Zhenhua Huang | 60b347d | 2018-02-26 14:35:56 +0800 | [diff] [blame] | 1 | /* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved. |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #define pr_fmt(fmt) "io-pgtable-msm-secure: " fmt |
| 14 | |
| 15 | #include <linux/iommu.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/scatterlist.h> |
| 18 | #include <linux/sizes.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/types.h> |
| 21 | #include <soc/qcom/scm.h> |
| 22 | #include <linux/dma-mapping.h> |
| 23 | #include <asm/cacheflush.h> |
| 24 | |
| 25 | #include "io-pgtable.h" |
| 26 | |
| 27 | #define IOMMU_SECURE_PTBL_SIZE 3 |
| 28 | #define IOMMU_SECURE_PTBL_INIT 4 |
| 29 | #define IOMMU_SECURE_MAP2_FLAT 0x12 |
| 30 | #define IOMMU_SECURE_UNMAP2_FLAT 0x13 |
| 31 | #define IOMMU_TLBINVAL_FLAG 0x00000001 |
| 32 | |
| 33 | #define io_pgtable_to_data(x) \ |
| 34 | container_of((x), struct msm_secure_io_pgtable, iop) |
| 35 | |
| 36 | #define io_pgtable_ops_to_pgtable(x) \ |
| 37 | container_of((x), struct io_pgtable, ops) |
| 38 | |
| 39 | #define io_pgtable_ops_to_data(x) \ |
| 40 | io_pgtable_to_data(io_pgtable_ops_to_pgtable(x)) |
| 41 | |
| 42 | struct msm_secure_io_pgtable { |
| 43 | struct io_pgtable iop; |
Charan Teja Reddy | 313991e | 2018-03-12 12:19:31 +0530 | [diff] [blame] | 44 | /* lock required while operating on page tables */ |
| 45 | struct mutex pgtbl_lock; |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 46 | }; |
| 47 | |
| 48 | int msm_iommu_sec_pgtbl_init(void) |
| 49 | { |
Ramesh Yadav Javadi | 9a59a47 | 2018-05-09 16:51:31 +0530 | [diff] [blame] | 50 | struct msm_scm_ptbl_init { |
| 51 | unsigned int paddr; |
| 52 | unsigned int size; |
| 53 | unsigned int spare; |
| 54 | } pinit = {0}; |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 55 | int psize[2] = {0, 0}; |
| 56 | unsigned int spare = 0; |
| 57 | int ret, ptbl_ret = 0; |
| 58 | struct device dev = {0}; |
| 59 | void *cpu_addr; |
| 60 | dma_addr_t paddr; |
| 61 | unsigned long attrs = 0; |
| 62 | |
Ramesh Yadav Javadi | 9a59a47 | 2018-05-09 16:51:31 +0530 | [diff] [blame] | 63 | struct scm_desc desc = {0}; |
| 64 | |
| 65 | if (!is_scm_armv8()) { |
| 66 | ret = scm_call(SCM_SVC_MP, IOMMU_SECURE_PTBL_SIZE, &spare, |
| 67 | sizeof(spare), psize, sizeof(psize)); |
| 68 | } else { |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 69 | struct scm_desc desc = {0}; |
| 70 | |
| 71 | desc.args[0] = spare; |
| 72 | desc.arginfo = SCM_ARGS(1); |
| 73 | ret = scm_call2(SCM_SIP_FNID(SCM_SVC_MP, |
| 74 | IOMMU_SECURE_PTBL_SIZE), &desc); |
| 75 | psize[0] = desc.ret[0]; |
| 76 | psize[1] = desc.ret[1]; |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 77 | } |
Ramesh Yadav Javadi | 9a59a47 | 2018-05-09 16:51:31 +0530 | [diff] [blame] | 78 | if (ret || psize[1]) { |
| 79 | pr_err("scm call IOMMU_SECURE_PTBL_SIZE failed\n"); |
| 80 | goto fail; |
| 81 | } |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 82 | /* Now allocate memory for the secure page tables */ |
| 83 | attrs = DMA_ATTR_NO_KERNEL_MAPPING; |
| 84 | dev.coherent_dma_mask = DMA_BIT_MASK(sizeof(dma_addr_t) * 8); |
Zhenhua Huang | 60b347d | 2018-02-26 14:35:56 +0800 | [diff] [blame] | 85 | arch_setup_dma_ops(&dev, 0, 0, NULL, 0); |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 86 | cpu_addr = dma_alloc_attrs(&dev, psize[0], &paddr, GFP_KERNEL, attrs); |
| 87 | if (!cpu_addr) { |
| 88 | pr_err("%s: Failed to allocate %d bytes for PTBL\n", |
| 89 | __func__, psize[0]); |
Ramesh Yadav Javadi | 9a59a47 | 2018-05-09 16:51:31 +0530 | [diff] [blame] | 90 | ret = -ENOMEM; |
| 91 | goto fail; |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 92 | } |
| 93 | |
Ramesh Yadav Javadi | 9a59a47 | 2018-05-09 16:51:31 +0530 | [diff] [blame] | 94 | pinit.paddr = (unsigned int)paddr; |
| 95 | /* paddr may be a physical address > 4GB */ |
| 96 | desc.args[0] = paddr; |
| 97 | desc.args[1] = pinit.size = psize[0]; |
| 98 | desc.args[2] = pinit.spare; |
| 99 | desc.arginfo = SCM_ARGS(3, SCM_RW, SCM_VAL, SCM_VAL); |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 100 | |
Ramesh Yadav Javadi | 9a59a47 | 2018-05-09 16:51:31 +0530 | [diff] [blame] | 101 | if (!is_scm_armv8()) { |
| 102 | ret = scm_call(SCM_SVC_MP, IOMMU_SECURE_PTBL_INIT, &pinit, |
| 103 | sizeof(pinit), &ptbl_ret, sizeof(ptbl_ret)); |
| 104 | } else { |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 105 | ret = scm_call2(SCM_SIP_FNID(SCM_SVC_MP, |
| 106 | IOMMU_SECURE_PTBL_INIT), &desc); |
| 107 | ptbl_ret = desc.ret[0]; |
Ramesh Yadav Javadi | 9a59a47 | 2018-05-09 16:51:31 +0530 | [diff] [blame] | 108 | } |
| 109 | if (ret) { |
| 110 | pr_err("scm call IOMMU_SECURE_PTBL_INIT failed\n"); |
| 111 | goto fail_mem; |
| 112 | } |
| 113 | if (ptbl_ret) { |
| 114 | pr_err("scm call IOMMU_SECURE_PTBL_INIT extended ret fail\n"); |
| 115 | goto fail_mem; |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | return 0; |
Ramesh Yadav Javadi | 9a59a47 | 2018-05-09 16:51:31 +0530 | [diff] [blame] | 119 | |
| 120 | fail_mem: |
| 121 | dma_free_attrs(&dev, psize[0], cpu_addr, paddr, attrs); |
| 122 | fail: |
| 123 | return ret; |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 124 | } |
Ramesh Yadav Javadi | 9a59a47 | 2018-05-09 16:51:31 +0530 | [diff] [blame] | 125 | |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 126 | EXPORT_SYMBOL(msm_iommu_sec_pgtbl_init); |
| 127 | |
| 128 | static int msm_secure_map(struct io_pgtable_ops *ops, unsigned long iova, |
| 129 | phys_addr_t paddr, size_t size, int iommu_prot) |
| 130 | { |
| 131 | struct msm_secure_io_pgtable *data = io_pgtable_ops_to_data(ops); |
| 132 | struct io_pgtable_cfg *cfg = &data->iop.cfg; |
| 133 | void *flush_va, *flush_va_end; |
| 134 | struct scm_desc desc = {0}; |
| 135 | int ret = -EINVAL; |
| 136 | u32 resp; |
| 137 | |
| 138 | if (!IS_ALIGNED(iova, SZ_1M) || !IS_ALIGNED(paddr, SZ_1M) || |
| 139 | !IS_ALIGNED(size, SZ_1M)) |
| 140 | return -EINVAL; |
| 141 | |
| 142 | desc.args[0] = virt_to_phys(&paddr); |
| 143 | desc.args[1] = 1; |
| 144 | desc.args[2] = size; |
| 145 | desc.args[3] = cfg->arm_msm_secure_cfg.sec_id; |
| 146 | desc.args[4] = cfg->arm_msm_secure_cfg.cbndx; |
| 147 | desc.args[5] = iova; |
| 148 | desc.args[6] = size; |
| 149 | desc.args[7] = 0; |
| 150 | |
| 151 | flush_va = &paddr; |
| 152 | flush_va_end = (void *) |
| 153 | (((unsigned long) flush_va) + sizeof(phys_addr_t)); |
| 154 | |
Charan Teja Reddy | 313991e | 2018-03-12 12:19:31 +0530 | [diff] [blame] | 155 | mutex_lock(&data->pgtbl_lock); |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 156 | /* |
| 157 | * Ensure that the buffer is in RAM by the time it gets to TZ |
| 158 | */ |
| 159 | dmac_clean_range(flush_va, flush_va_end); |
| 160 | |
| 161 | desc.arginfo = SCM_ARGS(8, SCM_RW, SCM_VAL, SCM_VAL, SCM_VAL, SCM_VAL, |
| 162 | SCM_VAL, SCM_VAL, SCM_VAL); |
| 163 | |
| 164 | if (is_scm_armv8()) { |
Charan Teja Reddy | 313991e | 2018-03-12 12:19:31 +0530 | [diff] [blame] | 165 | ret = scm_call2(SCM_SIP_FNID(SCM_SVC_MP, |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 166 | IOMMU_SECURE_MAP2_FLAT), &desc); |
| 167 | resp = desc.ret[0]; |
| 168 | } |
Charan Teja Reddy | 313991e | 2018-03-12 12:19:31 +0530 | [diff] [blame] | 169 | mutex_unlock(&data->pgtbl_lock); |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 170 | |
| 171 | if (ret || resp) |
| 172 | return -EINVAL; |
| 173 | |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | static dma_addr_t msm_secure_get_phys_addr(struct scatterlist *sg) |
| 178 | { |
| 179 | /* |
| 180 | * Try sg_dma_address first so that we can |
| 181 | * map carveout regions that do not have a |
| 182 | * struct page associated with them. |
| 183 | */ |
| 184 | dma_addr_t pa = sg_dma_address(sg); |
| 185 | |
| 186 | if (pa == 0) |
| 187 | pa = sg_phys(sg); |
| 188 | return pa; |
| 189 | } |
| 190 | |
| 191 | static int msm_secure_map_sg(struct io_pgtable_ops *ops, unsigned long iova, |
| 192 | struct scatterlist *sg, unsigned int nents, |
| 193 | int iommu_prot, size_t *size) |
| 194 | { |
| 195 | struct msm_secure_io_pgtable *data = io_pgtable_ops_to_data(ops); |
| 196 | struct io_pgtable_cfg *cfg = &data->iop.cfg; |
| 197 | int ret = -EINVAL; |
| 198 | struct scatterlist *tmp, *sgiter; |
| 199 | dma_addr_t *pa_list = 0; |
| 200 | unsigned int cnt, offset = 0, chunk_offset = 0; |
| 201 | dma_addr_t pa; |
| 202 | void *flush_va, *flush_va_end; |
| 203 | unsigned long len = 0; |
| 204 | struct scm_desc desc = {0}; |
| 205 | int i; |
| 206 | u32 resp; |
| 207 | |
| 208 | for_each_sg(sg, tmp, nents, i) |
| 209 | len += tmp->length; |
| 210 | |
| 211 | if (!IS_ALIGNED(iova, SZ_1M) || !IS_ALIGNED(len, SZ_1M)) |
| 212 | return -EINVAL; |
| 213 | |
| 214 | if (sg->length == len) { |
| 215 | cnt = 1; |
| 216 | pa = msm_secure_get_phys_addr(sg); |
| 217 | if (!IS_ALIGNED(pa, SZ_1M)) |
| 218 | return -EINVAL; |
| 219 | |
| 220 | desc.args[0] = virt_to_phys(&pa); |
| 221 | desc.args[1] = cnt; |
| 222 | desc.args[2] = len; |
| 223 | flush_va = &pa; |
| 224 | } else { |
| 225 | sgiter = sg; |
| 226 | if (!IS_ALIGNED(sgiter->length, SZ_1M)) |
| 227 | return -EINVAL; |
| 228 | cnt = sg->length / SZ_1M; |
| 229 | while ((sgiter = sg_next(sgiter))) { |
| 230 | if (!IS_ALIGNED(sgiter->length, SZ_1M)) |
| 231 | return -EINVAL; |
| 232 | cnt += sgiter->length / SZ_1M; |
| 233 | } |
| 234 | |
| 235 | pa_list = kmalloc_array(cnt, sizeof(*pa_list), GFP_KERNEL); |
| 236 | if (!pa_list) |
| 237 | return -ENOMEM; |
| 238 | |
| 239 | sgiter = sg; |
| 240 | cnt = 0; |
| 241 | pa = msm_secure_get_phys_addr(sgiter); |
| 242 | while (offset < len) { |
| 243 | |
| 244 | if (!IS_ALIGNED(pa, SZ_1M)) { |
| 245 | kfree(pa_list); |
| 246 | return -EINVAL; |
| 247 | } |
| 248 | |
| 249 | pa_list[cnt] = pa + chunk_offset; |
| 250 | chunk_offset += SZ_1M; |
| 251 | offset += SZ_1M; |
| 252 | cnt++; |
| 253 | |
| 254 | if (chunk_offset >= sgiter->length && offset < len) { |
| 255 | chunk_offset = 0; |
| 256 | sgiter = sg_next(sgiter); |
| 257 | pa = msm_secure_get_phys_addr(sgiter); |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | desc.args[0] = virt_to_phys(pa_list); |
| 262 | desc.args[1] = cnt; |
| 263 | desc.args[2] = SZ_1M; |
| 264 | flush_va = pa_list; |
| 265 | } |
| 266 | |
| 267 | desc.args[3] = cfg->arm_msm_secure_cfg.sec_id; |
| 268 | desc.args[4] = cfg->arm_msm_secure_cfg.cbndx; |
| 269 | desc.args[5] = iova; |
| 270 | desc.args[6] = len; |
| 271 | desc.args[7] = 0; |
| 272 | |
| 273 | desc.arginfo = SCM_ARGS(8, SCM_RW, SCM_VAL, SCM_VAL, SCM_VAL, SCM_VAL, |
| 274 | SCM_VAL, SCM_VAL, SCM_VAL); |
| 275 | |
| 276 | /* |
| 277 | * Ensure that the buffer is in RAM by the time it gets to TZ |
| 278 | */ |
| 279 | |
| 280 | flush_va_end = (void *) (((unsigned long) flush_va) + |
| 281 | (cnt * sizeof(*pa_list))); |
Charan Teja Reddy | 313991e | 2018-03-12 12:19:31 +0530 | [diff] [blame] | 282 | |
| 283 | mutex_lock(&data->pgtbl_lock); |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 284 | dmac_clean_range(flush_va, flush_va_end); |
| 285 | |
| 286 | if (is_scm_armv8()) { |
Charan Teja Reddy | 313991e | 2018-03-12 12:19:31 +0530 | [diff] [blame] | 287 | ret = scm_call2(SCM_SIP_FNID(SCM_SVC_MP, |
| 288 | IOMMU_SECURE_MAP2_FLAT), &desc); |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 289 | resp = desc.ret[0]; |
| 290 | |
| 291 | if (ret || resp) |
| 292 | ret = -EINVAL; |
| 293 | else |
| 294 | ret = len; |
| 295 | } |
Charan Teja Reddy | 313991e | 2018-03-12 12:19:31 +0530 | [diff] [blame] | 296 | mutex_unlock(&data->pgtbl_lock); |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 297 | |
| 298 | kfree(pa_list); |
| 299 | return ret; |
| 300 | } |
| 301 | |
| 302 | static size_t msm_secure_unmap(struct io_pgtable_ops *ops, unsigned long iova, |
| 303 | size_t len) |
| 304 | { |
| 305 | struct msm_secure_io_pgtable *data = io_pgtable_ops_to_data(ops); |
| 306 | struct io_pgtable_cfg *cfg = &data->iop.cfg; |
| 307 | int ret = -EINVAL; |
| 308 | struct scm_desc desc = {0}; |
| 309 | |
| 310 | if (!IS_ALIGNED(iova, SZ_1M) || !IS_ALIGNED(len, SZ_1M)) |
| 311 | return ret; |
| 312 | |
| 313 | desc.args[0] = cfg->arm_msm_secure_cfg.sec_id; |
| 314 | desc.args[1] = cfg->arm_msm_secure_cfg.cbndx; |
| 315 | desc.args[2] = iova; |
| 316 | desc.args[3] = len; |
| 317 | desc.args[4] = IOMMU_TLBINVAL_FLAG; |
| 318 | desc.arginfo = SCM_ARGS(5); |
| 319 | |
Charan Teja Reddy | 313991e | 2018-03-12 12:19:31 +0530 | [diff] [blame] | 320 | mutex_lock(&data->pgtbl_lock); |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 321 | if (is_scm_armv8()) { |
Charan Teja Reddy | 313991e | 2018-03-12 12:19:31 +0530 | [diff] [blame] | 322 | ret = scm_call2(SCM_SIP_FNID(SCM_SVC_MP, |
| 323 | IOMMU_SECURE_UNMAP2_FLAT), &desc); |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 324 | |
| 325 | if (!ret) |
| 326 | ret = len; |
| 327 | } |
Charan Teja Reddy | 313991e | 2018-03-12 12:19:31 +0530 | [diff] [blame] | 328 | mutex_unlock(&data->pgtbl_lock); |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 329 | return ret; |
| 330 | } |
| 331 | |
| 332 | static phys_addr_t msm_secure_iova_to_phys(struct io_pgtable_ops *ops, |
| 333 | unsigned long iova) |
| 334 | { |
| 335 | return -EINVAL; |
| 336 | } |
| 337 | |
| 338 | static struct msm_secure_io_pgtable * |
| 339 | msm_secure_alloc_pgtable_data(struct io_pgtable_cfg *cfg) |
| 340 | { |
| 341 | struct msm_secure_io_pgtable *data; |
| 342 | |
| 343 | data = kmalloc(sizeof(*data), GFP_KERNEL); |
| 344 | if (!data) |
| 345 | return NULL; |
| 346 | |
| 347 | data->iop.ops = (struct io_pgtable_ops) { |
| 348 | .map = msm_secure_map, |
| 349 | .map_sg = msm_secure_map_sg, |
| 350 | .unmap = msm_secure_unmap, |
| 351 | .iova_to_phys = msm_secure_iova_to_phys, |
| 352 | }; |
Charan Teja Reddy | 313991e | 2018-03-12 12:19:31 +0530 | [diff] [blame] | 353 | mutex_init(&data->pgtbl_lock); |
Charan Teja Reddy | 35144b0 | 2017-09-05 16:20:46 +0530 | [diff] [blame] | 354 | |
| 355 | return data; |
| 356 | } |
| 357 | |
| 358 | static struct io_pgtable * |
| 359 | msm_secure_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie) |
| 360 | { |
| 361 | struct msm_secure_io_pgtable *data = |
| 362 | msm_secure_alloc_pgtable_data(cfg); |
| 363 | |
| 364 | return &data->iop; |
| 365 | } |
| 366 | |
| 367 | static void msm_secure_free_pgtable(struct io_pgtable *iop) |
| 368 | { |
| 369 | struct msm_secure_io_pgtable *data = io_pgtable_to_data(iop); |
| 370 | |
| 371 | kfree(data); |
| 372 | } |
| 373 | |
| 374 | struct io_pgtable_init_fns io_pgtable_arm_msm_secure_init_fns = { |
| 375 | .alloc = msm_secure_alloc_pgtable, |
| 376 | .free = msm_secure_free_pgtable, |
| 377 | }; |