patch-2.4.8 linux/drivers/char/drm/drm_vm.h

• Lines: 501
• Date: Fri Aug 10 18:14:41 2001
• Orig file: v2.4.7/linux/drivers/char/drm/drm_vm.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.7/linux/drivers/char/drm/drm_vm.h linux/drivers/char/drm/drm_vm.h
@@ -0,0 +1,500 @@
+/* drm_vm.h -- Memory mapping for DRM -*- linux-c -*-
+ * Created: Mon Jan  4 08:58:31 1999 by faith@valinux.com
+ *
+ * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
+ * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Rickard E. (Rik) Faith <faith@valinux.com>
+ *    Gareth Hughes <gareth@valinux.com>
+ */
+
+#define __NO_VERSION__
+#include "drmP.h"
+
+struct vm_operations_struct   DRM(vm_ops) = {
+	nopage:	 DRM(vm_nopage),
+	open:	 DRM(vm_open),
+	close:	 DRM(vm_close),
+};
+
+struct vm_operations_struct   DRM(vm_shm_ops) = {
+	nopage:	 DRM(vm_shm_nopage),
+	open:	 DRM(vm_open),
+	close:	 DRM(vm_shm_close),
+};
+
+struct vm_operations_struct   DRM(vm_dma_ops) = {
+	nopage:	 DRM(vm_dma_nopage),
+	open:	 DRM(vm_open),
+	close:	 DRM(vm_close),
+};
+
+struct vm_operations_struct   DRM(vm_sg_ops) = {
+	nopage:  DRM(vm_sg_nopage),
+	open:    DRM(vm_open),
+	close:   DRM(vm_close),
+};
+
+#if LINUX_VERSION_CODE < 0x020317
+unsigned long DRM(vm_nopage)(struct vm_area_struct *vma,
+			     unsigned long address,
+			     int write_access)
+#else
+				/* Return type changed in 2.3.23 */
+struct page *DRM(vm_nopage)(struct vm_area_struct *vma,
+			    unsigned long address,
+			    int write_access)
+#endif
+{
+	return NOPAGE_SIGBUS;		/* Disallow mremap */
+}
+
+#if LINUX_VERSION_CODE < 0x020317
+unsigned long DRM(vm_shm_nopage)(struct vm_area_struct *vma,
+				 unsigned long address,
+				 int write_access)
+#else
+				/* Return type changed in 2.3.23 */
+struct page *DRM(vm_shm_nopage)(struct vm_area_struct *vma,
+				unsigned long address,
+				int write_access)
+#endif
+{
+#if LINUX_VERSION_CODE >= 0x020300
+	drm_map_t	 *map	 = (drm_map_t *)vma->vm_private_data;
+#else
+	drm_map_t	 *map	 = (drm_map_t *)vma->vm_pte;
+#endif
+	unsigned long	 physical;
+	unsigned long	 offset;
+	unsigned long	 i;
+	pgd_t		 *pgd;
+	pmd_t		 *pmd;
+	pte_t		 *pte;
+
+	if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
+	if (!map)    		   return NOPAGE_OOM;  /* Nothing allocated */
+
+	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;
+	physical = (unsigned long)pte_page( *pte )->virtual;
+	atomic_inc(&virt_to_page(physical)->count); /* Dec. by kernel */
+
+	DRM_DEBUG("0x%08lx => 0x%08lx\n", address, physical);
+#if LINUX_VERSION_CODE < 0x020317
+	return physical;
+#else
+	return virt_to_page(physical);
+#endif
+}
+
+/* Special close routine which deletes map information if we are the last
+ * person to close a mapping and its not in the global maplist.
+ */
+
+void DRM(vm_shm_close)(struct vm_area_struct *vma)
+{
+	drm_file_t	*priv	= vma->vm_file->private_data;
+	drm_device_t	*dev	= priv->dev;
+	drm_vma_entry_t *pt, *prev, *next;
+	drm_map_t *map;
+	drm_map_list_t *r_list;
+	struct list_head *list;
+	int found_maps = 0;
+
+	DRM_DEBUG("0x%08lx,0x%08lx\n",
+		  vma->vm_start, vma->vm_end - vma->vm_start);
+#if LINUX_VERSION_CODE < 0x020333
+	MOD_DEC_USE_COUNT; /* Needed before Linux 2.3.51 */
+#endif
+	atomic_dec(&dev->vma_count);
+
+#if LINUX_VERSION_CODE >= 0x020300
+	map = vma->vm_private_data;
+#else
+	map = vma->vm_pte;
+#endif
+
+	down(&dev->struct_sem);
+	for (pt = dev->vmalist, prev = NULL; pt; pt = next) {
+		next = pt->next;
+#if LINUX_VERSION_CODE >= 0x020300
+		if (pt->vma->vm_private_data == map) found_maps++;
+#else
+		if (pt->vma->vm_pte == map) found_maps++;
+#endif
+		if (pt->vma == vma) {
+			if (prev) {
+				prev->next = pt->next;
+			} else {
+				dev->vmalist = pt->next;
+			}
+			DRM(free)(pt, sizeof(*pt), DRM_MEM_VMAS);
+		} else {
+			prev = pt;
+		}
+	}
+	/* We were the only map that was found */
+	if(found_maps == 1 &&
+	   map->flags & _DRM_REMOVABLE) {
+		/* Check to see if we are in the maplist, if we are not, then
+		 * we delete this mappings information.
+		 */
+		found_maps = 0;
+		list = &dev->maplist->head;
+		list_for_each(list, &dev->maplist->head) {
+			r_list = (drm_map_list_t *) list;
+			if (r_list->map == map) found_maps++;
+		}
+
+		if(!found_maps) {
+			switch (map->type) {
+			case _DRM_REGISTERS:
+			case _DRM_FRAME_BUFFER:
+#if __REALLY_HAVE_MTRR
+				if (map->mtrr >= 0) {
+					int retcode;
+					retcode = mtrr_del(map->mtrr,
+							   map->offset,
+							   map->size);
+					DRM_DEBUG("mtrr_del = %d\n", retcode);
+				}
+#endif
+				DRM(ioremapfree)(map->handle, map->size);
+				break;
+			case _DRM_SHM:
+				vfree(map->handle);
+				break;
+			case _DRM_AGP:
+			case _DRM_SCATTER_GATHER:
+				break;
+			}
+			DRM(free)(map, sizeof(*map), DRM_MEM_MAPS);
+		}
+	}
+	up(&dev->struct_sem);
+}
+
+#if LINUX_VERSION_CODE < 0x020317
+unsigned long DRM(vm_dma_nopage)(struct vm_area_struct *vma,
+				 unsigned long address,
+				 int write_access)
+#else
+				/* Return type changed in 2.3.23 */
+struct page *DRM(vm_dma_nopage)(struct vm_area_struct *vma,
+				unsigned long address,
+				int write_access)
+#endif
+{
+	drm_file_t	 *priv	 = vma->vm_file->private_data;
+	drm_device_t	 *dev	 = priv->dev;
+	drm_device_dma_t *dma	 = dev->dma;
+	unsigned long	 physical;
+	unsigned long	 offset;
+	unsigned long	 page;
+
+	if (!dma)		   return NOPAGE_SIGBUS; /* Error */
+	if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
+	if (!dma->pagelist)	   return NOPAGE_OOM ; /* Nothing allocated */
+
+	offset	 = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */
+	page	 = offset >> PAGE_SHIFT;
+	physical = dma->pagelist[page] + (offset & (~PAGE_MASK));
+	atomic_inc(&virt_to_page(physical)->count); /* Dec. by kernel */
+
+	DRM_DEBUG("0x%08lx (page %lu) => 0x%08lx\n", address, page, physical);
+#if LINUX_VERSION_CODE < 0x020317
+	return physical;
+#else
+	return virt_to_page(physical);
+#endif
+}
+
+#if LINUX_VERSION_CODE < 0x020317
+unsigned long DRM(vm_sg_nopage)(struct vm_area_struct *vma,
+				unsigned long address,
+				int write_access)
+#else
+				/* Return type changed in 2.3.23 */
+struct page *DRM(vm_sg_nopage)(struct vm_area_struct *vma,
+			       unsigned long address,
+			       int write_access)
+#endif
+{
+#if LINUX_VERSION_CODE >= 0x020300
+	drm_map_t        *map    = (drm_map_t *)vma->vm_private_data;
+#else
+	drm_map_t        *map    = (drm_map_t *)vma->vm_pte;
+#endif
+	drm_file_t *priv = vma->vm_file->private_data;
+	drm_device_t *dev = priv->dev;
+	drm_sg_mem_t *entry = dev->sg;
+	unsigned long offset;
+	unsigned long map_offset;
+	unsigned long page_offset;
+	struct page *page;
+
+	if (!entry)                return NOPAGE_SIGBUS; /* Error */
+	if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
+	if (!entry->pagelist)      return NOPAGE_OOM ;  /* Nothing allocated */
+
+
+	offset = address - vma->vm_start;
+	map_offset = map->offset - dev->sg->handle;
+	page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
+	page = entry->pagelist[page_offset];
+	atomic_inc(&page->count);                       /* Dec. by kernel */
+
+#if LINUX_VERSION_CODE < 0x020317
+	return (unsigned long)virt_to_phys(page->virtual);
+#else
+	return page;
+#endif
+}
+
+void DRM(vm_open)(struct vm_area_struct *vma)
+{
+	drm_file_t	*priv	= vma->vm_file->private_data;
+	drm_device_t	*dev	= priv->dev;
+	drm_vma_entry_t *vma_entry;
+
+	DRM_DEBUG("0x%08lx,0x%08lx\n",
+		  vma->vm_start, vma->vm_end - vma->vm_start);
+	atomic_inc(&dev->vma_count);
+#if LINUX_VERSION_CODE < 0x020333
+				/* The map can exist after the fd is closed. */
+	MOD_INC_USE_COUNT; /* Needed before Linux 2.3.51 */
+#endif
+
+	vma_entry = DRM(alloc)(sizeof(*vma_entry), DRM_MEM_VMAS);
+	if (vma_entry) {
+		down(&dev->struct_sem);
+		vma_entry->vma	= vma;
+		vma_entry->next = dev->vmalist;
+		vma_entry->pid	= current->pid;
+		dev->vmalist	= vma_entry;
+		up(&dev->struct_sem);
+	}
+}
+
+void DRM(vm_close)(struct vm_area_struct *vma)
+{
+	drm_file_t	*priv	= vma->vm_file->private_data;
+	drm_device_t	*dev	= priv->dev;
+	drm_vma_entry_t *pt, *prev;
+
+	DRM_DEBUG("0x%08lx,0x%08lx\n",
+		  vma->vm_start, vma->vm_end - vma->vm_start);
+#if LINUX_VERSION_CODE < 0x020333
+	MOD_DEC_USE_COUNT; /* Needed before Linux 2.3.51 */
+#endif
+	atomic_dec(&dev->vma_count);
+
+	down(&dev->struct_sem);
+	for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
+		if (pt->vma == vma) {
+			if (prev) {
+				prev->next = pt->next;
+			} else {
+				dev->vmalist = pt->next;
+			}
+			DRM(free)(pt, sizeof(*pt), DRM_MEM_VMAS);
+			break;
+		}
+	}
+	up(&dev->struct_sem);
+}
+
+int DRM(mmap_dma)(struct file *filp, struct vm_area_struct *vma)
+{
+	drm_file_t	 *priv	 = filp->private_data;
+	drm_device_t	 *dev;
+	drm_device_dma_t *dma;
+	unsigned long	 length	 = vma->vm_end - vma->vm_start;
+
+	lock_kernel();
+	dev	 = priv->dev;
+	dma	 = dev->dma;
+	DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
+		  vma->vm_start, vma->vm_end, VM_OFFSET(vma));
+
+				/* Length must match exact page count */
+	if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
+		unlock_kernel();
+		return -EINVAL;
+	}
+	unlock_kernel();
+
+	vma->vm_ops   = &DRM(vm_dma_ops);
+	vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */
+
+#if LINUX_VERSION_CODE < 0x020203 /* KERNEL_VERSION(2,2,3) */
+				/* In Linux 2.2.3 and above, this is
+				   handled in do_mmap() in mm/mmap.c. */
+	++filp->f_count;
+#endif
+	vma->vm_file  =	 filp;	/* Needed for drm_vm_open() */
+	DRM(vm_open)(vma);
+	return 0;
+}
+
+#ifndef DRIVER_GET_MAP_OFS
+#define DRIVER_GET_MAP_OFS()	(map->offset)
+#endif
+
+#ifndef DRIVER_GET_REG_OFS
+#ifdef __alpha__
+#define DRIVER_GET_REG_OFS()	(dev->hose->dense_mem_base -	\
+				 dev->hose->mem_space->start)
+#else
+#define DRIVER_GET_REG_OFS()	0
+#endif
+#endif
+
+int DRM(mmap)(struct file *filp, struct vm_area_struct *vma)
+{
+	drm_file_t	*priv	= filp->private_data;
+	drm_device_t	*dev	= priv->dev;
+	drm_map_t	*map	= NULL;
+	drm_map_list_t  *r_list;
+	unsigned long   offset  = 0;
+	struct list_head *list;
+
+	DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
+		  vma->vm_start, vma->vm_end, VM_OFFSET(vma));
+
+	if ( !priv->authenticated ) return -EACCES;
+
+	if (!VM_OFFSET(vma)) return DRM(mmap_dma)(filp, vma);
+
+				/* A sequential search of a linked list is
+				   fine here because: 1) there will only be
+				   about 5-10 entries in the list and, 2) a
+				   DRI client only has to do this mapping
+				   once, so it doesn't have to be optimized
+				   for performance, even if the list was a
+				   bit longer. */
+	list_for_each(list, &dev->maplist->head) {
+		unsigned long off;
+
+		r_list = (drm_map_list_t *)list;
+		map = r_list->map;
+		if (!map) continue;
+		off = DRIVER_GET_MAP_OFS();
+		if (off == VM_OFFSET(vma)) break;
+	}
+
+	if (!map || ((map->flags&_DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
+		return -EPERM;
+
+				/* Check for valid size. */
+	if (map->size != vma->vm_end - vma->vm_start) return -EINVAL;
+
+	if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
+		vma->vm_flags &= VM_MAYWRITE;
+#if defined(__i386__)
+		pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
+#else
+				/* Ye gads this is ugly.  With more thought
+                                   we could move this up higher and use
+                                   `protection_map' instead.  */
+		vma->vm_page_prot = __pgprot(pte_val(pte_wrprotect(
+			__pte(pgprot_val(vma->vm_page_prot)))));
+#endif
+	}
+
+	switch (map->type) {
+	case _DRM_FRAME_BUFFER:
+	case _DRM_REGISTERS:
+	case _DRM_AGP:
+		if (VM_OFFSET(vma) >= __pa(high_memory)) {
+#if defined(__i386__)
+			if (boot_cpu_data.x86 > 3 && map->type != _DRM_AGP) {
+				pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
+				pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
+			}
+#elif defined(__ia64__)
+			if (map->type != _DRM_AGP)
+				vma->vm_page_prot =
+					pgprot_writecombine(vma->vm_page_prot);
+#elif defined(__powerpc__)
+			pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE | _PAGE_GUARDED;
+#endif
+			vma->vm_flags |= VM_IO;	/* not in core dump */
+		}
+		offset = DRIVER_GET_REG_OFS();
+		if (remap_page_range(vma->vm_start,
+				     VM_OFFSET(vma) + offset,
+				     vma->vm_end - vma->vm_start,
+				     vma->vm_page_prot))
+				return -EAGAIN;
+		DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
+			  " offset = 0x%lx\n",
+			  map->type,
+			  vma->vm_start, vma->vm_end, VM_OFFSET(vma) + offset);
+		vma->vm_ops = &DRM(vm_ops);
+		break;
+	case _DRM_SHM:
+		vma->vm_ops = &DRM(vm_shm_ops);
+#if LINUX_VERSION_CODE >= 0x020300
+		vma->vm_private_data = (void *)map;
+#else
+		vma->vm_pte = (unsigned long)map;
+#endif
+				/* Don't let this area swap.  Change when
+				   DRM_KERNEL advisory is supported. */
+		vma->vm_flags |= VM_LOCKED;
+		break;
+	case _DRM_SCATTER_GATHER:
+		vma->vm_ops = &DRM(vm_sg_ops);
+#if LINUX_VERSION_CODE >= 0x020300
+		vma->vm_private_data = (void *)map;
+#else
+		vma->vm_pte = (unsigned long)map;
+#endif
+                vma->vm_flags |= VM_LOCKED;
+                break;
+	default:
+		return -EINVAL;	/* This should never happen. */
+	}
+	vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */
+
+#if LINUX_VERSION_CODE < 0x020203 /* KERNEL_VERSION(2,2,3) */
+				/* In Linux 2.2.3 and above, this is
+				   handled in do_mmap() in mm/mmap.c. */
+	++filp->f_count;
+#endif
+	vma->vm_file  =	 filp;	/* Needed for drm_vm_open() */
+	DRM(vm_open)(vma);
+	return 0;
+}