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 20struct host1x; 21 22/* Reserved for replacing an expired wait with a NOP */ 23#define HOST1X_SYNCPT_RESERVED 0 24 25struct host1x_syncpt_base { 26 unsigned int id; 27 bool requested; 28}; 29 30struct 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 */ 54int host1x_syncpt_init(struct host1x *host); 55 56/* Free sync point array */ 57void host1x_syncpt_deinit(struct host1x *host); 58 59/* Return number of sync point supported. */ 60unsigned int host1x_syncpt_nb_pts(struct host1x *host); 61 62/* Return number of wait bases supported. */ 63unsigned int host1x_syncpt_nb_bases(struct host1x *host); 64 65/* Return number of mlocks supported. */ 66unsigned 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 * */ 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. */ 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 */ 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. */ 103u32 host1x_syncpt_load(struct host1x_syncpt *sp); 104 105/* Check if the given syncpoint value has already passed */ 106bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh); 107 108/* Save host1x sync point state into shadow registers. */ 109void host1x_syncpt_save(struct host1x *host); 110 111/* Reset host1x sync point state from shadow registers. */ 112void host1x_syncpt_restore(struct host1x *host); 113 114/* Read current wait base value into shadow register and return it. */ 115u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp); 116 117/* Indicate future operations by incrementing the sync point max. */ 118u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs); 119 120/* Check if sync point id is valid. */ 121static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp) 122{ 123 return sp->id < host1x_syncpt_nb_pts(sp->host); 124} 125 126static inline void host1x_syncpt_set_locked(struct host1x_syncpt *sp) 127{ 128 sp->locked = true; 129} 130 131#endif 132