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Commit 98b665da authored by Russell Currey's avatar Russell Currey Committed by Michael Ellerman
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powerpc/powernv/pci: Add PHB register dump debugfs handle 



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: default avatarRussell Currey <ruscur@russell.cc>
Reviewed-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 3eabf885

arch/powerpc/platforms/powernv/pci-ioda.c

+38 −1
Original line number Diff line number Diff line
@@ -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 */

}