[PATCH V2 09/13] powerpc/vas: Print CRB and FIFO values

[Haren Myneni <haren@linux.ibm.com>]

Dump FIFO entry values if could not find send window and print CRB
for debugging.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Haren Myneni <haren@us.ibm.com>
---
 arch/powerpc/platforms/powernv/vas-fault.c | 41 ++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/arch/powerpc/platforms/powernv/vas-fault.c b/arch/powerpc/platforms/powernv/vas-fault.c
index 88a211b..cf41b65 100644
--- a/arch/powerpc/platforms/powernv/vas-fault.c
+++ b/arch/powerpc/platforms/powernv/vas-fault.c
@@ -26,6 +26,28 @@
  */
 #define VAS_FAULT_WIN_FIFO_SIZE	(4 << 20)
 
+static void dump_crb(struct coprocessor_request_block *crb)
+{
+	struct data_descriptor_entry *dde;
+	struct nx_fault_stamp *nx;
+
+	dde = &crb->source;
+	pr_devel("SrcDDE: addr 0x%llx, len %d, count %d, idx %d, flags %d\n",
+		be64_to_cpu(dde->address), be32_to_cpu(dde->length),
+		dde->count, dde->index, dde->flags);
+
+	dde = &crb->target;
+	pr_devel("TgtDDE: addr 0x%llx, len %d, count %d, idx %d, flags %d\n",
+		be64_to_cpu(dde->address), be32_to_cpu(dde->length),
+		dde->count, dde->index, dde->flags);
+
+	nx = &crb->stamp.nx;
+	pr_devel("NX Stamp: PSWID 0x%x, FSA 0x%llx, flags 0x%x, FS 0x%x\n",
+		be32_to_cpu(nx->pswid),
+		be64_to_cpu(crb->stamp.nx.fault_storage_addr),
+		nx->flags, be32_to_cpu(nx->fault_status));
+}
+
 static void notify_process(pid_t pid, u64 fault_addr)
 {
 	int rc;
@@ -154,6 +176,23 @@ static void update_csb(struct vas_window *window,
 	}
 }
 
+static void dump_fifo(struct vas_instance *vinst, void *entry)
+{
+	int i;
+	unsigned long *fifo = entry;
+
+	pr_err("Fault fifo size %d, max crbs %d, crb size %lu\n",
+			vinst->fault_fifo_size,
+			vinst->fault_fifo_size / CRB_SIZE,
+			sizeof(struct coprocessor_request_block));
+
+	pr_err("Fault FIFO Entry Dump:\n");
+	for (i = 0; i < CRB_SIZE; i += 4, fifo += 4) {
+		pr_err("[%.3d, %p]: 0x%.16lx 0x%.16lx 0x%.16lx 0x%.16lx\n",
+			i, fifo, *fifo, *(fifo+1), *(fifo+2), *(fifo+3));
+	}
+}
+
 /*
  * Process CRBs that we receive on the fault window.
  */
@@ -212,6 +251,7 @@ irqreturn_t vas_fault_handler(int irq, void *data)
 				vinst->vas_id, vinst->fault_fifo, fifo,
 				vinst->fault_crbs);
 
+		dump_crb(crb);
 		window = vas_pswid_to_window(vinst,
 				be32_to_cpu(crb->stamp.nx.pswid));
 
@@ -222,6 +262,7 @@ irqreturn_t vas_fault_handler(int irq, void *data)
 			 * even clean it up (return credit).
 			 * But we should not get here.
 			 */
+			dump_fifo(vinst, (void *)crb);
 			pr_err("VAS[%d] fault_fifo %p, fifo %p, pswid 0x%x, fault_crbs %d bad CRB?\n",
 				vinst->vas_id, vinst->fault_fifo, fifo,
 				be32_to_cpu(crb->stamp.nx.pswid),
-- 
1.8.3.1