Messages in this thread Patch in this message |  | | From | Feng Wu <> | Subject | [v9 3/9] iommu, x86: Implement irq_set_vcpu_affinity for intel_ir_chip | Date | Fri, 5 Jun 2015 13:42:48 +0800 |
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Implement irq_set_vcpu_affinity for intel_ir_chip.
Signed-off-by: Feng Wu <feng.wu@intel.com> Reviewed-by: Jiang Liu <jiang.liu@linux.intel.com> Acked-by: David Woodhouse <David.Woodhouse@intel.com> --- arch/x86/include/asm/irq_remapping.h | 5 +++++ drivers/iommu/intel_irq_remapping.c | 43 ++++++++++++++++++++++++++++++++++++ 2 files changed, 48 insertions(+)
diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h index 0953723..202e040 100644 --- a/arch/x86/include/asm/irq_remapping.h +++ b/arch/x86/include/asm/irq_remapping.h @@ -57,6 +57,11 @@ static inline struct irq_domain *arch_get_ir_parent_domain(void) return x86_vector_domain; } +struct vcpu_data { + u64 pi_desc_addr; /* Physical address of PI Descriptor */ + u32 vector; /* Guest vector of the interrupt */ +}; + #else /* CONFIG_IRQ_REMAP */ static inline void set_irq_remapping_broken(void) { } diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c index 8fad71c..9bbc235 100644 --- a/drivers/iommu/intel_irq_remapping.c +++ b/drivers/iommu/intel_irq_remapping.c @@ -1013,10 +1013,53 @@ static void intel_ir_compose_msi_msg(struct irq_data *irq_data, *msg = ir_data->msi_entry; } +static int intel_ir_set_vcpu_affinity(struct irq_data *data, void *vcpu_info) +{ + struct intel_ir_data *ir_data = data->chip_data; + struct irte irte_pi; + struct vcpu_data *vcpu_pi_info; + + /* stop posting interrupts, back to remapping mode */ + if (!vcpu_info) { + modify_irte(&ir_data->irq_2_iommu, &ir_data->irte_entry); + } else { + vcpu_pi_info = (struct vcpu_data *)vcpu_info; + + /* + * "ir_data->irte_entry" saves the remapped format of IRTE, + * which being a cached irte is still updated when setting + * the affinity even when we are in posted mode. So this makes + * it possible to switch back to remapped mode from posted mode, + * we can just set "ir_data->irte_entry" to hardware for that + * purpose. + */ + memcpy(&irte_pi, &ir_data->irte_entry, sizeof(struct irte)); + + irte_pi.p_urgent = 0; + irte_pi.p_vector = vcpu_pi_info->vector; + irte_pi.pda_l = (vcpu_pi_info->pi_desc_addr >> + (32 - PDA_LOW_BIT)) & ~(-1UL << PDA_LOW_BIT); + irte_pi.pda_h = (vcpu_pi_info->pi_desc_addr >> 32) & + ~(-1UL << PDA_HIGH_BIT); + + irte_pi.p_res0 = 0; + irte_pi.p_res1 = 0; + irte_pi.p_res2 = 0; + irte_pi.p_res3 = 0; + + irte_pi.p_pst = 1; + + modify_irte(&ir_data->irq_2_iommu, &irte_pi); + } + + return 0; +} + static struct irq_chip intel_ir_chip = { .irq_ack = ir_ack_apic_edge, .irq_set_affinity = intel_ir_set_affinity, .irq_compose_msi_msg = intel_ir_compose_msi_msg, + .irq_set_vcpu_affinity = intel_ir_set_vcpu_affinity, }; static void intel_irq_remapping_prepare_irte(struct intel_ir_data *data, -- 2.1.0
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