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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_region.h"
17#include "i915_scatterlist.h"
18
19static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
20{
21 struct address_space *mapping = obj->base.filp->f_mapping;
22 struct scatterlist *sg;
23 struct sg_table *st;
24 dma_addr_t dma;
25 void *vaddr;
26 void *dst;
27 int i;
28
29 if (GEM_WARN_ON(i915_gem_object_needs_bit17_swizzle(obj)))
30 return -EINVAL;
31
32
33
34
35
36
37 vaddr = dma_alloc_coherent(obj->base.dev->dev,
38 roundup_pow_of_two(obj->base.size),
39 &dma, GFP_KERNEL);
40 if (!vaddr)
41 return -ENOMEM;
42
43 st = kmalloc(sizeof(*st), GFP_KERNEL);
44 if (!st)
45 goto err_pci;
46
47 if (sg_alloc_table(st, 1, GFP_KERNEL))
48 goto err_st;
49
50 sg = st->sgl;
51 sg->offset = 0;
52 sg->length = obj->base.size;
53
54 sg_assign_page(sg, (struct page *)vaddr);
55 sg_dma_address(sg) = dma;
56 sg_dma_len(sg) = obj->base.size;
57
58 dst = vaddr;
59 for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {
60 struct page *page;
61 void *src;
62
63 page = shmem_read_mapping_page(mapping, i);
64 if (IS_ERR(page))
65 goto err_st;
66
67 src = kmap_atomic(page);
68 memcpy(dst, src, PAGE_SIZE);
69 drm_clflush_virt_range(dst, PAGE_SIZE);
70 kunmap_atomic(src);
71
72 put_page(page);
73 dst += PAGE_SIZE;
74 }
75
76 intel_gt_chipset_flush(&to_i915(obj->base.dev)->gt);
77
78
79 obj->mem_flags &= ~I915_BO_FLAG_STRUCT_PAGE;
80 __i915_gem_object_set_pages(obj, st, sg->length);
81
82 return 0;
83
84err_st:
85 kfree(st);
86err_pci:
87 dma_free_coherent(obj->base.dev->dev,
88 roundup_pow_of_two(obj->base.size),
89 vaddr, dma);
90 return -ENOMEM;
91}
92
93void
94i915_gem_object_put_pages_phys(struct drm_i915_gem_object *obj,
95 struct sg_table *pages)
96{
97 dma_addr_t dma = sg_dma_address(pages->sgl);
98 void *vaddr = sg_page(pages->sgl);
99
100 __i915_gem_object_release_shmem(obj, pages, false);
101
102 if (obj->mm.dirty) {
103 struct address_space *mapping = obj->base.filp->f_mapping;
104 void *src = vaddr;
105 int i;
106
107 for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {
108 struct page *page;
109 char *dst;
110
111 page = shmem_read_mapping_page(mapping, i);
112 if (IS_ERR(page))
113 continue;
114
115 dst = kmap_atomic(page);
116 drm_clflush_virt_range(src, PAGE_SIZE);
117 memcpy(dst, src, PAGE_SIZE);
118 kunmap_atomic(dst);
119
120 set_page_dirty(page);
121 if (obj->mm.madv == I915_MADV_WILLNEED)
122 mark_page_accessed(page);
123 put_page(page);
124
125 src += PAGE_SIZE;
126 }
127 obj->mm.dirty = false;
128 }
129
130 sg_free_table(pages);
131 kfree(pages);
132
133 dma_free_coherent(obj->base.dev->dev,
134 roundup_pow_of_two(obj->base.size),
135 vaddr, dma);
136}
137
138int i915_gem_object_pwrite_phys(struct drm_i915_gem_object *obj,
139 const struct drm_i915_gem_pwrite *args)
140{
141 void *vaddr = sg_page(obj->mm.pages->sgl) + args->offset;
142 char __user *user_data = u64_to_user_ptr(args->data_ptr);
143 int err;
144
145 err = i915_gem_object_wait(obj,
146 I915_WAIT_INTERRUPTIBLE |
147 I915_WAIT_ALL,
148 MAX_SCHEDULE_TIMEOUT);
149 if (err)
150 return err;
151
152
153
154
155
156 i915_gem_object_invalidate_frontbuffer(obj, ORIGIN_CPU);
157
158 if (copy_from_user(vaddr, user_data, args->size))
159 return -EFAULT;
160
161 drm_clflush_virt_range(vaddr, args->size);
162 intel_gt_chipset_flush(&to_i915(obj->base.dev)->gt);
163
164 i915_gem_object_flush_frontbuffer(obj, ORIGIN_CPU);
165 return 0;
166}
167
168int i915_gem_object_pread_phys(struct drm_i915_gem_object *obj,
169 const struct drm_i915_gem_pread *args)
170{
171 void *vaddr = sg_page(obj->mm.pages->sgl) + args->offset;
172 char __user *user_data = u64_to_user_ptr(args->data_ptr);
173 int err;
174
175 err = i915_gem_object_wait(obj,
176 I915_WAIT_INTERRUPTIBLE,
177 MAX_SCHEDULE_TIMEOUT);
178 if (err)
179 return err;
180
181 drm_clflush_virt_range(vaddr, args->size);
182 if (copy_to_user(user_data, vaddr, args->size))
183 return -EFAULT;
184
185 return 0;
186}
187
188static int i915_gem_object_shmem_to_phys(struct drm_i915_gem_object *obj)
189{
190 struct sg_table *pages;
191 int err;
192
193 pages = __i915_gem_object_unset_pages(obj);
194
195 err = i915_gem_object_get_pages_phys(obj);
196 if (err)
197 goto err_xfer;
198
199
200 __i915_gem_object_pin_pages(obj);
201
202 if (!IS_ERR_OR_NULL(pages))
203 i915_gem_object_put_pages_shmem(obj, pages);
204
205 i915_gem_object_release_memory_region(obj);
206 return 0;
207
208err_xfer:
209 if (!IS_ERR_OR_NULL(pages)) {
210 unsigned int sg_page_sizes = i915_sg_dma_sizes(pages->sgl);
211
212 __i915_gem_object_set_pages(obj, pages, sg_page_sizes);
213 }
214 return err;
215}
216
217int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align)
218{
219 int err;
220
221 assert_object_held(obj);
222
223 if (align > obj->base.size)
224 return -EINVAL;
225
226 if (!i915_gem_object_is_shmem(obj))
227 return -EINVAL;
228
229 if (!i915_gem_object_has_struct_page(obj))
230 return 0;
231
232 err = i915_gem_object_unbind(obj, I915_GEM_OBJECT_UNBIND_ACTIVE);
233 if (err)
234 return err;
235
236 if (obj->mm.madv != I915_MADV_WILLNEED)
237 return -EFAULT;
238
239 if (i915_gem_object_has_tiling_quirk(obj))
240 return -EFAULT;
241
242 if (obj->mm.mapping || i915_gem_object_has_pinned_pages(obj))
243 return -EBUSY;
244
245 if (unlikely(obj->mm.madv != I915_MADV_WILLNEED)) {
246 drm_dbg(obj->base.dev,
247 "Attempting to obtain a purgeable object\n");
248 return -EFAULT;
249 }
250
251 return i915_gem_object_shmem_to_phys(obj);
252}
253
254#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
255#include "selftests/i915_gem_phys.c"
256#endif
257
