1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Tegra host1x Syncpoints 4 * 5 * Copyright (c) 2010-2013, NVIDIA Corporation. 6 */ 7 8 #ifndef __HOST1X_SYNCPT_H 9 #define __HOST1X_SYNCPT_H 10 11 #include <linux/atomic.h> 12 #include <linux/host1x.h> 13 #include <linux/kernel.h> 14 #include <linux/kref.h> 15 #include <linux/sched.h> 16 17 #include "fence.h" 18 #include "intr.h" 19 20 struct host1x; 21 22 /* Reserved for replacing an expired wait with a NOP */ 23 #define HOST1X_SYNCPT_RESERVED 0 24 25 struct host1x_syncpt_base { 26 unsigned int id; 27 bool requested; 28 }; 29 30 struct host1x_syncpt { 31 struct kref ref; 32 33 unsigned int id; 34 atomic_t min_val; 35 atomic_t max_val; 36 u32 base_val; 37 const char *name; 38 bool client_managed; 39 struct host1x *host; 40 struct host1x_syncpt_base *base; 41 42 /* interrupt data */ 43 struct host1x_fence_list fences; 44 45 /* 46 * If a submission incrementing this syncpoint fails, lock it so that 47 * further submission cannot be made until application has handled the 48 * failure. 49 */ 50 bool locked; 51 }; 52 53 /* Initialize sync point array */ 54 int host1x_syncpt_init(struct host1x *host); 55 56 /* Free sync point array */ 57 void host1x_syncpt_deinit(struct host1x *host); 58 59 /* Return number of sync point supported. */ 60 unsigned int host1x_syncpt_nb_pts(struct host1x *host); 61 62 /* Return number of wait bases supported. */ 63 unsigned int host1x_syncpt_nb_bases(struct host1x *host); 64 65 /* Return number of mlocks supported. */ 66 unsigned int host1x_syncpt_nb_mlocks(struct host1x *host); 67 68 /* 69 * Check sync point sanity. If max is larger than min, there have too many 70 * sync point increments. 71 * 72 * Client managed sync point are not tracked. 73 * */ host1x_syncpt_check_max(struct host1x_syncpt * sp,u32 real)74static inline bool host1x_syncpt_check_max(struct host1x_syncpt *sp, u32 real) 75 { 76 u32 max; 77 if (sp->client_managed) 78 return true; 79 max = host1x_syncpt_read_max(sp); 80 return (s32)(max - real) >= 0; 81 } 82 83 /* Return true if sync point is client managed. */ host1x_syncpt_client_managed(struct host1x_syncpt * sp)84static inline bool host1x_syncpt_client_managed(struct host1x_syncpt *sp) 85 { 86 return sp->client_managed; 87 } 88 89 /* 90 * Returns true if syncpoint min == max, which means that there are no 91 * outstanding operations. 92 */ host1x_syncpt_idle(struct host1x_syncpt * sp)93static inline bool host1x_syncpt_idle(struct host1x_syncpt *sp) 94 { 95 int min, max; 96 smp_rmb(); 97 min = atomic_read(&sp->min_val); 98 max = atomic_read(&sp->max_val); 99 return (min == max); 100 } 101 102 /* Load current value from hardware to the shadow register. */ 103 u32 host1x_syncpt_load(struct host1x_syncpt *sp); 104 105 /* Check if the given syncpoint value has already passed */ 106 bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh); 107 108 /* Save host1x sync point state into shadow registers. */ 109 void host1x_syncpt_save(struct host1x *host); 110 111 /* Reset host1x sync point state from shadow registers. */ 112 void host1x_syncpt_restore(struct host1x *host); 113 114 /* Read current wait base value into shadow register and return it. */ 115 u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp); 116 117 /* Indicate future operations by incrementing the sync point max. */ 118 u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs); 119 120 /* Check if sync point id is valid. */ host1x_syncpt_is_valid(struct host1x_syncpt * sp)121static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp) 122 { 123 return sp->id < host1x_syncpt_nb_pts(sp->host); 124 } 125 host1x_syncpt_set_locked(struct host1x_syncpt * sp)126static inline void host1x_syncpt_set_locked(struct host1x_syncpt *sp) 127 { 128 sp->locked = true; 129 } 130 131 #endif 132