diff options
| author | Feng Wu <feng.wu@intel.com> | 2015-06-09 07:20:31 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-06-12 11:33:52 +0200 |
| commit | 8541186faf3b59623c86022cc5f21ce9bd1332c5 (patch) | |
| tree | d56540b54711427141d8e1b7c0f542642d2301c5 /drivers/iommu/intel_irq_remapping.c | |
| parent | iommu: dmar: Provide helper to copy shared irte fields (diff) | |
| download | linux-8541186faf3b59623c86022cc5f21ce9bd1332c5.tar.xz linux-8541186faf3b59623c86022cc5f21ce9bd1332c5.zip | |
iommu, x86: Implement irq_set_vcpu_affinity for intel_ir_chip
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>
Diffstat (limited to 'drivers/iommu/intel_irq_remapping.c')
| -rw-r--r-- | drivers/iommu/intel_irq_remapping.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c index 8fad71cc27e7..a643eecf9d29 100644 --- a/drivers/iommu/intel_irq_remapping.c +++ b/drivers/iommu/intel_irq_remapping.c @@ -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, |