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 <rus...@russell.cc>
---
V2 changes:
- use a simple attribute instead of full fops thanks to mpe
- miscellanous fixes thanks to Gavin
- rename from "regdump" to "dump_regs"
---
arch/powerpc/platforms/powernv/pci-ioda.c | 43 ++++++++++++++++++++++++++++++-
1 file changed, 42 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c
b/arch/powerpc/platforms/powernv/pci-ioda.c
index 891fc4a..2b9f114 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -3018,6 +3018,42 @@ static void pnv_ioda_setup_pe_seg(struct pnv_ioda_pe *pe)
}
}
+#ifdef CONFIG_DEBUG_FS
+static int pnv_pci_diag_data_set(void *data, u64 val)
+{
+ struct pci_controller *hose;
+ struct pnv_phb *phb;
+ int ret;
+
+ if (val != 1)
+ return -EINVAL;
+
+ hose = (struct pci_controller *)data;
+ if (!hose)
+ return -EFAULT;
+
+ phb = hose->private_data;
+ if (!phb)
+ return -EFAULT;
+
+ /* Retrieve the diag data from firmware */
+ ret = opal_pci_get_phb_diag_data2(phb->opal_id, phb->diag.blob,
+ PNV_PCI_DIAG_BUF_SIZE);
+ if (ret != OPAL_SUCCESS)
+ return -EIO;
+
+ /* Print the diag data to the kernel log */
+ pnv_pci_dump_phb_diag_data(phb->hose, phb->diag.blob);
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(pnv_pci_diag_data_fops,
+ NULL,
+ pnv_pci_diag_data_set,
+ "%llu\n");
+
+#endif /* CONFIG_DEBUG_FS */
+
static void pnv_pci_ioda_create_dbgfs(void)
{
#ifdef CONFIG_DEBUG_FS
@@ -3033,9 +3069,14 @@ static void pnv_pci_ioda_create_dbgfs(void)
sprintf(name, "PCI%04x", hose->global_number);
phb->dbgfs = debugfs_create_dir(name, powerpc_debugfs_root);
- if (!phb->dbgfs)
+ if (!phb->dbgfs) {
pr_warning("%s: Error on creating debugfs on PHB#%x\n",
__func__, hose->global_number);
+ continue;
+ }
+
+ debugfs_create_file("dump_regs", 0200, phb->dbgfs, hose,
+ &pnv_pci_diag_data_fops);
}
#endif /* CONFIG_DEBUG_FS */
}
--
2.9.0
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