1 // SPDX-License-Identifier: GPL-2.0 OR MIT 2 /* 3 * Copyright 2014-2022 Advanced Micro Devices, Inc. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be included in 13 * all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 21 * OTHER DEALINGS IN THE SOFTWARE. 22 * 23 */ 24 25 #include <linux/device.h> 26 #include <linux/export.h> 27 #include <linux/err.h> 28 #include <linux/fs.h> 29 #include <linux/sched.h> 30 #include <linux/slab.h> 31 #include <linux/uaccess.h> 32 #include <linux/compat.h> 33 #include <uapi/linux/kfd_ioctl.h> 34 #include <linux/time.h> 35 #include "kfd_priv.h" 36 #include <linux/mm.h> 37 #include <linux/mman.h> 38 #include <linux/processor.h> 39 #include "amdgpu_vm.h" 40 41 /* 42 * The primary memory I/O features being added for revisions of gfxip 43 * beyond 7.0 (Kaveri) are: 44 * 45 * Access to ATC/IOMMU mapped memory w/ associated extension of VA to 48b 46 * 47 * “Flat” shader memory access – These are new shader vector memory 48 * operations that do not reference a T#/V# so a “pointer” is what is 49 * sourced from the vector gprs for direct access to memory. 50 * This pointer space has the Shared(LDS) and Private(Scratch) memory 51 * mapped into this pointer space as apertures. 52 * The hardware then determines how to direct the memory request 53 * based on what apertures the request falls in. 54 * 55 * Unaligned support and alignment check 56 * 57 * 58 * System Unified Address - SUA 59 * 60 * The standard usage for GPU virtual addresses are that they are mapped by 61 * a set of page tables we call GPUVM and these page tables are managed by 62 * a combination of vidMM/driver software components. The current virtual 63 * address (VA) range for GPUVM is 40b. 64 * 65 * As of gfxip7.1 and beyond we’re adding the ability for compute memory 66 * clients (CP/RLC, DMA, SHADER(ifetch, scalar, and vector ops)) to access 67 * the same page tables used by host x86 processors and that are managed by 68 * the operating system. This is via a technique and hardware called ATC/IOMMU. 69 * The GPU has the capability of accessing both the GPUVM and ATC address 70 * spaces for a given VMID (process) simultaneously and we call this feature 71 * system unified address (SUA). 72 * 73 * There are three fundamental address modes of operation for a given VMID 74 * (process) on the GPU: 75 * 76 * HSA64 – 64b pointers and the default address space is ATC 77 * HSA32 – 32b pointers and the default address space is ATC 78 * GPUVM – 64b pointers and the default address space is GPUVM (driver 79 * model mode) 80 * 81 * 82 * HSA64 - ATC/IOMMU 64b 83 * 84 * A 64b pointer in the AMD64/IA64 CPU architecture is not fully utilized 85 * by the CPU so an AMD CPU can only access the high area 86 * (VA[63:47] == 0x1FFFF) and low area (VA[63:47 == 0) of the address space 87 * so the actual VA carried to translation is 48b. There is a “hole” in 88 * the middle of the 64b VA space. 89 * 90 * The GPU not only has access to all of the CPU accessible address space via 91 * ATC/IOMMU, but it also has access to the GPUVM address space. The “system 92 * unified address” feature (SUA) is the mapping of GPUVM and ATC address 93 * spaces into a unified pointer space. The method we take for 64b mode is 94 * to map the full 40b GPUVM address space into the hole of the 64b address 95 * space. 96 97 * The GPUVM_Base/GPUVM_Limit defines the aperture in the 64b space where we 98 * direct requests to be translated via GPUVM page tables instead of the 99 * IOMMU path. 100 * 101 * 102 * 64b to 49b Address conversion 103 * 104 * Note that there are still significant portions of unused regions (holes) 105 * in the 64b address space even for the GPU. There are several places in 106 * the pipeline (sw and hw), we wish to compress the 64b virtual address 107 * to a 49b address. This 49b address is constituted of an “ATC” bit 108 * plus a 48b virtual address. This 49b address is what is passed to the 109 * translation hardware. ATC==0 means the 48b address is a GPUVM address 110 * (max of 2^40 – 1) intended to be translated via GPUVM page tables. 111 * ATC==1 means the 48b address is intended to be translated via IOMMU 112 * page tables. 113 * 114 * A 64b pointer is compared to the apertures that are defined (Base/Limit), in 115 * this case the GPUVM aperture (red) is defined and if a pointer falls in this 116 * aperture, we subtract the GPUVM_Base address and set the ATC bit to zero 117 * as part of the 64b to 49b conversion. 118 * 119 * Where this 64b to 49b conversion is done is a function of the usage. 120 * Most GPU memory access is via memory objects where the driver builds 121 * a descriptor which consists of a base address and a memory access by 122 * the GPU usually consists of some kind of an offset or Cartesian coordinate 123 * that references this memory descriptor. This is the case for shader 124 * instructions that reference the T# or V# constants, or for specified 125 * locations of assets (ex. the shader program location). In these cases 126 * the driver is what handles the 64b to 49b conversion and the base 127 * address in the descriptor (ex. V# or T# or shader program location) 128 * is defined as a 48b address w/ an ATC bit. For this usage a given 129 * memory object cannot straddle multiple apertures in the 64b address 130 * space. For example a shader program cannot jump in/out between ATC 131 * and GPUVM space. 132 * 133 * In some cases we wish to pass a 64b pointer to the GPU hardware and 134 * the GPU hw does the 64b to 49b conversion before passing memory 135 * requests to the cache/memory system. This is the case for the 136 * S_LOAD and FLAT_* shader memory instructions where we have 64b pointers 137 * in scalar and vector GPRs respectively. 138 * 139 * In all cases (no matter where the 64b -> 49b conversion is done), the gfxip 140 * hardware sends a 48b address along w/ an ATC bit, to the memory controller 141 * on the memory request interfaces. 142 * 143 * <client>_MC_rdreq_atc // read request ATC bit 144 * 145 * 0 : <client>_MC_rdreq_addr is a GPUVM VA 146 * 147 * 1 : <client>_MC_rdreq_addr is a ATC VA 148 * 149 * 150 * “Spare” aperture (APE1) 151 * 152 * We use the GPUVM aperture to differentiate ATC vs. GPUVM, but we also use 153 * apertures to set the Mtype field for S_LOAD/FLAT_* ops which is input to the 154 * config tables for setting cache policies. The “spare” (APE1) aperture is 155 * motivated by getting a different Mtype from the default. 156 * The default aperture isn’t an actual base/limit aperture; it is just the 157 * address space that doesn’t hit any defined base/limit apertures. 158 * The following diagram is a complete picture of the gfxip7.x SUA apertures. 159 * The APE1 can be placed either below or above 160 * the hole (cannot be in the hole). 161 * 162 * 163 * General Aperture definitions and rules 164 * 165 * An aperture register definition consists of a Base, Limit, Mtype, and 166 * usually an ATC bit indicating which translation tables that aperture uses. 167 * In all cases (for SUA and DUA apertures discussed later), aperture base 168 * and limit definitions are 64KB aligned. 169 * 170 * <ape>_Base[63:0] = { <ape>_Base_register[63:16], 0x0000 } 171 * 172 * <ape>_Limit[63:0] = { <ape>_Limit_register[63:16], 0xFFFF } 173 * 174 * The base and limit are considered inclusive to an aperture so being 175 * inside an aperture means (address >= Base) AND (address <= Limit). 176 * 177 * In no case is a payload that straddles multiple apertures expected to work. 178 * For example a load_dword_x4 that starts in one aperture and ends in another, 179 * does not work. For the vector FLAT_* ops we have detection capability in 180 * the shader for reporting a “memory violation” back to the 181 * SQ block for use in traps. 182 * A memory violation results when an op falls into the hole, 183 * or a payload straddles multiple apertures. The S_LOAD instruction 184 * does not have this detection. 185 * 186 * Apertures cannot overlap. 187 * 188 * 189 * 190 * HSA32 - ATC/IOMMU 32b 191 * 192 * For HSA32 mode, the pointers are interpreted as 32 bits and use a single GPR 193 * instead of two for the S_LOAD and FLAT_* ops. The entire GPUVM space of 40b 194 * will not fit so there is only partial visibility to the GPUVM 195 * space (defined by the aperture) for S_LOAD and FLAT_* ops. 196 * There is no spare (APE1) aperture for HSA32 mode. 197 * 198 * 199 * GPUVM 64b mode (driver model) 200 * 201 * This mode is related to HSA64 in that the difference really is that 202 * the default aperture is GPUVM (ATC==0) and not ATC space. 203 * We have gfxip7.x hardware that has FLAT_* and S_LOAD support for 204 * SUA GPUVM mode, but does not support HSA32/HSA64. 205 * 206 * 207 * Device Unified Address - DUA 208 * 209 * Device unified address (DUA) is the name of the feature that maps the 210 * Shared(LDS) memory and Private(Scratch) memory into the overall address 211 * space for use by the new FLAT_* vector memory ops. The Shared and 212 * Private memories are mapped as apertures into the address space, 213 * and the hardware detects when a FLAT_* memory request is to be redirected 214 * to the LDS or Scratch memory when it falls into one of these apertures. 215 * Like the SUA apertures, the Shared/Private apertures are 64KB aligned and 216 * the base/limit is “in” the aperture. For both HSA64 and GPUVM SUA modes, 217 * the Shared/Private apertures are always placed in a limited selection of 218 * options in the hole of the 64b address space. For HSA32 mode, the 219 * Shared/Private apertures can be placed anywhere in the 32b space 220 * except at 0. 221 * 222 * 223 * HSA64 Apertures for FLAT_* vector ops 224 * 225 * For HSA64 SUA mode, the Shared and Private apertures are always placed 226 * in the hole w/ a limited selection of possible locations. The requests 227 * that fall in the private aperture are expanded as a function of the 228 * work-item id (tid) and redirected to the location of the 229 * “hidden private memory”. The hidden private can be placed in either GPUVM 230 * or ATC space. The addresses that fall in the shared aperture are 231 * re-directed to the on-chip LDS memory hardware. 232 * 233 * 234 * HSA32 Apertures for FLAT_* vector ops 235 * 236 * In HSA32 mode, the Private and Shared apertures can be placed anywhere 237 * in the 32b space except at 0 (Private or Shared Base at zero disables 238 * the apertures). If the base address of the apertures are non-zero 239 * (ie apertures exists), the size is always 64KB. 240 * 241 * 242 * GPUVM Apertures for FLAT_* vector ops 243 * 244 * In GPUVM mode, the Shared/Private apertures are specified identically 245 * to HSA64 mode where they are always in the hole at a limited selection 246 * of locations. 247 * 248 * 249 * Aperture Definitions for SUA and DUA 250 * 251 * The interpretation of the aperture register definitions for a given 252 * VMID is a function of the “SUA Mode” which is one of HSA64, HSA32, or 253 * GPUVM64 discussed in previous sections. The mode is first decoded, and 254 * then the remaining register decode is a function of the mode. 255 * 256 * 257 * SUA Mode Decode 258 * 259 * For the S_LOAD and FLAT_* shader operations, the SUA mode is decoded from 260 * the COMPUTE_DISPATCH_INITIATOR:DATA_ATC bit and 261 * the SH_MEM_CONFIG:PTR32 bits. 262 * 263 * COMPUTE_DISPATCH_INITIATOR:DATA_ATC SH_MEM_CONFIG:PTR32 Mode 264 * 265 * 1 0 HSA64 266 * 267 * 1 1 HSA32 268 * 269 * 0 X GPUVM64 270 * 271 * In general the hardware will ignore the PTR32 bit and treat 272 * as “0” whenever DATA_ATC = “0”, but sw should set PTR32=0 273 * when DATA_ATC=0. 274 * 275 * The DATA_ATC bit is only set for compute dispatches. 276 * All “Draw” dispatches are hardcoded to GPUVM64 mode 277 * for FLAT_* / S_LOAD operations. 278 */ 279 280 #define MAKE_GPUVM_APP_BASE_VI(gpu_num) \ 281 (((uint64_t)(gpu_num) << 61) + 0x1000000000000L) 282 283 #define MAKE_GPUVM_APP_LIMIT(base, size) \ 284 (((uint64_t)(base) & 0xFFFFFF0000000000UL) + (size) - 1) 285 286 #define MAKE_SCRATCH_APP_BASE_VI() \ 287 (((uint64_t)(0x1UL) << 61) + 0x100000000L) 288 289 #define MAKE_SCRATCH_APP_LIMIT(base) \ 290 (((uint64_t)base & 0xFFFFFFFF00000000UL) | 0xFFFFFFFF) 291 292 #define MAKE_LDS_APP_BASE_VI() \ 293 (((uint64_t)(0x1UL) << 61) + 0x0) 294 #define MAKE_LDS_APP_LIMIT(base) \ 295 (((uint64_t)(base) & 0xFFFFFFFF00000000UL) | 0xFFFFFFFF) 296 297 /* On GFXv9 the LDS and scratch apertures are programmed independently 298 * using the high 16 bits of the 64-bit virtual address. They must be 299 * in the hole, which will be the case as long as the high 16 bits are 300 * not 0. 301 * 302 * The aperture sizes are still 4GB implicitly. 303 * 304 * A GPUVM aperture is not applicable on GFXv9. 305 */ 306 #define MAKE_LDS_APP_BASE_V9() ((uint64_t)(0x1UL) << 48) 307 #define MAKE_SCRATCH_APP_BASE_V9() ((uint64_t)(0x2UL) << 48) 308 309 /* User mode manages most of the SVM aperture address space. The low 310 * 16MB are reserved for kernel use (CWSR trap handler and kernel IB 311 * for now). 312 */ 313 #define SVM_USER_BASE (u64)(KFD_CWSR_TBA_TMA_SIZE + 2*PAGE_SIZE) 314 #define SVM_CWSR_BASE (SVM_USER_BASE - KFD_CWSR_TBA_TMA_SIZE) 315 #define SVM_IB_BASE (SVM_CWSR_BASE - PAGE_SIZE) 316 317 static void kfd_init_apertures_vi(struct kfd_process_device *pdd, uint8_t id) 318 { 319 /* 320 * node id couldn't be 0 - the three MSB bits of 321 * aperture shouldn't be 0 322 */ 323 pdd->lds_base = MAKE_LDS_APP_BASE_VI(); 324 pdd->lds_limit = MAKE_LDS_APP_LIMIT(pdd->lds_base); 325 326 /* dGPUs: SVM aperture starting at 0 327 * with small reserved space for kernel. 328 * Set them to CANONICAL addresses. 329 */ 330 pdd->gpuvm_base = max(SVM_USER_BASE, AMDGPU_VA_RESERVED_BOTTOM); 331 pdd->gpuvm_limit = 332 pdd->dev->kfd->shared_resources.gpuvm_size - 1; 333 334 /* dGPUs: the reserved space for kernel 335 * before SVM 336 */ 337 pdd->qpd.cwsr_base = SVM_CWSR_BASE; 338 pdd->qpd.ib_base = SVM_IB_BASE; 339 340 pdd->scratch_base = MAKE_SCRATCH_APP_BASE_VI(); 341 pdd->scratch_limit = MAKE_SCRATCH_APP_LIMIT(pdd->scratch_base); 342 } 343 344 static void kfd_init_apertures_v9(struct kfd_process_device *pdd, uint8_t id) 345 { 346 pdd->lds_base = MAKE_LDS_APP_BASE_V9(); 347 pdd->lds_limit = MAKE_LDS_APP_LIMIT(pdd->lds_base); 348 349 pdd->gpuvm_base = AMDGPU_VA_RESERVED_BOTTOM; 350 pdd->gpuvm_limit = 351 pdd->dev->kfd->shared_resources.gpuvm_size - 1; 352 353 pdd->scratch_base = MAKE_SCRATCH_APP_BASE_V9(); 354 pdd->scratch_limit = MAKE_SCRATCH_APP_LIMIT(pdd->scratch_base); 355 356 /* 357 * Place TBA/TMA on opposite side of VM hole to prevent 358 * stray faults from triggering SVM on these pages. 359 */ 360 pdd->qpd.cwsr_base = AMDGPU_VA_RESERVED_TRAP_START(pdd->dev->adev); 361 } 362 363 int kfd_init_apertures(struct kfd_process *process) 364 { 365 uint8_t id = 0; 366 struct kfd_node *dev; 367 struct kfd_process_device *pdd; 368 369 /*Iterating over all devices*/ 370 while (kfd_topology_enum_kfd_devices(id, &dev) == 0) { 371 if (!dev || kfd_devcgroup_check_permission(dev)) { 372 /* Skip non GPU devices and devices to which the 373 * current process have no access to. Access can be 374 * limited by placing the process in a specific 375 * cgroup hierarchy 376 */ 377 id++; 378 continue; 379 } 380 381 pdd = kfd_create_process_device_data(dev, process); 382 if (!pdd) { 383 pr_err("Failed to create process device data\n"); 384 return -ENOMEM; 385 } 386 /* 387 * For 64 bit process apertures will be statically reserved in 388 * the x86_64 non canonical process address space 389 * amdkfd doesn't currently support apertures for 32 bit process 390 */ 391 if (process->is_32bit_user_mode) { 392 pdd->lds_base = pdd->lds_limit = 0; 393 pdd->gpuvm_base = pdd->gpuvm_limit = 0; 394 pdd->scratch_base = pdd->scratch_limit = 0; 395 } else { 396 switch (dev->adev->asic_type) { 397 case CHIP_KAVERI: 398 case CHIP_HAWAII: 399 case CHIP_CARRIZO: 400 case CHIP_TONGA: 401 case CHIP_FIJI: 402 case CHIP_POLARIS10: 403 case CHIP_POLARIS11: 404 case CHIP_POLARIS12: 405 case CHIP_VEGAM: 406 kfd_init_apertures_vi(pdd, id); 407 break; 408 default: 409 if (KFD_GC_VERSION(dev) >= IP_VERSION(9, 0, 1)) 410 kfd_init_apertures_v9(pdd, id); 411 else { 412 WARN(1, "Unexpected ASIC family %u", 413 dev->adev->asic_type); 414 return -EINVAL; 415 } 416 } 417 } 418 419 dev_dbg(kfd_device, "node id %u\n", id); 420 dev_dbg(kfd_device, "gpu id %u\n", pdd->dev->id); 421 dev_dbg(kfd_device, "lds_base %llX\n", pdd->lds_base); 422 dev_dbg(kfd_device, "lds_limit %llX\n", pdd->lds_limit); 423 dev_dbg(kfd_device, "gpuvm_base %llX\n", pdd->gpuvm_base); 424 dev_dbg(kfd_device, "gpuvm_limit %llX\n", pdd->gpuvm_limit); 425 dev_dbg(kfd_device, "scratch_base %llX\n", pdd->scratch_base); 426 dev_dbg(kfd_device, "scratch_limit %llX\n", pdd->scratch_limit); 427 428 id++; 429 } 430 431 return 0; 432 } 433