/* * 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 /* fault-inject.h is not standalone! */ #include #include #include #include #include #include #include #include #include "i915_drv.h" #include "i915_vgpu.h" #include "i915_trace.h" #include "intel_drv.h" #include "intel_frontbuffer.h" #define I915_GFP_DMA (GFP_KERNEL | __GFP_HIGHMEM) /** * DOC: Global GTT views * * Background and previous state * * Historically objects could exists (be bound) in global GTT space only as * singular instances with a view representing all of the object's backing pages * in a linear fashion. This view will be called a normal view. * * To support multiple views of the same object, where the number of mapped * pages is not equal to the backing store, or where the layout of the pages * is not linear, concept of a GGTT view was added. * * One example of an alternative view is a stereo display driven by a single * image. In this case we would have a framebuffer looking like this * (2x2 pages): * * 12 * 34 * * Above would represent a normal GGTT view as normally mapped for GPU or CPU * rendering. In contrast, fed to the display engine would be an alternative * view which could look something like this: * * 1212 * 3434 * * In this example both the size and layout of pages in the alternative view is * different from the normal view. * * Implementation and usage * * GGTT views are implemented using VMAs and are distinguished via enum * i915_ggtt_view_type and struct i915_ggtt_view. * * A new flavour of core GEM functions which work with GGTT bound objects were * added with the _ggtt_ infix, and sometimes with _view postfix to avoid * renaming in large amounts of code. They take the struct i915_ggtt_view * parameter encapsulating all metadata required to implement a view. * * As a helper for callers which are only interested in the normal view, * globally const i915_ggtt_view_normal singleton instance exists. All old core * GEM API functions, the ones not taking the view parameter, are operating on, * or with the normal GGTT view. * * Code wanting to add or use a new GGTT view needs to: * * 1. Add a new enum with a suitable name. * 2. Extend the metadata in the i915_ggtt_view structure if required. * 3. Add support to i915_get_vma_pages(). * * New views are required to build a scatter-gather table from within the * i915_get_vma_pages function. This table is stored in the vma.ggtt_view and * exists for the lifetime of an VMA. * * Core API is designed to have copy semantics which means that passed in * struct i915_ggtt_view does not need to be persistent (left around after * calling the core API functions). * */ static int i915_get_ggtt_vma_pages(struct i915_vma *vma); static void gen6_ggtt_invalidate(struct drm_i915_private *dev_priv) { /* Note that as an uncached mmio write, this should flush the * WCB of the writes into the GGTT before it triggers the invalidate. */ I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN); } static void guc_ggtt_invalidate(struct drm_i915_private *dev_priv) { gen6_ggtt_invalidate(dev_priv); I915_WRITE(GEN8_GTCR, GEN8_GTCR_INVALIDATE); } static void gmch_ggtt_invalidate(struct drm_i915_private *dev_priv) { intel_gtt_chipset_flush(); } static inline void i915_ggtt_invalidate(struct drm_i915_private *i915) { i915->ggtt.invalidate(i915); } int intel_sanitize_enable_ppgtt(struct drm_i915_private *dev_priv, int enable_ppgtt) { bool has_full_ppgtt; bool has_full_48bit_ppgtt; if (!dev_priv->info.has_aliasing_ppgtt) return 0; has_full_ppgtt = dev_priv->info.has_full_ppgtt; has_full_48bit_ppgtt = dev_priv->info.has_full_48bit_ppgtt; if (intel_vgpu_active(dev_priv)) { /* GVT-g has no support for 32bit ppgtt */ has_full_ppgtt = false; has_full_48bit_ppgtt = intel_vgpu_has_full_48bit_ppgtt(dev_priv); } /* * We don't allow disabling PPGTT for gen9+ as it's a requirement for * execlists, the sole mechanism available to submit work. */ if (enable_ppgtt == 0 && INTEL_GEN(dev_priv) < 9) return 0; if (enable_ppgtt == 1) return 1; if (enable_ppgtt == 2 && has_full_ppgtt) return 2; if (enable_ppgtt == 3 && has_full_48bit_ppgtt) return 3; /* Disable ppgtt on SNB if VT-d is on. */ if (IS_GEN6(dev_priv) && intel_vtd_active()) { DRM_INFO("Disabling PPGTT because VT-d is on\n"); return 0; } /* Early VLV doesn't have this */ if (IS_VALLEYVIEW(dev_priv) && dev_priv->drm.pdev->revision < 0xb) { DRM_DEBUG_DRIVER("disabling PPGTT on pre-B3 step VLV\n"); return 0; } if (HAS_LOGICAL_RING_CONTEXTS(dev_priv)) { if (has_full_48bit_ppgtt) return 3; if (has_full_ppgtt) return 2; } return 1; } static int ppgtt_bind_vma(struct i915_vma *vma, enum i915_cache_level cache_level, u32 unused) { u32 pte_flags; int ret; if (!(vma->flags & I915_VMA_LOCAL_BIND)) { ret = vma->vm->allocate_va_range(vma->vm, vma->node.start, vma->size); if (ret) return ret; } /* Currently applicable only to VLV */ pte_flags = 0; if (vma->obj->gt_ro) pte_flags |= PTE_READ_ONLY; vma->vm->insert_entries(vma->vm, vma, cache_level, pte_flags); return 0; } static void ppgtt_unbind_vma(struct i915_vma *vma) { vma->vm->clear_range(vma->vm, vma->node.start, vma->size); } static int ppgtt_set_pages(struct i915_vma *vma) { GEM_BUG_ON(vma->pages); vma->pages = vma->obj->mm.pages; vma->page_sizes = vma->obj->mm.page_sizes; return 0; } static void clear_pages(struct i915_vma *vma) { GEM_BUG_ON(!vma->pages); if (vma->pages != vma->obj->mm.pages) { sg_free_table(vma->pages); kfree(vma->pages); } vma->pages = NULL; memset(&vma->page_sizes, 0, sizeof(vma->page_sizes)); } static gen8_pte_t gen8_pte_encode(dma_addr_t addr, enum i915_cache_level level) { gen8_pte_t pte = _PAGE_PRESENT | _PAGE_RW; pte |= addr; switch (level) { case I915_CACHE_NONE: pte |= PPAT_UNCACHED; break; case I915_CACHE_WT: pte |= PPAT_DISPLAY_ELLC; break; default: pte |= PPAT_CACHED; break; } return pte; } static gen8_pde_t gen8_pde_encode(const dma_addr_t addr, const enum i915_cache_level level) { gen8_pde_t pde = _PAGE_PRESENT | _PAGE_RW; pde |= addr; if (level != I915_CACHE_NONE) pde |= PPAT_CACHED_PDE; else pde |= PPAT_UNCACHED; return pde; } #define gen8_pdpe_encode gen8_pde_encode #define gen8_pml4e_encode gen8_pde_encode static gen6_pte_t snb_pte_encode(dma_addr_t addr, enum i915_cache_level level, u32 unused) { gen6_pte_t pte = GEN6_PTE_VALID; 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: MISSING_CASE(level); } return pte; } static gen6_pte_t ivb_pte_encode(dma_addr_t addr, enum i915_cache_level level, u32 unused) { gen6_pte_t pte = GEN6_PTE_VALID; 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: MISSING_CASE(level); } return pte; } static gen6_pte_t byt_pte_encode(dma_addr_t addr, enum i915_cache_level level, u32 flags) { gen6_pte_t pte = GEN6_PTE_VALID; pte |= GEN6_PTE_ADDR_ENCODE(addr); if (!(flags & PTE_READ_ONLY)) pte |= BYT_PTE_WRITEABLE; if (level != I915_CACHE_NONE) pte |= BYT_PTE_SNOOPED_BY_CPU_CACHES; return pte; } static gen6_pte_t hsw_pte_encode(dma_addr_t addr, enum i915_cache_level level, u32 unused) { gen6_pte_t pte = GEN6_PTE_VALID; pte |= HSW_PTE_ADDR_ENCODE(addr); if (level != I915_CACHE_NONE) pte |= HSW_WB_LLC_AGE3; return pte; } static gen6_pte_t iris_pte_encode(dma_addr_t addr, enum i915_cache_level level, u32 unused) { gen6_pte_t pte = GEN6_PTE_VALID; 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; } static struct page *vm_alloc_page(struct i915_address_space *vm, gfp_t gfp) { struct pagevec *pvec = &vm->free_pages; if (I915_SELFTEST_ONLY(should_fail(&vm->fault_attr, 1))) i915_gem_shrink_all(vm->i915); if (likely(pvec->nr)) return pvec->pages[--pvec->nr]; if (!vm->pt_kmap_wc) return alloc_page(gfp); /* A placeholder for a specific mutex to guard the WC stash */ lockdep_assert_held(&vm->i915->drm.struct_mutex); /* Look in our global stash of WC pages... */ pvec = &vm->i915->mm.wc_stash; if (likely(pvec->nr)) return pvec->pages[--pvec->nr]; /* Otherwise batch allocate pages to amoritize cost of set_pages_wc. */ do { struct page *page; page = alloc_page(gfp); if (unlikely(!page)) break; pvec->pages[pvec->nr++] = page; } while (pagevec_space(pvec)); if (unlikely(!pvec->nr)) return NULL; set_pages_array_wc(pvec->pages, pvec->nr); return pvec->pages[--pvec->nr]; } static void vm_free_pages_release(struct i915_address_space *vm, bool immediate) { struct pagevec *pvec = &vm->free_pages; GEM_BUG_ON(!pagevec_count(pvec)); if (vm->pt_kmap_wc) { struct pagevec *stash = &vm->i915->mm.wc_stash; /* When we use WC, first fill up the global stash and then * only if full immediately free the overflow. */ lockdep_assert_held(&vm->i915->drm.struct_mutex); if (pagevec_space(stash)) { do { stash->pages[stash->nr++] = pvec->pages[--pvec->nr]; if (!pvec->nr) return; } while (pagevec_space(stash)); /* As we have made some room in the VM's free_pages, * we can wait for it to fill again. Unless we are * inside i915_address_space_fini() and must * immediately release the pages! */ if (!immediate) return; } set_pages_array_wb(pvec->pages, pvec->nr); } __pagevec_release(pvec); } static void vm_free_page(struct i915_address_space *vm, struct page *page) { /* * On !llc, we need to change the pages back to WB. We only do so * in bulk, so we rarely need to change the page attributes here, * but doing so requires a stop_machine() from deep inside arch/x86/mm. * To make detection of the possible sleep more likely, use an * unconditional might_sleep() for everybody. */ might_sleep(); if (!pagevec_add(&vm->free_pages, page)) vm_free_pages_release(vm, false); } static int __setup_page_dma(struct i915_address_space *vm, struct i915_page_dma *p, gfp_t gfp) { p->page = vm_alloc_page(vm, gfp | __GFP_NOWARN | __GFP_NORETRY); if (unlikely(!p->page)) return -ENOMEM; p->daddr = dma_map_page(vm->dma, p->page, 0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); if (unlikely(dma_mapping_error(vm->dma, p->daddr))) { vm_free_page(vm, p->page); return -ENOMEM; } return 0; } static int setup_page_dma(struct i915_address_space *vm, struct i915_page_dma *p) { return __setup_page_dma(vm, p, I915_GFP_DMA); } static void cleanup_page_dma(struct i915_address_space *vm, struct i915_page_dma *p) { dma_unmap_page(vm->dma, p->daddr, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); vm_free_page(vm, p->page); } #define kmap_atomic_px(px) kmap_atomic(px_base(px)->page) #define setup_px(vm, px) setup_page_dma((vm), px_base(px)) #define cleanup_px(vm, px) cleanup_page_dma((vm), px_base(px)) #define fill_px(ppgtt, px, v) fill_page_dma((vm), px_base(px), (v)) #define fill32_px(ppgtt, px, v) fill_page_dma_32((vm), px_base(px), (v)) static void fill_page_dma(struct i915_address_space *vm, struct i915_page_dma *p, const u64 val) { u64 * const vaddr = kmap_atomic(p->page); memset64(vaddr, val, PAGE_SIZE / sizeof(val)); kunmap_atomic(vaddr); } static void fill_page_dma_32(struct i915_address_space *vm, struct i915_page_dma *p, const u32 v) { fill_page_dma(vm, p, (u64)v << 32 | v); } static int setup_scratch_page(struct i915_address_space *vm, gfp_t gfp) { struct page *page = NULL; dma_addr_t addr; int order; /* * In order to utilize 64K pages for an object with a size < 2M, we will * need to support a 64K scratch page, given that every 16th entry for a * page-table operating in 64K mode must point to a properly aligned 64K * region, including any PTEs which happen to point to scratch. * * This is only relevant for the 48b PPGTT where we support * huge-gtt-pages, see also i915_vma_insert(). * * TODO: we should really consider write-protecting the scratch-page and * sharing between ppgtt */ if (i915_vm_is_48bit(vm) && HAS_PAGE_SIZES(vm->i915, I915_GTT_PAGE_SIZE_64K)) { order = get_order(I915_GTT_PAGE_SIZE_64K); page = alloc_pages(gfp | __GFP_ZERO | __GFP_NOWARN, order); if (page) { addr = dma_map_page(vm->dma, page, 0, I915_GTT_PAGE_SIZE_64K, PCI_DMA_BIDIRECTIONAL); if (unlikely(dma_mapping_error(vm->dma, addr))) { __free_pages(page, order); page = NULL; } if (!IS_ALIGNED(addr, I915_GTT_PAGE_SIZE_64K)) { dma_unmap_page(vm->dma, addr, I915_GTT_PAGE_SIZE_64K, PCI_DMA_BIDIRECTIONAL); __free_pages(page, order); page = NULL; } } } if (!page) { order = 0; page = alloc_page(gfp | __GFP_ZERO); if (unlikely(!page)) return -ENOMEM; addr = dma_map_page(vm->dma, page, 0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); if (unlikely(dma_mapping_error(vm->dma, addr))) { __free_page(page); return -ENOMEM; } } vm->scratch_page.page = page; vm->scratch_page.daddr = addr; vm->scratch_page.order = order; return 0; } static void cleanup_scratch_page(struct i915_address_space *vm) { struct i915_page_dma *p = &vm->scratch_page; dma_unmap_page(vm->dma, p->daddr, BIT(p->order) << PAGE_SHIFT, PCI_DMA_BIDIRECTIONAL); __free_pages(p->page, p->order); } static struct i915_page_table *alloc_pt(struct i915_address_space *vm) { struct i915_page_table *pt; pt = kmalloc(sizeof(*pt), GFP_KERNEL | __GFP_NOWARN); if (unlikely(!pt)) return ERR_PTR(-ENOMEM); if (unlikely(setup_px(vm, pt))) { kfree(pt); return ERR_PTR(-ENOMEM); } pt->used_ptes = 0; return pt; } static void free_pt(struct i915_address_space *vm, struct i915_page_table *pt) { cleanup_px(vm, pt); kfree(pt); } static void gen8_initialize_pt(struct i915_address_space *vm, struct i915_page_table *pt) { fill_px(vm, pt, gen8_pte_encode(vm->scratch_page.daddr, I915_CACHE_LLC)); } static void gen6_initialize_pt(struct i915_address_space *vm, struct i915_page_table *pt) { fill32_px(vm, pt, vm->pte_encode(vm->scratch_page.daddr, I915_CACHE_LLC, 0)); } static struct i915_page_directory *alloc_pd(struct i915_address_space *vm) { struct i915_page_directory *pd; pd = kzalloc(sizeof(*pd), GFP_KERNEL | __GFP_NOWARN); if (unlikely(!pd)) return ERR_PTR(-ENOMEM); if (unlikely(setup_px(vm, pd))) { kfree(pd); return ERR_PTR(-ENOMEM); } pd->used_pdes = 0; return pd; } static void free_pd(struct i915_address_space *vm, struct i915_page_directory *pd) { cleanup_px(vm, pd); kfree(pd); } static void gen8_initialize_pd(struct i915_address_space *vm, struct i915_page_directory *pd) { unsigned int i; fill_px(vm, pd, gen8_pde_encode(px_dma(vm->scratch_pt), I915_CACHE_LLC)); for (i = 0; i < I915_PDES; i++) pd->page_table[i] = vm->scratch_pt; } static int __pdp_init(struct i915_address_space *vm, struct i915_page_directory_pointer *pdp) { const unsigned int pdpes = i915_pdpes_per_pdp(vm); unsigned int i; pdp->page_directory = kmalloc_array(pdpes, sizeof(*pdp->page_directory), GFP_KERNEL | __GFP_NOWARN); if (unlikely(!pdp->page_directory)) return -ENOMEM; for (i = 0; i < pdpes; i++) pdp->page_directory[i] = vm->scratch_pd; return 0; } static void __pdp_fini(struct i915_page_directory_pointer *pdp) { kfree(pdp->page_directory); pdp->page_directory = NULL; } static inline bool use_4lvl(const struct i915_address_space *vm) { return i915_vm_is_48bit(vm); } static struct i915_page_directory_pointer * alloc_pdp(struct i915_address_space *vm) { struct i915_page_directory_pointer *pdp; int ret = -ENOMEM; WARN_ON(!use_4lvl(vm)); pdp = kzalloc(sizeof(*pdp), GFP_KERNEL); if (!pdp) return ERR_PTR(-ENOMEM); ret = __pdp_init(vm, pdp); if (ret) goto fail_bitmap; ret = setup_px(vm, pdp); if (ret) goto fail_page_m; return pdp; fail_page_m: __pdp_fini(pdp); fail_bitmap: kfree(pdp); return ERR_PTR(ret); } static void free_pdp(struct i915_address_space *vm, struct i915_page_directory_pointer *pdp) { __pdp_fini(pdp); if (!use_4lvl(vm)) return; cleanup_px(vm, pdp); kfree(pdp); } static void gen8_initialize_pdp(struct i915_address_space *vm, struct i915_page_directory_pointer *pdp) { gen8_ppgtt_pdpe_t scratch_pdpe; scratch_pdpe = gen8_pdpe_encode(px_dma(vm->scratch_pd), I915_CACHE_LLC); fill_px(vm, pdp, scratch_pdpe); } static void gen8_initialize_pml4(struct i915_address_space *vm, struct i915_pml4 *pml4) { unsigned int i; fill_px(vm, pml4, gen8_pml4e_encode(px_dma(vm->scratch_pdp), I915_CACHE_LLC)); for (i = 0; i < GEN8_PML4ES_PER_PML4; i++) pml4->pdps[i] = vm->scratch_pdp; } /* Broadwell Page Directory Pointer Descriptors */ static int gen8_write_pdp(struct drm_i915_gem_request *req, unsigned entry, dma_addr_t addr) { struct intel_engine_cs *engine = req->engine; u32 *cs; BUG_ON(entry >= 4); cs = intel_ring_begin(req, 6); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = MI_LOAD_REGISTER_IMM(1); *cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_UDW(engine, entry)); *cs++ = upper_32_bits(addr); *cs++ = MI_LOAD_REGISTER_IMM(1); *cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_LDW(engine, entry)); *cs++ = lower_32_bits(addr); intel_ring_advance(req, cs); return 0; } static int gen8_mm_switch_3lvl(struct i915_hw_ppgtt *ppgtt, struct drm_i915_gem_request *req) { int i, ret; for (i = GEN8_3LVL_PDPES - 1; i >= 0; i--) { const dma_addr_t pd_daddr = i915_page_dir_dma_addr(ppgtt, i); ret = gen8_write_pdp(req, i, pd_daddr); if (ret) return ret; } return 0; } static int gen8_mm_switch_4lvl(struct i915_hw_ppgtt *ppgtt, struct drm_i915_gem_request *req) { return gen8_write_pdp(req, 0, px_dma(&ppgtt->pml4)); } /* PDE TLBs are a pain to invalidate on GEN8+. When we modify * the page table structures, we mark them dirty so that * context switching/execlist queuing code takes extra steps * to ensure that tlbs are flushed. */ static void mark_tlbs_dirty(struct i915_hw_ppgtt *ppgtt) { ppgtt->pd_dirty_rings = INTEL_INFO(ppgtt->base.i915)->ring_mask; } /* Removes entries from a single page table, releasing it if it's empty. * Caller can use the return value to update higher-level entries. */ static bool gen8_ppgtt_clear_pt(struct i915_address_space *vm, struct i915_page_table *pt, u64 start, u64 length) { unsigned int num_entries = gen8_pte_count(start, length); unsigned int pte = gen8_pte_index(start); unsigned int pte_end = pte + num_entries; const gen8_pte_t scratch_pte = gen8_pte_encode(vm->scratch_page.daddr, I915_CACHE_LLC); gen8_pte_t *vaddr; GEM_BUG_ON(num_entries > pt->used_ptes); pt->used_ptes -= num_entries; if (!pt->used_ptes) return true; vaddr = kmap_atomic_px(pt); while (pte < pte_end) vaddr[pte++] = scratch_pte; kunmap_atomic(vaddr); return false; } static void gen8_ppgtt_set_pde(struct i915_address_space *vm, struct i915_page_directory *pd, struct i915_page_table *pt, unsigned int pde) { gen8_pde_t *vaddr; pd->page_table[pde] = pt; vaddr = kmap_atomic_px(pd); vaddr[pde] = gen8_pde_encode(px_dma(pt), I915_CACHE_LLC); kunmap_atomic(vaddr); } static bool gen8_ppgtt_clear_pd(struct i915_address_space *vm, struct i915_page_directory *pd, u64 start, u64 length) { struct i915_page_table *pt; u32 pde; gen8_for_each_pde(pt, pd, start, length, pde) { GEM_BUG_ON(pt == vm->scratch_pt); if (!gen8_ppgtt_clear_pt(vm, pt, start, length)) continue; gen8_ppgtt_set_pde(vm, pd, vm->scratch_pt, pde); GEM_BUG_ON(!pd->used_pdes); pd->used_pdes--; free_pt(vm, pt); } return !pd->used_pdes; } static void gen8_ppgtt_set_pdpe(struct i915_address_space *vm, struct i915_page_directory_pointer *pdp, struct i915_page_directory *pd, unsigned int pdpe) { gen8_ppgtt_pdpe_t *vaddr; pdp->page_directory[pdpe] = pd; if (!use_4lvl(vm)) return; vaddr = kmap_atomic_px(pdp); vaddr[pdpe] = gen8_pdpe_encode(px_dma(pd), I915_CACHE_LLC); kunmap_atomic(vaddr); } /* Removes entries from a single page dir pointer, releasing it if it's empty. * Caller can use the return value to update higher-level entries */ static bool gen8_ppgtt_clear_pdp(struct i915_address_space *vm, struct i915_page_directory_pointer *pdp, u64 start, u64 length) { struct i915_page_directory *pd; unsigned int pdpe; gen8_for_each_pdpe(pd, pdp, start, length, pdpe) { GEM_BUG_ON(pd == vm->scratch_pd); if (!gen8_ppgtt_clear_pd(vm, pd, start, length)) continue; gen8_ppgtt_set_pdpe(vm, pdp, vm->scratch_pd, pdpe); GEM_BUG_ON(!pdp->used_pdpes); pdp->used_pdpes--; free_pd(vm, pd); } return !pdp->used_pdpes; } static void gen8_ppgtt_clear_3lvl(struct i915_address_space *vm, u64 start, u64 length) { gen8_ppgtt_clear_pdp(vm, &i915_vm_to_ppgtt(vm)->pdp, start, length); } static void gen8_ppgtt_set_pml4e(struct i915_pml4 *pml4, struct i915_page_directory_pointer *pdp, unsigned int pml4e) { gen8_ppgtt_pml4e_t *vaddr; pml4->pdps[pml4e] = pdp; vaddr = kmap_atomic_px(pml4); vaddr[pml4e] = gen8_pml4e_encode(px_dma(pdp), I915_CACHE_LLC); kunmap_atomic(vaddr); } /* Removes entries from a single pml4. * This is the top-level structure in 4-level page tables used on gen8+. * Empty entries are always scratch pml4e. */ static void gen8_ppgtt_clear_4lvl(struct i915_address_space *vm, u64 start, u64 length) { struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm); struct i915_pml4 *pml4 = &ppgtt->pml4; struct i915_page_directory_pointer *pdp; unsigned int pml4e; GEM_BUG_ON(!use_4lvl(vm)); gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) { GEM_BUG_ON(pdp == vm->scratch_pdp); if (!gen8_ppgtt_clear_pdp(vm, pdp, start, length)) continue; gen8_ppgtt_set_pml4e(pml4, vm->scratch_pdp, pml4e); free_pdp(vm, pdp); } } static inline struct sgt_dma { struct scatterlist *sg; dma_addr_t dma, max; } sgt_dma(struct i915_vma *vma) { struct scatterlist *sg = vma->pages->sgl; dma_addr_t addr = sg_dma_address(sg); return (struct sgt_dma) { sg, addr, addr + sg->length }; } struct gen8_insert_pte { u16 pml4e; u16 pdpe; u16 pde; u16 pte; }; static __always_inline struct gen8_insert_pte gen8_insert_pte(u64 start) { return (struct gen8_insert_pte) { gen8_pml4e_index(start), gen8_pdpe_index(start), gen8_pde_index(start), gen8_pte_index(start), }; } static __always_inline bool gen8_ppgtt_insert_pte_entries(struct i915_hw_ppgtt *ppgtt, struct i915_page_directory_pointer *pdp, struct sgt_dma *iter, struct gen8_insert_pte *idx, enum i915_cache_level cache_level) { struct i915_page_directory *pd; const gen8_pte_t pte_encode = gen8_pte_encode(0, cache_level); gen8_pte_t *vaddr; bool ret; GEM_BUG_ON(idx->pdpe >= i915_pdpes_per_pdp(&ppgtt->base)); pd = pdp->page_directory[idx->pdpe]; vaddr = kmap_atomic_px(pd->page_table[idx->pde]); do { vaddr[idx->pte] = pte_encode | iter->dma; iter->dma += PAGE_SIZE; if (iter->dma >= iter->max) { iter->sg = __sg_next(iter->sg); if (!iter->sg) { ret = false; break; } iter->dma = sg_dma_address(iter->sg); iter->max = iter->dma + iter->sg->length; } if (++idx->pte == GEN8_PTES) { idx->pte = 0; if (++idx->pde == I915_PDES) { idx->pde = 0; /* Limited by sg length for 3lvl */ if (++idx->pdpe == GEN8_PML4ES_PER_PML4) { idx->pdpe = 0; ret = true; break; } GEM_BUG_ON(idx->pdpe >= i915_pdpes_per_pdp(&ppgtt->base)); pd = pdp->page_directory[idx->pdpe]; } kunmap_atomic(vaddr); vaddr = kmap_atomic_px(pd->page_table[idx->pde]); } } while (1); kunmap_atomic(vaddr); return ret; } static void gen8_ppgtt_insert_3lvl(struct i915_address_space *vm, struct i915_vma *vma, enum i915_cache_level cache_level, u32 unused) { struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm); struct sgt_dma iter = sgt_dma(vma); struct gen8_insert_pte idx = gen8_insert_pte(vma->node.start); gen8_ppgtt_insert_pte_entries(ppgtt, &ppgtt->pdp, &iter, &idx, cache_level); vma->page_sizes.gtt = I915_GTT_PAGE_SIZE; } static void gen8_ppgtt_insert_huge_entries(struct i915_vma *vma, struct i915_page_directory_pointer **pdps, struct sgt_dma *iter, enum i915_cache_level cache_level) { const gen8_pte_t pte_encode = gen8_pte_encode(0, cache_level); u64 start = vma->node.start; dma_addr_t rem = iter->sg->length; do { struct gen8_insert_pte idx = gen8_insert_pte(start); struct i915_page_directory_pointer *pdp = pdps[idx.pml4e]; struct i915_page_directory *pd = pdp->page_directory[idx.pdpe]; unsigned int page_size; bool maybe_64K = false; gen8_pte_t encode = pte_encode; gen8_pte_t *vaddr; u16 index, max; if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_2M && IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_2M) && rem >= I915_GTT_PAGE_SIZE_2M && !idx.pte) { index = idx.pde; max = I915_PDES; page_size = I915_GTT_PAGE_SIZE_2M; encode |= GEN8_PDE_PS_2M; vaddr = kmap_atomic_px(pd); } else { struct i915_page_table *pt = pd->page_table[idx.pde]; index = idx.pte; max = GEN8_PTES; page_size = I915_GTT_PAGE_SIZE; if (!index && vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K && IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_64K) && (IS_ALIGNED(rem, I915_GTT_PAGE_SIZE_64K) || rem >= (max - index) << PAGE_SHIFT)) maybe_64K = true; vaddr = kmap_atomic_px(pt); } do { GEM_BUG_ON(iter->sg->length < page_size); vaddr[index++] = encode | iter->dma; start += page_size; iter->dma += page_size; rem -= page_size; if (iter->dma >= iter->max) { iter->sg = __sg_next(iter->sg); if (!iter->sg) break; rem = iter->sg->length; iter->dma = sg_dma_address(iter->sg); iter->max = iter->dma + rem; if (maybe_64K && index < max && !(IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_64K) && (IS_ALIGNED(rem, I915_GTT_PAGE_SIZE_64K) || rem >= (max - index) << PAGE_SHIFT))) maybe_64K = false; if (unlikely(!IS_ALIGNED(iter->dma, page_size))) break; } } while (rem >= page_size && index < max); kunmap_atomic(vaddr); /* * Is it safe to mark the 2M block as 64K? -- Either we have * filled whole page-table with 64K entries, or filled part of * it and have reached the end of the sg table and we have * enough padding. */ if (maybe_64K && (index == max || (i915_vm_has_scratch_64K(vma->vm) && !iter->sg && IS_ALIGNED(vma->node.start + vma->node.size, I915_GTT_PAGE_SIZE_2M)))) { vaddr = kmap_atomic_px(pd); vaddr[idx.pde] |= GEN8_PDE_IPS_64K; kunmap_atomic(vaddr); page_size = I915_GTT_PAGE_SIZE_64K; } vma->page_sizes.gtt |= page_size; } while (iter->sg); } static void gen8_ppgtt_insert_4lvl(struct i915_address_space *vm, struct i915_vma *vma, enum i915_cache_level cache_level, u32 unused) { struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm); struct sgt_dma iter = sgt_dma(vma); struct i915_page_directory_pointer **pdps = ppgtt->pml4.pdps; if (vma->page_sizes.sg > I915_GTT_PAGE_SIZE) { gen8_ppgtt_insert_huge_entries(vma, pdps, &iter, cache_level); } else { struct gen8_insert_pte idx = gen8_insert_pte(vma->node.start); while (gen8_ppgtt_insert_pte_entries(ppgtt, pdps[idx.pml4e++], &iter, &idx, cache_level)) GEM_BUG_ON(idx.pml4e >= GEN8_PML4ES_PER_PML4); vma->page_sizes.gtt = I915_GTT_PAGE_SIZE; } } static void gen8_free_page_tables(struct i915_address_space *vm, struct i915_page_directory *pd) { int i; if (!px_page(pd)) return; for (i = 0; i < I915_PDES; i++) { if (pd->page_table[i] != vm->scratch_pt) free_pt(vm, pd->page_table[i]); } } static int gen8_init_scratch(struct i915_address_space *vm) { int ret; ret = setup_scratch_page(vm, I915_GFP_DMA); if (ret) return ret; vm->scratch_pt = alloc_pt(vm); if (IS_ERR(vm->scratch_pt)) { ret = PTR_ERR(vm->scratch_pt); goto free_scratch_page; } vm->scratch_pd = alloc_pd(vm); if (IS_ERR(vm->scratch_pd)) { ret = PTR_ERR(vm->scratch_pd); goto free_pt; } if (use_4lvl(vm)) { vm->scratch_pdp = alloc_pdp(vm); if (IS_ERR(vm->scratch_pdp)) { ret = PTR_ERR(vm->scratch_pdp); goto free_pd; } } gen8_initialize_pt(vm, vm->scratch_pt); gen8_initialize_pd(vm, vm->scratch_pd); if (use_4lvl(vm)) gen8_initialize_pdp(vm, vm->scratch_pdp); return 0; free_pd: free_pd(vm, vm->scratch_pd); free_pt: free_pt(vm, vm->scratch_pt); free_scratch_page: cleanup_scratch_page(vm); return ret; } static int gen8_ppgtt_notify_vgt(struct i915_hw_ppgtt *ppgtt, bool create) { struct i915_address_space *vm = &ppgtt->base; struct drm_i915_private *dev_priv = vm->i915; enum vgt_g2v_type msg; int i; if (use_4lvl(vm)) { const u64 daddr = px_dma(&ppgtt->pml4); I915_WRITE(vgtif_reg(pdp[0].lo), lower_32_bits(daddr)); I915_WRITE(vgtif_reg(pdp[0].hi), upper_32_bits(daddr)); msg = (create ? VGT_G2V_PPGTT_L4_PAGE_TABLE_CREATE : VGT_G2V_PPGTT_L4_PAGE_TABLE_DESTROY); } else { for (i = 0; i < GEN8_3LVL_PDPES; i++) { const u64 daddr = i915_page_dir_dma_addr(ppgtt, i); I915_WRITE(vgtif_reg(pdp[i].lo), lower_32_bits(daddr)); I915_WRITE(vgtif_reg(pdp[i].hi), upper_32_bits(daddr)); } msg = (create ? VGT_G2V_PPGTT_L3_PAGE_TABLE_CREATE : VGT_G2V_PPGTT_L3_PAGE_TABLE_DESTROY); } I915_WRITE(vgtif_reg(g2v_notify), msg); return 0; } static void gen8_free_scratch(struct i915_address_space *vm) { if (use_4lvl(vm)) free_pdp(vm, vm->scratch_pdp); free_pd(vm, vm->scratch_pd); free_pt(vm, vm->scratch_pt); cleanup_scratch_page(vm); } static void gen8_ppgtt_cleanup_3lvl(struct i915_address_space *vm, struct i915_page_directory_pointer *pdp) { const unsigned int pdpes = i915_pdpes_per_pdp(vm); int i; for (i = 0; i < pdpes; i++) { if (pdp->page_directory[i] == vm->scratch_pd) continue; gen8_free_page_tables(vm, pdp->page_directory[i]); free_pd(vm, pdp->page_directory[i]); } free_pdp(vm, pdp); } static void gen8_ppgtt_cleanup_4lvl(struct i915_hw_ppgtt *ppgtt) { int i; for (i = 0; i < GEN8_PML4ES_PER_PML4; i++) { if (ppgtt->pml4.pdps[i] == ppgtt->base.scratch_pdp) continue; gen8_ppgtt_cleanup_3lvl(&ppgtt->base, ppgtt->pml4.pdps[i]); } cleanup_px(&ppgtt->base, &ppgtt->pml4); } static void gen8_ppgtt_cleanup(struct i915_address_space *vm) { struct drm_i915_private *dev_priv = vm->i915; struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm); if (intel_vgpu_active(dev_priv)) gen8_ppgtt_notify_vgt(ppgtt, false); if (use_4lvl(vm)) gen8_ppgtt_cleanup_4lvl(ppgtt); else gen8_ppgtt_cleanup_3lvl(&ppgtt->base, &ppgtt->pdp); gen8_free_scratch(vm); } static int gen8_ppgtt_alloc_pd(struct i915_address_space *vm, struct i915_page_directory *pd, u64 start, u64 length) { struct i915_page_table *pt; u64 from = start; unsigned int pde; gen8_for_each_pde(pt, pd, start, length, pde) { int count = gen8_pte_count(start, length); if (pt == vm->scratch_pt) { pt = alloc_pt(vm); if (IS_ERR(pt)) goto unwind; if (count < GEN8_PTES || intel_vgpu_active(vm->i915)) gen8_initialize_pt(vm, pt); gen8_ppgtt_set_pde(vm, pd, pt, pde); pd->used_pdes++; GEM_BUG_ON(pd->used_pdes > I915_PDES); } pt->used_ptes += count; } return 0; unwind: gen8_ppgtt_clear_pd(vm, pd, from, start - from); return -ENOMEM; } static int gen8_ppgtt_alloc_pdp(struct i915_address_space *vm, struct i915_page_directory_pointer *pdp, u64 start, u64 length) { struct i915_page_directory *pd; u64 from = start; unsigned int pdpe; int ret; gen8_for_each_pdpe(pd, pdp, start, length, pdpe) { if (pd == vm->scratch_pd) { pd = alloc_pd(vm); if (IS_ERR(pd)) goto unwind; gen8_initialize_pd(vm, pd); gen8_ppgtt_set_pdpe(vm, pdp, pd, pdpe); pdp->used_pdpes++; GEM_BUG_ON(pdp->used_pdpes > i915_pdpes_per_pdp(vm)); mark_tlbs_dirty(i915_vm_to_ppgtt(vm)); } ret = gen8_ppgtt_alloc_pd(vm, pd, start, length); if (unlikely(ret)) goto unwind_pd; } return 0; unwind_pd: if (!pd->used_pdes) { gen8_ppgtt_set_pdpe(vm, pdp, vm->scratch_pd, pdpe); GEM_BUG_ON(!pdp->used_pdpes); pdp->used_pdpes--; free_pd(vm, pd); } unwind: gen8_ppgtt_clear_pdp(vm, pdp, from, start - from); return -ENOMEM; } static int gen8_ppgtt_alloc_3lvl(struct i915_address_space *vm, u64 start, u64 length) { return gen8_ppgtt_alloc_pdp(vm, &i915_vm_to_ppgtt(vm)->pdp, start, length); } static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm, u64 start, u64 length) { struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm); struct i915_pml4 *pml4 = &ppgtt->pml4; struct i915_page_directory_pointer *pdp; u64 from = start; u32 pml4e; int ret; gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) { if (pml4->pdps[pml4e] == vm->scratch_pdp) { pdp = alloc_pdp(vm); if (IS_ERR(pdp)) goto unwind; gen8_initialize_pdp(vm, pdp); gen8_ppgtt_set_pml4e(pml4, pdp, pml4e); } ret = gen8_ppgtt_alloc_pdp(vm, pdp, start, length); if (unlikely(ret)) goto unwind_pdp; } return 0; unwind_pdp: if (!pdp->used_pdpes) { gen8_ppgtt_set_pml4e(pml4, vm->scratch_pdp, pml4e); free_pdp(vm, pdp); } unwind: gen8_ppgtt_clear_4lvl(vm, from, start - from); return -ENOMEM; } static void gen8_dump_pdp(struct i915_hw_ppgtt *ppgtt, struct i915_page_directory_pointer *pdp, u64 start, u64 length, gen8_pte_t scratch_pte, struct seq_file *m) { struct i915_address_space *vm = &ppgtt->base; struct i915_page_directory *pd; u32 pdpe; gen8_for_each_pdpe(pd, pdp, start, length, pdpe) { struct i915_page_table *pt; u64 pd_len = length; u64 pd_start = start; u32 pde; if (pdp->page_directory[pdpe] == ppgtt->base.scratch_pd) continue; seq_printf(m, "\tPDPE #%d\n", pdpe); gen8_for_each_pde(pt, pd, pd_start, pd_len, pde) { u32 pte; gen8_pte_t *pt_vaddr; if (pd->page_table[pde] == ppgtt->base.scratch_pt) continue; pt_vaddr = kmap_atomic_px(pt); for (pte = 0; pte < GEN8_PTES; pte += 4) { u64 va = (pdpe << GEN8_PDPE_SHIFT | pde << GEN8_PDE_SHIFT | pte << GEN8_PTE_SHIFT); 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%llx [%03d,%03d,%04d]: =", va, pdpe, pde, pte); for (i = 0; i < 4; i++) { if (pt_vaddr[pte + i] != scratch_pte) seq_printf(m, " %llx", pt_vaddr[pte + i]); else seq_puts(m, " SCRATCH "); } seq_puts(m, "\n"); } kunmap_atomic(pt_vaddr); } } } static void gen8_dump_ppgtt(struct i915_hw_ppgtt *ppgtt, struct seq_file *m) { struct i915_address_space *vm = &ppgtt->base; const gen8_pte_t scratch_pte = gen8_pte_encode(vm->scratch_page.daddr, I915_CACHE_LLC); u64 start = 0, length = ppgtt->base.total; if (use_4lvl(vm)) { u64 pml4e; struct i915_pml4 *pml4 = &ppgtt->pml4; struct i915_page_directory_pointer *pdp; gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) { if (pml4->pdps[pml4e] == ppgtt->base.scratch_pdp) continue; seq_printf(m, " PML4E #%llu\n", pml4e); gen8_dump_pdp(ppgtt, pdp, start, length, scratch_pte, m); } } else { gen8_dump_pdp(ppgtt, &ppgtt->pdp, start, length, scratch_pte, m); } } static int gen8_preallocate_top_level_pdp(struct i915_hw_ppgtt *ppgtt) { struct i915_address_space *vm = &ppgtt->base; struct i915_page_directory_pointer *pdp = &ppgtt->pdp; struct i915_page_directory *pd; u64 start = 0, length = ppgtt->base.total; u64 from = start; unsigned int pdpe; gen8_for_each_pdpe(pd, pdp, start, length, pdpe) { pd = alloc_pd(vm); if (IS_ERR(pd)) goto unwind; gen8_initialize_pd(vm, pd); gen8_ppgtt_set_pdpe(vm, pdp, pd, pdpe); pdp->used_pdpes++; } pdp->used_pdpes++; /* never remove */ return 0; unwind: start -= from; gen8_for_each_pdpe(pd, pdp, from, start, pdpe) { gen8_ppgtt_set_pdpe(vm, pdp, vm->scratch_pd, pdpe); free_pd(vm, pd); } pdp->used_pdpes = 0; return -ENOMEM; } /* * 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. * */ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt) { struct i915_address_space *vm = &ppgtt->base; struct drm_i915_private *dev_priv = vm->i915; int ret; ppgtt->base.total = USES_FULL_48BIT_PPGTT(dev_priv) ? 1ULL << 48 : 1ULL << 32; /* There are only few exceptions for gen >=6. chv and bxt. * And we are not sure about the latter so play safe for now. */ if (IS_CHERRYVIEW(dev_priv) || IS_BROXTON(dev_priv)) ppgtt->base.pt_kmap_wc = true; ret = gen8_init_scratch(&ppgtt->base); if (ret) { ppgtt->base.total = 0; return ret; } if (use_4lvl(vm)) { ret = setup_px(&ppgtt->base, &ppgtt->pml4); if (ret) goto free_scratch; gen8_initialize_pml4(&ppgtt->base, &ppgtt->pml4); ppgtt->switch_mm = gen8_mm_switch_4lvl; ppgtt->base.allocate_va_range = gen8_ppgtt_alloc_4lvl; ppgtt->base.insert_entries = gen8_ppgtt_insert_4lvl; ppgtt->base.clear_range = gen8_ppgtt_clear_4lvl; } else { ret = __pdp_init(&ppgtt->base, &ppgtt->pdp); if (ret) goto free_scratch; if (intel_vgpu_active(dev_priv)) { ret = gen8_preallocate_top_level_pdp(ppgtt); if (ret) { __pdp_fini(&ppgtt->pdp); goto free_scratch; } } ppgtt->switch_mm = gen8_mm_switch_3lvl; ppgtt->base.allocate_va_range = gen8_ppgtt_alloc_3lvl; ppgtt->base.insert_entries = gen8_ppgtt_insert_3lvl; ppgtt->base.clear_range = gen8_ppgtt_clear_3lvl; } if (intel_vgpu_active(dev_priv)) gen8_ppgtt_notify_vgt(ppgtt, true); ppgtt->base.cleanup = gen8_ppgtt_cleanup; ppgtt->base.unbind_vma = ppgtt_unbind_vma; ppgtt->base.bind_vma = ppgtt_bind_vma; ppgtt->base.set_pages = ppgtt_set_pages; ppgtt->base.clear_pages = clear_pages; ppgtt->debug_dump = gen8_dump_ppgtt; return 0; free_scratch: gen8_free_scratch(&ppgtt->base); return ret; } static void gen6_dump_ppgtt(struct i915_hw_ppgtt *ppgtt, struct seq_file *m) { struct i915_address_space *vm = &ppgtt->base; struct i915_page_table *unused; gen6_pte_t scratch_pte; u32 pd_entry, pte, pde; u32 start = 0, length = ppgtt->base.total; scratch_pte = vm->pte_encode(vm->scratch_page.daddr, I915_CACHE_LLC, 0); gen6_for_each_pde(unused, &ppgtt->pd, start, length, pde) { u32 expected; gen6_pte_t *pt_vaddr; const dma_addr_t pt_addr = px_dma(ppgtt->pd.page_table[pde]); pd_entry = readl(ppgtt->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_px(ppgtt->pd.page_table[pde]); for (pte = 0; pte < GEN6_PTES; pte+=4) { unsigned long va = (pde * PAGE_SIZE * GEN6_PTES) + (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); } } /* Write pde (index) from the page directory @pd to the page table @pt */ static inline void gen6_write_pde(const struct i915_hw_ppgtt *ppgtt, const unsigned int pde, const struct i915_page_table *pt) { /* Caller needs to make sure the write completes if necessary */ writel_relaxed(GEN6_PDE_ADDR_ENCODE(px_dma(pt)) | GEN6_PDE_VALID, ppgtt->pd_addr + pde); } /* Write all the page tables found in the ppgtt structure to incrementing page * directories. */ static void gen6_write_page_range(struct i915_hw_ppgtt *ppgtt, u32 start, u32 length) { struct i915_page_table *pt; unsigned int pde; gen6_for_each_pde(pt, &ppgtt->pd, start, length, pde) gen6_write_pde(ppgtt, pde, pt); mark_tlbs_dirty(ppgtt); wmb(); } static inline u32 get_pd_offset(struct i915_hw_ppgtt *ppgtt) { GEM_BUG_ON(ppgtt->pd.base.ggtt_offset & 0x3f); return ppgtt->pd.base.ggtt_offset << 10; } static int hsw_mm_switch(struct i915_hw_ppgtt *ppgtt, struct drm_i915_gem_request *req) { struct intel_engine_cs *engine = req->engine; u32 *cs; /* NB: TLBs must be flushed and invalidated before a switch */ cs = intel_ring_begin(req, 6); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = MI_LOAD_REGISTER_IMM(2); *cs++ = i915_mmio_reg_offset(RING_PP_DIR_DCLV(engine)); *cs++ = PP_DIR_DCLV_2G; *cs++ = i915_mmio_reg_offset(RING_PP_DIR_BASE(engine)); *cs++ = get_pd_offset(ppgtt); *cs++ = MI_NOOP; intel_ring_advance(req, cs); return 0; } static int gen7_mm_switch(struct i915_hw_ppgtt *ppgtt, struct drm_i915_gem_request *req) { struct intel_engine_cs *engine = req->engine; u32 *cs; /* NB: TLBs must be flushed and invalidated before a switch */ cs = intel_ring_begin(req, 6); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = MI_LOAD_REGISTER_IMM(2); *cs++ = i915_mmio_reg_offset(RING_PP_DIR_DCLV(engine)); *cs++ = PP_DIR_DCLV_2G; *cs++ = i915_mmio_reg_offset(RING_PP_DIR_BASE(engine)); *cs++ = get_pd_offset(ppgtt); *cs++ = MI_NOOP; intel_ring_advance(req, cs); return 0; } static int gen6_mm_switch(struct i915_hw_ppgtt *ppgtt, struct drm_i915_gem_request *req) { struct intel_engine_cs *engine = req->engine; struct drm_i915_private *dev_priv = req->i915; I915_WRITE(RING_PP_DIR_DCLV(engine), PP_DIR_DCLV_2G); I915_WRITE(RING_PP_DIR_BASE(engine), get_pd_offset(ppgtt)); return 0; } static void gen8_ppgtt_enable(struct drm_i915_private *dev_priv) { struct intel_engine_cs *engine; enum intel_engine_id id; for_each_engine(engine, dev_priv, id) { u32 four_level = USES_FULL_48BIT_PPGTT(dev_priv) ? GEN8_GFX_PPGTT_48B : 0; I915_WRITE(RING_MODE_GEN7(engine), _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE | four_level)); } } static void gen7_ppgtt_enable(struct drm_i915_private *dev_priv) { struct intel_engine_cs *engine; u32 ecochk, ecobits; enum intel_engine_id id; ecobits = I915_READ(GAC_ECO_BITS); I915_WRITE(GAC_ECO_BITS, ecobits | ECOBITS_PPGTT_CACHE64B); ecochk = I915_READ(GAM_ECOCHK); if (IS_HASWELL(dev_priv)) { ecochk |= ECOCHK_PPGTT_WB_HSW; } else { ecochk |= ECOCHK_PPGTT_LLC_IVB; ecochk &= ~ECOCHK_PPGTT_GFDT_IVB; } I915_WRITE(GAM_ECOCHK, ecochk); for_each_engine(engine, dev_priv, id) { /* GFX_MODE is per-ring on gen7+ */ I915_WRITE(RING_MODE_GEN7(engine), _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE)); } } static void gen6_ppgtt_enable(struct drm_i915_private *dev_priv) { u32 ecochk, gab_ctl, ecobits; 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)); } /* PPGTT support for Sandybdrige/Gen6 and later */ static void gen6_ppgtt_clear_range(struct i915_address_space *vm, u64 start, u64 length) { struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm); unsigned int first_entry = start >> PAGE_SHIFT; unsigned int pde = first_entry / GEN6_PTES; unsigned int pte = first_entry % GEN6_PTES; unsigned int num_entries = length >> PAGE_SHIFT; gen6_pte_t scratch_pte = vm->pte_encode(vm->scratch_page.daddr, I915_CACHE_LLC, 0); while (num_entries) { struct i915_page_table *pt = ppgtt->pd.page_table[pde++]; unsigned int end = min(pte + num_entries, GEN6_PTES); gen6_pte_t *vaddr; num_entries -= end - pte; /* Note that the hw doesn't support removing PDE on the fly * (they are cached inside the context with no means to * invalidate the cache), so we can only reset the PTE * entries back to scratch. */ vaddr = kmap_atomic_px(pt); do { vaddr[pte++] = scratch_pte; } while (pte < end); kunmap_atomic(vaddr); pte = 0; } } static void gen6_ppgtt_insert_entries(struct i915_address_space *vm, struct i915_vma *vma, enum i915_cache_level cache_level, u32 flags) { struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm); unsigned first_entry = vma->node.start >> PAGE_SHIFT; unsigned act_pt = first_entry / GEN6_PTES; unsigned act_pte = first_entry % GEN6_PTES; const u32 pte_encode = vm->pte_encode(0, cache_level, flags); struct sgt_dma iter = sgt_dma(vma); gen6_pte_t *vaddr; vaddr = kmap_atomic_px(ppgtt->pd.page_table[act_pt]); do { vaddr[act_pte] = pte_encode | GEN6_PTE_ADDR_ENCODE(iter.dma); iter.dma += PAGE_SIZE; if (iter.dma == iter.max) { iter.sg = __sg_next(iter.sg); if (!iter.sg) break; iter.dma = sg_dma_address(iter.sg); iter.max = iter.dma + iter.sg->length; } if (++act_pte == GEN6_PTES) { kunmap_atomic(vaddr); vaddr = kmap_atomic_px(ppgtt->pd.page_table[++act_pt]); act_pte = 0; } } while (1); kunmap_atomic(vaddr); vma->page_sizes.gtt = I915_GTT_PAGE_SIZE; } static int gen6_alloc_va_range(struct i915_address_space *vm, u64 start, u64 length) { struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm); struct i915_page_table *pt; u64 from = start; unsigned int pde; bool flush = false; gen6_for_each_pde(pt, &ppgtt->pd, start, length, pde) { if (pt == vm->scratch_pt) { pt = alloc_pt(vm); if (IS_ERR(pt)) goto unwind_out; gen6_initialize_pt(vm, pt); ppgtt->pd.page_table[pde] = pt; gen6_write_pde(ppgtt, pde, pt); flush = true; } } if (flush) { mark_tlbs_dirty(ppgtt); wmb(); } return 0; unwind_out: gen6_ppgtt_clear_range(vm, from, start); return -ENOMEM; } static int gen6_init_scratch(struct i915_address_space *vm) { int ret; ret = setup_scratch_page(vm, I915_GFP_DMA); if (ret) return ret; vm->scratch_pt = alloc_pt(vm); if (IS_ERR(vm->scratch_pt)) { cleanup_scratch_page(vm); return PTR_ERR(vm->scratch_pt); } gen6_initialize_pt(vm, vm->scratch_pt); return 0; } static void gen6_free_scratch(struct i915_address_space *vm) { free_pt(vm, vm->scratch_pt); cleanup_scratch_page(vm); } static void gen6_ppgtt_cleanup(struct i915_address_space *vm) { struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm); struct i915_page_directory *pd = &ppgtt->pd; struct i915_page_table *pt; u32 pde; drm_mm_remove_node(&ppgtt->node); gen6_for_all_pdes(pt, pd, pde) if (pt != vm->scratch_pt) free_pt(vm, pt); gen6_free_scratch(vm); } static int gen6_ppgtt_allocate_page_directories(struct i915_hw_ppgtt *ppgtt) { struct i915_address_space *vm = &ppgtt->base; struct drm_i915_private *dev_priv = ppgtt->base.i915; struct i915_ggtt *ggtt = &dev_priv->ggtt; 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(&ggtt->base.mm)); ret = gen6_init_scratch(vm); if (ret) return ret; ret = i915_gem_gtt_insert(&ggtt->base, &ppgtt->node, GEN6_PD_SIZE, GEN6_PD_ALIGN, I915_COLOR_UNEVICTABLE, 0, ggtt->base.total, PIN_HIGH); if (ret) goto err_out; if (ppgtt->node.start < ggtt->mappable_end) DRM_DEBUG("Forced to use aperture for PDEs\n"); ppgtt->pd.base.ggtt_offset = ppgtt->node.start / PAGE_SIZE * sizeof(gen6_pte_t); ppgtt->pd_addr = (gen6_pte_t __iomem *)ggtt->gsm + ppgtt->pd.base.ggtt_offset / sizeof(gen6_pte_t); return 0; err_out: gen6_free_scratch(vm); return ret; } static int gen6_ppgtt_alloc(struct i915_hw_ppgtt *ppgtt) { return gen6_ppgtt_allocate_page_directories(ppgtt); } static void gen6_scratch_va_range(struct i915_hw_ppgtt *ppgtt, u64 start, u64 length) { struct i915_page_table *unused; u32 pde; gen6_for_each_pde(unused, &ppgtt->pd, start, length, pde) ppgtt->pd.page_table[pde] = ppgtt->base.scratch_pt; } static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt) { struct drm_i915_private *dev_priv = ppgtt->base.i915; struct i915_ggtt *ggtt = &dev_priv->ggtt; int ret; ppgtt->base.pte_encode = ggtt->base.pte_encode; if (intel_vgpu_active(dev_priv) || IS_GEN6(dev_priv)) ppgtt->switch_mm = gen6_mm_switch; else if (IS_HASWELL(dev_priv)) ppgtt->switch_mm = hsw_mm_switch; else if (IS_GEN7(dev_priv)) ppgtt->switch_mm = gen7_mm_switch; else BUG(); ret = gen6_ppgtt_alloc(ppgtt); if (ret) return ret; ppgtt->base.total = I915_PDES * GEN6_PTES * PAGE_SIZE; gen6_scratch_va_range(ppgtt, 0, ppgtt->base.total); gen6_write_page_range(ppgtt, 0, ppgtt->base.total); ret = gen6_alloc_va_range(&ppgtt->base, 0, ppgtt->base.total); if (ret) { gen6_ppgtt_cleanup(&ppgtt->base); return ret; } ppgtt->base.clear_range = gen6_ppgtt_clear_range; ppgtt->base.insert_entries = gen6_ppgtt_insert_entries; ppgtt->base.unbind_vma = ppgtt_unbind_vma; ppgtt->base.bind_vma = ppgtt_bind_vma; ppgtt->base.set_pages = ppgtt_set_pages; ppgtt->base.clear_pages = clear_pages; ppgtt->base.cleanup = gen6_ppgtt_cleanup; ppgtt->debug_dump = gen6_dump_ppgtt; DRM_DEBUG_DRIVER("Allocated pde space (%lldM) at GTT entry: %llx\n", ppgtt->node.size >> 20, ppgtt->node.start / PAGE_SIZE); DRM_DEBUG_DRIVER("Adding PPGTT at offset %x\n", ppgtt->pd.base.ggtt_offset << 10); return 0; } static int __hw_ppgtt_init(struct i915_hw_ppgtt *ppgtt, struct drm_i915_private *dev_priv) { ppgtt->base.i915 = dev_priv; ppgtt->base.dma = &dev_priv->drm.pdev->dev; if (INTEL_INFO(dev_priv)->gen < 8) return gen6_ppgtt_init(ppgtt); else return gen8_ppgtt_init(ppgtt); } static void i915_address_space_init(struct i915_address_space *vm, struct drm_i915_private *dev_priv, const char *name) { i915_gem_timeline_init(dev_priv, &vm->timeline, name); drm_mm_init(&vm->mm, 0, vm->total); vm->mm.head_node.color = I915_COLOR_UNEVICTABLE; INIT_LIST_HEAD(&vm->active_list); INIT_LIST_HEAD(&vm->inactive_list); INIT_LIST_HEAD(&vm->unbound_list); list_add_tail(&vm->global_link, &dev_priv->vm_list); pagevec_init(&vm->free_pages); } static void i915_address_space_fini(struct i915_address_space *vm) { if (pagevec_count(&vm->free_pages)) vm_free_pages_release(vm, true); i915_gem_timeline_fini(&vm->timeline); drm_mm_takedown(&vm->mm); list_del(&vm->global_link); } static void gtt_write_workarounds(struct drm_i915_private *dev_priv) { /* This function is for gtt related workarounds. This function is * called on driver load and after a GPU reset, so you can place * workarounds here even if they get overwritten by GPU reset. */ /* WaIncreaseDefaultTLBEntries:chv,bdw,skl,bxt,kbl,glk,cfl,cnl */ if (IS_BROADWELL(dev_priv)) I915_WRITE(GEN8_L3_LRA_1_GPGPU, GEN8_L3_LRA_1_GPGPU_DEFAULT_VALUE_BDW); else if (IS_CHERRYVIEW(dev_priv)) I915_WRITE(GEN8_L3_LRA_1_GPGPU, GEN8_L3_LRA_1_GPGPU_DEFAULT_VALUE_CHV); else if (IS_GEN9_BC(dev_priv) || IS_GEN10(dev_priv)) I915_WRITE(GEN8_L3_LRA_1_GPGPU, GEN9_L3_LRA_1_GPGPU_DEFAULT_VALUE_SKL); else if (IS_GEN9_LP(dev_priv)) I915_WRITE(GEN8_L3_LRA_1_GPGPU, GEN9_L3_LRA_1_GPGPU_DEFAULT_VALUE_BXT); /* * To support 64K PTEs we need to first enable the use of the * Intermediate-Page-Size(IPS) bit of the PDE field via some magical * mmio, otherwise the page-walker will simply ignore the IPS bit. This * shouldn't be needed after GEN10. * * 64K pages were first introduced from BDW+, although technically they * only *work* from gen9+. For pre-BDW we instead have the option for * 32K pages, but we don't currently have any support for it in our * driver. */ if (HAS_PAGE_SIZES(dev_priv, I915_GTT_PAGE_SIZE_64K) && INTEL_GEN(dev_priv) <= 10) I915_WRITE(GEN8_GAMW_ECO_DEV_RW_IA, I915_READ(GEN8_GAMW_ECO_DEV_RW_IA) | GAMW_ECO_ENABLE_64K_IPS_FIELD); } int i915_ppgtt_init_hw(struct drm_i915_private *dev_priv) { gtt_write_workarounds(dev_priv); /* In the case of execlists, PPGTT is enabled by the context descriptor * and the PDPs are contained within the context itself. We don't * need to do anything here. */ if (HAS_LOGICAL_RING_CONTEXTS(dev_priv)) return 0; if (!USES_PPGTT(dev_priv)) return 0; if (IS_GEN6(dev_priv)) gen6_ppgtt_enable(dev_priv); else if (IS_GEN7(dev_priv)) gen7_ppgtt_enable(dev_priv); else if (INTEL_GEN(dev_priv) >= 8) gen8_ppgtt_enable(dev_priv); else MISSING_CASE(INTEL_GEN(dev_priv)); return 0; } struct i915_hw_ppgtt * i915_ppgtt_create(struct drm_i915_private *dev_priv, struct drm_i915_file_private *fpriv, const char *name) { struct i915_hw_ppgtt *ppgtt; int ret; ppgtt = kzalloc(sizeof(*ppgtt), GFP_KERNEL); if (!ppgtt) return ERR_PTR(-ENOMEM); ret = __hw_ppgtt_init(ppgtt, dev_priv); if (ret) { kfree(ppgtt); return ERR_PTR(ret); } kref_init(&ppgtt->ref); i915_address_space_init(&ppgtt->base, dev_priv, name); ppgtt->base.file = fpriv; trace_i915_ppgtt_create(&ppgtt->base); return ppgtt; } void i915_ppgtt_close(struct i915_address_space *vm) { struct list_head *phases[] = { &vm->active_list, &vm->inactive_list, &vm->unbound_list, NULL, }, **phase; GEM_BUG_ON(vm->closed); vm->closed = true; for (phase = phases; *phase; phase++) { struct i915_vma *vma, *vn; list_for_each_entry_safe(vma, vn, *phase, vm_link) if (!i915_vma_is_closed(vma)) i915_vma_close(vma); } } void i915_ppgtt_release(struct kref *kref) { struct i915_hw_ppgtt *ppgtt = container_of(kref, struct i915_hw_ppgtt, ref); trace_i915_ppgtt_release(&ppgtt->base); /* vmas should already be unbound and destroyed */ WARN_ON(!list_empty(&ppgtt->base.active_list)); WARN_ON(!list_empty(&ppgtt->base.inactive_list)); WARN_ON(!list_empty(&ppgtt->base.unbound_list)); ppgtt->base.cleanup(&ppgtt->base); i915_address_space_fini(&ppgtt->base); kfree(ppgtt); } /* Certain Gen5 chipsets require require idling the GPU before * unmapping anything from the GTT when VT-d is enabled. */ static bool needs_idle_maps(struct drm_i915_private *dev_priv) { /* Query intel_iommu to see if we need the workaround. Presumably that * was loaded first. */ return IS_GEN5(dev_priv) && IS_MOBILE(dev_priv) && intel_vtd_active(); } static void gen6_check_and_clear_faults(struct drm_i915_private *dev_priv) { struct intel_engine_cs *engine; enum intel_engine_id id; u32 fault; for_each_engine(engine, dev_priv, id) { fault = I915_READ(RING_FAULT_REG(engine)); if (fault & 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 & PAGE_MASK, fault & RING_FAULT_GTTSEL_MASK ? "GGTT" : "PPGTT", RING_FAULT_SRCID(fault), RING_FAULT_FAULT_TYPE(fault)); I915_WRITE(RING_FAULT_REG(engine), fault & ~RING_FAULT_VALID); } } POSTING_READ(RING_FAULT_REG(dev_priv->engine[RCS])); } static void gen8_check_and_clear_faults(struct drm_i915_private *dev_priv) { u32 fault = I915_READ(GEN8_RING_FAULT_REG); if (fault & RING_FAULT_VALID) { DRM_DEBUG_DRIVER("Unexpected fault\n" "\tAddr: 0x%08lx\n" "\tEngine ID: %d\n" "\tSource ID: %d\n" "\tType: %d\n", fault & PAGE_MASK, GEN8_RING_FAULT_ENGINE_ID(fault), RING_FAULT_SRCID(fault), RING_FAULT_FAULT_TYPE(fault)); I915_WRITE(GEN8_RING_FAULT_REG, fault & ~RING_FAULT_VALID); } POSTING_READ(GEN8_RING_FAULT_REG); } void i915_check_and_clear_faults(struct drm_i915_private *dev_priv) { /* From GEN8 onwards we only have one 'All Engine Fault Register' */ if (INTEL_GEN(dev_priv) >= 8) gen8_check_and_clear_faults(dev_priv); else if (INTEL_GEN(dev_priv) >= 6) gen6_check_and_clear_faults(dev_priv); else return; } void i915_gem_suspend_gtt_mappings(struct drm_i915_private *dev_priv) { struct i915_ggtt *ggtt = &dev_priv->ggtt; /* Don't bother messing with faults pre GEN6 as we have little * documentation supporting that it's a good idea. */ if (INTEL_GEN(dev_priv) < 6) return; i915_check_and_clear_faults(dev_priv); ggtt->base.clear_range(&ggtt->base, 0, ggtt->base.total); i915_ggtt_invalidate(dev_priv); } int i915_gem_gtt_prepare_pages(struct drm_i915_gem_object *obj, struct sg_table *pages) { do { if (dma_map_sg(&obj->base.dev->pdev->dev, pages->sgl, pages->nents, PCI_DMA_BIDIRECTIONAL)) return 0; /* If the DMA remap fails, one cause can be that we have * too many objects pinned in a small remapping table, * such as swiotlb. Incrementally purge all other objects and * try again - if there are no more pages to remove from * the DMA remapper, i915_gem_shrink will return 0. */ GEM_BUG_ON(obj->mm.pages == pages); } while (i915_gem_shrink(to_i915(obj->base.dev), obj->base.size >> PAGE_SHIFT, NULL, I915_SHRINK_BOUND | I915_SHRINK_UNBOUND | I915_SHRINK_ACTIVE)); return -ENOSPC; } static void gen8_set_pte(void __iomem *addr, gen8_pte_t pte) { writeq(pte, addr); } static void gen8_ggtt_insert_page(struct i915_address_space *vm, dma_addr_t addr, u64 offset, enum i915_cache_level level, u32 unused) { struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm); gen8_pte_t __iomem *pte = (gen8_pte_t __iomem *)ggtt->gsm + (offset >> PAGE_SHIFT); gen8_set_pte(pte, gen8_pte_encode(addr, level)); ggtt->invalidate(vm->i915); } static void gen8_ggtt_insert_entries(struct i915_address_space *vm, struct i915_vma *vma, enum i915_cache_level level, u32 unused) { struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm); struct sgt_iter sgt_iter; gen8_pte_t __iomem *gtt_entries; const gen8_pte_t pte_encode = gen8_pte_encode(0, level); dma_addr_t addr; gtt_entries = (gen8_pte_t __iomem *)ggtt->gsm; gtt_entries += vma->node.start >> PAGE_SHIFT; for_each_sgt_dma(addr, sgt_iter, vma->pages) gen8_set_pte(gtt_entries++, pte_encode | addr); wmb(); /* 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. */ ggtt->invalidate(vm->i915); } static void gen6_ggtt_insert_page(struct i915_address_space *vm, dma_addr_t addr, u64 offset, enum i915_cache_level level, u32 flags) { struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm); gen6_pte_t __iomem *pte = (gen6_pte_t __iomem *)ggtt->gsm + (offset >> PAGE_SHIFT); iowrite32(vm->pte_encode(addr, level, flags), pte); ggtt->invalidate(vm->i915); } /* * 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 i915_vma *vma, enum i915_cache_level level, u32 flags) { struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm); gen6_pte_t __iomem *entries = (gen6_pte_t __iomem *)ggtt->gsm; unsigned int i = vma->node.start >> PAGE_SHIFT; struct sgt_iter iter; dma_addr_t addr; for_each_sgt_dma(addr, iter, vma->pages) iowrite32(vm->pte_encode(addr, level, flags), &entries[i++]); wmb(); /* 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. */ ggtt->invalidate(vm->i915); } static void nop_clear_range(struct i915_address_space *vm, u64 start, u64 length) { } static void gen8_ggtt_clear_range(struct i915_address_space *vm, u64 start, u64 length) { struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm); unsigned first_entry = start >> PAGE_SHIFT; unsigned num_entries = length >> PAGE_SHIFT; const gen8_pte_t scratch_pte = gen8_pte_encode(vm->scratch_page.daddr, I915_CACHE_LLC); gen8_pte_t __iomem *gtt_base = (gen8_pte_t __iomem *)ggtt->gsm + first_entry; const int max_entries = ggtt_total_entries(ggtt) - 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; for (i = 0; i < num_entries; i++) gen8_set_pte(>t_base[i], scratch_pte); } static void bxt_vtd_ggtt_wa(struct i915_address_space *vm) { struct drm_i915_private *dev_priv = vm->i915; /* * Make sure the internal GAM fifo has been cleared of all GTT * writes before exiting stop_machine(). This guarantees that * any aperture accesses waiting to start in another process * cannot back up behind the GTT writes causing a hang. * The register can be any arbitrary GAM register. */ POSTING_READ(GFX_FLSH_CNTL_GEN6); } struct insert_page { struct i915_address_space *vm; dma_addr_t addr; u64 offset; enum i915_cache_level level; }; static int bxt_vtd_ggtt_insert_page__cb(void *_arg) { struct insert_page *arg = _arg; gen8_ggtt_insert_page(arg->vm, arg->addr, arg->offset, arg->level, 0); bxt_vtd_ggtt_wa(arg->vm); return 0; } static void bxt_vtd_ggtt_insert_page__BKL(struct i915_address_space *vm, dma_addr_t addr, u64 offset, enum i915_cache_level level, u32 unused) { struct insert_page arg = { vm, addr, offset, level }; stop_machine(bxt_vtd_ggtt_insert_page__cb, &arg, NULL); } struct insert_entries { struct i915_address_space *vm; struct i915_vma *vma; enum i915_cache_level level; }; static int bxt_vtd_ggtt_insert_entries__cb(void *_arg) { struct insert_entries *arg = _arg; gen8_ggtt_insert_entries(arg->vm, arg->vma, arg->level, 0); bxt_vtd_ggtt_wa(arg->vm); return 0; } static void bxt_vtd_ggtt_insert_entries__BKL(struct i915_address_space *vm, struct i915_vma *vma, enum i915_cache_level level, u32 unused) { struct insert_entries arg = { vm, vma, level }; stop_machine(bxt_vtd_ggtt_insert_entries__cb, &arg, NULL); } struct clear_range { struct i915_address_space *vm; u64 start; u64 length; }; static int bxt_vtd_ggtt_clear_range__cb(void *_arg) { struct clear_range *arg = _arg; gen8_ggtt_clear_range(arg->vm, arg->start, arg->length); bxt_vtd_ggtt_wa(arg->vm); return 0; } static void bxt_vtd_ggtt_clear_range__BKL(struct i915_address_space *vm, u64 start, u64 length) { struct clear_range arg = { vm, start, length }; stop_machine(bxt_vtd_ggtt_clear_range__cb, &arg, NULL); } static void gen6_ggtt_clear_range(struct i915_address_space *vm, u64 start, u64 length) { struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm); unsigned first_entry = start >> PAGE_SHIFT; unsigned num_entries = length >> PAGE_SHIFT; gen6_pte_t scratch_pte, __iomem *gtt_base = (gen6_pte_t __iomem *)ggtt->gsm + first_entry; const int max_entries = ggtt_total_entries(ggtt) - 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_page.daddr, I915_CACHE_LLC, 0); for (i = 0; i < num_entries; i++) iowrite32(scratch_pte, >t_base[i]); } static void i915_ggtt_insert_page(struct i915_address_space *vm, dma_addr_t addr, u64 offset, enum i915_cache_level cache_level, u32 unused) { unsigned int flags = (cache_level == I915_CACHE_NONE) ? AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY; intel_gtt_insert_page(addr, offset >> PAGE_SHIFT, flags); } static void i915_ggtt_insert_entries(struct i915_address_space *vm, struct i915_vma *vma, enum i915_cache_level cache_level, u32 unused) { unsigned int flags = (cache_level == I915_CACHE_NONE) ? AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY; intel_gtt_insert_sg_entries(vma->pages, vma->node.start >> PAGE_SHIFT, flags); } static void i915_ggtt_clear_range(struct i915_address_space *vm, u64 start, u64 length) { intel_gtt_clear_range(start >> PAGE_SHIFT, length >> PAGE_SHIFT); } static int ggtt_bind_vma(struct i915_vma *vma, enum i915_cache_level cache_level, u32 flags) { struct drm_i915_private *i915 = vma->vm->i915; struct drm_i915_gem_object *obj = vma->obj; u32 pte_flags; /* Currently applicable only to VLV */ pte_flags = 0; if (obj->gt_ro) pte_flags |= PTE_READ_ONLY; intel_runtime_pm_get(i915); vma->vm->insert_entries(vma->vm, vma, cache_level, pte_flags); intel_runtime_pm_put(i915); vma->page_sizes.gtt = I915_GTT_PAGE_SIZE; /* * Without aliasing PPGTT there's no difference between * GLOBAL/LOCAL_BIND, it's all the same ptes. Hence unconditionally * upgrade to both bound if we bind either to avoid double-binding. */ vma->flags |= I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND; return 0; } static void ggtt_unbind_vma(struct i915_vma *vma) { struct drm_i915_private *i915 = vma->vm->i915; intel_runtime_pm_get(i915); vma->vm->clear_range(vma->vm, vma->node.start, vma->size); intel_runtime_pm_put(i915); } static int aliasing_gtt_bind_vma(struct i915_vma *vma, enum i915_cache_level cache_level, u32 flags) { struct drm_i915_private *i915 = vma->vm->i915; u32 pte_flags; int ret; /* Currently applicable only to VLV */ pte_flags = 0; if (vma->obj->gt_ro) pte_flags |= PTE_READ_ONLY; if (flags & I915_VMA_LOCAL_BIND) { struct i915_hw_ppgtt *appgtt = i915->mm.aliasing_ppgtt; if (!(vma->flags & I915_VMA_LOCAL_BIND) && appgtt->base.allocate_va_range) { ret = appgtt->base.allocate_va_range(&appgtt->base, vma->node.start, vma->size); if (ret) return ret; } appgtt->base.insert_entries(&appgtt->base, vma, cache_level, pte_flags); } if (flags & I915_VMA_GLOBAL_BIND) { intel_runtime_pm_get(i915); vma->vm->insert_entries(vma->vm, vma, cache_level, pte_flags); intel_runtime_pm_put(i915); } return 0; } static void aliasing_gtt_unbind_vma(struct i915_vma *vma) { struct drm_i915_private *i915 = vma->vm->i915; if (vma->flags & I915_VMA_GLOBAL_BIND) { intel_runtime_pm_get(i915); vma->vm->clear_range(vma->vm, vma->node.start, vma->size); intel_runtime_pm_put(i915); } if (vma->flags & I915_VMA_LOCAL_BIND) { struct i915_address_space *vm = &i915->mm.aliasing_ppgtt->base; vm->clear_range(vm, vma->node.start, vma->size); } } void i915_gem_gtt_finish_pages(struct drm_i915_gem_object *obj, struct sg_table *pages) { struct drm_i915_private *dev_priv = to_i915(obj->base.dev); struct device *kdev = &dev_priv->drm.pdev->dev; struct i915_ggtt *ggtt = &dev_priv->ggtt; if (unlikely(ggtt->do_idle_maps)) { if (i915_gem_wait_for_idle(dev_priv, 0)) { DRM_ERROR("Failed to wait for idle; VT'd may hang.\n"); /* Wait a bit, in hopes it avoids the hang */ udelay(10); } } dma_unmap_sg(kdev, pages->sgl, pages->nents, PCI_DMA_BIDIRECTIONAL); } static int ggtt_set_pages(struct i915_vma *vma) { int ret; GEM_BUG_ON(vma->pages); ret = i915_get_ggtt_vma_pages(vma); if (ret) return ret; vma->page_sizes = vma->obj->mm.page_sizes; return 0; } static void i915_gtt_color_adjust(const struct drm_mm_node *node, unsigned long color, u64 *start, u64 *end) { if (node->allocated && node->color != color) *start += I915_GTT_PAGE_SIZE; /* Also leave a space between the unallocated reserved node after the * GTT and any objects within the GTT, i.e. we use the color adjustment * to insert a guard page to prevent prefetches crossing over the * GTT boundary. */ node = list_next_entry(node, node_list); if (node->color != color) *end -= I915_GTT_PAGE_SIZE; } int i915_gem_init_aliasing_ppgtt(struct drm_i915_private *i915) { struct i915_ggtt *ggtt = &i915->ggtt; struct i915_hw_ppgtt *ppgtt; int err; ppgtt = i915_ppgtt_create(i915, ERR_PTR(-EPERM), "[alias]"); if (IS_ERR(ppgtt)) return PTR_ERR(ppgtt); if (WARN_ON(ppgtt->base.total < ggtt->base.total)) { err = -ENODEV; goto err_ppgtt; } if (ppgtt->base.allocate_va_range) { /* Note we only pre-allocate as far as the end of the global * GTT. On 48b / 4-level page-tables, the difference is very, * very significant! We have to preallocate as GVT/vgpu does * not like the page directory disappearing. */ err = ppgtt->base.allocate_va_range(&ppgtt->base, 0, ggtt->base.total); if (err) goto err_ppgtt; } i915->mm.aliasing_ppgtt = ppgtt; WARN_ON(ggtt->base.bind_vma != ggtt_bind_vma); ggtt->base.bind_vma = aliasing_gtt_bind_vma; WARN_ON(ggtt->base.unbind_vma != ggtt_unbind_vma); ggtt->base.unbind_vma = aliasing_gtt_unbind_vma; return 0; err_ppgtt: i915_ppgtt_put(ppgtt); return err; } void i915_gem_fini_aliasing_ppgtt(struct drm_i915_private *i915) { struct i915_ggtt *ggtt = &i915->ggtt; struct i915_hw_ppgtt *ppgtt; ppgtt = fetch_and_zero(&i915->mm.aliasing_ppgtt); if (!ppgtt) return; i915_ppgtt_put(ppgtt); ggtt->base.bind_vma = ggtt_bind_vma; ggtt->base.unbind_vma = ggtt_unbind_vma; } int i915_gem_init_ggtt(struct drm_i915_private *dev_priv) { /* 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 i915_ggtt *ggtt = &dev_priv->ggtt; unsigned long hole_start, hole_end; struct drm_mm_node *entry; int ret; ret = intel_vgt_balloon(dev_priv); if (ret) return ret; /* Reserve a mappable slot for our lockless error capture */ ret = drm_mm_insert_node_in_range(&ggtt->base.mm, &ggtt->error_capture, PAGE_SIZE, 0, I915_COLOR_UNEVICTABLE, 0, ggtt->mappable_end, DRM_MM_INSERT_LOW); if (ret) return ret; /* Clear any non-preallocated blocks */ drm_mm_for_each_hole(entry, &ggtt->base.mm, hole_start, hole_end) { DRM_DEBUG_KMS("clearing unused GTT space: [%lx, %lx]\n", hole_start, hole_end); ggtt->base.clear_range(&ggtt->base, hole_start, hole_end - hole_start); } /* And finally clear the reserved guard page */ ggtt->base.clear_range(&ggtt->base, ggtt->base.total - PAGE_SIZE, PAGE_SIZE); if (USES_PPGTT(dev_priv) && !USES_FULL_PPGTT(dev_priv)) { ret = i915_gem_init_aliasing_ppgtt(dev_priv); if (ret) goto err; } return 0; err: drm_mm_remove_node(&ggtt->error_capture); return ret; } /** * i915_ggtt_cleanup_hw - Clean up GGTT hardware initialization * @dev_priv: i915 device */ void i915_ggtt_cleanup_hw(struct drm_i915_private *dev_priv) { struct i915_ggtt *ggtt = &dev_priv->ggtt; struct i915_vma *vma, *vn; struct pagevec *pvec; ggtt->base.closed = true; mutex_lock(&dev_priv->drm.struct_mutex); WARN_ON(!list_empty(&ggtt->base.active_list)); list_for_each_entry_safe(vma, vn, &ggtt->base.inactive_list, vm_link) WARN_ON(i915_vma_unbind(vma)); mutex_unlock(&dev_priv->drm.struct_mutex); i915_gem_cleanup_stolen(&dev_priv->drm); mutex_lock(&dev_priv->drm.struct_mutex); i915_gem_fini_aliasing_ppgtt(dev_priv); if (drm_mm_node_allocated(&ggtt->error_capture)) drm_mm_remove_node(&ggtt->error_capture); if (drm_mm_initialized(&ggtt->base.mm)) { intel_vgt_deballoon(dev_priv); i915_address_space_fini(&ggtt->base); } ggtt->base.cleanup(&ggtt->base); pvec = &dev_priv->mm.wc_stash; if (pvec->nr) { set_pages_array_wb(pvec->pages, pvec->nr); __pagevec_release(pvec); } mutex_unlock(&dev_priv->drm.struct_mutex); arch_phys_wc_del(ggtt->mtrr); io_mapping_fini(&ggtt->iomap); } static 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 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; #ifdef CONFIG_X86_32 /* Limit 32b platforms to a 2GB GGTT: 4 << 20 / pte size * PAGE_SIZE */ if (bdw_gmch_ctl > 4) bdw_gmch_ctl = 4; #endif return bdw_gmch_ctl << 20; } static unsigned int chv_get_total_gtt_size(u16 gmch_ctrl) { gmch_ctrl >>= SNB_GMCH_GGMS_SHIFT; gmch_ctrl &= SNB_GMCH_GGMS_MASK; if (gmch_ctrl) return 1 << (20 + gmch_ctrl); return 0; } static int ggtt_probe_common(struct i915_ggtt *ggtt, u64 size) { struct drm_i915_private *dev_priv = ggtt->base.i915; struct pci_dev *pdev = dev_priv->drm.pdev; phys_addr_t phys_addr; int ret; /* For Modern GENs the PTEs and register space are split in the BAR */ phys_addr = pci_resource_start(pdev, 0) + pci_resource_len(pdev, 0) / 2; /* * On BXT+/CNL+ writes larger than 64 bit to the GTT pagetable range * will be dropped. For WC mappings in general we have 64 byte burst * writes when the WC buffer is flushed, so we can't use it, but have to * resort to an uncached mapping. The WC issue is easily caught by the * readback check when writing GTT PTE entries. */ if (IS_GEN9_LP(dev_priv) || INTEL_GEN(dev_priv) >= 10) ggtt->gsm = ioremap_nocache(phys_addr, size); else ggtt->gsm = ioremap_wc(phys_addr, size); if (!ggtt->gsm) { DRM_ERROR("Failed to map the ggtt page table\n"); return -ENOMEM; } ret = setup_scratch_page(&ggtt->base, GFP_DMA32); if (ret) { DRM_ERROR("Scratch setup failed\n"); /* iounmap will also get called at remove, but meh */ iounmap(ggtt->gsm); return ret; } return 0; } static struct intel_ppat_entry * __alloc_ppat_entry(struct intel_ppat *ppat, unsigned int index, u8 value) { struct intel_ppat_entry *entry = &ppat->entries[index]; GEM_BUG_ON(index >= ppat->max_entries); GEM_BUG_ON(test_bit(index, ppat->used)); entry->ppat = ppat; entry->value = value; kref_init(&entry->ref); set_bit(index, ppat->used); set_bit(index, ppat->dirty); return entry; } static void __free_ppat_entry(struct intel_ppat_entry *entry) { struct intel_ppat *ppat = entry->ppat; unsigned int index = entry - ppat->entries; GEM_BUG_ON(index >= ppat->max_entries); GEM_BUG_ON(!test_bit(index, ppat->used)); entry->value = ppat->clear_value; clear_bit(index, ppat->used); set_bit(index, ppat->dirty); } /** * intel_ppat_get - get a usable PPAT entry * @i915: i915 device instance * @value: the PPAT value required by the caller * * The function tries to search if there is an existing PPAT entry which * matches with the required value. If perfectly matched, the existing PPAT * entry will be used. If only partially matched, it will try to check if * there is any available PPAT index. If yes, it will allocate a new PPAT * index for the required entry and update the HW. If not, the partially * matched entry will be used. */ const struct intel_ppat_entry * intel_ppat_get(struct drm_i915_private *i915, u8 value) { struct intel_ppat *ppat = &i915->ppat; struct intel_ppat_entry *entry = NULL; unsigned int scanned, best_score; int i; GEM_BUG_ON(!ppat->max_entries); scanned = best_score = 0; for_each_set_bit(i, ppat->used, ppat->max_entries) { unsigned int score; score = ppat->match(ppat->entries[i].value, value); if (score > best_score) { entry = &ppat->entries[i]; if (score == INTEL_PPAT_PERFECT_MATCH) { kref_get(&entry->ref); return entry; } best_score = score; } scanned++; } if (scanned == ppat->max_entries) { if (!entry) return ERR_PTR(-ENOSPC); kref_get(&entry->ref); return entry; } i = find_first_zero_bit(ppat->used, ppat->max_entries); entry = __alloc_ppat_entry(ppat, i, value); ppat->update_hw(i915); return entry; } static void release_ppat(struct kref *kref) { struct intel_ppat_entry *entry = container_of(kref, struct intel_ppat_entry, ref); struct drm_i915_private *i915 = entry->ppat->i915; __free_ppat_entry(entry); entry->ppat->update_hw(i915); } /** * intel_ppat_put - put back the PPAT entry got from intel_ppat_get() * @entry: an intel PPAT entry * * Put back the PPAT entry got from intel_ppat_get(). If the PPAT index of the * entry is dynamically allocated, its reference count will be decreased. Once * the reference count becomes into zero, the PPAT index becomes free again. */ void intel_ppat_put(const struct intel_ppat_entry *entry) { struct intel_ppat *ppat = entry->ppat; unsigned int index = entry - ppat->entries; GEM_BUG_ON(!ppat->max_entries); kref_put(&ppat->entries[index].ref, release_ppat); } static void cnl_private_pat_update_hw(struct drm_i915_private *dev_priv) { struct intel_ppat *ppat = &dev_priv->ppat; int i; for_each_set_bit(i, ppat->dirty, ppat->max_entries) { I915_WRITE(GEN10_PAT_INDEX(i), ppat->entries[i].value); clear_bit(i, ppat->dirty); } } static void bdw_private_pat_update_hw(struct drm_i915_private *dev_priv) { struct intel_ppat *ppat = &dev_priv->ppat; u64 pat = 0; int i; for (i = 0; i < ppat->max_entries; i++) pat |= GEN8_PPAT(i, ppat->entries[i].value); bitmap_clear(ppat->dirty, 0, ppat->max_entries); I915_WRITE(GEN8_PRIVATE_PAT_LO, lower_32_bits(pat)); I915_WRITE(GEN8_PRIVATE_PAT_HI, upper_32_bits(pat)); } static unsigned int bdw_private_pat_match(u8 src, u8 dst) { unsigned int score = 0; enum { AGE_MATCH = BIT(0), TC_MATCH = BIT(1), CA_MATCH = BIT(2), }; /* Cache attribute has to be matched. */ if (GEN8_PPAT_GET_CA(src) != GEN8_PPAT_GET_CA(dst)) return 0; score |= CA_MATCH; if (GEN8_PPAT_GET_TC(src) == GEN8_PPAT_GET_TC(dst)) score |= TC_MATCH; if (GEN8_PPAT_GET_AGE(src) == GEN8_PPAT_GET_AGE(dst)) score |= AGE_MATCH; if (score == (AGE_MATCH | TC_MATCH | CA_MATCH)) return INTEL_PPAT_PERFECT_MATCH; return score; } static unsigned int chv_private_pat_match(u8 src, u8 dst) { return (CHV_PPAT_GET_SNOOP(src) == CHV_PPAT_GET_SNOOP(dst)) ? INTEL_PPAT_PERFECT_MATCH : 0; } static void cnl_setup_private_ppat(struct intel_ppat *ppat) { ppat->max_entries = 8; ppat->update_hw = cnl_private_pat_update_hw; ppat->match = bdw_private_pat_match; ppat->clear_value = GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(3); __alloc_ppat_entry(ppat, 0, GEN8_PPAT_WB | GEN8_PPAT_LLC); __alloc_ppat_entry(ppat, 1, GEN8_PPAT_WC | GEN8_PPAT_LLCELLC); __alloc_ppat_entry(ppat, 2, GEN8_PPAT_WT | GEN8_PPAT_LLCELLC); __alloc_ppat_entry(ppat, 3, GEN8_PPAT_UC); __alloc_ppat_entry(ppat, 4, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(0)); __alloc_ppat_entry(ppat, 5, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(1)); __alloc_ppat_entry(ppat, 6, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(2)); __alloc_ppat_entry(ppat, 7, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(3)); } /* 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 bdw_setup_private_ppat(struct intel_ppat *ppat) { ppat->max_entries = 8; ppat->update_hw = bdw_private_pat_update_hw; ppat->match = bdw_private_pat_match; ppat->clear_value = GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(3); if (!USES_PPGTT(ppat->i915)) { /* Spec: "For GGTT, there is NO pat_sel[2:0] from the entry, * so RTL will always use the value corresponding to * pat_sel = 000". * So let's disable cache for GGTT to avoid screen corruptions. * MOCS still can be used though. * - System agent ggtt writes (i.e. cpu gtt mmaps) already work * before this patch, i.e. the same uncached + snooping access * like on gen6/7 seems to be in effect. * - So this just fixes blitter/render access. Again it looks * like it's not just uncached access, but uncached + snooping. * So we can still hold onto all our assumptions wrt cpu * clflushing on LLC machines. */ __alloc_ppat_entry(ppat, 0, GEN8_PPAT_UC); return; } __alloc_ppat_entry(ppat, 0, GEN8_PPAT_WB | GEN8_PPAT_LLC); /* for normal objects, no eLLC */ __alloc_ppat_entry(ppat, 1, GEN8_PPAT_WC | GEN8_PPAT_LLCELLC); /* for something pointing to ptes? */ __alloc_ppat_entry(ppat, 2, GEN8_PPAT_WT | GEN8_PPAT_LLCELLC); /* for scanout with eLLC */ __alloc_ppat_entry(ppat, 3, GEN8_PPAT_UC); /* Uncached objects, mostly for scanout */ __alloc_ppat_entry(ppat, 4, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(0)); __alloc_ppat_entry(ppat, 5, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(1)); __alloc_ppat_entry(ppat, 6, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(2)); __alloc_ppat_entry(ppat, 7, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(3)); } static void chv_setup_private_ppat(struct intel_ppat *ppat) { ppat->max_entries = 8; ppat->update_hw = bdw_private_pat_update_hw; ppat->match = chv_private_pat_match; ppat->clear_value = CHV_PPAT_SNOOP; /* * Map WB on BDW to snooped on CHV. * * Only the snoop bit has meaning for CHV, the rest is * ignored. * * The hardware will never snoop for certain types of accesses: * - CPU GTT (GMADR->GGTT->no snoop->memory) * - PPGTT page tables * - some other special cycles * * As with BDW, we also need to consider the following for GT accesses: * "For GGTT, there is NO pat_sel[2:0] from the entry, * so RTL will always use the value corresponding to * pat_sel = 000". * Which means we must set the snoop bit in PAT entry 0 * in order to keep the global status page working. */ __alloc_ppat_entry(ppat, 0, CHV_PPAT_SNOOP); __alloc_ppat_entry(ppat, 1, 0); __alloc_ppat_entry(ppat, 2, 0); __alloc_ppat_entry(ppat, 3, 0); __alloc_ppat_entry(ppat, 4, CHV_PPAT_SNOOP); __alloc_ppat_entry(ppat, 5, CHV_PPAT_SNOOP); __alloc_ppat_entry(ppat, 6, CHV_PPAT_SNOOP); __alloc_ppat_entry(ppat, 7, CHV_PPAT_SNOOP); } static void gen6_gmch_remove(struct i915_address_space *vm) { struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm); iounmap(ggtt->gsm); cleanup_scratch_page(vm); } static void setup_private_pat(struct drm_i915_private *dev_priv) { struct intel_ppat *ppat = &dev_priv->ppat; int i; ppat->i915 = dev_priv; if (INTEL_GEN(dev_priv) >= 10) cnl_setup_private_ppat(ppat); else if (IS_CHERRYVIEW(dev_priv) || IS_GEN9_LP(dev_priv)) chv_setup_private_ppat(ppat); else bdw_setup_private_ppat(ppat); GEM_BUG_ON(ppat->max_entries > INTEL_MAX_PPAT_ENTRIES); for_each_clear_bit(i, ppat->used, ppat->max_entries) { ppat->entries[i].value = ppat->clear_value; ppat->entries[i].ppat = ppat; set_bit(i, ppat->dirty); } ppat->update_hw(dev_priv); } static int gen8_gmch_probe(struct i915_ggtt *ggtt) { struct drm_i915_private *dev_priv = ggtt->base.i915; struct pci_dev *pdev = dev_priv->drm.pdev; unsigned int size; u16 snb_gmch_ctl; int err; /* TODO: We're not aware of mappable constraints on gen8 yet */ ggtt->gmadr = (struct resource) DEFINE_RES_MEM(pci_resource_start(pdev, 2), pci_resource_len(pdev, 2)); ggtt->mappable_end = resource_size(&ggtt->gmadr); err = pci_set_dma_mask(pdev, DMA_BIT_MASK(39)); if (!err) err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(39)); if (err) DRM_ERROR("Can't set DMA mask/consistent mask (%d)\n", err); pci_read_config_word(pdev, SNB_GMCH_CTRL, &snb_gmch_ctl); if (INTEL_GEN(dev_priv) >= 9) { size = gen8_get_total_gtt_size(snb_gmch_ctl); } else if (IS_CHERRYVIEW(dev_priv)) { size = chv_get_total_gtt_size(snb_gmch_ctl); } else { size = gen8_get_total_gtt_size(snb_gmch_ctl); } ggtt->base.total = (size / sizeof(gen8_pte_t)) << PAGE_SHIFT; ggtt->base.cleanup = gen6_gmch_remove; ggtt->base.bind_vma = ggtt_bind_vma; ggtt->base.unbind_vma = ggtt_unbind_vma; ggtt->base.set_pages = ggtt_set_pages; ggtt->base.clear_pages = clear_pages; ggtt->base.insert_page = gen8_ggtt_insert_page; ggtt->base.clear_range = nop_clear_range; if (!USES_FULL_PPGTT(dev_priv) || intel_scanout_needs_vtd_wa(dev_priv)) ggtt->base.clear_range = gen8_ggtt_clear_range; ggtt->base.insert_entries = gen8_ggtt_insert_entries; /* Serialize GTT updates with aperture access on BXT if VT-d is on. */ if (intel_ggtt_update_needs_vtd_wa(dev_priv)) { ggtt->base.insert_entries = bxt_vtd_ggtt_insert_entries__BKL; ggtt->base.insert_page = bxt_vtd_ggtt_insert_page__BKL; if (ggtt->base.clear_range != nop_clear_range) ggtt->base.clear_range = bxt_vtd_ggtt_clear_range__BKL; } ggtt->invalidate = gen6_ggtt_invalidate; setup_private_pat(dev_priv); return ggtt_probe_common(ggtt, size); } static int gen6_gmch_probe(struct i915_ggtt *ggtt) { struct drm_i915_private *dev_priv = ggtt->base.i915; struct pci_dev *pdev = dev_priv->drm.pdev; unsigned int size; u16 snb_gmch_ctl; int err; ggtt->gmadr = (struct resource) DEFINE_RES_MEM(pci_resource_start(pdev, 2), pci_resource_len(pdev, 2)); ggtt->mappable_end = resource_size(&ggtt->gmadr); /* 64/512MB is the current min/max we actually know of, but this is just * a coarse sanity check. */ if (ggtt->mappable_end < (64<<20) || ggtt->mappable_end > (512<<20)) { DRM_ERROR("Unknown GMADR size (%pa)\n", &ggtt->mappable_end); return -ENXIO; } err = pci_set_dma_mask(pdev, DMA_BIT_MASK(40)); if (!err) err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(40)); if (err) DRM_ERROR("Can't set DMA mask/consistent mask (%d)\n", err); pci_read_config_word(pdev, SNB_GMCH_CTRL, &snb_gmch_ctl); size = gen6_get_total_gtt_size(snb_gmch_ctl); ggtt->base.total = (size / sizeof(gen6_pte_t)) << PAGE_SHIFT; ggtt->base.clear_range = gen6_ggtt_clear_range; ggtt->base.insert_page = gen6_ggtt_insert_page; ggtt->base.insert_entries = gen6_ggtt_insert_entries; ggtt->base.bind_vma = ggtt_bind_vma; ggtt->base.unbind_vma = ggtt_unbind_vma; ggtt->base.set_pages = ggtt_set_pages; ggtt->base.clear_pages = clear_pages; ggtt->base.cleanup = gen6_gmch_remove; ggtt->invalidate = gen6_ggtt_invalidate; if (HAS_EDRAM(dev_priv)) ggtt->base.pte_encode = iris_pte_encode; else if (IS_HASWELL(dev_priv)) ggtt->base.pte_encode = hsw_pte_encode; else if (IS_VALLEYVIEW(dev_priv)) ggtt->base.pte_encode = byt_pte_encode; else if (INTEL_GEN(dev_priv) >= 7) ggtt->base.pte_encode = ivb_pte_encode; else ggtt->base.pte_encode = snb_pte_encode; return ggtt_probe_common(ggtt, size); } static void i915_gmch_remove(struct i915_address_space *vm) { intel_gmch_remove(); } static int i915_gmch_probe(struct i915_ggtt *ggtt) { struct drm_i915_private *dev_priv = ggtt->base.i915; phys_addr_t gmadr_base; int ret; ret = intel_gmch_probe(dev_priv->bridge_dev, dev_priv->drm.pdev, NULL); if (!ret) { DRM_ERROR("failed to set up gmch\n"); return -EIO; } intel_gtt_get(&ggtt->base.total, &gmadr_base, &ggtt->mappable_end); ggtt->gmadr = (struct resource) DEFINE_RES_MEM(gmadr_base, ggtt->mappable_end); ggtt->do_idle_maps = needs_idle_maps(dev_priv); ggtt->base.insert_page = i915_ggtt_insert_page; ggtt->base.insert_entries = i915_ggtt_insert_entries; ggtt->base.clear_range = i915_ggtt_clear_range; ggtt->base.bind_vma = ggtt_bind_vma; ggtt->base.unbind_vma = ggtt_unbind_vma; ggtt->base.set_pages = ggtt_set_pages; ggtt->base.clear_pages = clear_pages; ggtt->base.cleanup = i915_gmch_remove; ggtt->invalidate = gmch_ggtt_invalidate; if (unlikely(ggtt->do_idle_maps)) DRM_INFO("applying Ironlake quirks for intel_iommu\n"); return 0; } /** * i915_ggtt_probe_hw - Probe GGTT hardware location * @dev_priv: i915 device */ int i915_ggtt_probe_hw(struct drm_i915_private *dev_priv) { struct i915_ggtt *ggtt = &dev_priv->ggtt; int ret; ggtt->base.i915 = dev_priv; ggtt->base.dma = &dev_priv->drm.pdev->dev; if (INTEL_GEN(dev_priv) <= 5) ret = i915_gmch_probe(ggtt); else if (INTEL_GEN(dev_priv) < 8) ret = gen6_gmch_probe(ggtt); else ret = gen8_gmch_probe(ggtt); if (ret) return ret; /* Trim the GGTT to fit the GuC mappable upper range (when enabled). * This is easier than doing range restriction on the fly, as we * currently don't have any bits spare to pass in this upper * restriction! */ if (USES_GUC(dev_priv)) { ggtt->base.total = min_t(u64, ggtt->base.total, GUC_GGTT_TOP); ggtt->mappable_end = min_t(u64, ggtt->mappable_end, ggtt->base.total); } if ((ggtt->base.total - 1) >> 32) { DRM_ERROR("We never expected a Global GTT with more than 32bits" " of address space! Found %lldM!\n", ggtt->base.total >> 20); ggtt->base.total = 1ULL << 32; ggtt->mappable_end = min_t(u64, ggtt->mappable_end, ggtt->base.total); } if (ggtt->mappable_end > ggtt->base.total) { DRM_ERROR("mappable aperture extends past end of GGTT," " aperture=%pa, total=%llx\n", &ggtt->mappable_end, ggtt->base.total); ggtt->mappable_end = ggtt->base.total; } /* GMADR is the PCI mmio aperture into the global GTT. */ DRM_DEBUG_DRIVER("GGTT size = %lluM\n", ggtt->base.total >> 20); DRM_DEBUG_DRIVER("GMADR size = %lluM\n", (u64)ggtt->mappable_end >> 20); DRM_DEBUG_DRIVER("DSM size = %lluM\n", (u64)resource_size(&intel_graphics_stolen_res) >> 20); if (intel_vtd_active()) DRM_INFO("VT-d active for gfx access\n"); return 0; } /** * i915_ggtt_init_hw - Initialize GGTT hardware * @dev_priv: i915 device */ int i915_ggtt_init_hw(struct drm_i915_private *dev_priv) { struct i915_ggtt *ggtt = &dev_priv->ggtt; int ret; INIT_LIST_HEAD(&dev_priv->vm_list); /* Note that we use page colouring to enforce a guard page at the * end of the address space. This is required as the CS may prefetch * beyond the end of the batch buffer, across the page boundary, * and beyond the end of the GTT if we do not provide a guard. */ mutex_lock(&dev_priv->drm.struct_mutex); i915_address_space_init(&ggtt->base, dev_priv, "[global]"); if (!HAS_LLC(dev_priv) && !USES_PPGTT(dev_priv)) ggtt->base.mm.color_adjust = i915_gtt_color_adjust; mutex_unlock(&dev_priv->drm.struct_mutex); if (!io_mapping_init_wc(&dev_priv->ggtt.iomap, dev_priv->ggtt.gmadr.start, dev_priv->ggtt.mappable_end)) { ret = -EIO; goto out_gtt_cleanup; } ggtt->mtrr = arch_phys_wc_add(ggtt->gmadr.start, ggtt->mappable_end); /* * Initialise stolen early so that we may reserve preallocated * objects for the BIOS to KMS transition. */ ret = i915_gem_init_stolen(dev_priv); if (ret) goto out_gtt_cleanup; return 0; out_gtt_cleanup: ggtt->base.cleanup(&ggtt->base); return ret; } int i915_ggtt_enable_hw(struct drm_i915_private *dev_priv) { if (INTEL_GEN(dev_priv) < 6 && !intel_enable_gtt()) return -EIO; return 0; } void i915_ggtt_enable_guc(struct drm_i915_private *i915) { GEM_BUG_ON(i915->ggtt.invalidate != gen6_ggtt_invalidate); i915->ggtt.invalidate = guc_ggtt_invalidate; i915_ggtt_invalidate(i915); } void i915_ggtt_disable_guc(struct drm_i915_private *i915) { /* We should only be called after i915_ggtt_enable_guc() */ GEM_BUG_ON(i915->ggtt.invalidate != guc_ggtt_invalidate); i915->ggtt.invalidate = gen6_ggtt_invalidate; i915_ggtt_invalidate(i915); } void i915_gem_restore_gtt_mappings(struct drm_i915_private *dev_priv) { struct i915_ggtt *ggtt = &dev_priv->ggtt; struct drm_i915_gem_object *obj, *on; i915_check_and_clear_faults(dev_priv); /* First fill our portion of the GTT with scratch pages */ ggtt->base.clear_range(&ggtt->base, 0, ggtt->base.total); ggtt->base.closed = true; /* skip rewriting PTE on VMA unbind */ /* clflush objects bound into the GGTT and rebind them. */ list_for_each_entry_safe(obj, on, &dev_priv->mm.bound_list, mm.link) { bool ggtt_bound = false; struct i915_vma *vma; for_each_ggtt_vma(vma, obj) { if (!i915_vma_unbind(vma)) continue; WARN_ON(i915_vma_bind(vma, obj->cache_level, PIN_UPDATE)); ggtt_bound = true; } if (ggtt_bound) WARN_ON(i915_gem_object_set_to_gtt_domain(obj, false)); } ggtt->base.closed = false; if (INTEL_GEN(dev_priv) >= 8) { struct intel_ppat *ppat = &dev_priv->ppat; bitmap_set(ppat->dirty, 0, ppat->max_entries); dev_priv->ppat.update_hw(dev_priv); return; } if (USES_PPGTT(dev_priv)) { struct i915_address_space *vm; list_for_each_entry(vm, &dev_priv->vm_list, global_link) { struct i915_hw_ppgtt *ppgtt; if (i915_is_ggtt(vm)) ppgtt = dev_priv->mm.aliasing_ppgtt; else ppgtt = i915_vm_to_ppgtt(vm); gen6_write_page_range(ppgtt, 0, ppgtt->base.total); } } i915_ggtt_invalidate(dev_priv); } static struct scatterlist * rotate_pages(const dma_addr_t *in, unsigned int offset, unsigned int width, unsigned int height, unsigned int stride, struct sg_table *st, struct scatterlist *sg) { unsigned int column, row; unsigned int src_idx; for (column = 0; column < width; column++) { src_idx = stride * (height - 1) + column; for (row = 0; row < height; row++) { st->nents++; /* We don't need the pages, but need to initialize * the entries so the sg list can be happily traversed. * The only thing we need are DMA addresses. */ sg_set_page(sg, NULL, PAGE_SIZE, 0); sg_dma_address(sg) = in[offset + src_idx]; sg_dma_len(sg) = PAGE_SIZE; sg = sg_next(sg); src_idx -= stride; } } return sg; } static noinline struct sg_table * intel_rotate_pages(struct intel_rotation_info *rot_info, struct drm_i915_gem_object *obj) { const unsigned long n_pages = obj->base.size / PAGE_SIZE; unsigned int size = intel_rotation_info_size(rot_info); struct sgt_iter sgt_iter; dma_addr_t dma_addr; unsigned long i; dma_addr_t *page_addr_list; struct sg_table *st; struct scatterlist *sg; int ret = -ENOMEM; /* Allocate a temporary list of source pages for random access. */ page_addr_list = kvmalloc_array(n_pages, sizeof(dma_addr_t), GFP_KERNEL); if (!page_addr_list) return ERR_PTR(ret); /* Allocate target SG list. */ st = kmalloc(sizeof(*st), GFP_KERNEL); if (!st) goto err_st_alloc; ret = sg_alloc_table(st, size, GFP_KERNEL); if (ret) goto err_sg_alloc; /* Populate source page list from the object. */ i = 0; for_each_sgt_dma(dma_addr, sgt_iter, obj->mm.pages) page_addr_list[i++] = dma_addr; GEM_BUG_ON(i != n_pages); st->nents = 0; sg = st->sgl; for (i = 0 ; i < ARRAY_SIZE(rot_info->plane); i++) { sg = rotate_pages(page_addr_list, rot_info->plane[i].offset, rot_info->plane[i].width, rot_info->plane[i].height, rot_info->plane[i].stride, st, sg); } kvfree(page_addr_list); return st; err_sg_alloc: kfree(st); err_st_alloc: kvfree(page_addr_list); DRM_DEBUG_DRIVER("Failed to create rotated mapping for object size %zu! (%ux%u tiles, %u pages)\n", obj->base.size, rot_info->plane[0].width, rot_info->plane[0].height, size); return ERR_PTR(ret); } static noinline struct sg_table * intel_partial_pages(const struct i915_ggtt_view *view, struct drm_i915_gem_object *obj) { struct sg_table *st; struct scatterlist *sg, *iter; unsigned int count = view->partial.size; unsigned int offset; int ret = -ENOMEM; st = kmalloc(sizeof(*st), GFP_KERNEL); if (!st) goto err_st_alloc; ret = sg_alloc_table(st, count, GFP_KERNEL); if (ret) goto err_sg_alloc; iter = i915_gem_object_get_sg(obj, view->partial.offset, &offset); GEM_BUG_ON(!iter); sg = st->sgl; st->nents = 0; do { unsigned int len; len = min(iter->length - (offset << PAGE_SHIFT), count << PAGE_SHIFT); sg_set_page(sg, NULL, len, 0); sg_dma_address(sg) = sg_dma_address(iter) + (offset << PAGE_SHIFT); sg_dma_len(sg) = len; st->nents++; count -= len >> PAGE_SHIFT; if (count == 0) { sg_mark_end(sg); return st; } sg = __sg_next(sg); iter = __sg_next(iter); offset = 0; } while (1); err_sg_alloc: kfree(st); err_st_alloc: return ERR_PTR(ret); } static int i915_get_ggtt_vma_pages(struct i915_vma *vma) { int ret; /* The vma->pages are only valid within the lifespan of the borrowed * obj->mm.pages. When the obj->mm.pages sg_table is regenerated, so * must be the vma->pages. A simple rule is that vma->pages must only * be accessed when the obj->mm.pages are pinned. */ GEM_BUG_ON(!i915_gem_object_has_pinned_pages(vma->obj)); switch (vma->ggtt_view.type) { case I915_GGTT_VIEW_NORMAL: vma->pages = vma->obj->mm.pages; return 0; case I915_GGTT_VIEW_ROTATED: vma->pages = intel_rotate_pages(&vma->ggtt_view.rotated, vma->obj); break; case I915_GGTT_VIEW_PARTIAL: vma->pages = intel_partial_pages(&vma->ggtt_view, vma->obj); break; default: WARN_ONCE(1, "GGTT view %u not implemented!\n", vma->ggtt_view.type); return -EINVAL; } ret = 0; if (unlikely(IS_ERR(vma->pages))) { ret = PTR_ERR(vma->pages); vma->pages = NULL; DRM_ERROR("Failed to get pages for VMA view type %u (%d)!\n", vma->ggtt_view.type, ret); } return ret; } /** * i915_gem_gtt_reserve - reserve a node in an address_space (GTT) * @vm: the &struct i915_address_space * @node: the &struct drm_mm_node (typically i915_vma.mode) * @size: how much space to allocate inside the GTT, * must be #I915_GTT_PAGE_SIZE aligned * @offset: where to insert inside the GTT, * must be #I915_GTT_MIN_ALIGNMENT aligned, and the node * (@offset + @size) must fit within the address space * @color: color to apply to node, if this node is not from a VMA, * color must be #I915_COLOR_UNEVICTABLE * @flags: control search and eviction behaviour * * i915_gem_gtt_reserve() tries to insert the @node at the exact @offset inside * the address space (using @size and @color). If the @node does not fit, it * tries to evict any overlapping nodes from the GTT, including any * neighbouring nodes if the colors do not match (to ensure guard pages between * differing domains). See i915_gem_evict_for_node() for the gory details * on the eviction algorithm. #PIN_NONBLOCK may used to prevent waiting on * evicting active overlapping objects, and any overlapping node that is pinned * or marked as unevictable will also result in failure. * * Returns: 0 on success, -ENOSPC if no suitable hole is found, -EINTR if * asked to wait for eviction and interrupted. */ int i915_gem_gtt_reserve(struct i915_address_space *vm, struct drm_mm_node *node, u64 size, u64 offset, unsigned long color, unsigned int flags) { int err; GEM_BUG_ON(!size); GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)); GEM_BUG_ON(!IS_ALIGNED(offset, I915_GTT_MIN_ALIGNMENT)); GEM_BUG_ON(range_overflows(offset, size, vm->total)); GEM_BUG_ON(vm == &vm->i915->mm.aliasing_ppgtt->base); GEM_BUG_ON(drm_mm_node_allocated(node)); node->size = size; node->start = offset; node->color = color; err = drm_mm_reserve_node(&vm->mm, node); if (err != -ENOSPC) return err; if (flags & PIN_NOEVICT) return -ENOSPC; err = i915_gem_evict_for_node(vm, node, flags); if (err == 0) err = drm_mm_reserve_node(&vm->mm, node); return err; } static u64 random_offset(u64 start, u64 end, u64 len, u64 align) { u64 range, addr; GEM_BUG_ON(range_overflows(start, len, end)); GEM_BUG_ON(round_up(start, align) > round_down(end - len, align)); range = round_down(end - len, align) - round_up(start, align); if (range) { if (sizeof(unsigned long) == sizeof(u64)) { addr = get_random_long(); } else { addr = get_random_int(); if (range > U32_MAX) { addr <<= 32; addr |= get_random_int(); } } div64_u64_rem(addr, range, &addr); start += addr; } return round_up(start, align); } /** * i915_gem_gtt_insert - insert a node into an address_space (GTT) * @vm: the &struct i915_address_space * @node: the &struct drm_mm_node (typically i915_vma.node) * @size: how much space to allocate inside the GTT, * must be #I915_GTT_PAGE_SIZE aligned * @alignment: required alignment of starting offset, may be 0 but * if specified, this must be a power-of-two and at least * #I915_GTT_MIN_ALIGNMENT * @color: color to apply to node * @start: start of any range restriction inside GTT (0 for all), * must be #I915_GTT_PAGE_SIZE aligned * @end: end of any range restriction inside GTT (U64_MAX for all), * must be #I915_GTT_PAGE_SIZE aligned if not U64_MAX * @flags: control search and eviction behaviour * * i915_gem_gtt_insert() first searches for an available hole into which * is can insert the node. The hole address is aligned to @alignment and * its @size must then fit entirely within the [@start, @end] bounds. The * nodes on either side of the hole must match @color, or else a guard page * will be inserted between the two nodes (or the node evicted). If no * suitable hole is found, first a victim is randomly selected and tested * for eviction, otherwise then the LRU list of objects within the GTT * is scanned to find the first set of replacement nodes to create the hole. * Those old overlapping nodes are evicted from the GTT (and so must be * rebound before any future use). Any node that is currently pinned cannot * be evicted (see i915_vma_pin()). Similar if the node's VMA is currently * active and #PIN_NONBLOCK is specified, that node is also skipped when * searching for an eviction candidate. See i915_gem_evict_something() for * the gory details on the eviction algorithm. * * Returns: 0 on success, -ENOSPC if no suitable hole is found, -EINTR if * asked to wait for eviction and interrupted. */ int i915_gem_gtt_insert(struct i915_address_space *vm, struct drm_mm_node *node, u64 size, u64 alignment, unsigned long color, u64 start, u64 end, unsigned int flags) { enum drm_mm_insert_mode mode; u64 offset; int err; lockdep_assert_held(&vm->i915->drm.struct_mutex); GEM_BUG_ON(!size); GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)); GEM_BUG_ON(alignment && !is_power_of_2(alignment)); GEM_BUG_ON(alignment && !IS_ALIGNED(alignment, I915_GTT_MIN_ALIGNMENT)); GEM_BUG_ON(start >= end); GEM_BUG_ON(start > 0 && !IS_ALIGNED(start, I915_GTT_PAGE_SIZE)); GEM_BUG_ON(end < U64_MAX && !IS_ALIGNED(end, I915_GTT_PAGE_SIZE)); GEM_BUG_ON(vm == &vm->i915->mm.aliasing_ppgtt->base); GEM_BUG_ON(drm_mm_node_allocated(node)); if (unlikely(range_overflows(start, size, end))) return -ENOSPC; if (unlikely(round_up(start, alignment) > round_down(end - size, alignment))) return -ENOSPC; mode = DRM_MM_INSERT_BEST; if (flags & PIN_HIGH) mode = DRM_MM_INSERT_HIGH; if (flags & PIN_MAPPABLE) mode = DRM_MM_INSERT_LOW; /* We only allocate in PAGE_SIZE/GTT_PAGE_SIZE (4096) chunks, * so we know that we always have a minimum alignment of 4096. * The drm_mm range manager is optimised to return results * with zero alignment, so where possible use the optimal * path. */ BUILD_BUG_ON(I915_GTT_MIN_ALIGNMENT > I915_GTT_PAGE_SIZE); if (alignment <= I915_GTT_MIN_ALIGNMENT) alignment = 0; err = drm_mm_insert_node_in_range(&vm->mm, node, size, alignment, color, start, end, mode); if (err != -ENOSPC) return err; if (flags & PIN_NOEVICT) return -ENOSPC; /* No free space, pick a slot at random. * * There is a pathological case here using a GTT shared between * mmap and GPU (i.e. ggtt/aliasing_ppgtt but not full-ppgtt): * * |<-- 256 MiB aperture -->||<-- 1792 MiB unmappable -->| * (64k objects) (448k objects) * * Now imagine that the eviction LRU is ordered top-down (just because * pathology meets real life), and that we need to evict an object to * make room inside the aperture. The eviction scan then has to walk * the 448k list before it finds one within range. And now imagine that * it has to search for a new hole between every byte inside the memcpy, * for several simultaneous clients. * * On a full-ppgtt system, if we have run out of available space, there * will be lots and lots of objects in the eviction list! Again, * searching that LRU list may be slow if we are also applying any * range restrictions (e.g. restriction to low 4GiB) and so, for * simplicity and similarilty between different GTT, try the single * random replacement first. */ offset = random_offset(start, end, size, alignment ?: I915_GTT_MIN_ALIGNMENT); err = i915_gem_gtt_reserve(vm, node, size, offset, color, flags); if (err != -ENOSPC) return err; /* Randomly selected placement is pinned, do a search */ err = i915_gem_evict_something(vm, size, alignment, color, start, end, flags); if (err) return err; return drm_mm_insert_node_in_range(&vm->mm, node, size, alignment, color, start, end, DRM_MM_INSERT_EVICT); } #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) #include "selftests/mock_gtt.c" #include "selftests/i915_gem_gtt.c" #endif