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path: root/drivers/nvdimm/pmem.c
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Diffstat (limited to 'drivers/nvdimm/pmem.c')
-rw-r--r--drivers/nvdimm/pmem.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index c23649867696..6071e2942053 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -20,6 +20,7 @@
#include <linux/hdreg.h>
#include <linux/init.h>
#include <linux/platform_device.h>
+#include <linux/set_memory.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/badblocks.h>
@@ -51,6 +52,30 @@ static struct nd_region *to_region(struct pmem_device *pmem)
return to_nd_region(to_dev(pmem)->parent);
}
+static void hwpoison_clear(struct pmem_device *pmem,
+ phys_addr_t phys, unsigned int len)
+{
+ unsigned long pfn_start, pfn_end, pfn;
+
+ /* only pmem in the linear map supports HWPoison */
+ if (is_vmalloc_addr(pmem->virt_addr))
+ return;
+
+ pfn_start = PHYS_PFN(phys);
+ pfn_end = pfn_start + PHYS_PFN(len);
+ for (pfn = pfn_start; pfn < pfn_end; pfn++) {
+ struct page *page = pfn_to_page(pfn);
+
+ /*
+ * Note, no need to hold a get_dev_pagemap() reference
+ * here since we're in the driver I/O path and
+ * outstanding I/O requests pin the dev_pagemap.
+ */
+ if (test_and_clear_pmem_poison(page))
+ clear_mce_nospec(pfn);
+ }
+}
+
static blk_status_t pmem_clear_poison(struct pmem_device *pmem,
phys_addr_t offset, unsigned int len)
{
@@ -65,6 +90,7 @@ static blk_status_t pmem_clear_poison(struct pmem_device *pmem,
if (cleared < len)
rc = BLK_STS_IOERR;
if (cleared > 0 && cleared / 512) {
+ hwpoison_clear(pmem, pmem->phys_addr + offset, cleared);
cleared /= 512;
dev_dbg(dev, "%#llx clear %ld sector%s\n",
(unsigned long long) sector, cleared,