[PATCH 4.15 024/163] powerpc/xive: Use hw CPU ids when configuring the CPU queues

Greg Kroah-Hartman
2018-02-21T12:47:33Z

From: Cédric Le Goater <clg@kaod.org>

commit 8e036c8d30a2cd9d8fc7442fbf6824e0a3e986e7 upstream.

The CPU event notification queues on sPAPR should be configured using
a hardware CPU identifier.

The problem did not show up on the Power Hypervisor because pHyp
supports 8 threads per core which keeps CPU number contiguous. This is
not the case on all sPAPR virtual machines, some use SMT=1.

Also improve error logging by adding the CPU number.

Fixes: eac1e731b59e ("powerpc/xive: guest exploitation of the XIVE interrupt controller")
Cc: stable@vger.kernel.org # v4.14+
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/powerpc/sysdev/xive/spapr.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)

--- a/arch/powerpc/sysdev/xive/spapr.c
+++ b/arch/powerpc/sysdev/xive/spapr.c
@@ -356,7 +356,8 @@ static int xive_spapr_configure_queue(u3

rc = plpar_int_get_queue_info(0, target, prio, &esn_page, &esn_size);
if (rc) {
- pr_err("Error %lld getting queue info prio %d\n", rc, prio);
+ pr_err("Error %lld getting queue info CPU %d prio %d\n", rc,
+ target, prio);
rc = -EIO;
goto fail;
}
@@ -370,7 +371,8 @@ static int xive_spapr_configure_queue(u3
/* Configure and enable the queue in HW */
rc = plpar_int_set_queue_config(flags, target, prio, qpage_phys, order);
if (rc) {
- pr_err("Error %lld setting queue for prio %d\n", rc, prio);
+ pr_err("Error %lld setting queue for CPU %d prio %d\n", rc,
+ target, prio);
rc = -EIO;
} else {
q->qpage = qpage;
@@ -389,8 +391,8 @@ static int xive_spapr_setup_queue(unsign
if (IS_ERR(qpage))
return PTR_ERR(qpage);

- return xive_spapr_configure_queue(cpu, q, prio, qpage,
- xive_queue_shift);
+ return xive_spapr_configure_queue(get_hard_smp_processor_id(cpu),
+ q, prio, qpage, xive_queue_shift);
}

static void xive_spapr_cleanup_queue(unsigned int cpu, struct xive_cpu *xc,
@@ -399,10 +401,12 @@ static void xive_spapr_cleanup_queue(uns
struct xive_q *q = &xc->queue[prio];
unsigned int alloc_order;
long rc;
+ int hw_cpu = get_hard_smp_processor_id(cpu);

- rc = plpar_int_set_queue_config(0, cpu, prio, 0, 0);
+ rc = plpar_int_set_queue_config(0, hw_cpu, prio, 0, 0);
if (rc)
- pr_err("Error %ld setting queue for prio %d\n", rc, prio);
+ pr_err("Error %ld setting queue for CPU %d prio %d\n", rc,
+ hw_cpu, prio);

alloc_order = xive_alloc_order(xive_queue_shift);
free_pages((unsigned long)q->qpage, alloc_order);