Subject: [RFC Part4 v1 07/17] x86, irq: Implement irq_chip.irq_write_msi_msg for MSI/DMAR/HPET irq_chips

From: [email-masked] (Jiang Liu)
Date: Sun, 9 Nov 2014 23:10:29 +0800

Implement irq_chip.irq_write_msi_msg for MSI/DMAR/HPET irq_chips, they
will be used to share common code later.

Signed-off-by: Jiang Liu <[email-masked]>
---
 arch/x86/kernel/apic/msi.c |   14 ++++++++++++++
 drivers/pci/msi.c          |   15 +++++++++++++--
 include/linux/msi.h        |    1 +
 3 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index 0b2261fe6adf..842d71699912 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -65,6 +65,7 @@ static struct irq_chip msi_chip = {
 	.irq_set_affinity	= msi_domain_set_affinity,
 	.irq_retrigger		= irq_chip_retrigger_hierarchy,
 	.irq_compose_msi_msg	= msi_compose_msg,
+	.irq_write_msi_msg	= pci_msi_write_msg,
 	.flags			= IRQCHIP_SKIP_SET_WAKE,
 };
 
@@ -128,6 +129,7 @@ static struct irq_chip msi_ir_chip = {
 	.irq_ack		= irq_chip_ack_parent,
 	.irq_set_affinity	= msi_domain_set_affinity,
 	.irq_retrigger		= irq_chip_retrigger_hierarchy,
+	.irq_write_msi_msg	= pci_msi_write_msg,
 	.flags			= IRQCHIP_SKIP_SET_WAKE,
 };
 
@@ -155,6 +157,11 @@ dmar_msi_set_affinity(struct irq_data *data, const struct cpumask *mask,
 	return ret;
 }
 
+static void dmar_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
+{
+	dmar_msi_write(data->irq, msg);
+}
+
 static struct irq_chip dmar_msi_type = {
 	.name			= "DMAR-MSI",
 	.irq_unmask		= dmar_msi_unmask,
@@ -163,6 +170,7 @@ static struct irq_chip dmar_msi_type = {
 	.irq_set_affinity	= dmar_msi_set_affinity,
 	.irq_retrigger		= irq_chip_retrigger_hierarchy,
 	.irq_compose_msi_msg	= msi_compose_msg,
+	.irq_write_msi_msg	= dmar_msi_write_msg,
 	.flags			= IRQCHIP_SKIP_SET_WAKE,
 };
 
@@ -285,6 +293,11 @@ static int hpet_msi_set_affinity(struct irq_data *data,
 	return ret;
 }
 
+static void hpet_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
+{
+	hpet_msi_write(data->handler_data, msg);
+}
+
 static struct irq_chip hpet_msi_type = {
 	.name = "HPET-MSI",
 	.irq_unmask = hpet_msi_unmask,
@@ -293,6 +306,7 @@ static struct irq_chip hpet_msi_type = {
 	.irq_set_affinity = hpet_msi_set_affinity,
 	.irq_retrigger = irq_chip_retrigger_hierarchy,
 	.irq_compose_msi_msg = msi_compose_msg,
+	.irq_write_msi_msg = hpet_msi_write_msg,
 	.flags = IRQCHIP_SKIP_SET_WAKE,
 };
 
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 49a8bd37189d..b811739b43c5 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1117,6 +1117,18 @@ int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
 	return ret;
 }
 
+void pci_msi_write_msg(struct irq_data *irq_data, struct msi_msg *msg)
+{
+	struct msi_desc *desc = irq_data->msi_desc;
+
+	/*
+	 * MSI-X message is written per-IRQ.
+	 * MSI message denotes a contiguous group of IRQs, written for 0th IRQ.
+	 */
+	if (desc->irq == irq_data->irq)
+		__write_msi_msg(desc, msg);
+}
+
 /*
  * Generate a unique ID number for each possible MSI source, the ID number
  * is only used within the irqdomain.
@@ -1144,8 +1156,7 @@ static int msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
 
 	for (i = 0; i < nr_irqs; i++) {
 		irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
-					      domain->host_data,
-					      (void *)(long)i);
+					      domain->host_data, NULL);
 		__irq_set_handler(virq + i, handle_edge_irq, 0, "edge");
 	}
 
diff --git a/include/linux/msi.h b/include/linux/msi.h
index daea96489a39..312197f64070 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -84,6 +84,7 @@ int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
 struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
 					 struct irq_chip *chip,
 					 struct irq_domain *parent);
+void pci_msi_write_msg(struct irq_data *irq_data, struct msi_msg *msg);
 int msi_irq_domain_alloc_irqs(struct irq_domain *domain, int type,
 			      struct pci_dev *dev, void *arg);
 
-- 
1.7.10.4