| Message ID | 20210216160249.749799-2-zhengdejin5@gmail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
| Series | Introduce pcim_alloc_irq_vectors() | expand |
Hi Dejin, > Introduce pcim_alloc_irq_vectors(), a device-managed version of > pci_alloc_irq_vectors(). Introducing this function can simplify > the error handling path in many drivers. > > And use pci_free_irq_vectors() to replace some code in pcim_release(), > they are equivalent, and no functional change. It is more explicit > that pcim_alloc_irq_vectors() is a device-managed function. [...] Some suggestions about the commit message as per: https://lore.kernel.org/linux-pci/YCwE2cf9X%2FGd6lWy@rocinante/ > +/** > + * pcim_alloc_irq_vectors - a device-managed pci_alloc_irq_vectors() > + * @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 > + * > + * 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. > + * > + * 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; > + > + 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); [...] Looks good! Thank you for adding kernel-doc here! Much appreciated. Reviewed-by: Krzysztof Wilczyński <kw@linux.com> Krzysztof
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index b67c4327d307..db799d089c85 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1969,10 +1969,7 @@ static void pcim_release(struct device *gendev, void *res) struct pci_devres *this = res; int i; - if (dev->msi_enabled) - pci_disable_msi(dev); - if (dev->msix_enabled) - pci_disable_msix(dev); + pci_free_irq_vectors(dev); for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) if (this->region_mask & (1 << i)) @@ -2054,6 +2051,34 @@ void pcim_pin_device(struct pci_dev *pdev) } EXPORT_SYMBOL(pcim_pin_device); +/** + * pcim_alloc_irq_vectors - a device-managed pci_alloc_irq_vectors() + * @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 + * + * 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. + * + * 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; + + 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>
Introduce pcim_alloc_irq_vectors(), a device-managed version of pci_alloc_irq_vectors(). Introducing this function can simplify the error handling path in many drivers. And use pci_free_irq_vectors() to replace some code in pcim_release(), they are equivalent, and no functional change. It is more explicit that pcim_alloc_irq_vectors() is a device-managed function. Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com> --- v2 -> v3: - Add some commit comments for replace some codes in pcim_release() by pci_free_irq_vectors(). v1 -> v2: - Use pci_free_irq_vectors() to replace some code in pcim_release(). - Modify some commit messages. drivers/pci/pci.c | 33 +++++++++++++++++++++++++++++---- include/linux/pci.h | 3 +++ 2 files changed, 32 insertions(+), 4 deletions(-)