[PATCH v11 10/14] powerpc/vas: Print CRB and FIFO values

From: Haren Myneni
Date: Thu Apr 16 2020 - 02:06:10 EST



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

Signed-off-by: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Haren Myneni <haren@xxxxxxxxxxxxx>
---
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 b6bec64..25db70b 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, 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),
--
1.8.3.1