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device-dax: make align a per-device property

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Introduce @align to struct dev_dax.

When creating a new device, we still initialize to the default dax_region
@align.  Child devices belonging to a region may wish to keep a different
alignment property instead of a global region-defined one.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Brice Goglin <Brice.Goglin@inria.fr>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: David Hildenbrand <david@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Hulk Robot <hulkci@huawei.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Jason Yan <yanaijie@huawei.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: Jia He <justin.he@arm.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lkml.kernel.org/r/159643105377.4062302.4159447829955683131.stgit@dwillia2-desk3.amr.corp.intel.com
Link: https://lore.kernel.org/r/20200716172913.19658-2-joao.m.martins@oracle.com
Link: https://lkml.kernel.org/r/160106117957.30709.1142303024324655705.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joao Martins 2020-10-13 16:50:50 -07:00 committed by Linus Torvalds
parent 0b07ce872a
commit 33cf94d717
3 changed files with 19 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/dax/bus.c
View File

@ -1218,6 +1218,7 @@ struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data)
dev_dax->dax_dev = dax_dev;
dev_dax->target_node = dax_region->target_node;
dev_dax->align = dax_region->align;
ida_init(&dev_dax->ida);
kref_get(&dax_region->kref);

3
drivers/dax/dax-private.h
View File

@ -62,6 +62,7 @@ struct dax_mapping {
struct dev_dax {
struct dax_region *region;
struct dax_device *dax_dev;
unsigned int align;
int target_node;
int id;
struct ida ida;
@ -84,4 +85,6 @@ static inline struct dax_mapping *to_dax_mapping(struct device *dev)
{
return container_of(dev, struct dax_mapping, dev);
}
phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff, unsigned long size);
#endif

41
drivers/dax/device.c
View File

@ -17,7 +17,6 @@
static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
const char *func)
{
struct dax_region *dax_region = dev_dax->region;
struct device *dev = &dev_dax->dev;
unsigned long mask;
@ -32,7 +31,7 @@ static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
return -EINVAL;
}
mask = dax_region->align - 1;
mask = dev_dax->align - 1;
if (vma->vm_start & mask || vma->vm_end & mask) {
dev_info_ratelimited(dev,
"%s: %s: fail, unaligned vma (%#lx - %#lx, %#lx)\n",
@ -78,21 +77,19 @@ static vm_fault_t __dev_dax_pte_fault(struct dev_dax *dev_dax,
struct vm_fault *vmf, pfn_t *pfn)
{
struct device *dev = &dev_dax->dev;
struct dax_region *dax_region;
phys_addr_t phys;
unsigned int fault_size = PAGE_SIZE;
if (check_vma(dev_dax, vmf->vma, __func__))
return VM_FAULT_SIGBUS;
dax_region = dev_dax->region;
if (dax_region->align > PAGE_SIZE) {
if (dev_dax->align > PAGE_SIZE) {
dev_dbg(dev, "alignment (%#x) > fault size (%#x)\n",
dax_region->align, fault_size);
dev_dax->align, fault_size);
return VM_FAULT_SIGBUS;
}
if (fault_size != dax_region->align)
if (fault_size != dev_dax->align)
return VM_FAULT_SIGBUS;
phys = dax_pgoff_to_phys(dev_dax, vmf->pgoff, PAGE_SIZE);
@ -111,7 +108,6 @@ static vm_fault_t __dev_dax_pmd_fault(struct dev_dax *dev_dax,
{
unsigned long pmd_addr = vmf->address & PMD_MASK;
struct device *dev = &dev_dax->dev;
struct dax_region *dax_region;
phys_addr_t phys;
pgoff_t pgoff;
unsigned int fault_size = PMD_SIZE;
@ -119,16 +115,15 @@ static vm_fault_t __dev_dax_pmd_fault(struct dev_dax *dev_dax,
if (check_vma(dev_dax, vmf->vma, __func__))
return VM_FAULT_SIGBUS;
dax_region = dev_dax->region;
if (dax_region->align > PMD_SIZE) {
if (dev_dax->align > PMD_SIZE) {
dev_dbg(dev, "alignment (%#x) > fault size (%#x)\n",
dax_region->align, fault_size);
dev_dax->align, fault_size);
return VM_FAULT_SIGBUS;
}
if (fault_size < dax_region->align)
if (fault_size < dev_dax->align)
return VM_FAULT_SIGBUS;
else if (fault_size > dax_region->align)
else if (fault_size > dev_dax->align)
return VM_FAULT_FALLBACK;
/* if we are outside of the VMA */
@ -154,7 +149,6 @@ static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax,
{
unsigned long pud_addr = vmf->address & PUD_MASK;
struct device *dev = &dev_dax->dev;
struct dax_region *dax_region;
phys_addr_t phys;
pgoff_t pgoff;
unsigned int fault_size = PUD_SIZE;
@ -163,16 +157,15 @@ static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax,
if (check_vma(dev_dax, vmf->vma, __func__))
return VM_FAULT_SIGBUS;
dax_region = dev_dax->region;
if (dax_region->align > PUD_SIZE) {
if (dev_dax->align > PUD_SIZE) {
dev_dbg(dev, "alignment (%#x) > fault size (%#x)\n",
dax_region->align, fault_size);
dev_dax->align, fault_size);
return VM_FAULT_SIGBUS;
}
if (fault_size < dax_region->align)
if (fault_size < dev_dax->align)
return VM_FAULT_SIGBUS;
else if (fault_size > dax_region->align)
else if (fault_size > dev_dax->align)
return VM_FAULT_FALLBACK;
/* if we are outside of the VMA */
@ -267,9 +260,8 @@ static int dev_dax_split(struct vm_area_struct *vma, unsigned long addr)
{
struct file *filp = vma->vm_file;
struct dev_dax *dev_dax = filp->private_data;
struct dax_region *dax_region = dev_dax->region;
if (!IS_ALIGNED(addr, dax_region->align))
if (!IS_ALIGNED(addr, dev_dax->align))
return -EINVAL;
return 0;
}
@ -278,9 +270,8 @@ static unsigned long dev_dax_pagesize(struct vm_area_struct *vma)
{
struct file *filp = vma->vm_file;
struct dev_dax *dev_dax = filp->private_data;
struct dax_region *dax_region = dev_dax->region;
return dax_region->align;
return dev_dax->align;
}
static const struct vm_operations_struct dax_vm_ops = {
@ -319,13 +310,11 @@ static unsigned long dax_get_unmapped_area(struct file *filp,
{
unsigned long off, off_end, off_align, len_align, addr_align, align;
struct dev_dax *dev_dax = filp ? filp->private_data : NULL;
struct dax_region *dax_region;
if (!dev_dax || addr)
goto out;
dax_region = dev_dax->region;
align = dax_region->align;
align = dev_dax->align;
off = pgoff << PAGE_SHIFT;
off_end = off + len;
off_align = round_up(off, align);