Messages in this thread Patch in this message | | | From | Toshi Kani <> | Subject | [PATCH v12 10/10] drivers/block/pmem: Map NVDIMM with ioremap_wt() | Date | Mon, 1 Jun 2015 13:36:33 -0600 |
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The pmem driver maps NVDIMM with ioremap_nocache() as we cannot write back the contents of the CPU caches in case of a crash.
This patch changes to use ioremap_wt(), which provides uncached writes but cached reads, for improving read performance.
Signed-off-by: Toshi Kani <toshi.kani@hp.com> Acked-by: Dan Williams <dan.j.williams@intel.com> --- drivers/block/pmem.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/block/pmem.c b/drivers/block/pmem.c index eabf4a8..095dfaa 100644 --- a/drivers/block/pmem.c +++ b/drivers/block/pmem.c @@ -139,11 +139,11 @@ static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res) } /* - * Map the memory as non-cachable, as we can't write back the contents + * Map the memory as write-through, as we can't write back the contents * of the CPU caches in case of a crash. */ err = -ENOMEM; - pmem->virt_addr = ioremap_nocache(pmem->phys_addr, pmem->size); + pmem->virt_addr = ioremap_wt(pmem->phys_addr, pmem->size); if (!pmem->virt_addr) goto out_release_region;
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