[RFC PATCH 08/13] powerpc/vas: Print CRB and FIFO values

[Haren Myneni]

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

Signed-off-by: Sukadev Bhattiprolu <suka...@linux.vnet.ibm.com>
Signed-off-by: Haren Myneni <ha...@us.ibm.com>
---
 arch/powerpc/platforms/powernv/vas-fault.c | 40 ++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/arch/powerpc/platforms/powernv/vas-fault.c 
b/arch/powerpc/platforms/powernv/vas-fault.c
index 7aacce9..1ce85b5 100644
--- a/arch/powerpc/platforms/powernv/vas-fault.c
+++ b/arch/powerpc/platforms/powernv/vas-fault.c
@@ -39,6 +39,27 @@ void vas_wakeup_fault_handler(int virq, void *arg)
        wake_up(&vinst->fault_wq);
 }
 
+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), crb_nx_fault_addr(crb),
+               nx->flags, be32_to_cpu(nx->fault_status));
+}
+
 /*
  * Check if the fault occurred in the CSB itself. Return true if so, false
  */
@@ -153,6 +174,23 @@ static void update_csb(int pid, struct 
coprocessor_request_block *crb)
        notify_process(pid, crb_nx_fault_addr(crb));
 }
 
+static void dump_fifo(struct vas_instance *vinst)
+{
+       int i;
+       unsigned long *fifo = vinst->fault_fifo;
+
+       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 Dump:\n");
+       for (i = 0; i < 64; 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.
  */
@@ -210,6 +248,7 @@ static void process_fault_crbs(struct vas_instance *vinst)
                                vinst->fault_fifo, fifo, vinst->fault_crbs,
                                atomic_read(&vinst->pending_fault));
 
+               dump_crb(crb);
                window = vas_pswid_to_window(vinst, crb_nx_pswid(crb));
 
                if (IS_ERR(window)) {
@@ -219,6 +258,7 @@ static void process_fault_crbs(struct vas_instance *vinst)
                         * even clean it up (return credit).
                         * But we should not get here.
                         */
+                       dump_fifo(vinst);
                        pr_err("VAS[%d] fault_fifo %p, fifo %p, pswid 0x%x, "
                                "fault_crbs %d, pending %d bad CRB?\n",
                                vinst->vas_id,
-- 
1.8.3.1