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 José Fonseca <jrfonseca@tungstengraphics.com>
12 * \author Leif Delgass <ldelgass@retinalburn.net>
13 */
14
15 /*
16 * Copyright 2003 José 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 <linux/dma-mapping.h>
41 #include "drmP.h"
42
43 /**********************************************************************/
44 /** \name PCI memory */
45 /*@{*/
46
47 /**
48 * \brief Allocate a PCI consistent memory block, for DMA.
49 */
50 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align,
51 dma_addr_t maxaddr)
52 {
53 drm_dma_handle_t *dmah;
54 #if 1
55 unsigned long addr;
56 size_t sz;
57 #endif
58 #ifdef DRM_DEBUG_MEMORY
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
82 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
83 if (!dmah)
84 return NULL;
85
86 dmah->size = size;
87 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP);
88
89 #ifdef DRM_DEBUG_MEMORY
90 if (dmah->vaddr == NULL) {
91 spin_lock(&drm_mem_lock);
92 ++drm_mem_stats[area].fail_count;
93 spin_unlock(&drm_mem_lock);
94 kfree(dmah);
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
104 if (dmah->vaddr == NULL) {
105 kfree(dmah);
106 return NULL;
107 }
108 #endif
109
110 memset(dmah->vaddr, 0, size);
111
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
119 return dmah;
120 }
121
122 EXPORT_SYMBOL(drm_pci_alloc);
123
124 /**
125 * \brief Free a PCI consistent memory block without freeing its descriptor.
126 *
127 * This function is for internal use in the Linux-specific DRM core code.
128 */
129 void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
130 {
131 #if 1
132 unsigned long addr;
133 size_t sz;
134 #endif
135 #ifdef DRM_DEBUG_MEMORY
136 int area = DRM_MEM_DMA;
137 int alloc_count;
138 int free_count;
139 #endif
140
141 if (!dmah->vaddr) {
142 #ifdef DRM_DEBUG_MEMORY
143 DRM_MEM_ERROR(area, "Attempt to free address 0\n");
144 #endif
145 } else {
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);
154 }
155
156 #ifdef DRM_DEBUG_MEMORY
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 }
171
172 /**
173 * \brief Free a PCI consistent memory block
174 */
175 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
176 {
177 __drm_pci_free(dev, dmah);
178 kfree(dmah);
179 }
180
181 EXPORT_SYMBOL(drm_pci_free);
182
183 /*@}*/
184
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