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mm, dax, gpu: convert vm_insert_mixed to pfn_t

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Convert the raw unsigned long 'pfn' argument to pfn_t for the purpose of
evaluating the PFN_MAP and PFN_DEV flags.  When both are set it triggers
_PAGE_DEVMAP to be set in the resulting pte.

There are no functional changes to the gpu drivers as a result of this
conversion.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: David Airlie <airlied@linux.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dan Williams 2016-01-15 16:56:40 -08:00 committed by Linus Torvalds
parent 69660fd797
commit 01c8f1c44b
10 changed files with 61 additions and 14 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

5
arch/x86/include/asm/pgtable.h
View file

@ -247,6 +247,11 @@ static inline pte_t pte_mkspecial(pte_t pte)
return pte_set_flags(pte, _PAGE_SPECIAL);
}
static inline pte_t pte_mkdevmap(pte_t pte)
{
return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP);
}
static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
{
pmdval_t v = native_pmd_val(pmd);

4
drivers/gpu/drm/exynos/exynos_drm_gem.c
View file

@ -14,6 +14,7 @@
#include <linux/shmem_fs.h>
#include <linux/dma-buf.h>
#include <linux/pfn_t.h>
#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h"
@ -490,7 +491,8 @@ int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
}
pfn = page_to_pfn(exynos_gem->pages[page_offset]);
ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);
ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address,
__pfn_to_pfn_t(pfn, PFN_DEV));
out:
switch (ret) {

4
drivers/gpu/drm/gma500/framebuffer.c
View file

@ -21,6 +21,7 @@
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/pfn_t.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/slab.h>
@ -132,7 +133,8 @@ static int psbfb_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
for (i = 0; i < page_num; i++) {
pfn = (phys_addr >> PAGE_SHIFT);
ret = vm_insert_mixed(vma, address, pfn);
ret = vm_insert_mixed(vma, address,
__pfn_to_pfn_t(pfn, PFN_DEV));
if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0)))
break;
else if (unlikely(ret != 0)) {

4
drivers/gpu/drm/msm/msm_gem.c
View file

@ -18,6 +18,7 @@
#include <linux/spinlock.h>
#include <linux/shmem_fs.h>
#include <linux/dma-buf.h>
#include <linux/pfn_t.h>
#include "msm_drv.h"
#include "msm_gem.h"
@ -222,7 +223,8 @@ int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
pfn, pfn << PAGE_SHIFT);
ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);
ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address,
__pfn_to_pfn_t(pfn, PFN_DEV));
out_unlock:
mutex_unlock(&dev->struct_mutex);

7
drivers/gpu/drm/omapdrm/omap_gem.c
View file

@ -19,6 +19,7 @@
#include <linux/shmem_fs.h>
#include <linux/spinlock.h>
#include <linux/pfn_t.h>
#include <drm/drm_vma_manager.h>
@ -385,7 +386,8 @@ static int fault_1d(struct drm_gem_object *obj,
VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
pfn, pfn << PAGE_SHIFT);
return vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);
return vm_insert_mixed(vma, (unsigned long)vmf->virtual_address,
__pfn_to_pfn_t(pfn, PFN_DEV));
}
/* Special handling for the case of faulting in 2d tiled buffers */
@ -478,7 +480,8 @@ static int fault_2d(struct drm_gem_object *obj,
pfn, pfn << PAGE_SHIFT);
for (i = n; i > 0; i--) {
vm_insert_mixed(vma, (unsigned long)vaddr, pfn);
vm_insert_mixed(vma, (unsigned long)vaddr,
__pfn_to_pfn_t(pfn, PFN_DEV));
pfn += usergart[fmt].stride_pfn;
vaddr += PAGE_SIZE * m;
}

4
drivers/gpu/drm/ttm/ttm_bo_vm.c
View file

@ -35,6 +35,7 @@
#include <ttm/ttm_placement.h>
#include <drm/drm_vma_manager.h>
#include <linux/mm.h>
#include <linux/pfn_t.h>
#include <linux/rbtree.h>
#include <linux/module.h>
#include <linux/uaccess.h>
@ -229,7 +230,8 @@ static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
}
if (vma->vm_flags & VM_MIXEDMAP)
ret = vm_insert_mixed(&cvma, address, pfn);
ret = vm_insert_mixed(&cvma, address,
__pfn_to_pfn_t(pfn, PFN_DEV));
else
ret = vm_insert_pfn(&cvma, address, pfn);

2
fs/dax.c
View file

@ -363,7 +363,7 @@ static int dax_insert_mapping(struct inode *inode, struct buffer_head *bh,
}
dax_unmap_atomic(bdev, &dax);
error = vm_insert_mixed(vma, vaddr, pfn_t_to_pfn(dax.pfn));
error = vm_insert_mixed(vma, vaddr, dax.pfn);
out:
i_mmap_unlock_read(mapping);

2
include/linux/mm.h
View file

@ -2107,7 +2107,7 @@ int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
unsigned long pfn);
int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
unsigned long pfn);
pfn_t pfn);
int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len);

27
include/linux/pfn_t.h
View file

@ -64,4 +64,31 @@ static inline pfn_t page_to_pfn_t(struct page *page)
{
return pfn_to_pfn_t(page_to_pfn(page));
}
static inline int pfn_t_valid(pfn_t pfn)
{
return pfn_valid(pfn_t_to_pfn(pfn));
}
#ifdef CONFIG_MMU
static inline pte_t pfn_t_pte(pfn_t pfn, pgprot_t pgprot)
{
return pfn_pte(pfn_t_to_pfn(pfn), pgprot);
}
#endif
#ifdef __HAVE_ARCH_PTE_DEVMAP
static inline bool pfn_t_devmap(pfn_t pfn)
{
const unsigned long flags = PFN_DEV|PFN_MAP;
return (pfn.val & flags) == flags;
}
#else
static inline bool pfn_t_devmap(pfn_t pfn)
{
return false;
}
pte_t pte_mkdevmap(pte_t pte);
#endif
#endif /* _LINUX_PFN_T_H_ */

16
mm/memory.c
View file

@ -50,6 +50,7 @@
#include <linux/export.h>
#include <linux/delayacct.h>
#include <linux/init.h>
#include <linux/pfn_t.h>
#include <linux/writeback.h>
#include <linux/memcontrol.h>
#include <linux/mmu_notifier.h>
@ -1500,7 +1501,7 @@ int vm_insert_page(struct vm_area_struct *vma, unsigned long addr,
EXPORT_SYMBOL(vm_insert_page);
static int insert_pfn(struct vm_area_struct *vma, unsigned long addr,
unsigned long pfn, pgprot_t prot)
pfn_t pfn, pgprot_t prot)
{
struct mm_struct *mm = vma->vm_mm;
int retval;
@ -1516,7 +1517,10 @@ static int insert_pfn(struct vm_area_struct *vma, unsigned long addr,
goto out_unlock;
/* Ok, finally just insert the thing.. */
entry = pte_mkspecial(pfn_pte(pfn, prot));
if (pfn_t_devmap(pfn))
entry = pte_mkdevmap(pfn_t_pte(pfn, prot));
else
entry = pte_mkspecial(pfn_t_pte(pfn, prot));
set_pte_at(mm, addr, pte, entry);
update_mmu_cache(vma, addr, pte); /* XXX: why not for insert_page? */
@ -1566,14 +1570,14 @@ int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
if (track_pfn_insert(vma, &pgprot, pfn))
return -EINVAL;
ret = insert_pfn(vma, addr, pfn, pgprot);
ret = insert_pfn(vma, addr, __pfn_to_pfn_t(pfn, PFN_DEV), pgprot);
return ret;
}
EXPORT_SYMBOL(vm_insert_pfn);
int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
unsigned long pfn)
pfn_t pfn)
{
BUG_ON(!(vma->vm_flags & VM_MIXEDMAP));
@ -1587,10 +1591,10 @@ int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
* than insert_pfn). If a zero_pfn were inserted into a VM_MIXEDMAP
* without pte special, it would there be refcounted as a normal page.
*/
if (!HAVE_PTE_SPECIAL && pfn_valid(pfn)) {
if (!HAVE_PTE_SPECIAL && pfn_t_valid(pfn)) {
struct page *page;
page = pfn_to_page(pfn);
page = pfn_t_to_page(pfn);
return insert_page(vma, addr, page, vma->vm_page_prot);
}
return insert_pfn(vma, addr, pfn, vma->vm_page_prot);