[Qemu-devel] [kvm-unit-tests PATCH v5 11/11] arm/arm64: gic: don't just use zero

[Andrew Jones]

Allow user to select who sends ipis and with which irq,
rather than just always sending irq=0 from cpu0.

Signed-off-by: Andrew Jones <address@hidden>

---
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 | 99 ++++++++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 73 insertions(+), 26 deletions(-)

diff --git a/arm/gic.c b/arm/gic.c
index ca68f8ad1cb9..af9e745e2e5c 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>
@@ -34,6 +35,8 @@ static struct gic *gic;
 static int gic_version;
 static int acked[NR_CPUS], spurious[NR_CPUS];
 static cpumask_t ready;
+static int sender;
+static u32 irq;
 
 static void nr_cpu_check(int nr)
 {
@@ -86,7 +89,16 @@ static void check_acked(cpumask_t *mask)
 
 static u32 gicv2_read_iar(void)
 {
-       return readl(gicv2_cpu_base() + GICC_IAR);
+       u32 iar = readl(gicv2_cpu_base() + GICC_IAR);
+       int src = (iar >> 10) & 7;
+
+       if (src != sender) {
+               report("cpu%d received IPI from unexpected source cpu%d "
+                      "(expected cpu%d)",
+                      false, smp_processor_id(), src, sender);
+       }
+
+       return iar;
 }
 
 static u32 gicv2_irqnr(u32 iar)
@@ -111,9 +123,15 @@ static void ipi_handler(struct pt_regs *regs __unused)
 
        if (irqnr != GICC_INT_SPURIOUS) {
                gic->write_eoi(irqstat);
-               smp_rmb(); /* pairs with wmb in ipi_test functions */
-               ++acked[smp_processor_id()];
-               smp_wmb(); /* pairs with rmb in check_acked */
+               if (irqnr == irq) {
+                       smp_rmb(); /* pairs with wmb in ipi_test functions */
+                       ++acked[smp_processor_id()];
+                       smp_wmb(); /* pairs with rmb in check_acked */
+               } else {
+                       report("cpu%d received unexpected irq %u "
+                              "(expected %u)",
+                              false, smp_processor_id(), irqnr, irq);
+               }
        } else {
                ++spurious[smp_processor_id()];
                smp_wmb();
@@ -122,19 +140,19 @@ 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 | irq, gicv2_dist_base() + GICD_SGIR);
 }
 
 static void gicv2_ipi_send_tlist(cpumask_t *mask)
 {
        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 | irq, gicv2_dist_base() + GICD_SGIR);
 }
 
 #define ICC_SGI1R_AFFINITY_1_SHIFT     16
@@ -200,7 +218,7 @@ static void gicv3_ipi_send_tlist(cpumask_t *mask)
                /* Send the IPIs for the target list of this cluster */
                sgi1r = (MPIDR_TO_SGI_AFFINITY(cluster_id, 3)   |
                         MPIDR_TO_SGI_AFFINITY(cluster_id, 2)   |
-                        /* irq << 24                           | */
+                        irq << 24                              |
                         MPIDR_TO_SGI_AFFINITY(cluster_id, 1)   |
                         tlist);
 
@@ -222,7 +240,7 @@ static void gicv3_ipi_send_self(void)
 
 static void gicv3_ipi_send_broadcast(void)
 {
-       gicv3_write_sgi1r(1ULL << 40);
+       gicv3_write_sgi1r(1ULL << 40 | irq << 24);
        isb();
 }
 
@@ -234,7 +252,7 @@ static void ipi_test_self(void)
        memset(acked, 0, sizeof(acked));
        smp_wmb();
        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();
@@ -249,7 +267,7 @@ static void ipi_test_smp(void)
        memset(acked, 0, sizeof(acked));
        smp_wmb();
        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);
        check_acked(&mask);
@@ -259,7 +277,7 @@ static void ipi_test_smp(void)
        memset(acked, 0, sizeof(acked));
        smp_wmb();
        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();
@@ -276,6 +294,27 @@ static void ipi_enable(void)
        local_irq_enable();
 }
 
+static void ipi_send(void)
+{
+       int cpu;
+
+       ipi_enable();
+       wait_on_ready();
+       ipi_test_self();
+       ipi_test_smp();
+
+       smp_rmb();
+       for_each_present_cpu(cpu) {
+               if (spurious[cpu]) {
+                       printf("ipi: WARN: cpu%d got %d spurious "
+                              "interrupts\n",
+                              spurious[cpu], smp_processor_id());
+               }
+       }
+
+       exit(report_summary());
+}
+
 static void ipi_recv(void)
 {
        ipi_enable();
@@ -284,6 +323,14 @@ static void ipi_recv(void)
                wfi();
 }
 
+static void ipi_test(void)
+{
+       if (smp_processor_id() == sender)
+               ipi_send();
+       else
+               ipi_recv();
+}
+
 struct gic gicv2 = {
        .ipi = {
                .enable = gicv2_enable_defaults,
@@ -337,30 +384,30 @@ int main(int argc, char **argv)
                report_prefix_pop();
 
        } else if (!strcmp(argv[1], "ipi")) {
+               int off, i = 1;
+               long val;
 
                report_prefix_push(argv[1]);
                nr_cpu_check(2);
 
-               for_each_present_cpu(cpu) {
-                       if (cpu == 0)
+               while (--argc != 1) {
+                       off = parse_keyval(argv[++i], &val);
+                       if (off == -1)
                                continue;
-                       smp_boot_secondary(cpu, ipi_recv);
+                       argv[i][off] = '\0';
+                       if (strcmp(argv[i], "sender") == 0)
+                               sender = val;
+                       else if (strcmp(argv[i], "irq") == 0)
+                               irq = val;
                }
-               ipi_enable();
-               wait_on_ready();
-               ipi_test_self();
-               ipi_test_smp();
 
-               smp_rmb();
                for_each_present_cpu(cpu) {
-                       if (spurious[cpu]) {
-                               printf("ipi: WARN: cpu%d got %d spurious "
-                                      "interrupts\n",
-                                      spurious[cpu], smp_processor_id());
-                       }
+                       if (cpu == 0)
+                               continue;
+                       smp_boot_secondary(cpu, ipi_test);
                }
 
-               report_prefix_pop();
+               ipi_test();
 
        } else {
                report_abort("Unknown subtest '%s'", argv[1]);
-- 
2.7.4