From: Xiang Chen chenxiang66@hisilicon.com

virt inclusion category: other bugzilla: https://gitee.com/openeuler/kernel/issues/I9SGLA

------------------------------------------------------------------

For gicv4.0 of hip09, it has a soc bug with vPE schedule: when multiple vPEs are sending vpe schedule/deschedule commands concurrently and repeatly, some vPE schedule command may not be scheduled, and it will cause the command timeout. To avoid the issue, limit the number of vLPI to 4096 for virtual machine.

Signed-off-by: Xiang Chen chenxiang66@hisilicon.com Signed-off-by: caijian caijian11@h-partners.com --- arch/arm64/kvm/vgic/vgic-init.c | 1 + arch/arm64/kvm/vgic/vgic-mmio-v3.c | 5 +++++ arch/arm64/kvm/vgic/vgic-mmio.h | 2 ++ drivers/irqchip/irq-gic-v3.c | 20 ++++++++++++++++++++ include/kvm/arm_vgic.h | 1 + include/linux/irqchip/arm-gic-common.h | 1 + include/linux/irqchip/arm-gic-v3.h | 2 ++ 7 files changed, 32 insertions(+)

diff --git a/arch/arm64/kvm/vgic/vgic-init.c b/arch/arm64/kvm/vgic/vgic-init.c index e711c878e563..d38c1d513768 100644 --- a/arch/arm64/kvm/vgic/vgic-init.c +++ b/arch/arm64/kvm/vgic/vgic-init.c @@ -522,6 +522,7 @@ int kvm_vgic_hyp_init(void) return -ENXIO; }

+ kvm_vgic_global_state.flags = gic_kvm_info->flags; switch (gic_kvm_info->type) { case GIC_V2: ret = vgic_v2_probe(gic_kvm_info); diff --git a/arch/arm64/kvm/vgic/vgic-mmio-v3.c b/arch/arm64/kvm/vgic/vgic-mmio-v3.c index 8b90e2cde9b9..bfaa3a452565 100644 --- a/arch/arm64/kvm/vgic/vgic-mmio-v3.c +++ b/arch/arm64/kvm/vgic/vgic-mmio-v3.c @@ -81,6 +81,11 @@ static unsigned long vgic_mmio_read_v3_misc(struct kvm_vcpu *vcpu, if (vgic_has_its(vcpu->kvm)) { value |= (INTERRUPT_ID_BITS_ITS - 1) << 19; value |= GICD_TYPER_LPIS; + /* Limit the number of vlpis to 4096 */ + if (kvm_vgic_global_state.flags & + FLAGS_WORKAROUND_HIP09_ERRATUM_162200803) + value |= 11 << GICD_TYPER_NUM_LPIS_SHIFT; + } else { value |= (INTERRUPT_ID_BITS_SPIS - 1) << 19; } diff --git a/arch/arm64/kvm/vgic/vgic-mmio.h b/arch/arm64/kvm/vgic/vgic-mmio.h index dcea44015985..7de51e059698 100644 --- a/arch/arm64/kvm/vgic/vgic-mmio.h +++ b/arch/arm64/kvm/vgic/vgic-mmio.h @@ -5,6 +5,8 @@ #ifndef __KVM_ARM_VGIC_MMIO_H__ #define __KVM_ARM_VGIC_MMIO_H__

+#define FLAGS_WORKAROUND_HIP09_ERRATUM_162200803 (1ULL << 4) + struct vgic_register_region { unsigned int reg_offset; unsigned int len; diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c index ebb22a443f1d..5371a8d8e027 100644 --- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -36,6 +36,7 @@ #define FLAGS_WORKAROUND_GICR_WAKER_MSM8996 (1ULL << 0) #define FLAGS_WORKAROUND_CAVIUM_ERRATUM_38539 (1ULL << 1) #define FLAGS_WORKAROUND_MTK_GICR_SAVE (1ULL << 2) +#define FLAGS_WORKAROUND_HIP09_ERRATUM_162200803 (1ULL << 4)

#define GIC_IRQ_TYPE_PARTITION (GIC_IRQ_TYPE_LPI + 1)

@@ -1700,6 +1701,15 @@ static bool gic_enable_quirk_hip06_07(void *data) return false; }

+static bool gic_enable_quirk_hip09_162200803(void *data) +{ + struct gic_chip_data *d = data; + + d->flags |= FLAGS_WORKAROUND_HIP09_ERRATUM_162200803; + + return true; +} + static const struct gic_quirk gic_quirks[] = { { .desc = "GICv3: Qualcomm MSM8996 broken firmware", @@ -1736,6 +1746,12 @@ static const struct gic_quirk gic_quirks[] = { .mask = 0xe8f00fff, .init = gic_enable_quirk_cavium_38539, }, + { + .desc = "GICv3: HIP09 erratum 162200803", + .iidr = 0x01050736, + .mask = 0xffffffff, + .init = gic_enable_quirk_hip09_162200803, + }, { } }; @@ -2036,6 +2052,8 @@ static void __init gic_of_setup_kvm_info(struct device_node *node) gic_v3_kvm_info.has_v4 = gic_data.rdists.has_vlpis; gic_v3_kvm_info.has_v4_1 = gic_data.rdists.has_rvpeid; gic_v3_kvm_info.has_vtimer = gic_data.rdists.has_vtimer; + if (gic_v3_kvm_info.has_v4 && !gic_v3_kvm_info.has_v4_1) + gic_v3_kvm_info.flags = gic_data.flags; gic_set_kvm_info(&gic_v3_kvm_info); }

@@ -2353,6 +2371,8 @@ static void __init gic_acpi_setup_kvm_info(void) gic_v3_kvm_info.has_v4 = gic_data.rdists.has_vlpis; gic_v3_kvm_info.has_v4_1 = gic_data.rdists.has_rvpeid; gic_v3_kvm_info.has_vtimer = gic_data.rdists.has_vtimer; + if (gic_v3_kvm_info.has_v4 && !gic_v3_kvm_info.has_v4_1) + gic_v3_kvm_info.flags = gic_data.flags; gic_set_kvm_info(&gic_v3_kvm_info); }

diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index b402e064ff3b..1d987bf1e70a 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -110,6 +110,7 @@ struct vgic_global { struct static_key_false gicv3_cpuif;

u32 ich_vtr_el2; + u64 flags; };

extern struct vgic_global kvm_vgic_global_state; diff --git a/include/linux/irqchip/arm-gic-common.h b/include/linux/irqchip/arm-gic-common.h index 9b2c86a09a47..9ace08bb15ba 100644 --- a/include/linux/irqchip/arm-gic-common.h +++ b/include/linux/irqchip/arm-gic-common.h @@ -37,6 +37,7 @@ struct gic_kvm_info { /* vtimer irqbypass support */ bool has_vtimer;

+ u64 flags; };

const struct gic_kvm_info *gic_get_kvm_info(void); diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h index e5c5b05c9c5a..88b02e3b81da 100644 --- a/include/linux/irqchip/arm-gic-v3.h +++ b/include/linux/irqchip/arm-gic-v3.h @@ -79,6 +79,8 @@ #define GICD_CTLR_ENABLE_SS_G1 (1U << 1) #define GICD_CTLR_ENABLE_SS_G0 (1U << 0)

+#define GICD_TYPER_NUM_LPIS_SHIFT 11 + #define GICD_TYPER_RSS (1U << 26) #define GICD_TYPER_LPIS (1U << 17) #define GICD_TYPER_MBIS (1U << 16)