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authorDan Williams <dan.j.williams@intel.com>2020-10-13 16:49:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-13 18:38:28 -0700
commit59bc8d10dc417884a3bc18a092a62e13645ed044 (patch)
tree5693307df1be9277241f6f8424b724004fd074ed /drivers
parentf5516ec5efb9fe0f426a46eeef25d389d3c2f988 (diff)
device-dax/kmem: introduce dax_kmem_range()
Towards removing the mode specific @dax_kmem_res attribute from the generic 'struct dev_dax', and preparing for multi-range support, teach the driver to calculate the hotplug range from the device range. The hotplug range is the trivially calculated memory-block-size aligned version of the device range. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: David Hildenbrand <david@redhat.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Pavel Tatashin <pasha.tatashin@soleen.com> Cc: Brice Goglin <Brice.Goglin@inria.fr> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Ira Weiny <ira.weiny@intel.com> Cc: Jia He <justin.he@arm.com> Cc: Joao Martins <joao.m.martins@oracle.com> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com> 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: Catalin Marinas <catalin.marinas@arm.com> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: David Airlie <airlied@linux.ie> 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: Jason Gunthorpe <jgg@mellanox.com> Cc: Jason Yan <yanaijie@huawei.com> Cc: Jeff Moyer <jmoyer@redhat.com> Cc: "Jérôme Glisse" <jglisse@redhat.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: 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: 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/160106111109.30709.3173462396758431559.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/dax/kmem.c40
1 files changed, 17 insertions, 23 deletions
diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c
index 5bb133df147d..b0d6a99cf12d 100644
--- a/drivers/dax/kmem.c
+++ b/drivers/dax/kmem.c
@@ -19,13 +19,20 @@ 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)
+{
+ struct 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;
+}
+
int dev_dax_kmem_probe(struct device *dev)
{
struct dev_dax *dev_dax = to_dev_dax(dev);
- struct range *range = &dev_dax->range;
- resource_size_t kmem_start;
- resource_size_t kmem_size;
- resource_size_t kmem_end;
+ struct range range = dax_kmem_range(dev_dax);
struct resource *new_res;
const char *new_res_name;
int numa_node;
@@ -44,25 +51,14 @@ int dev_dax_kmem_probe(struct device *dev)
return -EINVAL;
}
- /* Hotplug starting at the beginning of the next block: */
- kmem_start = ALIGN(range->start, memory_block_size_bytes());
-
- kmem_size = range_len(range);
- /* Adjust the size down to compensate for moving up kmem_start: */
- kmem_size -= kmem_start - range->start;
- /* Align the size down to cover only complete blocks: */
- kmem_size &= ~(memory_block_size_bytes() - 1);
- kmem_end = kmem_start + kmem_size;
-
new_res_name = kstrdup(dev_name(dev), GFP_KERNEL);
if (!new_res_name)
return -ENOMEM;
/* Region is permanently reserved if hotremove fails. */
- new_res = request_mem_region(kmem_start, kmem_size, new_res_name);
+ new_res = request_mem_region(range.start, range_len(&range), new_res_name);
if (!new_res) {
- dev_warn(dev, "could not reserve region [%pa-%pa]\n",
- &kmem_start, &kmem_end);
+ dev_warn(dev, "could not reserve region [%#llx-%#llx]\n", range.start, range.end);
kfree(new_res_name);
return -EBUSY;
}
@@ -96,9 +92,8 @@ int dev_dax_kmem_probe(struct device *dev)
static int dev_dax_kmem_remove(struct device *dev)
{
struct dev_dax *dev_dax = to_dev_dax(dev);
+ struct range range = dax_kmem_range(dev_dax);
struct resource *res = dev_dax->dax_kmem_res;
- resource_size_t kmem_start = res->start;
- resource_size_t kmem_size = resource_size(res);
const char *res_name = res->name;
int rc;
@@ -108,12 +103,11 @@ static int dev_dax_kmem_remove(struct device *dev)
* 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, kmem_start, kmem_size);
+ rc = remove_memory(dev_dax->target_node, range.start, range_len(&range));
if (rc) {
any_hotremove_failed = true;
- dev_err(dev,
- "DAX region %pR cannot be hotremoved until the next reboot\n",
- res);
+ dev_err(dev, "%#llx-%#llx cannot be hotremoved until the next reboot\n",
+ range.start, range.end);
return rc;
}