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1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2020 Intel Corporation
4 */
5
6#include <linux/iosys-map.h>
7#include <linux/mm.h>
8#include <linux/pagemap.h>
9#include <linux/shmem_fs.h>
10
11#include "gem/i915_gem_object.h"
12#include "gem/i915_gem_lmem.h"
13#include "shmem_utils.h"
14
15struct file *shmem_create_from_data(const char *name, void *data, size_t len)
16{
17 struct file *file;
18 int err;
19
20 file = shmem_file_setup(name, PAGE_ALIGN(len), VM_NORESERVE);
21 if (IS_ERR(file))
22 return file;
23
24 err = shmem_write(file, 0, data, len);
25 if (err) {
26 fput(file);
27 return ERR_PTR(err);
28 }
29
30 return file;
31}
32
33struct file *shmem_create_from_object(struct drm_i915_gem_object *obj)
34{
35 struct file *file;
36 void *ptr;
37
38 if (i915_gem_object_is_shmem(obj)) {
39 file = obj->base.filp;
40 atomic_long_inc(&file->f_count);
41 return file;
42 }
43
44 ptr = i915_gem_object_pin_map_unlocked(obj, i915_gem_object_is_lmem(obj) ?
45 I915_MAP_WC : I915_MAP_WB);
46 if (IS_ERR(ptr))
47 return ERR_CAST(ptr);
48
49 file = shmem_create_from_data("", ptr, obj->base.size);
50 i915_gem_object_unpin_map(obj);
51
52 return file;
53}
54
55void *shmem_pin_map(struct file *file)
56{
57 struct page **pages;
58 size_t n_pages, i;
59 void *vaddr;
60
61 n_pages = file->f_mapping->host->i_size >> PAGE_SHIFT;
62 pages = kvmalloc_array(n_pages, sizeof(*pages), GFP_KERNEL);
63 if (!pages)
64 return NULL;
65
66 for (i = 0; i < n_pages; i++) {
67 pages[i] = shmem_read_mapping_page_gfp(file->f_mapping, i,
68 GFP_KERNEL);
69 if (IS_ERR(pages[i]))
70 goto err_page;
71 }
72
73 vaddr = vmap(pages, n_pages, VM_MAP_PUT_PAGES, PAGE_KERNEL);
74 if (!vaddr)
75 goto err_page;
76 mapping_set_unevictable(file->f_mapping);
77 return vaddr;
78err_page:
79 while (i--)
80 put_page(pages[i]);
81 kvfree(pages);
82 return NULL;
83}
84
85void shmem_unpin_map(struct file *file, void *ptr)
86{
87 mapping_clear_unevictable(file->f_mapping);
88 vfree(ptr);
89}
90
91static int __shmem_rw(struct file *file, loff_t off,
92 void *ptr, size_t len,
93 bool write)
94{
95 unsigned long pfn;
96
97 for (pfn = off >> PAGE_SHIFT; len; pfn++) {
98 unsigned int this =
99 min_t(size_t, PAGE_SIZE - offset_in_page(off), len);
100 struct page *page;
101 void *vaddr;
102
103 page = shmem_read_mapping_page_gfp(file->f_mapping, pfn,
104 GFP_KERNEL);
105 if (IS_ERR(page))
106 return PTR_ERR(page);
107
108 vaddr = kmap(page);
109 if (write) {
110 memcpy(vaddr + offset_in_page(off), ptr, this);
111 set_page_dirty(page);
112 } else {
113 memcpy(ptr, vaddr + offset_in_page(off), this);
114 }
115 mark_page_accessed(page);
116 kunmap(page);
117 put_page(page);
118
119 len -= this;
120 ptr += this;
121 off = 0;
122 }
123
124 return 0;
125}
126
127int shmem_read_to_iosys_map(struct file *file, loff_t off,
128 struct iosys_map *map, size_t map_off, size_t len)
129{
130 unsigned long pfn;
131
132 for (pfn = off >> PAGE_SHIFT; len; pfn++) {
133 unsigned int this =
134 min_t(size_t, PAGE_SIZE - offset_in_page(off), len);
135 struct page *page;
136 void *vaddr;
137
138 page = shmem_read_mapping_page_gfp(file->f_mapping, pfn,
139 GFP_KERNEL);
140 if (IS_ERR(page))
141 return PTR_ERR(page);
142
143 vaddr = kmap(page);
144 iosys_map_memcpy_to(map, map_off, vaddr + offset_in_page(off),
145 this);
146 mark_page_accessed(page);
147 kunmap(page);
148 put_page(page);
149
150 len -= this;
151 map_off += this;
152 off = 0;
153 }
154
155 return 0;
156}
157
158int shmem_read(struct file *file, loff_t off, void *dst, size_t len)
159{
160 return __shmem_rw(file, off, dst, len, false);
161}
162
163int shmem_write(struct file *file, loff_t off, void *src, size_t len)
164{
165 return __shmem_rw(file, off, src, len, true);
166}
167
168#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
169#include "st_shmem_utils.c"
170#endif
1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2020 Intel Corporation
4 */
5
6#include <linux/iosys-map.h>
7#include <linux/mm.h>
8#include <linux/pagemap.h>
9#include <linux/shmem_fs.h>
10
11#include "i915_drv.h"
12#include "gem/i915_gem_object.h"
13#include "gem/i915_gem_lmem.h"
14#include "shmem_utils.h"
15
16struct file *shmem_create_from_data(const char *name, void *data, size_t len)
17{
18 struct file *file;
19 int err;
20
21 file = shmem_file_setup(name, PAGE_ALIGN(len), VM_NORESERVE);
22 if (IS_ERR(file))
23 return file;
24
25 err = shmem_write(file, 0, data, len);
26 if (err) {
27 fput(file);
28 return ERR_PTR(err);
29 }
30
31 return file;
32}
33
34struct file *shmem_create_from_object(struct drm_i915_gem_object *obj)
35{
36 enum i915_map_type map_type;
37 struct file *file;
38 void *ptr;
39
40 if (i915_gem_object_is_shmem(obj)) {
41 file = obj->base.filp;
42 atomic_long_inc(&file->f_count);
43 return file;
44 }
45
46 map_type = i915_gem_object_is_lmem(obj) ? I915_MAP_WC : I915_MAP_WB;
47 ptr = i915_gem_object_pin_map_unlocked(obj, map_type);
48 if (IS_ERR(ptr))
49 return ERR_CAST(ptr);
50
51 file = shmem_create_from_data("", ptr, obj->base.size);
52 i915_gem_object_unpin_map(obj);
53
54 return file;
55}
56
57void *shmem_pin_map(struct file *file)
58{
59 struct page **pages;
60 size_t n_pages, i;
61 void *vaddr;
62
63 n_pages = file->f_mapping->host->i_size >> PAGE_SHIFT;
64 pages = kvmalloc_array(n_pages, sizeof(*pages), GFP_KERNEL);
65 if (!pages)
66 return NULL;
67
68 for (i = 0; i < n_pages; i++) {
69 pages[i] = shmem_read_mapping_page_gfp(file->f_mapping, i,
70 GFP_KERNEL);
71 if (IS_ERR(pages[i]))
72 goto err_page;
73 }
74
75 vaddr = vmap(pages, n_pages, VM_MAP_PUT_PAGES, PAGE_KERNEL);
76 if (!vaddr)
77 goto err_page;
78 mapping_set_unevictable(file->f_mapping);
79 return vaddr;
80err_page:
81 while (i--)
82 put_page(pages[i]);
83 kvfree(pages);
84 return NULL;
85}
86
87void shmem_unpin_map(struct file *file, void *ptr)
88{
89 mapping_clear_unevictable(file->f_mapping);
90 vfree(ptr);
91}
92
93static int __shmem_rw(struct file *file, loff_t off,
94 void *ptr, size_t len,
95 bool write)
96{
97 unsigned long pfn;
98
99 for (pfn = off >> PAGE_SHIFT; len; pfn++) {
100 unsigned int this =
101 min_t(size_t, PAGE_SIZE - offset_in_page(off), len);
102 struct page *page;
103 void *vaddr;
104
105 page = shmem_read_mapping_page_gfp(file->f_mapping, pfn,
106 GFP_KERNEL);
107 if (IS_ERR(page))
108 return PTR_ERR(page);
109
110 vaddr = kmap(page);
111 if (write) {
112 memcpy(vaddr + offset_in_page(off), ptr, this);
113 set_page_dirty(page);
114 } else {
115 memcpy(ptr, vaddr + offset_in_page(off), this);
116 }
117 mark_page_accessed(page);
118 kunmap(page);
119 put_page(page);
120
121 len -= this;
122 ptr += this;
123 off = 0;
124 }
125
126 return 0;
127}
128
129int shmem_read_to_iosys_map(struct file *file, loff_t off,
130 struct iosys_map *map, size_t map_off, size_t len)
131{
132 unsigned long pfn;
133
134 for (pfn = off >> PAGE_SHIFT; len; pfn++) {
135 unsigned int this =
136 min_t(size_t, PAGE_SIZE - offset_in_page(off), len);
137 struct page *page;
138 void *vaddr;
139
140 page = shmem_read_mapping_page_gfp(file->f_mapping, pfn,
141 GFP_KERNEL);
142 if (IS_ERR(page))
143 return PTR_ERR(page);
144
145 vaddr = kmap(page);
146 iosys_map_memcpy_to(map, map_off, vaddr + offset_in_page(off),
147 this);
148 mark_page_accessed(page);
149 kunmap(page);
150 put_page(page);
151
152 len -= this;
153 map_off += this;
154 off = 0;
155 }
156
157 return 0;
158}
159
160int shmem_read(struct file *file, loff_t off, void *dst, size_t len)
161{
162 return __shmem_rw(file, off, dst, len, false);
163}
164
165int shmem_write(struct file *file, loff_t off, void *src, size_t len)
166{
167 return __shmem_rw(file, off, src, len, true);
168}
169
170#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
171#include "st_shmem_utils.c"
172#endif