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