[tip: irq/core] PCI/MSI: Move pci_irq_get_affinity() to api.c

tip-bot2 for Ahmed S. Darwish
2022-11-17T15:09:17Z

The following commit has been merged into the irq/core branch of tip:

Commit-ID: be37b8428b7b7740bbbc29c17cfa2ee42b9e2d8b
Gitweb: https://git.kernel.org/tip/be37b8428b7b7740bbbc29c17cfa2ee42b9e2d8b
Author: Ahmed S. Darwish <darwi@linutronix.de>
AuthorDate: Fri, 11 Nov 2022 14:54:59 +01:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Thu, 17 Nov 2022 15:15:21 +01:00

PCI/MSI: Move pci_irq_get_affinity() to api.c

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

Move pci_irq_get_affinity() and let its kernel-doc match rest of the
file.

Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20221111122015.214792769@linutronix.de

---
drivers/pci/msi/api.c | 43 ++++++++++++++++++++++++++++++++++++++++++-
drivers/pci/msi/msi.c | 38 +-------------------------------------
2 files changed, 43 insertions(+), 38 deletions(-)

diff --git a/drivers/pci/msi/api.c b/drivers/pci/msi/api.c
index 20a580b..93ddc55 100644
--- a/drivers/pci/msi/api.c
+++ b/drivers/pci/msi/api.c
@@ -9,6 +9,7 @@
*/

#include <linux/export.h>
+#include <linux/irq.h>

#include "msi.h"

@@ -251,6 +252,48 @@ int pci_irq_vector(struct pci_dev *dev, unsigned int nr)
EXPORT_SYMBOL(pci_irq_vector);

/**
+ * pci_irq_get_affinity() - Get a device interrupt vector affinity
+ * @dev: the PCI device to operate on
+ * @nr: device-relative interrupt vector index (0-based); has different
+ * meanings, depending on interrupt mode
+ * MSI-X the index in the MSI-X vector table
+ * MSI the index of the enabled MSI vectors
+ * INTx must be 0
+ *
+ * Return: MSI/MSI-X vector affinity, NULL if @nr is out of range or if
+ * the MSI(-X) vector was allocated without explicit affinity
+ * requirements (e.g., by pci_enable_msi(), pci_enable_msix_range(), or
+ * pci_alloc_irq_vectors() without the %PCI_IRQ_AFFINITY flag). Return a
+ * generic set of CPU IDs representing all possible CPUs available
+ * during system boot if the device is in legacy INTx mode.
+ */
+const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr)
+{
+ int idx, irq = pci_irq_vector(dev, nr);
+ struct msi_desc *desc;
+
+ if (WARN_ON_ONCE(irq <= 0))
+ return NULL;
+
+ desc = irq_get_msi_desc(irq);
+ /* Non-MSI does not have the information handy */
+ if (!desc)
+ return cpu_possible_mask;
+
+ /* MSI[X] interrupts can be allocated without affinity descriptor */
+ if (!desc->affinity)
+ return NULL;
+
+ /*
+ * MSI has a mask array in the descriptor.
+ * MSI-X has a single mask.
+ */
+ idx = dev->msi_enabled ? nr : 0;
+ return &desc->affinity[idx].mask;
+}
+EXPORT_SYMBOL(pci_irq_get_affinity);
+
+/**
* pci_free_irq_vectors() - Free previously allocated IRQs for a device
* @dev: the PCI device to operate on
*
diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c
index 6fa90d0..d78646d 100644
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -854,44 +854,6 @@ int __pci_enable_msix_range(struct pci_dev *dev,
}
}

-/**
- * pci_irq_get_affinity - return the affinity of a particular MSI vector
- * @dev: PCI device to operate on
- * @nr: device-relative interrupt vector index (0-based).
- *
- * @nr has the following meanings depending on the interrupt mode:
- * MSI-X: The index in the MSI-X vector table
- * MSI: The index of the enabled MSI vectors
- * INTx: Must be 0
- *
- * Return: A cpumask pointer or NULL if @nr is out of range
- */
-const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr)
-{
- int idx, irq = pci_irq_vector(dev, nr);
- struct msi_desc *desc;
-
- if (WARN_ON_ONCE(irq <= 0))
- return NULL;
-
- desc = irq_get_msi_desc(irq);
- /* Non-MSI does not have the information handy */
- if (!desc)
- return cpu_possible_mask;
-
- /* MSI[X] interrupts can be allocated without affinity descriptor */
- if (!desc->affinity)
- return NULL;
-
- /*
- * MSI has a mask array in the descriptor.
- * MSI-X has a single mask.
- */
- idx = dev->msi_enabled ? nr : 0;
- return &desc->affinity[idx].mask;
-}
-EXPORT_SYMBOL(pci_irq_get_affinity);
-
struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc)
{
return to_pci_dev(desc->dev);