[PATCH v1 1/4] PCI: Introduce pcim_alloc_irq_vectors()
From: Dejin Zheng <hidden>
Date: 2021-02-15 18:17:16
Also in:
linux-doc, linux-i2c, lkml
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
Introduce pcim_alloc_irq_vectors(), a explicit device-managed version of pci_alloc_irq_vectors(). Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Dejin Zheng <redacted> --- drivers/pci/pci.c | 19 +++++++++++++++++++ include/linux/pci.h | 3 +++ 2 files changed, 22 insertions(+)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index b67c4327d307..33244b512057 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c@@ -2054,6 +2054,25 @@ void pcim_pin_device(struct pci_dev *pdev) } EXPORT_SYMBOL(pcim_pin_device); +/** + * pcim_alloc_irq_vectors - a device-managed pci_alloc_irq_vectors() + * + * It depends on calling pcim_enable_device() to make irq resources manageable. + */ +int pcim_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs, + unsigned int max_vecs, unsigned int flags) +{ + struct pci_devres *dr; + + /*Ensure that the pcim_enable_device() function has been called*/ + dr = find_pci_dr(dev); + if (!dr || !dr->enabled) + return -EINVAL; + + return pci_alloc_irq_vectors(dev, min_vecs, max_vecs, flags); +} +EXPORT_SYMBOL(pcim_alloc_irq_vectors); + /* * pcibios_add_device - provide arch specific hooks when adding device dev * @dev: the PCI device being added
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 86c799c97b77..d75ba85ddfc5 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h@@ -1818,6 +1818,9 @@ pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs, NULL); } +int pcim_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs, + unsigned int max_vecs, unsigned int flags); + /* Include architecture-dependent settings and functions */ #include <asm/pci.h>
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2.25.0