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rapidio: add handling of redundant routes

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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
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16
drivers/rapidio/rio.c
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@ -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;
}