x86, MSI: pass irq_cfg and irq_desc

Impact: simplify code

Pass irq_desc and cfg around, instead of raw IRQ numbers - this way
we dont have to look it up again and again.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

drivers/pci/msi.c

@@ -103,11 +103,11 @@ static void msix_set_enable(struct pci_dev *dev, int enable)
 	}
 }
 
-static void msix_flush_writes(unsigned int irq)
+static void msix_flush_writes(struct irq_desc *desc)
 {
 	struct msi_desc *entry;
 
-	entry = get_irq_msi(irq);
+	entry = get_irq_desc_msi(desc);
 	BUG_ON(!entry || !entry->dev);
 	switch (entry->msi_attrib.type) {
 	case PCI_CAP_ID_MSI:
@@ -135,11 +135,11 @@ static void msix_flush_writes(unsigned int irq)
  * Returns 1 if it succeeded in masking the interrupt and 0 if the device
  * doesn't support MSI masking.
  */
-static int msi_set_mask_bits(unsigned int irq, u32 mask, u32 flag)
+static int msi_set_mask_bits(struct irq_desc *desc, u32 mask, u32 flag)
 {
 	struct msi_desc *entry;
 
-	entry = get_irq_msi(irq);
+	entry = get_irq_desc_msi(desc);
 	BUG_ON(!entry || !entry->dev);
 	switch (entry->msi_attrib.type) {
 	case PCI_CAP_ID_MSI:
@@ -172,9 +172,9 @@ static int msi_set_mask_bits(unsigned int irq, u32 mask, u32 flag)
 	return 1;
 }
 
-void read_msi_msg(unsigned int irq, struct msi_msg *msg)
+void read_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg)
 {
-	struct msi_desc *entry = get_irq_msi(irq);
+	struct msi_desc *entry = get_irq_desc_msi(desc);
 	switch(entry->msi_attrib.type) {
 	case PCI_CAP_ID_MSI:
 	{
@@ -211,9 +211,16 @@ void read_msi_msg(unsigned int irq, struct msi_msg *msg)
 	}
 }
 
-void write_msi_msg(unsigned int irq, struct msi_msg *msg)
+void read_msi_msg(unsigned int irq, struct msi_msg *msg)
 {
-	struct msi_desc *entry = get_irq_msi(irq);
+	struct irq_desc *desc = irq_to_desc(irq);
+
+	read_msi_msg_desc(desc, msg);
+}
+
+void write_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg)
+{
+	struct msi_desc *entry = get_irq_desc_msi(desc);
 	switch (entry->msi_attrib.type) {
 	case PCI_CAP_ID_MSI:
 	{
@@ -252,21 +259,31 @@ void write_msi_msg(unsigned int irq, struct msi_msg *msg)
 	entry->msg = *msg;
 }
 
+void write_msi_msg(unsigned int irq, struct msi_msg *msg)
+{
+	struct irq_desc *desc = irq_to_desc(irq);
+
+	write_msi_msg_desc(desc, msg);
+}
+
 void mask_msi_irq(unsigned int irq)
 {
-	msi_set_mask_bits(irq, 1, 1);
-	msix_flush_writes(irq);
+	struct irq_desc *desc = irq_to_desc(irq);
+
+	msi_set_mask_bits(desc, 1, 1);
+	msix_flush_writes(desc);
 }
 
 void unmask_msi_irq(unsigned int irq)
 {
-	msi_set_mask_bits(irq, 1, 0);
-	msix_flush_writes(irq);
+	struct irq_desc *desc = irq_to_desc(irq);
+
+	msi_set_mask_bits(desc, 1, 0);
+	msix_flush_writes(desc);
 }
 
 static int msi_free_irqs(struct pci_dev* dev);
 
-
 static struct msi_desc* alloc_msi_entry(void)
 {
 	struct msi_desc *entry;
@@ -303,9 +320,11 @@ static void __pci_restore_msi_state(struct pci_dev *dev)
 	pci_intx_for_msi(dev, 0);
 	msi_set_enable(dev, 0);
 	write_msi_msg(dev->irq, &entry->msg);
-	if (entry->msi_attrib.maskbit)
-		msi_set_mask_bits(dev->irq, entry->msi_attrib.maskbits_mask,
+	if (entry->msi_attrib.maskbit) {
+		struct irq_desc *desc = irq_to_desc(dev->irq);
+		msi_set_mask_bits(desc, entry->msi_attrib.maskbits_mask,
 				  entry->msi_attrib.masked);
+	}
 
 	pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control);
 	control &= ~PCI_MSI_FLAGS_QSIZE;
@@ -327,8 +346,9 @@ static void __pci_restore_msix_state(struct pci_dev *dev)
 	msix_set_enable(dev, 0);
 
 	list_for_each_entry(entry, &dev->msi_list, list) {
+		struct irq_desc *desc = irq_to_desc(entry->irq);
 		write_msi_msg(entry->irq, &entry->msg);
-		msi_set_mask_bits(entry->irq, 1, entry->msi_attrib.masked);
+		msi_set_mask_bits(desc, 1, entry->msi_attrib.masked);
 	}
 
 	BUG_ON(list_empty(&dev->msi_list));
@@ -596,7 +616,8 @@ void pci_msi_shutdown(struct pci_dev* dev)
 	/* Return the the pci reset with msi irqs unmasked */
 	if (entry->msi_attrib.maskbit) {
 		u32 mask = entry->msi_attrib.maskbits_mask;
-		msi_set_mask_bits(dev->irq, mask, ~mask);
+		struct irq_desc *desc = irq_to_desc(dev->irq);
+		msi_set_mask_bits(desc, mask, ~mask);
 	}
 	if (!entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI)
 		return;

include/linux/msi.h

@@ -10,8 +10,11 @@ struct msi_msg {
 };
 
 /* Helper functions */
+struct irq_desc;
 extern void mask_msi_irq(unsigned int irq);
 extern void unmask_msi_irq(unsigned int irq);
+extern void read_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg);
+extern void write_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg);
 extern void read_msi_msg(unsigned int irq, struct msi_msg *msg);
 extern void write_msi_msg(unsigned int irq, struct msi_msg *msg);