drivers/char/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/delay.h>
   8
   9 /** File pointer type */
  10 #define DRMFILE                         struct file *
  11 /** Ioctl arguments */
  12 #define DRM_IOCTL_ARGS                  struct inode *inode, struct file *filp, unsigned int cmd, unsigned long data
  13 #define DRM_ERR(d)                      -(d)
  14 /** Current process ID */
  15 #define DRM_CURRENTPID                  current->pid
  16 #define DRM_UDELAY(d)                   udelay(d)
  17 /** Read a byte from a MMIO region */
  18 #define DRM_READ8(map, offset)          readb(((void __iomem *)(map)->handle) + (offset))
  19 /** Read a word from a MMIO region */
  20 #define DRM_READ16(map, offset)         readw(((void __iomem *)(map)->handle) + (offset))
  21 /** Read a dword from a MMIO region */
  22 #define DRM_READ32(map, offset)         readl(((void __iomem *)(map)->handle) + (offset))
  23 /** Write a byte into a MMIO region */
  24 #define DRM_WRITE8(map, offset, val)    writeb(val, ((void __iomem *)(map)->handle) + (offset))
  25 /** Write a word into a MMIO region */
  26 #define DRM_WRITE16(map, offset, val)   writew(val, ((void __iomem *)(map)->handle) + (offset))
  27 /** Write a dword into a MMIO region */
  28 #define DRM_WRITE32(map, offset, val)   writel(val, ((void __iomem *)(map)->handle) + (offset))
  29 /** Read memory barrier */
  30 #define DRM_READMEMORYBARRIER()         rmb()
  31 /** Write memory barrier */
  32 #define DRM_WRITEMEMORYBARRIER()        wmb()
  33 /** Read/write memory barrier */
  34 #define DRM_MEMORYBARRIER()             mb()
  35 /** DRM device local declaration */
  36 #define DRM_DEVICE      drm_file_t      *priv   = filp->private_data; \
  37                         drm_device_t    *dev    = priv->head->dev
  38
  39 /** IRQ handler arguments and return type and values */
  40 #define DRM_IRQ_ARGS            int irq, void *arg, struct pt_regs *regs
  41
  42 /** AGP types */
  43 #if __OS_HAS_AGP
  44 #define DRM_AGP_MEM             struct agp_memory
  45 #define DRM_AGP_KERN            struct agp_kern_info
  46 #else
  47 /* define some dummy types for non AGP supporting kernels */
  48 struct no_agp_kern {
  49         unsigned long aper_base;
  50         unsigned long aper_size;
  51 };
  52 #define DRM_AGP_MEM             int
  53 #define DRM_AGP_KERN            struct no_agp_kern
  54 #endif
  55
  56 #if !(__OS_HAS_MTRR)
  57 static __inline__ int mtrr_add(unsigned long base, unsigned long size,
  58                                unsigned int type, char increment)
  59 {
  60         return -ENODEV;
  61 }
  62
  63 static __inline__ int mtrr_del(int reg, unsigned long base, unsigned long size)
  64 {
  65         return -ENODEV;
  66 }
  67
  68 #define MTRR_TYPE_WRCOMB     1
  69
  70 #endif
  71
  72 /** Task queue handler arguments */
  73 #define DRM_TASKQUEUE_ARGS      void *arg
  74
  75 /** For data going into the kernel through the ioctl argument */
  76 #define DRM_COPY_FROM_USER_IOCTL(arg1, arg2, arg3)      \
  77         if ( copy_from_user(&arg1, arg2, arg3) )        \
  78                 return -EFAULT
  79 /** For data going from the kernel through the ioctl argument */
  80 #define DRM_COPY_TO_USER_IOCTL(arg1, arg2, arg3)        \
  81         if ( copy_to_user(arg1, &arg2, arg3) )          \
  82                 return -EFAULT
  83 /** Other copying of data to kernel space */
  84 #define DRM_COPY_FROM_USER(arg1, arg2, arg3)            \
  85         copy_from_user(arg1, arg2, arg3)
  86 /** Other copying of data from kernel space */
  87 #define DRM_COPY_TO_USER(arg1, arg2, arg3)              \
  88         copy_to_user(arg1, arg2, arg3)
  89 /* Macros for copyfrom user, but checking readability only once */
  90 #define DRM_VERIFYAREA_READ( uaddr, size )              \
  91         (access_ok( VERIFY_READ, uaddr, size ) ? 0 : -EFAULT)
  92 #define DRM_COPY_FROM_USER_UNCHECKED(arg1, arg2, arg3)  \
  93         __copy_from_user(arg1, arg2, arg3)
  94 #define DRM_COPY_TO_USER_UNCHECKED(arg1, arg2, arg3)    \
  95         __copy_to_user(arg1, arg2, arg3)
  96 #define DRM_GET_USER_UNCHECKED(val, uaddr)              \
  97         __get_user(val, uaddr)
  98
  99 #define DRM_GET_PRIV_WITH_RETURN(_priv, _filp) _priv = _filp->private_data
 100
 101 /**
 102  * Get the pointer to the SAREA.
 103  *
 104  * Searches the SAREA on the mapping lists and points drm_device::sarea to it.
 105  */
 106 #define DRM_GETSAREA()                                                   \
 107 do {                                                                     \
 108         drm_map_list_t *entry;                                           \
 109         list_for_each_entry( entry, &dev->maplist->head, head ) {        \
 110                 if ( entry->map &&                                       \
 111                      entry->map->type == _DRM_SHM &&                     \
 112                      (entry->map->flags & _DRM_CONTAINS_LOCK) ) {        \
 113                         dev_priv->sarea = entry->map;                    \
 114                         break;                                           \
 115                 }                                                        \
 116         }                                                                \
 117 } while (0)
 118
 119 #define DRM_HZ HZ
 120
 121 #define DRM_WAIT_ON( ret, queue, timeout, condition )           \
 122 do {                                                            \
 123         DECLARE_WAITQUEUE(entry, current);                      \
 124         unsigned long end = jiffies + (timeout);                \
 125         add_wait_queue(&(queue), &entry);                       \
 126                                                                 \
 127         for (;;) {                                              \
 128                 __set_current_state(TASK_INTERRUPTIBLE);        \
 129                 if (condition)                                  \
 130                         break;                                  \
 131                 if (time_after_eq(jiffies, end)) {              \
 132                         ret = -EBUSY;                           \
 133                         break;                                  \
 134                 }                                               \
 135                 schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);    \
 136                 if (signal_pending(current)) {                  \
 137                         ret = -EINTR;                           \
 138                         break;                                  \
 139                 }                                               \
 140         }                                                       \
 141         __set_current_state(TASK_RUNNING);                      \
 142         remove_wait_queue(&(queue), &entry);                    \
 143 } while (0)
 144
 145 #define DRM_WAKEUP( queue ) wake_up_interruptible( queue )
 146 #define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )