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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
This commit is contained in:
Haren Myneni 2020-04-15 23:04:59 -07:00 committed by Michael Ellerman
parent 461862ef94
commit cf33e1e938
1 changed files with 41 additions and 0 deletions
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41
arch/powerpc/platforms/powernv/vas-fault.c
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@ -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),