On Thu, 2018-07-12 at 09:47 -0600, Keith Busch wrote:
> This patch will find the max contiguous area to determine the largest
> pmem namespace size that can be created. If the requested size exceeds
> the largest available, ENOSPC error will be returned.
>
> This fixes the allocation underrun error and wrong error return code
> that have otherwise been observed as the following kernel warning:
>
> WARNING: CPU: <CPU> PID: <PID> at drivers/nvdimm/namespace_devs.c:913
> size_store
>
> Fixes: a1f3e4d6a0c3 ("libnvdimm, region: update nd_region_available_dpa() for
> multi-pmem support")
> Cc: <sta...@vger.kernel.org>
> Signed-off-by: Keith Busch <keith.bu...@intel.com>
Hi Keith,
I was testing these patches and I found:
When booting a VM which has both, a qemu ACPI.NFIT bus, and nfit_test
buses, initially the nfit_test buses show correct max_available_extent.
But the qemu ACPI.NFIT bus regions (which have an automatic full-
capacity namespace created on them when they come up) show
max_available_extent of the full region size, even as the
available_size attr is zero.
$ cat /sys/bus/nd/devices/region1/max_available_extent
17045651456
$ ndctl list -BNR --region=region1
[
{
"provider":"ACPI.NFIT",
"dev":"ndbus1",
"regions":[
{
"dev":"region1",
"size":17045651456,
"available_size":0,
"type":"pmem",
"numa_node":0,
"persistence_domain":"unknown",
"namespaces":[
{
"dev":"namespace1.0",
"mode":"raw",
"size":17045651456,
"sector_size":512,
"blockdev":"pmem1",
"numa_node":0
}
...
If i reconfig the default namespace:
$ sudo ndctl create-namespace --region=region1 --type=pmem --
reconfig=namespace1.0 --type=pmem --mode=fsdax --force
{
"dev":"namespace1.0",
"mode":"fsdax",
"map":"dev",
"size":"15.63 GiB (16.78 GB)",
"uuid":"55411e87-41a6-44e0-8198-97023de70413",
"raw_uuid":"cb80c5c1-c582-4e12-9d24-2fd30bb7da20",
"sector_size":512,
"blockdev":"pmem1",
"numa_node":0
}
Then the max_available_extent gets updated correctly:
$ cat /sys/bus/nd/devices/region1/max_available_extent
0
> ---
> v2 -> v3:
>
> This one takes block regions into account by reserving pmem regions
> on dimms and finding the largest intersection among all dimms in
> the region.
>
> drivers/nvdimm/dimm_devs.c | 30 ++++++++++++++++++++++++++++++
> drivers/nvdimm/namespace_devs.c | 6 +++---
> drivers/nvdimm/nd-core.h | 9 +++++++++
> drivers/nvdimm/region_devs.c | 24 ++++++++++++++++++++++++
> 4 files changed, 66 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
> index 8d348b22ba45..9e977cbd1a60 100644
> --- a/drivers/nvdimm/dimm_devs.c
> +++ b/drivers/nvdimm/dimm_devs.c
> @@ -536,6 +536,36 @@ resource_size_t nd_blk_available_dpa(struct nd_region
> *nd_region)
> return info.available;
> }
>
> +/**
> + * nd_pmem_max_contiguous_dpa - For the given dimm+region, return the max
> + * contiguous unallocated dpa range.
> + * @nd_region: constrain available space check to this reference region
> + * @nd_mapping: container of dpa-resource-root + labels
> + */
> +resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
> + struct nd_mapping *nd_mapping)
> +{
> + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
> + struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
> + resource_size_t max = 0;
> + struct resource *res;
> +
> + /* if a dimm is disabled the available capacity is zero */
> + if (!ndd)
> + return 0;
> +
> + if (reserve_free_pmem(nvdimm_bus, nd_mapping))
> + return 0;
> + for_each_dpa_resource(ndd, res) {
> + if (strcmp(res->name, "pmem-reserve") != 0)
> + continue;
> + if (resource_size(res) > max)
> + max = resource_size(res);
> + }
> + release_free_pmem(nvdimm_bus, nd_mapping);
> + return max;
> +}
> +
> /**
> * nd_pmem_available_dpa - for the given dimm+region account unallocated dpa
> * @nd_mapping: container of dpa-resource-root + labels
> diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
> index 28afdd668905..c3afff2cdf1d 100644
> --- a/drivers/nvdimm/namespace_devs.c
> +++ b/drivers/nvdimm/namespace_devs.c
> @@ -836,7 +836,7 @@ static int __reserve_free_pmem(struct device *dev, void
> *data)
> return 0;
> }
>
> -static void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
> +void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
> struct nd_mapping *nd_mapping)
> {
> struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
> @@ -847,7 +847,7 @@ static void release_free_pmem(struct nvdimm_bus
> *nvdimm_bus,
> nvdimm_free_dpa(ndd, res);
> }
>
> -static int reserve_free_pmem(struct nvdimm_bus *nvdimm_bus,
> +int reserve_free_pmem(struct nvdimm_bus *nvdimm_bus,
> struct nd_mapping *nd_mapping)
> {
> struct nvdimm *nvdimm = nd_mapping->nvdimm;
> @@ -1032,7 +1032,7 @@ static ssize_t __size_store(struct device *dev,
> unsigned long long val)
>
> allocated += nvdimm_allocated_dpa(ndd, &label_id);
> }
> - available = nd_region_available_dpa(nd_region);
> + available = nd_region_allocatable_dpa(nd_region);
>
> if (val > available + allocated)
> return -ENOSPC;
> diff --git a/drivers/nvdimm/nd-core.h b/drivers/nvdimm/nd-core.h
> index 79274ead54fb..1c5f5b389940 100644
> --- a/drivers/nvdimm/nd-core.h
> +++ b/drivers/nvdimm/nd-core.h
> @@ -100,6 +100,15 @@ struct nd_region;
> struct nvdimm_drvdata;
> struct nd_mapping;
> void nd_mapping_free_labels(struct nd_mapping *nd_mapping);
> +
> +int reserve_free_pmem(struct nvdimm_bus *nvdimm_bus,
> + struct nd_mapping *nd_mapping);
> +void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
> + struct nd_mapping *nd_mapping);
> +
> +resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
> + struct nd_mapping *nd_mapping);
> +resource_size_t nd_region_allocatable_dpa(struct nd_region *nd_region);
> resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
> struct nd_mapping *nd_mapping, resource_size_t *overlap);
> resource_size_t nd_blk_available_dpa(struct nd_region *nd_region);
> diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
> index ec3543b83330..c30d5af02cc2 100644
> --- a/drivers/nvdimm/region_devs.c
> +++ b/drivers/nvdimm/region_devs.c
> @@ -389,6 +389,30 @@ resource_size_t nd_region_available_dpa(struct nd_region
> *nd_region)
> return available;
> }
>
> +resource_size_t nd_region_allocatable_dpa(struct nd_region *nd_region)
> +{
> + resource_size_t available = 0;
> + int i;
> +
> + if (is_memory(&nd_region->dev))
> + available = PHYS_ADDR_MAX;
> +
> + WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
> + for (i = 0; i < nd_region->ndr_mappings; i++) {
> + struct nd_mapping *nd_mapping = &nd_region->mapping[i];
> +
> + if (is_memory(&nd_region->dev))
> + available = min(available,
> + nd_pmem_max_contiguous_dpa(nd_region,
> + nd_mapping));
> + else if (is_nd_blk(&nd_region->dev))
> + available += nd_blk_available_dpa(nd_region);
> + }
> + if (is_memory(&nd_region->dev))
> + return available * nd_region->ndr_mappings;
> + return available;
> +}
> +
> static ssize_t available_size_show(struct device *dev,
> struct device_attribute *attr, char *buf)
> {
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