Commit cf33e1e9 authored by Haren Myneni's avatar Haren Myneni Committed by Michael Ellerman
Browse files

powerpc/vas: Print CRB and FIFO values 



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

Signed-off-by: default avatarSukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: default avatarHaren Myneni <haren@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1587017099.2275.1067.camel@hbabu-laptop
parent 461862ef

arch/powerpc/platforms/powernv/vas-fault.c

+41 −0
Original line number Diff line number Diff line
@@ -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),