2 * Copyright 2019 Advanced Micro Devices, Inc.
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
24 #ifndef __AMDGPU_MES_H__
25 #define __AMDGPU_MES_H__
27 #include "amdgpu_irq.h"
28 #include "kgd_kfd_interface.h"
29 #include "amdgpu_gfx.h"
30 #include <linux/sched/mm.h>
32 #define AMDGPU_MES_MAX_COMPUTE_PIPES 8
33 #define AMDGPU_MES_MAX_GFX_PIPES 2
34 #define AMDGPU_MES_MAX_SDMA_PIPES 2
36 enum amdgpu_mes_priority_level {
37 AMDGPU_MES_PRIORITY_LEVEL_LOW = 0,
38 AMDGPU_MES_PRIORITY_LEVEL_NORMAL = 1,
39 AMDGPU_MES_PRIORITY_LEVEL_MEDIUM = 2,
40 AMDGPU_MES_PRIORITY_LEVEL_HIGH = 3,
41 AMDGPU_MES_PRIORITY_LEVEL_REALTIME = 4,
42 AMDGPU_MES_PRIORITY_NUM_LEVELS
45 #define AMDGPU_MES_PROC_CTX_SIZE 0x1000 /* one page area */
46 #define AMDGPU_MES_GANG_CTX_SIZE 0x1000 /* one page area */
48 struct amdgpu_mes_funcs;
50 enum admgpu_mes_pipe {
51 AMDGPU_MES_SCHED_PIPE = 0,
53 AMDGPU_MAX_MES_PIPES = 2,
57 struct amdgpu_device *adev;
59 struct mutex mutex_hidden;
62 struct idr gang_id_idr;
63 struct idr queue_id_idr;
64 struct ida doorbell_ida;
66 spinlock_t queue_id_lock;
68 uint32_t total_max_queue;
69 uint32_t doorbell_id_offset;
70 uint32_t max_doorbell_slices;
72 uint64_t default_process_quantum;
73 uint64_t default_gang_quantum;
75 struct amdgpu_ring ring;
77 const struct firmware *fw[AMDGPU_MAX_MES_PIPES];
80 struct amdgpu_bo *ucode_fw_obj[AMDGPU_MAX_MES_PIPES];
81 uint64_t ucode_fw_gpu_addr[AMDGPU_MAX_MES_PIPES];
82 uint32_t *ucode_fw_ptr[AMDGPU_MAX_MES_PIPES];
83 uint32_t ucode_fw_version[AMDGPU_MAX_MES_PIPES];
84 uint64_t uc_start_addr[AMDGPU_MAX_MES_PIPES];
87 struct amdgpu_bo *data_fw_obj[AMDGPU_MAX_MES_PIPES];
88 uint64_t data_fw_gpu_addr[AMDGPU_MAX_MES_PIPES];
89 uint32_t *data_fw_ptr[AMDGPU_MAX_MES_PIPES];
90 uint32_t data_fw_version[AMDGPU_MAX_MES_PIPES];
91 uint64_t data_start_addr[AMDGPU_MAX_MES_PIPES];
94 struct amdgpu_bo *eop_gpu_obj[AMDGPU_MAX_MES_PIPES];
95 uint64_t eop_gpu_addr[AMDGPU_MAX_MES_PIPES];
97 void *mqd_backup[AMDGPU_MAX_MES_PIPES];
98 struct amdgpu_irq_src irq[AMDGPU_MAX_MES_PIPES];
100 uint32_t vmid_mask_gfxhub;
101 uint32_t vmid_mask_mmhub;
102 uint32_t compute_hqd_mask[AMDGPU_MES_MAX_COMPUTE_PIPES];
103 uint32_t gfx_hqd_mask[AMDGPU_MES_MAX_GFX_PIPES];
104 uint32_t sdma_hqd_mask[AMDGPU_MES_MAX_SDMA_PIPES];
105 uint32_t agreegated_doorbells[AMDGPU_MES_PRIORITY_NUM_LEVELS];
106 uint32_t sch_ctx_offs;
107 uint64_t sch_ctx_gpu_addr;
108 uint64_t *sch_ctx_ptr;
109 uint32_t query_status_fence_offs;
110 uint64_t query_status_fence_gpu_addr;
111 uint64_t *query_status_fence_ptr;
112 uint32_t saved_flags;
114 /* initialize kiq pipe */
115 int (*kiq_hw_init)(struct amdgpu_device *adev);
116 int (*kiq_hw_fini)(struct amdgpu_device *adev);
118 /* ip specific functions */
119 const struct amdgpu_mes_funcs *funcs;
122 struct amdgpu_mes_process {
124 struct amdgpu_vm *vm;
125 uint64_t pd_gpu_addr;
126 struct amdgpu_bo *proc_ctx_bo;
127 uint64_t proc_ctx_gpu_addr;
128 void *proc_ctx_cpu_ptr;
129 uint64_t process_quantum;
130 struct list_head gang_list;
131 uint32_t doorbell_index;
132 unsigned long *doorbell_bitmap;
133 struct mutex doorbell_lock;
136 struct amdgpu_mes_gang {
139 int inprocess_gang_priority;
140 int global_priority_level;
141 struct list_head list;
142 struct amdgpu_mes_process *process;
143 struct amdgpu_bo *gang_ctx_bo;
144 uint64_t gang_ctx_gpu_addr;
145 void *gang_ctx_cpu_ptr;
146 uint64_t gang_quantum;
147 struct list_head queue_list;
150 struct amdgpu_mes_queue {
151 struct list_head list;
152 struct amdgpu_mes_gang *gang;
154 uint64_t doorbell_off;
155 struct amdgpu_bo *mqd_obj;
157 uint64_t mqd_gpu_addr;
158 uint64_t wptr_gpu_addr;
161 struct amdgpu_ring *ring;
164 struct amdgpu_mes_queue_properties {
166 uint64_t hqd_base_gpu_addr;
167 uint64_t rptr_gpu_addr;
168 uint64_t wptr_gpu_addr;
170 uint64_t eop_gpu_addr;
171 uint32_t hqd_pipe_priority;
172 uint32_t hqd_queue_priority;
174 struct amdgpu_ring *ring;
176 uint64_t doorbell_off;
179 struct amdgpu_mes_gang_properties {
181 uint32_t gang_quantum;
182 uint32_t inprocess_gang_priority;
183 uint32_t priority_level;
184 int global_priority_level;
187 struct mes_add_queue_input {
189 uint64_t page_table_base_addr;
190 uint64_t process_va_start;
191 uint64_t process_va_end;
192 uint64_t process_quantum;
193 uint64_t process_context_addr;
194 uint64_t gang_quantum;
195 uint64_t gang_context_addr;
196 uint32_t inprocess_gang_priority;
197 uint32_t gang_global_priority_level;
198 uint32_t doorbell_offset;
209 struct mes_remove_queue_input {
210 uint32_t doorbell_offset;
211 uint64_t gang_context_addr;
214 struct mes_unmap_legacy_queue_input {
215 enum amdgpu_unmap_queues_action action;
217 uint32_t doorbell_offset;
220 uint64_t trail_fence_addr;
221 uint64_t trail_fence_data;
224 struct mes_suspend_gang_input {
225 bool suspend_all_gangs;
226 uint64_t gang_context_addr;
227 uint64_t suspend_fence_addr;
228 uint32_t suspend_fence_value;
231 struct mes_resume_gang_input {
232 bool resume_all_gangs;
233 uint64_t gang_context_addr;
236 struct amdgpu_mes_funcs {
237 int (*add_hw_queue)(struct amdgpu_mes *mes,
238 struct mes_add_queue_input *input);
240 int (*remove_hw_queue)(struct amdgpu_mes *mes,
241 struct mes_remove_queue_input *input);
243 int (*unmap_legacy_queue)(struct amdgpu_mes *mes,
244 struct mes_unmap_legacy_queue_input *input);
246 int (*suspend_gang)(struct amdgpu_mes *mes,
247 struct mes_suspend_gang_input *input);
249 int (*resume_gang)(struct amdgpu_mes *mes,
250 struct mes_resume_gang_input *input);
253 #define amdgpu_mes_kiq_hw_init(adev) (adev)->mes.kiq_hw_init((adev))
254 #define amdgpu_mes_kiq_hw_fini(adev) (adev)->mes.kiq_hw_fini((adev))
256 int amdgpu_mes_ctx_get_offs(struct amdgpu_ring *ring, unsigned int id_offs);
258 int amdgpu_mes_init(struct amdgpu_device *adev);
259 void amdgpu_mes_fini(struct amdgpu_device *adev);
261 int amdgpu_mes_create_process(struct amdgpu_device *adev, int pasid,
262 struct amdgpu_vm *vm);
263 void amdgpu_mes_destroy_process(struct amdgpu_device *adev, int pasid);
265 int amdgpu_mes_add_gang(struct amdgpu_device *adev, int pasid,
266 struct amdgpu_mes_gang_properties *gprops,
268 int amdgpu_mes_remove_gang(struct amdgpu_device *adev, int gang_id);
270 int amdgpu_mes_suspend(struct amdgpu_device *adev);
271 int amdgpu_mes_resume(struct amdgpu_device *adev);
273 int amdgpu_mes_add_hw_queue(struct amdgpu_device *adev, int gang_id,
274 struct amdgpu_mes_queue_properties *qprops,
276 int amdgpu_mes_remove_hw_queue(struct amdgpu_device *adev, int queue_id);
278 int amdgpu_mes_unmap_legacy_queue(struct amdgpu_device *adev,
279 struct amdgpu_ring *ring,
280 enum amdgpu_unmap_queues_action action,
281 u64 gpu_addr, u64 seq);
283 int amdgpu_mes_add_ring(struct amdgpu_device *adev, int gang_id,
284 int queue_type, int idx,
285 struct amdgpu_mes_ctx_data *ctx_data,
286 struct amdgpu_ring **out);
287 void amdgpu_mes_remove_ring(struct amdgpu_device *adev,
288 struct amdgpu_ring *ring);
290 int amdgpu_mes_ctx_alloc_meta_data(struct amdgpu_device *adev,
291 struct amdgpu_mes_ctx_data *ctx_data);
292 void amdgpu_mes_ctx_free_meta_data(struct amdgpu_mes_ctx_data *ctx_data);
293 int amdgpu_mes_ctx_map_meta_data(struct amdgpu_device *adev,
294 struct amdgpu_vm *vm,
295 struct amdgpu_mes_ctx_data *ctx_data);
297 int amdgpu_mes_self_test(struct amdgpu_device *adev);
299 int amdgpu_mes_alloc_process_doorbells(struct amdgpu_device *adev,
300 unsigned int *doorbell_index);
301 void amdgpu_mes_free_process_doorbells(struct amdgpu_device *adev,
302 unsigned int doorbell_index);
303 unsigned int amdgpu_mes_get_doorbell_dw_offset_in_bar(
304 struct amdgpu_device *adev,
305 uint32_t doorbell_index,
306 unsigned int doorbell_id);
307 int amdgpu_mes_doorbell_process_slice(struct amdgpu_device *adev);
310 * MES lock can be taken in MMU notifiers.
312 * A bit more detail about why to set no-FS reclaim with MES lock:
314 * The purpose of the MMU notifier is to stop GPU access to memory so
315 * that the Linux VM subsystem can move pages around safely. This is
316 * done by preempting user mode queues for the affected process. When
317 * MES is used, MES lock needs to be taken to preempt the queues.
319 * The MMU notifier callback entry point in the driver is
320 * amdgpu_mn_invalidate_range_start_hsa. The relevant call chain from
322 * amdgpu_amdkfd_evict_userptr -> kgd2kfd_quiesce_mm ->
323 * kfd_process_evict_queues -> pdd->dev->dqm->ops.evict_process_queues
325 * The last part of the chain is a function pointer where we take the
328 * The problem with taking locks in the MMU notifier is, that MMU
329 * notifiers can be called in reclaim-FS context. That's where the
330 * kernel frees up pages to make room for new page allocations under
331 * memory pressure. While we are running in reclaim-FS context, we must
332 * not trigger another memory reclaim operation because that would
333 * recursively reenter the reclaim code and cause a deadlock. The
334 * memalloc_nofs_save/restore calls guarantee that.
336 * In addition we also need to avoid lock dependencies on other locks taken
337 * under the MES lock, for example reservation locks. Here is a possible
338 * scenario of a deadlock:
339 * Thread A: takes and holds reservation lock | triggers reclaim-FS |
340 * MMU notifier | blocks trying to take MES lock
341 * Thread B: takes and holds MES lock | blocks trying to take reservation lock
343 * In this scenario Thread B gets involved in a deadlock even without
344 * triggering a reclaim-FS operation itself.
345 * To fix this and break the lock dependency chain you'd need to either:
346 * 1. protect reservation locks with memalloc_nofs_save/restore, or
347 * 2. avoid taking reservation locks under the MES lock.
349 * Reservation locks are taken all over the kernel in different subsystems, we
350 * have no control over them and their lock dependencies.So the only workable
351 * solution is to avoid taking other locks under the MES lock.
352 * As a result, make sure no reclaim-FS happens while holding this lock anywhere
353 * to prevent deadlocks when an MMU notifier runs in reclaim-FS context.
355 static inline void amdgpu_mes_lock(struct amdgpu_mes *mes)
357 mutex_lock(&mes->mutex_hidden);
358 mes->saved_flags = memalloc_noreclaim_save();
361 static inline void amdgpu_mes_unlock(struct amdgpu_mes *mes)
363 memalloc_noreclaim_restore(mes->saved_flags);
364 mutex_unlock(&mes->mutex_hidden);
366 #endif /* __AMDGPU_MES_H__ */