Subject: [patch 18/39] PCI/MSI: Move mask and unmask helpers to msi.h

From: Thomas Gleixner <[email-masked]>
Date: Fri, 11 Nov 2022 14:54:43 +0100 (CET)

From: Ahmed S. Darwish <[email-masked]>

The upcoming support for per device MSI interrupt domains needs to share
some of the inline helpers with the MSI implementation.

Move them to the header file.

Signed-off-by: Ahmed S. Darwish <[email-masked]>
Signed-off-by: Thomas Gleixner <[email-masked]>

---
 drivers/pci/msi/msi.c | 61 +--------------------------------------
 drivers/pci/msi/msi.h | 83 +++++++++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 74 insertions(+), 70 deletions(-)
---
diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c
index 160af9f01669..5c310df55d0d 100644
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -16,7 +16,7 @@
 static int pci_msi_enable = 1;
 int pci_msi_ignore_mask;
 
-static noinline void pci_msi_update_mask(struct msi_desc *desc, u32 clear, u32 set)
+void pci_msi_update_mask(struct msi_desc *desc, u32 clear, u32 set)
 {
 	raw_spinlock_t *lock = &to_pci_dev(desc->dev)->msi_lock;
 	unsigned long flags;
@@ -32,65 +32,6 @@ static noinline void pci_msi_update_mask(struct msi_desc *desc, u32 clear, u32 s
 	raw_spin_unlock_irqrestore(lock, flags);
 }
 
-static inline void pci_msi_mask(struct msi_desc *desc, u32 mask)
-{
-	pci_msi_update_mask(desc, 0, mask);
-}
-
-static inline void pci_msi_unmask(struct msi_desc *desc, u32 mask)
-{
-	pci_msi_update_mask(desc, mask, 0);
-}
-
-static inline void __iomem *pci_msix_desc_addr(struct msi_desc *desc)
-{
-	return desc->pci.mask_base + desc->msi_index * PCI_MSIX_ENTRY_SIZE;
-}
-
-/*
- * This internal function does not flush PCI writes to the device.  All
- * users must ensure that they read from the device before either assuming
- * that the device state is up to date, or returning out of this file.
- * It does not affect the msi_desc::msix_ctrl cache either. Use with care!
- */
-static void pci_msix_write_vector_ctrl(struct msi_desc *desc, u32 ctrl)
-{
-	void __iomem *desc_addr = pci_msix_desc_addr(desc);
-
-	if (desc->pci.msi_attrib.can_mask)
-		writel(ctrl, desc_addr + PCI_MSIX_ENTRY_VECTOR_CTRL);
-}
-
-static inline void pci_msix_mask(struct msi_desc *desc)
-{
-	desc->pci.msix_ctrl |= PCI_MSIX_ENTRY_CTRL_MASKBIT;
-	pci_msix_write_vector_ctrl(desc, desc->pci.msix_ctrl);
-	/* Flush write to device */
-	readl(desc->pci.mask_base);
-}
-
-static inline void pci_msix_unmask(struct msi_desc *desc)
-{
-	desc->pci.msix_ctrl &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
-	pci_msix_write_vector_ctrl(desc, desc->pci.msix_ctrl);
-}
-
-static void __pci_msi_mask_desc(struct msi_desc *desc, u32 mask)
-{
-	if (desc->pci.msi_attrib.is_msix)
-		pci_msix_mask(desc);
-	else
-		pci_msi_mask(desc, mask);
-}
-
-static void __pci_msi_unmask_desc(struct msi_desc *desc, u32 mask)
-{
-	if (desc->pci.msi_attrib.is_msix)
-		pci_msix_unmask(desc);
-	else
-		pci_msi_unmask(desc, mask);
-}
-
 /**
  * pci_msi_mask_irq - Generic IRQ chip callback to mask PCI/MSI interrupts
  * @data:	pointer to irqdata associated to that interrupt
diff --git a/drivers/pci/msi/msi.h b/drivers/pci/msi/msi.h
index fc92603b33e1..d8f62d911f08 100644
--- a/drivers/pci/msi/msi.h
+++ b/drivers/pci/msi/msi.h
@@ -8,21 +8,67 @@
 int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
 void pci_msi_teardown_msi_irqs(struct pci_dev *dev);
 
-#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
-int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
-void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev);
-#else
-static inline int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+/* Mask/unmask helpers */
+void pci_msi_update_mask(struct msi_desc *desc, u32 clear, u32 set);
+
+static inline void pci_msi_mask(struct msi_desc *desc, u32 mask)
 {
-	WARN_ON_ONCE(1);
-	return -ENODEV;
+	pci_msi_update_mask(desc, 0, mask);
 }
 
-static inline void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev)
+static inline void pci_msi_unmask(struct msi_desc *desc, u32 mask)
 {
-	WARN_ON_ONCE(1);
+	pci_msi_update_mask(desc, mask, 0);
+}
+
+static inline void __iomem *pci_msix_desc_addr(struct msi_desc *desc)
+{
+	return desc->pci.mask_base + desc->msi_index * PCI_MSIX_ENTRY_SIZE;
+}
+
+/*
+ * This internal function does not flush PCI writes to the device.  All
+ * users must ensure that they read from the device before either assuming
+ * that the device state is up to date, or returning out of this file.
+ * It does not affect the msi_desc::msix_ctrl cache either. Use with care!
+ */
+static inline void pci_msix_write_vector_ctrl(struct msi_desc *desc, u32 ctrl)
+{
+	void __iomem *desc_addr = pci_msix_desc_addr(desc);
+
+	if (desc->pci.msi_attrib.can_mask)
+		writel(ctrl, desc_addr + PCI_MSIX_ENTRY_VECTOR_CTRL);
+}
+
+static inline void pci_msix_mask(struct msi_desc *desc)
+{
+	desc->pci.msix_ctrl |= PCI_MSIX_ENTRY_CTRL_MASKBIT;
+	pci_msix_write_vector_ctrl(desc, desc->pci.msix_ctrl);
+	/* Flush write to device */
+	readl(desc->pci.mask_base);
+}
+
+static inline void pci_msix_unmask(struct msi_desc *desc)
+{
+	desc->pci.msix_ctrl &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
+	pci_msix_write_vector_ctrl(desc, desc->pci.msix_ctrl);
+}
+
+static inline void __pci_msi_mask_desc(struct msi_desc *desc, u32 mask)
+{
+	if (desc->pci.msi_attrib.is_msix)
+		pci_msix_mask(desc);
+	else
+		pci_msi_mask(desc, mask);
+}
+
+static inline void __pci_msi_unmask_desc(struct msi_desc *desc, u32 mask)
+{
+	if (desc->pci.msi_attrib.is_msix)
+		pci_msix_unmask(desc);
+	else
+		pci_msi_unmask(desc, mask);
 }
-#endif
 
 /*
  * PCI 2.3 does not specify mask bits for each MSI interrupt.  Attempting to
@@ -37,3 +83,20 @@ static inline __attribute_const__ u32 msi_multi_mask(struct msi_desc *desc)
 		return 0xffffffff;
 	return (1 << (1 << desc->pci.msi_attrib.multi_cap)) - 1;
 }
+
+/* Legacy (!IRQDOMAIN) fallbacks */
+#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
+int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
+void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev);
+#else
+static inline int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+{
+	WARN_ON_ONCE(1);
+	return -ENODEV;
+}
+
+static inline void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev)
+{
+	WARN_ON_ONCE(1);
+}
+#endif