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device-dax: add dis-contiguous resource support

Browse Source 
Break the requirement that device-dax instances are physically contiguous.
With this constraint removed it allows fragmented available capacity to
be fully allocated.

This capability is useful to mitigate the "noisy neighbor" problem with
memory-side-cache management for virtual machines, or any other scenario
where a platform address boundary also designates a performance boundary.
For example a direct mapped memory side cache might rotate cache colors at
1GB boundaries.  With dis-contiguous allocations a device-dax instance
could be configured to contain only 1 cache color.

It also satisfies Joao's use case (see link) for partitioning memory for
exclusive guest access.  It allows for a future potential mode where the
host kernel need not allocate 'struct page' capacity up-front.

Reported-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://lore.kernel.org/lkml/20200110190313.17144-1-joao.m.martins@oracle.com/
Link: https://lkml.kernel.org/r/159643104304.4062302.16561669534797528660.stgit@dwillia2-desk3.amr.corp.intel.com
Link: https://lkml.kernel.org/r/160106116875.30709.11456649969327399771.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dan Williams 2020-10-13 16:50:39 -07:00 committed by Linus Torvalds
parent b7b3c01b19
commit 60e93dc097
5 changed files with 320 additions and 121 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

215
drivers/dax/bus.c
View File

@ -136,15 +136,27 @@ static bool is_static(struct dax_region *dax_region)
return (dax_region->res.flags & IORESOURCE_DAX_STATIC) != 0;
}
static u64 dev_dax_size(struct dev_dax *dev_dax)
{
u64 size = 0;
int i;
device_lock_assert(&dev_dax->dev);
for (i = 0; i < dev_dax->nr_range; i++)
size += range_len(&dev_dax->ranges[i].range);
return size;
}
static int dax_bus_probe(struct device *dev)
{
struct dax_device_driver *dax_drv = to_dax_drv(dev->driver);
struct dev_dax *dev_dax = to_dev_dax(dev);
struct dax_region *dax_region = dev_dax->region;
struct range *range = &dev_dax->range;
int rc;
if (range_len(range) == 0 || dev_dax->id < 0)
if (dev_dax_size(dev_dax) == 0 || dev_dax->id < 0)
return -ENXIO;
rc = dax_drv->probe(dev_dax);
@ -354,15 +366,19 @@ void kill_dev_dax(struct dev_dax *dev_dax)
}
EXPORT_SYMBOL_GPL(kill_dev_dax);
static void free_dev_dax_range(struct dev_dax *dev_dax)
static void free_dev_dax_ranges(struct dev_dax *dev_dax)
{
struct dax_region *dax_region = dev_dax->region;
struct range *range = &dev_dax->range;
int i;
device_lock_assert(dax_region->dev);
if (range_len(range))
for (i = 0; i < dev_dax->nr_range; i++) {
struct range *range = &dev_dax->ranges[i].range;
__release_region(&dax_region->res, range->start,
range_len(range));
}
dev_dax->nr_range = 0;
}
static void unregister_dev_dax(void *dev)
@ -372,7 +388,7 @@ static void unregister_dev_dax(void *dev)
dev_dbg(dev, "%s\n", __func__);
kill_dev_dax(dev_dax);
free_dev_dax_range(dev_dax);
free_dev_dax_ranges(dev_dax);
device_del(dev);
put_device(dev);
}
@ -423,7 +439,7 @@ static ssize_t delete_store(struct device *dev, struct device_attribute *attr,
device_lock(dev);
device_lock(victim);
dev_dax = to_dev_dax(victim);
if (victim->driver || range_len(&dev_dax->range))
if (victim->driver || dev_dax_size(dev_dax))
rc = -EBUSY;
else {
/*
@ -569,51 +585,86 @@ static int alloc_dev_dax_range(struct dev_dax *dev_dax, u64 start,
struct dax_region *dax_region = dev_dax->region;
struct resource *res = &dax_region->res;
struct device *dev = &dev_dax->dev;
struct dev_dax_range *ranges;
unsigned long pgoff = 0;
struct resource *alloc;
int i;
device_lock_assert(dax_region->dev);
/* handle the seed alloc special case */
if (!size) {
dev_dax->range = (struct range) {
.start = res->start,
.end = res->start - 1,
};
if (dev_WARN_ONCE(dev, dev_dax->nr_range,
"0-size allocation must be first\n"))
return -EBUSY;
/* nr_range == 0 is elsewhere special cased as 0-size device */
return 0;
}
alloc = __request_region(res, start, size, dev_name(dev), 0);
if (!alloc)
ranges = krealloc(dev_dax->ranges, sizeof(*ranges)
* (dev_dax->nr_range + 1), GFP_KERNEL);
if (!ranges)
return -ENOMEM;
dev_dax->range = (struct range) {
alloc = __request_region(res, start, size, dev_name(dev), 0);
if (!alloc) {
/*
* If this was an empty set of ranges nothing else
* will release @ranges, so do it now.
*/
if (!dev_dax->nr_range) {
kfree(ranges);
ranges = NULL;
}
dev_dax->ranges = ranges;
return -ENOMEM;
}
for (i = 0; i < dev_dax->nr_range; i++)
pgoff += PHYS_PFN(range_len(&ranges[i].range));
dev_dax->ranges = ranges;
ranges[dev_dax->nr_range++] = (struct dev_dax_range) {
.pgoff = pgoff,
.range = {
.start = alloc->start,
.end = alloc->end,
},
};
dev_dbg(dev, "alloc range[%d]: %pa:%pa\n", dev_dax->nr_range - 1,
&alloc->start, &alloc->end);
return 0;
}
static int adjust_dev_dax_range(struct dev_dax *dev_dax, struct resource *res, resource_size_t size)
{
int last_range = dev_dax->nr_range - 1;
struct dev_dax_range *dax_range = &dev_dax->ranges[last_range];
struct dax_region *dax_region = dev_dax->region;
struct range *range = &dev_dax->range;
int rc = 0;
bool is_shrink = resource_size(res) > size;
struct range *range = &dax_range->range;
struct device *dev = &dev_dax->dev;
int rc;
device_lock_assert(dax_region->dev);
if (size)
if (dev_WARN_ONCE(dev, !size, "deletion is handled by dev_dax_shrink\n"))
return -EINVAL;
rc = adjust_resource(res, range->start, size);
else
__release_region(&dax_region->res, range->start, range_len(range));
if (rc)
return rc;
dev_dax->range = (struct range) {
*range = (struct range) {
.start = range->start,
.end = range->start + size - 1,
};
dev_dbg(dev, "%s range[%d]: %#llx:%#llx\n", is_shrink ? "shrink" : "extend",
last_range, (unsigned long long) range->start,
(unsigned long long) range->end);
return 0;
}
@ -621,7 +672,11 @@ static ssize_t size_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dev_dax *dev_dax = to_dev_dax(dev);
unsigned long long size = range_len(&dev_dax->range);
unsigned long long size;
device_lock(dev);
size = dev_dax_size(dev_dax);
device_unlock(dev);
return sprintf(buf, "%llu\n", size);
}
@ -639,10 +694,29 @@ static bool alloc_is_aligned(struct dax_region *dax_region,
static int dev_dax_shrink(struct dev_dax *dev_dax, resource_size_t size)
{
resource_size_t to_shrink = dev_dax_size(dev_dax) - size;
struct dax_region *dax_region = dev_dax->region;
struct range *range = &dev_dax->range;
struct resource *res, *adjust = NULL;
struct device *dev = &dev_dax->dev;
int i;
for (i = dev_dax->nr_range - 1; i >= 0; i--) {
struct range *range = &dev_dax->ranges[i].range;
struct resource *adjust = NULL, *res;
resource_size_t shrink;
shrink = min_t(u64, to_shrink, range_len(range));
if (shrink >= range_len(range)) {
__release_region(&dax_region->res, range->start,
range_len(range));
dev_dax->nr_range--;
dev_dbg(dev, "delete range[%d]: %#llx:%#llx\n", i,
(unsigned long long) range->start,
(unsigned long long) range->end);
to_shrink -= shrink;
if (!to_shrink)
break;
continue;
}
for_each_dax_region_resource(dax_region, res)
if (strcmp(res->name, dev_name(dev)) == 0
@ -651,20 +725,51 @@ static int dev_dax_shrink(struct dev_dax *dev_dax, resource_size_t size)
break;
}
if (dev_WARN_ONCE(dev, !adjust, "failed to find matching resource\n"))
if (dev_WARN_ONCE(dev, !adjust || i != dev_dax->nr_range - 1,
"failed to find matching resource\n"))
return -ENXIO;
return adjust_dev_dax_range(dev_dax, adjust, size);
return adjust_dev_dax_range(dev_dax, adjust, range_len(range)
- shrink);
}
return 0;
}
/*
* Only allow adjustments that preserve the relative pgoff of existing
* allocations. I.e. the dev_dax->ranges array is ordered by increasing pgoff.
*/
static bool adjust_ok(struct dev_dax *dev_dax, struct resource *res)
{
struct dev_dax_range *last;
int i;
if (dev_dax->nr_range == 0)
return false;
if (strcmp(res->name, dev_name(&dev_dax->dev)) != 0)
return false;
last = &dev_dax->ranges[dev_dax->nr_range - 1];
if (last->range.start != res->start || last->range.end != res->end)
return false;
for (i = 0; i < dev_dax->nr_range - 1; i++) {
struct dev_dax_range *dax_range = &dev_dax->ranges[i];
if (dax_range->pgoff > last->pgoff)
return false;
}
return true;
}
static ssize_t dev_dax_resize(struct dax_region *dax_region,
struct dev_dax *dev_dax, resource_size_t size)
{
resource_size_t avail = dax_region_avail_size(dax_region), to_alloc;
resource_size_t dev_size = range_len(&dev_dax->range);
resource_size_t dev_size = dev_dax_size(dev_dax);
struct resource *region_res = &dax_region->res;
struct device *dev = &dev_dax->dev;
const char *name = dev_name(dev);
struct resource *res, *first;
resource_size_t alloc = 0;
int rc;
if (dev->driver)
return -EBUSY;
@ -685,35 +790,47 @@ static ssize_t dev_dax_resize(struct dax_region *dax_region,
* may involve adjusting the end of an existing resource, or
* allocating a new resource.
*/
retry:
first = region_res->child;
if (!first)
return alloc_dev_dax_range(dev_dax, dax_region->res.start, to_alloc);
for (res = first; to_alloc && res; res = res->sibling) {
rc = -ENOSPC;
for (res = first; res; res = res->sibling) {
struct resource *next = res->sibling;
resource_size_t free;
/* space at the beginning of the region */
free = 0;
if (res == first && res->start > dax_region->res.start)
free = res->start - dax_region->res.start;
if (free >= to_alloc && dev_size == 0)
return alloc_dev_dax_range(dev_dax, dax_region->res.start, to_alloc);
if (res == first && res->start > dax_region->res.start) {
alloc = min(res->start - dax_region->res.start, to_alloc);
rc = alloc_dev_dax_range(dev_dax, dax_region->res.start, alloc);
break;
}
free = 0;
alloc = 0;
/* space between allocations */
if (next && next->start > res->end + 1)
free = next->start - res->end + 1;
alloc = min(next->start - (res->end + 1), to_alloc);
/* space at the end of the region */
if (free < to_alloc && !next && res->end < region_res->end)
free = region_res->end - res->end;
if (!alloc && !next && res->end < region_res->end)
alloc = min(region_res->end - res->end, to_alloc);
if (free >= to_alloc && strcmp(name, res->name) == 0)
return adjust_dev_dax_range(dev_dax, res, resource_size(res) + to_alloc);
else if (free >= to_alloc && dev_size == 0)
return alloc_dev_dax_range(dev_dax, res->end + 1, to_alloc);
if (!alloc)
continue;
if (adjust_ok(dev_dax, res)) {
rc = adjust_dev_dax_range(dev_dax, res, resource_size(res) + alloc);
break;
}
return -ENOSPC;
rc = alloc_dev_dax_range(dev_dax, res->end + 1, alloc);
break;
}
if (rc)
return rc;
to_alloc -= alloc;
if (to_alloc)
goto retry;
return 0;
}
static ssize_t size_store(struct device *dev, struct device_attribute *attr,
@ -767,8 +884,15 @@ static ssize_t resource_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dev_dax *dev_dax = to_dev_dax(dev);
struct dax_region *dax_region = dev_dax->region;
unsigned long long start;
return sprintf(buf, "%#llx\n", dev_dax->range.start);
if (dev_dax->nr_range < 1)
start = dax_region->res.start;
else
start = dev_dax->ranges[0].range.start;
return sprintf(buf, "%#llx\n", start);
}
static DEVICE_ATTR(resource, 0400, resource_show, NULL);
@ -833,6 +957,7 @@ static void dev_dax_release(struct device *dev)
put_dax(dax_dev);
free_dev_dax_id(dev_dax);
dax_region_put(dax_region);
kfree(dev_dax->ranges);
kfree(dev_dax->pgmap);
kfree(dev_dax);
}
@ -941,7 +1066,7 @@ struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data)
err_alloc_dax:
kfree(dev_dax->pgmap);
err_pgmap:
free_dev_dax_range(dev_dax);
free_dev_dax_ranges(dev_dax);
err_range:
free_dev_dax_id(dev_dax);
err_id:

7
drivers/dax/dax-private.h
View File

@ -49,7 +49,8 @@ struct dax_region {
* @id: ida allocated id
* @dev - device core
* @pgmap - pgmap for memmap setup / lifetime (driver owned)
* @range: resource range for the instance
* @nr_range: size of @ranges
* @ranges: resource-span + pgoff tuples for the instance
*/
struct dev_dax {
struct dax_region *region;
@ -58,7 +59,11 @@ struct dev_dax {
int id;
struct device dev;
struct dev_pagemap *pgmap;
int nr_range;
struct dev_dax_range {
unsigned long pgoff;
struct range range;
} *ranges;
};
static inline struct dev_dax *to_dev_dax(struct device *dev)

51
drivers/dax/device.c
View File

@ -55,15 +55,22 @@ static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
__weak phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff,
unsigned long size)
{
struct range *range = &dev_dax->range;
int i;
for (i = 0; i < dev_dax->nr_range; i++) {
struct dev_dax_range *dax_range = &dev_dax->ranges[i];
struct range *range = &dax_range->range;
unsigned long long pgoff_end;
phys_addr_t phys;
phys = pgoff * PAGE_SIZE + range->start;
if (phys >= range->start && phys <= range->end) {
pgoff_end = dax_range->pgoff + PHYS_PFN(range_len(range)) - 1;
if (pgoff < dax_range->pgoff || pgoff > pgoff_end)
continue;
phys = PFN_PHYS(pgoff - dax_range->pgoff) + range->start;
if (phys + size - 1 <= range->end)
return phys;
break;
}
return -1;
}
@ -395,30 +402,40 @@ static void dev_dax_kill(void *dev_dax)
int dev_dax_probe(struct dev_dax *dev_dax)
{
struct dax_device *dax_dev = dev_dax->dax_dev;
struct range *range = &dev_dax->range;
struct device *dev = &dev_dax->dev;
struct dev_pagemap *pgmap;
struct inode *inode;
struct cdev *cdev;
void *addr;
int rc;
/* 1:1 map region resource range to device-dax instance range */
if (!devm_request_mem_region(dev, range->start, range_len(range),
dev_name(dev))) {
dev_warn(dev, "could not reserve range: %#llx - %#llx\n",
range->start, range->end);
return -EBUSY;
}
int rc, i;
pgmap = dev_dax->pgmap;
if (dev_WARN_ONCE(dev, pgmap && dev_dax->nr_range > 1,
"static pgmap / multi-range device conflict\n"))
return -EINVAL;
if (!pgmap) {
pgmap = devm_kzalloc(dev, sizeof(*pgmap), GFP_KERNEL);
pgmap = devm_kzalloc(dev, sizeof(*pgmap) + sizeof(struct range)
* (dev_dax->nr_range - 1), GFP_KERNEL);
if (!pgmap)
return -ENOMEM;
pgmap->range = *range;
pgmap->nr_range = 1;
pgmap->nr_range = dev_dax->nr_range;
}
for (i = 0; i < dev_dax->nr_range; i++) {
struct range *range = &dev_dax->ranges[i].range;
if (!devm_request_mem_region(dev, range->start,
range_len(range), dev_name(dev))) {
dev_warn(dev, "mapping%d: %#llx-%#llx could not reserve range\n",
i, range->start, range->end);
return -EBUSY;
}
/* don't update the range for static pgmap */
if (!dev_dax->pgmap)
pgmap->ranges[i] = *range;
}
pgmap->type = MEMORY_DEVICE_GENERIC;
addr = devm_memremap_pages(dev, pgmap);
if (IS_ERR(addr))

86
drivers/dax/kmem.c
View File

@ -19,24 +19,28 @@ static const char *kmem_name;
/* Set if any memory will remain added when the driver will be unloaded. */
static bool any_hotremove_failed;
static struct range dax_kmem_range(struct dev_dax *dev_dax)
static int dax_kmem_range(struct dev_dax *dev_dax, int i, struct range *r)
{
struct range range;
struct dev_dax_range *dax_range = &dev_dax->ranges[i];
struct range *range = &dax_range->range;
/* memory-block align the hotplug range */
range.start = ALIGN(dev_dax->range.start, memory_block_size_bytes());
range.end = ALIGN_DOWN(dev_dax->range.end + 1, memory_block_size_bytes()) - 1;
return range;
r->start = ALIGN(range->start, memory_block_size_bytes());
r->end = ALIGN_DOWN(range->end + 1, memory_block_size_bytes()) - 1;
if (r->start >= r->end) {
r->start = range->start;
r->end = range->end;
return -ENOSPC;
}
return 0;
}
static int dev_dax_kmem_probe(struct dev_dax *dev_dax)
{
struct range range = dax_kmem_range(dev_dax);
struct device *dev = &dev_dax->dev;
struct resource *res;
int i, mapped = 0;
char *res_name;
int numa_node;
int rc;
/*
* Ensure good NUMA information for the persistent memory.
@ -55,10 +59,29 @@ static int dev_dax_kmem_probe(struct dev_dax *dev_dax)
if (!res_name)
return -ENOMEM;
for (i = 0; i < dev_dax->nr_range; i++) {
struct resource *res;
struct range range;
int rc;
rc = dax_kmem_range(dev_dax, i, &range);
if (rc) {
dev_info(dev, "mapping%d: %#llx-%#llx too small after alignment\n",
i, range.start, range.end);
continue;
}
/* Region is permanently reserved if hotremove fails. */
res = request_mem_region(range.start, range_len(&range), res_name);
if (!res) {
dev_warn(dev, "could not reserve region [%#llx-%#llx]\n", range.start, range.end);
dev_warn(dev, "mapping%d: %#llx-%#llx could not reserve region\n",
i, range.start, range.end);
/*
* Once some memory has been onlined we can't
* assume that it can be un-onlined safely.
*/
if (mapped)
continue;
kfree(res_name);
return -EBUSY;
}
@ -72,15 +95,23 @@ static int dev_dax_kmem_probe(struct dev_dax *dev_dax)
res->flags = IORESOURCE_SYSTEM_RAM;
/*
* Ensure that future kexec'd kernels will not treat this as RAM
* automatically.
* Ensure that future kexec'd kernels will not treat
* this as RAM automatically.
*/
rc = add_memory_driver_managed(numa_node, range.start, range_len(&range), kmem_name);
rc = add_memory_driver_managed(numa_node, range.start,
range_len(&range), kmem_name);
if (rc) {
dev_warn(dev, "mapping%d: %#llx-%#llx memory add failed\n",
i, range.start, range.end);
release_mem_region(range.start, range_len(&range));
if (mapped)
continue;
kfree(res_name);
return rc;
}
mapped++;
}
dev_set_drvdata(dev, res_name);
@ -90,9 +121,8 @@ static int dev_dax_kmem_probe(struct dev_dax *dev_dax)
#ifdef CONFIG_MEMORY_HOTREMOVE
static int dev_dax_kmem_remove(struct dev_dax *dev_dax)
{
int rc;
int i, success = 0;
struct device *dev = &dev_dax->dev;
struct range range = dax_kmem_range(dev_dax);
const char *res_name = dev_get_drvdata(dev);
/*
@ -101,17 +131,31 @@ static int dev_dax_kmem_remove(struct dev_dax *dev_dax)
* there is no way to hotremove this memory until reboot because device
* unbind will succeed even if we return failure.
*/
rc = remove_memory(dev_dax->target_node, range.start, range_len(&range));
if (rc) {
for (i = 0; i < dev_dax->nr_range; i++) {
struct range range;
int rc;
rc = dax_kmem_range(dev_dax, i, &range);
if (rc)
continue;
rc = remove_memory(dev_dax->target_node, range.start,
range_len(&range));
if (rc == 0) {
release_mem_region(range.start, range_len(&range));
success++;
continue;
}
any_hotremove_failed = true;
dev_err(dev, "%#llx-%#llx cannot be hotremoved until the next reboot\n",
range.start, range.end);
return rc;
dev_err(dev,
"mapping%d: %#llx-%#llx cannot be hotremoved until the next reboot\n",
i, range.start, range.end);
}
/* Release and free dax resources */
release_mem_region(range.start, range_len(&range));
if (success >= dev_dax->nr_range) {
kfree(res_name);
dev_set_drvdata(dev, NULL);
}
return 0;
}

16
tools/testing/nvdimm/dax-dev.c
View File

@ -9,11 +9,18 @@
phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff,
unsigned long size)
{
struct range *range = &dev_dax->range;
int i;
for (i = 0; i < dev_dax->nr_range; i++) {
struct dev_dax_range *dax_range = &dev_dax->ranges[i];
struct range *range = &dax_range->range;
unsigned long long pgoff_end;
phys_addr_t addr;
addr = pgoff * PAGE_SIZE + range->start;
if (addr >= range->start && addr <= range->end) {
pgoff_end = dax_range->pgoff + PHYS_PFN(range_len(range)) - 1;
if (pgoff < dax_range->pgoff || pgoff > pgoff_end)
continue;
addr = PFN_PHYS(pgoff - dax_range->pgoff) + range->start;
if (addr + size - 1 <= range->end) {
if (get_nfit_res(addr)) {
struct page *page;
@ -23,9 +30,10 @@ phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff,
page = vmalloc_to_page((void *)addr);
return PFN_PHYS(page_to_pfn(page));
} else
}
return addr;
}
break;
}
return -1;
}