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iommu, x86: Implement irq_set_vcpu_affinity for intel_ir_chip

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Interrupt chip callback to set the VCPU affinity for posted interrupts.

[ tglx: Use the helper function to copy from the remap irte instead of
        open coding it. Massage the comment as well ]

Signed-off-by: Feng Wu <feng.wu@intel.com>
Reviewed-by: Jiang Liu <jiang.liu@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: iommu@lists.linux-foundation.org
Cc: joro@8bytes.org
Cc: dwmw2@infradead.org
Link: http://lkml.kernel.org/r/1433827237-3382-5-git-send-email-feng.wu@intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Feng Wu 2015-06-09 13:20:31 +08:00 committed by Thomas Gleixner
parent bf56027ff4
commit 8541186faf
2 changed files with 42 additions and 0 deletions
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5
arch/x86/include/asm/irq_remapping.h
View file

@ -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) { }

37
drivers/iommu/intel_irq_remapping.c
View file

@ -1013,10 +1013,47 @@ 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 *info)
{
struct intel_ir_data *ir_data = data->chip_data;
struct vcpu_data *vcpu_pi_info = info;
/* stop posting interrupts, back to remapping mode */
if (!vcpu_pi_info) {
modify_irte(&ir_data->irq_2_iommu, &ir_data->irte_entry);
} else {
struct irte irte_pi;
/*
* We are not caching the posted interrupt entry. We
* copy the data from the remapped entry and modify
* the fields which are relevant for posted mode. The
* cached remapped entry is used for switching back to
* remapped mode.
*/
memset(&irte_pi, 0, sizeof(irte_pi));
dmar_copy_shared_irte(&irte_pi, &ir_data->irte_entry);
/* Update the posted mode fields */
irte_pi.p_pst = 1;
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);
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,