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authorSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>2016-08-23 13:52:39 -0500
committerJoerg Roedel <jroedel@suse.de>2016-09-05 12:41:46 +0200
commitb9fc6b56f478b487dc8fc400da73d89ac9137201 (patch)
treef2bd018bb8dbb4a3c8e28bb3106293e221d3169c /drivers/iommu/amd_iommu.c
parent8dbea3fd7becd4af8ca882c3132be4b1a857e301 (diff)
downloadlinux-b9fc6b56f478b487dc8fc400da73d89ac9137201.tar.gz
iommu/amd: Implements irq_set_vcpu_affinity() hook to setup vapic mode for pass-through devices
This patch implements irq_set_vcpu_affinity() function to set up interrupt remapping table entry with vapic mode for pass-through devices. In case requirements for vapic mode are not met, it falls back to set up the IRTE in legacy mode. Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/amd_iommu.c')
-rw-r--r--drivers/iommu/amd_iommu.c68
1 files changed, 64 insertions, 4 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 089e1ed4deec..69fc57e0b975 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3718,7 +3718,8 @@ out:
return index;
}
-static int modify_irte_ga(u16 devid, int index, struct irte_ga *irte)
+static int modify_irte_ga(u16 devid, int index, struct irte_ga *irte,
+ struct amd_ir_data *data)
{
struct irq_remap_table *table;
struct amd_iommu *iommu;
@@ -3741,6 +3742,8 @@ static int modify_irte_ga(u16 devid, int index, struct irte_ga *irte)
entry->hi.val = irte->hi.val;
entry->lo.val = irte->lo.val;
entry->lo.fields_remap.valid = 1;
+ if (data)
+ data->ref = entry;
spin_unlock_irqrestore(&table->lock, flags);
@@ -3839,7 +3842,7 @@ static void irte_ga_activate(void *entry, u16 devid, u16 index)
struct irte_ga *irte = (struct irte_ga *) entry;
irte->lo.fields_remap.valid = 1;
- modify_irte_ga(devid, index, irte);
+ modify_irte_ga(devid, index, irte, NULL);
}
static void irte_deactivate(void *entry, u16 devid, u16 index)
@@ -3855,7 +3858,7 @@ static void irte_ga_deactivate(void *entry, u16 devid, u16 index)
struct irte_ga *irte = (struct irte_ga *) entry;
irte->lo.fields_remap.valid = 0;
- modify_irte_ga(devid, index, irte);
+ modify_irte_ga(devid, index, irte, NULL);
}
static void irte_set_affinity(void *entry, u16 devid, u16 index,
@@ -3876,7 +3879,7 @@ static void irte_ga_set_affinity(void *entry, u16 devid, u16 index,
irte->hi.fields.vector = vector;
irte->lo.fields_remap.destination = dest_apicid;
irte->lo.fields_remap.guest_mode = 0;
- modify_irte_ga(devid, index, irte);
+ modify_irte_ga(devid, index, irte, NULL);
}
#define IRTE_ALLOCATED (~1U)
@@ -4211,6 +4214,62 @@ static struct irq_domain_ops amd_ir_domain_ops = {
.deactivate = irq_remapping_deactivate,
};
+static int amd_ir_set_vcpu_affinity(struct irq_data *data, void *vcpu_info)
+{
+ struct amd_iommu *iommu;
+ struct amd_iommu_pi_data *pi_data = vcpu_info;
+ struct vcpu_data *vcpu_pi_info = pi_data->vcpu_data;
+ struct amd_ir_data *ir_data = data->chip_data;
+ struct irte_ga *irte = (struct irte_ga *) ir_data->entry;
+ struct irq_2_irte *irte_info = &ir_data->irq_2_irte;
+
+ pi_data->ir_data = ir_data;
+
+ /* Note:
+ * SVM tries to set up for VAPIC mode, but we are in
+ * legacy mode. So, we force legacy mode instead.
+ */
+ if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)) {
+ pr_debug("AMD-Vi: %s: Fall back to using intr legacy remap\n",
+ __func__);
+ pi_data->is_guest_mode = false;
+ }
+
+ iommu = amd_iommu_rlookup_table[irte_info->devid];
+ if (iommu == NULL)
+ return -EINVAL;
+
+ pi_data->prev_ga_tag = ir_data->cached_ga_tag;
+ if (pi_data->is_guest_mode) {
+ /* Setting */
+ irte->hi.fields.ga_root_ptr = (pi_data->base >> 12);
+ irte->hi.fields.vector = vcpu_pi_info->vector;
+ irte->lo.fields_vapic.guest_mode = 1;
+ irte->lo.fields_vapic.ga_tag = pi_data->ga_tag;
+
+ ir_data->cached_ga_tag = pi_data->ga_tag;
+ } else {
+ /* Un-Setting */
+ struct irq_cfg *cfg = irqd_cfg(data);
+
+ irte->hi.val = 0;
+ irte->lo.val = 0;
+ irte->hi.fields.vector = cfg->vector;
+ irte->lo.fields_remap.guest_mode = 0;
+ irte->lo.fields_remap.destination = cfg->dest_apicid;
+ irte->lo.fields_remap.int_type = apic->irq_delivery_mode;
+ irte->lo.fields_remap.dm = apic->irq_dest_mode;
+
+ /*
+ * This communicates the ga_tag back to the caller
+ * so that it can do all the necessary clean up.
+ */
+ ir_data->cached_ga_tag = 0;
+ }
+
+ return modify_irte_ga(irte_info->devid, irte_info->index, irte, ir_data);
+}
+
static int amd_ir_set_affinity(struct irq_data *data,
const struct cpumask *mask, bool force)
{
@@ -4255,6 +4314,7 @@ static void ir_compose_msi_msg(struct irq_data *irq_data, struct msi_msg *msg)
static struct irq_chip amd_ir_chip = {
.irq_ack = ir_ack_apic_edge,
.irq_set_affinity = amd_ir_set_affinity,
+ .irq_set_vcpu_affinity = amd_ir_set_vcpu_affinity,
.irq_compose_msi_msg = ir_compose_msi_msg,
};