On Wed, Nov 23, 2016 at 12:28:34PM +0100, Auger Eric wrote:
> Hi,
>
> On 14/11/2016 22:08, Andrew Jones wrote:
> > Allow user to select who sends ipis and with which irq,
> > rather than just always sending irq=0 from cpu0.
> From a user point of view is there a way to know the list of available
> tests and their arg?
Not at the moment. I could change the arg-less run and/or add
a '-h' though that would provide a usage. So far unit tests
have never had -h's, but it's not a bad idea.
> >
> > Signed-off-by: Andrew Jones <drjones@xxxxxxxxxx>
> >
> > ---
> > v6:
> > - make sender/irq names more future-proof [drew]
> > - sanity check inputs [drew]
> > - introduce check_sender/irq and bad_sender/irq to more
> > cleanly do checks [drew]
> > - default sender and irq to 1, instead of still zero [drew]
> > v4: improve structure and make sure spurious checking is
> > done even when the sender isn't cpu0
> > v2: actually check that the irq received was the irq sent,
> > and (for gicv2) that the sender is the expected one.
> > ---
> > arm/gic.c | 124 +++++++++++++++++++++++++++++++++++++++++++++++++-------------
> > 1 file changed, 99 insertions(+), 25 deletions(-)
> >
> > diff --git a/arm/gic.c b/arm/gic.c
> > index d954a3775c26..638b8b140c96 100644
> > --- a/arm/gic.c
> > +++ b/arm/gic.c
> > @@ -11,6 +11,7 @@
> > * This work is licensed under the terms of the GNU LGPL, version 2.
> > */
> > #include <libcflat.h>
> > +#include <util.h>
> > #include <asm/setup.h>
> > #include <asm/processor.h>
> > #include <asm/gic.h>
> > @@ -28,6 +29,8 @@ struct gic {
> >
> > static struct gic *gic;
> > static int acked[NR_CPUS], spurious[NR_CPUS];
> > +static int bad_sender[NR_CPUS], bad_irq[NR_CPUS];
> > +static int cmdl_sender = 1, cmdl_irq = 1;
> > static cpumask_t ready;
> >
> > static void nr_cpu_check(int nr)
> > @@ -43,10 +46,23 @@ static void wait_on_ready(void)
> > cpu_relax();
> > }
> >
> > +static void stats_reset(void)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < nr_cpus; ++i) {
> > + acked[i] = 0;
> > + bad_sender[i] = -1;
> > + bad_irq[i] = -1;
> > + }
> > + smp_wmb();
> > +}
> > +
> > static void check_acked(cpumask_t *mask)
> > {
> > int missing = 0, extra = 0, unexpected = 0;
> > int nr_pass, cpu, i;
> > + bool bad = false;
> >
> > /* Wait up to 5s for all interrupts to be delivered */
> > for (i = 0; i < 50; ++i) {
> > @@ -56,9 +72,21 @@ static void check_acked(cpumask_t *mask)
> > smp_rmb();
> > nr_pass += cpumask_test_cpu(cpu, mask) ?
> > acked[cpu] == 1 : acked[cpu] == 0;
> > +
> > + if (bad_sender[cpu] != -1) {
> > + printf("cpu%d received IPI from wrong sender %d\n",
> > + cpu, bad_sender[cpu]);
> > + bad = true;
> > + }
> > +
> > + if (bad_irq[cpu] != -1) {
> > + printf("cpu%d received wrong irq %d\n",
> > + cpu, bad_irq[cpu]);
> > + bad = true;
> > + }
> > }
> > if (nr_pass == nr_cpus) {
> > - report("Completed in %d ms", true, ++i * 100);
> > + report("Completed in %d ms", !bad, ++i * 100);
> > return;
> > }
> > }
> > @@ -91,6 +119,22 @@ static void check_spurious(void)
> > }
> > }
> >
> > +static void check_ipi_sender(u32 irqstat)
> > +{
> > + if (gic_version() == 2) {
> > + int src = (irqstat >> 10) & 7;
> > +
> > + if (src != cmdl_sender)
> > + bad_sender[smp_processor_id()] = src;
> > + }
> > +}
> > +
> > +static void check_irqnr(u32 irqnr)
> > +{
> > + if (irqnr != (u32)cmdl_irq)
> > + bad_irq[smp_processor_id()] = irqnr;
> > +}
> > +
> > static void ipi_handler(struct pt_regs *regs __unused)
> > {
> > u32 irqstat = gic_read_iar();
> > @@ -98,8 +142,10 @@ static void ipi_handler(struct pt_regs *regs __unused)
> >
> > if (irqnr != GICC_INT_SPURIOUS) {
> > gic_write_eoir(irqstat);
> > - smp_rmb(); /* pairs with wmb in ipi_test functions */
> > + smp_rmb(); /* pairs with wmb in stats_reset */
> > ++acked[smp_processor_id()];
> > + check_ipi_sender(irqstat);
> > + check_irqnr(irqnr);
> > smp_wmb(); /* pairs with rmb in check_acked */
> > } else {
> > ++spurious[smp_processor_id()];
> > @@ -109,19 +155,19 @@ static void ipi_handler(struct pt_regs *regs __unused)
> >
> > static void gicv2_ipi_send_self(void)
> > {
> > - writel(2 << 24, gicv2_dist_base() + GICD_SGIR);
> > + writel(2 << 24 | cmdl_irq, gicv2_dist_base() + GICD_SGIR);
> > }
> >
> > -static void gicv2_ipi_send_tlist(cpumask_t *mask, int irq __unused)
> > +static void gicv2_ipi_send_tlist(cpumask_t *mask, int irq)
> > {
> > u8 tlist = (u8)cpumask_bits(mask)[0];
> >
> > - writel(tlist << 16, gicv2_dist_base() + GICD_SGIR);
> > + writel(tlist << 16 | irq, gicv2_dist_base() + GICD_SGIR);
> > }
> >
> > static void gicv2_ipi_send_broadcast(void)
> > {
> > - writel(1 << 24, gicv2_dist_base() + GICD_SGIR);
> > + writel(1 << 24 | cmdl_irq, gicv2_dist_base() + GICD_SGIR);
> > }
> >
> > static void gicv3_ipi_send_self(void)
> > @@ -130,12 +176,12 @@ static void gicv3_ipi_send_self(void)
> >
> > cpumask_clear(&mask);
> > cpumask_set_cpu(smp_processor_id(), &mask);
> > - gicv3_ipi_send_tlist(&mask, 0);
> > + gicv3_ipi_send_tlist(&mask, cmdl_irq);
> > }
> >
> > static void gicv3_ipi_send_broadcast(void)
> > {
> > - gicv3_write_sgi1r(1ULL << 40);
> > + gicv3_write_sgi1r(1ULL << 40 | cmdl_irq << 24);
> > isb();
> > }
> >
> > @@ -144,10 +190,9 @@ static void ipi_test_self(void)
> > cpumask_t mask;
> >
> > report_prefix_push("self");
> > - memset(acked, 0, sizeof(acked));
> > - smp_wmb();
> > + stats_reset();
> > cpumask_clear(&mask);
> > - cpumask_set_cpu(0, &mask);
> > + cpumask_set_cpu(smp_processor_id(), &mask);
> > gic->ipi.send_self();
> > check_acked(&mask);
> > report_prefix_pop();
> > @@ -159,20 +204,18 @@ static void ipi_test_smp(void)
> > int i;
> >
> > report_prefix_push("target-list");
> > - memset(acked, 0, sizeof(acked));
> > - smp_wmb();
> > + stats_reset();
> > cpumask_copy(&mask, &cpu_present_mask);
> > - for (i = 0; i < nr_cpus; i += 2)
> > + for (i = smp_processor_id() & 1; i < nr_cpus; i += 2)
> > cpumask_clear_cpu(i, &mask);
> > - gic->ipi.send_tlist(&mask, 0);
> > + gic->ipi.send_tlist(&mask, cmdl_irq);
> > check_acked(&mask);
> > report_prefix_pop();
> >
> > report_prefix_push("broadcast");
> > - memset(acked, 0, sizeof(acked));
> > - smp_wmb();
> > + stats_reset();
> > cpumask_copy(&mask, &cpu_present_mask);
> > - cpumask_clear_cpu(0, &mask);
> > + cpumask_clear_cpu(smp_processor_id(), &mask);
> > gic->ipi.send_broadcast();
> > check_acked(&mask);
> > report_prefix_pop();
> > @@ -189,6 +232,16 @@ static void ipi_enable(void)
> > local_irq_enable();
> > }
> >
> > +static void ipi_send(void)
> > +{
> > + ipi_enable();
> > + wait_on_ready();
> > + ipi_test_self();
> > + ipi_test_smp();
> > + check_spurious();
> > + exit(report_summary());
> > +}
> > +
> > static void ipi_recv(void)
> > {
> > ipi_enable();
> > @@ -197,6 +250,14 @@ static void ipi_recv(void)
> > wfi();
> > }
> >
> > +static void ipi_test(void)
> > +{
> > + if (smp_processor_id() == cmdl_sender)
> > + ipi_send();
> > + else
> > + ipi_recv();
> > +}
> > +
> > static struct gic gicv2 = {
> > .ipi = {
> > .send_self = gicv2_ipi_send_self,
> > @@ -242,21 +303,34 @@ int main(int argc, char **argv)
> > report_prefix_pop();
> >
> > } else if (strcmp(argv[1], "ipi") == 0) {
> > + int off, i = 1;
> > + long val;
> >
> > report_prefix_push(argv[1]);
> > nr_cpu_check(2);
> >
> > + while (--argc != 1) {
> > + off = parse_keyval(argv[++i], &val);
> > + if (off == -1)
> > + continue;
> > + argv[i][off] = '\0';
> > + if (strcmp(argv[i], "sender") == 0) {
> > + if (val >= nr_cpus)
> > + report_abort("invalid sender %d, nr_cpus=%d", val, nr_cpus);
> > + cmdl_sender = val;
> > + } else if (strcmp(argv[i], "irq") == 0) {
> > + if (val > 15)
> > + report_abort("irq (SGI) must be < 16");
> > + cmdl_irq = val;
> > + }
> wrong arg could potentially be tested.
What do you mean by 'wrong arg'? Can you give me an example?
>
> Besides
> Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx>
Thanks!
drew
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