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 and return type and values */
  38 #define DRM_IRQ_ARGS            int irq, void *arg, struct pt_regs *regs
  39 /** backwards compatibility with old irq return values */
  40 #ifndef IRQ_HANDLED
  41 typedef void irqreturn_t;
  42 #define IRQ_HANDLED   /* nothing */
  43 #define IRQ_NONE      /* nothing */
  44 #endif
  45
  46 /** AGP types */
  47 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,70)
  48 #define DRM_AGP_MEM             agp_memory
  49 #define DRM_AGP_KERN            agp_kern_info
  50 #else
  51 #define DRM_AGP_MEM             struct agp_memory
  52 #define DRM_AGP_KERN            struct agp_kern_info
  53 #endif
  54
  55 /** Task queue handler arguments */
  56 #define DRM_TASKQUEUE_ARGS      void *arg
  57
  58 /** For data going into the kernel through the ioctl argument */
  59 #define DRM_COPY_FROM_USER_IOCTL(arg1, arg2, arg3)      \
  60         if ( copy_from_user(&arg1, arg2, arg3) )        \
  61                 return -EFAULT
  62 /** For data going from the kernel through the ioctl argument */
  63 #define DRM_COPY_TO_USER_IOCTL(arg1, arg2, arg3)        \
  64         if ( copy_to_user(arg1, &arg2, arg3) )          \
  65                 return -EFAULT
  66 /** Other copying of data to kernel space */
  67 #define DRM_COPY_FROM_USER(arg1, arg2, arg3)            \
  68         copy_from_user(arg1, arg2, arg3)
  69 /** Other copying of data from kernel space */
  70 #define DRM_COPY_TO_USER(arg1, arg2, arg3)              \
  71         copy_to_user(arg1, arg2, arg3)
  72 /* Macros for copyfrom user, but checking readability only once */
  73 #define DRM_VERIFYAREA_READ( uaddr, size )              \
  74         verify_area( VERIFY_READ, uaddr, size )
  75 #define DRM_COPY_FROM_USER_UNCHECKED(arg1, arg2, arg3)  \
  76         __copy_from_user(arg1, arg2, arg3)
  77 #define DRM_GET_USER_UNCHECKED(val, uaddr)              \
  78         __get_user(val, uaddr)
  79
  80
  81 /** 'malloc' without the overhead of DRM(alloc)() */
  82 #define DRM_MALLOC(x) kmalloc(x, GFP_KERNEL)
  83 /** 'free' without the overhead of DRM(free)() */
  84 #define DRM_FREE(x,size) kfree(x)
  85
  86 #define DRM_GET_PRIV_WITH_RETURN(_priv, _filp) _priv = _filp->private_data
  87
  88 /**
  89  * Get the pointer to the SAREA.
  90  *
  91  * Searches the SAREA on the mapping lists and points drm_device::sarea to it.
  92  */
  93 #define DRM_GETSAREA()                                                   \
  94 do {                                                                     \
  95         drm_map_list_t *entry;                                           \
  96         list_for_each_entry( entry, &dev->maplist->head, head ) {        \
  97                 if ( entry->map &&                                       \
  98                      entry->map->type == _DRM_SHM &&                     \
  99                      (entry->map->flags & _DRM_CONTAINS_LOCK) ) {        \
 100                         dev_priv->sarea = entry->map;                    \
 101                         break;                                           \
 102                 }                                                        \
 103         }                                                                \
 104 } while (0)
 105
 106 #define DRM_HZ HZ
 107
 108 #define DRM_WAIT_ON( ret, queue, timeout, condition )           \
 109 do {                                                            \
 110         DECLARE_WAITQUEUE(entry, current);                      \
 111         unsigned long end = jiffies + (timeout);                \
 112         add_wait_queue(&(queue), &entry);                       \
 113                                                                 \
 114         for (;;) {                                              \
 115                 current->state = TASK_INTERRUPTIBLE;            \
 116                 if (condition)                                  \
 117                         break;                                  \
 118                 if (time_after_eq(jiffies, end)) {              \
 119                         ret = -EBUSY;                           \
 120                         break;                                  \
 121                 }                                               \
 122                 schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);    \
 123                 if (signal_pending(current)) {                  \
 124                         ret = -EINTR;                           \
 125                         break;                                  \
 126                 }                                               \
 127         }                                                       \
 128         current->state = TASK_RUNNING;                          \
 129         remove_wait_queue(&(queue), &entry);                    \
 130 } while (0)
 131
 132
 133 #define DRM_WAKEUP( queue ) wake_up_interruptible( queue )
 134 #define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )
 135