i] = alloc_page(GFP_KERNEL); if (!ppgtt->pt_pages[i]) { gen6_ppgtt_free(ppgtt); return -ENOMEM; } } return 0; } static int gen6_ppgtt_alloc(struct i915_hw_ppgtt *ppgtt) { int ret; ret = gen6_ppgtt_allocate_page_directories(ppgtt); if (ret) return ret; ret = gen6_ppgtt_allocate_page_tables(ppgtt); if (ret) { drm_mm_remove_node(&ppgtt->node); return ret; } ppgtt->pt_dma_addr = kcalloc(ppgtt->num_pd_entries, sizeof(dma_addr_t), GFP_KERNEL); if (!ppgtt->pt_dma_addr) { drm_mm_remove_node(&ppgtt->node); gen6_ppgtt_free(ppgtt); return -ENOMEM; } return 0; } static int gen6_ppgtt_setup_page_tables(struct i915_hw_ppgtt *ppgtt) { struct drm_device *dev = ppgtt->base.dev; int i; for (i = 0; i < ppgtt->num_pd_entries; i++) { dma_addr_t pt_addr; pt_addr = pci_map_page(dev->pdev, ppgtt->pt_pages[i], 0, 4096, PCI_DMA_BIDIRECTIONAL); if (pci_dma_mapping_error(dev->pdev, pt_addr)) { gen6_ppgtt_unmap_pages(ppgtt); return -EIO; } ppgtt->pt_dma_addr[i] = pt_addr; } return 0; } static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt) { struct drm_device *dev = ppgtt->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; int ret; ppgtt->base.pte_encode = dev_priv->gtt.base.pte_encode; if (IS_GEN6(dev)) { ppgtt->enable = gen6_ppgtt_enable; ppgtt->switch_mm = gen6_mm_switch; } else if (IS_HASWELL(dev)) { ppgtt->enable = gen7_ppgtt_enable; ppgtt->switch_mm = hsw_mm_switch; } else if (IS_GEN7(dev)) { ppgtt->enable = gen7_ppgtt_enable; ppgtt->switch_mm = gen7_mm_switch; } else BUG(); ret = gen6_ppgtt_alloc(ppgtt); if (ret) return ret; ret = gen6_ppgtt_setup_page_tables(ppgtt); if (ret) { gen6_ppgtt_free(ppgtt); return ret; } ppgtt->base.clear_range = gen6_ppgtt_clear_range; ppgtt->base.insert_entries = gen6_ppgtt_insert_entries; ppgtt->base.cleanup = gen6_ppgtt_cleanup; ppgtt->base.start = 0; ppgtt->base.total = ppgtt->num_pd_entries * I915_PPGTT_PT_ENTRIES * PAGE_SIZE; ppgtt->debug_dump = gen6_dump_ppgtt; ppgtt->pd_offset = ppgtt->node.start / PAGE_SIZE * sizeof(gen6_gtt_pte_t); ppgtt->base.clear_range(&ppgtt->base, 0, ppgtt->base.total, true); DRM_DEBUG_DRIVER("Allocated pde space (%ldM) at GTT entry: %lx\n", ppgtt->node.size >> 20, ppgtt->node.start / PAGE_SIZE); return 0; } int i915_gem_init_ppgtt(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt) { struct drm_i915_private *dev_priv = dev->dev_private; int ret = 0; ppgtt->base.dev = dev; ppgtt->base.scratch = dev_priv->gtt.base.scratch; if (INTEL_INFO(dev)->gen < 8) ret = gen6_ppgtt_init(ppgtt); else if (IS_GEN8(dev)) ret = gen8_ppgtt_init(ppgtt, dev_priv->gtt.base.total); else BUG(); if (!ret) { struct drm_i915_private *dev_priv = dev->dev_private; kref_init(&ppgtt->ref); drm_mm_init(&ppgtt->base.mm, ppgtt->base.start, ppgtt->base.total); i915_init_vm(dev_priv, &ppgtt->base); if (INTEL_INFO(dev)->gen < 8) { gen6_write_pdes(ppgtt); DRM_DEBUG("Adding PPGTT at offset %x\n", ppgtt->pd_offset << 10); } } return ret; } static void ppgtt_bind_vma(struct i915_vma *vma, enum i915_cache_level cache_level, u32 flags) { vma->vm->insert_entries(vma->vm, vma->obj->pages, vma->node.start, cache_level); } static void ppgtt_unbind_vma(struct i915_vma *vma) { vma->vm->clear_range(vma->vm, vma->node.start, vma->obj->base.size, true); } extern int intel_iommu_gfx_mapped; /* Certain Gen5 chipsets require require idling the GPU before * unmapping anything from the GTT when VT-d is enabled. */ static inline bool needs_idle_maps(struct drm_device *dev) { #ifdef CONFIG_INTEL_IOMMU /* Query intel_iommu to see if we need the workaround. Presumably that * was loaded first. */ if (IS_GEN5(dev) && IS_MOBILE(dev) && intel_iommu_gfx_mapped) return true; #endif return false; } static bool do_idling(struct drm_i915_private *dev_priv) { bool ret = dev_priv->mm.interruptible; if (unlikely(dev_priv->gtt.do_idle_maps)) { dev_priv->mm.interruptible = false; if (i915_gpu_idle(dev_priv->dev)) { DRM_ERROR("Couldn't idle GPU\n"); /* Wait a bit, in hopes it avoids the hang */ udelay(10); } } return ret; } static void undo_idling(struct drm_i915_private *dev_priv, bool interruptible) { if (unlikely(dev_priv->gtt.do_idle_maps)) dev_priv->mm.interruptible = interruptible; } void i915_check_and_clear_faults(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_ring_buffer *ring; int i; if (INTEL_INFO(dev)->gen < 6) return; for_each_ring(ring, dev_priv, i) { u32 fault_reg; fault_reg = I915_READ(RING_FAULT_REG(ring)); if (fault_reg & RING_FAULT_VALID) { DRM_DEBUG_DRIVER("Unexpected fault\n" "\tAddr: 0x%08lx\\n" "\tAddress space: %s\n" "\tSource ID: %d\n" "\tType: %d\n", fault_reg & PAGE_MASK, fault_reg & RING_FAULT_GTTSEL_MASK ? "GGTT" : "PPGTT", RING_FAULT_SRCID(fault_reg), RING_FAULT_FAULT_TYPE(fault_reg)); I915_WRITE(RING_FAULT_REG(ring), fault_reg & ~RING_FAULT_VALID); } } POSTING_READ(RING_FAULT_REG(&dev_priv->ring[RCS])); } void i915_gem_suspend_gtt_mappings(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; /* Don't bother messing with faults pre GEN6 as we have little * documentation supporting that it's a good idea. */ if (INTEL_INFO(dev)->gen < 6) return; i915_check_and_clear_faults(dev); dev_priv->gtt.base.clear_range(&dev_priv->gtt.base, dev_priv->gtt.base.start, dev_priv->gtt.base.total, true); } void i915_gem_restore_gtt_mappings(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct drm_i915_gem_object *obj; struct i915_address_space *vm; i915_check_and_clear_faults(dev); /* First fill our portion of the GTT with scratch pages */ dev_priv->gtt.base.clear_range(&dev_priv->gtt.base, dev_priv->gtt.base.start, dev_priv->gtt.base.total, true); list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) { struct i915_vma *vma = i915_gem_obj_to_vma(obj, &dev_priv->gtt.base); if (!vma) continue; i915_gem_clflush_object(obj, obj->pin_display); /* The bind_vma code tries to be smart about tracking mappings. * Unfortunately above, we've just wiped out the mappings * without telling our object about it. So we need to fake it. */ obj->has_global_gtt_mapping = 0; vma->bind_vma(vma, obj->cache_level, GLOBAL_BIND); } if (INTEL_INFO(dev)->gen >= 8) { gen8_setup_private_ppat(dev_priv); return; } list_for_each_entry(vm, &dev_priv->vm_list, global_link) { /* TODO: Perhaps it shouldn't be gen6 specific */ if (i915_is_ggtt(vm)) { if (dev_priv->mm.aliasing_ppgtt) gen6_write_pdes(dev_priv->mm.aliasing_ppgtt); continue; } gen6_write_pdes(container_of(vm, struct i915_hw_ppgtt, base)); } i915_gem_chipset_flush(dev); } int i915_gem_gtt_prepare_object(struct drm_i915_gem_object *obj) { if (obj->has_dma_mapping) return 0; if (!dma_map_sg(&obj->base.dev->pdev->dev, obj->pages->sgl, obj->pages->nents, PCI_DMA_BIDIRECTIONAL)) return -ENOSPC; return 0; } static inline void gen8_set_pte(void __iomem *addr, gen8_gtt_pte_t pte) { #ifdef writeq writeq(pte, addr); #else iowrite32((u32)pte, addr); iowrite32(pte >> 32, addr + 4); #endif } static void gen8_ggtt_insert_entries(struct i915_address_space *vm, struct sg_table *st, uint64_t start, enum i915_cache_level level) { struct drm_i915_private *dev_priv = vm->dev->dev_private; unsigned first_entry = start >> PAGE_SHIFT; gen8_gtt_pte_t __iomem *gtt_entries = (gen8_gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry; int i = 0; struct sg_page_iter sg_iter; dma_addr_t addr = 0; for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) { addr = sg_dma_address(sg_iter.sg) + (sg_iter.sg_pgoffset << PAGE_SHIFT); gen8_set_pte(>t_entries[i], gen8_pte_encode(addr, level, true)); i++; } /* * XXX: This serves as a posting read to make sure that the PTE has * actually been updated. There is some concern that even though * registers and PTEs are within the same BAR that they are potentially * of NUMA access patterns. Therefore, even with the way we assume * hardware should work, we must keep this posting read for paranoia. */ if (i != 0) WARN_ON(readq(>t_entries[i-1]) != gen8_pte_encode(addr, level, true)); /* This next bit makes the above posting read even more important. We * want to flush the TLBs only after we're certain all the PTE updates * have finished. */ I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN); POSTING_READ(GFX_FLSH_CNTL_GEN6); } /* * Binds an object into the global gtt with the specified cache level. The object * will be accessible to the GPU via commands whose operands reference offsets * within the global GTT as well as accessible by the GPU through the GMADR * mapped BAR (dev_priv->mm.gtt->gtt). */ static void gen6_ggtt_insert_entries(struct i915_address_space *vm, struct sg_table *st, uint64_t start, enum i915_cache_level level) { struct drm_i915_private *dev_priv = vm->dev->dev_private; unsigned first_entry = start >> PAGE_SHIFT; gen6_gtt_pte_t __iomem *gtt_entries = (gen6_gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry; int i = 0; struct sg_page_iter sg_iter; dma_addr_t addr; for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) { addr = sg_page_iter_dma_address(&sg_iter); iowrite32(vm->pte_encode(addr, level, true), >t_entries[i]); i++; } /* XXX: This serves as a posting read to make sure that the PTE has * actually been updated. There is some concern that even though * registers and PTEs are within the same BAR that they are potentially * of NUMA access patterns. Therefore, even with the way we assume * hardware should work, we must keep this posting read for paranoia. */ if (i != 0) WARN_ON(readl(>t_entries[i-1]) != vm->pte_encode(addr, level, true)); /* This next bit makes the above posting read even more important. We * want to flush the TLBs only after we're certain all the PTE updates * have finished. */ I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN); POSTING_READ(GFX_FLSH_CNTL_GEN6); } static void gen8_ggtt_clear_range(struct i915_address_space *vm, uint64_t start, uint64_t length, bool use_scratch) { struct drm_i915_private *dev_priv = vm->dev->dev_private; unsigned first_entry = start >> PAGE_SHIFT; unsigned num_entries = length >> PAGE_SHIFT; gen8_gtt_pte_t scratch_pte, __iomem *gtt_base = (gen8_gtt_pte_t __iomem *) dev_priv->gtt.gsm + first_entry; const int max_entries = gtt_total_entries(dev_priv->gtt) - first_entry; int i; if (WARN(num_entries > max_entries, "First entry = %d; Num entries = %d (max=%d)\n", first_entry, num_entries, max_entries)) num_entries = max_entries; scratch_pte = gen8_pte_encode(vm->scratch.addr, I915_CACHE_LLC, use_scratch); for (i = 0; i < num_entries; i++) gen8_set_pte(>t_base[i], scratch_pte); readl(gtt_base); } static void gen6_ggtt_clear_range(struct i915_address_space *vm, uint64_t start, uint64_t length, bool use_scratch) { struct drm_i915_private *dev_priv = vm->dev->dev_private; unsigned first_entry = start >> PAGE_SHIFT; unsigned num_entries = length >> PAGE_SHIFT; gen6_gtt_pte_t scratch_pte, __iomem *gtt_base = (gen6_gtt_pte_t __iomem *) dev_priv->gtt.gsm + first_entry; const int max_entries = gtt_total_entries(dev_priv->gtt) - first_entry; int i; if (WARN(num_entries > max_entries, "First entry = %d; Num entries = %d (max=%d)\n", first_entry, num_entries, max_entries)) num_entries = max_entries; scratch_pte = vm->pte_encode(vm->scratch.addr, I915_CACHE_LLC, use_scratch); for (i = 0; i < num_entries; i++) iowrite32(scratch_pte, >t_base[i]); readl(gtt_base); } static void i915_ggtt_bind_vma(struct i915_vma *vma, enum i915_cache_level cache_level, u32 unused) { const unsigned long entry = vma->node.start >> PAGE_SHIFT; unsigned int flags = (cache_level == I915_CACHE_NONE) ? AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY; BUG_ON(!i915_is_ggtt(vma->vm)); intel_gtt_insert_sg_entries(vma->obj->pages, entry, flags); vma->obj->has_global_gtt_mapping = 1; } static void i915_ggtt_clear_range(struct i915_address_space *vm, uint64_t start, uint64_t length, bool unused) { unsigned first_entry = start >> PAGE_SHIFT; unsigned num_entries = length >> PAGE_SHIFT; intel_gtt_clear_range(first_entry, num_entries); } static void i915_ggtt_unbind_vma(struct i915_vma *vma) { const unsigned int first = vma->node.start >> PAGE_SHIFT; const unsigned int size = vma->obj->base.size >> PAGE_SHIFT; BUG_ON(!i915_is_ggtt(vma->vm)); vma->obj->has_global_gtt_mapping = 0; intel_gtt_clear_range(first, size); } static void ggtt_bind_vma(struct i915_vma *vma, enum i915_cache_level cache_level, u32 flags) { struct drm_device *dev = vma->vm->dev; struct drm_i915_private *dev_priv = dev->dev_private; struct drm_i915_gem_object *obj = vma->obj; /* If there is no aliasing PPGTT, or the caller needs a global mapping, * or we have a global mapping already but the cacheability flags have * changed, set the global PTEs. * * If there is an aliasing PPGTT it is anecdotally faster, so use that * instead if none of the above hold true. * * NB: A global mapping should only be needed for special regions like * "gtt mappable", SNB errata, or if specified via special execbuf * flags. At all other times, the GPU will use the aliasing PPGTT. */ if (!dev_priv->mm.aliasing_ppgtt || flags & GLOBAL_BIND) { if (!obj->has_global_gtt_mapping || (cache_level != obj->cache_level)) { vma->vm->insert_entries(vma->vm, obj->pages, vma->node.start, cache_level); obj->has_global_gtt_mapping = 1; } } if (dev_priv->mm.aliasing_ppgtt && (!obj->has_aliasing_ppgtt_mapping || (cache_level != obj->cache_level))) { struct i915_hw_ppgtt *appgtt = dev_priv->mm.aliasing_ppgtt; appgtt->base.insert_entries(&appgtt->base, vma->obj->pages, vma->node.start, cache_level); vma->obj->has_aliasing_ppgtt_mapping = 1; } } static void ggtt_unbind_vma(struct i915_vma *vma) { struct drm_device *dev = vma->vm->dev; struct drm_i915_private *dev_priv = dev->dev_private; struct drm_i915_gem_object *obj = vma->obj; if (obj->has_global_gtt_mapping) { vma->vm->clear_range(vma->vm, vma->node.start, obj->base.size, true); obj->has_global_gtt_mapping = 0; } if (obj->has_aliasing_ppgtt_mapping) { struct i915_hw_ppgtt *appgtt = dev_priv->mm.aliasing_ppgtt; appgtt->base.clear_range(&appgtt->base, vma->node.start, obj->base.size, true); obj->has_aliasing_ppgtt_mapping = 0; } } void i915_gem_gtt_finish_object(struct drm_i915_gem_object *obj) { struct drm_device *dev = obj->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; bool interruptible; interruptible = do_idling(dev_priv); if (!obj->has_dma_mapping) dma_unmap_sg(&dev->pdev->dev, obj->pages->sgl, obj->pages->nents, PCI_DMA_BIDIRECTIONAL); undo_idling(dev_priv, interruptible); } static void i915_gtt_color_adjust(struct drm_mm_node *node, unsigned long color, unsigned long *start, unsigned long *end) { if (node->color != color) *start += 4096; if (!list_empty(&node->node_list)) { node = list_entry(node->node_list.next, struct drm_mm_node, node_list); if (node->allocated && node->color != color) *end -= 4096; } } void i915_gem_setup_global_gtt(struct drm_device *dev, unsigned long start, unsigned long mappable_end, unsigned long end) { /* Let GEM Manage all of the aperture. * * However, leave one page at the end still bound to the scratch page. * There are a number of places where the hardware apparently prefetches * past the end of the object, and we've seen multiple hangs with the * GPU head pointer stuck in a batchbuffer bound at the last page of the * aperture. One page should be enough to keep any prefetching inside * of the aperture. */ struct drm_i915_private *dev_priv = dev->dev_private; struct i915_address_space *ggtt_vm = &dev_priv->gtt.base; struct drm_mm_node *entry; struct drm_i915_gem_object *obj; unsigned long hole_start, hole_end; BUG_ON(mappable_end > end); /* Subtract the guard page ... */ drm_mm_init(&ggtt_vm->mm, start, end - start - PAGE_SIZE); if (!HAS_LLC(dev)) dev_priv->gtt.base.mm.color_adjust = i915_gtt_color_adjust; /* Mark any preallocated objects as occupied */ list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) { struct i915_vma *vma = i915_gem_obj_to_vma(obj, ggtt_vm); int ret; DRM_DEBUG_KMS("reserving preallocated space: %lx + %zx\n", i915_gem_obj_ggtt_offset(obj), obj->base.size); WARN_ON(i915_gem_obj_ggtt_bound(obj)); ret = drm_mm_reserve_node(&ggtt_vm->mm, &vma->node); if (ret) DRM_DEBUG_KMS("Reservation failed\n"); obj->has_global_gtt_mapping = 1; } dev_priv->gtt.base.start = start; dev_priv->gtt.base.total = end - start; /* Clear any non-preallocated blocks */ drm_mm_for_each_hole(entry, &ggtt_vm->mm, hole_start, hole_end) { DRM_DEBUG_KMS("clearing unused GTT space: [%lx, %lx]\n", hole_start, hole_end); ggtt_vm->clear_range(ggtt_vm, hole_start, hole_end - hole_start, true); } /* And finally clear the reserved guard page */ ggtt_vm->clear_range(ggtt_vm, end - PAGE_SIZE, PAGE_SIZE, true); } void i915_gem_init_global_gtt(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; unsigned long gtt_size, mappable_size; gtt_size = dev_priv->gtt.base.total; mappable_size = dev_priv->gtt.mappable_end; i915_gem_setup_global_gtt(dev, 0, mappable_size, gtt_size); } static int setup_scratch_page(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct page *page; dma_addr_t dma_addr; page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO); if (page == NULL) return -ENOMEM; get_page(page); set_pages_uc(page, 1); #ifdef CONFIG_INTEL_IOMMU dma_addr = pci_map_page(dev->pdev, page, 0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); if (pci_dma_mapping_error(dev->pdev, dma_addr)) return -EINVAL; #else dma_addr = page_to_phys(page); #endif dev_priv->gtt.base.scratch.page = page; dev_priv->gtt.base.scratch.addr = dma_addr; return 0; } static void teardown_scratch_page(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct page *page = dev_priv->gtt.base.scratch.page; set_pages_wb(page, 1); pci_unmap_page(dev->pdev, dev_priv->gtt.base.scratch.addr, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); put_page(page); __free_page(page); } static inline unsigned int gen6_get_total_gtt_size(u16 snb_gmch_ctl) { snb_gmch_ctl >>= SNB_GMCH_GGMS_SHIFT; snb_gmch_ctl &= SNB_GMCH_GGMS_MASK; return snb_gmch_ctl << 20; } static inline unsigned int gen8_get_total_gtt_size(u16 bdw_gmch_ctl) { bdw_gmch_ctl >>= BDW_GMCH_GGMS_SHIFT; bdw_gmch_ctl &= BDW_GMCH_GGMS_MASK; if (bdw_gmch_ctl) bdw_gmch_ctl = 1 << bdw_gmch_ctl; return bdw_gmch_ctl << 20; } static inline size_t gen6_get_stolen_size(u16 snb_gmch_ctl) { snb_gmch_ctl >>= SNB_GMCH_GMS_SHIFT; snb_gmch_ctl &= SNB_GMCH_GMS_MASK; return snb_gmch_ctl << 25; /* 32 MB units */ } static inline size_t gen8_get_stolen_size(u16 bdw_gmch_ctl) { bdw_gmch_ctl >>= BDW_GMCH_GMS_SHIFT; bdw_gmch_ctl &= BDW_GMCH_GMS_MASK; return bdw_gmch_ctl << 25; /* 32 MB units */ } static int ggtt_probe_common(struct drm_device *dev, size_t gtt_size) { struct drm_i915_private *dev_priv = dev->dev_private; phys_addr_t gtt_phys_addr; int ret; /* For Modern GENs the PTEs and register space are split in the BAR */ gtt_phys_addr = pci_resource_start(dev->pdev, 0) + (pci_resource_len(dev->pdev, 0) / 2); dev_priv->gtt.gsm = ioremap_wc(gtt_phys_addr, gtt_size); if (!dev_priv->gtt.gsm) { DRM_ERROR("Failed to map the gtt page table\n"); return -ENOMEM; } ret = setup_scratch_page(dev); if (ret) { DRM_ERROR("Scratch setup failed\n"); /* iounmap will also get called at remove, but meh */ iounmap(dev_priv->gtt.gsm); } return ret; } /* The GGTT and PPGTT need a private PPAT setup in order to handle cacheability * bits. When using advanced contexts each context stores its own PAT, but * writing this data shouldn't be harmful even in those cases. */ static void gen8_setup_private_ppat(struct drm_i915_private *dev_priv) { uint64_t pat; pat = GEN8_PPAT(0, GEN8_PPAT_WB | GEN8_PPAT_LLC) | /* for normal objects, no eLLC */ GEN8_PPAT(1, GEN8_PPAT_WC | GEN8_PPAT_LLCELLC) | /* for something pointing to ptes? */ GEN8_PPAT(2, GEN8_PPAT_WT | GEN8_PPAT_LLCELLC) | /* for scanout with eLLC */ GEN8_PPAT(3, GEN8_PPAT_UC) | /* Uncached objects, mostly for scanout */ GEN8_PPAT(4, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(0)) | GEN8_PPAT(5, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(1)) | GEN8_PPAT(6, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(2)) | GEN8_PPAT(7, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(3)); /* XXX: spec defines this as 2 distinct registers. It's unclear if a 64b * write would work. */ I915_WRITE(GEN8_PRIVATE_PAT, pat); I915_WRITE(GEN8_PRIVATE_PAT + 4, pat >> 32); } static int gen8_gmch_probe(struct drm_device *dev, size_t *gtt_total, size_t *stolen, phys_addr_t *mappable_base, unsigned long *mappable_end) { struct drm_i915_private *dev_priv = dev->dev_private; unsigned int gtt_size; u16 snb_gmch_ctl; int ret; /* TODO: We're not aware of mappable constraints on gen8 yet */ *mappable_base = pci_resource_start(dev->pdev, 2); *mappable_end = pci_resource_len(dev->pdev, 2); if (!pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(39))) pci_set_consistent_dma_mask(dev->pdev, DMA_BIT_MASK(39)); pci_read_config_word(dev->pdev, SNB_GMCH_CTRL, &snb_gmch_ctl); *stolen = gen8_get_stolen_size(snb_gmch_ctl); gtt_size = gen8_get_total_gtt_size(snb_gmch_ctl); *gtt_total = (gtt_size / sizeof(gen8_gtt_pte_t)) << PAGE_SHIFT; gen8_setup_private_ppat(dev_priv); ret = ggtt_probe_common(dev, gtt_size); dev_priv->gtt.base.clear_range = gen8_ggtt_clear_range; dev_priv->gtt.base.insert_entries = gen8_ggtt_insert_entries; return ret; } static int gen6_gmch_probe(struct drm_device *dev, size_t *gtt_total, size_t *stolen, phys_addr_t *mappable_base, unsigned long *mappable_end) { struct drm_i915_private *dev_priv = dev->dev_private; unsigned int gtt_size; u16 snb_gmch_ctl; int ret; *mappable_base = pci_resource_start(dev->pdev, 2); *mappable_end = pci_resource_len(dev->pdev, 2); /* 64/512MB is the current min/max we actually know of, but this is just * a coarse sanity check. */ if ((*mappable_end < (64<<20) || (*mappable_end > (512<<20)))) { DRM_ERROR("Unknown GMADR size (%lx)\n", dev_priv->gtt.mappable_end); return -ENXIO; } if (!pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(40))) pci_set_consistent_dma_mask(dev->pdev, DMA_BIT_MASK(40)); pci_read_config_word(dev->pdev, SNB_GMCH_CTRL, &snb_gmch_ctl); *stolen = gen6_get_stolen_size(snb_gmch_ctl); gtt_size = gen6_get_total_gtt_size(snb_gmch_ctl); *gtt_total = (gtt_size / sizeof(gen6_gtt_pte_t)) << PAGE_SHIFT; ret = ggtt_probe_common(dev, gtt_size); dev_priv->gtt.base.clear_range = gen6_ggtt_clear_range; dev_priv->gtt.base.insert_entries = gen6_ggtt_insert_entries; return ret; } static void gen6_gmch_remove(struct i915_address_space *vm) { struct i915_gtt *gtt = container_of(vm, struct i915_gtt, base); drm_mm_takedown(&vm->mm); iounmap(gtt->gsm); teardown_scratch_page(vm->dev); } static int i915_gmch_probe(struct drm_device *dev, size_t *gtt_total, size_t *stolen, phys_addr_t *mappable_base, unsigned long *mappable_end) { struct drm_i915_private *dev_priv = dev->dev_private; int ret; ret = intel_gmch_probe(dev_priv->bridge_dev, dev_priv->dev->pdev, NULL); if (!ret) { DRM_ERROR("failed to set up gmch\n"); return -EIO; } intel_gtt_get(gtt_total, stolen, mappable_base, mappable_end); dev_priv->gtt.do_idle_maps = needs_idle_maps(dev_priv->dev); dev_priv->gtt.base.clear_range = i915_ggtt_clear_range; if (unlikely(dev_priv->gtt.do_idle_maps)) DRM_INFO("applying Ironlake quirks for intel_iommu\n"); return 0; } static void i915_gmch_remove(struct i915_address_space *vm) { intel_gmch_remove(); } int i915_gem_gtt_init(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct i915_gtt *gtt = &dev_priv->gtt; int ret; if (INTEL_INFO(dev)->gen <= 5) { gtt->gtt_probe = i915_gmch_probe; gtt->base.cleanup = i915_gmch_remove; } else if (INTEL_INFO(dev)->gen < 8) { gtt->gtt_probe = gen6_gmch_probe; gtt->base.cleanup = gen6_gmch_remove; if (IS_HASWELL(dev) && dev_priv->ellc_size) gtt->base.pte_encode = iris_pte_encode; else if (IS_HASWELL(dev)) gtt->base.pte_encode = hsw_pte_encode; else if (IS_VALLEYVIEW(dev)) gtt->base.pte_encode = byt_pte_encode; else if (INTEL_INFO(dev)->gen >= 7) gtt->base.pte_encode = ivb_pte_encode; else gtt->base.pte_encode = snb_pte_encode; } else { dev_priv->gtt.gtt_probe = gen8_gmch_probe; dev_priv->gtt.base.cleanup = gen6_gmch_remove; } ret = gtt->gtt_probe(dev, >t->base.total, >t->stolen_size, >t->mappable_base, >t->mappable_end); if (ret) return ret; gtt->base.dev = dev; /* GMADR is the PCI mmio aperture into the global GTT. */ DRM_INFO("Memory usable by graphics device = %zdM\n", gtt->base.total >> 20); DRM_DEBUG_DRIVER("GMADR size = %ldM\n", gtt->mappable_end >> 20); DRM_DEBUG_DRIVER("GTT stolen size = %zdM\n", gtt->stolen_size >> 20); #ifdef CONFIG_INTEL_IOMMU if (intel_iommu_gfx_mapped) DRM_INFO("VT-d active for gfx access\n"); #endif return 0; } static struct i915_vma *__i915_gem_vma_create(struct drm_i915_gem_object *obj, struct i915_address_space *vm) { struct i915_vma *vma = kzalloc(sizeof(*vma), GFP_KERNEL); if (vma == NULL) return ERR_PTR(-ENOMEM); INIT_LIST_HEAD(&vma->vma_link); INIT_LIST_HEAD(&vma->mm_list); INIT_LIST_HEAD(&vma->exec_list); vma->vm = vm; vma->obj = obj; switch (INTEL_INFO(vm->dev)->gen) { case 8: case 7: case 6: if (i915_is_ggtt(vm)) { vma->unbind_vma = ggtt_unbind_vma; vma->bind_vma = ggtt_bind_vma; } else { vma->unbind_vma = ppgtt_unbind_vma; vma->bind_vma = ppgtt_bind_vma; } break; case 5: case 4: case 3: case 2: BUG_ON(!i915_is_ggtt(vm)); vma->unbind_vma = i915_ggtt_unbind_vma; vma->bind_vma = i915_ggtt_bind_vma; break; default: BUG(); } /* Keep GGTT vmas first to make debug easier */ if (i915_is_ggtt(vm)) list_add(&vma->vma_link, &obj->vma_list); else list_add_tail(&vma->vma_link, &obj->vma_list); return vma; } struct i915_vma * i915_gem_obj_lookup_or_create_vma(struct drm_i915_gem_object *obj, struct i915_address_space *vm) { struct i915_vma *vma; vma = i915_gem_obj_to_vma(obj, vm); if (!vma) vma = __i915_gem_vma_create(obj, vm); return vma; }