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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 | * | |
96de0e25 | 11 | * \author José Fonseca <jrfonseca@tungstengraphics.com> |
1da177e4 LT |
12 | * \author Leif Delgass <ldelgass@retinalburn.net> |
13 | */ | |
14 | ||
15 | /* | |
96de0e25 | 16 | * Copyright 2003 José Fonseca. |
1da177e4 LT |
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> | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
195b3a2d | 41 | #include <linux/dma-mapping.h> |
1da177e4 LT |
42 | #include "drmP.h" |
43 | ||
44 | /**********************************************************************/ | |
45 | /** \name PCI memory */ | |
46 | /*@{*/ | |
47 | ||
48 | /** | |
49 | * \brief Allocate a PCI consistent memory block, for DMA. | |
50 | */ | |
e6be8d9d | 51 | drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align) |
1da177e4 | 52 | { |
9c8da5eb | 53 | drm_dma_handle_t *dmah; |
ddf19b97 DA |
54 | #if 1 |
55 | unsigned long addr; | |
56 | size_t sz; | |
57 | #endif | |
1da177e4 LT |
58 | |
59 | /* pci_alloc_consistent only guarantees alignment to the smallest | |
60 | * PAGE_SIZE order which is greater than or equal to the requested size. | |
61 | * Return NULL here for now to make sure nobody tries for larger alignment | |
62 | */ | |
63 | if (align > size) | |
64 | return NULL; | |
65 | ||
9c8da5eb DA |
66 | dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL); |
67 | if (!dmah) | |
68 | return NULL; | |
b5e89ed5 | 69 | |
9c8da5eb | 70 | dmah->size = size; |
ddf19b97 | 71 | dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP); |
1da177e4 | 72 | |
9c8da5eb DA |
73 | if (dmah->vaddr == NULL) { |
74 | kfree(dmah); | |
1da177e4 | 75 | return NULL; |
9c8da5eb | 76 | } |
1da177e4 | 77 | |
9c8da5eb | 78 | memset(dmah->vaddr, 0, size); |
1da177e4 | 79 | |
ddf19b97 DA |
80 | /* XXX - Is virt_to_page() legal for consistent mem? */ |
81 | /* Reserve */ | |
82 | for (addr = (unsigned long)dmah->vaddr, sz = size; | |
83 | sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { | |
84 | SetPageReserved(virt_to_page(addr)); | |
85 | } | |
86 | ||
9c8da5eb | 87 | return dmah; |
1da177e4 | 88 | } |
b5e89ed5 | 89 | |
1da177e4 LT |
90 | EXPORT_SYMBOL(drm_pci_alloc); |
91 | ||
92 | /** | |
ddf19b97 | 93 | * \brief Free a PCI consistent memory block without freeing its descriptor. |
9c8da5eb DA |
94 | * |
95 | * This function is for internal use in the Linux-specific DRM core code. | |
1da177e4 | 96 | */ |
84b1fd10 | 97 | void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) |
1da177e4 | 98 | { |
ddf19b97 DA |
99 | #if 1 |
100 | unsigned long addr; | |
101 | size_t sz; | |
102 | #endif | |
1da177e4 | 103 | |
9a298b2a | 104 | if (dmah->vaddr) { |
ddf19b97 DA |
105 | /* XXX - Is virt_to_page() legal for consistent mem? */ |
106 | /* Unreserve */ | |
107 | for (addr = (unsigned long)dmah->vaddr, sz = dmah->size; | |
108 | sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { | |
109 | ClearPageReserved(virt_to_page(addr)); | |
110 | } | |
111 | dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, | |
112 | dmah->busaddr); | |
1da177e4 | 113 | } |
1da177e4 | 114 | } |
9c8da5eb DA |
115 | |
116 | /** | |
117 | * \brief Free a PCI consistent memory block | |
118 | */ | |
84b1fd10 | 119 | void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) |
9c8da5eb DA |
120 | { |
121 | __drm_pci_free(dev, dmah); | |
122 | kfree(dmah); | |
123 | } | |
b5e89ed5 | 124 | |
1da177e4 LT |
125 | EXPORT_SYMBOL(drm_pci_free); |
126 | ||
127 | /*@}*/ |