From 59e6473980f321c16299e12db69d1fabc2644a6f Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Mar 2016 07:16:07 -0800 Subject: libnvdimm, pmem: clear poison on write If a write is directed at a known bad block perform the following: 1/ write the data 2/ send a clear poison command 3/ invalidate the poison out of the cache hierarchy Cc: Cc: Ross Zwisler Reviewed-by: Vishal Verma Signed-off-by: Dan Williams --- drivers/nvdimm/bus.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) (limited to 'drivers/nvdimm/bus.c') diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c index cb6fd64b13e3..33557481d452 100644 --- a/drivers/nvdimm/bus.c +++ b/drivers/nvdimm/bus.c @@ -159,6 +159,52 @@ void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event) } EXPORT_SYMBOL_GPL(nvdimm_region_notify); +long nvdimm_clear_poison(struct device *dev, phys_addr_t phys, + unsigned int len) +{ + struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); + struct nvdimm_bus_descriptor *nd_desc; + struct nd_cmd_clear_error clear_err; + struct nd_cmd_ars_cap ars_cap; + u32 clear_err_unit, mask; + int cmd_rc, rc; + + if (!nvdimm_bus) + return -ENXIO; + + nd_desc = nvdimm_bus->nd_desc; + if (!nd_desc->ndctl) + return -ENXIO; + + memset(&ars_cap, 0, sizeof(ars_cap)); + ars_cap.address = phys; + ars_cap.length = len; + rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, &ars_cap, + sizeof(ars_cap), &cmd_rc); + if (rc < 0) + return rc; + if (cmd_rc < 0) + return cmd_rc; + clear_err_unit = ars_cap.clear_err_unit; + if (!clear_err_unit || !is_power_of_2(clear_err_unit)) + return -ENXIO; + + mask = clear_err_unit - 1; + if ((phys | len) & mask) + return -ENXIO; + memset(&clear_err, 0, sizeof(clear_err)); + clear_err.address = phys; + clear_err.length = len; + rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_CLEAR_ERROR, &clear_err, + sizeof(clear_err), &cmd_rc); + if (rc < 0) + return rc; + if (cmd_rc < 0) + return cmd_rc; + return clear_err.cleared; +} +EXPORT_SYMBOL_GPL(nvdimm_clear_poison); + static struct bus_type nvdimm_bus_type = { .name = "nd", .uevent = nvdimm_bus_uevent, -- cgit v1.2.3