>From 1cb4f9b4c57425cc3462b9615ac5bd013f7f4a88 Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@xxxxxxxxx>
Date: Thu, 21 Aug 2014 11:43:26 -0700
Subject: [PATCH 4/5] SES: add reliable slot attribute
The name provided by firmware is in a vendor specific format, publish
the slot number to have a reliable mechanism for identifying slots
across firmware implementations. If the enclosure does not provide a
slot number fallback to the component number which is guaranteed unique,
and usually mirrors the slot number.
Cleaned up the unused ses_component.desc in the process.
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Song Liu <songliubraving@xxxxxx>
Reviewed-by: Jens Axboe <axboe@xxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
---
drivers/misc/enclosure.c | 20 +++++++++++++++++++-
drivers/scsi/ses.c | 17 ++++++++++++-----
include/linux/enclosure.h | 1 +
3 files changed, 32 insertions(+), 6 deletions(-)
diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c
index 18b87de..2e3eafa 100644
--- a/drivers/misc/enclosure.c
+++ b/drivers/misc/enclosure.c
@@ -145,8 +145,10 @@ enclosure_register(struct device *dev, const char *name, int components,
if (err)
goto err;
- for (i = 0; i < components; i++)
+ for (i = 0; i < components; i++) {
edev->component[i].number = -1;
+ edev->component[i].slot = -1;
+ }
mutex_lock(&container_list_lock);
list_add_tail(&edev->node, &container_list);
@@ -552,6 +554,20 @@ static ssize_t get_component_type(struct device *cdev,
return snprintf(buf, 40, "%s\n", enclosure_type[ecomp->type]);
}
+static ssize_t get_component_slot(struct device *cdev,
+ struct device_attribute *attr, char *buf)
+{
+ struct enclosure_component *ecomp = to_enclosure_component(cdev);
+ int slot;
+
+ /* if the enclosure does not override then use 'number' as a stand-in */
+ if (ecomp->slot >= 0)
+ slot = ecomp->slot;
+ else
+ slot = ecomp->number;
+
+ return snprintf(buf, 40, "%d\n", slot);
+}
static DEVICE_ATTR(fault, S_IRUGO | S_IWUSR, get_component_fault,
set_component_fault);
@@ -562,6 +578,7 @@ static DEVICE_ATTR(active, S_IRUGO | S_IWUSR, get_component_active,
static DEVICE_ATTR(locate, S_IRUGO | S_IWUSR, get_component_locate,
set_component_locate);
static DEVICE_ATTR(type, S_IRUGO, get_component_type, NULL);
+static DEVICE_ATTR(slot, S_IRUGO, get_component_slot, NULL);
static struct attribute *enclosure_component_attrs[] = {
&dev_attr_fault.attr,
@@ -569,6 +586,7 @@ static struct attribute *enclosure_component_attrs[] = {
&dev_attr_active.attr,
&dev_attr_locate.attr,
&dev_attr_type.attr,
+ &dev_attr_slot.attr,
NULL
};
ATTRIBUTE_GROUPS(enclosure_component);
diff --git a/drivers/scsi/ses.c b/drivers/scsi/ses.c
index 696d5d8..3e59a5d 100644
--- a/drivers/scsi/ses.c
+++ b/drivers/scsi/ses.c
@@ -47,7 +47,6 @@ struct ses_device {
struct ses_component {
u64 addr;
- unsigned char *desc;
};
static int ses_probe(struct device *dev)
@@ -307,19 +306,26 @@ static void ses_process_descriptor(struct enclosure_component *ecomp,
int invalid = desc[0] & 0x80;
enum scsi_protocol proto = desc[0] & 0x0f;
u64 addr = 0;
+ int slot = -1;
struct ses_component *scomp = ecomp->scratch;
unsigned char *d;
- scomp->desc = desc;
-
if (invalid)
return;
switch (proto) {
+ case SCSI_PROTOCOL_FCP:
+ if (eip) {
+ d = desc + 4;
+ slot = d[3];
+ }
+ break;
case SCSI_PROTOCOL_SAS:
- if (eip)
+ if (eip) {
+ d = desc + 4;
+ slot = d[3];
d = desc + 8;
- else
+ } else
d = desc + 4;
/* only take the phy0 addr */
addr = (u64)d[12] << 56 |
@@ -335,6 +341,7 @@ static void ses_process_descriptor(struct enclosure_component *ecomp,
/* FIXME: Need to add more protocols than just SAS */
break;
}
+ ecomp->slot = slot;
scomp->addr = addr;
}
diff --git a/include/linux/enclosure.h b/include/linux/enclosure.h
index 807622b..0f826c1 100644
--- a/include/linux/enclosure.h
+++ b/include/linux/enclosure.h
@@ -92,6 +92,7 @@ struct enclosure_component {
int fault;
int active;
int locate;
+ int slot;
enum enclosure_status status;
};
--
1.8.1
--
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