drivers/gpu/drm/nouveau/include/nvkm/subdev/timer.h

   1 /* SPDX-License-Identifier: MIT */
   2 #ifndef __NVKM_TIMER_H__
   3 #define __NVKM_TIMER_H__
   4 #include <core/subdev.h>
   5
   6 struct nvkm_alarm {
   7         struct list_head head;
   8         struct list_head exec;
   9         u64 timestamp;
  10         void (*func)(struct nvkm_alarm *);
  11 };
  12
  13 static inline void
  14 nvkm_alarm_init(struct nvkm_alarm *alarm, void (*func)(struct nvkm_alarm *))
  15 {
  16         INIT_LIST_HEAD(&alarm->head);
  17         alarm->func = func;
  18 }
  19
  20 struct nvkm_timer {
  21         const struct nvkm_timer_func *func;
  22         struct nvkm_subdev subdev;
  23
  24         struct list_head alarms;
  25         spinlock_t lock;
  26 };
  27
  28 u64 nvkm_timer_read(struct nvkm_timer *);
  29 void nvkm_timer_alarm(struct nvkm_timer *, u32 nsec, struct nvkm_alarm *);
  30
  31 struct nvkm_timer_wait {
  32         struct nvkm_timer *tmr;
  33         u64 limit;
  34         u64 time0;
  35         u64 time1;
  36         int reads;
  37 };
  38
  39 void nvkm_timer_wait_init(struct nvkm_device *, u64 nsec,
  40                           struct nvkm_timer_wait *);
  41 s64 nvkm_timer_wait_test(struct nvkm_timer_wait *);
  42
  43 /* Delay based on GPU time (ie. PTIMER).
  44  *
  45  * Will return -ETIMEDOUT unless the loop was terminated with 'break',
  46  * where it will return the number of nanoseconds taken instead.
  47  *
  48  * NVKM_DELAY can be passed for 'cond' to disable the timeout warning,
  49  * which is useful for unconditional delay loops.
  50  */
  51 #define NVKM_DELAY _warn = false;
  52 #define nvkm_nsec(d,n,cond...) ({                                              \
  53         struct nvkm_timer_wait _wait;                                          \
  54         bool _warn = true;                                                     \
  55         s64 _taken = 0;                                                        \
  56                                                                                \
  57         nvkm_timer_wait_init((d), (n), &_wait);                                \
  58         do {                                                                   \
  59                 cond                                                           \
  60         } while ((_taken = nvkm_timer_wait_test(&_wait)) >= 0);                \
  61                                                                                \
  62         if (_warn && _taken < 0)                                               \
  63                 dev_WARN(_wait.tmr->subdev.device->dev, "timeout\n");          \
  64         _taken;                                                                \
  65 })
  66 #define nvkm_usec(d,u,cond...) nvkm_nsec((d), (u) * 1000, ##cond)
  67 #define nvkm_msec(d,m,cond...) nvkm_usec((d), (m) * 1000, ##cond)
  68
  69 #define nvkm_wait_nsec(d,n,addr,mask,data)                                     \
  70         nvkm_nsec(d, n,                                                        \
  71                 if ((nvkm_rd32(d, (addr)) & (mask)) == (data))                 \
  72                         break;                                                 \
  73                 )
  74 #define nvkm_wait_usec(d,u,addr,mask,data)                                     \
  75         nvkm_wait_nsec((d), (u) * 1000, (addr), (mask), (data))
  76 #define nvkm_wait_msec(d,m,addr,mask,data)                                     \
  77         nvkm_wait_usec((d), (m) * 1000, (addr), (mask), (data))
  78
  79 int nv04_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
  80 int nv40_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
  81 int nv41_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
  82 int gk20a_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
  83 #endif