[PATCH 3/3] powernv/pci: Add a debugfs entry to dump PHB's IODA PE state

[Oliver O'Halloran <oohall@gmail.com>]

Add a debugfs entry to dump the state of the active IODA PEs. The IODA PE
state reflects how the PHB's internal concept of a PE is configured. This
is separate to the EEH PE state and is managed power the PowerNV PCI
backend rather than the EEH core.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
---
 arch/powerpc/platforms/powernv/pci-ioda.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index f684d3a..941902b 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -3061,6 +3061,33 @@ static int pnv_pci_diag_data_set(void *data, u64 val)
 DEFINE_SIMPLE_ATTRIBUTE(pnv_pci_diag_data_fops, NULL,
 			pnv_pci_diag_data_set, "%llu\n");
 
+static int pnv_pci_ioda_pe_dump(void *data, u64 val)
+{
+	struct pnv_phb *phb = data;
+	int pe_num;
+
+	for (pe_num = 0; pe_num < phb->ioda.total_pe_num; pe_num++) {
+		struct pnv_ioda_pe *pe = &phb->ioda.pe_array[pe_num];
+
+		if (!test_bit(pe_num, phb->ioda.pe_alloc))
+			continue;
+
+		pe_warn(pe, "rid: %04x dev count: %2d flags: %s%s%s%s%s%s\n",
+			pe->rid, pe->device_count,
+			(pe->flags & PNV_IODA_PE_DEV) ? "dev " : "",
+			(pe->flags & PNV_IODA_PE_BUS) ? "bus " : "",
+			(pe->flags & PNV_IODA_PE_BUS_ALL) ? "all " : "",
+			(pe->flags & PNV_IODA_PE_MASTER) ? "master " : "",
+			(pe->flags & PNV_IODA_PE_SLAVE) ? "slave " : "",
+			(pe->flags & PNV_IODA_PE_VF) ? "vf " : "");
+	}
+
+	return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(pnv_pci_ioda_pe_dump_fops, NULL,
+			pnv_pci_ioda_pe_dump, "%llu\n");
+
 #endif /* CONFIG_DEBUG_FS */
 
 static void pnv_pci_ioda_create_dbgfs(void)
@@ -3086,6 +3113,8 @@ static void pnv_pci_ioda_create_dbgfs(void)
 
 		debugfs_create_file("dump_diag_regs", 0200, phb->dbgfs, phb,
 				    &pnv_pci_diag_data_fops);
+		debugfs_create_file("dump_ioda_pe_state", 0200, phb->dbgfs, phb,
+				    &pnv_pci_ioda_pe_dump_fops);
 	}
 #endif /* CONFIG_DEBUG_FS */
 }
-- 
2.9.5