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[185.212.56.112]) by smtp.gmail.com with ESMTPSA id u10sm2292154pfh.123.2021.06.07.08.39.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Jun 2021 08:39:24 -0700 (PDT) From: Dejin Zheng To: helgaas@kernel.org, corbet@lwn.net, jarkko.nikula@linux.intel.com, andriy.shevchenko@linux.intel.com, mika.westerberg@linux.intel.com, rric@kernel.org, bhelgaas@google.com, wsa@kernel.org, Sanket.Goswami@amd.com, linux-doc@vger.kernel.org, linux-i2c@vger.kernel.org, linux-pci@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Dejin Zheng , kernel test robot Subject: [PATCH v7 1/4] PCI: Introduce pcim_alloc_irq_vectors() Date: Mon, 7 Jun 2021 23:39:13 +0800 Message-Id: <20210607153916.1021016-2-zhengdejin5@gmail.com> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210607153916.1021016-1-zhengdejin5@gmail.com> References: <20210607153916.1021016-1-zhengdejin5@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. When CONFIG_PCI=n, there is no stub for pci_is_managed(), but pcim_alloc_irq_vectors() will use it, so add one like other similar stubs. Otherwise there can be build errors, as here by kernel test robot reported: include/linux/pci.h: In function 'pcim_alloc_irq_vectors': >> include/linux/pci.h:1847:7: error: implicit declaration of function 'pci_is_managed' [-Werror=implicit-function-declaration] 1847 | if (!pci_is_managed(dev)) | ^~~~~~~~~~~~~~ Reported-by: kernel test robot Suggested-by: Andy Shevchenko Reviewed-by: Robert Richter Reviewed-by: Andy Shevchenko Acked-by: Bjorn Helgaas Signed-off-by: Dejin Zheng --- v6 -> v7: - rebase to PCI next branch - add a stub for pci_is_managed() when disable PCI for fix build error in sparc architecture. v5 -> v6: - rebase to 5.13-rc4 v4 -> v5: - Remove the check of enable device in pcim_alloc_irq_vectors() and make it as a static line function. v3 -> v4: - No change 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 | 5 +---- include/linux/pci.h | 25 +++++++++++++++++++++++++ 2 files changed, 26 insertions(+), 4 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 452351025a09..e3b3fc59bd35 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1989,10 +1989,7 @@ 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)) diff --git a/include/linux/pci.h b/include/linux/pci.h index c20211e59a57..5783262c4643 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1730,6 +1730,7 @@ static inline struct pci_dev *pci_get_class(unsigned int class, static inline void pci_set_master(struct pci_dev *dev) { } static inline int pci_enable_device(struct pci_dev *dev) { return -EIO; } +static inline int pci_is_managed(struct pci_dev *pdev) { return 0; } static inline void pci_disable_device(struct pci_dev *dev) { } static inline int pcim_enable_device(struct pci_dev *pdev) { return -EIO; } static inline int pci_assign_resource(struct pci_dev *dev, int i) @@ -1825,6 +1826,30 @@ pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs, NULL); } +/** + * 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. + */ +static inline int +pcim_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs, + unsigned int max_vecs, unsigned int flags) +{ + if (!pci_is_managed(dev)) + return -EINVAL; + return pci_alloc_irq_vectors(dev, min_vecs, max_vecs, flags); +} + /* Include architecture-dependent settings and functions */ #include -- 2.30.1