blob: b55d5bc6ea612922209ff9236b75789762697515 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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 *
Jan Engelhardt96de0e22007-10-19 23:21:04 +020011 * \author José Fonseca <jrfonseca@tungstengraphics.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * \author Leif Delgass <ldelgass@retinalburn.net>
13 */
14
15/*
Jan Engelhardt96de0e22007-10-19 23:21:04 +020016 * Copyright 2003 José Fonseca.
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 * 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>
Dave Airlie195b3a22006-04-05 18:12:18 +100040#include <linux/dma-mapping.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include "drmP.h"
42
43/**********************************************************************/
44/** \name PCI memory */
45/*@{*/
46
47/**
48 * \brief Allocate a PCI consistent memory block, for DMA.
49 */
Dave Airlie84b1fd12007-07-11 15:53:27 +100050drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align,
Dave Airlie9c8da5e2005-07-10 15:38:56 +100051 dma_addr_t maxaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070052{
Dave Airlie9c8da5e2005-07-10 15:38:56 +100053 drm_dma_handle_t *dmah;
Dave Airlieddf19b92006-03-19 18:56:12 +110054#if 1
55 unsigned long addr;
56 size_t sz;
57#endif
Dave Airlieaa0ca6b2005-08-05 23:09:14 +100058#ifdef DRM_DEBUG_MEMORY
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 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
Dave Airlie9c8da5e2005-07-10 15:38:56 +100082 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
83 if (!dmah)
84 return NULL;
Dave Airlieb5e89ed2005-09-25 14:28:13 +100085
Dave Airlie9c8da5e2005-07-10 15:38:56 +100086 dmah->size = size;
Dave Airlieddf19b92006-03-19 18:56:12 +110087 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Dave Airlieaa0ca6b2005-08-05 23:09:14 +100089#ifdef DRM_DEBUG_MEMORY
Dave Airlie9c8da5e2005-07-10 15:38:56 +100090 if (dmah->vaddr == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 spin_lock(&drm_mem_lock);
92 ++drm_mem_stats[area].fail_count;
93 spin_unlock(&drm_mem_lock);
Dave Airlie9c8da5e2005-07-10 15:38:56 +100094 kfree(dmah);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 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
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000104 if (dmah->vaddr == NULL) {
105 kfree(dmah);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 return NULL;
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000107 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108#endif
109
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000110 memset(dmah->vaddr, 0, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Dave Airlieddf19b92006-03-19 18:56:12 +1100112 /* 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
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000119 return dmah;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122EXPORT_SYMBOL(drm_pci_alloc);
123
124/**
Dave Airlieddf19b92006-03-19 18:56:12 +1100125 * \brief Free a PCI consistent memory block without freeing its descriptor.
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000126 *
127 * This function is for internal use in the Linux-specific DRM core code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 */
Dave Airlie84b1fd12007-07-11 15:53:27 +1000129void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
Dave Airlieddf19b92006-03-19 18:56:12 +1100131#if 1
132 unsigned long addr;
133 size_t sz;
134#endif
Dave Airlieaa0ca6b2005-08-05 23:09:14 +1000135#ifdef DRM_DEBUG_MEMORY
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 int area = DRM_MEM_DMA;
137 int alloc_count;
138 int free_count;
139#endif
140
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000141 if (!dmah->vaddr) {
Dave Airlieaa0ca6b2005-08-05 23:09:14 +1000142#ifdef DRM_DEBUG_MEMORY
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 DRM_MEM_ERROR(area, "Attempt to free address 0\n");
144#endif
145 } else {
Dave Airlieddf19b92006-03-19 18:56:12 +1100146 /* 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 }
155
Dave Airlieaa0ca6b2005-08-05 23:09:14 +1000156#ifdef DRM_DEBUG_MEMORY
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 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}
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000171
172/**
173 * \brief Free a PCI consistent memory block
174 */
Dave Airlie84b1fd12007-07-11 15:53:27 +1000175void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000176{
177 __drm_pci_free(dev, dmah);
178 kfree(dmah);
179}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181EXPORT_SYMBOL(drm_pci_free);
182
183/*@}*/