linux-core/drm_os_linux.h

   1 /**
   2  * \file drm_os_linux.h
   3  * OS abstraction macros.
   4  */
   5
   6 #define __NO_VERSION__
   7
   8 #include <linux/interrupt.h>    /* For task queue support */
   9 #include <linux/delay.h>
  10
  11 /** File pointer type */
  12 #define DRMFILE                         struct file *
  13 /** Ioctl arguments */
  14 #define DRM_IOCTL_ARGS                  struct inode *inode, struct file *filp, unsigned int cmd, unsigned long data
  15 #define DRM_ERR(d)                      -(d)
  16 /** Current process ID */
  17 #define DRM_CURRENTPID                  current->pid
  18 #define DRM_UDELAY(d)                   udelay(d)
  19 /** Read a byte from a MMIO region */
  20 #define DRM_READ8(map, offset)          readb(((unsigned long)(map)->handle) + (offset))
  21 /** Read a dword from a MMIO region */
  22 #define DRM_READ32(map, offset)         readl(((unsigned long)(map)->handle) + (offset))
  23 /** Write a byte into a MMIO region */
  24 #define DRM_WRITE8(map, offset, val)    writeb(val, ((unsigned long)(map)->handle) + (offset))
  25 /** Write a dword into a MMIO region */
  26 #define DRM_WRITE32(map, offset, val)   writel(val, ((unsigned long)(map)->handle) + (offset))
  27 /** Read memory barrier */
  28 #define DRM_READMEMORYBARRIER()         rmb()
  29 /** Write memory barrier */
  30 #define DRM_WRITEMEMORYBARRIER()        wmb()
  31 /** Read/write memory barrier */
  32 #define DRM_MEMORYBARRIER()             mb()
  33 /** DRM device local declaration */
  34 #define DRM_DEVICE      drm_file_t      *priv   = filp->private_data; \
  35                         drm_device_t    *dev    = priv->dev
  36
  37 /** IRQ handler arguments */
  38 #define DRM_IRQ_ARGS            int irq, void *arg, struct pt_regs *regs
  39 /** Task queue handler arguments */
  40 #define DRM_TASKQUEUE_ARGS      void *arg
  41
  42 /** For data going into the kernel through the ioctl argument */
  43 #define DRM_COPY_FROM_USER_IOCTL(arg1, arg2, arg3)      \
  44         if ( copy_from_user(&arg1, arg2, arg3) )        \
  45                 return -EFAULT
  46 /** For data going from the kernel through the ioctl argument */
  47 #define DRM_COPY_TO_USER_IOCTL(arg1, arg2, arg3)        \
  48         if ( copy_to_user(arg1, &arg2, arg3) )          \
  49                 return -EFAULT
  50 /** Other copying of data to kernel space */
  51 #define DRM_COPY_FROM_USER(arg1, arg2, arg3)            \
  52         copy_from_user(arg1, arg2, arg3)
  53 /** Other copying of data from kernel space */
  54 #define DRM_COPY_TO_USER(arg1, arg2, arg3)              \
  55         copy_to_user(arg1, arg2, arg3)
  56 /* Macros for copyfrom user, but checking readability only once */
  57 #define DRM_VERIFYAREA_READ( uaddr, size )              \
  58         verify_area( VERIFY_READ, uaddr, size )
  59 #define DRM_COPY_FROM_USER_UNCHECKED(arg1, arg2, arg3)  \
  60         __copy_from_user(arg1, arg2, arg3)
  61 #define DRM_GET_USER_UNCHECKED(val, uaddr)              \
  62         __get_user(val, uaddr)
  63
  64
  65 /** 'malloc' without the overhead of DRM(alloc)() */
  66 #define DRM_MALLOC(x) kmalloc(x, GFP_KERNEL)
  67 /** 'free' without the overhead of DRM(free)() */
  68 #define DRM_FREE(x,size) kfree(x)
  69
  70 /**
  71  * Get the pointer to the SAREA.
  72  *
  73  * Searches the SAREA on the mapping lists and points drm_device::sarea to it.
  74  */
  75 #define DRM_GETSAREA()                                                   \
  76 do {                                                                     \
  77         drm_map_list_t *entry;                                           \
  78         list_for_each_entry( entry, &dev->maplist->head, head ) {        \
  79                 if ( entry->map &&                                       \
  80                      entry->map->type == _DRM_SHM &&                     \
  81                      (entry->map->flags & _DRM_CONTAINS_LOCK) ) {        \
  82                         dev_priv->sarea = entry->map;                    \
  83                         break;                                           \
  84                 }                                                        \
  85         }                                                                \
  86 } while (0)
  87
  88 #define DRM_HZ HZ
  89
  90 #define DRM_WAIT_ON( ret, queue, timeout, condition )           \
  91 do {                                                            \
  92         DECLARE_WAITQUEUE(entry, current);                      \
  93         unsigned long end = jiffies + (timeout);                \
  94         add_wait_queue(&(queue), &entry);                       \
  95                                                                 \
  96         for (;;) {                                              \
  97                 current->state = TASK_INTERRUPTIBLE;            \
  98                 if (condition)                                  \
  99                         break;                                  \
 100                 if (time_after_eq(jiffies, end)) {              \
 101                         ret = -EBUSY;                           \
 102                         break;                                  \
 103                 }                                               \
 104                 schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);    \
 105                 if (signal_pending(current)) {                  \
 106                         ret = -EINTR;                           \
 107                         break;                                  \
 108                 }                                               \
 109         }                                                       \
 110         current->state = TASK_RUNNING;                          \
 111         remove_wait_queue(&(queue), &entry);                    \
 112 } while (0)
 113
 114
 115 #define DRM_WAKEUP( queue ) wake_up_interruptible( queue )
 116 #define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )
 117