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