[patch 27/39] PCI/MSI: Move pci_disable_msix() to api.c

Thomas Gleixner
2022-11-11T13:57:22Z

From: Ahmed S. Darwish <darwi@linutronix.de>

To distangle the maze in msi.c, all exported device-driver MSI APIs are
now to be grouped in one file, api.c.

Move pci_disable_msix() and make its kernel-doc comprehensive.

Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
drivers/pci/msi/api.c | 24 ++++++++++++++++++++++++
drivers/pci/msi/msi.c | 14 +-------------
drivers/pci/msi/msi.h | 1 +
3 files changed, 26 insertions(+), 13 deletions(-)
---
diff --git a/drivers/pci/msi/api.c b/drivers/pci/msi/api.c
index 83ea38ffa116..653a61868ae6 100644
--- a/drivers/pci/msi/api.c
+++ b/drivers/pci/msi/api.c
@@ -112,6 +112,30 @@ int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
EXPORT_SYMBOL(pci_enable_msix_range);

/**
+ * pci_disable_msix() - Disable MSI-X interrupt mode on device
+ * @dev: the PCI device to operate on
+ *
+ * Legacy device driver API to disable MSI-X interrupt mode on device,
+ * free earlier-allocated interrupt vectors, and restore INTx emulation.
+ * The PCI device Linux IRQ (@dev->irq) is restored to its default pin
+ * assertion IRQ. This is the cleanup pair of pci_enable_msix_range().
+ *
+ * NOTE: The newer pci_alloc_irq_vectors() / pci_free_irq_vectors() API
+ * pair should, in general, be used instead.
+ */
+void pci_disable_msix(struct pci_dev *dev)
+{
+ if (!pci_msi_enabled() || !dev || !dev->msix_enabled)
+ return;
+
+ msi_lock_descs(&dev->dev);
+ pci_msix_shutdown(dev);
+ pci_free_msi_irqs(dev);
+ msi_unlock_descs(&dev->dev);
+}
+EXPORT_SYMBOL(pci_disable_msix);
+
+/**
* pci_alloc_irq_vectors() - Allocate multiple device interrupt vectors
* @dev: the PCI device to operate on
* @min_vecs: minimum required number of vectors (must be >= 1)
diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c
index 1226d66da992..6fa90d07d2e4 100644
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -736,7 +736,7 @@ static int __pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries,
return msix_capability_init(dev, entries, nvec, affd);
}

-static void pci_msix_shutdown(struct pci_dev *dev)
+void pci_msix_shutdown(struct pci_dev *dev)
{
struct msi_desc *desc;

@@ -758,18 +758,6 @@ static void pci_msix_shutdown(struct pci_dev *dev)
pcibios_alloc_irq(dev);
}

-void pci_disable_msix(struct pci_dev *dev)
-{
- if (!pci_msi_enable || !dev || !dev->msix_enabled)
- return;
-
- msi_lock_descs(&dev->dev);
- pci_msix_shutdown(dev);
- pci_free_msi_irqs(dev);
- msi_unlock_descs(&dev->dev);
-}
-EXPORT_SYMBOL(pci_disable_msix);
-
int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
struct irq_affinity *affd)
{
diff --git a/drivers/pci/msi/msi.h b/drivers/pci/msi/msi.h
index 8c4a5289432d..77e2587f7e4f 100644
--- a/drivers/pci/msi/msi.h
+++ b/drivers/pci/msi/msi.h
@@ -86,6 +86,7 @@ static inline __attribute_const__ u32 msi_multi_mask(struct msi_desc *desc)

/* MSI internal functions invoked from the public APIs */
void pci_msi_shutdown(struct pci_dev *dev);
+void pci_msix_shutdown(struct pci_dev *dev);
void pci_free_msi_irqs(struct pci_dev *dev);
int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec, struct irq_affinity *affd);
int __pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries, int minvec,