linux-kernel - [PATCH v9 10/13] powerpc/vas: Print CRB and FIFO values

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Date:   Wed, 01 Apr 2020 14:30:33 -0700
From:   Haren Myneni <haren@...ux.ibm.com>
To:     mpe@...erman.id.au
Cc:     npiggin@...il.com, mikey@...ling.org, herbert@...dor.apana.org.au,
        frederic.barrat@...ibm.com, srikar@...ux.vnet.ibm.com,
        linux-kernel@...r.kernel.org, hch@...radead.org, oohall@...il.com,
        clg@...d.org, sukadev@...ux.vnet.ibm.com,
        linuxppc-dev@...ts.ozlabs.org, ajd@...ux.ibm.com
Subject: [PATCH v9 10/13] 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@...ux.vnet.ibm.com>
Signed-off-by: Haren Myneni <haren@...ux.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 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