powerpc/eeh: Don't check RTAS token to get PE addr

RTAS token "ibm,get-config-addr-info" or ibm,get-config-addr-info2"
are used to retrieve the PE address according to PCI address, which
made up of domain/bus/slot/function. If we don't have those 2 tokens,
the domain/bus/slot/function would be used as the address for EEH
RTAS operations. Some older f/w might not have those 2 tokens and
that blocks the EEH functionality to be initialized. It was introduced
by commit e2af155c ("powerpc/eeh: pseries platform EEH initialization").

The patch skips the check on those 2 tokens so we can bring up EEH
functionality successfully. And domain/bus/slot/function will be
used as address for EEH RTAS operations.

Cc: <stable@vger.kernel.org> # v3.4+
Reported-by: Robert Knight <knight@princeton.edu>
Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Tested-by: Robert Knight <knight@princeton.edu>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/platforms/pseries/eeh_pseries.c b/arch/powerpc/platforms/pseries/eeh_pseries.c
index 19506f9..b456b15 100644 (file)
--- a/arch/powerpc/platforms/pseries/eeh_pseries.c
+++ b/arch/powerpc/platforms/pseries/eeh_pseries.c
@@ -83,7 +83,11 @@ static int pseries_eeh_init(void)
        ibm_configure_pe                = rtas_token("ibm,configure-pe");
        ibm_configure_bridge            = rtas_token("ibm,configure-bridge");
 
-       /* necessary sanity check */
+       /*
+        * Necessary sanity check. We needn't check "get-config-addr-info"
+        * and its variant since the old firmware probably support address
+        * of domain/bus/slot/function for EEH RTAS operations.
+        */
        if (ibm_set_eeh_option == RTAS_UNKNOWN_SERVICE) {
                pr_warning("%s: RTAS service <ibm,set-eeh-option> invalid\n",
                        __func__);
@@ -102,12 +106,6 @@ static int pseries_eeh_init(void)
                pr_warning("%s: RTAS service <ibm,slot-error-detail> invalid\n",
                        __func__);
                return -EINVAL;
-       } else if (ibm_get_config_addr_info2 == RTAS_UNKNOWN_SERVICE &&
-                  ibm_get_config_addr_info == RTAS_UNKNOWN_SERVICE) {
-               pr_warning("%s: RTAS service <ibm,get-config-addr-info2> and "
-                       "<ibm,get-config-addr-info> invalid\n",
-                       __func__);
-               return -EINVAL;
        } else if (ibm_configure_pe == RTAS_UNKNOWN_SERVICE &&
                   ibm_configure_bridge == RTAS_UNKNOWN_SERVICE) {
                pr_warning("%s: RTAS service <ibm,configure-pe> and "