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Date: Fri, 25 Feb 2011 13:26:24 -0500
From: Alexandre Bounine <alexandre.bounine@....com>
To: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org
Cc: Alexandre Bounine <alexandre.bounine@....com>,
Kumar Gala <galak@...nel.crashing.org>,
Matt Porter <mporter@...nel.crashing.org>,
Li Yang <leoli@...escale.com>,
Thomas Moll <thomas.moll@...go.com>,
Micha Nelissen <micha@...i.hopto.org>
Subject: [PATCH -mm V2] rapidio: Add new sysfs attributes
Add new sysfs attributes.
1. Routing information required to to reach the RIO device:
destid - device destination ID (real for for endpoint, route for switch)
hopcount - hopcount for maintenance requests (switches only)
2. device linking information:
lprev - name of device that precedes the given device in the enumeration
or discovery order (displayed along with of the port to which it
is attached).
lnext - names of devices (with corresponding port numbers) that are
attached to the given device as next in the enumeration or
discovery order (switches only)
Signed-off-by: Alexandre Bounine <alexandre.bounine@....com>
Cc: Kumar Gala <galak@...nel.crashing.org>
Cc: Matt Porter <mporter@...nel.crashing.org>
Cc: Li Yang <leoli@...escale.com>
Cc: Thomas Moll <thomas.moll@...go.com>
Cc: Micha Nelissen <micha@...i.hopto.org>
---
Documentation/rapidio/sysfs.txt | 17 +++++++++++++--
drivers/rapidio/rio-sysfs.c | 41 ++++++++++++++++++++++++++++++++++++++-
2 files changed, 54 insertions(+), 4 deletions(-)
diff --git a/Documentation/rapidio/sysfs.txt b/Documentation/rapidio/sysfs.txt
index d6d986e..97f71ce 100755
--- a/Documentation/rapidio/sysfs.txt
+++ b/Documentation/rapidio/sysfs.txt
@@ -36,6 +36,10 @@ device_rev - returns the device revision level
asm_did - returns identifier for the assembly containing the device
asm_rev - returns revision level of the assembly containing the device
asm_vid - returns vendor identifier of the assembly containing the device
+ destid - returns device destination ID assigned by the enumeration routine
+ (see 4.1 for switch specific details)
+ lprev - returns name of previous device (switch) on the path to the device
+ that that owns this attribute
In addition to the files listed above, each device has a binary attribute file
that allows read/write access to the device configuration registers using
@@ -66,9 +70,16 @@ set by the switch initialization routine during enumeration or discovery process
4.1 Common Switch Attributes
- routes - reports switch routing information in "destID port" format. This
- attribute reports only valid routing table entries, one line for
- each entry.
+ routes - reports switch routing information in "destID port" format. This
+ attribute reports only valid routing table entries, one line for
+ each entry.
+ destid - device destination ID that defines a route to the switch
+ hopcount - number of hops on the path to the switch
+ lnext - returns names of devices linked to the switch except one of a device
+ linked to the ingress port (reported as "lprev"). This is an array
+ names with number of lines equal to number of ports in switch. If
+ a switch port has no attached device, returns "null" instead of
+ a device name.
4.2 Device-specific Switch Attributes
diff --git a/drivers/rapidio/rio-sysfs.c b/drivers/rapidio/rio-sysfs.c
index c04dbc7..4dbe360 100644
--- a/drivers/rapidio/rio-sysfs.c
+++ b/drivers/rapidio/rio-sysfs.c
@@ -34,6 +34,8 @@ rio_config_attr(device_rev, "0x%08x\n");
rio_config_attr(asm_did, "0x%04x\n");
rio_config_attr(asm_vid, "0x%04x\n");
rio_config_attr(asm_rev, "0x%04x\n");
+rio_config_attr(destid, "0x%04x\n");
+rio_config_attr(hopcount, "0x%02x\n");
static ssize_t routes_show(struct device *dev, struct device_attribute *attr, char *buf)
{
@@ -53,6 +55,35 @@ static ssize_t routes_show(struct device *dev, struct device_attribute *attr, ch
return (str - buf);
}
+static ssize_t lprev_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct rio_dev *rdev = to_rio_dev(dev);
+
+ return sprintf(buf, "%s\n",
+ (rdev->prev) ? rio_name(rdev->prev) : "root");
+}
+
+static ssize_t lnext_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct rio_dev *rdev = to_rio_dev(dev);
+ char *str = buf;
+ int i;
+
+ if (rdev->pef & RIO_PEF_SWITCH) {
+ for (i = 0; i < RIO_GET_TOTAL_PORTS(rdev->swpinfo); i++) {
+ if (rdev->rswitch->nextdev[i])
+ str += sprintf(str, "%s\n",
+ rio_name(rdev->rswitch->nextdev[i]));
+ else
+ str += sprintf(str, "null\n");
+ }
+ }
+
+ return str - buf;
+}
+
struct device_attribute rio_dev_attrs[] = {
__ATTR_RO(did),
__ATTR_RO(vid),
@@ -60,10 +91,14 @@ struct device_attribute rio_dev_attrs[] = {
__ATTR_RO(asm_did),
__ATTR_RO(asm_vid),
__ATTR_RO(asm_rev),
+ __ATTR_RO(lprev),
+ __ATTR_RO(destid),
__ATTR_NULL,
};
static DEVICE_ATTR(routes, S_IRUGO, routes_show, NULL);
+static DEVICE_ATTR(lnext, S_IRUGO, lnext_show, NULL);
+static DEVICE_ATTR(hopcount, S_IRUGO, hopcount_show, NULL);
static ssize_t
rio_read_config(struct file *filp, struct kobject *kobj,
@@ -219,7 +254,9 @@ int rio_create_sysfs_dev_files(struct rio_dev *rdev)
err = device_create_bin_file(&rdev->dev, &rio_config_attr);
if (!err && (rdev->pef & RIO_PEF_SWITCH)) {
- err = device_create_file(&rdev->dev, &dev_attr_routes);
+ err |= device_create_file(&rdev->dev, &dev_attr_routes);
+ err |= device_create_file(&rdev->dev, &dev_attr_lnext);
+ err |= device_create_file(&rdev->dev, &dev_attr_hopcount);
if (!err && rdev->rswitch->sw_sysfs)
err = rdev->rswitch->sw_sysfs(rdev, RIO_SW_SYSFS_CREATE);
}
@@ -242,6 +279,8 @@ void rio_remove_sysfs_dev_files(struct rio_dev *rdev)
device_remove_bin_file(&rdev->dev, &rio_config_attr);
if (rdev->pef & RIO_PEF_SWITCH) {
device_remove_file(&rdev->dev, &dev_attr_routes);
+ device_remove_file(&rdev->dev, &dev_attr_lnext);
+ device_remove_file(&rdev->dev, &dev_attr_hopcount);
if (rdev->rswitch->sw_sysfs)
rdev->rswitch->sw_sysfs(rdev, RIO_SW_SYSFS_REMOVE);
}
--
1.7.3.1
--
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