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authorDan Williams <dan.j.williams@intel.com>2018-11-09 12:43:07 -0800
committerDan Williams <dan.j.williams@intel.com>2019-01-06 21:41:57 -0800
commit8fc5c73554db0ac18c0c6ac5b2099ab917f83bdf (patch)
tree6e6ef5bfbea9e4a63a784f658b9e7138e278be34 /drivers/dax/bus.c
parent730926c3b0998943654019f00296cf8e3b02277e (diff)
acpi/nfit, device-dax: Identify differentiated memory with a unique numa-node
Persistent memory, as described by the ACPI NFIT (NVDIMM Firmware Interface Table), is the first known instance of a memory range described by a unique "target" proximity domain. Where "initiator" and "target" proximity domains is an approach that the ACPI HMAT (Heterogeneous Memory Attributes Table) uses to described the unique performance properties of a memory range relative to a given initiator (e.g. CPU or DMA device). Currently the numa-node for a /dev/pmemX block-device or /dev/daxX.Y char-device follows the traditional notion of 'numa-node' where the attribute conveys the closest online numa-node. That numa-node attribute is useful for cpu-binding and memory-binding processes *near* the device. However, when the memory range backing a 'pmem', or 'dax' device is onlined (memory hot-add) the memory-only-numa-node representing that address needs to be differentiated from the set of online nodes. In other words, the numa-node association of the device depends on whether you can bind processes *near* the cpu-numa-node in the offline device-case, or bind process *on* the memory-range directly after the backing address range is onlined. Allow for the case that platform firmware describes persistent memory with a unique proximity domain, i.e. when it is distinct from the proximity of DRAM and CPUs that are on the same socket. Plumb the Linux numa-node translation of that proximity through the libnvdimm region device to namespaces that are in device-dax mode. With this in place the proposed kmem driver [1] can optionally discover a unique numa-node number for the address range as it transitions the memory from an offline state managed by a device-driver to an online memory range managed by the core-mm. [1]: https://lore.kernel.org/lkml/20181022201317.8558C1D8@viggo.jf.intel.com Reported-by: Fan Du <fan.du@intel.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: "Oliver O'Halloran" <oohall@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Jérôme Glisse <jglisse@redhat.com> Reviewed-by: Yang Shi <yang.shi@linux.alibaba.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax/bus.c')
-rw-r--r--drivers/dax/bus.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
index 568168500217..c620ad52d7e5 100644
--- a/drivers/dax/bus.c
+++ b/drivers/dax/bus.c
@@ -214,7 +214,7 @@ static void dax_region_unregister(void *region)
}
struct dax_region *alloc_dax_region(struct device *parent, int region_id,
- struct resource *res, unsigned int align,
+ struct resource *res, int target_node, unsigned int align,
unsigned long pfn_flags)
{
struct dax_region *dax_region;
@@ -244,6 +244,7 @@ struct dax_region *alloc_dax_region(struct device *parent, int region_id,
dax_region->id = region_id;
dax_region->align = align;
dax_region->dev = parent;
+ dax_region->target_node = target_node;
if (sysfs_create_groups(&parent->kobj, dax_region_attribute_groups)) {
kfree(dax_region);
return NULL;
@@ -348,6 +349,7 @@ struct dev_dax *__devm_create_dev_dax(struct dax_region *dax_region, int id,
dev_dax->dax_dev = dax_dev;
dev_dax->region = dax_region;
+ dev_dax->target_node = dax_region->target_node;
kref_get(&dax_region->kref);
inode = dax_inode(dax_dev);