Some tests for the ITARGETS registers.
Bits corresponding to non-existent CPUs must be RAZ/WI.
These registers must be byte-accessible, also check that accesses beyond
the implemented IRQ limit are actually read-as-zero/write-ignore.
Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
---
arm/gic.c | 43 +++++++++++++++++++++++++++++++++++++++++++
lib/arm/asm/gic.h | 1 +
2 files changed, 44 insertions(+)
diff --git a/arm/gic.c b/arm/gic.c
index 57a2995..ed5642e 100644
--- a/arm/gic.c
+++ b/arm/gic.c
@@ -431,6 +431,46 @@ static void test_priorities(int nr_irqs, void *priptr)
writel(orig_prio, first_spi);
}
+/* GICD_ITARGETSR is only used by GICv2. */
+static void test_targets(int nr_irqs)
+{
+ void *targetsptr = gicv2_dist_base() + GICD_ITARGETSR;
+ u32 orig_targets;
+ u32 cpu_mask;
+ u32 pattern, reg;
+
+ orig_targets = readl(targetsptr + GIC_FIRST_SPI);
+ report_prefix_push("ITARGETSR");
+
+ cpu_mask = (1 << nr_cpus) - 1;
+ cpu_mask |= cpu_mask << 8;
+ cpu_mask |= cpu_mask << 16;
+
+ /* Check that bits for non implemented CPUs are RAZ/WI. */
+ if (nr_cpus < 8) {
+ writel(0xffffffff, targetsptr + GIC_FIRST_SPI);
+ report("bits for %d non-existent CPUs masked",
+ !(readl(targetsptr + GIC_FIRST_SPI) & ~cpu_mask),
+ 8 - nr_cpus);
+ } else {
+ report_skip("CPU masking (all CPUs implemented)");
+ }
+
+ report("accesses beyond limit RAZ/WI",
+ test_readonly_32(targetsptr + nr_irqs, true));
+
+ pattern = 0x0103020f;
+ writel(pattern, targetsptr + GIC_FIRST_SPI);
+ reg = readl(targetsptr + GIC_FIRST_SPI);
+ report("register content preserved (%08x => %08x)",
+ reg == (pattern & cpu_mask), pattern & cpu_mask, reg);
+
+ /* The TARGETS registers are byte accessible. */
+ test_byte_access(targetsptr + GIC_FIRST_SPI, pattern, cpu_mask);
+
+ writel(orig_targets, targetsptr + GIC_FIRST_SPI);
+}
+
static void gic_test_mmio(void)
{
u32 reg;
@@ -467,6 +507,9 @@ static void gic_test_mmio(void)
reg);
test_priorities(nr_irqs, gic_dist_base + GICD_IPRIORITYR);
+
+ if (gic_version() == 2)
+ test_targets(nr_irqs);
}
int main(int argc, char **argv)
diff --git a/lib/arm/asm/gic.h b/lib/arm/asm/gic.h
index a469645..f6dfb90 100644
--- a/lib/arm/asm/gic.h
+++ b/lib/arm/asm/gic.h
@@ -20,6 +20,7 @@
#define GICD_ISACTIVER 0x0300
#define GICD_ICACTIVER 0x0380
#define GICD_IPRIORITYR 0x0400
+#define GICD_ITARGETSR 0x0800
#define GICD_SGIR 0x0f00
#define GICD_ICPIDR2 0x0fe8
--
2.14.4
