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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.h>
12#include <drm/drm_cache.h>
13#include <drm/drm_legacy.h>
14#include <drm/drm_pci.h>
15
16#include "i915_drv.h"
17#include "i915_gem_object.h"
18#include "i915_scatterlist.h"
19
20static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
21{
22 struct address_space *mapping = obj->base.filp->f_mapping;
23 struct drm_dma_handle *phys;
24 struct sg_table *st;
25 struct scatterlist *sg;
26 char *vaddr;
27 int i;
28 int err;
29
30 if (WARN_ON(i915_gem_object_needs_bit17_swizzle(obj)))
31 return -EINVAL;
32
33
34
35
36
37 phys = drm_pci_alloc(obj->base.dev,
38 roundup_pow_of_two(obj->base.size),
39 roundup_pow_of_two(obj->base.size));
40 if (!phys)
41 return -ENOMEM;
42
43 vaddr = phys->vaddr;
44 for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {
45 struct page *page;
46 char *src;
47
48 page = shmem_read_mapping_page(mapping, i);
49 if (IS_ERR(page)) {
50 err = PTR_ERR(page);
51 goto err_phys;
52 }
53
54 src = kmap_atomic(page);
55 memcpy(vaddr, src, PAGE_SIZE);
56 drm_clflush_virt_range(vaddr, PAGE_SIZE);
57 kunmap_atomic(src);
58
59 put_page(page);
60 vaddr += PAGE_SIZE;
61 }
62
63 i915_gem_chipset_flush(to_i915(obj->base.dev));
64
65 st = kmalloc(sizeof(*st), GFP_KERNEL);
66 if (!st) {
67 err = -ENOMEM;
68 goto err_phys;
69 }
70
71 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
72 kfree(st);
73 err = -ENOMEM;
74 goto err_phys;
75 }
76
77 sg = st->sgl;
78 sg->offset = 0;
79 sg->length = obj->base.size;
80
81 sg_dma_address(sg) = phys->busaddr;
82 sg_dma_len(sg) = obj->base.size;
83
84 obj->phys_handle = phys;
85
86 __i915_gem_object_set_pages(obj, st, sg->length);
87
88 return 0;
89
90err_phys:
91 drm_pci_free(obj->base.dev, phys);
92
93 return err;
94}
95
96static void
97i915_gem_object_put_pages_phys(struct drm_i915_gem_object *obj,
98 struct sg_table *pages)
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 char *vaddr = obj->phys_handle->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(vaddr, PAGE_SIZE);
117 memcpy(dst, vaddr, 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 vaddr += PAGE_SIZE;
125 }
126 obj->mm.dirty = false;
127 }
128
129 sg_free_table(pages);
130 kfree(pages);
131
132 drm_pci_free(obj->base.dev, obj->phys_handle);
133}
134
135static void
136i915_gem_object_release_phys(struct drm_i915_gem_object *obj)
137{
138 i915_gem_object_unpin_pages(obj);
139}
140
141static const struct drm_i915_gem_object_ops i915_gem_phys_ops = {
142 .get_pages = i915_gem_object_get_pages_phys,
143 .put_pages = i915_gem_object_put_pages_phys,
144 .release = i915_gem_object_release_phys,
145};
146
147int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align)
148{
149 struct sg_table *pages;
150 int err;
151
152 if (align > obj->base.size)
153 return -EINVAL;
154
155 if (obj->ops == &i915_gem_phys_ops)
156 return 0;
157
158 if (obj->ops != &i915_gem_shmem_ops)
159 return -EINVAL;
160
161 err = i915_gem_object_unbind(obj);
162 if (err)
163 return err;
164
165 mutex_lock(&obj->mm.lock);
166
167 if (obj->mm.madv != I915_MADV_WILLNEED) {
168 err = -EFAULT;
169 goto err_unlock;
170 }
171
172 if (obj->mm.quirked) {
173 err = -EFAULT;
174 goto err_unlock;
175 }
176
177 if (obj->mm.mapping) {
178 err = -EBUSY;
179 goto err_unlock;
180 }
181
182 pages = __i915_gem_object_unset_pages(obj);
183
184 obj->ops = &i915_gem_phys_ops;
185
186 err = ____i915_gem_object_get_pages(obj);
187 if (err)
188 goto err_xfer;
189
190
191 __i915_gem_object_pin_pages(obj);
192
193 if (!IS_ERR_OR_NULL(pages))
194 i915_gem_shmem_ops.put_pages(obj, pages);
195 mutex_unlock(&obj->mm.lock);
196 return 0;
197
198err_xfer:
199 obj->ops = &i915_gem_shmem_ops;
200 if (!IS_ERR_OR_NULL(pages)) {
201 unsigned int sg_page_sizes = i915_sg_page_sizes(pages->sgl);
202
203 __i915_gem_object_set_pages(obj, pages, sg_page_sizes);
204 }
205err_unlock:
206 mutex_unlock(&obj->mm.lock);
207 return err;
208}
209
210#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
211#include "selftests/i915_gem_phys.c"
212#endif
213
