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Thu, 10 Oct 2024 10:32:27 +0000 From: =?utf-8?q?Micha=C5=82_Winiarski?= To: , , , , "Bjorn Helgaas" , =?utf-8?q?Christian_K=C3=B6nig?= , =?utf-8?q?Krzy?= =?utf-8?q?sztof_Wilczy=C5=84ski?= , =?utf-8?q?Ilpo_J=C3=A4rvi?= =?utf-8?q?nen?= CC: Rodrigo Vivi , Michal Wajdeczko , Lucas De Marchi , =?utf-8?q?Thomas_Hellstr=C3=B6m?= , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Matt Roper , =?utf-8?q?Micha=C5=82_Winiarski?= Subject: [PATCH v3 4/5] PCI/IOV: Allow extending VF BAR within original resource boundary Date: Thu, 10 Oct 2024 12:32:02 +0200 Message-ID: <20241010103203.382898-5-michal.winiarski@intel.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241010103203.382898-1-michal.winiarski@intel.com> References: <20241010103203.382898-1-michal.winiarski@intel.com> X-ClientProxiedBy: WA2P291CA0007.POLP291.PROD.OUTLOOK.COM (2603:10a6:1d0:1e::10) To DM4PR11MB5373.namprd11.prod.outlook.com (2603:10b6:5:394::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR11MB5373:EE_|MN6PR11MB8103:EE_ X-MS-Office365-Filtering-Correlation-Id: fd2b1505-1539-41b3-3a73-08dce916d5f8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|7416014|1800799024|376014; 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This can be leveraged when the device is exposing lower than optimal BAR size as a default, allowing access to the entire resource when lower number of VFs are created. It is achieved by dynamically resizing the BAR to largest possible value that allows to fit all newly created VFs within the original resource boundary. Signed-off-by: Michał Winiarski --- drivers/pci/iov.c | 92 ++++++++++++++++++++++++++++++++++++++++++++- drivers/pci/pci.h | 1 + include/linux/pci.h | 3 ++ 3 files changed, 95 insertions(+), 1 deletion(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 591a3eae1618a..f9071c1cfe9ee 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -174,6 +174,86 @@ bool pci_iov_is_memory_decoding_enabled(struct pci_dev *dev) return cmd & PCI_SRIOV_CTRL_MSE; } +static void pci_iov_resource_do_extend(struct pci_dev *dev, int resno, u16 num_vfs) +{ + resource_size_t size; + int ret, old, i; + u32 sizes; + + pci_config_pm_runtime_get(dev); + + if (pci_iov_is_memory_decoding_enabled(dev)) { + ret = -EBUSY; + goto err; + } + + sizes = pci_rebar_get_possible_sizes(dev, resno); + if (!sizes) { + ret = -ENOTSUPP; + goto err; + } + + old = pci_rebar_get_current_size(dev, resno); + if (old < 0) { + ret = old; + goto err; + } + + while (sizes > 0) { + i = __fls(sizes); + size = pci_rebar_size_to_bytes(i); + if (size * num_vfs <= pci_resource_len(dev, resno)) { + if (i != old) { + ret = pci_rebar_set_size(dev, resno, size); + if (ret) + goto err; + + pci_iov_resource_set_size(dev, resno, size); + pci_iov_update_resource(dev, resno); + } + break; + } + sizes &= ~BIT(i); + } + + pci_config_pm_runtime_put(dev); + + return; + +err: + pci_warn(dev, "Failed to extend %s: %d\n", + pci_resource_name(dev, resno), ret); + + pci_config_pm_runtime_put(dev); +} + +static void pci_iov_resource_do_restore(struct pci_dev *dev, int resno) +{ + if (dev->sriov->rebar_extend[resno - PCI_IOV_RESOURCES]) + pci_iov_resource_do_extend(dev, resno, dev->sriov->total_VFs); +} + +int pci_iov_resource_extend(struct pci_dev *dev, int resno, bool enable) +{ + if (!pci_resource_is_iov(resno)) { + pci_warn(dev, "%s is not an IOV resource\n", + pci_resource_name(dev, resno)); + + return -ENODEV; + } + + if (!pci_rebar_get_possible_sizes(dev, resno)) + return -ENOTSUPP; + + if (!enable) + pci_iov_resource_do_restore(dev, resno); + + dev->sriov->rebar_extend[resno - PCI_IOV_RESOURCES] = enable; + + return 0; +} +EXPORT_SYMBOL_GPL(pci_iov_resource_extend); + static void pci_read_vf_config_common(struct pci_dev *virtfn) { struct pci_dev *physfn = virtfn->physfn; @@ -438,7 +518,7 @@ static ssize_t sriov_numvfs_store(struct device *dev, const char *buf, size_t count) { struct pci_dev *pdev = to_pci_dev(dev); - int ret = 0; + int i, ret = 0; u16 num_vfs; if (kstrtou16(buf, 0, &num_vfs) < 0) @@ -480,6 +560,11 @@ static ssize_t sriov_numvfs_store(struct device *dev, goto exit; } + for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { + if (pdev->sriov->rebar_extend[i]) + pci_iov_resource_do_extend(pdev, i + PCI_IOV_RESOURCES, num_vfs); + } + ret = pdev->driver->sriov_configure(pdev, num_vfs); if (ret < 0) goto exit; @@ -874,8 +959,13 @@ static int sriov_init(struct pci_dev *dev, int pos) static void sriov_release(struct pci_dev *dev) { + int i; + BUG_ON(dev->sriov->num_VFs); + for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) + pci_iov_resource_do_restore(dev, i + PCI_IOV_RESOURCES); + if (dev != dev->sriov->dev) pci_dev_put(dev->sriov->dev); diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index e15fd8fe0f81f..57e79f75e4c8f 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -403,6 +403,7 @@ struct pci_sriov { u16 subsystem_vendor; /* VF subsystem vendor */ u16 subsystem_device; /* VF subsystem device */ resource_size_t barsz[PCI_SRIOV_NUM_BARS]; /* VF BAR size */ + bool rebar_extend[PCI_SRIOV_NUM_BARS]; /* Resize VF BAR */ bool drivers_autoprobe; /* Auto probing of VFs by driver */ }; diff --git a/include/linux/pci.h b/include/linux/pci.h index 573b4c4c2be61..023c0fa1dd9f2 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -2371,6 +2371,7 @@ int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs); int pci_sriov_get_totalvfs(struct pci_dev *dev); int pci_sriov_configure_simple(struct pci_dev *dev, int nr_virtfn); resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno); +int pci_iov_resource_extend(struct pci_dev *dev, int resno, bool enable); void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool probe); /* Arch may override these (weak) */ @@ -2423,6 +2424,8 @@ static inline int pci_sriov_get_totalvfs(struct pci_dev *dev) #define pci_sriov_configure_simple NULL static inline resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno) { return 0; } +static inline int pci_iov_resource_extend(struct pci_dev *dev, int resno, bool enable) +{ return -ENODEV; } static inline void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool probe) { } #endif