PFN_DEV was used by callers of dax_direct_access() to figure out if the returned PFN is associated with a page using pfn_t_has_page() or not. However all DAX PFNs now require an assoicated ZONE_DEVICE page so can assume a page exists.
Other users of PFN_DEV were setting it before calling vmf_insert_mixed(). This is unnecessary as it is no longer checked, instead relying on pfn_valid() to determine if there is an associated page or not. Signed-off-by: Alistair Popple <apop...@nvidia.com> Reviewed-by: Christoph Hellwig <h...@lst.de> Reviewed-by: Jason Gunthorpe <j...@nvidia.com> Reviewed-by: Dan Williams <dan.j.willi...@intel.com> --- Changes since v1: - Removed usage of pfn_t_devmap() that was removed later in the series to maintain bisectability as pointed out by Jonathan Cameron. - Rebased on David's cleanup[1] [1] https://lore.kernel.org/linux-mm/20250611120654.545963-1-da...@redhat.com/ --- drivers/gpu/drm/gma500/fbdev.c | 2 +- drivers/gpu/drm/omapdrm/omap_gem.c | 5 ++--- drivers/s390/block/dcssblk.c | 3 +-- drivers/vfio/pci/vfio_pci_core.c | 6 ++---- fs/cramfs/inode.c | 2 +- include/linux/pfn_t.h | 7 ++----- mm/memory.c | 2 +- 7 files changed, 10 insertions(+), 17 deletions(-) diff --git a/drivers/gpu/drm/gma500/fbdev.c b/drivers/gpu/drm/gma500/fbdev.c index 8edefea..109efdc 100644 --- a/drivers/gpu/drm/gma500/fbdev.c +++ b/drivers/gpu/drm/gma500/fbdev.c @@ -33,7 +33,7 @@ static vm_fault_t psb_fbdev_vm_fault(struct vm_fault *vmf) vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); for (i = 0; i < page_num; ++i) { - err = vmf_insert_mixed(vma, address, __pfn_to_pfn_t(pfn, PFN_DEV)); + err = vmf_insert_mixed(vma, address, __pfn_to_pfn_t(pfn, 0)); if (unlikely(err & VM_FAULT_ERROR)) break; address += PAGE_SIZE; diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c b/drivers/gpu/drm/omapdrm/omap_gem.c index b9c67e4..9df05b2 100644 --- a/drivers/gpu/drm/omapdrm/omap_gem.c +++ b/drivers/gpu/drm/omapdrm/omap_gem.c @@ -371,8 +371,7 @@ static vm_fault_t omap_gem_fault_1d(struct drm_gem_object *obj, VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address, pfn, pfn << PAGE_SHIFT); - return vmf_insert_mixed(vma, vmf->address, - __pfn_to_pfn_t(pfn, PFN_DEV)); + return vmf_insert_mixed(vma, vmf->address, __pfn_to_pfn_t(pfn, 0)); } /* Special handling for the case of faulting in 2d tiled buffers */ @@ -468,7 +467,7 @@ static vm_fault_t omap_gem_fault_2d(struct drm_gem_object *obj, for (i = n; i > 0; i--) { ret = vmf_insert_mixed(vma, - vaddr, __pfn_to_pfn_t(pfn, PFN_DEV)); + vaddr, __pfn_to_pfn_t(pfn, 0)); if (ret & VM_FAULT_ERROR) break; pfn += priv->usergart[fmt].stride_pfn; diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c index cdc7b2f..249ae40 100644 --- a/drivers/s390/block/dcssblk.c +++ b/drivers/s390/block/dcssblk.c @@ -923,8 +923,7 @@ __dcssblk_direct_access(struct dcssblk_dev_info *dev_info, pgoff_t pgoff, if (kaddr) *kaddr = __va(dev_info->start + offset); if (pfn) - *pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset), - PFN_DEV); + *pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset), 0); return (dev_sz - offset) / PAGE_SIZE; } diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c index 6328c3a..3f2ad5f 100644 --- a/drivers/vfio/pci/vfio_pci_core.c +++ b/drivers/vfio/pci/vfio_pci_core.c @@ -1669,14 +1669,12 @@ static vm_fault_t vfio_pci_mmap_huge_fault(struct vm_fault *vmf, break; #ifdef CONFIG_ARCH_SUPPORTS_PMD_PFNMAP case PMD_ORDER: - ret = vmf_insert_pfn_pmd(vmf, - __pfn_to_pfn_t(pfn, PFN_DEV), false); + ret = vmf_insert_pfn_pmd(vmf, __pfn_to_pfn_t(pfn, 0), false); break; #endif #ifdef CONFIG_ARCH_SUPPORTS_PUD_PFNMAP case PUD_ORDER: - ret = vmf_insert_pfn_pud(vmf, - __pfn_to_pfn_t(pfn, PFN_DEV), false); + ret = vmf_insert_pfn_pud(vmf, __pfn_to_pfn_t(pfn, 0), false); break; #endif default: diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c index b84d174..820a664 100644 --- a/fs/cramfs/inode.c +++ b/fs/cramfs/inode.c @@ -412,7 +412,7 @@ static int cramfs_physmem_mmap(struct file *file, struct vm_area_struct *vma) for (i = 0; i < pages && !ret; i++) { vm_fault_t vmf; unsigned long off = i * PAGE_SIZE; - pfn_t pfn = phys_to_pfn_t(address + off, PFN_DEV); + pfn_t pfn = phys_to_pfn_t(address + off, 0); vmf = vmf_insert_mixed(vma, vma->vm_start + off, pfn); if (vmf & VM_FAULT_ERROR) ret = vm_fault_to_errno(vmf, 0); diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h index 2d91482..2b0d6e0 100644 --- a/include/linux/pfn_t.h +++ b/include/linux/pfn_t.h @@ -7,7 +7,6 @@ * PFN_FLAGS_MASK - mask of all the possible valid pfn_t flags * PFN_SG_CHAIN - pfn is a pointer to the next scatterlist entry * PFN_SG_LAST - pfn references a page and is the last scatterlist entry - * PFN_DEV - pfn is not covered by system memmap by default * PFN_MAP - pfn has a dynamic page mapping established by a device driver * PFN_SPECIAL - for CONFIG_FS_DAX_LIMITED builds to allow XIP, but not * get_user_pages @@ -15,7 +14,6 @@ #define PFN_FLAGS_MASK (((u64) (~PAGE_MASK)) << (BITS_PER_LONG_LONG - PAGE_SHIFT)) #define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1)) #define PFN_SG_LAST (1ULL << (BITS_PER_LONG_LONG - 2)) -#define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3)) #define PFN_MAP (1ULL << (BITS_PER_LONG_LONG - 4)) #define PFN_SPECIAL (1ULL << (BITS_PER_LONG_LONG - 5)) @@ -23,7 +21,6 @@ { PFN_SPECIAL, "SPECIAL" }, \ { PFN_SG_CHAIN, "SG_CHAIN" }, \ { PFN_SG_LAST, "SG_LAST" }, \ - { PFN_DEV, "DEV" }, \ { PFN_MAP, "MAP" } static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags) @@ -46,7 +43,7 @@ static inline pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags) static inline bool pfn_t_has_page(pfn_t pfn) { - return (pfn.val & PFN_MAP) == PFN_MAP || (pfn.val & PFN_DEV) == 0; + return (pfn.val & PFN_MAP) == PFN_MAP; } static inline unsigned long pfn_t_to_pfn(pfn_t pfn) @@ -100,7 +97,7 @@ static inline pud_t pfn_t_pud(pfn_t pfn, pgprot_t pgprot) #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP static inline bool pfn_t_devmap(pfn_t pfn) { - const u64 flags = PFN_DEV|PFN_MAP; + const u64 flags = PFN_MAP; return (pfn.val & flags) == flags; } diff --git a/mm/memory.c b/mm/memory.c index 2c6eda1..97aaad9 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2544,7 +2544,7 @@ vm_fault_t vmf_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr, pfnmap_setup_cachemode_pfn(pfn, &pgprot); - return insert_pfn(vma, addr, __pfn_to_pfn_t(pfn, PFN_DEV), pgprot, + return insert_pfn(vma, addr, __pfn_to_pfn_t(pfn, 0), pgprot, false); } EXPORT_SYMBOL(vmf_insert_pfn_prot); -- git-series 0.9.1
