drm/radeon/kms: clear confusion in GART init/deinit path
[linux-2.6.git] / drivers / gpu / drm / radeon / radeon_gart.c
1 /*
2  * Copyright 2008 Advanced Micro Devices, Inc.
3  * Copyright 2008 Red Hat Inc.
4  * Copyright 2009 Jerome Glisse.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the "Software"),
8  * to deal in the Software without restriction, including without limitation
9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10  * and/or sell copies of the Software, and to permit persons to whom the
11  * Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22  * OTHER DEALINGS IN THE SOFTWARE.
23  *
24  * Authors: Dave Airlie
25  *          Alex Deucher
26  *          Jerome Glisse
27  */
28 #include "drmP.h"
29 #include "radeon_drm.h"
30 #include "radeon.h"
31 #include "radeon_reg.h"
32
33 /*
34  * Common GART table functions.
35  */
36 int radeon_gart_table_ram_alloc(struct radeon_device *rdev)
37 {
38         void *ptr;
39
40         ptr = pci_alloc_consistent(rdev->pdev, rdev->gart.table_size,
41                                    &rdev->gart.table_addr);
42         if (ptr == NULL) {
43                 return -ENOMEM;
44         }
45 #ifdef CONFIG_X86
46         if (rdev->family == CHIP_RS400 || rdev->family == CHIP_RS480 ||
47             rdev->family == CHIP_RS690 || rdev->family == CHIP_RS740) {
48                 set_memory_uc((unsigned long)ptr,
49                               rdev->gart.table_size >> PAGE_SHIFT);
50         }
51 #endif
52         rdev->gart.table.ram.ptr = ptr;
53         memset((void *)rdev->gart.table.ram.ptr, 0, rdev->gart.table_size);
54         return 0;
55 }
56
57 void radeon_gart_table_ram_free(struct radeon_device *rdev)
58 {
59         if (rdev->gart.table.ram.ptr == NULL) {
60                 return;
61         }
62 #ifdef CONFIG_X86
63         if (rdev->family == CHIP_RS400 || rdev->family == CHIP_RS480 ||
64             rdev->family == CHIP_RS690 || rdev->family == CHIP_RS740) {
65                 set_memory_wb((unsigned long)rdev->gart.table.ram.ptr,
66                               rdev->gart.table_size >> PAGE_SHIFT);
67         }
68 #endif
69         pci_free_consistent(rdev->pdev, rdev->gart.table_size,
70                             (void *)rdev->gart.table.ram.ptr,
71                             rdev->gart.table_addr);
72         rdev->gart.table.ram.ptr = NULL;
73         rdev->gart.table_addr = 0;
74 }
75
76 int radeon_gart_table_vram_alloc(struct radeon_device *rdev)
77 {
78         int r;
79
80         if (rdev->gart.table.vram.robj == NULL) {
81                 r = radeon_object_create(rdev, NULL,
82                                          rdev->gart.table_size,
83                                          true,
84                                          RADEON_GEM_DOMAIN_VRAM,
85                                          false, &rdev->gart.table.vram.robj);
86                 if (r) {
87                         return r;
88                 }
89         }
90         return 0;
91 }
92
93 int radeon_gart_table_vram_pin(struct radeon_device *rdev)
94 {
95         uint64_t gpu_addr;
96         int r;
97
98         r = radeon_object_pin(rdev->gart.table.vram.robj,
99                               RADEON_GEM_DOMAIN_VRAM, &gpu_addr);
100         if (r) {
101                 radeon_object_unref(&rdev->gart.table.vram.robj);
102                 return r;
103         }
104         r = radeon_object_kmap(rdev->gart.table.vram.robj,
105                                (void **)&rdev->gart.table.vram.ptr);
106         if (r) {
107                 radeon_object_unpin(rdev->gart.table.vram.robj);
108                 radeon_object_unref(&rdev->gart.table.vram.robj);
109                 DRM_ERROR("radeon: failed to map gart vram table.\n");
110                 return r;
111         }
112         rdev->gart.table_addr = gpu_addr;
113         return 0;
114 }
115
116 void radeon_gart_table_vram_free(struct radeon_device *rdev)
117 {
118         if (rdev->gart.table.vram.robj == NULL) {
119                 return;
120         }
121         radeon_object_kunmap(rdev->gart.table.vram.robj);
122         radeon_object_unpin(rdev->gart.table.vram.robj);
123         radeon_object_unref(&rdev->gart.table.vram.robj);
124 }
125
126
127
128
129 /*
130  * Common gart functions.
131  */
132 void radeon_gart_unbind(struct radeon_device *rdev, unsigned offset,
133                         int pages)
134 {
135         unsigned t;
136         unsigned p;
137         int i, j;
138
139         if (!rdev->gart.ready) {
140                 WARN(1, "trying to unbind memory to unitialized GART !\n");
141                 return;
142         }
143         t = offset / 4096;
144         p = t / (PAGE_SIZE / 4096);
145         for (i = 0; i < pages; i++, p++) {
146                 if (rdev->gart.pages[p]) {
147                         pci_unmap_page(rdev->pdev, rdev->gart.pages_addr[p],
148                                        PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
149                         rdev->gart.pages[p] = NULL;
150                         rdev->gart.pages_addr[p] = 0;
151                         for (j = 0; j < (PAGE_SIZE / 4096); j++, t++) {
152                                 radeon_gart_set_page(rdev, t, 0);
153                         }
154                 }
155         }
156         mb();
157         radeon_gart_tlb_flush(rdev);
158 }
159
160 int radeon_gart_bind(struct radeon_device *rdev, unsigned offset,
161                      int pages, struct page **pagelist)
162 {
163         unsigned t;
164         unsigned p;
165         uint64_t page_base;
166         int i, j;
167
168         if (!rdev->gart.ready) {
169                 DRM_ERROR("trying to bind memory to unitialized GART !\n");
170                 return -EINVAL;
171         }
172         t = offset / 4096;
173         p = t / (PAGE_SIZE / 4096);
174
175         for (i = 0; i < pages; i++, p++) {
176                 /* we need to support large memory configurations */
177                 /* assume that unbind have already been call on the range */
178                 rdev->gart.pages_addr[p] = pci_map_page(rdev->pdev, pagelist[i],
179                                                         0, PAGE_SIZE,
180                                                         PCI_DMA_BIDIRECTIONAL);
181                 if (pci_dma_mapping_error(rdev->pdev, rdev->gart.pages_addr[p])) {
182                         /* FIXME: failed to map page (return -ENOMEM?) */
183                         radeon_gart_unbind(rdev, offset, pages);
184                         return -ENOMEM;
185                 }
186                 rdev->gart.pages[p] = pagelist[i];
187                 page_base = rdev->gart.pages_addr[p];
188                 for (j = 0; j < (PAGE_SIZE / 4096); j++, t++) {
189                         radeon_gart_set_page(rdev, t, page_base);
190                         page_base += 4096;
191                 }
192         }
193         mb();
194         radeon_gart_tlb_flush(rdev);
195         return 0;
196 }
197
198 int radeon_gart_init(struct radeon_device *rdev)
199 {
200         if (rdev->gart.pages) {
201                 return 0;
202         }
203         /* We need PAGE_SIZE >= 4096 */
204         if (PAGE_SIZE < 4096) {
205                 DRM_ERROR("Page size is smaller than GPU page size!\n");
206                 return -EINVAL;
207         }
208         /* Compute table size */
209         rdev->gart.num_cpu_pages = rdev->mc.gtt_size / PAGE_SIZE;
210         rdev->gart.num_gpu_pages = rdev->mc.gtt_size / 4096;
211         DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n",
212                  rdev->gart.num_cpu_pages, rdev->gart.num_gpu_pages);
213         /* Allocate pages table */
214         rdev->gart.pages = kzalloc(sizeof(void *) * rdev->gart.num_cpu_pages,
215                                    GFP_KERNEL);
216         if (rdev->gart.pages == NULL) {
217                 radeon_gart_fini(rdev);
218                 return -ENOMEM;
219         }
220         rdev->gart.pages_addr = kzalloc(sizeof(dma_addr_t) *
221                                         rdev->gart.num_cpu_pages, GFP_KERNEL);
222         if (rdev->gart.pages_addr == NULL) {
223                 radeon_gart_fini(rdev);
224                 return -ENOMEM;
225         }
226         return 0;
227 }
228
229 void radeon_gart_fini(struct radeon_device *rdev)
230 {
231         if (rdev->gart.pages && rdev->gart.pages_addr && rdev->gart.ready) {
232                 /* unbind pages */
233                 radeon_gart_unbind(rdev, 0, rdev->gart.num_cpu_pages);
234         }
235         rdev->gart.ready = false;
236         kfree(rdev->gart.pages);
237         kfree(rdev->gart.pages_addr);
238         rdev->gart.pages = NULL;
239         rdev->gart.pages_addr = NULL;
240 }