![Benjamin Herrenschmidt](/assets/img/avatar_default.png)
This changes drm_local_map to use a resource_size for its "offset" member instead of an unsigned long, thus allowing 32-bit machines with a >32-bit physical address space to be able to store there their register or framebuffer addresses when those are above 4G, such as when using a PCI video card on a recent AMCC 440 SoC. This patch isn't as "trivial" as it sounds: A few functions needed to have some unsigned long/int changed to resource_size_t and a few printk's had to be adjusted. But also, because userspace isn't capable of passing such offsets, I had to modify drm_find_matching_map() to ignore the offset passed in for maps of type _DRM_FRAMEBUFFER or _DRM_REGISTERS. If we ever support multiple _DRM_FRAMEBUFFER or _DRM_REGISTERS maps for a given device, we might have to change that trick, but I don't think that happens on any current driver. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Dave Airlie <airlied@linux.ie>
679 lines
18 KiB
C
679 lines
18 KiB
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 "drmP.h"
|
|
#if defined(__ia64__)
|
|
#include <linux/efi.h>
|
|
#endif
|
|
|
|
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(uint32_t map_type, struct vm_area_struct *vma)
|
|
{
|
|
pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
|
|
|
|
#if defined(__i386__) || defined(__x86_64__)
|
|
if (boot_cpu_data.x86 > 3 && map_type != _DRM_AGP) {
|
|
pgprot_val(tmp) |= _PAGE_PCD;
|
|
pgprot_val(tmp) &= ~_PAGE_PWT;
|
|
}
|
|
#elif defined(__powerpc__)
|
|
pgprot_val(tmp) |= _PAGE_NO_CACHE;
|
|
if (map_type == _DRM_REGISTERS)
|
|
pgprot_val(tmp) |= _PAGE_GUARDED;
|
|
#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__)
|
|
tmp = pgprot_noncached(tmp);
|
|
#endif
|
|
return tmp;
|
|
}
|
|
|
|
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 |= _PAGE_NO_CACHE;
|
|
#endif
|
|
return tmp;
|
|
}
|
|
|
|
/**
|
|
* \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 __OS_HAS_AGP
|
|
static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
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 (!drm_core_has_AGP(dev))
|
|
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 = (unsigned long)vmf->virtual_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)
|
|
goto vm_fault_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);
|
|
vmf->page = page;
|
|
|
|
DRM_DEBUG
|
|
("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
|
|
(unsigned long long)baddr,
|
|
__va(agpmem->memory->memory[offset]),
|
|
(unsigned long long)offset,
|
|
page_count(page));
|
|
return 0;
|
|
}
|
|
vm_fault_error:
|
|
return VM_FAULT_SIGBUS; /* Disallow mremap */
|
|
}
|
|
#else /* __OS_HAS_AGP */
|
|
static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
return VM_FAULT_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 mapping, find the real physical page to map, get the page, and
|
|
* return it.
|
|
*/
|
|
static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
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 = (unsigned long)vmf->virtual_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;
|
|
}
|
|
|
|
/**
|
|
* \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);
|
|
atomic_dec(&dev->vma_count);
|
|
|
|
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);
|
|
drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
|
|
}
|
|
}
|
|
|
|
/* 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:
|
|
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);
|
|
}
|
|
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_pci_free(dev, &dmah);
|
|
break;
|
|
case _DRM_GEM:
|
|
DRM_ERROR("tried to rmmap GEM object\n");
|
|
break;
|
|
}
|
|
drm_free(map, sizeof(*map), DRM_MEM_MAPS);
|
|
}
|
|
}
|
|
mutex_unlock(&dev->struct_mutex);
|
|
}
|
|
|
|
/**
|
|
* \c fault 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 int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
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 = (unsigned long)vmf->virtual_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((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
|
|
|
|
get_page(page);
|
|
vmf->page = page;
|
|
|
|
DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* \c fault 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 int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
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 = (unsigned long)vmf->virtual_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;
|
|
}
|
|
|
|
static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
return drm_do_vm_fault(vma, vmf);
|
|
}
|
|
|
|
static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
return drm_do_vm_shm_fault(vma, vmf);
|
|
}
|
|
|
|
static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
return drm_do_vm_dma_fault(vma, vmf);
|
|
}
|
|
|
|
static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
return drm_do_vm_sg_fault(vma, vmf);
|
|
}
|
|
|
|
/** AGP virtual memory operations */
|
|
static struct vm_operations_struct drm_vm_ops = {
|
|
.fault = drm_vm_fault,
|
|
.open = drm_vm_open,
|
|
.close = drm_vm_close,
|
|
};
|
|
|
|
/** Shared virtual memory operations */
|
|
static 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 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 struct vm_operations_struct drm_vm_sg_ops = {
|
|
.fault = drm_vm_sg_fault,
|
|
.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_locked(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 *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) {
|
|
vma_entry->vma = vma;
|
|
vma_entry->pid = current->pid;
|
|
list_add(&vma_entry->head, &dev->vmalist);
|
|
}
|
|
}
|
|
|
|
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(vma);
|
|
mutex_unlock(&dev->struct_mutex);
|
|
}
|
|
|
|
/**
|
|
* \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;
|
|
struct drm_vma_entry *pt, *temp;
|
|
|
|
DRM_DEBUG("0x%08lx,0x%08lx\n",
|
|
vma->vm_start, vma->vm_end - vma->vm_start);
|
|
atomic_dec(&dev->vma_count);
|
|
|
|
mutex_lock(&dev->struct_mutex);
|
|
list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
|
|
if (pt->vma == vma) {
|
|
list_del(&pt->head);
|
|
drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&dev->struct_mutex);
|
|
}
|
|
|
|
/**
|
|
* 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_RESERVED; /* Don't swap */
|
|
vma->vm_flags |= VM_DONTEXPAND;
|
|
|
|
vma->vm_file = filp; /* Needed for drm_vm_open() */
|
|
drm_vm_open_locked(vma);
|
|
return 0;
|
|
}
|
|
|
|
resource_size_t drm_core_get_map_ofs(struct drm_local_map * map)
|
|
{
|
|
return map->offset;
|
|
}
|
|
|
|
EXPORT_SYMBOL(drm_core_get_map_ofs);
|
|
|
|
resource_size_t 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 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().
|
|
*/
|
|
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 __OS_HAS_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) {
|
|
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 fault()
|
|
*/
|
|
#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:
|
|
offset = dev->driver->get_reg_ofs(dev);
|
|
vma->vm_flags |= VM_IO; /* not in core dump */
|
|
vma->vm_page_prot = drm_io_prot(map->type, 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;
|
|
/* Don't let this area swap. Change when
|
|
DRM_KERNEL advisory is supported. */
|
|
vma->vm_flags |= VM_RESERVED;
|
|
break;
|
|
case _DRM_SCATTER_GATHER:
|
|
vma->vm_ops = &drm_vm_sg_ops;
|
|
vma->vm_private_data = (void *)map;
|
|
vma->vm_flags |= VM_RESERVED;
|
|
vma->vm_page_prot = drm_dma_prot(map->type, vma);
|
|
break;
|
|
default:
|
|
return -EINVAL; /* This should never happen. */
|
|
}
|
|
vma->vm_flags |= VM_RESERVED; /* Don't swap */
|
|
vma->vm_flags |= VM_DONTEXPAND;
|
|
|
|
vma->vm_file = filp; /* Needed for drm_vm_open() */
|
|
drm_vm_open_locked(vma);
|
|
return 0;
|
|
}
|
|
|
|
int drm_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;
|
|
|
|
mutex_lock(&dev->struct_mutex);
|
|
ret = drm_mmap_locked(filp, vma);
|
|
mutex_unlock(&dev->struct_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_mmap);
|