diff options
| author | Gavin Shan <gwshan@linux.vnet.ibm.com> | 2014-04-10 08:29:53 +1000 |
|---|---|---|
| committer | Eli Qiao <taget@linux.vnet.ibm.com> | 2014-04-14 10:12:35 +0800 |
| commit | 716a0e89e5d7f1bd9398bb96b603e15a9cffd2f8 (patch) | |
| tree | 5471581d262fe7b39529ccc71bec35729ee242c9 | |
| parent | 354580fbfa50626718808ad2a67758b7e2833edf (diff) | |
| download | powerpc-716a0e89e5d7f1bd9398bb96b603e15a9cffd2f8.tar.gz | |
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. It looks good on P7, but need
to be verified on P8.
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| -rw-r--r-- | arch/powerpc/platforms/powernv/eeh-ioda.c | 15 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/pci-ioda.c | 12 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/pci.h | 1 |
3 files changed, 24 insertions, 4 deletions
diff --git a/arch/powerpc/platforms/powernv/eeh-ioda.c b/arch/powerpc/platforms/powernv/eeh-ioda.c index 431ca6c24158b0..7eef37838fdccc 100644 --- a/arch/powerpc/platforms/powernv/eeh-ioda.c +++ b/arch/powerpc/platforms/powernv/eeh-ioda.c @@ -388,13 +388,16 @@ static s64 ioda_eeh_phb_poll(struct pnv_phb *phb) 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 @@ static int ioda_eeh_phb_reset(struct pci_controller *hose, int option) * 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 e8f54ec18b9c0d..1c8869654413bb 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> @@ -1389,6 +1390,17 @@ void __init pnv_pci_init_ioda_phb(struct device_node *np, 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 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 3208a6f2d86cd3..224eb1c692910b 100644 --- a/arch/powerpc/platforms/powernv/pci.h +++ b/arch/powerpc/platforms/powernv/pci.h @@ -205,5 +205,6 @@ extern void pnv_pci_init_ioda2_phb(struct device_node *np); extern void pnv_pci_ioda_tce_invalidate(struct iommu_table *tbl, u64 *startp, u64 *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 */ |