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libnvdimm, region: fix flush hint table thinko

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The definition of the flush hint table as:

	void __iomem *flush_wpq[0][0];

...passed the unit test, but is broken as flush_wpq[0][1] and
flush_wpq[1][0] refer to the same entry.  Fix this to use a helper that
calculates a slot in the table based on the geometry of flush hints in
the region.  This is important to get right since virtualization
solutions use this mechanism to trigger hypervisor flushes to platform
persistence.

Reported-by: Dave Jiang <dave.jiang@intel.com>
Tested-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2016-09-23 17:53:52 -07:00
parent 11294d63ac
commit 595c73071e
2 changed files with 32 additions and 10 deletions
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22
drivers/nvdimm/nd.h
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@@ -52,10 +52,28 @@ struct nvdimm_drvdata {
struct nd_region_data {
int ns_count;
int ns_active;
unsigned int flush_mask;
void __iomem *flush_wpq[0][0];
unsigned int hints_shift;
void __iomem *flush_wpq[0];
};
static inline void __iomem *ndrd_get_flush_wpq(struct nd_region_data *ndrd,
int dimm, int hint)
{
unsigned int num = 1 << ndrd->hints_shift;
unsigned int mask = num - 1;
return ndrd->flush_wpq[dimm * num + (hint & mask)];
}
static inline void ndrd_set_flush_wpq(struct nd_region_data *ndrd, int dimm,
int hint, void __iomem *flush)
{
unsigned int num = 1 << ndrd->hints_shift;
unsigned int mask = num - 1;
ndrd->flush_wpq[dimm * num + (hint & mask)] = flush;
}
static inline struct nd_namespace_index *to_namespace_index(
struct nvdimm_drvdata *ndd, int i)
{