[PATCH 0/5] libnvdimm: fix locked status detection

[PATCH 0/5] libnvdimm: fix locked status detection

[Dan Williams]

The new ACPI _LSx methods moved the 'dimm locked' error status from the
result of ND_CMD_GET_CONFIG_SIZE to an error status result of
ND_CMD_GET_CONFIG_DATA. Error code translation prevents the proper error
code from making it back to the 'nd_dimm' driver.

Fix the error code propagation and add some unit test infrastructure for
regression testing this case.

---

Dan Williams (5):
      libnvdimm, dimm: handle EACCES failures from label reads
      tools/testing/nvdimm: allow custom error code injection
      tools/testing/nvdimm: support nfit_test_dimm attributes under nfit_test.1
      tools/testing/nvdimm: fix missing newline in nfit_test_dimm 'handle' attribute
      tools/testing/nvdimm: enable labels for nfit_test.1 dimms


 drivers/nvdimm/dimm_devs.c       |   22 +++++-----
 tools/testing/nvdimm/test/nfit.c |   84 +++++++++++++++++++++++++++++---------
 2 files changed, 77 insertions(+), 29 deletions(-)

[PATCH 1/5] libnvdimm, dimm: handle EACCES failures from label reads

[Dan Williams]

The new support for the standard _LSR and _LSW methods neglected to also
update the nvdimm_init_config_data() and nvdimm_set_config_data() to
return the translated error code from failed commands. This precision is
necessary because the locked status that was previously returned on
ND_CMD_GET_CONFIG_SIZE commands is now returned on
ND_CMD_{GET,SET}_CONFIG_DATA commands.

If the kernel misses this indication it can inadvertently fall back to
label-less mode when it should otherwise avoid all access to locked
regions.

Cc: <stable@vger.kernel.org>
Fixes: 4b27db7e26cd ("acpi, nfit: add support for the _LSI, _LSR, and...")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/nvdimm/dimm_devs.c |   22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index e00d45522b80..8d348b22ba45 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -88,9 +88,9 @@ int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd)
 int nvdimm_init_config_data(struct nvdimm_drvdata *ndd)
 {
 	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
+	int rc = validate_dimm(ndd), cmd_rc = 0;
 	struct nd_cmd_get_config_data_hdr *cmd;
 	struct nvdimm_bus_descriptor *nd_desc;
-	int rc = validate_dimm(ndd);
 	u32 max_cmd_size, config_size;
 	size_t offset;
 
@@ -124,9 +124,11 @@ int nvdimm_init_config_data(struct nvdimm_drvdata *ndd)
 		cmd->in_offset = offset;
 		rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
 				ND_CMD_GET_CONFIG_DATA, cmd,
-				cmd->in_length + sizeof(*cmd), NULL);
-		if (rc || cmd->status) {
-			rc = -ENXIO;
+				cmd->in_length + sizeof(*cmd), &cmd_rc);
+		if (rc < 0)
+			break;
+		if (cmd_rc < 0) {
+			rc = cmd_rc;
 			break;
 		}
 		memcpy(ndd->data + offset, cmd->out_buf, cmd->in_length);
@@ -140,9 +142,9 @@ int nvdimm_init_config_data(struct nvdimm_drvdata *ndd)
 int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
 		void *buf, size_t len)
 {
-	int rc = validate_dimm(ndd);
 	size_t max_cmd_size, buf_offset;
 	struct nd_cmd_set_config_hdr *cmd;
+	int rc = validate_dimm(ndd), cmd_rc = 0;
 	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
 	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
 
@@ -164,7 +166,6 @@ int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
 	for (buf_offset = 0; len; len -= cmd->in_length,
 			buf_offset += cmd->in_length) {
 		size_t cmd_size;
-		u32 *status;
 
 		cmd->in_offset = offset + buf_offset;
 		cmd->in_length = min(max_cmd_size, len);
@@ -172,12 +173,13 @@ int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
 
 		/* status is output in the last 4-bytes of the command buffer */
 		cmd_size = sizeof(*cmd) + cmd->in_length + sizeof(u32);
-		status = ((void *) cmd) + cmd_size - sizeof(u32);
 
 		rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
-				ND_CMD_SET_CONFIG_DATA, cmd, cmd_size, NULL);
-		if (rc || *status) {
-			rc = rc ? rc : -ENXIO;
+				ND_CMD_SET_CONFIG_DATA, cmd, cmd_size, &cmd_rc);
+		if (rc < 0)
+			break;
+		if (cmd_rc < 0) {
+			rc = cmd_rc;
 			break;
 		}
 	}

[PATCH 2/5] tools/testing/nvdimm: allow custom error code injection

[Dan Williams]

Given that libnvdimm driver stack takes specific actions on DIMM command
error codes like -EACCES, provide a facility to inject custom failures.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 tools/testing/nvdimm/test/nfit.c |   38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c
index cb166be4918d..dc6cf5630280 100644
--- a/tools/testing/nvdimm/test/nfit.c
+++ b/tools/testing/nvdimm/test/nfit.c
@@ -138,6 +138,7 @@ static u32 handle[] = {
 };
 
 static unsigned long dimm_fail_cmd_flags[NUM_DCR];
+static int dimm_fail_cmd_code[NUM_DCR];
 
 struct nfit_test_fw {
 	enum intel_fw_update_state state;
@@ -892,8 +893,11 @@ static int get_dimm(struct nfit_mem *nfit_mem, unsigned int func)
 	if (i >= ARRAY_SIZE(handle))
 		return -ENXIO;
 
-	if ((1 << func) & dimm_fail_cmd_flags[i])
+	if ((1 << func) & dimm_fail_cmd_flags[i]) {
+		if (dimm_fail_cmd_code[i])
+			return dimm_fail_cmd_code[i];
 		return -EIO;
+	}
 
 	return i;
 }
@@ -1225,8 +1229,40 @@ static ssize_t fail_cmd_store(struct device *dev, struct device_attribute *attr,
 }
 static DEVICE_ATTR_RW(fail_cmd);
 
+static ssize_t fail_cmd_code_show(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	int dimm = dimm_name_to_id(dev);
+
+	if (dimm < 0)
+		return dimm;
+
+	return sprintf(buf, "%d\n", dimm_fail_cmd_code[dimm]);
+}
+
+static ssize_t fail_cmd_code_store(struct device *dev, struct device_attribute *attr,
+		const char *buf, size_t size)
+{
+	int dimm = dimm_name_to_id(dev);
+	unsigned long val;
+	ssize_t rc;
+
+	if (dimm < 0)
+		return dimm;
+
+	rc = kstrtol(buf, 0, &val);
+	if (rc)
+		return rc;
+
+	dimm_fail_cmd_code[dimm] = val;
+	return size;
+}
+static DEVICE_ATTR_RW(fail_cmd_code);
+
+
 static struct attribute *nfit_test_dimm_attributes[] = {
 	&dev_attr_fail_cmd.attr,
+	&dev_attr_fail_cmd_code.attr,
 	&dev_attr_handle.attr,
 	NULL,
 };

[PATCH 3/5] tools/testing/nvdimm: support nfit_test_dimm attributes under nfit_test.1

[Dan Williams]

The nfit_test.1 bus provides a pmem topology without blk-aperture
enabling, so it presents different failure modes for label space
handling. Allow custom DSM command error injection.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 tools/testing/nvdimm/test/nfit.c |   43 ++++++++++++++++++++++----------------
 1 file changed, 25 insertions(+), 18 deletions(-)

diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c
index dc6cf5630280..c8c88363311b 100644
--- a/tools/testing/nvdimm/test/nfit.c
+++ b/tools/testing/nvdimm/test/nfit.c
@@ -1166,12 +1166,12 @@ static int ars_state_init(struct device *dev, struct ars_state *ars_state)
 
 static void put_dimms(void *data)
 {
-	struct device **dimm_dev = data;
+	struct nfit_test *t = data;
 	int i;
 
-	for (i = 0; i < NUM_DCR; i++)
-		if (dimm_dev[i])
-			device_unregister(dimm_dev[i]);
+	for (i = 0; i < t->num_dcr; i++)
+		if (t->dimm_dev[i])
+			device_unregister(t->dimm_dev[i]);
 }
 
 static struct class *nfit_test_dimm;
@@ -1180,13 +1180,11 @@ static int dimm_name_to_id(struct device *dev)
 {
 	int dimm;
 
-	if (sscanf(dev_name(dev), "test_dimm%d", &dimm) != 1
-			|| dimm >= NUM_DCR || dimm < 0)
+	if (sscanf(dev_name(dev), "test_dimm%d", &dimm) != 1)
 		return -ENXIO;
 	return dimm;
 }
 
-
 static ssize_t handle_show(struct device *dev, struct device_attribute *attr,
 		char *buf)
 {
@@ -1259,7 +1257,6 @@ static ssize_t fail_cmd_code_store(struct device *dev, struct device_attribute *
 }
 static DEVICE_ATTR_RW(fail_cmd_code);
 
-
 static struct attribute *nfit_test_dimm_attributes[] = {
 	&dev_attr_fail_cmd.attr,
 	&dev_attr_fail_cmd_code.attr,
@@ -1276,6 +1273,23 @@ static const struct attribute_group *nfit_test_dimm_attribute_groups[] = {
 	NULL,
 };
 
+static int nfit_test_dimm_init(struct nfit_test *t)
+{
+	int i;
+
+	if (devm_add_action_or_reset(&t->pdev.dev, put_dimms, t))
+		return -ENOMEM;
+	for (i = 0; i < t->num_dcr; i++) {
+		t->dimm_dev[i] = device_create_with_groups(nfit_test_dimm,
+				&t->pdev.dev, 0, NULL,
+				nfit_test_dimm_attribute_groups,
+				"test_dimm%d", i + t->dcr_idx);
+		if (!t->dimm_dev[i])
+			return -ENOMEM;
+	}
+	return 0;
+}
+
 static void smart_init(struct nfit_test *t)
 {
 	int i;
@@ -1371,17 +1385,8 @@ static int nfit_test0_alloc(struct nfit_test *t)
 	if (!t->_fit)
 		return -ENOMEM;
 
-	if (devm_add_action_or_reset(&t->pdev.dev, put_dimms, t->dimm_dev))
+	if (nfit_test_dimm_init(t))
 		return -ENOMEM;
-	for (i = 0; i < NUM_DCR; i++) {
-		t->dimm_dev[i] = device_create_with_groups(nfit_test_dimm,
-				&t->pdev.dev, 0, NULL,
-				nfit_test_dimm_attribute_groups,
-				"test_dimm%d", i);
-		if (!t->dimm_dev[i])
-			return -ENOMEM;
-	}
-
 	smart_init(t);
 	return ars_state_init(&t->pdev.dev, &t->ars_state);
 }
@@ -1413,6 +1418,8 @@ static int nfit_test1_alloc(struct nfit_test *t)
 	if (!t->spa_set[1])
 		return -ENOMEM;
 
+	if (nfit_test_dimm_init(t))
+		return -ENOMEM;
 	smart_init(t);
 	return ars_state_init(&t->pdev.dev, &t->ars_state);
 }

[PATCH 4/5] tools/testing/nvdimm: fix missing newline in nfit_test_dimm 'handle' attribute

[Dan Williams]

Sysfs userspace tooling generally expects the kernel to emit a newlines
when reading sysfs attributes.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 tools/testing/nvdimm/test/nfit.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c
index c8c88363311b..51fc41c24a77 100644
--- a/tools/testing/nvdimm/test/nfit.c
+++ b/tools/testing/nvdimm/test/nfit.c
@@ -1193,7 +1193,7 @@ static ssize_t handle_show(struct device *dev, struct device_attribute *attr,
 	if (dimm < 0)
 		return dimm;
 
-	return sprintf(buf, "%#x", handle[dimm]);
+	return sprintf(buf, "%#x\n", handle[dimm]);
 }
 DEVICE_ATTR_RO(handle);
 

[PATCH 5/5] tools/testing/nvdimm: enable labels for nfit_test.1 dimms

[Dan Williams]

Enable test cases for the kernel's fallback to label-less mode.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 tools/testing/nvdimm/test/nfit.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c
index 51fc41c24a77..4ea385be528f 100644
--- a/tools/testing/nvdimm/test/nfit.c
+++ b/tools/testing/nvdimm/test/nfit.c
@@ -2265,6 +2265,9 @@ static void nfit_test1_setup(struct nfit_test *t)
 	set_bit(ND_CMD_ARS_STATUS, &acpi_desc->bus_cmd_force_en);
 	set_bit(ND_CMD_CLEAR_ERROR, &acpi_desc->bus_cmd_force_en);
 	set_bit(ND_INTEL_ENABLE_LSS_STATUS, &acpi_desc->dimm_cmd_force_en);
+	set_bit(ND_CMD_GET_CONFIG_SIZE, &acpi_desc->dimm_cmd_force_en);
+	set_bit(ND_CMD_GET_CONFIG_DATA, &acpi_desc->dimm_cmd_force_en);
+	set_bit(ND_CMD_SET_CONFIG_DATA, &acpi_desc->dimm_cmd_force_en);
 }
 
 static int nfit_test_blk_do_io(struct nd_blk_region *ndbr, resource_size_t dpa,