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rapidio: add handling of redundant routes 

Detects RIO link to the already enumerated device and properly sets links
between device objects.  Changes to the enumeration/discovery logic:

1. Use Master Enable bit to signal end of the enumeration - agents may
   start their discovery process as soon as they see this bit set
   (Component Tag register was used before for this purpose).

2. Enumerator sets Component Tag (!= 0) immediately during device
   setup.  This allows to identify the device if the redundant route
   exists in a RIO system.

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Thomas Moll <thomas.moll@sysgo.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
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>
This commit is contained in:
Alexandre Bounine 2010-10-27 15:34:34 -07:00 committed by Linus Torvalds
parent a3725c45c1
commit af84ca38af
5 changed files with 64 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/powerpc/sysdev/fsl_rio.c
View File

@ -50,6 +50,7 @@
#define RIO_ATMU_REGS_OFFSET 0x10c00
#define RIO_P_MSG_REGS_OFFSET 0x11000
#define RIO_S_MSG_REGS_OFFSET 0x13000
#define RIO_GCCSR 0x13c
#define RIO_ESCSR 0x158
#define RIO_CCSR 0x15c
#define RIO_LTLEDCSR 0x0608
@ -1471,6 +1472,7 @@ int fsl_rio_setup(struct platform_device *dev)
port->host_deviceid = fsl_rio_get_hdid(port->id);
port->priv = priv;
port->phys_efptr = 0x100;
rio_register_mport(port);
priv->regs_win = ioremap(regs.start, regs.end - regs.start + 1);
@ -1518,6 +1520,12 @@ int fsl_rio_setup(struct platform_device *dev)
dev_info(&dev->dev, "RapidIO Common Transport System size: %d\n",
port->sys_size ? 65536 : 256);
if (port->host_deviceid >= 0)
out_be32(priv->regs_win + RIO_GCCSR, RIO_PORT_GEN_HOST |
RIO_PORT_GEN_MASTER | RIO_PORT_GEN_DISCOVERED);
else
out_be32(priv->regs_win + RIO_GCCSR, 0x00000000);
priv->atmu_regs = (struct rio_atmu_regs *)(priv->regs_win
+ RIO_ATMU_REGS_OFFSET);
priv->maint_atmu_regs = priv->atmu_regs + 1;

88
drivers/rapidio/rio-scan.c
View File

@ -48,7 +48,7 @@ DEFINE_SPINLOCK(rio_global_list_lock);
static int next_destid = 0;
static int next_switchid = 0;
static int next_net = 0;
static int next_comptag;
static int next_comptag = 1;
static struct timer_list rio_enum_timer =
TIMER_INITIALIZER(rio_enum_timeout, 0, 0);
@ -121,27 +121,6 @@ static int rio_clear_locks(struct rio_mport *port)
u32 result;
int ret = 0;
/* Assign component tag to all devices */
next_comptag = 1;
rio_local_write_config_32(port, RIO_COMPONENT_TAG_CSR, next_comptag++);
list_for_each_entry(rdev, &rio_devices, global_list) {
/* Mark device as discovered */
rio_read_config_32(rdev,
rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
&result);
rio_write_config_32(rdev,
rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
result | RIO_PORT_GEN_DISCOVERED);
rio_write_config_32(rdev, RIO_COMPONENT_TAG_CSR, next_comptag);
rdev->comp_tag = next_comptag++;
if (next_comptag >= 0x10000) {
pr_err("RIO: Component Tag Counter Overflow\n");
break;
}
}
/* Release host device id locks */
rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
port->host_deviceid);
@ -162,6 +141,15 @@ static int rio_clear_locks(struct rio_mport *port)
rdev->vid, rdev->did);
ret = -EINVAL;
}
/* Mark device as discovered and enable master */
rio_read_config_32(rdev,
rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
&result);
result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
rio_write_config_32(rdev,
rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
result);
}
return ret;
@ -430,6 +418,17 @@ static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
&rdev->dst_ops);
if (do_enum) {
/* Assign component tag to device */
if (next_comptag >= 0x10000) {
pr_err("RIO: Component Tag Counter Overflow\n");
goto cleanup;
}
rio_mport_write_config_32(port, destid, hopcount,
RIO_COMPONENT_TAG_CSR, next_comptag);
rdev->comp_tag = next_comptag++;
}
if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
if (do_enum) {
rio_set_device_id(port, destid, hopcount, next_destid);
@ -725,21 +724,6 @@ static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
return (u16) (result & 0xffff);
}
/**
* rio_net_add_mport- Add a master port to a RIO network
* @net: RIO network
* @port: Master port to add
*
* Adds a master port to the network list of associated master
* ports..
*/
static void rio_net_add_mport(struct rio_net *net, struct rio_mport *port)
{
spin_lock(&rio_global_list_lock);
list_add_tail(&port->nnode, &net->mports);
spin_unlock(&rio_global_list_lock);
}
/**
* rio_enum_peer- Recursively enumerate a RIO network through a master port
* @net: RIO network being enumerated
@ -760,6 +744,7 @@ static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
int sw_inport;
struct rio_dev *rdev;
u16 destid;
u32 regval;
int tmp;
if (rio_mport_chk_dev_access(port,
@ -772,9 +757,21 @@ static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
pr_debug("RIO: PE already discovered by this host\n");
/*
* Already discovered by this host. Add it as another
* master port for the current network.
* link to the existing device.
*/
rio_net_add_mport(net, port);
rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
hopcount, RIO_COMPONENT_TAG_CSR, &regval);
if (regval) {
rdev = rio_get_comptag((regval & 0xffff), NULL);
if (rdev && prev && rio_is_switch(prev)) {
pr_debug("RIO: redundant path to %s\n",
rio_name(rdev));
prev->rswitch->nextdev[prev_port] = rdev;
}
}
return 0;
}
@ -925,10 +922,11 @@ static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
*/
static int rio_enum_complete(struct rio_mport *port)
{
u32 tag_csr;
u32 regval;
rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr);
return (tag_csr & 0xffff) ? 1 : 0;
rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
&regval);
return (regval & RIO_PORT_GEN_MASTER) ? 1 : 0;
}
/**
@ -991,6 +989,8 @@ rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
break;
}
if (ndestid == RIO_ANY_DESTID(port->sys_size))
continue;
rio_unlock_device(port, destid, hopcount);
if (rio_disc_peer
(net, port, ndestid, hopcount + 1) < 0)
@ -1163,6 +1163,10 @@ int __devinit rio_enum_mport(struct rio_mport *mport)
/* Enable Input Output Port (transmitter reviever) */
rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
/* Set component tag for host */
rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
next_comptag++);
if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
/* A higher priority host won enumeration, bail. */
printk(KERN_INFO

16
drivers/rapidio/rio.c
View File

@ -443,7 +443,7 @@ rio_mport_get_physefb(struct rio_mport *port, int local,
* @from is not %NULL, searches continue from next device on the global
* list.
*/
static struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)
struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)
{
struct list_head *n;
struct rio_dev *rdev;
@ -507,7 +507,7 @@ static int
rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)
{
u32 result;
int p_port, rc = -EIO;
int p_port, dstid, rc = -EIO;
struct rio_dev *prev = NULL;
/* Find switch with failed RIO link */
@ -522,20 +522,18 @@ rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)
if (prev == NULL)
goto err_out;
/* Find port with failed RIO link */
for (p_port = 0;
p_port < RIO_GET_TOTAL_PORTS(prev->swpinfo); p_port++)
if (prev->rswitch->nextdev[p_port] == rdev)
break;
dstid = (rdev->pef & RIO_PEF_SWITCH) ?
rdev->rswitch->destid : rdev->destid;
p_port = prev->rswitch->route_table[dstid];
if (p_port < RIO_GET_TOTAL_PORTS(prev->swpinfo)) {
if (p_port != RIO_INVALID_ROUTE) {
pr_debug("RIO: link failed on [%s]-P%d\n",
rio_name(prev), p_port);
*nrdev = prev;
*npnum = p_port;
rc = 0;
} else
pr_debug("RIO: failed to trace route to %s\n", rio_name(prev));
pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev));
err_out:
return rc;
}

1
drivers/rapidio/rio.h
View File

@ -38,6 +38,7 @@ extern int rio_std_route_get_entry(struct rio_mport *mport, u16 destid,
extern int rio_std_route_clr_table(struct rio_mport *mport, u16 destid,
u8 hopcount, u16 table);
extern int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock);
extern struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from);
/* Structures internal to the RIO core code */
extern struct device_attribute rio_dev_attrs[];

2
include/linux/rio.h
View File

@ -177,6 +177,7 @@ enum rio_phy_type {
* @index: Port index, unique among all port interfaces of the same type
* @sys_size: RapidIO common transport system size
* @phy_type: RapidIO phy type
* @phys_efptr: RIO port extended features pointer
* @name: Port name string
* @priv: Master port private data
*/
@ -198,6 +199,7 @@ struct rio_mport {
* 1 - Large size, 65536 devices.
*/
enum rio_phy_type phy_type; /* RapidIO phy type */
u32 phys_efptr;
unsigned char name[40];
void *priv; /* Master port private data */
};