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[2003:ea:8bc0:e400:7c68:4b91:65b0:560]) by smtp.googlemail.com with ESMTPSA id k5sm5307315wmg.21.2017.12.09.15.43.57 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 09 Dec 2017 15:43:57 -0800 (PST) From: Heiner Kallweit Subject: [PATCH 1/3] PCI: introduce a device-managed version of pci_set_mwi To: Realtek linux nic maintainers , Bjorn Helgaas Cc: "netdev@vger.kernel.org" , "linux-pci@vger.kernel.org" References: <9eee5aba-a739-a609-fd65-76666f377ed1@gmail.com> Message-ID: <3e560e2b-7f11-74e2-6db5-60c8479dc59b@gmail.com> Date: Sun, 10 Dec 2017 00:43:48 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 MIME-Version: 1.0 In-Reply-To: <9eee5aba-a739-a609-fd65-76666f377ed1@gmail.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Introduce a device-managed version of pci_set_mwi. First user is the Realtek r8169 driver. Signed-off-by: Heiner Kallweit Acked-by: Bjorn Helgaas --- drivers/pci/pci.c | 29 +++++++++++++++++++++++++++++ include/linux/pci.h | 1 + 2 files changed, 30 insertions(+) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 4a7c6864f..fc57c378d 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1458,6 +1458,7 @@ struct pci_devres { unsigned int pinned:1; unsigned int orig_intx:1; unsigned int restore_intx:1; + unsigned int mwi:1; u32 region_mask; }; @@ -1476,6 +1477,9 @@ static void pcim_release(struct device *gendev, void *res) if (this->region_mask & (1 << i)) pci_release_region(dev, i); + if (this->mwi) + pci_clear_mwi(dev); + if (this->restore_intx) pci_intx(dev, this->orig_intx); @@ -3760,6 +3764,31 @@ int pci_set_mwi(struct pci_dev *dev) } EXPORT_SYMBOL(pci_set_mwi); +/** + * pcim_set_mwi - Managed pci_set_mwi() + * @dev: the PCI device for which MWI is enabled + * + * Managed pci_set_mwi(). + * + * RETURNS: An appropriate -ERRNO error value on error, or zero for success. + */ +int pcim_set_mwi(struct pci_dev *dev) +{ + struct pci_devres *dr; + int ret; + + ret = pci_set_mwi(dev); + if (ret) + return ret; + + dr = find_pci_dr(dev); + if (dr) + dr->mwi = 1; + + return 0; +} +EXPORT_SYMBOL(pcim_set_mwi); + /** * pci_try_set_mwi - enables memory-write-invalidate PCI transaction * @dev: the PCI device for which MWI is enabled diff --git a/include/linux/pci.h b/include/linux/pci.h index 978aad784..0a7ac863a 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1064,6 +1064,7 @@ int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state); int pci_set_cacheline_size(struct pci_dev *dev); #define HAVE_PCI_SET_MWI int __must_check pci_set_mwi(struct pci_dev *dev); +int __must_check pcim_set_mwi(struct pci_dev *dev); int pci_try_set_mwi(struct pci_dev *dev); void pci_clear_mwi(struct pci_dev *dev); void pci_intx(struct pci_dev *dev, int enable);