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 The wrappers here are so thin that they would be better off inlined..
11 * \author Jose Fonseca <jrfonseca@tungstengraphics.com>
12 * \author Leif Delgass <ldelgass@retinalburn.net>
16 * Copyright 2003 Jos�Fonseca.
17 * Copyright 2003 Leif Delgass.
18 * All Rights Reserved.
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:
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
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.
39 #include <linux/pci.h>
42 /**********************************************************************/
43 /** \name PCI memory */
47 * \brief Allocate a PCI consistent memory block, for DMA.
49 drm_dma_handle_t *drm_pci_alloc(drm_device_t * dev, size_t size, size_t align,
52 drm_dma_handle_t *dmah;
58 int area = DRM_MEM_DMA;
60 spin_lock(&drm_mem_lock);
61 if ((drm_ram_used >> PAGE_SHIFT)
62 > (DRM_RAM_PERCENT * drm_ram_available) / 100) {
63 spin_unlock(&drm_mem_lock);
66 spin_unlock(&drm_mem_lock);
69 /* pci_alloc_consistent only guarantees alignment to the smallest
70 * PAGE_SIZE order which is greater than or equal to the requested size.
71 * Return NULL here for now to make sure nobody tries for larger alignment
76 if (pci_set_dma_mask(dev->pdev, maxaddr) != 0) {
77 DRM_ERROR("Setting pci dma mask failed\n");
81 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
85 dmah->vaddr = pci_alloc_consistent(dev->pdev, size, &dmah->busaddr);
88 if (dmah->vaddr == NULL) {
89 spin_lock(&drm_mem_lock);
90 ++drm_mem_stats[area].fail_count;
91 spin_unlock(&drm_mem_lock);
96 spin_lock(&drm_mem_lock);
97 ++drm_mem_stats[area].succeed_count;
98 drm_mem_stats[area].bytes_allocated += size;
100 spin_unlock(&drm_mem_lock);
102 if (dmah->vaddr == NULL) {
108 memset(dmah->vaddr, 0, size);
111 /* XXX - Is virt_to_page() legal for consistent mem? */
113 for (addr = (unsigned long)dmah->vaddr, sz = size;
114 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
115 SetPageReserved(virt_to_page(addr));
121 EXPORT_SYMBOL(drm_pci_alloc);
124 * \brief Free a PCI consistent memory block.
127 drm_pci_free(drm_device_t * dev, drm_dma_handle_t *dmah)
134 int area = DRM_MEM_DMA;
141 DRM_MEM_ERROR(area, "Attempt to free address 0\n");
145 /* XXX - Is virt_to_page() legal for consistent mem? */
147 for (addr = (unsigned long)dmah->vaddr, sz = size;
148 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
149 ClearPageReserved(virt_to_page(addr));
152 pci_free_consistent(dev->pdev, dmah->size, dmah->vaddr,
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) {
165 "Excess frees: %d frees, %d allocs\n",
166 free_count, alloc_count);
171 EXPORT_SYMBOL(drm_pci_free);