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Subject[PATCH 2/5] rapidio: use device lists handling on per-net basis
Date
Modify handling of device lists to resolve issues caused by using single global
list of RIO devices during enumeration/discovery. The most common sign of
existing issue is incorrect contents of switch routing tables in systems with
multiple mport controllers while single-port configuration performs as expected.

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
---
drivers/rapidio/rio-scan.c | 60 ++++++++++++++++++++++---------------------
include/linux/rio.h | 1 +
2 files changed, 32 insertions(+), 29 deletions(-)

diff --git a/drivers/rapidio/rio-scan.c b/drivers/rapidio/rio-scan.c
index 0a27253..8b7c4bc 100644
--- a/drivers/rapidio/rio-scan.c
+++ b/drivers/rapidio/rio-scan.c
@@ -38,7 +38,6 @@
#include "rio.h"

LIST_HEAD(rio_devices);
-static LIST_HEAD(rio_switches);

static void rio_init_em(struct rio_dev *rdev);

@@ -104,14 +103,15 @@ static void rio_local_set_device_id(struct rio_mport *port, u16 did)

/**
* rio_clear_locks- Release all host locks and signal enumeration complete
- * @port: Master port to issue transaction
+ * @net: RIO network to run on
*
* Marks the component tag CSR on each device with the enumeration
* complete flag. When complete, it then release the host locks on
* each device. Returns 0 on success or %-EINVAL on failure.
*/
-static int rio_clear_locks(struct rio_mport *port)
+static int rio_clear_locks(struct rio_net *net)
{
+ struct rio_mport *port = net->hport;
struct rio_dev *rdev;
u32 result;
int ret = 0;
@@ -126,7 +126,7 @@ static int rio_clear_locks(struct rio_mport *port)
result);
ret = -EINVAL;
}
- list_for_each_entry(rdev, &rio_devices, global_list) {
+ list_for_each_entry(rdev, &net->devices, net_list) {
rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
port->host_deviceid);
rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
@@ -479,7 +479,7 @@ static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
rswitch->clr_table(port, destid, hopcount,
RIO_GLOBAL_TABLE);

- list_add_tail(&rswitch->node, &rio_switches);
+ list_add_tail(&rswitch->node, &net->switches);

} else {
if (do_enum)
@@ -1058,6 +1058,7 @@ static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
if (net) {
INIT_LIST_HEAD(&net->node);
INIT_LIST_HEAD(&net->devices);
+ INIT_LIST_HEAD(&net->switches);
INIT_LIST_HEAD(&net->mports);
list_add_tail(&port->nnode, &net->mports);
net->hport = port;
@@ -1068,24 +1069,24 @@ static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)

/**
* rio_update_route_tables- Updates route tables in switches
- * @port: Master port associated with the RIO network
+ * @net: RIO network to run update on
*
* For each enumerated device, ensure that each switch in a system
* has correct routing entries. Add routes for devices that where
* unknown dirung the first enumeration pass through the switch.
*/
-static void rio_update_route_tables(struct rio_mport *port)
+static void rio_update_route_tables(struct rio_net *net)
{
struct rio_dev *rdev, *swrdev;
struct rio_switch *rswitch;
u8 sport;
u16 destid;

- list_for_each_entry(rdev, &rio_devices, global_list) {
+ list_for_each_entry(rdev, &net->devices, net_list) {

destid = rdev->destid;

- list_for_each_entry(rswitch, &rio_switches, node) {
+ list_for_each_entry(rswitch, &net->switches, node) {

if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
continue;
@@ -1181,12 +1182,12 @@ int __devinit rio_enum_mport(struct rio_mport *mport)
printk(KERN_INFO
"RIO: master port %d device has lost enumeration to a remote host\n",
mport->id);
- rio_clear_locks(mport);
+ rio_clear_locks(net);
rc = -EBUSY;
goto out;
}
- rio_update_route_tables(mport);
- rio_clear_locks(mport);
+ rio_update_route_tables(net);
+ rio_clear_locks(net);
rio_pw_enable(mport, 1);
} else {
printk(KERN_INFO "RIO: master port %d link inactive\n",
@@ -1200,33 +1201,34 @@ int __devinit rio_enum_mport(struct rio_mport *mport)

/**
* rio_build_route_tables- Generate route tables from switch route entries
+ * @net: RIO network to run route tables scan on
*
* For each switch device, generate a route table by copying existing
* route entries from the switch.
*/
-static void rio_build_route_tables(void)
+static void rio_build_route_tables(struct rio_net *net)
{
+ struct rio_switch *rswitch;
struct rio_dev *rdev;
int i;
u8 sport;

- list_for_each_entry(rdev, &rio_devices, global_list)
- if (rio_is_switch(rdev)) {
- rio_lock_device(rdev->net->hport, rdev->destid,
- rdev->hopcount, 1000);
- for (i = 0;
- i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
- i++) {
- if (rio_route_get_entry(rdev,
- RIO_GLOBAL_TABLE, i, &sport, 0) < 0)
- continue;
- rdev->rswitch->route_table[i] = sport;
- }
+ list_for_each_entry(rswitch, &net->switches, node) {
+ rdev = sw_to_rio_dev(rswitch);

- rio_unlock_device(rdev->net->hport,
- rdev->destid,
- rdev->hopcount);
+ rio_lock_device(net->hport, rdev->destid,
+ rdev->hopcount, 1000);
+ for (i = 0;
+ i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
+ i++) {
+ if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
+ i, &sport, 0) < 0)
+ continue;
+ rswitch->route_table[i] = sport;
}
+
+ rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
+ }
}

/**
@@ -1284,7 +1286,7 @@ enum_done:
goto bail;
}

- rio_build_route_tables();
+ rio_build_route_tables(net);
}

return 0;
diff --git a/include/linux/rio.h b/include/linux/rio.h
index 4d1a104..7ea02c4 100644
--- a/include/linux/rio.h
+++ b/include/linux/rio.h
@@ -275,6 +275,7 @@ struct rio_mport {
struct rio_net {
struct list_head node; /* node in list of networks */
struct list_head devices; /* list of devices in this net */
+ struct list_head switches; /* list of switches in this net */
struct list_head mports; /* list of ports accessing net */
struct rio_mport *hport; /* primary port for accessing net */
unsigned char id; /* RIO network ID */
--
1.7.8.4


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