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[linux.git] / drivers / gpu / drm / amd / amdgpu / amdgpu_mes.h
1 /*
2  * Copyright 2019 Advanced Micro Devices, Inc.
3  *
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:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
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.
21  *
22  */
23
24 #ifndef __AMDGPU_MES_H__
25 #define __AMDGPU_MES_H__
26
27 #include "amdgpu_irq.h"
28 #include "kgd_kfd_interface.h"
29 #include "amdgpu_gfx.h"
30 #include "amdgpu_doorbell.h"
31 #include <linux/sched/mm.h>
32
33 #define AMDGPU_MES_MAX_COMPUTE_PIPES        8
34 #define AMDGPU_MES_MAX_GFX_PIPES            2
35 #define AMDGPU_MES_MAX_SDMA_PIPES           2
36
37 #define AMDGPU_MES_API_VERSION_SHIFT    12
38 #define AMDGPU_MES_FEAT_VERSION_SHIFT   24
39
40 #define AMDGPU_MES_VERSION_MASK         0x00000fff
41 #define AMDGPU_MES_API_VERSION_MASK     0x00fff000
42 #define AMDGPU_MES_FEAT_VERSION_MASK    0xff000000
43
44 enum amdgpu_mes_priority_level {
45         AMDGPU_MES_PRIORITY_LEVEL_LOW       = 0,
46         AMDGPU_MES_PRIORITY_LEVEL_NORMAL    = 1,
47         AMDGPU_MES_PRIORITY_LEVEL_MEDIUM    = 2,
48         AMDGPU_MES_PRIORITY_LEVEL_HIGH      = 3,
49         AMDGPU_MES_PRIORITY_LEVEL_REALTIME  = 4,
50         AMDGPU_MES_PRIORITY_NUM_LEVELS
51 };
52
53 #define AMDGPU_MES_PROC_CTX_SIZE 0x1000 /* one page area */
54 #define AMDGPU_MES_GANG_CTX_SIZE 0x1000 /* one page area */
55
56 struct amdgpu_mes_funcs;
57
58 enum admgpu_mes_pipe {
59         AMDGPU_MES_SCHED_PIPE = 0,
60         AMDGPU_MES_KIQ_PIPE,
61         AMDGPU_MAX_MES_PIPES = 2,
62 };
63
64 struct amdgpu_mes {
65         struct amdgpu_device            *adev;
66
67         struct mutex                    mutex_hidden;
68
69         struct idr                      pasid_idr;
70         struct idr                      gang_id_idr;
71         struct idr                      queue_id_idr;
72         struct ida                      doorbell_ida;
73
74         spinlock_t                      queue_id_lock;
75
76         uint32_t                        sched_version;
77         uint32_t                        kiq_version;
78
79         uint32_t                        total_max_queue;
80         uint32_t                        max_doorbell_slices;
81
82         uint64_t                        default_process_quantum;
83         uint64_t                        default_gang_quantum;
84
85         struct amdgpu_ring              ring;
86         spinlock_t                      ring_lock;
87
88         const struct firmware           *fw[AMDGPU_MAX_MES_PIPES];
89
90         /* mes ucode */
91         struct amdgpu_bo                *ucode_fw_obj[AMDGPU_MAX_MES_PIPES];
92         uint64_t                        ucode_fw_gpu_addr[AMDGPU_MAX_MES_PIPES];
93         uint32_t                        *ucode_fw_ptr[AMDGPU_MAX_MES_PIPES];
94         uint64_t                        uc_start_addr[AMDGPU_MAX_MES_PIPES];
95
96         /* mes ucode data */
97         struct amdgpu_bo                *data_fw_obj[AMDGPU_MAX_MES_PIPES];
98         uint64_t                        data_fw_gpu_addr[AMDGPU_MAX_MES_PIPES];
99         uint32_t                        *data_fw_ptr[AMDGPU_MAX_MES_PIPES];
100         uint64_t                        data_start_addr[AMDGPU_MAX_MES_PIPES];
101
102         /* eop gpu obj */
103         struct amdgpu_bo                *eop_gpu_obj[AMDGPU_MAX_MES_PIPES];
104         uint64_t                        eop_gpu_addr[AMDGPU_MAX_MES_PIPES];
105
106         void                            *mqd_backup[AMDGPU_MAX_MES_PIPES];
107         struct amdgpu_irq_src           irq[AMDGPU_MAX_MES_PIPES];
108
109         uint32_t                        vmid_mask_gfxhub;
110         uint32_t                        vmid_mask_mmhub;
111         uint32_t                        compute_hqd_mask[AMDGPU_MES_MAX_COMPUTE_PIPES];
112         uint32_t                        gfx_hqd_mask[AMDGPU_MES_MAX_GFX_PIPES];
113         uint32_t                        sdma_hqd_mask[AMDGPU_MES_MAX_SDMA_PIPES];
114         uint32_t                        aggregated_doorbells[AMDGPU_MES_PRIORITY_NUM_LEVELS];
115         uint32_t                        sch_ctx_offs;
116         uint64_t                        sch_ctx_gpu_addr;
117         uint64_t                        *sch_ctx_ptr;
118         uint32_t                        query_status_fence_offs;
119         uint64_t                        query_status_fence_gpu_addr;
120         uint64_t                        *query_status_fence_ptr;
121         uint32_t                        read_val_offs;
122         uint64_t                        read_val_gpu_addr;
123         uint32_t                        *read_val_ptr;
124
125         uint32_t                        saved_flags;
126
127         /* initialize kiq pipe */
128         int                             (*kiq_hw_init)(struct amdgpu_device *adev);
129         int                             (*kiq_hw_fini)(struct amdgpu_device *adev);
130
131         /* MES doorbells */
132         uint32_t                        db_start_dw_offset;
133         uint32_t                        num_mes_dbs;
134         unsigned long                   *doorbell_bitmap;
135
136         /* ip specific functions */
137         const struct amdgpu_mes_funcs   *funcs;
138 };
139
140 struct amdgpu_mes_process {
141         int                     pasid;
142         struct                  amdgpu_vm *vm;
143         uint64_t                pd_gpu_addr;
144         struct amdgpu_bo        *proc_ctx_bo;
145         uint64_t                proc_ctx_gpu_addr;
146         void                    *proc_ctx_cpu_ptr;
147         uint64_t                process_quantum;
148         struct                  list_head gang_list;
149         uint32_t                doorbell_index;
150         struct mutex            doorbell_lock;
151 };
152
153 struct amdgpu_mes_gang {
154         int                             gang_id;
155         int                             priority;
156         int                             inprocess_gang_priority;
157         int                             global_priority_level;
158         struct list_head                list;
159         struct amdgpu_mes_process       *process;
160         struct amdgpu_bo                *gang_ctx_bo;
161         uint64_t                        gang_ctx_gpu_addr;
162         void                            *gang_ctx_cpu_ptr;
163         uint64_t                        gang_quantum;
164         struct list_head                queue_list;
165 };
166
167 struct amdgpu_mes_queue {
168         struct list_head                list;
169         struct amdgpu_mes_gang          *gang;
170         int                             queue_id;
171         uint64_t                        doorbell_off;
172         struct amdgpu_bo                *mqd_obj;
173         void                            *mqd_cpu_ptr;
174         uint64_t                        mqd_gpu_addr;
175         uint64_t                        wptr_gpu_addr;
176         int                             queue_type;
177         int                             paging;
178         struct amdgpu_ring              *ring;
179 };
180
181 struct amdgpu_mes_queue_properties {
182         int                     queue_type;
183         uint64_t                hqd_base_gpu_addr;
184         uint64_t                rptr_gpu_addr;
185         uint64_t                wptr_gpu_addr;
186         uint64_t                wptr_mc_addr;
187         uint32_t                queue_size;
188         uint64_t                eop_gpu_addr;
189         uint32_t                hqd_pipe_priority;
190         uint32_t                hqd_queue_priority;
191         bool                    paging;
192         struct amdgpu_ring      *ring;
193         /* out */
194         uint64_t                doorbell_off;
195 };
196
197 struct amdgpu_mes_gang_properties {
198         uint32_t        priority;
199         uint32_t        gang_quantum;
200         uint32_t        inprocess_gang_priority;
201         uint32_t        priority_level;
202         int             global_priority_level;
203 };
204
205 struct mes_add_queue_input {
206         uint32_t        process_id;
207         uint64_t        page_table_base_addr;
208         uint64_t        process_va_start;
209         uint64_t        process_va_end;
210         uint64_t        process_quantum;
211         uint64_t        process_context_addr;
212         uint64_t        gang_quantum;
213         uint64_t        gang_context_addr;
214         uint32_t        inprocess_gang_priority;
215         uint32_t        gang_global_priority_level;
216         uint32_t        doorbell_offset;
217         uint64_t        mqd_addr;
218         uint64_t        wptr_addr;
219         uint64_t        wptr_mc_addr;
220         uint32_t        queue_type;
221         uint32_t        paging;
222         uint32_t        gws_base;
223         uint32_t        gws_size;
224         uint64_t        tba_addr;
225         uint64_t        tma_addr;
226         uint32_t        trap_en;
227         uint32_t        skip_process_ctx_clear;
228         uint32_t        is_kfd_process;
229         uint32_t        is_aql_queue;
230         uint32_t        queue_size;
231         uint32_t        exclusively_scheduled;
232 };
233
234 struct mes_remove_queue_input {
235         uint32_t        doorbell_offset;
236         uint64_t        gang_context_addr;
237 };
238
239 struct mes_unmap_legacy_queue_input {
240         enum amdgpu_unmap_queues_action    action;
241         uint32_t                           queue_type;
242         uint32_t                           doorbell_offset;
243         uint32_t                           pipe_id;
244         uint32_t                           queue_id;
245         uint64_t                           trail_fence_addr;
246         uint64_t                           trail_fence_data;
247 };
248
249 struct mes_suspend_gang_input {
250         bool            suspend_all_gangs;
251         uint64_t        gang_context_addr;
252         uint64_t        suspend_fence_addr;
253         uint32_t        suspend_fence_value;
254 };
255
256 struct mes_resume_gang_input {
257         bool            resume_all_gangs;
258         uint64_t        gang_context_addr;
259 };
260
261 enum mes_misc_opcode {
262         MES_MISC_OP_WRITE_REG,
263         MES_MISC_OP_READ_REG,
264         MES_MISC_OP_WRM_REG_WAIT,
265         MES_MISC_OP_WRM_REG_WR_WAIT,
266         MES_MISC_OP_SET_SHADER_DEBUGGER,
267 };
268
269 struct mes_misc_op_input {
270         enum mes_misc_opcode op;
271
272         union {
273                 struct {
274                         uint32_t                  reg_offset;
275                         uint64_t                  buffer_addr;
276                 } read_reg;
277
278                 struct {
279                         uint32_t                  reg_offset;
280                         uint32_t                  reg_value;
281                 } write_reg;
282
283                 struct {
284                         uint32_t                   ref;
285                         uint32_t                   mask;
286                         uint32_t                   reg0;
287                         uint32_t                   reg1;
288                 } wrm_reg;
289
290                 struct {
291                         uint64_t process_context_addr;
292                         union {
293                                 struct {
294                                         uint64_t single_memop : 1;
295                                         uint64_t single_alu_op : 1;
296                                         uint64_t reserved: 30;
297                                 };
298                                 uint32_t u32all;
299                         } flags;
300                         uint32_t spi_gdbg_per_vmid_cntl;
301                         uint32_t tcp_watch_cntl[4];
302                         uint32_t trap_en;
303                 } set_shader_debugger;
304         };
305 };
306
307 struct amdgpu_mes_funcs {
308         int (*add_hw_queue)(struct amdgpu_mes *mes,
309                             struct mes_add_queue_input *input);
310
311         int (*remove_hw_queue)(struct amdgpu_mes *mes,
312                                struct mes_remove_queue_input *input);
313
314         int (*unmap_legacy_queue)(struct amdgpu_mes *mes,
315                                   struct mes_unmap_legacy_queue_input *input);
316
317         int (*suspend_gang)(struct amdgpu_mes *mes,
318                             struct mes_suspend_gang_input *input);
319
320         int (*resume_gang)(struct amdgpu_mes *mes,
321                            struct mes_resume_gang_input *input);
322
323         int (*misc_op)(struct amdgpu_mes *mes,
324                        struct mes_misc_op_input *input);
325 };
326
327 #define amdgpu_mes_kiq_hw_init(adev) (adev)->mes.kiq_hw_init((adev))
328 #define amdgpu_mes_kiq_hw_fini(adev) (adev)->mes.kiq_hw_fini((adev))
329
330 int amdgpu_mes_ctx_get_offs(struct amdgpu_ring *ring, unsigned int id_offs);
331
332 int amdgpu_mes_init_microcode(struct amdgpu_device *adev, int pipe);
333 int amdgpu_mes_init(struct amdgpu_device *adev);
334 void amdgpu_mes_fini(struct amdgpu_device *adev);
335
336 int amdgpu_mes_create_process(struct amdgpu_device *adev, int pasid,
337                               struct amdgpu_vm *vm);
338 void amdgpu_mes_destroy_process(struct amdgpu_device *adev, int pasid);
339
340 int amdgpu_mes_add_gang(struct amdgpu_device *adev, int pasid,
341                         struct amdgpu_mes_gang_properties *gprops,
342                         int *gang_id);
343 int amdgpu_mes_remove_gang(struct amdgpu_device *adev, int gang_id);
344
345 int amdgpu_mes_suspend(struct amdgpu_device *adev);
346 int amdgpu_mes_resume(struct amdgpu_device *adev);
347
348 int amdgpu_mes_add_hw_queue(struct amdgpu_device *adev, int gang_id,
349                             struct amdgpu_mes_queue_properties *qprops,
350                             int *queue_id);
351 int amdgpu_mes_remove_hw_queue(struct amdgpu_device *adev, int queue_id);
352
353 int amdgpu_mes_unmap_legacy_queue(struct amdgpu_device *adev,
354                                   struct amdgpu_ring *ring,
355                                   enum amdgpu_unmap_queues_action action,
356                                   u64 gpu_addr, u64 seq);
357
358 uint32_t amdgpu_mes_rreg(struct amdgpu_device *adev, uint32_t reg);
359 int amdgpu_mes_wreg(struct amdgpu_device *adev,
360                     uint32_t reg, uint32_t val);
361 int amdgpu_mes_reg_wait(struct amdgpu_device *adev, uint32_t reg,
362                         uint32_t val, uint32_t mask);
363 int amdgpu_mes_reg_write_reg_wait(struct amdgpu_device *adev,
364                                   uint32_t reg0, uint32_t reg1,
365                                   uint32_t ref, uint32_t mask);
366 int amdgpu_mes_set_shader_debugger(struct amdgpu_device *adev,
367                                 uint64_t process_context_addr,
368                                 uint32_t spi_gdbg_per_vmid_cntl,
369                                 const uint32_t *tcp_watch_cntl,
370                                 uint32_t flags,
371                                 bool trap_en);
372
373 int amdgpu_mes_add_ring(struct amdgpu_device *adev, int gang_id,
374                         int queue_type, int idx,
375                         struct amdgpu_mes_ctx_data *ctx_data,
376                         struct amdgpu_ring **out);
377 void amdgpu_mes_remove_ring(struct amdgpu_device *adev,
378                             struct amdgpu_ring *ring);
379
380 uint32_t amdgpu_mes_get_aggregated_doorbell_index(struct amdgpu_device *adev,
381                                                    enum amdgpu_mes_priority_level prio);
382
383 int amdgpu_mes_ctx_alloc_meta_data(struct amdgpu_device *adev,
384                                    struct amdgpu_mes_ctx_data *ctx_data);
385 void amdgpu_mes_ctx_free_meta_data(struct amdgpu_mes_ctx_data *ctx_data);
386 int amdgpu_mes_ctx_map_meta_data(struct amdgpu_device *adev,
387                                  struct amdgpu_vm *vm,
388                                  struct amdgpu_mes_ctx_data *ctx_data);
389 int amdgpu_mes_ctx_unmap_meta_data(struct amdgpu_device *adev,
390                                    struct amdgpu_mes_ctx_data *ctx_data);
391
392 int amdgpu_mes_self_test(struct amdgpu_device *adev);
393
394 int amdgpu_mes_doorbell_process_slice(struct amdgpu_device *adev);
395
396 /*
397  * MES lock can be taken in MMU notifiers.
398  *
399  * A bit more detail about why to set no-FS reclaim with MES lock:
400  *
401  * The purpose of the MMU notifier is to stop GPU access to memory so
402  * that the Linux VM subsystem can move pages around safely. This is
403  * done by preempting user mode queues for the affected process. When
404  * MES is used, MES lock needs to be taken to preempt the queues.
405  *
406  * The MMU notifier callback entry point in the driver is
407  * amdgpu_mn_invalidate_range_start_hsa. The relevant call chain from
408  * there is:
409  * amdgpu_amdkfd_evict_userptr -> kgd2kfd_quiesce_mm ->
410  * kfd_process_evict_queues -> pdd->dev->dqm->ops.evict_process_queues
411  *
412  * The last part of the chain is a function pointer where we take the
413  * MES lock.
414  *
415  * The problem with taking locks in the MMU notifier is, that MMU
416  * notifiers can be called in reclaim-FS context. That's where the
417  * kernel frees up pages to make room for new page allocations under
418  * memory pressure. While we are running in reclaim-FS context, we must
419  * not trigger another memory reclaim operation because that would
420  * recursively reenter the reclaim code and cause a deadlock. The
421  * memalloc_nofs_save/restore calls guarantee that.
422  *
423  * In addition we also need to avoid lock dependencies on other locks taken
424  * under the MES lock, for example reservation locks. Here is a possible
425  * scenario of a deadlock:
426  * Thread A: takes and holds reservation lock | triggers reclaim-FS |
427  * MMU notifier | blocks trying to take MES lock
428  * Thread B: takes and holds MES lock | blocks trying to take reservation lock
429  *
430  * In this scenario Thread B gets involved in a deadlock even without
431  * triggering a reclaim-FS operation itself.
432  * To fix this and break the lock dependency chain you'd need to either:
433  * 1. protect reservation locks with memalloc_nofs_save/restore, or
434  * 2. avoid taking reservation locks under the MES lock.
435  *
436  * Reservation locks are taken all over the kernel in different subsystems, we
437  * have no control over them and their lock dependencies.So the only workable
438  * solution is to avoid taking other locks under the MES lock.
439  * As a result, make sure no reclaim-FS happens while holding this lock anywhere
440  * to prevent deadlocks when an MMU notifier runs in reclaim-FS context.
441  */
442 static inline void amdgpu_mes_lock(struct amdgpu_mes *mes)
443 {
444         mutex_lock(&mes->mutex_hidden);
445         mes->saved_flags = memalloc_noreclaim_save();
446 }
447
448 static inline void amdgpu_mes_unlock(struct amdgpu_mes *mes)
449 {
450         memalloc_noreclaim_restore(mes->saved_flags);
451         mutex_unlock(&mes->mutex_hidden);
452 }
453 #endif /* __AMDGPU_MES_H__ */
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