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@idt.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Thomas Moll <thomas.moll@sysgo.com>
Cc: Micha Nelissen <micha@neli.hopto.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 40 insertions, 1 deletions

diff --git a/drivers/rapidio/rio-sysfs.c b/drivers/rapidio/rio-sysfs.c
index 1269fbd2deca..0d894320e227 100644
--- a/drivers/rapidio/rio-sysfs.c
+++ b/drivers/rapidio/rio-sysfs.c
@@ -33,6 +33,8 @@ 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)
 {
@@ -52,6 +54,35 @@ 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),
@@ -59,10 +90,14 @@ 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,
@@ -218,7 +253,9 @@ 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);
         }
@@ -241,6 +278,8 @@ 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);
         }