LXR linux/include/drm/drm_os

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/**
   3 * \file drm_os_linux.h
   4 * OS abstraction macros.
   5 */
   6
   7#include <linux/interrupt.h>    /* For task queue support */
   8#include <linux/sched/signal.h>
   9#include <linux/delay.h>
  10#include <linux/io-64-nonatomic-lo-hi.h>
  11
  12/** Current process ID */
  13#define DRM_CURRENTPID                  task_pid_nr(current)
  14#define DRM_UDELAY(d)                   udelay(d)
  15/** Read a byte from a MMIO region */
  16#define DRM_READ8(map, offset)          readb(((void __iomem *)(map)->handle) + (offset))
  17/** Read a word from a MMIO region */
  18#define DRM_READ16(map, offset)         readw(((void __iomem *)(map)->handle) + (offset))
  19/** Read a dword from a MMIO region */
  20#define DRM_READ32(map, offset)         readl(((void __iomem *)(map)->handle) + (offset))
  21/** Write a byte into a MMIO region */
  22#define DRM_WRITE8(map, offset, val)    writeb(val, ((void __iomem *)(map)->handle) + (offset))
  23/** Write a word into a MMIO region */
  24#define DRM_WRITE16(map, offset, val)   writew(val, ((void __iomem *)(map)->handle) + (offset))
  25/** Write a dword into a MMIO region */
  26#define DRM_WRITE32(map, offset, val)   writel(val, ((void __iomem *)(map)->handle) + (offset))
  27
  28/** Read a qword from a MMIO region - be careful using these unless you really understand them */
  29#define DRM_READ64(map, offset)         readq(((void __iomem *)(map)->handle) + (offset))
  30/** Write a qword into a MMIO region */
  31#define DRM_WRITE64(map, offset, val)   writeq(val, ((void __iomem *)(map)->handle) + (offset))
  32
  33#define DRM_WAIT_ON( ret, queue, timeout, condition )           \
  34do {                                                            \
  35        DECLARE_WAITQUEUE(entry, current);                      \
  36        unsigned long end = jiffies + (timeout);                \
  37        add_wait_queue(&(queue), &entry);                       \
  38                                                                \
  39        for (;;) {                                              \
  40                __set_current_state(TASK_INTERRUPTIBLE);        \
  41                if (condition)                                  \
  42                        break;                                  \
  43                if (time_after_eq(jiffies, end)) {              \
  44                        ret = -EBUSY;                           \
  45                        break;                                  \
  46                }                                               \
  47                schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);    \
  48                if (signal_pending(current)) {                  \
  49                        ret = -EINTR;                           \
  50                        break;                                  \
  51                }                                               \
  52        }                                                       \
  53        __set_current_state(TASK_RUNNING);                      \
  54        remove_wait_queue(&(queue), &entry);                    \
  55} while (0)
  56