On Wed, Jan 10, 2007 at 04:59:39PM -0600, linas wrote:
>
> > However, on a Power4 architecture there are errors reported
> > in upper layer (we discussed this in one of earlier emails) followed
> > by SCSI errors.
>
> I'm trying to investigate now.
I found two distinct power4 bugs. I posted a patch for one yesterday,
under the subject heading
[PATCH] Urgent: powerpc 2.6.20-rc4 dma broken on non-LPAR pseries
This affects only recent mainline kernels; it would not affect
older or distro kernels.
The other patch is attached below. After some more testing,
I'll submit to mainline.
--linas
Subject: [PATCH] pSeries: EEH improperly enabled for some Power4 systems
It appears that EEH is improperly enabled for some Power4 systems.
On these systems, the ibm,set-eeh-option returns a value of success
even when EEH is not supported on the given node. Thus, an explicit
check for support is required.
Signed-off-by: Linas Vepstas <[EMAIL PROTECTED]>
----
arch/powerpc/platforms/pseries/eeh.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
Index: linux-2.6.20-rc4/arch/powerpc/platforms/pseries/eeh.c
===================================================================
--- linux-2.6.20-rc4.orig/arch/powerpc/platforms/pseries/eeh.c 2007-01-11
14:15:02.000000000 -0600
+++ linux-2.6.20-rc4/arch/powerpc/platforms/pseries/eeh.c 2007-01-11
15:14:39.000000000 -0600
@@ -748,6 +748,7 @@ struct eeh_early_enable_info {
/* Enable eeh for the given device node. */
static void *early_enable_eeh(struct device_node *dn, void *data)
{
+ unsigned int rets[3];
struct eeh_early_enable_info *info = data;
int ret;
const char *status = get_property(dn, "status", NULL);
@@ -804,16 +805,14 @@ static void *early_enable_eeh(struct dev
regs[0], info->buid_hi, info->buid_lo,
EEH_ENABLE);
+ enable = 0;
if (ret == 0) {
- eeh_subsystem_enabled = 1;
- pdn->eeh_mode |= EEH_MODE_SUPPORTED;
pdn->eeh_config_addr = regs[0];
/* If the newer, better, ibm,get-config-addr-info is
supported,
* then use that instead. */
pdn->eeh_pe_config_addr = 0;
if (ibm_get_config_addr_info != RTAS_UNKNOWN_SERVICE) {
- unsigned int rets[2];
ret = rtas_call (ibm_get_config_addr_info, 4,
2, rets,
pdn->eeh_config_addr,
info->buid_hi, info->buid_lo,
@@ -821,6 +820,20 @@ static void *early_enable_eeh(struct dev
if (ret == 0)
pdn->eeh_pe_config_addr = rets[0];
}
+
+ /* Some older systems (Power4) allow the
+ * ibm,set-eeh-option call to succeed even on nodes
+ * where EEH is not supported. Verify support
+ * explicitly. */
+ ret = read_slot_reset_state(pdn, rets);
+ if ((ret == 0) && (rets[1] == 1))
+ enable = 1;
+ }
+
+ if (enable) {
+ eeh_subsystem_enabled = 1;
+ pdn->eeh_mode |= EEH_MODE_SUPPORTED;
+
#ifdef DEBUG
printk(KERN_DEBUG "EEH: %s: eeh enabled, config=%x
pe_config=%x\n",
dn->full_name, pdn->eeh_config_addr,
pdn->eeh_pe_config_addr);
-
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