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Subject[PATCH] rapidio: rework device hierarchy and introduce mport class of devices
Date
This patch removes an artificial RapidIO bus root device and establishes actual
device hierarchy by providing reference to real parent devices.
It also introduces device class for RapidIO controller devices (on-chip or
an eternal bridge, known as "mport").

Existing implementation was sufficient for SoC-based platforms that have
a single RapidIO controller. With introduction of devices using multiple RapidIO
controllers and PCIe-to-RapidIO bridges the old scheme is very limiting or does
not work at all. The implemented changes allow to properly reference platform's
local RapidIO mport devices and provide device details needed for upper layers.

This change to RapidIO device hierarchy does not break any known existing kernel
or user space interfaces.

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com>
Cc: Stef van Os <stef.van.os@prodrive-technologies.com>
Cc: Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>
Cc: Arno Tiemersma <arno.tiemersma@prodrive-technologies.com>
Cc: Rob Landley <rob@landley.net>
Cc: linux-kernel@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
---
Documentation/rapidio/sysfs.txt | 66 +++++++++++++++++++++++++++++++++----
arch/powerpc/sysdev/fsl_rio.c | 1 +
drivers/net/rionet.c | 1 +
drivers/rapidio/devices/tsi721.c | 1 +
drivers/rapidio/rio-driver.c | 22 ++++++++----
drivers/rapidio/rio-scan.c | 1 +
drivers/rapidio/rio-sysfs.c | 40 +++++++++++++++++++++++
drivers/rapidio/rio.c | 11 ++++++
drivers/rapidio/rio.h | 1 +
include/linux/rio.h | 5 ++-
10 files changed, 133 insertions(+), 16 deletions(-)

diff --git a/Documentation/rapidio/sysfs.txt b/Documentation/rapidio/sysfs.txt
index 271438c..47ce9a5 100644
--- a/Documentation/rapidio/sysfs.txt
+++ b/Documentation/rapidio/sysfs.txt
@@ -2,8 +2,8 @@

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

-1. Device Subdirectories
-------------------------
+1. RapidIO Device Subdirectories
+--------------------------------

For each RapidIO device, the RapidIO subsystem creates files in an individual
subdirectory with the following name, /sys/bus/rapidio/devices/<device_name>.
@@ -25,8 +25,8 @@ seen by the enumerating host (destID = 1):
NOTE: An enumerating or discovering endpoint does not create a sysfs entry for
itself, this is why an endpoint with destID=1 is not shown in the list.

-2. Attributes Common for All Devices
-------------------------------------
+2. Attributes Common for All RapidIO Devices
+--------------------------------------------

Each device subdirectory contains the following informational read-only files:

@@ -52,16 +52,16 @@ This attribute is similar in behavior to the "config" attribute of PCI devices
and provides an access to the RapidIO device registers using standard file read
and write operations.

-3. Endpoint Device Attributes
------------------------------
+3. RapidIO Endpoint Device Attributes
+-------------------------------------

Currently Linux RapidIO subsystem does not create any endpoint specific sysfs
attributes. It is possible that RapidIO master port drivers and endpoint device
drivers will add their device-specific sysfs attributes but such attributes are
outside the scope of this document.

-4. Switch Device Attributes
----------------------------
+4. RapidIO Switch Device Attributes
+-----------------------------------

RapidIO switches have additional attributes in sysfs. RapidIO subsystem supports
common and device-specific sysfs attributes for switches. Because switches are
@@ -106,3 +106,53 @@ attribute:
for that controller always will be 0.
To initiate RapidIO enumeration/discovery on all available mports
a user must write '-1' (or RIO_MPORT_ANY) into this attribute file.
+
+
+6. RapidIO Bus Controllers/Ports
+--------------------------------
+
+On-chip RapidIO controllers and PCIe-to-RapidIO bridges (referenced as
+"Master Port" or "mport") are presented in sysfs as the special class of
+devices: "rapidio_port".
+
+The /sys/class/rapidio_port subdirectory contains individual subdirectories
+named as "rapidioN" where N = mport ID registered with RapidIO subsystem.
+
+NOTE: An mport ID is not a RapidIO destination ID assigned to a given local
+mport device.
+
+Each mport device subdirectory in addition to standard entries contains the
+following device-specific attributes:
+
+ port_destid - reports RapidIO destination ID assigned to the given RapidIO
+ mport device. If value 0xFFFFFFFF is returned this means that
+ no valid destination ID have been assigned to the mport (yet).
+ Normally, before enumeration/discovery have been executed only
+ fabric enumerating mports have a valid destination ID assigned
+ to them using "hdid=..." rapidio module parameter.
+ sys_size - reports RapidIO common transport system size:
+ 0 = small (8-bit destination ID, max. 256 devices),
+ 1 = large (16-bit destination ID, max. 65536 devices).
+
+After enumeration or discovery was performed for a given mport device,
+the corresponding subdirectory will also contain subdirectories for each
+child RapidIO device connected to the mport. Naming conventions for RapidIO
+devices are described in Section 1 above.
+
+The example below shows mport device subdirectory with several child RapidIO
+devices attached to it.
+
+[rio@rapidio ~]$ ls /sys/class/rapidio_port/rapidio0/ -l
+total 0
+drwxr-xr-x 3 root root 0 Feb 11 15:10 00:e:0001
+drwxr-xr-x 3 root root 0 Feb 11 15:10 00:e:0004
+drwxr-xr-x 3 root root 0 Feb 11 15:10 00:e:0007
+drwxr-xr-x 3 root root 0 Feb 11 15:10 00:s:0002
+drwxr-xr-x 3 root root 0 Feb 11 15:10 00:s:0003
+drwxr-xr-x 3 root root 0 Feb 11 15:10 00:s:0005
+lrwxrwxrwx 1 root root 0 Feb 11 15:11 device -> ../../../0000:01:00.0
+-r--r--r-- 1 root root 4096 Feb 11 15:11 port_destid
+drwxr-xr-x 2 root root 0 Feb 11 15:11 power
+lrwxrwxrwx 1 root root 0 Feb 11 15:04 subsystem -> ../../../../../../class/rapidio_port
+-r--r--r-- 1 root root 4096 Feb 11 15:11 sys_size
+-rw-r--r-- 1 root root 4096 Feb 11 15:04 uevent
diff --git a/arch/powerpc/sysdev/fsl_rio.c b/arch/powerpc/sysdev/fsl_rio.c
index 95dd892..cf2b084 100644
--- a/arch/powerpc/sysdev/fsl_rio.c
+++ b/arch/powerpc/sysdev/fsl_rio.c
@@ -531,6 +531,7 @@ int fsl_rio_setup(struct platform_device *dev)
sprintf(port->name, "RIO mport %d", i);

priv->dev = &dev->dev;
+ port->dev.parent = &dev->dev;
port->ops = ops;
port->priv = priv;
port->phys_efptr = 0x100;
diff --git a/drivers/net/rionet.c b/drivers/net/rionet.c
index 6d1f6ed..a849718 100644
--- a/drivers/net/rionet.c
+++ b/drivers/net/rionet.c
@@ -493,6 +493,7 @@ static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
ndev->netdev_ops = &rionet_netdev_ops;
ndev->mtu = RIO_MAX_MSG_SIZE - 14;
ndev->features = NETIF_F_LLTX;
+ SET_NETDEV_DEV(ndev, &mport->dev);
SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);

spin_lock_init(&rnet->lock);
diff --git a/drivers/rapidio/devices/tsi721.c b/drivers/rapidio/devices/tsi721.c
index ff7cbf2..1753dc6 100644
--- a/drivers/rapidio/devices/tsi721.c
+++ b/drivers/rapidio/devices/tsi721.c
@@ -2256,6 +2256,7 @@ static int tsi721_setup_mport(struct tsi721_device *priv)
mport->phy_type = RIO_PHY_SERIAL;
mport->priv = (void *)priv;
mport->phys_efptr = 0x100;
+ mport->dev.parent = &pdev->dev;
priv->mport = mport;

INIT_LIST_HEAD(&mport->dbells);
diff --git a/drivers/rapidio/rio-driver.c b/drivers/rapidio/rio-driver.c
index c9ae692..f301f05 100644
--- a/drivers/rapidio/rio-driver.c
+++ b/drivers/rapidio/rio-driver.c
@@ -167,7 +167,6 @@ void rio_unregister_driver(struct rio_driver *rdrv)
void rio_attach_device(struct rio_dev *rdev)
{
rdev->dev.bus = &rio_bus_type;
- rdev->dev.parent = &rio_bus;
}
EXPORT_SYMBOL_GPL(rio_attach_device);

@@ -216,9 +215,12 @@ static int rio_uevent(struct device *dev, struct kobj_uevent_env *env)
return 0;
}

-struct device rio_bus = {
- .init_name = "rapidio",
+struct class rio_mport_class = {
+ .name = "rapidio_port",
+ .owner = THIS_MODULE,
+ .dev_groups = rio_mport_groups,
};
+EXPORT_SYMBOL_GPL(rio_mport_class);

struct bus_type rio_bus_type = {
.name = "rapidio",
@@ -233,14 +235,20 @@ struct bus_type rio_bus_type = {
/**
* rio_bus_init - Register the RapidIO bus with the device model
*
- * Registers the RIO bus device and RIO bus type with the Linux
+ * Registers the RIO mport device class and RIO bus type with the Linux
* device model.
*/
static int __init rio_bus_init(void)
{
- if (device_register(&rio_bus) < 0)
- printk("RIO: failed to register RIO bus device\n");
- return bus_register(&rio_bus_type);
+ int ret;
+
+ ret = class_register(&rio_mport_class);
+ if (!ret) {
+ ret = bus_register(&rio_bus_type);
+ if (ret)
+ class_unregister(&rio_mport_class);
+ }
+ return ret;
}

postcore_initcall(rio_bus_init);
diff --git a/drivers/rapidio/rio-scan.c b/drivers/rapidio/rio-scan.c
index d3a6539..47a1b2e 100644
--- a/drivers/rapidio/rio-scan.c
+++ b/drivers/rapidio/rio-scan.c
@@ -461,6 +461,7 @@ static struct rio_dev *rio_setup_device(struct rio_net *net,
rdev->comp_tag & RIO_CTAG_UDEVID);
}

+ rdev->dev.parent = &port->dev;
rio_attach_device(rdev);

device_initialize(&rdev->dev);
diff --git a/drivers/rapidio/rio-sysfs.c b/drivers/rapidio/rio-sysfs.c
index e0221c6..cdb005c 100644
--- a/drivers/rapidio/rio-sysfs.c
+++ b/drivers/rapidio/rio-sysfs.c
@@ -341,3 +341,43 @@ const struct attribute_group *rio_bus_groups[] = {
&rio_bus_group,
NULL,
};
+
+static ssize_t
+port_destid_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct rio_mport *mport = to_rio_mport(dev);
+
+ if (mport)
+ return sprintf(buf, "0x%04x\n", mport->host_deviceid);
+ else
+ return -ENODEV;
+}
+static DEVICE_ATTR_RO(port_destid);
+
+static ssize_t sys_size_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct rio_mport *mport = to_rio_mport(dev);
+
+ if (mport)
+ return sprintf(buf, "%u\n", mport->sys_size);
+ else
+ return -ENODEV;
+}
+static DEVICE_ATTR_RO(sys_size);
+
+static struct attribute *rio_mport_attrs[] = {
+ &dev_attr_port_destid.attr,
+ &dev_attr_sys_size.attr,
+ NULL,
+};
+
+static const struct attribute_group rio_mport_group = {
+ .attrs = rio_mport_attrs,
+};
+
+const struct attribute_group *rio_mport_groups[] = {
+ &rio_mport_group,
+ NULL,
+};
diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
index 2e8a20c..a54ba04 100644
--- a/drivers/rapidio/rio.c
+++ b/drivers/rapidio/rio.c
@@ -1884,6 +1884,7 @@ static int rio_get_hdid(int index)
int rio_register_mport(struct rio_mport *port)
{
struct rio_scan_node *scan = NULL;
+ int res = 0;

if (next_portid >= RIO_MAX_MPORTS) {
pr_err("RIO: reached specified max number of mports\n");
@@ -1894,6 +1895,16 @@ int rio_register_mport(struct rio_mport *port)
port->host_deviceid = rio_get_hdid(port->id);
port->nscan = NULL;

+ dev_set_name(&port->dev, "rapidio%d", port->id);
+ port->dev.class = &rio_mport_class;
+
+ res = device_register(&port->dev);
+ if (res)
+ dev_err(&port->dev, "RIO: mport%d registration failed ERR=%d\n",
+ port->id, res);
+ else
+ dev_dbg(&port->dev, "RIO: mport%d registered\n", port->id);
+
mutex_lock(&rio_mport_list_lock);
list_add_tail(&port->node, &rio_mports);

diff --git a/drivers/rapidio/rio.h b/drivers/rapidio/rio.h
index 5f99d22..2d0550e 100644
--- a/drivers/rapidio/rio.h
+++ b/drivers/rapidio/rio.h
@@ -50,6 +50,7 @@ extern int rio_mport_scan(int mport_id);
/* Structures internal to the RIO core code */
extern const struct attribute_group *rio_dev_groups[];
extern const struct attribute_group *rio_bus_groups[];
+extern const struct attribute_group *rio_mport_groups[];

#define RIO_GET_DID(size, x) (size ? (x & 0xffff) : ((x & 0x00ff0000) >> 16))
#define RIO_SET_DID(size, x) (size ? (x & 0xffff) : ((x & 0x000000ff) << 16))
diff --git a/include/linux/rio.h b/include/linux/rio.h
index b71d573..6bda06f 100644
--- a/include/linux/rio.h
+++ b/include/linux/rio.h
@@ -83,7 +83,7 @@
#define RIO_CTAG_UDEVID 0x0001ffff /* Unique device identifier */

extern struct bus_type rio_bus_type;
-extern struct device rio_bus;
+extern struct class rio_mport_class;

struct rio_mport;
struct rio_dev;
@@ -201,6 +201,7 @@ struct rio_dev {
#define rio_dev_f(n) list_entry(n, struct rio_dev, net_list)
#define to_rio_dev(n) container_of(n, struct rio_dev, dev)
#define sw_to_rio_dev(n) container_of(n, struct rio_dev, rswitch[0])
+#define to_rio_mport(n) container_of(n, struct rio_mport, dev)

/**
* struct rio_msg - RIO message event
@@ -248,6 +249,7 @@ enum rio_phy_type {
* @phy_type: RapidIO phy type
* @phys_efptr: RIO port extended features pointer
* @name: Port name string
+ * @dev: device structure associated with an mport
* @priv: Master port private data
* @dma: DMA device associated with mport
* @nscan: RapidIO network enumeration/discovery operations
@@ -272,6 +274,7 @@ struct rio_mport {
enum rio_phy_type phy_type; /* RapidIO phy type */
u32 phys_efptr;
unsigned char name[RIO_MAX_MPORT_NAME];
+ struct device dev;
void *priv; /* Master port private data */
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
struct dma_device dma;
--
1.7.8.4


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