Allow drm to build under 2.4 and 2.5(.14)

8 files changed, 99 insertions, 69 deletions

diff --git a/linux-core/drmP.h b/linux-core/drmP.h
index 85a6a06f6..ee6c3781c 100644
--- a/linux-core/drmP.h
+++ b/linux-core/drmP.h
@@ -144,6 +144,57 @@
 
 #define DRM_MAX_CTXBITMAP (PAGE_SIZE * 8)
 
+				/* Backward compatibility section */
+#ifndef minor
+#define minor(x) MINOR((x))
+#endif
+
+#ifndef MODULE_LICENSE
+#define MODULE_LICENSE(x) 
+#endif
+
+#ifndef preempt_disable
+#define preempt_disable()
+#define preempt_enable()
+#endif
+
+#ifndef pte_offset_map 
+#define pte_offset_map pte_offset
+#define pte_unmap(pte)
+#endif
+
+#if LINUX_VERSION_CODE < 0x020500
+static inline struct page * vmalloc_to_page(void * vmalloc_addr)
+{
+	unsigned long addr = (unsigned long) vmalloc_addr;
+	struct page *page = NULL;
+	pgd_t *pgd = pgd_offset_k(addr);
+	pmd_t *pmd;
+	pte_t *ptep, pte;
+  
+	if (!pgd_none(*pgd)) {
+		pmd = pmd_offset(pgd, addr);
+		if (!pmd_none(*pmd)) {
+			preempt_disable();
+			ptep = pte_offset_map(pmd, addr);
+			pte = *ptep;
+			if (pte_present(pte))
+				page = pte_page(pte);
+			pte_unmap(ptep);
+			preempt_enable();
+		}
+	}
+	return page;
+}
+#endif
+
+#if LINUX_VERSION_CODE < 0x020500
+#define DRM_RPR_ARG(vma)
+#else
+#define DRM_RPR_ARG(vma) vma,
+#endif
+
+
 #define VM_OFFSET(vma) ((vma)->vm_pgoff << PAGE_SHIFT)
 
 				/* Macros to make printk easier */
diff --git a/linux-core/drm_drv.c b/linux-core/drm_drv.c
index 49862f3f4..b124c4225 100644
--- a/linux-core/drm_drv.c
+++ b/linux-core/drm_drv.c
@@ -218,9 +218,7 @@ static char *drm_opts = NULL;
 MODULE_AUTHOR( DRIVER_AUTHOR );
 MODULE_DESCRIPTION( DRIVER_DESC );
 MODULE_PARM( drm_opts, "s" );
-#ifdef MODULE_LICENSE
 MODULE_LICENSE("GPL and additional rights");
-#endif
 
 static int DRM(setup)( drm_device_t *dev )
 {
@@ -705,7 +703,7 @@ int DRM(open)( struct inode *inode, struct file *filp )
 	int i;
 
 	for (i = 0; i < DRM(numdevs); i++) {
-		if (MINOR(inode->i_rdev) == DRM(minor)[i]) {
+		if (minor(inode->i_rdev) == DRM(minor)[i]) {
 			dev = &(DRM(device)[i]);
 			break;
 		}
diff --git a/linux-core/drm_fops.c b/linux-core/drm_fops.c
index 9c2135fed..3d4bffa52 100644
--- a/linux-core/drm_fops.c
+++ b/linux-core/drm_fops.c
@@ -38,7 +38,7 @@
 
 int DRM(open_helper)(struct inode *inode, struct file *filp, drm_device_t *dev)
 {
-	kdev_t	     minor = MINOR(inode->i_rdev);
+	int	     minor = minor(inode->i_rdev);
 	drm_file_t   *priv;
 
 	if (filp->f_flags & O_EXCL)   return -EBUSY; /* No exclusive opens */
@@ -125,31 +125,21 @@ ssize_t DRM(read)(struct file *filp, char *buf, size_t count, loff_t *off)
 	int	      avail;
 	int	      send;
 	int	      cur;
-	DECLARE_WAITQUEUE(wait, current);
 
 	DRM_DEBUG("%p, %p\n", dev->buf_rp, dev->buf_wp);
 
-	add_wait_queue(&dev->buf_readers, &wait);
-	set_current_state(TASK_INTERRUPTIBLE);
 	while (dev->buf_rp == dev->buf_wp) {
 		DRM_DEBUG("  sleeping\n");
 		if (filp->f_flags & O_NONBLOCK) {
-			remove_wait_queue(&dev->buf_readers, &wait);
-			set_current_state(TASK_RUNNING);
 			return -EAGAIN;
 		}
-		schedule(); /* wait for dev->buf_readers */
+		interruptible_sleep_on(&dev->buf_readers);
 		if (signal_pending(current)) {
 			DRM_DEBUG("  interrupted\n");
-			remove_wait_queue(&dev->buf_readers, &wait);
-			set_current_state(TASK_RUNNING);
 			return -ERESTARTSYS;
 		}
 		DRM_DEBUG("  awake\n");
-		set_current_state(TASK_INTERRUPTIBLE);
 	}
-	remove_wait_queue(&dev->buf_readers, &wait);
-	set_current_state(TASK_RUNNING);
 
 	left  = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
 	avail = DRM_BSZ - left;
diff --git a/linux-core/drm_scatter.c b/linux-core/drm_scatter.c
index 07e8e4e54..1aedb4037 100644
--- a/linux-core/drm_scatter.c
+++ b/linux-core/drm_scatter.c
@@ -66,9 +66,6 @@ int DRM(sg_alloc)( struct inode *inode, struct file *filp,
 	drm_scatter_gather_t request;
 	drm_sg_mem_t *entry;
 	unsigned long pages, i, j;
-	pgd_t *pgd;
-	pmd_t *pmd;
-	pte_t *pte;
 
 	DRM_DEBUG( "%s\n", __FUNCTION__ );
 
@@ -137,21 +134,10 @@ int DRM(sg_alloc)( struct inode *inode, struct file *filp,
 	DRM_DEBUG( "sg alloc virtual = %p\n", entry->virtual );
 
 	for ( i = entry->handle, j = 0 ; j < pages ; i += PAGE_SIZE, j++ ) {
-		pgd = pgd_offset_k( i );
-		if ( !pgd_present( *pgd ) )
+		entry->pagelist[j] = vmalloc_to_page((void *)i);
+		if (!entry->pagelist[j])
 			goto failed;
-
-		pmd = pmd_offset( pgd, i );
-		if ( !pmd_present( *pmd ) )
-			goto failed;
-
-		pte = pte_offset( pmd, i );
-		if ( !pte_present( *pte ) )
-			goto failed;
-
-		entry->pagelist[j] = pte_page( *pte );
-
-		SetPageReserved( entry->pagelist[j] );
+		SetPageReserved(entry->pagelist[j]);
 	}
 
 	request.handle = entry->handle;
diff --git a/linux-core/drm_stub.c b/linux-core/drm_stub.c
index ead5b9595..b1e789235 100644
--- a/linux-core/drm_stub.c
+++ b/linux-core/drm_stub.c
@@ -49,7 +49,7 @@ static struct drm_stub_info {
 
 static int DRM(stub_open)(struct inode *inode, struct file *filp)
 {
-	int                    minor = MINOR(inode->i_rdev);
+	int                    minor = minor(inode->i_rdev);
 	int                    err   = -ENODEV;
 	struct file_operations *old_fops;
 
diff --git a/linux-core/drm_vm.c b/linux-core/drm_vm.c
index 6803a57b0..c07c9affc 100644
--- a/linux-core/drm_vm.c
+++ b/linux-core/drm_vm.c
@@ -130,9 +130,6 @@ struct page *DRM(vm_shm_nopage)(struct vm_area_struct *vma,
 	drm_map_t	 *map	 = (drm_map_t *)vma->vm_private_data;
 	unsigned long	 offset;
 	unsigned long	 i;
-	pgd_t		 *pgd;
-	pmd_t		 *pmd;
-	pte_t		 *pte;
 	struct page	 *page;
 
 	if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
@@ -140,17 +137,9 @@ struct page *DRM(vm_shm_nopage)(struct vm_area_struct *vma,
 
 	offset	 = address - vma->vm_start;
 	i = (unsigned long)map->handle + offset;
-	/* We have to walk page tables here because we need large SAREA's, and
-	 * they need to be virtually contiguous in kernel space.
-	 */
-	pgd = pgd_offset_k( i );
-	if( !pgd_present( *pgd ) ) return NOPAGE_OOM;
-	pmd = pmd_offset( pgd, i );
-	if( !pmd_present( *pmd ) ) return NOPAGE_OOM;
-	pte = pte_offset( pmd, i );
-	if( !pte_present( *pte ) ) return NOPAGE_OOM;
-
-	page = pte_page(*pte);
+	page = vmalloc_to_page((void *)i);
+	if (!page)
+		return NOPAGE_OOM;
 	get_page(page);
 
 	DRM_DEBUG("shm_nopage 0x%lx\n", address);
@@ -462,12 +451,12 @@ int DRM(mmap)(struct file *filp, struct vm_area_struct *vma)
 		}
 		offset = DRIVER_GET_REG_OFS();
 #ifdef __sparc__
-		if (io_remap_page_range(vma->vm_start,
+		if (io_remap_page_range(DRM_RPR_ARG(vma) vma->vm_start,
 					VM_OFFSET(vma) + offset,
 					vma->vm_end - vma->vm_start,
 					vma->vm_page_prot, 0))
 #else
-		if (remap_page_range(vma->vm_start,
+		if (remap_page_range(DRM_RPR_ARG(vma) vma->vm_start,
 				     VM_OFFSET(vma) + offset,
 				     vma->vm_end - vma->vm_start,
 				     vma->vm_page_prot))
diff --git a/linux-core/i810_dma.c b/linux-core/i810_dma.c
index 815633b6a..6722acd2b 100644
--- a/linux-core/i810_dma.c
+++ b/linux-core/i810_dma.c
@@ -159,7 +159,7 @@ int i810_mmap_buffers(struct file *filp, struct vm_area_struct *vma)
    	buf_priv->currently_mapped = I810_BUF_MAPPED;
 	unlock_kernel();
 
-	if (remap_page_range(vma->vm_start,
+	if (remap_page_range(DRM_RPR_ARG(vma) vma->vm_start,
 			     VM_OFFSET(vma),
 			     vma->vm_end - vma->vm_start,
 			     vma->vm_page_prot)) return -EAGAIN;
@@ -270,22 +270,30 @@ static unsigned long i810_alloc_page(drm_device_t *dev)
 	if(address == 0UL)
 		return 0;
 
+#if LINUX_VERSION_CODE < 0x020500
 	atomic_inc(&virt_to_page(address)->count);
 	set_bit(PG_locked, &virt_to_page(address)->flags);
-
+#else
+	get_page(virt_to_page(address));
+	SetPageLocked(virt_to_page(address));
+#endif
 	return address;
 }
 
 static void i810_free_page(drm_device_t *dev, unsigned long page)
 {
-	if(page == 0UL)
-		return;
-
-	atomic_dec(&virt_to_page(page)->count);
-	clear_bit(PG_locked, &virt_to_page(page)->flags);
-	wake_up(&virt_to_page(page)->wait);
-	free_page(page);
-	return;
+	if (page) {
+#if LINUX_VERSION_CODE < 0x020500
+		atomic_dec(&virt_to_page(page)->count);
+		clear_bit(PG_locked, &virt_to_page(page)->flags);
+		wake_up(&virt_to_page(page)->wait);
+#else
+		struct page *p = virt_to_page(page);
+		put_page(p);
+		unlock_page(p);
+#endif
+		free_page(page);
+	}
 }
 
 static int i810_dma_cleanup(drm_device_t *dev)
diff --git a/linux-core/i830_dma.c b/linux-core/i830_dma.c
index fbdc95230..a2b39ee0e 100644
--- a/linux-core/i830_dma.c
+++ b/linux-core/i830_dma.c
@@ -183,7 +183,7 @@ int i830_mmap_buffers(struct file *filp, struct vm_area_struct *vma)
    	buf_priv->currently_mapped = I830_BUF_MAPPED;
 	unlock_kernel();
 
-	if (remap_page_range(vma->vm_start,
+	if (remap_page_range(DRM_RPR_ARG(vma) vma->vm_start,
 			     VM_OFFSET(vma),
 			     vma->vm_end - vma->vm_start,
 			     vma->vm_page_prot)) return -EAGAIN;
@@ -306,22 +306,30 @@ static unsigned long i830_alloc_page(drm_device_t *dev)
 	if(address == 0UL) 
 		return 0;
 	
+#if LINUX_VERSION_CODE < 0x020500
 	atomic_inc(&virt_to_page(address)->count);
 	set_bit(PG_locked, &virt_to_page(address)->flags);
-   
+#else
+	get_page(virt_to_page(address));
+	SetPageLocked(virt_to_page(address));
+#endif
 	return address;
 }
 
 static void i830_free_page(drm_device_t *dev, unsigned long page)
 {
-	if(page == 0UL) 
-		return;
-	
-	atomic_dec(&virt_to_page(page)->count);
-	clear_bit(PG_locked, &virt_to_page(page)->flags);
-	wake_up(&virt_to_page(page)->wait);
-	free_page(page);
-	return;
+	if (page) {
+#if LINUX_VERSION_CODE < 0x020500
+		atomic_dec(&virt_to_page(page)->count);
+		clear_bit(PG_locked, &virt_to_page(page)->flags);
+		wake_up(&virt_to_page(page)->wait);
+#else
+		struct page *p = virt_to_page(page);
+		put_page(p);
+		unlock_page(p);
+#endif
+		free_page(page);
+	}
 }
 
 static int i830_dma_cleanup(drm_device_t *dev)