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sys/dev/drm/core/drm_vm.c
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/** | |||||
* \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 <linux/export.h> | |||||
#include <linux/pci.h> | |||||
#include <linux/seq_file.h> | |||||
#include <linux/vmalloc.h> | |||||
#if defined(__ia64__) | |||||
#include <linux/efi.h> | |||||
#include <linux/slab.h> | |||||
#endif | |||||
#include <linux/mem_encrypt.h> | |||||
#include <asm/pgtable.h> | |||||
#include <drm/drm_agpsupport.h> | |||||
#include <drm/drm_device.h> | |||||
#include <drm/drm_drv.h> | |||||
#include <drm/drm_file.h> | |||||
#include <drm/drm_framebuffer.h> | |||||
#include <drm/drm_gem.h> | |||||
#include <drm/drm_print.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; | |||||
}; | |||||
#ifdef __linux__ | |||||
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__) || \ | |||||
defined(__mips__) | |||||
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__) | |||||
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 = pgprot_noncached_wc(tmp); | |||||
#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 IS_ENABLED(CONFIG_AGP) | |||||
static vm_fault_t 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 */ | |||||
} | |||||
#else | |||||
static vm_fault_t drm_vm_fault(struct vm_fault *vmf) | |||||
{ | |||||
return VM_FAULT_SIGBUS; | |||||
} | |||||
#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 vm_fault_t 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; | |||||
} | |||||
/** | |||||
* \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); | |||||
} | |||||
/** | |||||
* \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 vm_fault_t 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; | |||||
} | |||||
/** | |||||
* \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 vm_fault_t 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; | |||||
} | |||||
/** 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); | |||||
} | |||||
} | |||||
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); | |||||
} | |||||
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; | |||||
} | |||||
} | |||||
} | |||||
/** | |||||
* \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); | |||||
} | |||||
/** | |||||
* 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; | |||||
} | |||||
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 | |||||
} | |||||
/** | |||||
* 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; | |||||
} | |||||
#endif | |||||
/* fall through - to _DRM_FRAME_BUFFER... */ | |||||
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; | |||||
} | |||||
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; | |||||
} | |||||
EXPORT_SYMBOL(drm_legacy_mmap); | |||||
#if IS_ENABLED(CONFIG_DRM_LEGACY) | |||||
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); | |||||
} | |||||
} | |||||
#endif | |||||
#endif |