include/drm/drm_os_linux.h

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