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| author | Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com> | 2017-11-17 19:58:59 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-01-21 19:48:35 +0100 |
| commit | 45baee1416a0086dccaa8a94c70e6721a6906fa2 (patch) | |
| tree | b0ab9ded221b29cf0384ac22eadcd8ff97b64b09 | |
| parent | powerpc/pseries: Don't give a warning when HPT resizing isn't available (diff) | |
| download | linux-45baee1416a0086dccaa8a94c70e6721a6906fa2.tar.xz linux-45baee1416a0086dccaa8a94c70e6721a6906fa2.zip | |
powerpc/powernv: Add ppc_pci_reset_phbs parameter to issue a PHB reset
During a kdump kernel boot in PowerPC, we request a reset of the PHBs
to the FW. It makes sense, since if we are booting a kdump kernel it
means we had some trouble before and we cannot rely in the adapters'
health; they could be in a bad state, hence the reset is needed.
But this reset is useful not only in kdump - there are situations,
specially when debugging drivers, that we could break an adapter in
a way it requires such reset. One can tell to just go ahead and
reboot the machine, but happens that many times doing kexec is much
faster, and so preferable than a full power cycle.
This patch adds the ppc_pci_reset_phbs parameter to perform such reset.
Signed-off-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| -rw-r--r-- | arch/powerpc/platforms/powernv/pci-ioda.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index 1069f9cb273a..973cfb698180 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -89,6 +89,7 @@ void pe_level_printk(const struct pnv_ioda_pe *pe, const char *level, } static bool pnv_iommu_bypass_disabled __read_mostly; +static bool pci_reset_phbs __read_mostly; static int __init iommu_setup(char *str) { @@ -110,6 +111,14 @@ static int __init iommu_setup(char *str) } early_param("iommu", iommu_setup); +static int __init pci_reset_phbs_setup(char *str) +{ + pci_reset_phbs = true; + return 0; +} + +early_param("ppc_pci_reset_phbs", pci_reset_phbs_setup); + static inline bool pnv_pci_is_m64(struct pnv_phb *phb, struct resource *r) { /* @@ -4033,9 +4042,10 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np, * If we're running in kdump kernel, the previous kernel 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 kernel. + * transactions from previous kernel. The ppc_pci_reset_phbs + * kernel parameter will force this reset too. */ - if (is_kdump_kernel()) { + if (is_kdump_kernel() || pci_reset_phbs) { pr_info(" Issue PHB reset ...\n"); pnv_eeh_phb_reset(hose, EEH_RESET_FUNDAMENTAL); pnv_eeh_phb_reset(hose, EEH_RESET_DEACTIVATE); |