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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 */
49drm_dma_handle_t *drm_pci_alloc(drm_device_t * dev, size_t size, size_t align,
50 dma_addr_t maxaddr)
51{
52 drm_dma_handle_t *dmah;
53#ifdef 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 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
78 if (!dmah)
79 return NULL;
80
81 dmah->size = size;
82 dmah->vaddr = pci_alloc_consistent(dev->pdev, size, &dmah->busaddr);
83
84#ifdef DRM_DEBUG_MEMORY
85 if (dmah->vaddr == NULL) {
86 spin_lock(&drm_mem_lock);
87 ++drm_mem_stats[area].fail_count;
88 spin_unlock(&drm_mem_lock);
89 kfree(dmah);
90 return NULL;
91 }
92
93 spin_lock(&drm_mem_lock);
94 ++drm_mem_stats[area].succeed_count;
95 drm_mem_stats[area].bytes_allocated += size;
96 drm_ram_used += size;
97 spin_unlock(&drm_mem_lock);
98#else
99 if (dmah->vaddr == NULL) {
100 kfree(dmah);
101 return NULL;
102 }
103#endif
104
105 memset(dmah->vaddr, 0, size);
106
107 return dmah;
108}
109EXPORT_SYMBOL(drm_pci_alloc);
110
111/**
112 * \brief Free a PCI consistent memory block with freeing its descriptor.
113 *
114 * This function is for internal use in the Linux-specific DRM core code.
115 */
116void
117__drm_pci_free(drm_device_t * dev, drm_dma_handle_t *dmah)
118{
119#ifdef DRM_DEBUG_MEMORY
120 int area = DRM_MEM_DMA;
121 int alloc_count;
122 int free_count;
123#endif
124
125 if (!dmah->vaddr) {
126#ifdef DRM_DEBUG_MEMORY
127 DRM_MEM_ERROR(area, "Attempt to free address 0\n");
128#endif
129 } else {
130 pci_free_consistent(dev->pdev, dmah->size, dmah->vaddr,
131 dmah->busaddr);
132 }
133
134#ifdef DRM_DEBUG_MEMORY
135 spin_lock(&drm_mem_lock);
136 free_count = ++drm_mem_stats[area].free_count;
137 alloc_count = drm_mem_stats[area].succeed_count;
138 drm_mem_stats[area].bytes_freed += size;
139 drm_ram_used -= size;
140 spin_unlock(&drm_mem_lock);
141 if (free_count > alloc_count) {
142 DRM_MEM_ERROR(area,
143 "Excess frees: %d frees, %d allocs\n",
144 free_count, alloc_count);
145 }
146#endif
147
148}
149
150/**
151 * \brief Free a PCI consistent memory block
152 */
153void
154drm_pci_free(drm_device_t *dev, drm_dma_handle_t *dmah)
155{
156 __drm_pci_free(dev, dmah);
157 kfree(dmah);
158}
159EXPORT_SYMBOL(drm_pci_free);
160
161/*@}*/