From patchwork Tue Jan 13 11:52:24 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michel Thierry X-Patchwork-Id: 5619621 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id D7D689F3A0 for ; Tue, 13 Jan 2015 11:52:32 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 673C320551 for ; Tue, 13 Jan 2015 11:52:31 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id E485D204FB for ; Tue, 13 Jan 2015 11:52:27 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6E0716E5CD; Tue, 13 Jan 2015 03:52:27 -0800 (PST) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTP id 62EF96E5CD for ; Tue, 13 Jan 2015 03:52:25 -0800 (PST) Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga101.jf.intel.com with ESMTP; 13 Jan 2015 03:52:24 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,749,1413270000"; d="scan'208";a="661059968" Received: from michelth-linux.isw.intel.com ([10.102.226.150]) by fmsmga002.fm.intel.com with ESMTP; 13 Jan 2015 03:52:23 -0800 From: Michel Thierry To: intel-gfx@lists.freedesktop.org Date: Tue, 13 Jan 2015 11:52:24 +0000 Message-Id: <1421149959-30383-11-git-send-email-michel.thierry@intel.com> X-Mailer: git-send-email 2.1.1 In-Reply-To: <1421149959-30383-1-git-send-email-michel.thierry@intel.com> References: <1418922621-25818-1-git-send-email-michel.thierry@intel.com> <1421149959-30383-1-git-send-email-michel.thierry@intel.com> Subject: [Intel-gfx] [PATCH v3 10/25] drm/i915: Track GEN6 page table usage X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Ben Widawsky Instead of implementing the full tracking + dynamic allocation, this patch does a bit less than half of the work, by tracking and warning on unexpected conditions. The tracking itself follows which PTEs within a page table are currently being used for objects. The next patch will modify this to actually allocate the page tables only when necessary. With the current patch there isn't much in the way of making a gen agnostic range allocation function. However, in the next patch we'll add more specificity which makes having separate functions a bit easier to manage. One important change introduced here is that DMA mappings are created/destroyed at the same page directories/tables are allocated/deallocated. Notice that aliasing PPGTT is not managed here. The patch which actually begins dynamic allocation/teardown explains the reasoning for this. v2: s/pdp.page_directory/pdp.page_directorys Make a scratch page allocation helper v3: Rebase and expand commit message. v4: Allocate required pagetables only when it is needed, _bind_to_vm instead of bind_vma (Daniel). v5: Rebased to remove the unnecessary noise in the diff, also: - PDE mask is GEN agnostic, renamed GEN6_PDE_MASK to I915_PDE_MASK. - Removed unnecessary checks in gen6_alloc_va_range. - Changed map/unmap_px_single macros to use dma functions directly and be part of a static inline function instead. - Moved drm_device plumbing through page tables operation to its own patch. - Moved allocate/teardown_va_range calls until they are fully implemented (in subsequent patch). - Merged pt and scratch_pt unmap_and_free path. - Moved scratch page allocator helper to the patch that will use it. Cc: Daniel Vetter Signed-off-by: Ben Widawsky Signed-off-by: Michel Thierry (v3+) --- drivers/gpu/drm/i915/i915_gem_gtt.c | 206 +++++++++++++++++++++++++----------- drivers/gpu/drm/i915/i915_gem_gtt.h | 77 ++++++++++++++ 2 files changed, 223 insertions(+), 60 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index c3c1828..95934a7 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -274,29 +274,89 @@ static gen6_gtt_pte_t iris_pte_encode(dma_addr_t addr, return pte; } -static void unmap_and_free_pt(struct i915_page_table_entry *pt, struct drm_device *dev) +#define i915_dma_unmap_single(px, dev) do { \ + __i915_dma_unmap_single((px)->daddr, dev); \ +} while (0) + +static inline void __i915_dma_unmap_single(dma_addr_t daddr, + struct drm_device *dev) +{ + struct device *device = &dev->pdev->dev; + + dma_unmap_page(device, daddr, 4096, PCI_DMA_BIDIRECTIONAL); +} + +/** + * i915_dma_map_px_single() - Create a dma mapping for a page table/dir/etc. + * @px: Page table/dir/etc to get a DMA map for + * @dev: drm device + * + * Page table allocations are unified across all gens. They always require a + * single 4k allocation, as well as a DMA mapping. If we keep the structs + * symmetric here, the simple macro covers us for every page table type. + * + * Return: 0 if success. + */ +#define i915_dma_map_px_single(px, dev) \ + i915_dma_map_page_single((px)->page, (dev), &(px)->daddr) + +static inline int i915_dma_map_page_single(struct page *page, + struct drm_device *dev, + dma_addr_t *daddr) +{ + struct device *device = &dev->pdev->dev; + + *daddr = dma_map_page(device, page, 0, 4096, PCI_DMA_BIDIRECTIONAL); + return dma_mapping_error(device, *daddr); +} + +static void unmap_and_free_pt(struct i915_page_table_entry *pt, + struct drm_device *dev) { if (WARN_ON(!pt->page)) return; + + i915_dma_unmap_single(pt, dev); __free_page(pt->page); + kfree(pt->used_ptes); kfree(pt); } static struct i915_page_table_entry *alloc_pt_single(struct drm_device *dev) { struct i915_page_table_entry *pt; + const size_t count = INTEL_INFO(dev)->gen >= 8 ? + GEN8_PTES_PER_PAGE : I915_PPGTT_PT_ENTRIES; + int ret = -ENOMEM; pt = kzalloc(sizeof(*pt), GFP_KERNEL); if (!pt) return ERR_PTR(-ENOMEM); + pt->used_ptes = kcalloc(BITS_TO_LONGS(count), sizeof(*pt->used_ptes), + GFP_KERNEL); + + if (!pt->used_ptes) + goto fail_bitmap; + pt->page = alloc_page(GFP_KERNEL | __GFP_ZERO); - if (!pt->page) { - kfree(pt); - return ERR_PTR(-ENOMEM); - } + if (!pt->page) + goto fail_page; + + ret = i915_dma_map_px_single(pt, dev); + if (ret) + goto fail_dma; return pt; + +fail_dma: + __free_page(pt->page); +fail_page: + kfree(pt->used_ptes); +fail_bitmap: + kfree(pt); + + return ERR_PTR(ret); } /** @@ -805,26 +865,36 @@ static void gen6_dump_ppgtt(struct i915_hw_ppgtt *ppgtt, struct seq_file *m) } } -static void gen6_write_pdes(struct i915_hw_ppgtt *ppgtt) +/* Write pde (index) from the page directory @pd to the page table @pt */ +static void gen6_write_pdes(struct i915_page_directory_entry *pd, + const int pde, struct i915_page_table_entry *pt) { - struct drm_i915_private *dev_priv = ppgtt->base.dev->dev_private; - gen6_gtt_pte_t __iomem *pd_addr; - uint32_t pd_entry; - int i; + struct i915_hw_ppgtt *ppgtt = + container_of(pd, struct i915_hw_ppgtt, pd); + u32 pd_entry; - WARN_ON(ppgtt->pd.pd_offset & 0x3f); - pd_addr = (gen6_gtt_pte_t __iomem*)dev_priv->gtt.gsm + - ppgtt->pd.pd_offset / sizeof(gen6_gtt_pte_t); - for (i = 0; i < ppgtt->num_pd_entries; i++) { - dma_addr_t pt_addr; + pd_entry = GEN6_PDE_ADDR_ENCODE(pt->daddr); + pd_entry |= GEN6_PDE_VALID; - pt_addr = ppgtt->pd.page_tables[i]->daddr; - pd_entry = GEN6_PDE_ADDR_ENCODE(pt_addr); - pd_entry |= GEN6_PDE_VALID; + writel(pd_entry, ppgtt->pd_addr + pde); - writel(pd_entry, pd_addr + i); - } - readl(pd_addr); + /* XXX: Caller needs to make sure the write completes if necessary */ +} + +/* Write all the page tables found in the ppgtt structure to incrementing page + * directories. */ +static void gen6_write_page_range(struct drm_i915_private *dev_priv, + struct i915_page_directory_entry *pd, uint32_t start, uint32_t length) +{ + struct i915_page_table_entry *pt; + uint32_t pde, temp; + + gen6_for_each_pde(pt, pd, start, length, temp, pde) + gen6_write_pdes(pd, pde, pt); + + /* Make sure write is complete before other code can use this page + * table. Also require for WC mapped PTEs */ + readl(dev_priv->gtt.gsm); } static uint32_t get_pd_offset(struct i915_hw_ppgtt *ppgtt) @@ -1040,6 +1110,41 @@ static void gen6_ppgtt_unmap_pages(struct i915_hw_ppgtt *ppgtt) 4096, PCI_DMA_BIDIRECTIONAL); } +static int gen6_alloc_va_range(struct i915_address_space *vm, + uint64_t start, uint64_t length) +{ + struct i915_hw_ppgtt *ppgtt = + container_of(vm, struct i915_hw_ppgtt, base); + struct i915_page_table_entry *pt; + uint32_t pde, temp; + + gen6_for_each_pde(pt, &ppgtt->pd, start, length, temp, pde) { + DECLARE_BITMAP(tmp_bitmap, I915_PPGTT_PT_ENTRIES); + bitmap_zero(tmp_bitmap, I915_PPGTT_PT_ENTRIES); + bitmap_set(tmp_bitmap, gen6_pte_index(start), + gen6_pte_count(start, length)); + + bitmap_or(pt->used_ptes, pt->used_ptes, tmp_bitmap, + I915_PPGTT_PT_ENTRIES); + } + + return 0; +} + +static void gen6_teardown_va_range(struct i915_address_space *vm, + uint64_t start, uint64_t length) +{ + struct i915_hw_ppgtt *ppgtt = + container_of(vm, struct i915_hw_ppgtt, base); + struct i915_page_table_entry *pt; + uint32_t pde, temp; + + gen6_for_each_pde(pt, &ppgtt->pd, start, length, temp, pde) { + bitmap_clear(pt->used_ptes, gen6_pte_index(start), + gen6_pte_count(start, length)); + } +} + static void gen6_ppgtt_free(struct i915_hw_ppgtt *ppgtt) { int i; @@ -1086,20 +1191,24 @@ alloc: 0, dev_priv->gtt.base.total, 0); if (ret) - return ret; + goto err_out; retried = true; goto alloc; } if (ret) - return ret; + goto err_out; + if (ppgtt->node.start < dev_priv->gtt.mappable_end) DRM_DEBUG("Forced to use aperture for PDEs\n"); ppgtt->num_pd_entries = GEN6_PPGTT_PD_ENTRIES; return 0; + +err_out: + return ret; } static int gen6_ppgtt_alloc(struct i915_hw_ppgtt *ppgtt) @@ -1121,30 +1230,6 @@ static int gen6_ppgtt_alloc(struct i915_hw_ppgtt *ppgtt) return 0; } -static int gen6_ppgtt_setup_page_tables(struct i915_hw_ppgtt *ppgtt) -{ - struct drm_device *dev = ppgtt->base.dev; - int i; - - for (i = 0; i < ppgtt->num_pd_entries; i++) { - struct page *page; - dma_addr_t pt_addr; - - page = ppgtt->pd.page_tables[i]->page; - pt_addr = pci_map_page(dev->pdev, page, 0, 4096, - PCI_DMA_BIDIRECTIONAL); - - if (pci_dma_mapping_error(dev->pdev, pt_addr)) { - gen6_ppgtt_unmap_pages(ppgtt); - return -EIO; - } - - ppgtt->pd.page_tables[i]->daddr = pt_addr; - } - - return 0; -} - static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt) { struct drm_device *dev = ppgtt->base.dev; @@ -1165,12 +1250,8 @@ static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt) if (ret) return ret; - ret = gen6_ppgtt_setup_page_tables(ppgtt); - if (ret) { - gen6_ppgtt_free(ppgtt); - return ret; - } - + ppgtt->base.allocate_va_range = gen6_alloc_va_range; + ppgtt->base.teardown_va_range = gen6_teardown_va_range; ppgtt->base.clear_range = gen6_ppgtt_clear_range; ppgtt->base.insert_entries = gen6_ppgtt_insert_entries; ppgtt->base.cleanup = gen6_ppgtt_cleanup; @@ -1181,11 +1262,15 @@ static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt) ppgtt->pd.pd_offset = ppgtt->node.start / PAGE_SIZE * sizeof(gen6_gtt_pte_t); + ppgtt->pd_addr = (gen6_gtt_pte_t __iomem *)dev_priv->gtt.gsm + + ppgtt->pd.pd_offset / sizeof(gen6_gtt_pte_t); + + gen6_write_page_range(dev_priv, &ppgtt->pd, 0, ppgtt->base.total); + DRM_DEBUG_DRIVER("Allocated pde space (%ldM) at GTT entry: %lx\n", ppgtt->node.size >> 20, ppgtt->node.start / PAGE_SIZE); - gen6_write_pdes(ppgtt); DRM_DEBUG("Adding PPGTT at offset %x\n", ppgtt->pd.pd_offset << 10); @@ -1460,13 +1545,14 @@ void i915_gem_restore_gtt_mappings(struct drm_device *dev) list_for_each_entry(vm, &dev_priv->vm_list, global_link) { /* TODO: Perhaps it shouldn't be gen6 specific */ - if (i915_is_ggtt(vm)) { - if (dev_priv->mm.aliasing_ppgtt) - gen6_write_pdes(dev_priv->mm.aliasing_ppgtt); - continue; - } - gen6_write_pdes(container_of(vm, struct i915_hw_ppgtt, base)); + struct i915_hw_ppgtt *ppgtt = + container_of(vm, struct i915_hw_ppgtt, base); + + if (i915_is_ggtt(vm)) + ppgtt = dev_priv->mm.aliasing_ppgtt; + + gen6_write_page_range(dev_priv, &ppgtt->pd, 0, ppgtt->num_pd_entries); } i915_ggtt_flush(dev_priv); diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h index e8cad72..caa1aa9 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.h +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h @@ -54,7 +54,10 @@ typedef gen8_gtt_pte_t gen8_ppgtt_pde_t; #define GEN6_PPGTT_PD_ENTRIES 512 #define GEN6_PD_SIZE (GEN6_PPGTT_PD_ENTRIES * PAGE_SIZE) #define GEN6_PD_ALIGN (PAGE_SIZE * 16) +#define GEN6_PDE_SHIFT 22 #define GEN6_PDE_VALID (1 << 0) +#define I915_PDE_MASK (GEN6_PPGTT_PD_ENTRIES-1) +#define NUM_PTE(pde_shift) (1 << (pde_shift - PAGE_SHIFT)) #define GEN7_PTE_CACHE_L3_LLC (3 << 1) @@ -190,6 +193,8 @@ struct i915_vma { struct i915_page_table_entry { struct page *page; dma_addr_t daddr; + + unsigned long *used_ptes; }; struct i915_page_directory_entry { @@ -246,6 +251,12 @@ struct i915_address_space { gen6_gtt_pte_t (*pte_encode)(dma_addr_t addr, enum i915_cache_level level, bool valid, u32 flags); /* Create a valid PTE */ + int (*allocate_va_range)(struct i915_address_space *vm, + uint64_t start, + uint64_t length); + void (*teardown_va_range)(struct i915_address_space *vm, + uint64_t start, + uint64_t length); void (*clear_range)(struct i915_address_space *vm, uint64_t start, uint64_t length, @@ -298,12 +309,78 @@ struct i915_hw_ppgtt { struct drm_i915_file_private *file_priv; + gen6_gtt_pte_t __iomem *pd_addr; + int (*enable)(struct i915_hw_ppgtt *ppgtt); int (*switch_mm)(struct i915_hw_ppgtt *ppgtt, struct intel_engine_cs *ring); void (*debug_dump)(struct i915_hw_ppgtt *ppgtt, struct seq_file *m); }; +/* For each pde iterates over every pde between from start until start + length. + * If start, and start+length are not perfectly divisible, the macro will round + * down, and up as needed. The macro modifies pde, start, and length. Dev is + * only used to differentiate shift values. Temp is temp. On gen6/7, start = 0, + * and length = 2G effectively iterates over every PDE in the system. On gen8+ + * it simply iterates over every page directory entry in a page directory. + * + * XXX: temp is not actually needed, but it saves doing the ALIGN operation. + */ +#define gen6_for_each_pde(pt, pd, start, length, temp, iter) \ + for (iter = gen6_pde_index(start), pt = (pd)->page_tables[iter]; \ + length > 0 && iter < GEN6_PPGTT_PD_ENTRIES; \ + pt = (pd)->page_tables[++iter], \ + temp = ALIGN(start+1, 1 << GEN6_PDE_SHIFT) - start, \ + temp = min(temp, (unsigned)length), \ + start += temp, length -= temp) + +static inline uint32_t i915_pte_index(uint64_t address, uint32_t pde_shift) +{ + const uint32_t mask = NUM_PTE(pde_shift) - 1; + return (address >> PAGE_SHIFT) & mask; +} + +/* Helper to counts the number of PTEs within the given length. This count does +* not cross a page table boundary, so the max value would be +* I915_PPGTT_PT_ENTRIES for GEN6, and GEN8_PTES_PER_PAGE for GEN8. +*/ +static inline size_t i915_pte_count(uint64_t addr, size_t length, + uint32_t pde_shift) +{ + const uint64_t mask = ~((1 << pde_shift) - 1); + uint64_t end; + + BUG_ON(length == 0); + BUG_ON(offset_in_page(addr|length)); + + end = addr + length; + + if ((addr & mask) != (end & mask)) + return NUM_PTE(pde_shift) - i915_pte_index(addr, pde_shift); + + return i915_pte_index(end, pde_shift) - i915_pte_index(addr, pde_shift); +} + +static inline uint32_t i915_pde_index(uint64_t addr, uint32_t shift) +{ + return (addr >> shift) & I915_PDE_MASK; +} + +static inline uint32_t gen6_pte_index(uint32_t addr) +{ + return i915_pte_index(addr, GEN6_PDE_SHIFT); +} + +static inline size_t gen6_pte_count(uint32_t addr, uint32_t length) +{ + return i915_pte_count(addr, length, GEN6_PDE_SHIFT); +} + +static inline uint32_t gen6_pde_index(uint32_t addr) +{ + return i915_pde_index(addr, GEN6_PDE_SHIFT); +} + int i915_gem_gtt_init(struct drm_device *dev); void i915_gem_init_global_gtt(struct drm_device *dev); void i915_global_gtt_cleanup(struct drm_device *dev);