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

   1 #ifndef __NVKM_TIMER_H__
   2 #define __NVKM_TIMER_H__
   3 #include <core/subdev.h>
   4
   5 struct nvkm_alarm {
   6         struct list_head head;
   7         u64 timestamp;
   8         void (*func)(struct nvkm_alarm *);
   9 };
  10
  11 static inline void
  12 nvkm_alarm_init(struct nvkm_alarm *alarm, void (*func)(struct nvkm_alarm *))
  13 {
  14         INIT_LIST_HEAD(&alarm->head);
  15         alarm->func = func;
  16 }
  17
  18 struct nvkm_timer {
  19         const struct nvkm_timer_func *func;
  20         struct nvkm_subdev subdev;
  21
  22         struct list_head alarms;
  23         spinlock_t lock;
  24 };
  25
  26 u64 nvkm_timer_read(struct nvkm_timer *);
  27 void nvkm_timer_alarm(struct nvkm_timer *, u32 nsec, struct nvkm_alarm *);
  28 void nvkm_timer_alarm_cancel(struct nvkm_timer *, struct nvkm_alarm *);
  29
  30 /* Delay based on GPU time (ie. PTIMER).
  31  *
  32  * Will return -ETIMEDOUT unless the loop was terminated with 'break',
  33  * where it will return the number of nanoseconds taken instead.
  34  *
  35  * NVKM_DELAY can be passed for 'cond' to disable the timeout warning,
  36  * which is useful for unconditional delay loops.
  37  */
  38 #define NVKM_DELAY _warn = false;
  39 #define nvkm_nsec(d,n,cond...) ({                                              \
  40         struct nvkm_device *_device = (d);                                     \
  41         struct nvkm_timer *_tmr = _device->timer;                              \
  42         u64 _nsecs = (n), _time0 = nvkm_timer_read(_tmr);                      \
  43         s64 _taken = 0;                                                        \
  44         bool _warn = true;                                                     \
  45                                                                                \
  46         do {                                                                   \
  47                 cond                                                           \
  48         } while (_taken = nvkm_timer_read(_tmr) - _time0, _taken < _nsecs);    \
  49                                                                                \
  50         if (_taken >= _nsecs) {                                                \
  51                 if (_warn) {                                                   \
  52                         dev_warn(_device->dev, "timeout at %s:%d/%s()!\n",     \
  53                                  __FILE__, __LINE__, __func__);                \
  54                 }                                                              \
  55                 _taken = -ETIMEDOUT;                                           \
  56         }                                                                      \
  57         _taken;                                                                \
  58 })
  59 #define nvkm_usec(d,u,cond...) nvkm_nsec((d), (u) * 1000, ##cond)
  60 #define nvkm_msec(d,m,cond...) nvkm_usec((d), (m) * 1000, ##cond)
  61
  62 #define nvkm_wait_nsec(d,n,addr,mask,data)                                     \
  63         nvkm_nsec(d, n,                                                        \
  64                 if ((nvkm_rd32(d, (addr)) & (mask)) == (data))                 \
  65                         break;                                                 \
  66                 )
  67 #define nvkm_wait_usec(d,u,addr,mask,data)                                     \
  68         nvkm_wait_nsec((d), (u) * 1000, (addr), (mask), (data))
  69 #define nvkm_wait_msec(d,m,addr,mask,data)                                     \
  70         nvkm_wait_usec((d), (m) * 1000, (addr), (mask), (data))
  71
  72 int nv04_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
  73 int nv40_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
  74 int nv41_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
  75 int gk20a_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
  76 #endif