mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 17:59:32 +00:00
![Benjamin Herrenschmidt](/assets/img/avatar_default.png)
Today, most callers of ttm_io_prot() check TTM_PL_FLAG_CACHED before calling it since on some archs it will unconditionally create non-cached mappings. But not all callers do which is incorrect as far as I can tell. Instead, move that check inside ttm_io_port() itself for all archs and make powerpc use the same implementation as ia64 and arm Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Dave Airlie <airlied@redhat.com>
364 lines
9.3 KiB
C
364 lines
9.3 KiB
C
/**************************************************************************
|
|
*
|
|
* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
|
|
* 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
|
|
* THE COPYRIGHT HOLDERS, AUTHORS 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: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "[TTM] " fmt
|
|
|
|
#include <ttm/ttm_module.h>
|
|
#include <ttm/ttm_bo_driver.h>
|
|
#include <ttm/ttm_placement.h>
|
|
#include <drm/drm_vma_manager.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/rbtree.h>
|
|
#include <linux/module.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#define TTM_BO_VM_NUM_PREFAULT 16
|
|
|
|
static int ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo,
|
|
struct vm_area_struct *vma,
|
|
struct vm_fault *vmf)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (likely(!test_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags)))
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* Quick non-stalling check for idle.
|
|
*/
|
|
ret = ttm_bo_wait(bo, false, false, true);
|
|
if (likely(ret == 0))
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* If possible, avoid waiting for GPU with mmap_sem
|
|
* held.
|
|
*/
|
|
if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) {
|
|
ret = VM_FAULT_RETRY;
|
|
if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT)
|
|
goto out_unlock;
|
|
|
|
up_read(&vma->vm_mm->mmap_sem);
|
|
(void) ttm_bo_wait(bo, false, true, false);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/*
|
|
* Ordinary wait.
|
|
*/
|
|
ret = ttm_bo_wait(bo, false, true, false);
|
|
if (unlikely(ret != 0))
|
|
ret = (ret != -ERESTARTSYS) ? VM_FAULT_SIGBUS :
|
|
VM_FAULT_NOPAGE;
|
|
|
|
out_unlock:
|
|
return ret;
|
|
}
|
|
|
|
static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
struct ttm_buffer_object *bo = (struct ttm_buffer_object *)
|
|
vma->vm_private_data;
|
|
struct ttm_bo_device *bdev = bo->bdev;
|
|
unsigned long page_offset;
|
|
unsigned long page_last;
|
|
unsigned long pfn;
|
|
struct ttm_tt *ttm = NULL;
|
|
struct page *page;
|
|
int ret;
|
|
int i;
|
|
unsigned long address = (unsigned long)vmf->virtual_address;
|
|
int retval = VM_FAULT_NOPAGE;
|
|
struct ttm_mem_type_manager *man =
|
|
&bdev->man[bo->mem.mem_type];
|
|
struct vm_area_struct cvma;
|
|
|
|
/*
|
|
* Work around locking order reversal in fault / nopfn
|
|
* between mmap_sem and bo_reserve: Perform a trylock operation
|
|
* for reserve, and if it fails, retry the fault after waiting
|
|
* for the buffer to become unreserved.
|
|
*/
|
|
ret = ttm_bo_reserve(bo, true, true, false, NULL);
|
|
if (unlikely(ret != 0)) {
|
|
if (ret != -EBUSY)
|
|
return VM_FAULT_NOPAGE;
|
|
|
|
if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) {
|
|
if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
|
|
up_read(&vma->vm_mm->mmap_sem);
|
|
(void) ttm_bo_wait_unreserved(bo);
|
|
}
|
|
|
|
return VM_FAULT_RETRY;
|
|
}
|
|
|
|
/*
|
|
* If we'd want to change locking order to
|
|
* mmap_sem -> bo::reserve, we'd use a blocking reserve here
|
|
* instead of retrying the fault...
|
|
*/
|
|
return VM_FAULT_NOPAGE;
|
|
}
|
|
|
|
/*
|
|
* Refuse to fault imported pages. This should be handled
|
|
* (if at all) by redirecting mmap to the exporter.
|
|
*/
|
|
if (bo->ttm && (bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
|
|
retval = VM_FAULT_SIGBUS;
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (bdev->driver->fault_reserve_notify) {
|
|
ret = bdev->driver->fault_reserve_notify(bo);
|
|
switch (ret) {
|
|
case 0:
|
|
break;
|
|
case -EBUSY:
|
|
case -ERESTARTSYS:
|
|
retval = VM_FAULT_NOPAGE;
|
|
goto out_unlock;
|
|
default:
|
|
retval = VM_FAULT_SIGBUS;
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Wait for buffer data in transit, due to a pipelined
|
|
* move.
|
|
*/
|
|
ret = ttm_bo_vm_fault_idle(bo, vma, vmf);
|
|
if (unlikely(ret != 0)) {
|
|
retval = ret;
|
|
goto out_unlock;
|
|
}
|
|
|
|
ret = ttm_mem_io_lock(man, true);
|
|
if (unlikely(ret != 0)) {
|
|
retval = VM_FAULT_NOPAGE;
|
|
goto out_unlock;
|
|
}
|
|
ret = ttm_mem_io_reserve_vm(bo);
|
|
if (unlikely(ret != 0)) {
|
|
retval = VM_FAULT_SIGBUS;
|
|
goto out_io_unlock;
|
|
}
|
|
|
|
page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
|
|
vma->vm_pgoff - drm_vma_node_start(&bo->vma_node);
|
|
page_last = vma_pages(vma) + vma->vm_pgoff -
|
|
drm_vma_node_start(&bo->vma_node);
|
|
|
|
if (unlikely(page_offset >= bo->num_pages)) {
|
|
retval = VM_FAULT_SIGBUS;
|
|
goto out_io_unlock;
|
|
}
|
|
|
|
/*
|
|
* Make a local vma copy to modify the page_prot member
|
|
* and vm_flags if necessary. The vma parameter is protected
|
|
* by mmap_sem in write mode.
|
|
*/
|
|
cvma = *vma;
|
|
cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags);
|
|
|
|
if (bo->mem.bus.is_iomem) {
|
|
cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
|
|
cvma.vm_page_prot);
|
|
} else {
|
|
ttm = bo->ttm;
|
|
cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
|
|
cvma.vm_page_prot);
|
|
|
|
/* Allocate all page at once, most common usage */
|
|
if (ttm->bdev->driver->ttm_tt_populate(ttm)) {
|
|
retval = VM_FAULT_OOM;
|
|
goto out_io_unlock;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Speculatively prefault a number of pages. Only error on
|
|
* first page.
|
|
*/
|
|
for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) {
|
|
if (bo->mem.bus.is_iomem)
|
|
pfn = ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT) + page_offset;
|
|
else {
|
|
page = ttm->pages[page_offset];
|
|
if (unlikely(!page && i == 0)) {
|
|
retval = VM_FAULT_OOM;
|
|
goto out_io_unlock;
|
|
} else if (unlikely(!page)) {
|
|
break;
|
|
}
|
|
page->mapping = vma->vm_file->f_mapping;
|
|
page->index = drm_vma_node_start(&bo->vma_node) +
|
|
page_offset;
|
|
pfn = page_to_pfn(page);
|
|
}
|
|
|
|
if (vma->vm_flags & VM_MIXEDMAP)
|
|
ret = vm_insert_mixed(&cvma, address, pfn);
|
|
else
|
|
ret = vm_insert_pfn(&cvma, address, pfn);
|
|
|
|
/*
|
|
* Somebody beat us to this PTE or prefaulting to
|
|
* an already populated PTE, or prefaulting error.
|
|
*/
|
|
|
|
if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0)))
|
|
break;
|
|
else if (unlikely(ret != 0)) {
|
|
retval =
|
|
(ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
|
|
goto out_io_unlock;
|
|
}
|
|
|
|
address += PAGE_SIZE;
|
|
if (unlikely(++page_offset >= page_last))
|
|
break;
|
|
}
|
|
out_io_unlock:
|
|
ttm_mem_io_unlock(man);
|
|
out_unlock:
|
|
ttm_bo_unreserve(bo);
|
|
return retval;
|
|
}
|
|
|
|
static void ttm_bo_vm_open(struct vm_area_struct *vma)
|
|
{
|
|
struct ttm_buffer_object *bo =
|
|
(struct ttm_buffer_object *)vma->vm_private_data;
|
|
|
|
WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping);
|
|
|
|
(void)ttm_bo_reference(bo);
|
|
}
|
|
|
|
static void ttm_bo_vm_close(struct vm_area_struct *vma)
|
|
{
|
|
struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data;
|
|
|
|
ttm_bo_unref(&bo);
|
|
vma->vm_private_data = NULL;
|
|
}
|
|
|
|
static const struct vm_operations_struct ttm_bo_vm_ops = {
|
|
.fault = ttm_bo_vm_fault,
|
|
.open = ttm_bo_vm_open,
|
|
.close = ttm_bo_vm_close
|
|
};
|
|
|
|
static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev,
|
|
unsigned long offset,
|
|
unsigned long pages)
|
|
{
|
|
struct drm_vma_offset_node *node;
|
|
struct ttm_buffer_object *bo = NULL;
|
|
|
|
drm_vma_offset_lock_lookup(&bdev->vma_manager);
|
|
|
|
node = drm_vma_offset_lookup_locked(&bdev->vma_manager, offset, pages);
|
|
if (likely(node)) {
|
|
bo = container_of(node, struct ttm_buffer_object, vma_node);
|
|
if (!kref_get_unless_zero(&bo->kref))
|
|
bo = NULL;
|
|
}
|
|
|
|
drm_vma_offset_unlock_lookup(&bdev->vma_manager);
|
|
|
|
if (!bo)
|
|
pr_err("Could not find buffer object to map\n");
|
|
|
|
return bo;
|
|
}
|
|
|
|
int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
|
|
struct ttm_bo_device *bdev)
|
|
{
|
|
struct ttm_bo_driver *driver;
|
|
struct ttm_buffer_object *bo;
|
|
int ret;
|
|
|
|
bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma));
|
|
if (unlikely(!bo))
|
|
return -EINVAL;
|
|
|
|
driver = bo->bdev->driver;
|
|
if (unlikely(!driver->verify_access)) {
|
|
ret = -EPERM;
|
|
goto out_unref;
|
|
}
|
|
ret = driver->verify_access(bo, filp);
|
|
if (unlikely(ret != 0))
|
|
goto out_unref;
|
|
|
|
vma->vm_ops = &ttm_bo_vm_ops;
|
|
|
|
/*
|
|
* Note: We're transferring the bo reference to
|
|
* vma->vm_private_data here.
|
|
*/
|
|
|
|
vma->vm_private_data = bo;
|
|
|
|
/*
|
|
* We'd like to use VM_PFNMAP on shared mappings, where
|
|
* (vma->vm_flags & VM_SHARED) != 0, for performance reasons,
|
|
* but for some reason VM_PFNMAP + x86 PAT + write-combine is very
|
|
* bad for performance. Until that has been sorted out, use
|
|
* VM_MIXEDMAP on all mappings. See freedesktop.org bug #75719
|
|
*/
|
|
vma->vm_flags |= VM_MIXEDMAP;
|
|
vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
|
|
return 0;
|
|
out_unref:
|
|
ttm_bo_unref(&bo);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(ttm_bo_mmap);
|
|
|
|
int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
|
|
{
|
|
if (vma->vm_pgoff != 0)
|
|
return -EACCES;
|
|
|
|
vma->vm_ops = &ttm_bo_vm_ops;
|
|
vma->vm_private_data = ttm_bo_reference(bo);
|
|
vma->vm_flags |= VM_MIXEDMAP;
|
|
vma->vm_flags |= VM_IO | VM_DONTEXPAND;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ttm_fbdev_mmap);
|