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a8c21a54 T |
1 | /* |
2 | * Copyright (C) 2014 Christian Gmeiner <christian.gmeiner@gmail.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License version 2 as published by | |
6 | * the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | */ | |
16 | ||
17 | #include <linux/iommu.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/sizes.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/dma-mapping.h> | |
22 | #include <linux/bitops.h> | |
23 | ||
24 | #include "etnaviv_gpu.h" | |
25 | #include "etnaviv_mmu.h" | |
26 | #include "etnaviv_iommu.h" | |
27 | #include "state_hi.xml.h" | |
28 | ||
29 | #define PT_SIZE SZ_2M | |
30 | #define PT_ENTRIES (PT_SIZE / sizeof(u32)) | |
31 | ||
32 | #define GPU_MEM_START 0x80000000 | |
33 | ||
34 | struct etnaviv_iommu_domain_pgtable { | |
35 | u32 *pgtable; | |
36 | dma_addr_t paddr; | |
37 | }; | |
38 | ||
39 | struct etnaviv_iommu_domain { | |
40 | struct iommu_domain domain; | |
41 | struct device *dev; | |
42 | void *bad_page_cpu; | |
43 | dma_addr_t bad_page_dma; | |
44 | struct etnaviv_iommu_domain_pgtable pgtable; | |
45 | spinlock_t map_lock; | |
46 | }; | |
47 | ||
48 | static struct etnaviv_iommu_domain *to_etnaviv_domain(struct iommu_domain *domain) | |
49 | { | |
50 | return container_of(domain, struct etnaviv_iommu_domain, domain); | |
51 | } | |
52 | ||
53 | static int pgtable_alloc(struct etnaviv_iommu_domain_pgtable *pgtable, | |
54 | size_t size) | |
55 | { | |
56 | pgtable->pgtable = dma_alloc_coherent(NULL, size, &pgtable->paddr, GFP_KERNEL); | |
57 | if (!pgtable->pgtable) | |
58 | return -ENOMEM; | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
63 | static void pgtable_free(struct etnaviv_iommu_domain_pgtable *pgtable, | |
64 | size_t size) | |
65 | { | |
66 | dma_free_coherent(NULL, size, pgtable->pgtable, pgtable->paddr); | |
67 | } | |
68 | ||
69 | static u32 pgtable_read(struct etnaviv_iommu_domain_pgtable *pgtable, | |
70 | unsigned long iova) | |
71 | { | |
72 | /* calcuate index into page table */ | |
73 | unsigned int index = (iova - GPU_MEM_START) / SZ_4K; | |
74 | phys_addr_t paddr; | |
75 | ||
76 | paddr = pgtable->pgtable[index]; | |
77 | ||
78 | return paddr; | |
79 | } | |
80 | ||
81 | static void pgtable_write(struct etnaviv_iommu_domain_pgtable *pgtable, | |
82 | unsigned long iova, phys_addr_t paddr) | |
83 | { | |
84 | /* calcuate index into page table */ | |
85 | unsigned int index = (iova - GPU_MEM_START) / SZ_4K; | |
86 | ||
87 | pgtable->pgtable[index] = paddr; | |
88 | } | |
89 | ||
90 | static int __etnaviv_iommu_init(struct etnaviv_iommu_domain *etnaviv_domain) | |
91 | { | |
92 | u32 *p; | |
93 | int ret, i; | |
94 | ||
95 | etnaviv_domain->bad_page_cpu = dma_alloc_coherent(etnaviv_domain->dev, | |
96 | SZ_4K, | |
97 | &etnaviv_domain->bad_page_dma, | |
98 | GFP_KERNEL); | |
99 | if (!etnaviv_domain->bad_page_cpu) | |
100 | return -ENOMEM; | |
101 | ||
102 | p = etnaviv_domain->bad_page_cpu; | |
103 | for (i = 0; i < SZ_4K / 4; i++) | |
104 | *p++ = 0xdead55aa; | |
105 | ||
106 | ret = pgtable_alloc(&etnaviv_domain->pgtable, PT_SIZE); | |
107 | if (ret < 0) { | |
108 | dma_free_coherent(etnaviv_domain->dev, SZ_4K, | |
109 | etnaviv_domain->bad_page_cpu, | |
110 | etnaviv_domain->bad_page_dma); | |
111 | return ret; | |
112 | } | |
113 | ||
114 | for (i = 0; i < PT_ENTRIES; i++) | |
115 | etnaviv_domain->pgtable.pgtable[i] = | |
116 | etnaviv_domain->bad_page_dma; | |
117 | ||
118 | spin_lock_init(&etnaviv_domain->map_lock); | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | static void etnaviv_domain_free(struct iommu_domain *domain) | |
124 | { | |
125 | struct etnaviv_iommu_domain *etnaviv_domain = to_etnaviv_domain(domain); | |
126 | ||
127 | pgtable_free(&etnaviv_domain->pgtable, PT_SIZE); | |
128 | ||
129 | dma_free_coherent(etnaviv_domain->dev, SZ_4K, | |
130 | etnaviv_domain->bad_page_cpu, | |
131 | etnaviv_domain->bad_page_dma); | |
132 | ||
133 | kfree(etnaviv_domain); | |
134 | } | |
135 | ||
136 | static int etnaviv_iommuv1_map(struct iommu_domain *domain, unsigned long iova, | |
137 | phys_addr_t paddr, size_t size, int prot) | |
138 | { | |
139 | struct etnaviv_iommu_domain *etnaviv_domain = to_etnaviv_domain(domain); | |
140 | ||
141 | if (size != SZ_4K) | |
142 | return -EINVAL; | |
143 | ||
144 | spin_lock(&etnaviv_domain->map_lock); | |
145 | pgtable_write(&etnaviv_domain->pgtable, iova, paddr); | |
146 | spin_unlock(&etnaviv_domain->map_lock); | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
151 | static size_t etnaviv_iommuv1_unmap(struct iommu_domain *domain, | |
152 | unsigned long iova, size_t size) | |
153 | { | |
154 | struct etnaviv_iommu_domain *etnaviv_domain = to_etnaviv_domain(domain); | |
155 | ||
156 | if (size != SZ_4K) | |
157 | return -EINVAL; | |
158 | ||
159 | spin_lock(&etnaviv_domain->map_lock); | |
160 | pgtable_write(&etnaviv_domain->pgtable, iova, | |
161 | etnaviv_domain->bad_page_dma); | |
162 | spin_unlock(&etnaviv_domain->map_lock); | |
163 | ||
164 | return SZ_4K; | |
165 | } | |
166 | ||
167 | static phys_addr_t etnaviv_iommu_iova_to_phys(struct iommu_domain *domain, | |
168 | dma_addr_t iova) | |
169 | { | |
170 | struct etnaviv_iommu_domain *etnaviv_domain = to_etnaviv_domain(domain); | |
171 | ||
172 | return pgtable_read(&etnaviv_domain->pgtable, iova); | |
173 | } | |
174 | ||
175 | static size_t etnaviv_iommuv1_dump_size(struct iommu_domain *domain) | |
176 | { | |
177 | return PT_SIZE; | |
178 | } | |
179 | ||
180 | static void etnaviv_iommuv1_dump(struct iommu_domain *domain, void *buf) | |
181 | { | |
182 | struct etnaviv_iommu_domain *etnaviv_domain = to_etnaviv_domain(domain); | |
183 | ||
184 | memcpy(buf, etnaviv_domain->pgtable.pgtable, PT_SIZE); | |
185 | } | |
186 | ||
187 | static struct etnaviv_iommu_ops etnaviv_iommu_ops = { | |
188 | .ops = { | |
189 | .domain_free = etnaviv_domain_free, | |
190 | .map = etnaviv_iommuv1_map, | |
191 | .unmap = etnaviv_iommuv1_unmap, | |
192 | .iova_to_phys = etnaviv_iommu_iova_to_phys, | |
193 | .pgsize_bitmap = SZ_4K, | |
194 | }, | |
195 | .dump_size = etnaviv_iommuv1_dump_size, | |
196 | .dump = etnaviv_iommuv1_dump, | |
197 | }; | |
198 | ||
199 | void etnaviv_iommu_domain_restore(struct etnaviv_gpu *gpu, | |
200 | struct iommu_domain *domain) | |
201 | { | |
202 | struct etnaviv_iommu_domain *etnaviv_domain = to_etnaviv_domain(domain); | |
203 | u32 pgtable; | |
204 | ||
205 | /* set page table address in MC */ | |
206 | pgtable = (u32)etnaviv_domain->pgtable.paddr; | |
207 | ||
208 | gpu_write(gpu, VIVS_MC_MMU_FE_PAGE_TABLE, pgtable); | |
209 | gpu_write(gpu, VIVS_MC_MMU_TX_PAGE_TABLE, pgtable); | |
210 | gpu_write(gpu, VIVS_MC_MMU_PE_PAGE_TABLE, pgtable); | |
211 | gpu_write(gpu, VIVS_MC_MMU_PEZ_PAGE_TABLE, pgtable); | |
212 | gpu_write(gpu, VIVS_MC_MMU_RA_PAGE_TABLE, pgtable); | |
213 | } | |
214 | ||
215 | struct iommu_domain *etnaviv_iommu_domain_alloc(struct etnaviv_gpu *gpu) | |
216 | { | |
217 | struct etnaviv_iommu_domain *etnaviv_domain; | |
218 | int ret; | |
219 | ||
220 | etnaviv_domain = kzalloc(sizeof(*etnaviv_domain), GFP_KERNEL); | |
221 | if (!etnaviv_domain) | |
222 | return NULL; | |
223 | ||
224 | etnaviv_domain->dev = gpu->dev; | |
225 | ||
226 | etnaviv_domain->domain.type = __IOMMU_DOMAIN_PAGING; | |
227 | etnaviv_domain->domain.ops = &etnaviv_iommu_ops.ops; | |
13c34fe5 | 228 | etnaviv_domain->domain.pgsize_bitmap = SZ_4K; |
a8c21a54 T |
229 | etnaviv_domain->domain.geometry.aperture_start = GPU_MEM_START; |
230 | etnaviv_domain->domain.geometry.aperture_end = GPU_MEM_START + PT_ENTRIES * SZ_4K - 1; | |
231 | ||
232 | ret = __etnaviv_iommu_init(etnaviv_domain); | |
233 | if (ret) | |
234 | goto out_free; | |
235 | ||
236 | return &etnaviv_domain->domain; | |
237 | ||
238 | out_free: | |
239 | kfree(etnaviv_domain); | |
240 | return NULL; | |
241 | } |