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linux-stable-rt/drivers/char/drm/drm_vm.c

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/**
* \file drm_vm.h
* 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);
/**
* \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 (r_list->user_token == VM_OFFSET(vma))
break;
}
if (map && map->type == _DRM_AGP) {
unsigned long offset = address - vma->vm_start;
unsigned long 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
*/
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);
DRM_DEBUG("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
baddr, __va(agpmem->memory->memory[offset]), offset,
page_count(page));
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.
*/
static 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) {
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);
}
drm_ioremapfree(map->handle, map->size, dev);
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;
}
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 - (unsigned long)dev->sg->virtual;
page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
page = entry->pagelist[page_offset];
get_page(page);
return page;
}
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);
}
/** 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.
*/
static 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.
*/
static 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().
*/
static 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;
vma->vm_flags |= VM_RESERVED; /* Don't swap */
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) {
r_list = list_entry(list, drm_map_list_t, head);
map = r_list->map;
if (!map) continue;
if (r_list->user_token == 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 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;
if (map->type == _DRM_REGISTERS)
pgprot_val(vma->vm_page_prot) |= _PAGE_GUARDED;
#endif
vma->vm_flags |= VM_IO; /* not in core dump */
#if defined(__ia64__)
if (efi_range_is_wc(vma->vm_start, vma->vm_end -
vma->vm_start))
vma->vm_page_prot =
pgprot_writecombine(vma->vm_page_prot);
else
vma->vm_page_prot =
pgprot_noncached(vma->vm_page_prot);
#endif
offset = dev->driver->get_reg_ofs(dev);
#ifdef __sparc__
if (io_remap_pfn_range(DRM_RPR_ARG(vma) vma->vm_start,
(map->offset + offset) >> PAGE_SHIFT,
vma->vm_end - vma->vm_start,
vma->vm_page_prot))
#else
if (io_remap_pfn_range(vma, vma->vm_start,
(map->offset + offset) >> PAGE_SHIFT,
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, map->offset + offset);
vma->vm_ops = &drm_vm_ops;
break;
case _DRM_SHM:
case _DRM_CONSISTENT:
/* Consistent memory is really like shared memory. It's only
* allocate in a different way */
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;
break;
default:
return -EINVAL; /* This should never happen. */
}
vma->vm_flags |= VM_RESERVED; /* Don't swap */
vma->vm_file = filp; /* Needed for drm_vm_open() */
drm_vm_open(vma);
return 0;
}
EXPORT_SYMBOL(drm_mmap);
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