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 Jose 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.
40 #include <linux/pci.h>
43 /**********************************************************************/
44 /** \name PCI memory */
48 * \brief Allocate a PCI consistent memory block, for DMA.
50 void *drm_pci_alloc(drm_device_t * dev, size_t size, size_t align,
51 dma_addr_t maxaddr, dma_addr_t * busaddr)
59 int area = DRM_MEM_DMA;
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);
67 spin_unlock(&drm_mem_lock);
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
77 if (pci_set_dma_mask(dev->pdev, maxaddr) != 0) {
78 DRM_ERROR("Setting pci dma mask failed\n");
82 address = pci_alloc_consistent(dev->pdev, size, busaddr);
85 if (address == NULL) {
86 spin_lock(&drm_mem_lock);
87 ++drm_mem_stats[area].fail_count;
88 spin_unlock(&drm_mem_lock);
92 spin_lock(&drm_mem_lock);
93 ++drm_mem_stats[area].succeed_count;
94 drm_mem_stats[area].bytes_allocated += size;
96 spin_unlock(&drm_mem_lock);
102 memset(address, 0, size);
105 /* XXX - Is virt_to_page() legal for consistent mem? */
107 for (addr = (unsigned long)address, sz = size;
108 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
109 SetPageReserved(virt_to_page(addr));
115 EXPORT_SYMBOL(drm_pci_alloc);
118 * \brief Free a PCI consistent memory block.
121 drm_pci_free(drm_device_t * dev, size_t size, void *vaddr, dma_addr_t busaddr)
128 int area = DRM_MEM_DMA;
135 DRM_MEM_ERROR(area, "Attempt to free address 0\n");
139 /* XXX - Is virt_to_page() legal for consistent mem? */
141 for (addr = (unsigned long)vaddr, sz = size;
142 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
143 ClearPageReserved(virt_to_page(addr));
146 pci_free_consistent(dev->pdev, size, vaddr, busaddr);
150 spin_lock(&drm_mem_lock);
151 free_count = ++drm_mem_stats[area].free_count;
152 alloc_count = drm_mem_stats[area].succeed_count;
153 drm_mem_stats[area].bytes_freed += size;
154 drm_ram_used -= size;
155 spin_unlock(&drm_mem_lock);
156 if (free_count > alloc_count) {
158 "Excess frees: %d frees, %d allocs\n",
159 free_count, alloc_count);
164 EXPORT_SYMBOL(drm_pci_free);