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[185.212.56.4]) by smtp.gmail.com with ESMTPSA id z2sm19202572pfj.100.2021.02.15.10.15.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Feb 2021 10:15:57 -0800 (PST) From: Dejin Zheng To: 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, linux-doc@vger.kernel.org, linux-i2c@vger.kernel.org, linux-pci@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Dejin Zheng Subject: [PATCH v1 1/4] PCI: Introduce pcim_alloc_irq_vectors() Date: Tue, 16 Feb 2021 02:15:47 +0800 Message-Id: <20210215181550.714101-2-zhengdejin5@gmail.com> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20210215181550.714101-1-zhengdejin5@gmail.com> References: <20210215181550.714101-1-zhengdejin5@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Introduce pcim_alloc_irq_vectors(), a explicit device-managed version of pci_alloc_irq_vectors(). Suggested-by: Andy Shevchenko Signed-off-by: Dejin Zheng --- 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