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
kfd_init_apertures_vi(struct kfd_process_device * pdd,uint8_t id)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
kfd_init_apertures_v9(struct kfd_process_device * pdd,uint8_t id)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
kfd_init_apertures(struct kfd_process * process)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 dev_err(dev->adev->dev,
384 "Failed to create process device data\n");
385 return -ENOMEM;
386 }
387 /*
388 * For 64 bit process apertures will be statically reserved in
389 * the x86_64 non canonical process address space
390 * amdkfd doesn't currently support apertures for 32 bit process
391 */
392 if (process->is_32bit_user_mode) {
393 pdd->lds_base = pdd->lds_limit = 0;
394 pdd->gpuvm_base = pdd->gpuvm_limit = 0;
395 pdd->scratch_base = pdd->scratch_limit = 0;
396 } else {
397 switch (dev->adev->asic_type) {
398 case CHIP_KAVERI:
399 case CHIP_HAWAII:
400 case CHIP_CARRIZO:
401 case CHIP_TONGA:
402 case CHIP_FIJI:
403 case CHIP_POLARIS10:
404 case CHIP_POLARIS11:
405 case CHIP_POLARIS12:
406 case CHIP_VEGAM:
407 kfd_init_apertures_vi(pdd, id);
408 break;
409 default:
410 if (KFD_GC_VERSION(dev) >= IP_VERSION(9, 0, 1))
411 kfd_init_apertures_v9(pdd, id);
412 else {
413 WARN(1, "Unexpected ASIC family %u",
414 dev->adev->asic_type);
415 return -EINVAL;
416 }
417 }
418 }
419
420 dev_dbg(kfd_device, "node id %u\n", id);
421 dev_dbg(kfd_device, "gpu id %u\n", pdd->dev->id);
422 dev_dbg(kfd_device, "lds_base %llX\n", pdd->lds_base);
423 dev_dbg(kfd_device, "lds_limit %llX\n", pdd->lds_limit);
424 dev_dbg(kfd_device, "gpuvm_base %llX\n", pdd->gpuvm_base);
425 dev_dbg(kfd_device, "gpuvm_limit %llX\n", pdd->gpuvm_limit);
426 dev_dbg(kfd_device, "scratch_base %llX\n", pdd->scratch_base);
427 dev_dbg(kfd_device, "scratch_limit %llX\n", pdd->scratch_limit);
428
429 id++;
430 }
431
432 return 0;
433 }
434