diff mbox series

[V2,16/16] crypto/nx: Add sysfs interface to export NX capabilities

Message ID 7f37374884abdab3e6079b1cc0ad0736c0db97ae.camel@linux.ibm.com (mailing list archive)
State Superseded
Headers show
Series Enable VAS and NX-GZIP support on powerVM | expand
Related show

Checks

Context Check Description
snowpatch_ozlabs/apply_patch warning Failed to apply on branch powerpc/merge (d02429becbe77bc4d27a7357afaf28f9294945bb)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch powerpc/next (c46bbf5d2defae50d61ddf31502017ee8952af83)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch linus/master (89698becf06d341a700913c3d89ce2a914af69a2)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch powerpc/fixes (791f9e36599d94af5a76d3f74d04e16326761aae)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch linux-next (d4961772226de3b48a395a26c076d450d7044c76)
snowpatch_ozlabs/apply_patch fail Failed to apply to any branch

Commit Message

Haren Myneni April 13, 2021, 8:30 a.m. UTC 
Changes to export the following NXGZIP capabilities through sysfs:

/sys/devices/vio/ibm,compression-v1/NxGzCaps:
min_compress_len  /*Recommended minimum compress length in bytes*/
min_decompress_len /*Recommended minimum decompress length in bytes*/
req_max_processed_len /* Maximum number of bytes processed in one
			request */

Signed-off-by: Haren Myneni <haren@linux.ibm.com>
---
 drivers/crypto/nx/nx-common-pseries.c | 43 +++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
diff mbox series

Patch

diff --git a/drivers/crypto/nx/nx-common-pseries.c b/drivers/crypto/nx/nx-common-pseries.c
index 49224870d05e..cc258d2c6475 100644
--- a/drivers/crypto/nx/nx-common-pseries.c
+++ b/drivers/crypto/nx/nx-common-pseries.c
@@ -962,6 +962,36 @@  static struct attribute_group nx842_attribute_group = {
 	.attrs = nx842_sysfs_entries,
 };
 
+#define	nxct_capab_read(_name)						\
+static ssize_t nxct_##_name##_show(struct device *dev,			\
+			struct device_attribute *attr, char *buf)	\
+{									\
+	return sprintf(buf, "%lld\n", nx_ct_capab._name);		\
+}
+
+#define NXCT_ATTR_RO(_name)						\
+	nxct_capab_read(_name);						\
+	static struct device_attribute dev_attr_##_name = __ATTR(_name,	\
+						0444,			\
+						nxct_##_name##_show,	\
+						NULL);
+
+NXCT_ATTR_RO(req_max_processed_len);
+NXCT_ATTR_RO(min_compress_len);
+NXCT_ATTR_RO(min_decompress_len);
+
+static struct attribute *nxct_capab_sysfs_entries[] = {
+	&dev_attr_req_max_processed_len.attr,
+	&dev_attr_min_compress_len.attr,
+	&dev_attr_min_decompress_len.attr,
+	NULL,
+};
+
+static struct attribute_group nxct_capab_attr_group = {
+	.name	=	nx_ct_capab.name,
+	.attrs	=	nxct_capab_sysfs_entries,
+};
+
 static struct nx842_driver nx842_pseries_driver = {
 	.name =		KBUILD_MODNAME,
 	.owner =	THIS_MODULE,
@@ -1051,6 +1081,16 @@  static int nx842_probe(struct vio_dev *viodev,
 		goto error;
 	}
 
+	if (capab_feat) {
+		if (sysfs_create_group(&viodev->dev.kobj,
+					&nxct_capab_attr_group)) {
+			dev_err(&viodev->dev,
+				"Could not create sysfs NX capability entries\n");
+			ret = -1;
+			goto error;
+		}
+	}
+
 	return 0;
 
 error_unlock:
@@ -1070,6 +1110,9 @@  static void nx842_remove(struct vio_dev *viodev)
 	pr_info("Removing IBM Power 842 compression device\n");
 	sysfs_remove_group(&viodev->dev.kobj, &nx842_attribute_group);
 
+	if (capab_feat)
+		sysfs_remove_group(&viodev->dev.kobj, &nxct_capab_attr_group);
+
 	crypto_unregister_alg(&nx842_pseries_alg);
 
 	spin_lock_irqsave(&devdata_mutex, flags);