powrpc/powernv: Reset PHB in kdump kernel
In the kdump scenario, the first kerenl doesn't shutdown PCI devices
and the kdump kerenl clean PHB IODA table at the early probe time.
That means the kdump kerenl can't support PCI transactions piled
by the first kerenl. Otherwise, lots of EEH errors and frozen PEs
will be detected.
In order to avoid the EEH errors, the PHB is resetted to drop all
PCI transaction from the first kerenl.
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/platforms/powernv/eeh-ioda.c b/arch/powerpc/platforms/powernv/eeh-ioda.c
index 58ef809..753f08e 100644
--- a/arch/powerpc/platforms/powernv/eeh-ioda.c
+++ b/arch/powerpc/platforms/powernv/eeh-ioda.c
@@ -388,13 +388,16 @@
if (rc <= 0)
break;
- msleep(rc);
+ if (system_state < SYSTEM_RUNNING)
+ udelay(1000 * rc);
+ else
+ msleep(rc);
}
return rc;
}
-static int ioda_eeh_phb_reset(struct pci_controller *hose, int option)
+int ioda_eeh_phb_reset(struct pci_controller *hose, int option)
{
struct pnv_phb *phb = hose->private_data;
s64 rc = OPAL_HARDWARE;
@@ -422,8 +425,12 @@
* need the PCI bus settlement delay.
*/
rc = ioda_eeh_phb_poll(phb);
- if (option == EEH_RESET_DEACTIVATE)
- msleep(EEH_PE_RST_SETTLE_TIME);
+ if (option == EEH_RESET_DEACTIVATE) {
+ if (system_state < SYSTEM_RUNNING)
+ udelay(1000 * EEH_PE_RST_SETTLE_TIME);
+ else
+ msleep(EEH_PE_RST_SETTLE_TIME);
+ }
out:
if (rc != OPAL_SUCCESS)
return -EIO;
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index a179ff0..8ee4787 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -13,6 +13,7 @@
#include <linux/kernel.h>
#include <linux/pci.h>
+#include <linux/crash_dump.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/string.h>
@@ -1393,6 +1394,17 @@
rc = opal_pci_reset(phb_id, OPAL_PCI_IODA_TABLE_RESET, OPAL_ASSERT_RESET);
if (rc)
pr_warning(" OPAL Error %ld performing IODA table reset !\n", rc);
+
+ /* If we're running in kdump kerenl, the previous kerenl never
+ * shutdown PCI devices correctly. We already got IODA table
+ * cleaned out. So we have to issue PHB reset to stop all PCI
+ * transactions from previous kerenl.
+ */
+ if (is_kdump_kernel()) {
+ pr_info(" Issue PHB reset ...\n");
+ ioda_eeh_phb_reset(hose, EEH_RESET_FUNDAMENTAL);
+ ioda_eeh_phb_reset(hose, OPAL_DEASSERT_RESET);
+ }
}
void __init pnv_pci_init_ioda2_phb(struct device_node *np)
diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h
index 34a0974..676232c 100644
--- a/arch/powerpc/platforms/powernv/pci.h
+++ b/arch/powerpc/platforms/powernv/pci.h
@@ -205,5 +205,6 @@
extern void pnv_pci_ioda_tce_invalidate(struct iommu_table *tbl,
__be64 *startp, __be64 *endp, bool rm);
extern void pnv_pci_reset_secondary_bus(struct pci_dev *dev);
+extern int ioda_eeh_phb_reset(struct pci_controller *hose, int option);
#endif /* __POWERNV_PCI_H */