linux-kernel - [PATCH v7 07/24] iommu/vt-d: Rework prepare_irte() to support per-interrupt delivery mode

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Date:   Wed,  1 Mar 2023 15:47:36 -0800
From:   Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To:     Tony Luck <tony.luck@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Len Brown <len.brown@...el.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Ricardo Neri <ricardo.neri@...el.com>,
        linuxppc-dev@...ts.ozlabs.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>, x86@...nel.org
Subject: [PATCH v7 07/24] iommu/vt-d: Rework prepare_irte() to support per-interrupt delivery mode

struct irq_cfg::delivery_mode specifies the delivery mode of each interrupt
separately. Configuring the delivery mode of an IRTE would require adding
a third argument to prepare_irte(). Instead, take a pointer to the irq_cfg
for which an IRTE is being configured. No functional changes.

Cc: Andi Kleen <ak@...ux.intel.com>
Cc: David Woodhouse <dwmw2@...radead.org>
Cc: "Ravi V. Shankar" <ravi.v.shankar@...el.com>
Cc: Lu Baolu <baolu.lu@...ux.intel.com>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: iommu@...ts.linux-foundation.org
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: x86@...nel.org
Reviewed-by: Ashok Raj <ashok.raj@...el.com>
Reviewed-by: Tony Luck <tony.luck@...el.com>
Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
---
Changes since v6:
 * None

Changes since v5:
 * Only change the signature of prepare_irte(). A separate patch changes
   the setting of the delivery_mode.

Changes since v4:
 * None

Changes since v3:
 * None

Changes since v2:
 * None

Changes since v1:
 * Introduced this patch.
---
 drivers/iommu/intel/irq_remapping.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/intel/irq_remapping.c b/drivers/iommu/intel/irq_remapping.c
index 2d68f94ae0ee..1fe30c31fcbe 100644
--- a/drivers/iommu/intel/irq_remapping.c
+++ b/drivers/iommu/intel/irq_remapping.c
@@ -1106,7 +1106,7 @@ void intel_irq_remap_add_device(struct dmar_pci_notify_info *info)
 	dev_set_msi_domain(&info->dev->dev, map_dev_to_ir(info->dev));
 }
 
-static void prepare_irte(struct irte *irte, int vector, unsigned int dest)
+static void prepare_irte(struct irte *irte, struct irq_cfg *irq_cfg)
 {
 	memset(irte, 0, sizeof(*irte));
 
@@ -1121,8 +1121,8 @@ static void prepare_irte(struct irte *irte, int vector, unsigned int dest)
 	*/
 	irte->trigger_mode = 0;
 	irte->dlvry_mode = apic->delivery_mode;
-	irte->vector = vector;
-	irte->dest_id = IRTE_DEST(dest);
+	irte->vector = irq_cfg->vector;
+	irte->dest_id = IRTE_DEST(irq_cfg->dest_apicid);
 
 	/*
 	 * When using the destination mode of physical APICID, only the
@@ -1273,8 +1273,7 @@ static void intel_irq_remapping_prepare_irte(struct intel_ir_data *data,
 {
 	struct irte *irte = &data->irte_entry;
 
-	prepare_irte(irte, irq_cfg->vector, irq_cfg->dest_apicid);
-
+	prepare_irte(irte, irq_cfg);
 	switch (info->type) {
 	case X86_IRQ_ALLOC_TYPE_IOAPIC:
 		/* Set source-id of interrupt request */
-- 
2.25.1