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1/*2 * SPDX-License-Identifier: MIT3 *4 * Copyright © 2014-2016 Intel Corporation5 */6 7#include <linux/highmem.h>8#include <linux/shmem_fs.h>9#include <linux/swap.h>10 11#include <drm/drm_cache.h>12 13#include "gt/intel_gt.h"14#include "i915_drv.h"15#include "i915_gem_object.h"16#include "i915_gem_object_frontbuffer.h"17#include "i915_gem_region.h"18#include "i915_gem_tiling.h"19#include "i915_scatterlist.h"20 21static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)22{23 struct address_space *mapping = obj->base.filp->f_mapping;24 struct drm_i915_private *i915 = to_i915(obj->base.dev);25 struct scatterlist *sg;26 struct sg_table *st;27 dma_addr_t dma;28 void *vaddr;29 void *dst;30 int i;31 32 /* Contiguous chunk, with a single scatterlist element */33 if (overflows_type(obj->base.size, sg->length))34 return -E2BIG;35 36 if (GEM_WARN_ON(i915_gem_object_needs_bit17_swizzle(obj)))37 return -EINVAL;38 39 /*40 * Always aligning to the object size, allows a single allocation41 * to handle all possible callers, and given typical object sizes,42 * the alignment of the buddy allocation will naturally match.43 */44 vaddr = dma_alloc_coherent(obj->base.dev->dev,45 roundup_pow_of_two(obj->base.size),46 &dma, GFP_KERNEL);47 if (!vaddr)48 return -ENOMEM;49 50 st = kmalloc(sizeof(*st), GFP_KERNEL);51 if (!st)52 goto err_pci;53 54 if (sg_alloc_table(st, 1, GFP_KERNEL))55 goto err_st;56 57 sg = st->sgl;58 sg->offset = 0;59 sg->length = obj->base.size;60 61 sg_assign_page(sg, (struct page *)vaddr);62 sg_dma_address(sg) = dma;63 sg_dma_len(sg) = obj->base.size;64 65 dst = vaddr;66 for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {67 struct page *page;68 69 page = shmem_read_mapping_page(mapping, i);70 if (IS_ERR(page))71 goto err_st;72 73 memcpy_from_page(dst, page, 0, PAGE_SIZE);74 drm_clflush_virt_range(dst, PAGE_SIZE);75 76 put_page(page);77 dst += PAGE_SIZE;78 }79 80 intel_gt_chipset_flush(to_gt(i915));81 82 /* We're no longer struct page backed */83 obj->mem_flags &= ~I915_BO_FLAG_STRUCT_PAGE;84 __i915_gem_object_set_pages(obj, st);85 86 return 0;87 88err_st:89 kfree(st);90err_pci:91 dma_free_coherent(obj->base.dev->dev,92 roundup_pow_of_two(obj->base.size),93 vaddr, dma);94 return -ENOMEM;95}96 97void98i915_gem_object_put_pages_phys(struct drm_i915_gem_object *obj,99 struct sg_table *pages)100{101 dma_addr_t dma = sg_dma_address(pages->sgl);102 void *vaddr = sg_page(pages->sgl);103 104 __i915_gem_object_release_shmem(obj, pages, false);105 106 if (obj->mm.dirty) {107 struct address_space *mapping = obj->base.filp->f_mapping;108 void *src = vaddr;109 int i;110 111 for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {112 struct page *page;113 114 page = shmem_read_mapping_page(mapping, i);115 if (IS_ERR(page))116 continue;117 118 drm_clflush_virt_range(src, PAGE_SIZE);119 memcpy_to_page(page, 0, src, PAGE_SIZE);120 121 set_page_dirty(page);122 if (obj->mm.madv == I915_MADV_WILLNEED)123 mark_page_accessed(page);124 put_page(page);125 126 src += PAGE_SIZE;127 }128 obj->mm.dirty = false;129 }130 131 sg_free_table(pages);132 kfree(pages);133 134 dma_free_coherent(obj->base.dev->dev,135 roundup_pow_of_two(obj->base.size),136 vaddr, dma);137}138 139int i915_gem_object_pwrite_phys(struct drm_i915_gem_object *obj,140 const struct drm_i915_gem_pwrite *args)141{142 void *vaddr = sg_page(obj->mm.pages->sgl) + args->offset;143 char __user *user_data = u64_to_user_ptr(args->data_ptr);144 struct drm_i915_private *i915 = to_i915(obj->base.dev);145 int err;146 147 err = i915_gem_object_wait(obj,148 I915_WAIT_INTERRUPTIBLE |149 I915_WAIT_ALL,150 MAX_SCHEDULE_TIMEOUT);151 if (err)152 return err;153 154 /*155 * We manually control the domain here and pretend that it156 * remains coherent i.e. in the GTT domain, like shmem_pwrite.157 */158 i915_gem_object_invalidate_frontbuffer(obj, ORIGIN_CPU);159 160 if (copy_from_user(vaddr, user_data, args->size))161 return -EFAULT;162 163 drm_clflush_virt_range(vaddr, args->size);164 intel_gt_chipset_flush(to_gt(i915));165 166 i915_gem_object_flush_frontbuffer(obj, ORIGIN_CPU);167 return 0;168}169 170int i915_gem_object_pread_phys(struct drm_i915_gem_object *obj,171 const struct drm_i915_gem_pread *args)172{173 void *vaddr = sg_page(obj->mm.pages->sgl) + args->offset;174 char __user *user_data = u64_to_user_ptr(args->data_ptr);175 int err;176 177 err = i915_gem_object_wait(obj,178 I915_WAIT_INTERRUPTIBLE,179 MAX_SCHEDULE_TIMEOUT);180 if (err)181 return err;182 183 drm_clflush_virt_range(vaddr, args->size);184 if (copy_to_user(user_data, vaddr, args->size))185 return -EFAULT;186 187 return 0;188}189 190static int i915_gem_object_shmem_to_phys(struct drm_i915_gem_object *obj)191{192 struct sg_table *pages;193 int err;194 195 pages = __i915_gem_object_unset_pages(obj);196 197 err = i915_gem_object_get_pages_phys(obj);198 if (err)199 goto err_xfer;200 201 /* Perma-pin (until release) the physical set of pages */202 __i915_gem_object_pin_pages(obj);203 204 if (!IS_ERR_OR_NULL(pages))205 i915_gem_object_put_pages_shmem(obj, pages);206 207 i915_gem_object_release_memory_region(obj);208 return 0;209 210err_xfer:211 if (!IS_ERR_OR_NULL(pages))212 __i915_gem_object_set_pages(obj, pages);213 return err;214}215 216int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align)217{218 int err;219 220 assert_object_held(obj);221 222 if (align > obj->base.size)223 return -EINVAL;224 225 if (!i915_gem_object_is_shmem(obj))226 return -EINVAL;227 228 if (!i915_gem_object_has_struct_page(obj))229 return 0;230 231 err = i915_gem_object_unbind(obj, I915_GEM_OBJECT_UNBIND_ACTIVE);232 if (err)233 return err;234 235 if (obj->mm.madv != I915_MADV_WILLNEED)236 return -EFAULT;237 238 if (i915_gem_object_has_tiling_quirk(obj))239 return -EFAULT;240 241 if (obj->mm.mapping || i915_gem_object_has_pinned_pages(obj))242 return -EBUSY;243 244 if (unlikely(obj->mm.madv != I915_MADV_WILLNEED)) {245 drm_dbg(obj->base.dev,246 "Attempting to obtain a purgeable object\n");247 return -EFAULT;248 }249 250 return i915_gem_object_shmem_to_phys(obj);251}252 253#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)254#include "selftests/i915_gem_phys.c"255#endif256