powerpc/vas: Print CRB and FIFO values

Dump FIFO entries 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@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1587017099.2275.1067.camel@hbabu-laptop

diff --git a/arch/powerpc/platforms/powernv/vas-fault.c b/arch/powerpc/platforms/powernv/vas-fault.c
index b6bec64..25db70b 100644 (file)
--- 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, nx->fault_status);
+}
+
 /*
  * Update the CSB to indicate a translation error.
  *
@@ -148,6 +170,23 @@ static void update_csb(struct vas_window *window,
                        pid_vnr(pid), rc);
 }
 
+static void dump_fifo(struct vas_instance *vinst, void *entry)
+{
+       unsigned long *end = vinst->fault_fifo + vinst->fault_fifo_size;
+       unsigned long *fifo = entry;
+       int i;
+
+       pr_err("Fault fifo size %d, Max crbs %d\n", vinst->fault_fifo_size,
+                       vinst->fault_fifo_size / CRB_SIZE);
+
+       /* Dump 10 CRB entries or until end of FIFO */
+       pr_err("Fault FIFO Dump:\n");
+       for (i = 0; i < 10*(CRB_SIZE/8) && fifo < end; 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 valid CRBs in fault FIFO.
  * NX process user space requests, return credit and update the status
@@ -233,6 +272,7 @@ irqreturn_t vas_fault_thread_fn(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));
 
@@ -245,6 +285,7 @@ irqreturn_t vas_fault_thread_fn(int irq, void *data)
                         * But we should not get here.
                         * TODO: Disable IRQ.
                         */
+                       dump_fifo(vinst, (void *)entry);
                        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),