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/*
* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __NVGPU_TIMERS_H__
#define __NVGPU_TIMERS_H__
#include <nvgpu/types.h>
struct gk20a;
/*
* struct nvgpu_timeout - define a timeout.
*
* There are two types of timer suported:
*
* o NVGPU_TIMER_CPU_TIMER
* Timer uses the CPU to measure the timeout.
*
* o NVGPU_TIMER_RETRY_TIMER
* Instead of measuring a time limit keep track of the number of times
* something has been attempted. After said limit, "expire" the timer.
*
* Available flags:
*
* o NVGPU_TIMER_NO_PRE_SI
* By default when the system is not running on silicon the timeout
* code will ignore the requested timeout. Specifying this flag will
* override that behavior and honor the timeout regardless of platform.
*
* o NVGPU_TIMER_SILENT_TIMEOUT
* Do not print any messages on timeout. Normally a simple message is
* printed that specifies where the timeout occurred.
*/
struct nvgpu_timeout {
struct gk20a *g;
unsigned int flags;
union {
s64 time;
struct {
int max;
int attempted;
} retries;
};
};
/*
* Bit 0 specifies the type of timer: CPU or retry.
*/
#define NVGPU_TIMER_CPU_TIMER (0x0)
#define NVGPU_TIMER_RETRY_TIMER (0x1)
/*
* Bits 1 through 7 are reserved; bits 8 and up are flags:
*/
#define NVGPU_TIMER_NO_PRE_SI (0x1 << 8)
#define NVGPU_TIMER_SILENT_TIMEOUT (0x1 << 9)
#define NVGPU_TIMER_FLAG_MASK (NVGPU_TIMER_RETRY_TIMER | \
NVGPU_TIMER_NO_PRE_SI | \
NVGPU_TIMER_SILENT_TIMEOUT)
int nvgpu_timeout_init(struct gk20a *g, struct nvgpu_timeout *timeout,
int duration, unsigned long flags);
int nvgpu_timeout_peek_expired(struct nvgpu_timeout *timeout);
#define nvgpu_timeout_expired(__timeout) \
__nvgpu_timeout_expired_msg(__timeout, (void *)_THIS_IP_, "")
#define nvgpu_timeout_expired_msg(__timeout, fmt, args...) \
__nvgpu_timeout_expired_msg(__timeout, (void *)_THIS_IP_, \
fmt, ##args)
/*
* Don't use this directly.
*/
int __nvgpu_timeout_expired_msg(struct nvgpu_timeout *timeout,
void *caller, const char *fmt, ...);
/*
* Waits and delays.
*/
void nvgpu_msleep(unsigned int msecs);
void nvgpu_usleep_range(unsigned int min_us, unsigned int max_us);
void nvgpu_udelay(unsigned int usecs);
/*
* Timekeeping.
*/
s64 nvgpu_current_time_ms(void);
#endif
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