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powerpc/powernv/pci: Add PHB register dump debugfs handle

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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 <ruscur@russell.cc>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Russell Currey 2016-07-28 15:05:03 +10:00 committed by Michael Ellerman
parent 3eabf88579
commit 98b665da57
1 changed files with 38 additions and 1 deletions
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39
arch/powerpc/platforms/powernv/pci-ioda.c
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@ -3025,6 +3025,38 @@ 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;
s64 ret;
if (val != 1ULL)
return -EINVAL;
hose = (struct pci_controller *)data;
if (!hose || !hose->private_data)
return -ENODEV;
phb = hose->private_data;
/* 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
@ -3040,9 +3072,14 @@ 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_diag_regs", 0200, phb->dbgfs, hose,
&pnv_pci_diag_data_fops);
}
#endif /* CONFIG_DEBUG_FS */
}