@@ -3,6 +3,8 @@
*
* GICv2
* + test sending/receiving IPIs
+ * GICv3
+ * + test sending/receiving IPIs
*
* Copyright (C) 2016, Red Hat Inc, Andrew Jones <drjones@redhat.com>
*
@@ -16,6 +18,19 @@
#include <asm/barrier.h>
#include <asm/io.h>
+struct gic {
+ struct {
+ void (*enable)(void);
+ void (*send_self)(void);
+ void (*send_tlist)(cpumask_t *);
+ void (*send_broadcast)(void);
+ } ipi;
+ u32 (*read_iar)(void);
+ u32 (*irqnr)(u32 iar);
+ void (*write_eoi)(u32);
+};
+
+static struct gic *gic;
static int gic_version;
static int acked[NR_CPUS], spurious[NR_CPUS];
static cpumask_t ready;
@@ -69,13 +84,33 @@ static void check_acked(cpumask_t *mask)
false, missing, extra, unexpected);
}
+static u32 gicv2_read_iar(void)
+{
+ return readl(gicv2_cpu_base() + GIC_CPU_INTACK);
+}
+
+static u32 gicv2_irqnr(u32 iar)
+{
+ return iar & GICC_IAR_INT_ID_MASK;
+}
+
+static void gicv2_write_eoi(u32 irqstat)
+{
+ writel(irqstat, gicv2_cpu_base() + GIC_CPU_EOI);
+}
+
+static u32 gicv3_irqnr(u32 iar)
+{
+ return iar;
+}
+
static void ipi_handler(struct pt_regs *regs __unused)
{
- u32 irqstat = readl(gicv2_cpu_base() + GIC_CPU_INTACK);
- u32 irqnr = irqstat & GICC_IAR_INT_ID_MASK;
+ u32 irqstat = gic->read_iar();
+ u32 irqnr = gic->irqnr(irqstat);
if (irqnr != GICC_INT_SPURIOUS) {
- writel(irqstat, gicv2_cpu_base() + GIC_CPU_EOI);
+ 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 */
@@ -85,6 +120,112 @@ static void ipi_handler(struct pt_regs *regs __unused)
}
}
+static void gicv2_ipi_send_self(void)
+{
+ writel(2 << 24, gicv2_dist_base() + GIC_DIST_SOFTINT);
+}
+
+static void gicv2_ipi_send_tlist(cpumask_t *mask)
+{
+ u8 tlist = (u8)cpumask_bits(mask)[0];
+
+ writel(tlist << 16, gicv2_dist_base() + GIC_DIST_SOFTINT);
+}
+
+static void gicv2_ipi_send_broadcast(void)
+{
+ writel(1 << 24, gicv2_dist_base() + GIC_DIST_SOFTINT);
+}
+
+#define ICC_SGI1R_AFFINITY_1_SHIFT 16
+#define ICC_SGI1R_AFFINITY_2_SHIFT 32
+#define ICC_SGI1R_AFFINITY_3_SHIFT 48
+#define MPIDR_TO_SGI_AFFINITY(cluster_id, level) \
+ (MPIDR_AFFINITY_LEVEL(cluster_id, level) << ICC_SGI1R_AFFINITY_## level ## _SHIFT)
+
+static void gicv3_ipi_send_tlist(cpumask_t *mask)
+{
+ u16 tlist;
+ int cpu;
+
+ /*
+ * For each cpu in the mask collect its peers, which are also in
+ * the mask, in order to form target lists.
+ */
+ for_each_cpu(cpu, mask) {
+ u64 mpidr = cpus[cpu], sgi1r;
+ u64 cluster_id;
+
+ /*
+ * GICv3 can send IPIs to up 16 peer cpus with a single
+ * write to ICC_SGI1R_EL1 (using the target list). Peers
+ * are cpus that have nearly identical MPIDRs, the only
+ * difference being Aff0. The matching upper affinity
+ * levels form the cluster ID.
+ */
+ cluster_id = mpidr & ~0xffUL;
+ tlist = 0;
+
+ /*
+ * Sort of open code for_each_cpu in order to have a
+ * nested for_each_cpu loop.
+ */
+ while (cpu < nr_cpus) {
+ if ((mpidr & 0xff) >= 16) {
+ printf("cpu%d MPIDR:aff0 is %d (>= 16)!\n",
+ cpu, (int)(mpidr & 0xff));
+ break;
+ }
+
+ tlist |= 1 << (mpidr & 0xf);
+
+ cpu = cpumask_next(cpu, mask);
+ if (cpu >= nr_cpus)
+ break;
+
+ mpidr = cpus[cpu];
+
+ if (cluster_id != (mpidr & ~0xffUL)) {
+ /*
+ * The next cpu isn't in our cluster. Roll
+ * back the cpu index allowing the outer
+ * for_each_cpu to find it again with
+ * cpumask_next
+ */
+ --cpu;
+ break;
+ }
+ }
+
+ /* 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 | */
+ MPIDR_TO_SGI_AFFINITY(cluster_id, 1) |
+ tlist);
+
+ gicv3_write_sgi1r(sgi1r);
+ }
+
+ /* Force the above writes to ICC_SGI1R_EL1 to be executed */
+ isb();
+}
+
+static void gicv3_ipi_send_self(void)
+{
+ cpumask_t mask;
+
+ cpumask_clear(&mask);
+ cpumask_set_cpu(smp_processor_id(), &mask);
+ gicv3_ipi_send_tlist(&mask);
+}
+
+static void gicv3_ipi_send_broadcast(void)
+{
+ gicv3_write_sgi1r(1ULL << 40);
+ isb();
+}
+
static void ipi_test_self(void)
{
cpumask_t mask;
@@ -94,7 +235,7 @@ static void ipi_test_self(void)
smp_wmb();
cpumask_clear(&mask);
cpumask_set_cpu(0, &mask);
- writel(2 << 24, gicv2_dist_base() + GIC_DIST_SOFTINT);
+ gic->ipi.send_self();
check_acked(&mask);
report_prefix_pop();
}
@@ -102,14 +243,15 @@ static void ipi_test_self(void)
static void ipi_test_smp(void)
{
cpumask_t mask;
- unsigned long tlist;
+ int i;
report_prefix_push("target-list");
memset(acked, 0, sizeof(acked));
smp_wmb();
- tlist = cpumask_bits(&cpu_present_mask)[0] & 0xaa;
- cpumask_bits(&mask)[0] = tlist;
- writel((u8)tlist << 16, gicv2_dist_base() + GIC_DIST_SOFTINT);
+ cpumask_copy(&mask, &cpu_present_mask);
+ for (i = 0; i < nr_cpus; i += 2)
+ cpumask_clear_cpu(i, &mask);
+ gic->ipi.send_tlist(&mask);
check_acked(&mask);
report_prefix_pop();
@@ -118,14 +260,14 @@ static void ipi_test_smp(void)
smp_wmb();
cpumask_copy(&mask, &cpu_present_mask);
cpumask_clear_cpu(0, &mask);
- writel(1 << 24, gicv2_dist_base() + GIC_DIST_SOFTINT);
+ gic->ipi.send_broadcast();
check_acked(&mask);
report_prefix_pop();
}
static void ipi_enable(void)
{
- gicv2_enable_defaults();
+ gic->ipi.enable();
#ifdef __arm__
install_exception_handler(EXCPTN_IRQ, ipi_handler);
#else
@@ -142,6 +284,30 @@ static void ipi_recv(void)
wfi();
}
+struct gic gicv2 = {
+ .ipi = {
+ .enable = gicv2_enable_defaults,
+ .send_self = gicv2_ipi_send_self,
+ .send_tlist = gicv2_ipi_send_tlist,
+ .send_broadcast = gicv2_ipi_send_broadcast,
+ },
+ .read_iar = gicv2_read_iar,
+ .irqnr = gicv2_irqnr,
+ .write_eoi = gicv2_write_eoi,
+};
+
+struct gic gicv3 = {
+ .ipi = {
+ .enable = gicv3_enable_defaults,
+ .send_self = gicv3_ipi_send_self,
+ .send_tlist = gicv3_ipi_send_tlist,
+ .send_broadcast = gicv3_ipi_send_broadcast,
+ },
+ .read_iar = gicv3_read_iar,
+ .irqnr = gicv3_irqnr,
+ .write_eoi = gicv3_write_eoir,
+};
+
int main(int argc, char **argv)
{
char pfx[8];
@@ -154,6 +320,15 @@ int main(int argc, char **argv)
snprintf(pfx, 8, "gicv%d", gic_version);
report_prefix_push(pfx);
+ switch (gic_version) {
+ case 2:
+ gic = &gicv2;
+ break;
+ case 3:
+ gic = &gicv3;
+ break;
+ }
+
if (argc < 2) {
report_prefix_push("ipi");
@@ -61,3 +61,9 @@ file = gic.flat
smp = $((($MAX_SMP < 8)?$MAX_SMP:8))
extra_params = -machine gic-version=2 -append 'ipi'
groups = gic
+
+[gicv3-ipi]
+file = gic.flat
+smp = $MAX_SMP
+extra_params = -machine gic-version=3 -append 'ipi'
+groups = gic
@@ -16,10 +16,28 @@
#define __stringify xstr
#define __ACCESS_CP15(CRn, Op1, CRm, Op2) p15, Op1, %0, CRn, CRm, Op2
+#define __ACCESS_CP15_64(Op1, CRm) p15, Op1, %Q0, %R0, CRm
+#define ICC_EOIR1 __ACCESS_CP15(c12, 0, c12, 1)
+#define ICC_IAR1 __ACCESS_CP15(c12, 0, c12, 0)
+#define ICC_SGI1R __ACCESS_CP15_64(0, c12)
#define ICC_PMR __ACCESS_CP15(c4, 0, c6, 0)
#define ICC_IGRPEN1 __ACCESS_CP15(c12, 0, c12, 7)
+static inline void gicv3_write_eoir(u32 irq)
+{
+ asm volatile("mcr " __stringify(ICC_EOIR1) : : "r" (val));
+ isb();
+}
+
+static inline u32 gicv3_read_iar(void)
+{
+ u32 irqstat;
+ asm volatile("mrc " __stringify(ICC_IAR1) : "=r" (irqstat));
+ dsb(sy);
+ return irqstat;
+}
+
static inline void gicv3_write_pmr(u32 val)
{
asm volatile("mcr " __stringify(ICC_PMR) : : "r" (val));
@@ -31,6 +49,11 @@ static inline void gicv3_write_grpen1(u32 val)
isb();
}
+static inline void gicv3_write_sgi1r(u64 val)
+{
+ asm volatile("mcrr " __stringify(ICC_SGI1R) : : "r" (val));
+}
+
static inline u64 gicv3_read_typer(const volatile void __iomem *addr)
{
u64 val = readl(addr);
@@ -10,6 +10,9 @@
#include <asm/sysreg.h>
+#define ICC_EOIR1_EL1 sys_reg(3, 0, 12, 12, 1)
+#define ICC_IAR1_EL1 sys_reg(3, 0, 12, 12, 0)
+#define ICC_SGI1R_EL1 sys_reg(3, 0, 12, 11, 5)
#define ICC_PMR_EL1 sys_reg(3, 0, 4, 6, 0)
#define ICC_GRPEN1_EL1 sys_reg(3, 0, 12, 12, 7)
@@ -27,6 +30,20 @@
* sets the GP register's most significant bits to 0 with an explicit cast.
*/
+static inline void gicv3_write_eoir(u32 irq)
+{
+ asm volatile("msr_s " __stringify(ICC_EOIR1_EL1) ", %0" : : "r" ((u64)irq));
+ isb();
+}
+
+static inline u32 gicv3_read_iar(void)
+{
+ u64 irqstat;
+ asm volatile("mrs_s %0, " __stringify(ICC_IAR1_EL1) : "=r" (irqstat));
+ dsb(sy);
+ return (u64)irqstat;
+}
+
static inline void gicv3_write_pmr(u32 val)
{
asm volatile("msr_s " __stringify(ICC_PMR_EL1) ", %0" : : "r" ((u64)val));
@@ -38,6 +55,11 @@ static inline void gicv3_write_grpen1(u32 val)
isb();
}
+static inline void gicv3_write_sgi1r(u64 val)
+{
+ asm volatile("msr_s " __stringify(ICC_SGI1R_EL1) ", %0" : : "r" (val));
+}
+
#define gicv3_read_typer(c) readq(c)
#endif /* __ASSEMBLY__ */
Signed-off-by: Andrew Jones <drjones@redhat.com> --- v4: - heavily comment gicv3_ipi_send_tlist() [Eric] - changes needed for gicv2 iar/irqstat fix to other patch v2: - use IRM for gicv3 broadcast --- arm/gic.c | 195 ++++++++++++++++++++++++++++++++++++++++++--- arm/unittests.cfg | 6 ++ lib/arm/asm/arch_gicv3.h | 23 ++++++ lib/arm64/asm/arch_gicv3.h | 22 +++++ 4 files changed, 236 insertions(+), 10 deletions(-)