]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-c -*- */ |
2 | /** | |
3 | * \file drm_pci.c | |
4 | * \brief Functions and ioctls to manage PCI memory | |
5 | * | |
6 | * \warning These interfaces aren't stable yet. | |
7 | * | |
8 | * \todo Implement the remaining ioctl's for the PCI pools. | |
9 | * \todo The wrappers here are so thin that they would be better off inlined.. | |
10 | * | |
11 | * \author Jose Fonseca <jrfonseca@tungstengraphics.com> | |
12 | * \author Leif Delgass <ldelgass@retinalburn.net> | |
13 | */ | |
14 | ||
15 | /* | |
16 | * Copyright 2003 Jos�Fonseca. | |
17 | * Copyright 2003 Leif Delgass. | |
18 | * All Rights Reserved. | |
19 | * | |
20 | * Permission is hereby granted, free of charge, to any person obtaining a | |
21 | * copy of this software and associated documentation files (the "Software"), | |
22 | * to deal in the Software without restriction, including without limitation | |
23 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
24 | * and/or sell copies of the Software, and to permit persons to whom the | |
25 | * Software is furnished to do so, subject to the following conditions: | |
26 | * | |
27 | * The above copyright notice and this permission notice (including the next | |
28 | * paragraph) shall be included in all copies or substantial portions of the | |
29 | * Software. | |
30 | * | |
31 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
32 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
33 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
34 | * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
35 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION | |
36 | * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
37 | */ | |
38 | ||
39 | #include <linux/pci.h> | |
40 | #include "drmP.h" | |
41 | ||
42 | /**********************************************************************/ | |
43 | /** \name PCI memory */ | |
44 | /*@{*/ | |
45 | ||
46 | /** | |
47 | * \brief Allocate a PCI consistent memory block, for DMA. | |
48 | */ | |
49 | void *drm_pci_alloc(drm_device_t * dev, size_t size, size_t align, | |
50 | dma_addr_t maxaddr, dma_addr_t * busaddr) | |
51 | { | |
52 | void *address; | |
53 | #if DRM_DEBUG_MEMORY | |
54 | int area = DRM_MEM_DMA; | |
55 | ||
56 | spin_lock(&drm_mem_lock); | |
57 | if ((drm_ram_used >> PAGE_SHIFT) | |
58 | > (DRM_RAM_PERCENT * drm_ram_available) / 100) { | |
59 | spin_unlock(&drm_mem_lock); | |
60 | return 0; | |
61 | } | |
62 | spin_unlock(&drm_mem_lock); | |
63 | #endif | |
64 | ||
65 | /* pci_alloc_consistent only guarantees alignment to the smallest | |
66 | * PAGE_SIZE order which is greater than or equal to the requested size. | |
67 | * Return NULL here for now to make sure nobody tries for larger alignment | |
68 | */ | |
69 | if (align > size) | |
70 | return NULL; | |
71 | ||
72 | if (pci_set_dma_mask(dev->pdev, maxaddr) != 0) { | |
73 | DRM_ERROR("Setting pci dma mask failed\n"); | |
74 | return NULL; | |
75 | } | |
76 | ||
77 | address = pci_alloc_consistent(dev->pdev, size, busaddr); | |
78 | ||
79 | #if DRM_DEBUG_MEMORY | |
80 | if (address == NULL) { | |
81 | spin_lock(&drm_mem_lock); | |
82 | ++drm_mem_stats[area].fail_count; | |
83 | spin_unlock(&drm_mem_lock); | |
84 | return NULL; | |
85 | } | |
86 | ||
87 | spin_lock(&drm_mem_lock); | |
88 | ++drm_mem_stats[area].succeed_count; | |
89 | drm_mem_stats[area].bytes_allocated += size; | |
90 | drm_ram_used += size; | |
91 | spin_unlock(&drm_mem_lock); | |
92 | #else | |
93 | if (address == NULL) | |
94 | return NULL; | |
95 | #endif | |
96 | ||
97 | memset(address, 0, size); | |
98 | ||
99 | return address; | |
100 | } | |
101 | EXPORT_SYMBOL(drm_pci_alloc); | |
102 | ||
103 | /** | |
104 | * \brief Free a PCI consistent memory block. | |
105 | */ | |
106 | void | |
107 | drm_pci_free(drm_device_t * dev, size_t size, void *vaddr, dma_addr_t busaddr) | |
108 | { | |
109 | #if DRM_DEBUG_MEMORY | |
110 | int area = DRM_MEM_DMA; | |
111 | int alloc_count; | |
112 | int free_count; | |
113 | #endif | |
114 | ||
115 | if (!vaddr) { | |
116 | #if DRM_DEBUG_MEMORY | |
117 | DRM_MEM_ERROR(area, "Attempt to free address 0\n"); | |
118 | #endif | |
119 | } else { | |
120 | pci_free_consistent(dev->pdev, size, vaddr, busaddr); | |
121 | } | |
122 | ||
123 | #if DRM_DEBUG_MEMORY | |
124 | spin_lock(&drm_mem_lock); | |
125 | free_count = ++drm_mem_stats[area].free_count; | |
126 | alloc_count = drm_mem_stats[area].succeed_count; | |
127 | drm_mem_stats[area].bytes_freed += size; | |
128 | drm_ram_used -= size; | |
129 | spin_unlock(&drm_mem_lock); | |
130 | if (free_count > alloc_count) { | |
131 | DRM_MEM_ERROR(area, | |
132 | "Excess frees: %d frees, %d allocs\n", | |
133 | free_count, alloc_count); | |
134 | } | |
135 | #endif | |
136 | ||
137 | } | |
138 | EXPORT_SYMBOL(drm_pci_free); | |
139 | ||
140 | /*@}*/ |