index : renesas/drm.git	android live master
	libdrm, cloned from git://anongit.freedesktop.org/mesa/drm	Laurent Pinchart

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log msg author committer range

Age	Commit message (Collapse)	Author
2005-02-13	Add the first bits necessary for a port of savage to FreeBSD. More to	Eric Anholt
	follow later.
2005-02-10	add support for texture micro tiling for radeon/r200. Add support for cube	Roland Scheidegger
	maps for r100. (Stephane Marchesin's port of the core version).
2005-02-10	add support for texture micro tiling on radeon/r200. Add support for r100	Roland Scheidegger
	cube maps (since it also requires a version bump) at the same time.
2005-02-10	Stephane's port of Eric's race fix	Keith Whitwell
2005-02-08	fix incorrect PCI id for ATI radeon	Roland Scheidegger
2005-02-08	Close a race which could allow for privilege escalation by users with DRI	Eric Anholt
	privileges on Radeon hardware. Essentially, a malicious program could submit a packet containing an offset (possibly in main memory) to be rendered from/to, while a separate thread switched that offset in userspace rapidly between a valid value and an invalid one. radeon_check_and_fixup_offset() would pull the offset in from user space, check it, and spit it back out to user space to be copied in later by the emit code. It would sometimes catch the bad value, but sometimes the malicious program could modify it after the check and get an invalid offset rendered from/to. Fix this by allocating a temporary buffer and copying the data in at once. While here, make the cliprects stuff not do the VERIFYAREA_READ and COPY_FROM_USER_UNCHECKED gymnastics, avoiding a lock order reversal on FreeBSD. Performance impact is negligible -- no difference on r200 to ~1% improvement on rv200 in quake3 tests (P4 1Ghz, demofour at 1024x768, n=4 or 5).
2005-02-07	Invalid bound check of driver defined ioctls in drm_ioctl	Dave Airlie
	Bug 2489 Reporter: Aapo Tahkola <aet@rasterburn.org>
2005-02-07	Cast user data to correct type in radeon_surface_free's copyin.	Roland Scheidegger
2005-02-07	change DRIVER_ to CORE_ makes things look nicer, also change it so the	Dave Airlie
	driver name is marked on resource allocations
2005-02-07	fix agp detection on linux	Dave Airlie
2005-02-07	Restore a debugging message to DRM_DEBUG instead of DRM_ERROR.	Eric Anholt
2005-02-07	Remove some annoying trailing whitespace.	Eric Anholt
2005-02-05	- Implement drm_initmap, and extend it with the resource number to help	Eric Anholt
	FreeBSD. Add drm_get_resource_{start|len} so linux-specific stuff doesn't need to be in shared code. - Fix mach64 build by using __DECONST to work around passing a const pointer to useracc, which is unfortunately not marked const. - Get rid of a lot of maplist code by not having dev->maplist be a pointer, and by sticking the link entries directly in drm_local_map_t rather than having a separate structure for the linked list. - Factor out map uninit and removal into its own routine, rather than duplicating in both drm_takedown() and drm_rmmap(). - Hook up more driver functions, and correct FreeBSD-specific bits of radeon_cp.c, making radeon work. - Baby steps towards using bus_space as we should.
2005-02-03	Via driver: Add missing drm_poll function to via driver in core.	Thomas Hellstrom
2005-02-03	Declare r128_do_cleanup_pageflip static since it's only used here and its	Eric Anholt
	prototype went away.
2005-02-03	Cast user data to correct type in radeon_surface_free's copyin.	Eric Anholt
2005-02-01	momentary revert. libdrm build may be broken now, but no one uses it yet...	Adam Jackson
2005-02-01	cleanup patch from Adrian Bunk <bunk@stusta.de>	Dave Airlie
2005-02-01	make functions static in i915, remove unused functions	Dave Airlie
2005-02-01	update i830 similiar to the kernel, add statics	Dave Airlie
2005-02-01	make more functions static in i810 and fix pageflip cleanup	Dave Airlie
2005-01-30	Final pass of libdrm.so work:	Adam Jackson
	- Add $(DESTDIR) for distributors doing package creation - Remove OS-specific include path from build - Add /usr/include/drm for driver-kernel API - Install all of shared-core/*.h in /usr/include/drm - Rename xf86drm.h to libdrm.h since we're not X biased anymore - Include backwards compat for xf86drm.h name, with a warning - Fix libdrm source to account for drm.h living in /usr/include/drm
2005-01-29	fix radeon drv	Dave Airlie
2005-01-27	Fixed multiple devices DMA bug. Fixed PCI path FIRE command detection	Thomas Hellstrom
2005-01-27	fix incorrect PCI id for ATI radeon	Dave Airlie
2005-01-26	(Stephane Marchesin,me) Add radeon framebuffer tiling support to radeon	Roland Scheidegger
	drm. Add new ioctls to manage surfaces which cover the tiled areas
2005-01-26	replace magic number with macro constant RADEON_ZBLOCK16	Roland Scheidegger
2005-01-24	use libdrm after it was updated	Dave Airlie
2005-01-24	hopefully fix drm_core setversion ioctl... pointed out by Eric on irc	Dave Airlie
2005-01-22	Add drm.h to the install target.	Adam Jackson
2005-01-20	Removed one bogus Savage3D PCI ID. Corrected another one. Restored	Felix Kuehling
	numerical ordering.
2005-01-20	Add a Savage3D PCI ID	Adam Jackson
2005-01-20	Corrected some confusion of vb_stride and vtx_size	Felix Kuehling
	Implemented SAVAGE_CMD_DMA_IDX and SAVAGE_CMD_VB_IDX for ELTs support in the _savage_render_stage of the 3D driver Bumped minor version and driver date
2005-01-19	Fix cut & paste problem	Alan Hourihane
2005-01-19	Fix a cut & paste problem	Alan Hourihane
2005-01-17	Some code commenting concerning the FIFO & DMA engine.	Jose Fonseca
2005-01-17	Add detection of whether the device is AGP by walking the capabilities	Eric Anholt
	list.
2005-01-17	Add xf86drm.h to the install target.	Adam Jackson
2005-01-16	Shared libdrm work:	Adam Jackson
	- create libdrm.so target - build it by default - drop xf86drmCompat.c from the build - make 'clean' target never fail - use pattern rules for .c -> .o for parallelism - add 'install' target
2005-01-16	remove duplicate drm_sysfs.o	Dave Airlie
2005-01-16	This table is in radeon_drv.h along with the version number so remove it	Dave Airlie
	from here
2005-01-16	The patch makes drmAddBufs/drmMapBufs can handle buffers in video memory	Dave Airlie
	The attached patch adds a new buffer type DRM_FB_BUFFER. It works like AGP memory but uses video memory. From: austinyuan@viatech.com.cn (fd.o bug 1668) Signed-off-by: Dave Airlie <airlied@linux.ie>
2005-01-16	Fixed a bug that prevented the driver from ever emitting triangle strips or	Felix Kuehling
	fans. Bumped patchlevel and driver date.
2005-01-15	Setup MTRRs for frame buffer and aperture manually on Savage3D and	Felix Kuehling
	Savage4-based cards. Automatic setup in drm_initmap doesn't work due to the weird alignment and size of the aperture.
2005-01-13	due to backways compat crap for IRQ_HANDLED etc.. this wouldn't build on	Dave Airlie
	2.4
2005-01-12	Use virt_to_page instead of vmalloc_to_page in drm_do_vm_shm_nopage for	Felix Kuehling
	consistent pages allocated with drm_pci_alloc.
2005-01-11	Import Thomas' changes upto 2.4.3 to shared. Small tweak to install target.	Keith Whitwell
2005-01-11	import Thomas' shared-core via changes up to 2.4.1	Keith Whitwell
2005-01-10	Only try to find the agp_buffer_map if dma_type is AGP. This is all that's	Felix Kuehling
	needed on the DRM side to support PCI Savages. Bumped patch level and driver date.
2005-01-09	Improved workaround for Savage3D DMA lockup to emit NOPs only before the	Felix Kuehling
	first indexed drawing command of a cmdbuf or if a wait command was emitted since the last indexed drawing command.

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generated by cgit v1.2.3 (git 2.25.1) at 2025-08-28 03:16:46 +0000

/**
 * \file drm_vm.c
 * Memory mapping for DRM
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * 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.
 */

#include "drmP.h"

/**
 * \c nopage method for AGP virtual memory.
 *
 * \param vma virtual memory area.
 * \param address access address.
 * \return pointer to the page structure.
 *
 * Find the right map and if it's AGP memory find the real physical page to
 * map, get the page, increment the use count and return it.
 */
#if __OS_HAS_AGP
static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
						unsigned long address)
{
	drm_file_t *priv = vma->vm_file->private_data;
	drm_device_t *dev = priv->head->dev;
	drm_map_t *map = NULL;
	drm_map_list_t *r_list;
	struct list_head *list;

	/*
	 * Find the right map
	 */
	if (!drm_core_has_AGP(dev))
		goto vm_nopage_error;

	if (!dev->agp || !dev->agp->cant_use_aperture)
		goto vm_nopage_error;

	list_for_each(list, &dev->maplist->head) {
		r_list = list_entry(list, drm_map_list_t, head);
		map = r_list->map;
		if (!map)
			continue;
		if (map->offset == VM_OFFSET(vma))
			break;
	}

	if (map && map->type == _DRM_AGP) {
		unsigned long offset = address - vma->vm_start;
		unsigned long baddr = VM_OFFSET(vma) + offset;
		struct drm_agp_mem *agpmem;
		struct page *page;

#ifdef __alpha__
		/*
		 * Adjust to a bus-relative address
		 */
		baddr -= dev->hose->mem_space->start;
#endif

		/*
		 * It's AGP memory - find the real physical page to map
		 */
		for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) {
			if (agpmem->bound <= baddr &&
			    agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
				break;
		}

		if (!agpmem)
			goto vm_nopage_error;

		/*
		 * Get the page, inc the use count, and return it
		 */
		offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
		page = virt_to_page(__va(agpmem->memory->memory[offset]));
		get_page(page);

#if 0
		/* page_count() not defined everywhere */
		DRM_DEBUG
		    ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
		     baddr, __va(agpmem->memory->memory[offset]), offset,
		     page_count(page));
#endif

		return page;
	}
      vm_nopage_error:
	return NOPAGE_SIGBUS;	/* Disallow mremap */
}
#else				/* __OS_HAS_AGP */
static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
						unsigned long address)
{
	return NOPAGE_SIGBUS;
}
#endif				/* __OS_HAS_AGP */

/**
 * \c nopage method for shared virtual memory.
 *
 * \param vma virtual memory area.
 * \param address access address.
 * \return pointer to the page structure.
 *
 * Get the the mapping, find the real physical page to map, get the page, and
 * return it.
 */
static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma,
						    unsigned long address)
{
	drm_map_t *map = (drm_map_t *) vma->vm_private_data;
	unsigned long offset;
	unsigned long i;
	struct page *page;

	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;
	page = vmalloc_to_page((void *)i);
	if (!page)
		return NOPAGE_OOM;
	get_page(page);

	DRM_DEBUG("shm_nopage 0x%lx\n", address);
	return page;
}

/**
 * \c close method for shared virtual memory.
 *
 * \param vma virtual memory area.
 *
 * Deletes map information if we are the last
 * person to close a mapping and it's 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->head->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);
	atomic_dec(&dev->vma_count);

	map = vma->vm_private_data;

	down(&dev->struct_sem);
	for (pt = dev->vmalist, prev = NULL; pt; pt = next) {
		next = pt->next;
		if (pt->vma->vm_private_data == map)
			found_maps++;
		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 = list_entry(list, drm_map_list_t, head);
			if (r_list->map == map)
				found_maps++;
		}

		if (!found_maps) {
			switch (map->type) {
			case _DRM_REGISTERS:
			case _DRM_FRAME_BUFFER:
				if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
					int retcode;
					retcode = mtrr_del(map->mtrr,
							   map->offset,
							   map->size);
					DRM_DEBUG("mtrr_del = %d\n", retcode);
				}
				drm_ioremapfree(map->handle, map->size, dev);
				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);
}

/**
 * \c nopage method for DMA virtual memory.
 *
 * \param vma virtual memory area.
 * \param address access address.
 * \return pointer to the page structure.
 *
 * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 */
static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
						    unsigned long address)
{
	drm_file_t *priv = vma->vm_file->private_data;
	drm_device_t *dev = priv->head->dev;
	drm_device_dma_t *dma = dev->dma;
	unsigned long offset;
	unsigned long page_nr;
	struct page *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_nr = offset >> PAGE_SHIFT;
	page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));

	get_page(page);

	DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr);
	return page;
}

/**
 * \c nopage method for scatter-gather virtual memory.
 *
 * \param vma virtual memory area.
 * \param address access address.
 * \return pointer to the page structure.
 *
 * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 */
static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
						   unsigned long address)
{
	drm_map_t *map = (drm_map_t *) vma->vm_private_data;
	drm_file_t *priv = vma->vm_file->private_data;
	drm_device_t *dev = priv->head->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];
	get_page(page);

	return page;
}

#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)

static struct page *drm_vm_nopage(struct vm_area_struct *vma,
				  unsigned long address, int *type)
{
	if (type)
		*type = VM_FAULT_MINOR;
	return drm_do_vm_nopage(vma, address);
}

static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
				      unsigned long address, int *type)
{
	if (type)
		*type = VM_FAULT_MINOR;
	return drm_do_vm_shm_nopage(vma, address);
}

static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
				      unsigned long address, int *type)
{
	if (type)
		*type = VM_FAULT_MINOR;
	return drm_do_vm_dma_nopage(vma, address);
}

static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
				     unsigned long address, int *type)
{
	if (type)
		*type = VM_FAULT_MINOR;
	return drm_do_vm_sg_nopage(vma, address);
}

#else				/* LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,0) */

static struct page *drm_vm_nopage(struct vm_area_struct *vma,
				  unsigned long address, int unused)
{
	return drm_do_vm_nopage(vma, address);
}

static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
				      unsigned long address, int unused)
{
	return drm_do_vm_shm_nopage(vma, address);
}

static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
				      unsigned long address, int unused)
{
	return drm_do_vm_dma_nopage(vma, address);
}

static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
				     unsigned long address, int unused)
{
	return drm_do_vm_sg_nopage(vma, address);
}

#endif

/** AGP virtual memory operations */
static struct vm_operations_struct drm_vm_ops = {
	.nopage = drm_vm_nopage,
	.open = drm_vm_open,
	.close = drm_vm_close,
};

/** Shared virtual memory operations */
static struct vm_operations_struct drm_vm_shm_ops = {
	.nopage = drm_vm_shm_nopage,
	.open = drm_vm_open,
	.close = drm_vm_shm_close,
};

/** DMA virtual memory operations */
static struct vm_operations_struct drm_vm_dma_ops = {
	.nopage = drm_vm_dma_nopage,
	.open = drm_vm_open,
	.close = drm_vm_close,
};

/** Scatter-gather virtual memory operations */
static struct vm_operations_struct drm_vm_sg_ops = {
	.nopage = drm_vm_sg_nopage,
	.open = drm_vm_open,
	.close = drm_vm_close,
};

/**
 * \c open method for shared virtual memory.
 *
 * \param vma virtual memory area.
 *
 * Create a new drm_vma_entry structure as the \p vma private data entry and
 * add it to drm_device::vmalist.
 */
void drm_vm_open(struct vm_area_struct *vma)
{
	drm_file_t *priv = vma->vm_file->private_data;
	drm_device_t *dev = priv->head->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);

	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);
	}
}

/**
 * \c close method for all virtual memory types.
 *
 * \param vma virtual memory area.
 *
 * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
 * free it.
 */
void drm_vm_close(struct vm_area_struct *vma)
{
	drm_file_t *priv = vma->vm_file->private_data;
	drm_device_t *dev = priv->head->dev;
	drm_vma_entry_t *pt, *prev;

	DRM_DEBUG("0x%08lx,0x%08lx\n",
		  vma->vm_start, vma->vm_end - vma->vm_start);
	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);
}

/**
 * mmap DMA memory.
 *
 * \param filp file pointer.
 * \param vma virtual memory area.
 * \return zero on success or a negative number on failure.
 *
 * Sets the virtual memory area operations structure to vm_dma_ops, the file
 * pointer, and calls vm_open().
 */
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->head->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;

#if LINUX_VERSION_CODE <= 0x02040e	/* KERNEL_VERSION(2,4,14) */
	vma->vm_flags |= VM_LOCKED | VM_SHM;	/* Don't swap */
#else
	vma->vm_flags |= VM_RESERVED;	/* Don't swap */
#endif

	vma->vm_file = filp;	/* Needed for drm_vm_open() */
	drm_vm_open(vma);
	return 0;
}

unsigned long drm_core_get_map_ofs(drm_map_t * map)
{
	return map->offset;
}
EXPORT_SYMBOL(drm_core_get_map_ofs);

unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
{
#ifdef __alpha__
	return dev->hose->dense_mem_base - dev->hose->mem_space->start;
#else
	return 0;
#endif
}
EXPORT_SYMBOL(drm_core_get_reg_ofs);

/**
 * mmap DMA memory.
 *
 * \param filp file pointer.
 * \param vma virtual memory area.
 * \return zero on success or a negative number on failure.
 *
 * If the virtual memory area has no offset associated with it then it's a DMA
 * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
 * checks that the restricted flag is not set, sets the virtual memory operations
 * according to the mapping type and remaps the pages. Finally sets the file
 * pointer and calls vm_open().
 */
int drm_mmap(struct file *filp, struct vm_area_struct *vma)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->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;

	/* We check for "dma". On Apple's UniNorth, it's valid to have
	 * the AGP mapped at physical address 0
	 * --BenH.
	 */
	if (!VM_OFFSET(vma)
#if __OS_HAS_AGP
	    && (!dev->agp
		|| dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
#endif
	    )
		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 = list_entry(list, drm_map_list_t, head);
		map = r_list->map;
		if (!map)
			continue;
		off = dev->driver->get_map_ofs(map);
		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_WRITE | VM_MAYWRITE);
#if defined(__i386__) || defined(__x86_64__)
		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_AGP:
		if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
			/*
			 * On some platforms we can't talk to bus dma address from the CPU, so for
			 * memory of type DRM_AGP, we'll deal with sorting out the real physical
			 * pages and mappings in nopage()
			 */
#if defined(__powerpc__)
			pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
#endif
			vma->vm_ops = &drm_vm_ops;
			break;
		}
		/* fall through to _DRM_FRAME_BUFFER... */
	case _DRM_FRAME_BUFFER:
	case _DRM_REGISTERS:
		if (VM_OFFSET(vma) >= __pa(high_memory)) {
#if defined(__i386__) || defined(__x86_64__)
			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(__powerpc__)
			pgprot_val(vma->vm_page_prot) |=
			    _PAGE_NO_CACHE | _PAGE_GUARDED;
#endif
			vma->vm_flags |= VM_IO;	/* not in core dump */
		}
#if defined(__ia64__)
		if (map->type != _DRM_AGP)
			vma->vm_page_prot =
			    pgprot_writecombine(vma->vm_page_prot);
#endif
		offset = dev->driver->get_reg_ofs(dev);
#ifdef __sparc__
		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(DRM_RPR_ARG(vma) vma->vm_start,
				     VM_OFFSET(vma) + offset,
				     vma->vm_end - vma->vm_start,
				     vma->vm_page_prot))
#endif
			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;
		vma->vm_private_data = (void *)map;
		/* Don't let this area swap.  Change when
		   DRM_KERNEL advisory is supported. */
#if LINUX_VERSION_CODE <= 0x02040e	/* KERNEL_VERSION(2,4,14) */
		vma->vm_flags |= VM_LOCKED;
#else
		vma->vm_flags |= VM_RESERVED;
#endif
		break;
	case _DRM_SCATTER_GATHER:
		vma->vm_ops = &drm_vm_sg_ops;
		vma->vm_private_data = (void *)map;
#if LINUX_VERSION_CODE <= 0x02040e	/* KERNEL_VERSION(2,4,14) */
		vma->vm_flags |= VM_LOCKED;
#else
		vma->vm_flags |= VM_RESERVED;
#endif
		break;
	default:
		return -EINVAL;	/* This should never happen. */
	}
#if LINUX_VERSION_CODE <= 0x02040e	/* KERNEL_VERSION(2,4,14) */
	vma->vm_flags |= VM_LOCKED | VM_SHM;	/* Don't swap */
#else
	vma->vm_flags |= VM_RESERVED;	/* Don't swap */
#endif

	vma->vm_file = filp;	/* Needed for drm_vm_open() */
	drm_vm_open(vma);
	return 0;
}
EXPORT_SYMBOL(drm_mmap);