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Thu, 10 Nov 2016 17:21:52 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [kvm-unit-tests PATCH v5 10/11] arm/arm64: gicv3: add an IPI test X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, marc.zyngier@arm.com, andre.przywara@arm.com, eric.auger@redhat.com, pbonzini@redhat.com, alex.bennee@linaro.org, christoffer.dall@linaro.org Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Andrew Jones --- v5: - fix copy+paste error in gicv3_write_eoir [drew] - use modern register names [Andre] 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(-) -- 2.7.4 diff --git a/arm/gic.c b/arm/gic.c index 06092aec7c08..ca68f8ad1cb9 100644 --- a/arm/gic.c +++ b/arm/gic.c @@ -3,6 +3,8 @@ * * GICv2 * + test sending/receiving IPIs + * GICv3 + * + test sending/receiving IPIs * * Copyright (C) 2016, Red Hat Inc, Andrew Jones * @@ -16,6 +18,19 @@ #include #include +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() + GICC_IAR); +} + +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() + GICC_EOIR); +} + +static u32 gicv3_irqnr(u32 iar) +{ + return iar; +} + static void ipi_handler(struct pt_regs *regs __unused) { - u32 irqstat = readl(gicv2_cpu_base() + GICC_IAR); - 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() + GICC_EOIR); + 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() + 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); +} + +static void gicv2_ipi_send_broadcast(void) +{ + writel(1 << 24, gicv2_dist_base() + GICD_SGIR); +} + +#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() + GICD_SGIR); + 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() + GICD_SGIR); + 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() + GICD_SGIR); + 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"); diff --git a/arm/unittests.cfg b/arm/unittests.cfg index 68bf5cd6008f..ce3cee73c4bf 100644 --- a/arm/unittests.cfg +++ b/arm/unittests.cfg @@ -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 diff --git a/lib/arm/asm/arch_gicv3.h b/lib/arm/asm/arch_gicv3.h index 81a1e5f6c29c..615a3393e439 100644 --- a/lib/arm/asm/arch_gicv3.h +++ b/lib/arm/asm/arch_gicv3.h @@ -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" (irq)); + 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); diff --git a/lib/arm64/asm/arch_gicv3.h b/lib/arm64/asm/arch_gicv3.h index 6d353567f56a..874775828016 100644 --- a/lib/arm64/asm/arch_gicv3.h +++ b/lib/arm64/asm/arch_gicv3.h @@ -10,6 +10,9 @@ #include +#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__ */