lkml.org 
[lkml]   [2022]   [Nov]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[patch 23/39] PCI/MSI: Move pci_alloc_irq_vectors_affinity() to api.c
Date
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_alloc_irq_vectors_affinity() and let its kernel-doc reference
pci_alloc_irq_vectors() documentation added in parent commit.

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

---
drivers/pci/msi/api.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++-
drivers/pci/msi/msi.c | 65 +----------------------------------------------------
2 files changed, 59 insertions(+), 65 deletions(-)
---
diff --git a/drivers/pci/msi/api.c b/drivers/pci/msi/api.c
index 1714905943fb..8546749afa6e 100644
--- a/drivers/pci/msi/api.c
+++ b/drivers/pci/msi/api.c
@@ -123,3 +123,62 @@ int pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
flags, NULL);
}
EXPORT_SYMBOL(pci_alloc_irq_vectors);
+
+/**
+ * pci_alloc_irq_vectors_affinity() - Allocate multiple device interrupt
+ * vectors with affinity requirements
+ * @dev: the PCI device to operate on
+ * @min_vecs: minimum required number of vectors (must be >= 1)
+ * @max_vecs: maximum desired number of vectors
+ * @flags: allocation flags, as in pci_alloc_irq_vectors()
+ * @affd: affinity requirements (can be %NULL).
+ *
+ * Same as pci_alloc_irq_vectors(), but with the extra @affd parameter.
+ * Check that function docs, and &struct irq_affinity, for more details.
+ */
+int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
+ unsigned int max_vecs, unsigned int flags,
+ struct irq_affinity *affd)
+{
+ struct irq_affinity msi_default_affd = {0};
+ int nvecs = -ENOSPC;
+
+ if (flags & PCI_IRQ_AFFINITY) {
+ if (!affd)
+ affd = &msi_default_affd;
+ } else {
+ if (WARN_ON(affd))
+ affd = NULL;
+ }
+
+ if (flags & PCI_IRQ_MSIX) {
+ nvecs = __pci_enable_msix_range(dev, NULL, min_vecs, max_vecs,
+ affd, flags);
+ if (nvecs > 0)
+ return nvecs;
+ }
+
+ if (flags & PCI_IRQ_MSI) {
+ nvecs = __pci_enable_msi_range(dev, min_vecs, max_vecs, affd);
+ if (nvecs > 0)
+ return nvecs;
+ }
+
+ /* use legacy IRQ if allowed */
+ if (flags & PCI_IRQ_LEGACY) {
+ if (min_vecs == 1 && dev->irq) {
+ /*
+ * Invoke the affinity spreading logic to ensure that
+ * the device driver can adjust queue configuration
+ * for the single interrupt case.
+ */
+ if (affd)
+ irq_create_affinity_masks(1, affd);
+ pci_intx(dev, 1);
+ return 1;
+ }
+ }
+
+ return nvecs;
+}
+EXPORT_SYMBOL(pci_alloc_irq_vectors_affinity);
diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c
index 6700ef1c734e..a028774f438d 100644
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -887,71 +887,6 @@ int __pci_enable_msix_range(struct pci_dev *dev,
}

/**
- * pci_alloc_irq_vectors_affinity - allocate multiple IRQs for a device
- * @dev: PCI device to operate on
- * @min_vecs: minimum number of vectors required (must be >= 1)
- * @max_vecs: maximum (desired) number of vectors
- * @flags: flags or quirks for the allocation
- * @affd: optional description of the affinity requirements
- *
- * Allocate up to @max_vecs interrupt vectors for @dev, using MSI-X or MSI
- * vectors if available, and fall back to a single legacy vector
- * if neither is available. Return the number of vectors allocated,
- * (which might be smaller than @max_vecs) if successful, or a negative
- * error code on error. If less than @min_vecs interrupt vectors are
- * available for @dev the function will fail with -ENOSPC.
- *
- * To get the Linux IRQ number used for a vector that can be passed to
- * request_irq() use the pci_irq_vector() helper.
- */
-int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
- unsigned int max_vecs, unsigned int flags,
- struct irq_affinity *affd)
-{
- struct irq_affinity msi_default_affd = {0};
- int nvecs = -ENOSPC;
-
- if (flags & PCI_IRQ_AFFINITY) {
- if (!affd)
- affd = &msi_default_affd;
- } else {
- if (WARN_ON(affd))
- affd = NULL;
- }
-
- if (flags & PCI_IRQ_MSIX) {
- nvecs = __pci_enable_msix_range(dev, NULL, min_vecs, max_vecs,
- affd, flags);
- if (nvecs > 0)
- return nvecs;
- }
-
- if (flags & PCI_IRQ_MSI) {
- nvecs = __pci_enable_msi_range(dev, min_vecs, max_vecs, affd);
- if (nvecs > 0)
- return nvecs;
- }
-
- /* use legacy IRQ if allowed */
- if (flags & PCI_IRQ_LEGACY) {
- if (min_vecs == 1 && dev->irq) {
- /*
- * Invoke the affinity spreading logic to ensure that
- * the device driver can adjust queue configuration
- * for the single interrupt case.
- */
- if (affd)
- irq_create_affinity_masks(1, affd);
- pci_intx(dev, 1);
- return 1;
- }
- }
-
- return nvecs;
-}
-EXPORT_SYMBOL(pci_alloc_irq_vectors_affinity);
-
-/**
* pci_free_irq_vectors - free previously allocated IRQs for a device
* @dev: PCI device to operate on
*
\
 
 \ /
  Last update: 2022-11-11 14:57    [W:0.793 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site