[v4,09/11] nfit_test: add context to dimm_dev for nfit_test

Commit Message

Dave Jiang July 12, 2018, 8:49 p.m. UTC

In order to access the nfit_test context via sideband sysfs knobs, the
dimm_dev needs to be more than struct device in order to point back to
struct nfit_test. Wrapping the original struct device with a struct
nfit_dimm_dev and saving the nfit_test as private driver data. Also
changing the nfit_mem to be a member of struct nfit_dimm_dev instead of
saving as private driver data of that device. This is in preparation for
adding security DSM support and allowing the locking of DIMMs for testing
via sideband.

Signed-off-by: Dave Jiang <[e-mail]>
---
 tools/testing/nvdimm/test/nfit.c |   41 +++++++++++++++++++++++++-------------
 1 file changed, 27 insertions(+), 14 deletions(-)

Comments

Dan Williams July 13, 2018, 11:54 p.m. UTC | #1

On Thu, Jul 12, 2018 at 1:49 PM, Dave Jiang <[e-mail]> wrote:
> In order to access the nfit_test context via sideband sysfs knobs, the
> dimm_dev needs to be more than struct device in order to point back to
> struct nfit_test. Wrapping the original struct device with a struct
> nfit_dimm_dev and saving the nfit_test as private driver data. Also
> changing the nfit_mem to be a member of struct nfit_dimm_dev instead of
> saving as private driver data of that device. This is in preparation for
> adding security DSM support and allowing the locking of DIMMs for testing
> via sideband.
>
> Signed-off-by: Dave Jiang <[e-mail]>
> ---
>  tools/testing/nvdimm/test/nfit.c |   41 +++++++++++++++++++++++++-------------
>  1 file changed, 27 insertions(+), 14 deletions(-)

Reviewed-by: Dan Williams <[e-mail]>

Patch

diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c
index 18157b0c0d0d..7b3ce2194889 100644
--- a/tools/testing/nvdimm/test/nfit.c
+++ b/tools/testing/nvdimm/test/nfit.c
@@ -150,6 +150,11 @@  struct nfit_test_fw {
 	u64 end_time;
 };
 
+struct nfit_dimm_dev {
+	struct device dev;
+	struct nfit_mem *nfit_mem;
+};
+
 struct nfit_test {
 	struct acpi_nfit_desc acpi_desc;
 	struct platform_device pdev;
@@ -181,7 +186,7 @@  struct nfit_test {
 		unsigned long deadline;
 		spinlock_t lock;
 	} ars_state;
-	struct device *dimm_dev[NUM_DCR];
+	struct nfit_dimm_dev dimm_dev[NUM_DCR];
 	struct nd_intel_smart *smart;
 	struct nd_intel_smart_threshold *smart_threshold;
 	struct badrange badrange;
@@ -981,7 +986,8 @@  static int nfit_test_ctl(struct nvdimm_bus_descriptor *nd_desc,
 						&t->smart_threshold[i -
 							t->dcr_idx],
 						&t->smart[i - t->dcr_idx],
-						&t->pdev.dev, t->dimm_dev[i]);
+						&t->pdev.dev,
+						&t->dimm_dev[i].dev);
 				break;
 			case ND_INTEL_SMART_INJECT:
 				rc = nfit_test_cmd_smart_inject(buf,
@@ -989,7 +995,8 @@  static int nfit_test_ctl(struct nvdimm_bus_descriptor *nd_desc,
 						&t->smart_threshold[i -
 							t->dcr_idx],
 						&t->smart[i - t->dcr_idx],
-						&t->pdev.dev, t->dimm_dev[i]);
+						&t->pdev.dev,
+						&t->dimm_dev[i].dev);
 				break;
 			default:
 				return -ENOTTY;
@@ -1187,8 +1194,7 @@  static void put_dimms(void *data)
 	int i;
 
 	for (i = 0; i < t->num_dcr; i++)
-		if (t->dimm_dev[i])
-			device_unregister(t->dimm_dev[i]);
+		device_unregister(&t->dimm_dev[i].dev);
 }
 
 static struct class *nfit_test_dimm;
@@ -1290,19 +1296,27 @@  static const struct attribute_group *nfit_test_dimm_attribute_groups[] = {
 	NULL,
 };
 
+static void dimm_dev_release(struct device *dev)
+{
+}
+
 static int nfit_test_dimm_init(struct nfit_test *t)
 {
-	int i;
+	int i, rc;
 
 	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;
+		t->dimm_dev[i].dev.parent = &t->pdev.dev;
+		dev_set_name(&t->dimm_dev[i].dev, "test_dimm%d",
+				i + t->dcr_idx);
+		t->dimm_dev[i].dev.class = nfit_test_dimm;
+		t->dimm_dev[i].dev.groups = nfit_test_dimm_attribute_groups;
+		t->dimm_dev[i].dev.release = dimm_dev_release;
+		rc = device_register(&t->dimm_dev[i].dev);
+		if (rc < 0)
+			return rc;
+		dev_set_drvdata(&t->dimm_dev[i].dev, t);
 	}
 	return 0;
 }
@@ -2665,8 +2679,7 @@  static int nfit_test_probe(struct platform_device *pdev)
 
 		for (i = 0; i < NUM_DCR; i++)
 			if (nfit_handle == handle[i])
-				dev_set_drvdata(nfit_test->dimm_dev[i],
-						nfit_mem);
+				nfit_test->dimm_dev[i].nfit_mem = nfit_mem;
 	}
 	mutex_unlock(&acpi_desc->init_mutex);