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authorOliver O'Halloran <oohall@gmail.com>2017-04-11 17:59:36 +0200
committerDan Williams <dan.j.williams@intel.com>2017-04-13 06:59:13 +0200
commit762026203c0b87b1088342b664e67ca7c45fb7c4 (patch)
tree155cae151e60850101864c7681f4ef773609ac4f /drivers/dax
parentdevice-dax: fix dax_dev_huge_fault() unknown fault size handling (diff)
downloadlinux-762026203c0b87b1088342b664e67ca7c45fb7c4.tar.xz
linux-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.c17
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) {