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| author | Oliver O'Halloran <oohall@gmail.com> | 2017-04-12 01:59:36 +1000 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2017-04-12 21:59:13 -0700 |
| commit | 762026203c0b87b1088342b664e67ca7c45fb7c4 (patch) | |
| tree | 155cae151e60850101864c7681f4ef773609ac4f /drivers/dax | |
| parent | 54eafcc9e339affb8982fd21e1fc4aa4a036655b (diff) | |
| download | linux-stable-762026203c0b87b1088342b664e67ca7c45fb7c4.tar.gz linux-stable-762026203c0b87b1088342b664e67ca7c45fb7c4.tar.bz2 linux-stable-762026203c0b87b1088342b664e67ca7c45fb7c4.zip | |
device-dax: improve fault handler debug output
A couple of minor improvements to the debug output in the fault handlers:
a) Print the region alignment and fault size when we sent a SIGBUS
because the region alignment is greater than the fault size.
b) Fix the message in the PFN_{DEV|MAP} check.
c) Additionally print the fault size enum value in the huge fault handler.
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax')
| -rw-r--r-- | drivers/dax/dax.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c index 94036d92ed16..352cc54056ce 100644 --- a/drivers/dax/dax.c +++ b/drivers/dax/dax.c @@ -435,7 +435,8 @@ static int __dax_dev_pte_fault(struct dax_dev *dax_dev, struct vm_fault *vmf) dax_region = dax_dev->region; if (dax_region->align > PAGE_SIZE) { - dev_dbg(dev, "%s: alignment > fault size\n", __func__); + dev_dbg(dev, "%s: alignment (%#x) > fault size (%#x)\n", + __func__, dax_region->align, fault_size); return VM_FAULT_SIGBUS; } @@ -476,13 +477,14 @@ static int __dax_dev_pmd_fault(struct dax_dev *dax_dev, struct vm_fault *vmf) dax_region = dax_dev->region; if (dax_region->align > PMD_SIZE) { - dev_dbg(dev, "%s: alignment > fault size\n", __func__); + dev_dbg(dev, "%s: alignment (%#x) > fault size (%#x)\n", + __func__, dax_region->align, fault_size); return VM_FAULT_SIGBUS; } /* dax pmd 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__); + dev_dbg(dev, "%s: region lacks devmap flags\n", __func__); return VM_FAULT_SIGBUS; } @@ -527,13 +529,14 @@ static int __dax_dev_pud_fault(struct dax_dev *dax_dev, struct vm_fault *vmf) dax_region = dax_dev->region; if (dax_region->align > PUD_SIZE) { - dev_dbg(dev, "%s: alignment > fault size\n", __func__); + dev_dbg(dev, "%s: alignment (%#x) > fault size (%#x)\n", + __func__, dax_region->align, fault_size); 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__); + dev_dbg(dev, "%s: region lacks devmap flags\n", __func__); return VM_FAULT_SIGBUS; } @@ -574,10 +577,10 @@ static int dax_dev_huge_fault(struct vm_fault *vmf, struct file *filp = vmf->vma->vm_file; struct dax_dev *dax_dev = filp->private_data; - dev_dbg(&dax_dev->dev, "%s: %s: %s (%#lx - %#lx)\n", __func__, + dev_dbg(&dax_dev->dev, "%s: %s: %s (%#lx - %#lx) size = %d\n", __func__, current->comm, (vmf->flags & FAULT_FLAG_WRITE) ? "write" : "read", - vmf->vma->vm_start, vmf->vma->vm_end); + vmf->vma->vm_start, vmf->vma->vm_end, pe_size); id = srcu_read_lock(&dax_srcu); switch (pe_size) { |