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Current File : /lib/modules/3.10.0-1160.119.1.el7.x86_64/source/include/drm/drm_os_linux.h
/* SPDX-License-Identifier: GPL-2.0 */
/**
* \file drm_os_linux.h
* OS abstraction macros.
*/
#include <linux/interrupt.h> /* For task queue support */
#include <linux/sched/signal.h>
#include <linux/delay.h>
#include <asm-generic/io-64-nonatomic-lo-hi.h>
/** Current process ID */
#define DRM_CURRENTPID task_pid_nr(current)
#define DRM_UDELAY(d) udelay(d)
/** Read a byte from a MMIO region */
#define DRM_READ8(map, offset) readb(((void __iomem *)(map)->handle) + (offset))
/** Read a word from a MMIO region */
#define DRM_READ16(map, offset) readw(((void __iomem *)(map)->handle) + (offset))
/** Read a dword from a MMIO region */
#define DRM_READ32(map, offset) readl(((void __iomem *)(map)->handle) + (offset))
/** Write a byte into a MMIO region */
#define DRM_WRITE8(map, offset, val) writeb(val, ((void __iomem *)(map)->handle) + (offset))
/** Write a word into a MMIO region */
#define DRM_WRITE16(map, offset, val) writew(val, ((void __iomem *)(map)->handle) + (offset))
/** Write a dword into a MMIO region */
#define DRM_WRITE32(map, offset, val) writel(val, ((void __iomem *)(map)->handle) + (offset))
/** Read a qword from a MMIO region - be careful using these unless you really understand them */
#define DRM_READ64(map, offset) readq(((void __iomem *)(map)->handle) + (offset))
/** Write a qword into a MMIO region */
#define DRM_WRITE64(map, offset, val) writeq(val, ((void __iomem *)(map)->handle) + (offset))
#define DRM_WAIT_ON( ret, queue, timeout, condition ) \
do { \
DECLARE_WAITQUEUE(entry, current); \
unsigned long end = jiffies + (timeout); \
add_wait_queue(&(queue), &entry); \
\
for (;;) { \
__set_current_state(TASK_INTERRUPTIBLE); \
if (condition) \
break; \
if (time_after_eq(jiffies, end)) { \
ret = -EBUSY; \
break; \
} \
schedule_timeout((HZ/100 > 1) ? HZ/100 : 1); \
if (signal_pending(current)) { \
ret = -EINTR; \
break; \
} \
} \
__set_current_state(TASK_RUNNING); \
remove_wait_queue(&(queue), &entry); \
} while (0)