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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   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 /* Delay based on GPU time (ie. PTIMER).
  32  *
  33  * Will return -ETIMEDOUT unless the loop was terminated with 'break',
  34  * where it will return the number of nanoseconds taken instead.
  35  *
  36  * NVKM_DELAY can be passed for 'cond' to disable the timeout warning,
  37  * which is useful for unconditional delay loops.
  38  */
  39 #define NVKM_DELAY _warn = false;
  40 #define nvkm_nsec(d,n,cond...) ({                                              \
  41         struct nvkm_device *_device = (d);                                     \
  42         struct nvkm_timer *_tmr = _device->timer;                              \
  43         u64 _nsecs = (n), _time0 = nvkm_timer_read(_tmr);                      \
  44         s64 _taken = 0;                                                        \
  45         bool _warn = true;                                                     \
  46                                                                                \
  47         do {                                                                   \
  48                 cond                                                           \
  49         } while (_taken = nvkm_timer_read(_tmr) - _time0, _taken < _nsecs);    \
  50                                                                                \
  51         if (_taken >= _nsecs) {                                                \
  52                 if (_warn)                                                     \
  53                         dev_WARN(_device->dev, "timeout\n");                   \
  54                 _taken = -ETIMEDOUT;                                           \
  55         }                                                                      \
  56         _taken;                                                                \
  57 })
  58 #define nvkm_usec(d,u,cond...) nvkm_nsec((d), (u) * 1000, ##cond)
  59 #define nvkm_msec(d,m,cond...) nvkm_usec((d), (m) * 1000, ##cond)
  60
  61 #define nvkm_wait_nsec(d,n,addr,mask,data)                                     \
  62         nvkm_nsec(d, n,                                                        \
  63                 if ((nvkm_rd32(d, (addr)) & (mask)) == (data))                 \
  64                         break;                                                 \
  65                 )
  66 #define nvkm_wait_usec(d,u,addr,mask,data)                                     \
  67         nvkm_wait_nsec((d), (u) * 1000, (addr), (mask), (data))
  68 #define nvkm_wait_msec(d,m,addr,mask,data)                                     \
  69         nvkm_wait_usec((d), (m) * 1000, (addr), (mask), (data))
  70
  71 int nv04_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
  72 int nv40_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
  73 int nv41_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
  74 int gk20a_timer_new(struct nvkm_device *, int, struct nvkm_timer **);
  75 #endif