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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/char/drm/drm_pci.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/char/drm/drm_pci.c')
-rw-r--r--drivers/char/drm/drm_pci.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/char/drm/drm_pci.c b/drivers/char/drm/drm_pci.c
new file mode 100644
index 000000000000..192e8762571c
--- /dev/null
+++ b/drivers/char/drm/drm_pci.c
@@ -0,0 +1,140 @@
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 */
49void *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}
101EXPORT_SYMBOL(drm_pci_alloc);
102
103/**
104 * \brief Free a PCI consistent memory block.
105 */
106void
107drm_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}
138EXPORT_SYMBOL(drm_pci_free);
139
140/*@}*/