On EEH events the kernel will print a dump of relevant registers. If EEH is unavailable (i.e. CONFIG_EEH is disabled, a new platform doesn't have EEH support, etc) this information isn't readily available.
Add a new debugfs handler to trigger a PHB register dump, so that this information can be made available on demand. Signed-off-by: Russell Currey <[email protected]> --- arch/powerpc/platforms/powernv/pci-ioda.c | 35 +++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index 891fc4a..ada2f3c 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -3018,6 +3018,38 @@ static void pnv_ioda_setup_pe_seg(struct pnv_ioda_pe *pe) } } +#ifdef CONFIG_DEBUG_FS +static ssize_t pnv_pci_debug_write(struct file *filp, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct pci_controller *hose = filp->private_data; + struct pnv_phb *phb; + int ret = 0; + + if (!hose) + return -EFAULT; + + phb = hose->private_data; + if (!phb) + return -EFAULT; + + ret = opal_pci_get_phb_diag_data2(phb->opal_id, phb->diag.blob, + PNV_PCI_DIAG_BUF_SIZE); + + if (!ret) + pnv_pci_dump_phb_diag_data(phb->hose, phb->diag.blob); + + return ret < 0 ? ret : count; +} + +static const struct file_operations pnv_pci_debug_ops = { + .open = simple_open, + .llseek = no_llseek, + .write = pnv_pci_debug_write, +}; +#endif /* CONFIG_DEBUG_FS */ + static void pnv_pci_ioda_create_dbgfs(void) { #ifdef CONFIG_DEBUG_FS @@ -3036,6 +3068,9 @@ static void pnv_pci_ioda_create_dbgfs(void) if (!phb->dbgfs) pr_warning("%s: Error on creating debugfs on PHB#%x\n", __func__, hose->global_number); + + debugfs_create_file("regdump", 0200, phb->dbgfs, hose, + &pnv_pci_debug_ops); } #endif /* CONFIG_DEBUG_FS */ } -- 2.9.0 _______________________________________________ Linuxppc-dev mailing list [email protected] https://lists.ozlabs.org/listinfo/linuxppc-dev
