Release 4.14 drivers/gpu/drm/drm_vm.c

/**
 * \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 <drm/drmP.h>
#include <linux/export.h>
#include <linux/seq_file.h>
#if defined(__ia64__)
#include <linux/efi.h>
#include <linux/slab.h>
#endif
#include <linux/mem_encrypt.h>
#include <asm/pgtable.h>
#include "drm_internal.h"
#include "drm_legacy.h"


struct drm_vma_entry {
	
struct list_head head;
	
struct vm_area_struct *vma;
	
pid_t pid;
};

static void drm_vm_open(struct vm_area_struct *vma);
static void drm_vm_close(struct vm_area_struct *vma);



static pgprot_t drm_io_prot(struct drm_local_map *map,
			    struct vm_area_struct *vma)
{
	pgprot_t tmp = vm_get_page_prot(vma->vm_flags);

	/* We don't want graphics memory to be mapped encrypted */
	tmp = pgprot_decrypted(tmp);

#if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__)
	if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING))
		tmp = pgprot_noncached(tmp);
	else
		tmp = pgprot_writecombine(tmp);
#elif defined(__ia64__)
	if (efi_range_is_wc(vma->vm_start, vma->vm_end -
				    vma->vm_start))
		tmp = pgprot_writecombine(tmp);
	else
		tmp = pgprot_noncached(tmp);
#elif defined(__sparc__) || defined(__arm__) || defined(__mips__)
	tmp = pgprot_noncached(tmp);
#endif
	return tmp;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Airlie
79
53.38%
1
11.11%
Andrew Lutomirski
26
17.57%
2
22.22%
Benjamin Herrenschmidt
24
16.22%
2
22.22%
Tom Lendacky
8
5.41%
1
11.11%
Jordan Crouse
5
3.38%
1
11.11%
Huacai Chen
5
3.38%
1
11.11%
Adrian Bunk
1
0.68%
1
11.11%
Total
148
100.00%
9
100.00%



static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
{
	pgprot_t tmp = vm_get_page_prot(vma->vm_flags);

#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
	tmp = pgprot_noncached_wc(tmp);
#endif
	return tmp;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Benjamin Herrenschmidt
41
87.23%
2
66.67%
Dave Airlie
6
12.77%
1
33.33%
Total
47
100.00%
3
100.00%

/**
 * \c fault 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 IS_ENABLED(CONFIG_AGP)


static int drm_vm_fault(struct vm_fault *vmf)
{
	struct vm_area_struct *vma = vmf->vma;
	struct drm_file *priv = vma->vm_file->private_data;
	struct drm_device *dev = priv->minor->dev;
	struct drm_local_map *map = NULL;
	struct drm_map_list *r_list;
	struct drm_hash_item *hash;

	/*
         * Find the right map
         */
	if (!dev->agp)
		goto vm_fault_error;

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

	if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
		goto vm_fault_error;

	r_list = drm_hash_entry(hash, struct drm_map_list, hash);
	map = r_list->map;

	if (map && map->type == _DRM_AGP) {
		/*
                 * Using vm_pgoff as a selector forces us to use this unusual
                 * addressing scheme.
                 */
		resource_size_t offset = vmf->address - vma->vm_start;
		resource_size_t baddr = map->offset + 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
                 */
		list_for_each_entry(agpmem, &dev->agp->memory, head) {
			if (agpmem->bound <= baddr &&
			    agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
				break;
		}

		if (&agpmem->head == &dev->agp->memory)
			goto vm_fault_error;

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

		DRM_DEBUG
		    ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
		     (unsigned long long)baddr,
		     agpmem->memory->pages[offset],
		     (unsigned long long)offset,
		     page_count(page));
		return 0;
	}
vm_fault_error:
	return VM_FAULT_SIGBUS;	/* Disallow mremap */
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
153
49.35%
4
14.81%
Dave Airlie
51
16.45%
11
40.74%
Nicholas Piggin
43
13.87%
1
3.70%
Thomas Hellstrom
20
6.45%
1
3.70%
Benjamin Herrenschmidt
14
4.52%
2
7.41%
Dan Carpenter
10
3.23%
1
3.70%
Dave Jiang
9
2.90%
1
3.70%
Linus Torvalds (pre-git)
3
0.97%
1
3.70%
Daniel Vetter
2
0.65%
1
3.70%
Al Viro
2
0.65%
1
3.70%
Ross Zwisler
1
0.32%
1
3.70%
Jan Kara
1
0.32%
1
3.70%
Andrew Morton
1
0.32%
1
3.70%
Total
310
100.00%
27
100.00%

#else


static int drm_vm_fault(struct vm_fault *vmf)
{
	return VM_FAULT_SIGBUS;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicholas Piggin
6
42.86%
1
20.00%
Linus Torvalds
3
21.43%
1
20.00%
Dave Airlie
3
21.43%
1
20.00%
Linus Torvalds (pre-git)
1
7.14%
1
20.00%
Ross Zwisler
1
7.14%
1
20.00%
Total
14
100.00%
5
100.00%

#endif

/**
 * \c nopage method for shared virtual memory.
 *
 * \param vma virtual memory area.
 * \param address access address.
 * \return pointer to the page structure.
 *
 * Get the mapping, find the real physical page to map, get the page, and
 * return it.
 */


static int drm_vm_shm_fault(struct vm_fault *vmf)
{
	struct vm_area_struct *vma = vmf->vma;
	struct drm_local_map *map = vma->vm_private_data;
	unsigned long offset;
	unsigned long i;
	struct page *page;

	if (!map)
		return VM_FAULT_SIGBUS;	/* Nothing allocated */

	offset = vmf->address - vma->vm_start;
	i = (unsigned long)map->handle + offset;
	page = vmalloc_to_page((void *)i);
	if (!page)
		return VM_FAULT_SIGBUS;
	get_page(page);
	vmf->page = page;

	DRM_DEBUG("shm_fault 0x%lx\n", offset);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
51
45.13%
2
18.18%
Nicholas Piggin
31
27.43%
1
9.09%
Ingo Molnar
11
9.73%
2
18.18%
Dave Jiang
9
7.96%
1
9.09%
Linus Torvalds (pre-git)
7
6.19%
1
9.09%
Ross Zwisler
1
0.88%
1
9.09%
Jan Kara
1
0.88%
1
9.09%
Benjamin Herrenschmidt
1
0.88%
1
9.09%
Dave Airlie
1
0.88%
1
9.09%
Total
113
100.00%
11
100.00%

/**
 * \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.
 */


static void drm_vm_shm_close(struct vm_area_struct *vma)
{
	struct drm_file *priv = vma->vm_file->private_data;
	struct drm_device *dev = priv->minor->dev;
	struct drm_vma_entry *pt, *temp;
	struct drm_local_map *map;
	struct drm_map_list *r_list;
	int found_maps = 0;

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

	map = vma->vm_private_data;

	mutex_lock(&dev->struct_mutex);
	list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
		if (pt->vma->vm_private_data == map)
			found_maps++;
		if (pt->vma == vma) {
			list_del(&pt->head);
			kfree(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_for_each_entry(r_list, &dev->maplist, head) {
			if (r_list->map == map)
				found_maps++;
		}

		if (!found_maps) {
			drm_dma_handle_t dmah;

			switch (map->type) {
			case _DRM_REGISTERS:
			case _DRM_FRAME_BUFFER:
				arch_phys_wc_del(map->mtrr);
				iounmap(map->handle);
				break;
			case _DRM_SHM:
				vfree(map->handle);
				break;
			case _DRM_AGP:
			case _DRM_SCATTER_GATHER:
				break;
			case _DRM_CONSISTENT:
				dmah.vaddr = map->handle;
				dmah.busaddr = map->offset;
				dmah.size = map->size;
				__drm_legacy_pci_free(dev, &dmah);
				break;
			}
			kfree(map);
		}
	}
	mutex_unlock(&dev->struct_mutex);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
172
60.99%
2
9.52%
Dave Airlie
85
30.14%
12
57.14%
Linus Torvalds (pre-git)
18
6.38%
1
4.76%
Eric Anholt
2
0.71%
1
4.76%
Christoph Hellwig
1
0.35%
1
4.76%
Nicholas Piggin
1
0.35%
1
4.76%
Andrew Lutomirski
1
0.35%
1
4.76%
Daniel Vetter
1
0.35%
1
4.76%
Benjamin Herrenschmidt
1
0.35%
1
4.76%
Total
282
100.00%
21
100.00%

/**
 * \c fault method for DMA virtual memory.
 *
 * \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 int drm_vm_dma_fault(struct vm_fault *vmf)
{
	struct vm_area_struct *vma = vmf->vma;
	struct drm_file *priv = vma->vm_file->private_data;
	struct drm_device *dev = priv->minor->dev;
	struct drm_device_dma *dma = dev->dma;
	unsigned long offset;
	unsigned long page_nr;
	struct page *page;

	if (!dma)
		return VM_FAULT_SIGBUS;	/* Error */
	if (!dma->pagelist)
		return VM_FAULT_SIGBUS;	/* Nothing allocated */

	offset = vmf->address - vma->vm_start;
					/* vm_[pg]off[set] should be 0 */
	page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
	page = virt_to_page((void *)dma->pagelist[page_nr]);

	get_page(page);
	vmf->page = page;

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
52
36.88%
1
7.69%
Nicholas Piggin
40
28.37%
1
7.69%
Linus Torvalds
28
19.86%
2
15.38%
Dave Jiang
9
6.38%
1
7.69%
Dave Airlie
6
4.26%
5
38.46%
Ben Hutchings
4
2.84%
1
7.69%
Ross Zwisler
1
0.71%
1
7.69%
Jan Kara
1
0.71%
1
7.69%
Total
141
100.00%
13
100.00%

/**
 * \c fault method for scatter-gather virtual memory.
 *
 * \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 int drm_vm_sg_fault(struct vm_fault *vmf)
{
	struct vm_area_struct *vma = vmf->vma;
	struct drm_local_map *map = vma->vm_private_data;
	struct drm_file *priv = vma->vm_file->private_data;
	struct drm_device *dev = priv->minor->dev;
	struct drm_sg_mem *entry = dev->sg;
	unsigned long offset;
	unsigned long map_offset;
	unsigned long page_offset;
	struct page *page;

	if (!entry)
		return VM_FAULT_SIGBUS;	/* Error */
	if (!entry->pagelist)
		return VM_FAULT_SIGBUS;	/* Nothing allocated */

	offset = vmf->address - vma->vm_start;
	map_offset = map->offset - (unsigned long)dev->sg->virtual;
	page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
	page = entry->pagelist[page_offset];
	get_page(page);
	vmf->page = page;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
69
43.12%
1
6.25%
Linus Torvalds
46
28.75%
3
18.75%
Dave Airlie
17
10.62%
7
43.75%
Nicholas Piggin
16
10.00%
1
6.25%
Dave Jiang
9
5.62%
1
6.25%
Ross Zwisler
1
0.62%
1
6.25%
Benjamin Herrenschmidt
1
0.62%
1
6.25%
Jan Kara
1
0.62%
1
6.25%
Total
160
100.00%
16
100.00%

/** AGP virtual memory operations */

static const struct vm_operations_struct drm_vm_ops = {
	.fault = drm_vm_fault,
	.open = drm_vm_open,
	.close = drm_vm_close,
};

/** Shared virtual memory operations */

static const struct vm_operations_struct drm_vm_shm_ops = {
	.fault = drm_vm_shm_fault,
	.open = drm_vm_open,
	.close = drm_vm_shm_close,
};

/** DMA virtual memory operations */

static const struct vm_operations_struct drm_vm_dma_ops = {
	.fault = drm_vm_dma_fault,
	.open = drm_vm_open,
	.close = drm_vm_close,
};

/** Scatter-gather virtual memory operations */

static const struct vm_operations_struct drm_vm_sg_ops = {
	.fault = drm_vm_sg_fault,
	.open = drm_vm_open,
	.close = drm_vm_close,
};



static void drm_vm_open_locked(struct drm_device *dev,
			       struct vm_area_struct *vma)
{
	struct drm_vma_entry *vma_entry;

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

	vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
	if (vma_entry) {
		vma_entry->vma = vma;
		vma_entry->pid = current->pid;
		list_add(&vma_entry->head, &dev->vmalist);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
62
73.81%
1
12.50%
Dave Airlie
11
13.10%
3
37.50%
Rob Clark
5
5.95%
1
12.50%
Thomas Hellstrom
3
3.57%
1
12.50%
Eric Anholt
2
2.38%
1
12.50%
Daniel Vetter
1
1.19%
1
12.50%
Total
84
100.00%
8
100.00%



static void drm_vm_open(struct vm_area_struct *vma)
{
	struct drm_file *priv = vma->vm_file->private_data;
	struct drm_device *dev = priv->minor->dev;

	mutex_lock(&dev->struct_mutex);
	drm_vm_open_locked(dev, vma);
	mutex_unlock(&dev->struct_mutex);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Hellstrom
40
71.43%
1
16.67%
Dave Airlie
7
12.50%
3
50.00%
Linus Torvalds (pre-git)
7
12.50%
1
16.67%
Rob Clark
2
3.57%
1
16.67%
Total
56
100.00%
6
100.00%



static void drm_vm_close_locked(struct drm_device *dev,
				struct vm_area_struct *vma)
{
	struct drm_vma_entry *pt, *temp;

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

	list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
		if (pt->vma == vma) {
			list_del(&pt->head);
			kfree(pt);
			break;
		}
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
50
64.94%
1
12.50%
Dave Airlie
18
23.38%
3
37.50%
Rob Clark
5
6.49%
1
12.50%
Chris Wilson
2
2.60%
1
12.50%
Eric Anholt
1
1.30%
1
12.50%
Daniel Vetter
1
1.30%
1
12.50%
Total
77
100.00%
8
100.00%

/**
 * \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.
 */


static void drm_vm_close(struct vm_area_struct *vma)
{
	struct drm_file *priv = vma->vm_file->private_data;
	struct drm_device *dev = priv->minor->dev;

	mutex_lock(&dev->struct_mutex);
	drm_vm_close_locked(dev, vma);
	mutex_unlock(&dev->struct_mutex);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
45
80.36%
1
25.00%
Linus Torvalds (pre-git)
7
12.50%
1
25.00%
Dave Airlie
2
3.57%
1
25.00%
Rob Clark
2
3.57%
1
25.00%
Total
56
100.00%
4
100.00%

/**
 * mmap DMA memory.
 *
 * \param file_priv DRM file private.
 * \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().
 */


static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *dev;
	struct drm_device_dma *dma;
	unsigned long length = vma->vm_end - vma->vm_start;

	dev = priv->minor->dev;
	dma = dev->dma;
	DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
		  vma->vm_start, vma->vm_end, vma->vm_pgoff);

	/* Length must match exact page count */
	if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
		return -EINVAL;
	}

	if (!capable(CAP_SYS_ADMIN) &&
	    (dma->flags & _DRM_DMA_USE_PCI_RO)) {
		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
	}

	vma->vm_ops = &drm_vm_dma_ops;

	vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;

	drm_vm_open_locked(dev, vma);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
98
48.28%
3
17.65%
George Sapountzis
78
38.42%
1
5.88%
Dave Airlie
16
7.88%
7
41.18%
Linus Torvalds
3
1.48%
1
5.88%
Thomas Hellstrom
2
0.99%
2
11.76%
Konstantin Khlebnikov
2
0.99%
1
5.88%
Nicholas Piggin
2
0.99%
1
5.88%
Rob Clark
2
0.99%
1
5.88%
Total
203
100.00%
17
100.00%



static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
{
#ifdef __alpha__
	return dev->hose->dense_mem_base;
#else
	return 0;
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Airlie
19
67.86%
2
40.00%
Linus Torvalds
7
25.00%
1
20.00%
Benjamin Herrenschmidt
1
3.57%
1
20.00%
Daniel Vetter
1
3.57%
1
20.00%
Total
28
100.00%
5
100.00%

/**
 * mmap DMA memory.
 *
 * \param file_priv DRM file private.
 * \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().
 */


static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *dev = priv->minor->dev;
	struct drm_local_map *map = NULL;
	resource_size_t offset = 0;
	struct drm_hash_item *hash;

	DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
		  vma->vm_start, vma->vm_end, vma->vm_pgoff);

	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 (!vma->vm_pgoff
#if IS_ENABLED(CONFIG_AGP)
	    && (!dev->agp
		|| dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
#endif
	    )
		return drm_mmap_dma(filp, vma);

	if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
		DRM_ERROR("Could not find map\n");
		return -EINVAL;
	}

	map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
	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) {
#if !defined(__arm__)
	case _DRM_AGP:
		if (dev->agp && 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 fault()
                         */
#if defined(__powerpc__)
			vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
#endif
			vma->vm_ops = &drm_vm_ops;
			break;
		}
		/* fall through to _DRM_FRAME_BUFFER... */
#endif
	case _DRM_FRAME_BUFFER:
	case _DRM_REGISTERS:
		offset = drm_core_get_reg_ofs(dev);
		vma->vm_page_prot = drm_io_prot(map, vma);
		if (io_remap_pfn_range(vma, vma->vm_start,
				       (map->offset + offset) >> PAGE_SHIFT,
				       vma->vm_end - vma->vm_start,
				       vma->vm_page_prot))
			return -EAGAIN;
		DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
			  " offset = 0x%llx\n",
			  map->type,
			  vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));

		vma->vm_ops = &drm_vm_ops;
		break;
	case _DRM_CONSISTENT:
		/* Consistent memory is really like shared memory. But
                 * it's allocated in a different way, so avoid fault */
		if (remap_pfn_range(vma, vma->vm_start,
		    page_to_pfn(virt_to_page(map->handle)),
		    vma->vm_end - vma->vm_start, vma->vm_page_prot))
			return -EAGAIN;
		vma->vm_page_prot = drm_dma_prot(map->type, vma);
	/* fall through to _DRM_SHM */
	case _DRM_SHM:
		vma->vm_ops = &drm_vm_shm_ops;
		vma->vm_private_data = (void *)map;
		break;
	case _DRM_SCATTER_GATHER:
		vma->vm_ops = &drm_vm_sg_ops;
		vma->vm_private_data = (void *)map;
		vma->vm_page_prot = drm_dma_prot(map->type, vma);
		break;
	default:
		return -EINVAL;	/* This should never happen. */
	}
	vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;

	drm_vm_open_locked(dev, vma);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
255
43.59%
3
6.38%
Linus Torvalds
142
24.27%
8
17.02%
Dave Airlie
46
7.86%
16
34.04%
Hugh Dickins
40
6.84%
1
2.13%
Benjamin Herrenschmidt
39
6.67%
5
10.64%
Thomas Hellstrom
32
5.47%
3
6.38%
Jordan Crouse
9
1.54%
1
2.13%
Daniel Vetter
8
1.37%
4
8.51%
Randy Dunlap
5
0.85%
1
2.13%
Nicholas Piggin
4
0.68%
2
4.26%
Rob Clark
2
0.34%
1
2.13%
Konstantin Khlebnikov
2
0.34%
1
2.13%
Jesse Barnes
1
0.17%
1
2.13%
Total
585
100.00%
47
100.00%



int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma)
{
	struct drm_file *priv = filp->private_data;
	struct drm_device *dev = priv->minor->dev;
	int ret;

	if (drm_dev_is_unplugged(dev))
		return -ENODEV;

	mutex_lock(&dev->struct_mutex);
	ret = drm_mmap_locked(filp, vma);
	mutex_unlock(&dev->struct_mutex);

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Hellstrom
60
77.92%
1
16.67%
Dave Airlie
15
19.48%
3
50.00%
Daniel Vetter
2
2.60%
2
33.33%
Total
77
100.00%
6
100.00%


EXPORT_SYMBOL(drm_legacy_mmap);



void drm_legacy_vma_flush(struct drm_device *dev)
{
	struct drm_vma_entry *vma, *vma_temp;

	/* Clear vma list (only needed for legacy drivers) */
	list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
		list_del(&vma->head);
		kfree(vma);
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David Herrmann
44
100.00%
1
100.00%
Total
44
100.00%
1
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
631
24.10%
5
5.26%
Linus Torvalds
606
23.15%
11
11.58%
Dave Airlie
498
19.02%
26
27.37%
Thomas Hellstrom
157
6.00%
3
3.16%
Nicholas Piggin
152
5.81%
2
2.11%
Benjamin Herrenschmidt
122
4.66%
6
6.32%
George Sapountzis
78
2.98%
1
1.05%
David Herrmann
70
2.67%
3
3.16%
Chris Wilson
48
1.83%
1
1.05%
Hugh Dickins
40
1.53%
1
1.05%
Dave Jiang
38
1.45%
1
1.05%
Andrew Lutomirski
27
1.03%
2
2.11%
Daniel Vetter
21
0.80%
7
7.37%
Rob Clark
18
0.69%
1
1.05%
Jordan Crouse
14
0.53%
1
1.05%
Ingo Molnar
11
0.42%
2
2.11%
Tony Luck
11
0.42%
1
1.05%
Tom Lendacky
11
0.42%
1
1.05%
Dan Carpenter
10
0.38%
1
1.05%
Eric Anholt
7
0.27%
2
2.11%
Ross Zwisler
5
0.19%
1
1.05%
Huacai Chen
5
0.19%
1
1.05%
Randy Dunlap
5
0.19%
1
1.05%
Konstantin Khlebnikov
4
0.15%
1
1.05%
Alexey Dobriyan
4
0.15%
1
1.05%
Ben Hutchings
4
0.15%
1
1.05%
Jan Kara
4
0.15%
1
1.05%
Tejun Heo
3
0.11%
1
1.05%
Ville Syrjälä
3
0.11%
1
1.05%
Paul Gortmaker
3
0.11%
1
1.05%
Al Viro
2
0.08%
1
1.05%
Andrew Morton
1
0.04%
1
1.05%
Adrian Bunk
1
0.04%
1
1.05%
Jesse Barnes
1
0.04%
1
1.05%
Christoph Hellwig
1
0.04%
1
1.05%
Michael Opdenacker
1
0.04%
1
1.05%
David Howells
1
0.04%
1
1.05%
Total
2618
100.00%
95
100.00%
Directory: drivers/gpu/drm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.