1 /* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-c -*- */
4 * \brief Functions and ioctls to manage PCI memory
6 * \warning These interfaces aren't stable yet.
8 * \todo Implement the remaining ioctl's for the PCI pools.
9 * \todo Add support to map these buffers.
10 * \todo The wrappers here are so thin that they would be better off inlined..
12 * \author Jos�Fonseca <jrfonseca@tungstengraphics.com>
13 * \author Leif Delgass <ldelgass@retinalburn.net>
17 * Copyright 2003 Jos�Fonseca.
18 * Copyright 2003 Leif Delgass.
19 * All Rights Reserved.
21 * Permission is hereby granted, free of charge, to any person obtaining a
22 * copy of this software and associated documentation files (the "Software"),
23 * to deal in the Software without restriction, including without limitation
24 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
25 * and/or sell copies of the Software, and to permit persons to whom the
26 * Software is furnished to do so, subject to the following conditions:
28 * The above copyright notice and this permission notice (including the next
29 * paragraph) shall be included in all copies or substantial portions of the
32 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
33 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
34 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
35 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
36 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
41 #include <linux/pci.h>
44 /**********************************************************************/
45 /** \name PCI memory */
50 * \brief Allocate a PCI consistent memory block, for DMA.
53 drm_pci_alloc(drm_device_t *dev, size_t size, size_t align,
54 dma_addr_t maxaddr, dma_addr_t *busaddr)
62 int area = DRM_MEM_DMA;
64 spin_lock(&drm_mem_lock);
65 if ((drm_ram_used >> PAGE_SHIFT)
66 > (DRM_RAM_PERCENT * drm_ram_available) / 100) {
67 spin_unlock(&drm_mem_lock);
70 spin_unlock(&drm_mem_lock);
73 /* pci_alloc_consistent only guarantees alignment to the smallest
74 * PAGE_SIZE order which is greater than or equal to the requested size.
75 * Return NULL here for now to make sure nobody tries for larger alignment
80 if (pci_set_dma_mask( dev->pdev, maxaddr ) != 0) {
81 DRM_ERROR( "Setting pci dma mask failed\n" );
85 address = pci_alloc_consistent( dev->pdev, size, busaddr );
88 if (address == NULL) {
89 spin_lock(&drm_mem_lock);
90 ++drm_mem_stats[area].fail_count;
91 spin_unlock(&drm_mem_lock);
95 spin_lock(&drm_mem_lock);
96 ++drm_mem_stats[area].succeed_count;
97 drm_mem_stats[area].bytes_allocated += size;
99 spin_unlock(&drm_mem_lock);
105 memset(address, 0, size);
108 /* XXX - Is virt_to_page() legal for consistent mem? */
110 for (addr = (unsigned long)address, sz = size;
112 addr += PAGE_SIZE, sz -= PAGE_SIZE) {
113 SetPageReserved(virt_to_page(addr));
119 EXPORT_SYMBOL(drm_pci_alloc);
122 * \brief Free a PCI consistent memory block.
125 drm_pci_free(drm_device_t *dev, size_t size, void *vaddr, dma_addr_t busaddr)
132 int area = DRM_MEM_DMA;
139 DRM_MEM_ERROR(area, "Attempt to free address 0\n");
143 /* XXX - Is virt_to_page() legal for consistent mem? */
145 for (addr = (unsigned long)vaddr, sz = size;
147 addr += PAGE_SIZE, sz -= PAGE_SIZE) {
148 ClearPageReserved(virt_to_page(addr));
151 pci_free_consistent( dev->pdev, size, vaddr, busaddr );
155 spin_lock(&drm_mem_lock);
156 free_count = ++drm_mem_stats[area].free_count;
157 alloc_count = drm_mem_stats[area].succeed_count;
158 drm_mem_stats[area].bytes_freed += size;
159 drm_ram_used -= size;
160 spin_unlock(&drm_mem_lock);
161 if (free_count > alloc_count) {
163 "Excess frees: %d frees, %d allocs\n",
164 free_count, alloc_count);
169 EXPORT_SYMBOL(drm_pci_free);