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/* 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 unused)
#else
/* Return type changed in 2.3.23 */
struct page *DRM(vm_nopage)(struct vm_area_struct *vma,
unsigned long address,
int unused)
#endif
{
#if __REALLY_HAVE_AGP
drm_file_t *priv = vma->vm_file->private_data;
drm_device_t *dev = priv->dev;
drm_map_t *map = NULL;
drm_map_list_t *r_list;
struct list_head *list;
/*
* Find the right map
*/
if(!dev->agp->cant_use_aperture) goto vm_nopage_error;
list_for_each(list, &dev->maplist->head) {
r_list = (drm_map_list_t *)list;
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;
#if __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;
agpmem->memory->memory[offset] &= dev->agp->page_mask;
page = virt_to_page(__va(agpmem->memory->memory[offset]));
get_page(page);
DRM_DEBUG("baddr = 0x%lx page = 0x%p, offset = 0x%lx\n",
baddr, __va(agpmem->memory->memory[offset]), offset);
#if LINUX_VERSION_CODE < 0x020317
return page_address(page);
#else
return page;
#endif
}
vm_nopage_error:
#endif /* __REALLY_HAVE_AGP */
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 unused)
#else
/* Return type changed in 2.3.23 */
struct page *DRM(vm_shm_nopage)(struct vm_area_struct *vma,
unsigned long address,
int unused)
#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 offset;
unsigned long i;
pgd_t *pgd;
pmd_t *pmd;
pte_t *pte;
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;
/* 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;
page = pte_page(*pte);
get_page(page);
DRM_DEBUG("shm_nopage 0x%lx\n", address);
#if LINUX_VERSION_CODE < 0x020317
return page_address(page);
#else
return page;
#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 unused)
#else
/* Return type changed in 2.3.23 */
struct page *DRM(vm_dma_nopage)(struct vm_area_struct *vma,
unsigned long address,
int unused)
#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 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);
#if LINUX_VERSION_CODE < 0x020317
return page_address(page);
#else
return page;
#endif
}
#if LINUX_VERSION_CODE < 0x020317
unsigned long DRM(vm_sg_nopage)(struct vm_area_struct *vma,
unsigned long address,
int unused)
#else
/* Return type changed in 2.3.23 */
struct page *DRM(vm_sg_nopage)(struct vm_area_struct *vma,
unsigned long address,
int unused)
#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];
get_page(page);
#if LINUX_VERSION_CODE < 0x020317
return page_address(page);
#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_RESERVED; /* 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_AGP:
#if defined(__alpha__)
/*
* On Alpha 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()
*/
vma->vm_ops = &DRM(vm_ops);
break;
#endif
/* fall through to _DRM_FRAME_BUFFER... */
case _DRM_FRAME_BUFFER:
case _DRM_REGISTERS:
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();
#ifdef __sparc__
if (io_remap_page_range(vma->vm_start,
VM_OFFSET(vma) + offset,
vma->vm_end - vma->vm_start,
vma->vm_page_prot, 0))
#else
if (remap_page_range(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);
#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_RESERVED;
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_RESERVED;
break;
default:
return -EINVAL; /* This should never happen. */
}
vma->vm_flags |= VM_RESERVED; /* 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;
}
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