drivers/char/drm/drm_os_linux.h

   1 /**
   2  * \file drm_os_linux.h
   3  * OS abstraction macros.
   4  */
   5
   6
   7 #include <linux/interrupt.h>    /* For task queue support */
   8 #include <linux/delay.h>
   9
  10 /** File pointer type */
  11 #define DRMFILE                         struct file *
  12 /** Ioctl arguments */
  13 #define DRM_IOCTL_ARGS                  struct inode *inode, struct file *filp, unsigned int cmd, unsigned long data
  14 #define DRM_ERR(d)                      -(d)
  15 /** Current process ID */
  16 #define DRM_CURRENTPID                  current->pid
  17 #define DRM_UDELAY(d)                   udelay(d)
  18 /** Read a byte from a MMIO region */
  19 #define DRM_READ8(map, offset)          readb(((unsigned long)(map)->handle) + (offset))
  20 /** Read a dword from a MMIO region */
  21 #define DRM_READ32(map, offset)         readl(((unsigned long)(map)->handle) + (offset))
  22 /** Write a byte into a MMIO region */
  23 #define DRM_WRITE8(map, offset, val)    writeb(val, ((unsigned long)(map)->handle) + (offset))
  24 /** Write a dword into a MMIO region */
  25 #define DRM_WRITE32(map, offset, val)   writel(val, ((unsigned long)(map)->handle) + (offset))
  26 /** Read memory barrier */
  27 #define DRM_READMEMORYBARRIER()         rmb()
  28 /** Write memory barrier */
  29 #define DRM_WRITEMEMORYBARRIER()        wmb()
  30 /** Read/write memory barrier */
  31 #define DRM_MEMORYBARRIER()             mb()
  32 /** DRM device local declaration */
  33 #define DRM_DEVICE      drm_file_t      *priv   = filp->private_data; \
  34                         drm_device_t    *dev    = priv->dev
  35
  36 /** IRQ handler arguments and return type and values */
  37 #define DRM_IRQ_ARGS            int irq, void *arg, struct pt_regs *regs
  38
  39 /** AGP types */
  40 #define DRM_AGP_MEM             struct agp_memory
  41 #define DRM_AGP_KERN            struct agp_kern_info
  42
  43 /** Task queue handler arguments */
  44 #define DRM_TASKQUEUE_ARGS      void *arg
  45
  46 /** For data going into the kernel through the ioctl argument */
  47 #define DRM_COPY_FROM_USER_IOCTL(arg1, arg2, arg3)      \
  48         if ( copy_from_user(&arg1, arg2, arg3) )        \
  49                 return -EFAULT
  50 /** For data going from the kernel through the ioctl argument */
  51 #define DRM_COPY_TO_USER_IOCTL(arg1, arg2, arg3)        \
  52         if ( copy_to_user(arg1, &arg2, arg3) )          \
  53                 return -EFAULT
  54 /** Other copying of data to kernel space */
  55 #define DRM_COPY_FROM_USER(arg1, arg2, arg3)            \
  56         copy_from_user(arg1, arg2, arg3)
  57 /** Other copying of data from kernel space */
  58 #define DRM_COPY_TO_USER(arg1, arg2, arg3)              \
  59         copy_to_user(arg1, arg2, arg3)
  60 /* Macros for copyfrom user, but checking readability only once */
  61 #define DRM_VERIFYAREA_READ( uaddr, size )              \
  62         verify_area( VERIFY_READ, uaddr, size )
  63 #define DRM_COPY_FROM_USER_UNCHECKED(arg1, arg2, arg3)  \
  64         __copy_from_user(arg1, arg2, arg3)
  65 #define DRM_COPY_TO_USER_UNCHECKED(arg1, arg2, arg3)    \
  66         __copy_to_user(arg1, arg2, arg3)
  67 #define DRM_GET_USER_UNCHECKED(val, uaddr)              \
  68         __get_user(val, uaddr)
  69 #define DRM_PUT_USER_UNCHECKED(uaddr, val)              \
  70         __put_user(val, uaddr)
  71
  72
  73 /** 'malloc' without the overhead of DRM(alloc)() */
  74 #define DRM_MALLOC(x) kmalloc(x, GFP_KERNEL)
  75 /** 'free' without the overhead of DRM(free)() */
  76 #define DRM_FREE(x,size) kfree(x)
  77
  78 #define DRM_GET_PRIV_WITH_RETURN(_priv, _filp) _priv = _filp->private_data
  79
  80 /**
  81  * Get the pointer to the SAREA.
  82  *
  83  * Searches the SAREA on the mapping lists and points drm_device::sarea to it.
  84  */
  85 #define DRM_GETSAREA()                                                   \
  86 do {                                                                     \
  87         drm_map_list_t *entry;                                           \
  88         list_for_each_entry( entry, &dev->maplist->head, head ) {        \
  89                 if ( entry->map &&                                       \
  90                      entry->map->type == _DRM_SHM &&                     \
  91                      (entry->map->flags & _DRM_CONTAINS_LOCK) ) {        \
  92                         dev_priv->sarea = entry->map;                    \
  93                         break;                                           \
  94                 }                                                        \
  95         }                                                                \
  96 } while (0)
  97
  98 #define DRM_HZ HZ
  99
 100 #define DRM_WAIT_ON( ret, queue, timeout, condition )           \
 101 do {                                                            \
 102         DECLARE_WAITQUEUE(entry, current);                      \
 103         unsigned long end = jiffies + (timeout);                \
 104         add_wait_queue(&(queue), &entry);                       \
 105                                                                 \
 106         for (;;) {                                              \
 107                 current->state = TASK_INTERRUPTIBLE;            \
 108                 if (condition)                                  \
 109                         break;                                  \
 110                 if (time_after_eq(jiffies, end)) {              \
 111                         ret = -EBUSY;                           \
 112                         break;                                  \
 113                 }                                               \
 114                 schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);    \
 115                 if (signal_pending(current)) {                  \
 116                         ret = -EINTR;                           \
 117                         break;                                  \
 118                 }                                               \
 119         }                                                       \
 120         current->state = TASK_RUNNING;                          \
 121         remove_wait_queue(&(queue), &entry);                    \
 122 } while (0)
 123
 124
 125 #define DRM_WAKEUP( queue ) wake_up_interruptible( queue )
 126 #define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )
 127