[PATCH 01/37] PCI/MSI: Add Devres managed IRQ vectors allocation

Shawn Lin
2026-02-23T22:21:46Z

pcim_alloc_irq_vectors() and pcim_alloc_irq_vectors_affinity() are created for
pci device drivers which rely on the devres machinery to help cleanup the IRQ
vectors.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
---

drivers/pci/msi/api.c | 26 ++++++++++++++++++++++++++
include/linux/pci.h | 22 ++++++++++++++++++++++
2 files changed, 48 insertions(+)

diff --git a/drivers/pci/msi/api.c b/drivers/pci/msi/api.c
index c18559b..2362fca 100644
--- a/drivers/pci/msi/api.c
+++ b/drivers/pci/msi/api.c
@@ -297,6 +297,32 @@ int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
EXPORT_SYMBOL(pci_alloc_irq_vectors_affinity);

/**
+ * pcim_alloc_irq_vectors() - devres managed pci_alloc_irq_vectors()
+ * Interrupt vectors are automatically freed by the devres machinery
+ */
+int pcim_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
+ unsigned int max_vecs, unsigned int flags)
+{
+ return pcim_alloc_irq_vectors_affinity(dev, min_vecs, max_vecs,
+ flags, NULL);
+}
+EXPORT_SYMBOL(pcim_alloc_irq_vectors);
+
+/**
+ * pcim_alloc_irq_vectors_affinity() - devres managed pci_alloc_irq_vectors_affinity()
+ * Interrupt vectors are automatically freed by the devres machinery
+ */
+int pcim_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
+ unsigned int max_vecs, unsigned int flags,
+ struct irq_affinity *affd)
+{
+ dev->is_msi_managed = true;
+ return pci_alloc_irq_vectors_affinity(dev, min_vecs, max_vecs,
+ flags, affd);
+}
+EXPORT_SYMBOL(pcim_alloc_irq_vectors_affinity);
+
+/**
* pci_irq_vector() - Get Linux IRQ number of a device interrupt vector
* @dev: the PCI device to operate on
* @nr: device-relative interrupt vector index (0-based); has different
diff --git a/include/linux/pci.h b/include/linux/pci.h
index d5ec0f8..ae58f70 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1764,6 +1764,12 @@ 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);

+int pcim_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
+ unsigned int max_vecs, unsigned int flags);
+int pcim_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
+ unsigned int max_vecs, unsigned int flags,
+ struct irq_affinity *affd);
+
bool pci_msix_can_alloc_dyn(struct pci_dev *dev);
struct msi_map pci_msix_alloc_irq_at(struct pci_dev *dev, unsigned int index,
const struct irq_affinity_desc *affdesc);
@@ -1806,6 +1812,22 @@ pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
flags, NULL);
}

+static inline int
+pcim_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
+ unsigned int max_vecs, unsigned int flags,
+ struct irq_affinity *aff_desc)
+{
+ return pci_alloc_irq_vectors_affinity(dev, min_vecs, max_vecs,
+ flags, aff_desc);
+}
+static inline int
+pcim_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
+ unsigned int max_vecs, unsigned int flags)
+{
+ return pcim_alloc_irq_vectors_affinity(dev, min_vecs, max_vecs,
+ flags, NULL);
+}
+
static inline bool pci_msix_can_alloc_dyn(struct pci_dev *dev)
{ return false; }
static inline struct msi_map pci_msix_alloc_irq_at(struct pci_dev *dev, unsigned int index,
--
2.7.4