From d4f323672aa63713b7ca26da418f66cc30d3a41a Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Thu, 3 Mar 2016 16:08:54 -0800 Subject: nfit, libnvdimm: clear poison command support Add the boiler-plate for a 'clear error' command based on section 9.20.7.6 "Function Index 4 - Clear Uncorrectable Error" from the ACPI 6.1 specification, and add a reference implementation in nfit_test. Reviewed-by: Vishal Verma Signed-off-by: Dan Williams diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c index 0def4eb..c067d74 100644 --- a/drivers/acpi/nfit.c +++ b/drivers/acpi/nfit.c @@ -87,6 +87,7 @@ static struct acpi_device *to_acpi_dev(struct acpi_nfit_desc *acpi_desc) static int xlat_status(void *buf, unsigned int cmd) { + struct nd_cmd_clear_error *clear_err; struct nd_cmd_ars_status *ars_status; struct nd_cmd_ars_start *ars_start; struct nd_cmd_ars_cap *ars_cap; @@ -149,6 +150,15 @@ static int xlat_status(void *buf, unsigned int cmd) if (ars_status->status >> 16) return -EIO; break; + case ND_CMD_CLEAR_ERROR: + clear_err = buf; + if (clear_err->status & 0xffff) + return -EIO; + if (!clear_err->cleared) + return -EIO; + if (clear_err->length > clear_err->cleared) + return clear_err->cleared; + break; default: break; } @@ -1002,7 +1012,7 @@ static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc) if (!adev) return; - for (i = ND_CMD_ARS_CAP; i <= ND_CMD_ARS_STATUS; i++) + for (i = ND_CMD_ARS_CAP; i <= ND_CMD_CLEAR_ERROR; i++) if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i)) set_bit(i, &nd_desc->dsm_mask); } diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c index 2e9ac22..cb6fd64 100644 --- a/drivers/nvdimm/bus.c +++ b/drivers/nvdimm/bus.c @@ -421,6 +421,12 @@ static const struct nd_cmd_desc __nd_cmd_bus_descs[] = { .out_num = 3, .out_sizes = { 4, 4, UINT_MAX, }, }, + [ND_CMD_CLEAR_ERROR] = { + .in_num = 2, + .in_sizes = { 8, 8, }, + .out_num = 3, + .out_sizes = { 4, 4, 8, }, + }, }; const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd) @@ -489,6 +495,13 @@ void wait_nvdimm_bus_probe_idle(struct device *dev) } while (true); } +static int pmem_active(struct device *dev, void *data) +{ + if (is_nd_pmem(dev) && dev->driver) + return -EBUSY; + return 0; +} + /* set_config requires an idle interleave set */ static int nd_cmd_clear_to_send(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, unsigned int cmd) @@ -503,6 +516,11 @@ static int nd_cmd_clear_to_send(struct nvdimm_bus *nvdimm_bus, return rc; } + /* require clear error to go through the pmem driver */ + if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR) + return device_for_each_child(&nvdimm_bus->dev, NULL, + pmem_active); + if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA) return 0; @@ -551,6 +569,7 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, case ND_CMD_VENDOR: case ND_CMD_SET_CONFIG_DATA: case ND_CMD_ARS_START: + case ND_CMD_CLEAR_ERROR: dev_dbg(&nvdimm_bus->dev, "'%s' command while read-only.\n", nvdimm ? nvdimm_cmd_name(cmd) : nvdimm_bus_cmd_name(cmd)); diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h index cc68b921..7cc28ab 100644 --- a/include/uapi/linux/ndctl.h +++ b/include/uapi/linux/ndctl.h @@ -98,6 +98,14 @@ struct nd_cmd_ars_status { } __packed records[0]; } __packed; +struct nd_cmd_clear_error { + __u64 address; + __u64 length; + __u32 status; + __u8 reserved[4]; + __u64 cleared; +} __packed; + enum { ND_CMD_IMPLEMENTED = 0, @@ -105,6 +113,7 @@ enum { ND_CMD_ARS_CAP = 1, ND_CMD_ARS_START = 2, ND_CMD_ARS_STATUS = 3, + ND_CMD_CLEAR_ERROR = 4, /* per-dimm commands */ ND_CMD_SMART = 1, @@ -129,6 +138,7 @@ static inline const char *nvdimm_bus_cmd_name(unsigned cmd) [ND_CMD_ARS_CAP] = "ars_cap", [ND_CMD_ARS_START] = "ars_start", [ND_CMD_ARS_STATUS] = "ars_status", + [ND_CMD_CLEAR_ERROR] = "clear_error", }; if (cmd < ARRAY_SIZE(names) && names[cmd]) @@ -187,6 +197,9 @@ static inline const char *nvdimm_cmd_name(unsigned cmd) #define ND_IOCTL_ARS_STATUS _IOWR(ND_IOCTL, ND_CMD_ARS_STATUS,\ struct nd_cmd_ars_status) +#define ND_IOCTL_CLEAR_ERROR _IOWR(ND_IOCTL, ND_CMD_CLEAR_ERROR,\ + struct nd_cmd_clear_error) + #define ND_DEVICE_DIMM 1 /* nd_dimm: container for "config data" */ #define ND_DEVICE_REGION_PMEM 2 /* nd_region: (parent of PMEM namespaces) */ #define ND_DEVICE_REGION_BLK 3 /* nd_region: (parent of BLK namespaces) */ diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c index 1555c09..3187322 100644 --- a/tools/testing/nvdimm/test/nfit.c +++ b/tools/testing/nvdimm/test/nfit.c @@ -223,6 +223,7 @@ static int nfit_test_cmd_set_config_data(struct nd_cmd_set_config_hdr *nd_cmd, } #define NFIT_TEST_ARS_RECORDS 4 +#define NFIT_TEST_CLEAR_ERR_UNIT 256 static int nfit_test_cmd_ars_cap(struct nd_cmd_ars_cap *nd_cmd, unsigned int buf_len) @@ -233,6 +234,7 @@ static int nfit_test_cmd_ars_cap(struct nd_cmd_ars_cap *nd_cmd, nd_cmd->max_ars_out = sizeof(struct nd_cmd_ars_status) + NFIT_TEST_ARS_RECORDS * sizeof(struct nd_ars_record); nd_cmd->status = (ND_ARS_PERSISTENT | ND_ARS_VOLATILE) << 16; + nd_cmd->clear_err_unit = NFIT_TEST_CLEAR_ERR_UNIT; return 0; } @@ -306,6 +308,28 @@ static int nfit_test_cmd_ars_status(struct ars_state *ars_state, return 0; } +static int nfit_test_cmd_clear_error(struct nd_cmd_clear_error *clear_err, + unsigned int buf_len, int *cmd_rc) +{ + const u64 mask = NFIT_TEST_CLEAR_ERR_UNIT - 1; + if (buf_len < sizeof(*clear_err)) + return -EINVAL; + + if ((clear_err->address & mask) || (clear_err->length & mask)) + return -EINVAL; + + /* + * Report 'all clear' success for all commands even though a new + * scrub will find errors again. This is enough to have the + * error removed from the 'badblocks' tracking in the pmem + * driver. + */ + clear_err->status = 0; + clear_err->cleared = clear_err->length; + *cmd_rc = 0; + return 0; +} + static int nfit_test_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm, unsigned int cmd, void *buf, unsigned int buf_len, int *cmd_rc) @@ -365,6 +389,9 @@ static int nfit_test_ctl(struct nvdimm_bus_descriptor *nd_desc, rc = nfit_test_cmd_ars_status(ars_state, buf, buf_len, cmd_rc); break; + case ND_CMD_CLEAR_ERROR: + rc = nfit_test_cmd_clear_error(buf, buf_len, cmd_rc); + break; default: return -ENOTTY; } @@ -1230,6 +1257,7 @@ static void nfit_test0_setup(struct nfit_test *t) set_bit(ND_CMD_ARS_CAP, &acpi_desc->bus_dsm_force_en); set_bit(ND_CMD_ARS_START, &acpi_desc->bus_dsm_force_en); set_bit(ND_CMD_ARS_STATUS, &acpi_desc->bus_dsm_force_en); + set_bit(ND_CMD_CLEAR_ERROR, &acpi_desc->bus_dsm_force_en); } static void nfit_test1_setup(struct nfit_test *t) @@ -1290,6 +1318,7 @@ static void nfit_test1_setup(struct nfit_test *t) set_bit(ND_CMD_ARS_CAP, &acpi_desc->bus_dsm_force_en); set_bit(ND_CMD_ARS_START, &acpi_desc->bus_dsm_force_en); set_bit(ND_CMD_ARS_STATUS, &acpi_desc->bus_dsm_force_en); + set_bit(ND_CMD_CLEAR_ERROR, &acpi_desc->bus_dsm_force_en); } static int nfit_test_blk_do_io(struct nd_blk_region *ndbr, resource_size_t dpa, -- cgit v0.10.2