diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-25 10:29:09 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-25 10:29:09 -0800 |
commit | 7b46588f364f4f40c25f43ceabb6f705d20793e2 (patch) | |
tree | 29e80019ee791abe58176161f3ae2b766749b808 /drivers/dax | |
parent | 915f3e3f76c05b2da93c4cc278eebc2d9219d9f4 (diff) | |
parent | 95330473636e5e4546f94874c957c3be66bb2140 (diff) |
Merge branch 'akpm' (patches from Andrew)
Merge more updates from Andrew Morton:
- almost all of the rest of MM
- misc bits
- KASAN updates
- procfs
- lib/ updates
- checkpatch updates
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (124 commits)
checkpatch: remove false unbalanced braces warning
checkpatch: notice unbalanced else braces in a patch
checkpatch: add another old address for the FSF
checkpatch: update $logFunctions
checkpatch: warn on logging continuations
checkpatch: warn on embedded function names
lib/lz4: remove back-compat wrappers
fs/pstore: fs/squashfs: change usage of LZ4 to work with new LZ4 version
crypto: change LZ4 modules to work with new LZ4 module version
lib/decompress_unlz4: change module to work with new LZ4 module version
lib: update LZ4 compressor module
lib/test_sort.c: make it explicitly non-modular
lib: add CONFIG_TEST_SORT to enable self-test of sort()
rbtree: use designated initializers
linux/kernel.h: fix DIV_ROUND_CLOSEST to support negative divisors
lib/find_bit.c: micro-optimise find_next_*_bit
lib: add module support to atomic64 tests
lib: add module support to glob tests
lib: add module support to crc32 tests
kernel/ksysfs.c: add __ro_after_init to bin_attribute structure
...
Diffstat (limited to 'drivers/dax')
-rw-r--r-- | drivers/dax/dax.c | 92 |
1 files changed, 69 insertions, 23 deletions
diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c index 18e9875f6277..b75c77254fdb 100644 --- a/drivers/dax/dax.c +++ b/drivers/dax/dax.c @@ -419,8 +419,7 @@ static phys_addr_t pgoff_to_phys(struct dax_dev *dax_dev, pgoff_t pgoff, return -1; } -static int __dax_dev_fault(struct dax_dev *dax_dev, struct vm_area_struct *vma, - struct vm_fault *vmf) +static int __dax_dev_pte_fault(struct dax_dev *dax_dev, struct vm_fault *vmf) { struct device *dev = &dax_dev->dev; struct dax_region *dax_region; @@ -428,7 +427,7 @@ static int __dax_dev_fault(struct dax_dev *dax_dev, struct vm_area_struct *vma, phys_addr_t phys; pfn_t pfn; - if (check_vma(dax_dev, vma, __func__)) + if (check_vma(dax_dev, vmf->vma, __func__)) return VM_FAULT_SIGBUS; dax_region = dax_dev->region; @@ -446,7 +445,7 @@ static int __dax_dev_fault(struct dax_dev *dax_dev, struct vm_area_struct *vma, pfn = phys_to_pfn_t(phys, dax_region->pfn_flags); - rc = vm_insert_mixed(vma, vmf->address, pfn); + rc = vm_insert_mixed(vmf->vma, vmf->address, pfn); if (rc == -ENOMEM) return VM_FAULT_OOM; @@ -456,22 +455,6 @@ static int __dax_dev_fault(struct dax_dev *dax_dev, struct vm_area_struct *vma, return VM_FAULT_NOPAGE; } -static int dax_dev_fault(struct vm_area_struct *vma, struct vm_fault *vmf) -{ - int rc; - struct file *filp = vma->vm_file; - struct dax_dev *dax_dev = filp->private_data; - - dev_dbg(&dax_dev->dev, "%s: %s: %s (%#lx - %#lx)\n", __func__, - current->comm, (vmf->flags & FAULT_FLAG_WRITE) - ? "write" : "read", vma->vm_start, vma->vm_end); - rcu_read_lock(); - rc = __dax_dev_fault(dax_dev, vma, vmf); - rcu_read_unlock(); - - return rc; -} - static int __dax_dev_pmd_fault(struct dax_dev *dax_dev, struct vm_fault *vmf) { unsigned long pmd_addr = vmf->address & PMD_MASK; @@ -510,7 +493,53 @@ static int __dax_dev_pmd_fault(struct dax_dev *dax_dev, struct vm_fault *vmf) vmf->flags & FAULT_FLAG_WRITE); } -static int dax_dev_pmd_fault(struct vm_fault *vmf) +#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD +static int __dax_dev_pud_fault(struct dax_dev *dax_dev, struct vm_fault *vmf) +{ + unsigned long pud_addr = vmf->address & PUD_MASK; + struct device *dev = &dax_dev->dev; + struct dax_region *dax_region; + phys_addr_t phys; + pgoff_t pgoff; + pfn_t pfn; + + if (check_vma(dax_dev, vmf->vma, __func__)) + return VM_FAULT_SIGBUS; + + dax_region = dax_dev->region; + if (dax_region->align > PUD_SIZE) { + dev_dbg(dev, "%s: alignment > fault size\n", __func__); + return VM_FAULT_SIGBUS; + } + + /* dax pud mappings require pfn_t_devmap() */ + if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) != (PFN_DEV|PFN_MAP)) { + dev_dbg(dev, "%s: alignment > fault size\n", __func__); + return VM_FAULT_SIGBUS; + } + + pgoff = linear_page_index(vmf->vma, pud_addr); + phys = pgoff_to_phys(dax_dev, pgoff, PUD_SIZE); + if (phys == -1) { + dev_dbg(dev, "%s: phys_to_pgoff(%#lx) failed\n", __func__, + pgoff); + return VM_FAULT_SIGBUS; + } + + pfn = phys_to_pfn_t(phys, dax_region->pfn_flags); + + return vmf_insert_pfn_pud(vmf->vma, vmf->address, vmf->pud, pfn, + vmf->flags & FAULT_FLAG_WRITE); +} +#else +static int __dax_dev_pud_fault(struct dax_dev *dax_dev, struct vm_fault *vmf) +{ + return VM_FAULT_FALLBACK; +} +#endif /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ + +static int dax_dev_huge_fault(struct vm_fault *vmf, + enum page_entry_size pe_size) { int rc; struct file *filp = vmf->vma->vm_file; @@ -522,15 +551,32 @@ static int dax_dev_pmd_fault(struct vm_fault *vmf) vmf->vma->vm_start, vmf->vma->vm_end); rcu_read_lock(); - rc = __dax_dev_pmd_fault(dax_dev, vmf); + switch (pe_size) { + case PE_SIZE_PTE: + rc = __dax_dev_pte_fault(dax_dev, vmf); + break; + case PE_SIZE_PMD: + rc = __dax_dev_pmd_fault(dax_dev, vmf); + break; + case PE_SIZE_PUD: + rc = __dax_dev_pud_fault(dax_dev, vmf); + break; + default: + return VM_FAULT_FALLBACK; + } rcu_read_unlock(); return rc; } +static int dax_dev_fault(struct vm_fault *vmf) +{ + return dax_dev_huge_fault(vmf, PE_SIZE_PTE); +} + static const struct vm_operations_struct dax_dev_vm_ops = { .fault = dax_dev_fault, - .pmd_fault = dax_dev_pmd_fault, + .huge_fault = dax_dev_huge_fault, }; static int dax_mmap(struct file *filp, struct vm_area_struct *vma) |