blob: 275bca44f38c2fa118fb2ac78530ef08e0f523f0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/**
Dave Airlieb5e89ed2005-09-25 14:28:13 +10002 * \file drm_scatter.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * IOCTLs to manage scatter/gather memory
4 *
5 * \author Gareth Hughes <gareth@valinux.com>
6 */
7
8/*
9 * Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com
10 *
11 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
12 * All Rights Reserved.
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a
15 * copy of this software and associated documentation files (the "Software"),
16 * to deal in the Software without restriction, including without limitation
17 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
18 * and/or sell copies of the Software, and to permit persons to whom the
19 * Software is furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice (including the next
22 * paragraph) shall be included in all copies or substantial portions of the
23 * Software.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
28 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
29 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
30 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
31 * DEALINGS IN THE SOFTWARE.
32 */
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/vmalloc.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090035#include <linux/slab.h>
David Howells760285e2012-10-02 18:01:07 +010036#include <drm/drmP.h>
Daniel Vetter9ec4e2f2014-09-11 07:42:43 +020037#include "drm_legacy.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#define DEBUG_SCATTER 0
40
Benjamin Herrenschmidt6876b3b2008-03-28 14:23:07 -070041static inline void *drm_vmalloc_dma(unsigned long size)
42{
43#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
Benjamin Herrenschmidt37035e72016-06-27 19:00:23 +100044 return __vmalloc(size, GFP_KERNEL, pgprot_noncached_wc(PAGE_KERNEL));
Benjamin Herrenschmidt6876b3b2008-03-28 14:23:07 -070045#else
46 return vmalloc_32(size);
47#endif
48}
49
Daniel Vetter3d914e82013-08-08 15:41:17 +020050static void drm_sg_cleanup(struct drm_sg_mem * entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -070051{
52 struct page *page;
53 int i;
54
Dave Airlieb5e89ed2005-09-25 14:28:13 +100055 for (i = 0; i < entry->pages; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 page = entry->pagelist[i];
Dave Airlieb5e89ed2005-09-25 14:28:13 +100057 if (page)
58 ClearPageReserved(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 }
60
Dave Airlieb5e89ed2005-09-25 14:28:13 +100061 vfree(entry->virtual);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Eric Anholt9a298b22009-03-24 12:23:04 -070063 kfree(entry->busaddr);
64 kfree(entry->pagelist);
65 kfree(entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066}
67
Daniel Vetter3d914e82013-08-08 15:41:17 +020068void drm_legacy_sg_cleanup(struct drm_device *dev)
69{
70 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg &&
Daniel Vetterfa538642016-08-03 21:11:10 +020071 drm_core_check_feature(dev, DRIVER_LEGACY)) {
Daniel Vetter3d914e82013-08-08 15:41:17 +020072 drm_sg_cleanup(dev->sg);
73 dev->sg = NULL;
74 }
75}
Dave Airlied1f2b552005-08-05 22:11:22 +100076#ifdef _LP64
77# define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1)))
78#else
79# define ScatterHandle(x) (unsigned int)(x)
80#endif
81
Daniel Vetter9ec4e2f2014-09-11 07:42:43 +020082int drm_legacy_sg_alloc(struct drm_device *dev, void *data,
83 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084{
Daniel Vetter1d8d29c2013-07-10 14:11:50 +020085 struct drm_scatter_gather *request = data;
Dave Airlie55910512007-07-11 16:53:40 +100086 struct drm_sg_mem *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 unsigned long pages, i, j;
88
Márton Németh3e684ea2008-01-24 15:58:57 +100089 DRM_DEBUG("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Daniel Vetterfa538642016-08-03 21:11:10 +020091 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
Daniel Vetter8e194bb2013-08-08 15:41:18 +020092 return -EINVAL;
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 if (!drm_core_check_feature(dev, DRIVER_SG))
95 return -EINVAL;
96
Dave Airlieb5e89ed2005-09-25 14:28:13 +100097 if (dev->sg)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 return -EINVAL;
99
Rakib Mullickf35119d2011-07-25 17:12:56 -0700100 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000101 if (!entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 return -ENOMEM;
103
Eric Anholtc153f452007-09-03 12:06:45 +1000104 pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
Márton Németh3e684ea2008-01-24 15:58:57 +1000105 DRM_DEBUG("size=%ld pages=%ld\n", request->size, pages);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
107 entry->pages = pages;
Rakib Mullickf35119d2011-07-25 17:12:56 -0700108 entry->pagelist = kcalloc(pages, sizeof(*entry->pagelist), GFP_KERNEL);
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000109 if (!entry->pagelist) {
Eric Anholt9a298b22009-03-24 12:23:04 -0700110 kfree(entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 return -ENOMEM;
112 }
113
Rakib Mullickf35119d2011-07-25 17:12:56 -0700114 entry->busaddr = kcalloc(pages, sizeof(*entry->busaddr), GFP_KERNEL);
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000115 if (!entry->busaddr) {
Eric Anholt9a298b22009-03-24 12:23:04 -0700116 kfree(entry->pagelist);
117 kfree(entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 return -ENOMEM;
119 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Benjamin Herrenschmidt6876b3b2008-03-28 14:23:07 -0700121 entry->virtual = drm_vmalloc_dma(pages << PAGE_SHIFT);
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000122 if (!entry->virtual) {
Eric Anholt9a298b22009-03-24 12:23:04 -0700123 kfree(entry->busaddr);
124 kfree(entry->pagelist);
125 kfree(entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 return -ENOMEM;
127 }
128
129 /* This also forces the mapping of COW pages, so our page list
130 * will be valid. Please don't remove it...
131 */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000132 memset(entry->virtual, 0, pages << PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Dave Airlied1f2b552005-08-05 22:11:22 +1000134 entry->handle = ScatterHandle((unsigned long)entry->virtual);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Márton Németh3e684ea2008-01-24 15:58:57 +1000136 DRM_DEBUG("handle = %08lx\n", entry->handle);
137 DRM_DEBUG("virtual = %p\n", entry->virtual);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000139 for (i = (unsigned long)entry->virtual, j = 0; j < pages;
140 i += PAGE_SIZE, j++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 entry->pagelist[j] = vmalloc_to_page((void *)i);
142 if (!entry->pagelist[j])
143 goto failed;
144 SetPageReserved(entry->pagelist[j]);
145 }
146
Eric Anholtc153f452007-09-03 12:06:45 +1000147 request->handle = entry->handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149 dev->sg = entry;
150
151#if DEBUG_SCATTER
152 /* Verify that each page points to its virtual address, and vice
153 * versa.
154 */
155 {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000156 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000158 for (i = 0; i < pages; i++) {
159 unsigned long *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000161 tmp = page_address(entry->pagelist[i]);
162 for (j = 0;
163 j < PAGE_SIZE / sizeof(unsigned long);
164 j++, tmp++) {
165 *tmp = 0xcafebabe;
166 }
167 tmp = (unsigned long *)((u8 *) entry->virtual +
168 (PAGE_SIZE * i));
169 for (j = 0;
170 j < PAGE_SIZE / sizeof(unsigned long);
171 j++, tmp++) {
172 if (*tmp != 0xcafebabe && error == 0) {
173 error = 1;
174 DRM_ERROR("Scatter allocation error, "
175 "pagelist does not match "
176 "virtual mapping\n");
177 }
178 }
179 tmp = page_address(entry->pagelist[i]);
180 for (j = 0;
181 j < PAGE_SIZE / sizeof(unsigned long);
182 j++, tmp++) {
183 *tmp = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 }
185 }
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000186 if (error == 0)
187 DRM_ERROR("Scatter allocation matches pagelist\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 }
189#endif
190
191 return 0;
192
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000193 failed:
194 drm_sg_cleanup(entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 return -ENOMEM;
196}
Eric Anholtc153f452007-09-03 12:06:45 +1000197
Daniel Vetter9ec4e2f2014-09-11 07:42:43 +0200198int drm_legacy_sg_free(struct drm_device *dev, void *data,
199 struct drm_file *file_priv)
Eric Anholtc153f452007-09-03 12:06:45 +1000200{
201 struct drm_scatter_gather *request = data;
Dave Airlie55910512007-07-11 16:53:40 +1000202 struct drm_sg_mem *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Daniel Vetterfa538642016-08-03 21:11:10 +0200204 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
Daniel Vetter8e194bb2013-08-08 15:41:18 +0200205 return -EINVAL;
206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 if (!drm_core_check_feature(dev, DRIVER_SG))
208 return -EINVAL;
209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 entry = dev->sg;
211 dev->sg = NULL;
212
Eric Anholtc153f452007-09-03 12:06:45 +1000213 if (!entry || entry->handle != request->handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 return -EINVAL;
215
Márton Németh3e684ea2008-01-24 15:58:57 +1000216 DRM_DEBUG("virtual = %p\n", entry->virtual);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000218 drm_sg_cleanup(entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
220 return 0;
221}