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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> | |
195b3a2d | 40 | #include <linux/dma-mapping.h> |
1da177e4 LT |
41 | #include "drmP.h" |
42 | ||
43 | /**********************************************************************/ | |
44 | /** \name PCI memory */ | |
45 | /*@{*/ | |
46 | ||
47 | /** | |
48 | * \brief Allocate a PCI consistent memory block, for DMA. | |
49 | */ | |
9c8da5eb DA |
50 | drm_dma_handle_t *drm_pci_alloc(drm_device_t * dev, size_t size, size_t align, |
51 | dma_addr_t maxaddr) | |
1da177e4 | 52 | { |
9c8da5eb | 53 | drm_dma_handle_t *dmah; |
ddf19b97 DA |
54 | #if 1 |
55 | unsigned long addr; | |
56 | size_t sz; | |
57 | #endif | |
aa0ca6b4 | 58 | #ifdef DRM_DEBUG_MEMORY |
1da177e4 LT |
59 | int area = DRM_MEM_DMA; |
60 | ||
61 | spin_lock(&drm_mem_lock); | |
62 | if ((drm_ram_used >> PAGE_SHIFT) | |
63 | > (DRM_RAM_PERCENT * drm_ram_available) / 100) { | |
64 | spin_unlock(&drm_mem_lock); | |
65 | return 0; | |
66 | } | |
67 | spin_unlock(&drm_mem_lock); | |
68 | #endif | |
69 | ||
70 | /* pci_alloc_consistent only guarantees alignment to the smallest | |
71 | * PAGE_SIZE order which is greater than or equal to the requested size. | |
72 | * Return NULL here for now to make sure nobody tries for larger alignment | |
73 | */ | |
74 | if (align > size) | |
75 | return NULL; | |
76 | ||
77 | if (pci_set_dma_mask(dev->pdev, maxaddr) != 0) { | |
78 | DRM_ERROR("Setting pci dma mask failed\n"); | |
79 | return NULL; | |
80 | } | |
81 | ||
9c8da5eb DA |
82 | dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL); |
83 | if (!dmah) | |
84 | return NULL; | |
b5e89ed5 | 85 | |
9c8da5eb | 86 | dmah->size = size; |
ddf19b97 | 87 | dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP); |
1da177e4 | 88 | |
aa0ca6b4 | 89 | #ifdef DRM_DEBUG_MEMORY |
9c8da5eb | 90 | if (dmah->vaddr == NULL) { |
1da177e4 LT |
91 | spin_lock(&drm_mem_lock); |
92 | ++drm_mem_stats[area].fail_count; | |
93 | spin_unlock(&drm_mem_lock); | |
9c8da5eb | 94 | kfree(dmah); |
1da177e4 LT |
95 | return NULL; |
96 | } | |
97 | ||
98 | spin_lock(&drm_mem_lock); | |
99 | ++drm_mem_stats[area].succeed_count; | |
100 | drm_mem_stats[area].bytes_allocated += size; | |
101 | drm_ram_used += size; | |
102 | spin_unlock(&drm_mem_lock); | |
103 | #else | |
9c8da5eb DA |
104 | if (dmah->vaddr == NULL) { |
105 | kfree(dmah); | |
1da177e4 | 106 | return NULL; |
9c8da5eb | 107 | } |
1da177e4 LT |
108 | #endif |
109 | ||
9c8da5eb | 110 | memset(dmah->vaddr, 0, size); |
1da177e4 | 111 | |
ddf19b97 DA |
112 | /* XXX - Is virt_to_page() legal for consistent mem? */ |
113 | /* Reserve */ | |
114 | for (addr = (unsigned long)dmah->vaddr, sz = size; | |
115 | sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { | |
116 | SetPageReserved(virt_to_page(addr)); | |
117 | } | |
118 | ||
9c8da5eb | 119 | return dmah; |
1da177e4 | 120 | } |
b5e89ed5 | 121 | |
1da177e4 LT |
122 | EXPORT_SYMBOL(drm_pci_alloc); |
123 | ||
124 | /** | |
ddf19b97 | 125 | * \brief Free a PCI consistent memory block without freeing its descriptor. |
9c8da5eb DA |
126 | * |
127 | * This function is for internal use in the Linux-specific DRM core code. | |
1da177e4 | 128 | */ |
b5e89ed5 | 129 | void __drm_pci_free(drm_device_t * dev, drm_dma_handle_t * dmah) |
1da177e4 | 130 | { |
ddf19b97 DA |
131 | #if 1 |
132 | unsigned long addr; | |
133 | size_t sz; | |
134 | #endif | |
aa0ca6b4 | 135 | #ifdef DRM_DEBUG_MEMORY |
1da177e4 LT |
136 | int area = DRM_MEM_DMA; |
137 | int alloc_count; | |
138 | int free_count; | |
139 | #endif | |
140 | ||
9c8da5eb | 141 | if (!dmah->vaddr) { |
aa0ca6b4 | 142 | #ifdef DRM_DEBUG_MEMORY |
1da177e4 LT |
143 | DRM_MEM_ERROR(area, "Attempt to free address 0\n"); |
144 | #endif | |
145 | } else { | |
ddf19b97 DA |
146 | /* XXX - Is virt_to_page() legal for consistent mem? */ |
147 | /* Unreserve */ | |
148 | for (addr = (unsigned long)dmah->vaddr, sz = dmah->size; | |
149 | sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { | |
150 | ClearPageReserved(virt_to_page(addr)); | |
151 | } | |
152 | dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, | |
153 | dmah->busaddr); | |
1da177e4 LT |
154 | } |
155 | ||
aa0ca6b4 | 156 | #ifdef DRM_DEBUG_MEMORY |
1da177e4 LT |
157 | spin_lock(&drm_mem_lock); |
158 | free_count = ++drm_mem_stats[area].free_count; | |
159 | alloc_count = drm_mem_stats[area].succeed_count; | |
160 | drm_mem_stats[area].bytes_freed += size; | |
161 | drm_ram_used -= size; | |
162 | spin_unlock(&drm_mem_lock); | |
163 | if (free_count > alloc_count) { | |
164 | DRM_MEM_ERROR(area, | |
165 | "Excess frees: %d frees, %d allocs\n", | |
166 | free_count, alloc_count); | |
167 | } | |
168 | #endif | |
169 | ||
170 | } | |
9c8da5eb DA |
171 | |
172 | /** | |
173 | * \brief Free a PCI consistent memory block | |
174 | */ | |
b5e89ed5 | 175 | void drm_pci_free(drm_device_t * dev, drm_dma_handle_t * dmah) |
9c8da5eb DA |
176 | { |
177 | __drm_pci_free(dev, dmah); | |
178 | kfree(dmah); | |
179 | } | |
b5e89ed5 | 180 | |
1da177e4 LT |
181 | EXPORT_SYMBOL(drm_pci_free); |
182 | ||
183 | /*@}*/ |