3 * IOCTLs to manage scatter/gather memory
5 * \author Gareth Hughes <gareth@valinux.com>
9 * Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com
11 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
12 * All Rights Reserved.
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15 * copy of this software and associated documentation files (the "Software"),
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19 * Software is furnished to do so, subject to the following conditions:
21 * The above copyright notice and this permission notice (including the next
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26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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34 #include <linux/vmalloc.h>
35 #include <linux/slab.h>
38 #define DEBUG_SCATTER 0
40 static inline void *drm_vmalloc_dma(unsigned long size
)
42 #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
43 return __vmalloc(size
, GFP_KERNEL
, PAGE_KERNEL
| _PAGE_NO_CACHE
);
45 return vmalloc_32(size
);
49 void drm_sg_cleanup(struct drm_sg_mem
* entry
)
54 for (i
= 0; i
< entry
->pages
; i
++) {
55 page
= entry
->pagelist
[i
];
57 ClearPageReserved(page
);
60 vfree(entry
->virtual);
62 kfree(entry
->busaddr
);
63 kfree(entry
->pagelist
);
68 # define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1)))
70 # define ScatterHandle(x) (unsigned int)(x)
73 int drm_sg_alloc(struct drm_device
*dev
, void *data
,
74 struct drm_file
*file_priv
)
76 struct drm_scatter_gather
*request
= data
;
77 struct drm_sg_mem
*entry
;
78 unsigned long pages
, i
, j
;
82 if (!drm_core_check_feature(dev
, DRIVER_SG
))
88 entry
= kzalloc(sizeof(*entry
), GFP_KERNEL
);
92 pages
= (request
->size
+ PAGE_SIZE
- 1) / PAGE_SIZE
;
93 DRM_DEBUG("size=%ld pages=%ld\n", request
->size
, pages
);
96 entry
->pagelist
= kcalloc(pages
, sizeof(*entry
->pagelist
), GFP_KERNEL
);
97 if (!entry
->pagelist
) {
102 entry
->busaddr
= kcalloc(pages
, sizeof(*entry
->busaddr
), GFP_KERNEL
);
103 if (!entry
->busaddr
) {
104 kfree(entry
->pagelist
);
109 entry
->virtual = drm_vmalloc_dma(pages
<< PAGE_SHIFT
);
110 if (!entry
->virtual) {
111 kfree(entry
->busaddr
);
112 kfree(entry
->pagelist
);
117 /* This also forces the mapping of COW pages, so our page list
118 * will be valid. Please don't remove it...
120 memset(entry
->virtual, 0, pages
<< PAGE_SHIFT
);
122 entry
->handle
= ScatterHandle((unsigned long)entry
->virtual);
124 DRM_DEBUG("handle = %08lx\n", entry
->handle
);
125 DRM_DEBUG("virtual = %p\n", entry
->virtual);
127 for (i
= (unsigned long)entry
->virtual, j
= 0; j
< pages
;
128 i
+= PAGE_SIZE
, j
++) {
129 entry
->pagelist
[j
] = vmalloc_to_page((void *)i
);
130 if (!entry
->pagelist
[j
])
132 SetPageReserved(entry
->pagelist
[j
]);
135 request
->handle
= entry
->handle
;
140 /* Verify that each page points to its virtual address, and vice
146 for (i
= 0; i
< pages
; i
++) {
149 tmp
= page_address(entry
->pagelist
[i
]);
151 j
< PAGE_SIZE
/ sizeof(unsigned long);
155 tmp
= (unsigned long *)((u8
*) entry
->virtual +
158 j
< PAGE_SIZE
/ sizeof(unsigned long);
160 if (*tmp
!= 0xcafebabe && error
== 0) {
162 DRM_ERROR("Scatter allocation error, "
163 "pagelist does not match "
164 "virtual mapping\n");
167 tmp
= page_address(entry
->pagelist
[i
]);
169 j
< PAGE_SIZE
/ sizeof(unsigned long);
175 DRM_ERROR("Scatter allocation matches pagelist\n");
182 drm_sg_cleanup(entry
);
186 int drm_sg_free(struct drm_device
*dev
, void *data
,
187 struct drm_file
*file_priv
)
189 struct drm_scatter_gather
*request
= data
;
190 struct drm_sg_mem
*entry
;
192 if (!drm_core_check_feature(dev
, DRIVER_SG
))
198 if (!entry
|| entry
->handle
!= request
->handle
)
201 DRM_DEBUG("virtual = %p\n", entry
->virtual);
203 drm_sg_cleanup(entry
);
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