linux-core/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 word from a MMIO region */
  21 #define DRM_READ16(map, offset)         readw(((unsigned long)(map)->handle) + (offset))
  22 /** Read a dword from a MMIO region */
  23 #define DRM_READ32(map, offset)         readl(((unsigned long)(map)->handle) + (offset))
  24 /** Write a byte into a MMIO region */
  25 #define DRM_WRITE8(map, offset, val)    writeb(val, ((unsigned long)(map)->handle) + (offset))
  26 /** Write a word into a MMIO region */
  27 #define DRM_WRITE16(map, offset, val)   writew(val, ((unsigned long)(map)->handle) + (offset))
  28 /** Write a dword into a MMIO region */
  29 #define DRM_WRITE32(map, offset, val)   writel(val, ((unsigned long)(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->dev
  39
  40 /** IRQ handler arguments and return type and values */
  41 #define DRM_IRQ_ARGS            int irq, void *arg, struct pt_regs *regs
  42 /** backwards compatibility with old irq return values */
  43 #ifndef IRQ_HANDLED
  44 typedef void irqreturn_t;
  45 #define IRQ_HANDLED   /* nothing */
  46 #define IRQ_NONE      /* nothing */
  47 #endif
  48
  49 /** AGP types */
  50 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,70)
  51 #define DRM_AGP_MEM             agp_memory
  52 #define DRM_AGP_KERN            agp_kern_info
  53 #else
  54 #define DRM_AGP_MEM             struct agp_memory
  55 #define DRM_AGP_KERN            struct agp_kern_info
  56 #endif
  57
  58 /** Task queue handler arguments */
  59 #define DRM_TASKQUEUE_ARGS      void *arg
  60
  61 /** For data going into the kernel through the ioctl argument */
  62 #define DRM_COPY_FROM_USER_IOCTL(arg1, arg2, arg3)      \
  63         if ( copy_from_user(&arg1, arg2, arg3) )        \
  64                 return -EFAULT
  65 /** For data going from the kernel through the ioctl argument */
  66 #define DRM_COPY_TO_USER_IOCTL(arg1, arg2, arg3)        \
  67         if ( copy_to_user(arg1, &arg2, arg3) )          \
  68                 return -EFAULT
  69 /** Other copying of data to kernel space */
  70 #define DRM_COPY_FROM_USER(arg1, arg2, arg3)            \
  71         copy_from_user(arg1, arg2, arg3)
  72 /** Other copying of data from kernel space */
  73 #define DRM_COPY_TO_USER(arg1, arg2, arg3)              \
  74         copy_to_user(arg1, arg2, arg3)
  75 /* Macros for copyfrom user, but checking readability only once */
  76 #define DRM_VERIFYAREA_READ( uaddr, size )              \
  77         verify_area( VERIFY_READ, uaddr, size )
  78 #define DRM_COPY_FROM_USER_UNCHECKED(arg1, arg2, arg3)  \
  79         __copy_from_user(arg1, arg2, arg3)
  80 #define DRM_COPY_TO_USER_UNCHECKED(arg1, arg2, arg3)    \
  81         __copy_to_user(arg1, arg2, arg3)
  82 #define DRM_GET_USER_UNCHECKED(val, uaddr)              \
  83         __get_user(val, uaddr)
  84 #define DRM_PUT_USER_UNCHECKED(uaddr, val)              \
  85         __put_user(val, uaddr)
  86
  87
  88 #define DRM_GET_PRIV_WITH_RETURN(_priv, _filp) _priv = _filp->private_data
  89
  90 /**
  91  * Get the pointer to the SAREA.
  92  *
  93  * Searches the SAREA on the mapping lists and points drm_device::sarea to it.
  94  */
  95 #define DRM_GETSAREA()                                                   \
  96 do {                                                                     \
  97         drm_map_list_t *entry;                                           \
  98         list_for_each_entry( entry, &dev->maplist->head, head ) {        \
  99                 if ( entry->map &&                                       \
 100                      entry->map->type == _DRM_SHM &&                     \
 101                      (entry->map->flags & _DRM_CONTAINS_LOCK) ) {        \
 102                         dev_priv->sarea = entry->map;                    \
 103                         break;                                           \
 104                 }                                                        \
 105         }                                                                \
 106 } while (0)
 107
 108 #define DRM_HZ HZ
 109
 110 #define DRM_WAIT_ON( ret, queue, timeout, condition )           \
 111 do {                                                            \
 112         DECLARE_WAITQUEUE(entry, current);                      \
 113         unsigned long end = jiffies + (timeout);                \
 114         add_wait_queue(&(queue), &entry);                       \
 115                                                                 \
 116         for (;;) {                                              \
 117                 current->state = TASK_INTERRUPTIBLE;            \
 118                 if (condition)                                  \
 119                         break;                                  \
 120                 if (time_after_eq(jiffies, end)) {              \
 121                         ret = -EBUSY;                           \
 122                         break;                                  \
 123                 }                                               \
 124                 schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);    \
 125                 if (signal_pending(current)) {                  \
 126                         ret = -EINTR;                           \
 127                         break;                                  \
 128                 }                                               \
 129         }                                                       \
 130         current->state = TASK_RUNNING;                          \
 131         remove_wait_queue(&(queue), &entry);                    \
 132 } while (0)
 133
 134
 135 #define DRM_WAKEUP( queue ) wake_up_interruptible( queue )
 136 #define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )
 137