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The capability layout is the same as PCI_EXT_CAP_ID_REBAR. Add the capability ID and restore it as a part of IOV state. See PCIe r6.2, sec 7.8.7. Signed-off-by: Micha=C5=82 Winiarski Reviewed-by: Ilpo J=C3=A4rvinen Reviewed-by: Christian K=C3=B6nig --- drivers/pci/iov.c | 30 +++++++++++++++++++++++++++++- drivers/pci/pci.h | 12 ++++++++++++ include/uapi/linux/pci_regs.h | 9 +++++++++ 3 files changed, 50 insertions(+), 1 deletion(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 10693b5d7eb66..10ccef8afe145 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -7,6 +7,7 @@ * Copyright (C) 2009 Intel Corporation, Yu Zhao */ =20 +#include #include #include #include @@ -850,6 +851,7 @@ static int sriov_init(struct pci_dev *dev, int pos) pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link); if (pci_pcie_type(dev) =3D=3D PCI_EXP_TYPE_RC_END) iov->link =3D PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link); + iov->vf_rebar_cap =3D pci_find_ext_capability(dev, PCI_EXT_CAP_ID_VF_REBA= R); =20 if (pdev) iov->dev =3D pci_dev_get(pdev); @@ -888,6 +890,30 @@ static void sriov_release(struct pci_dev *dev) dev->sriov =3D NULL; } =20 +static void sriov_restore_vf_rebar_state(struct pci_dev *dev) +{ + unsigned int pos, nbars, i; + u32 ctrl; + + pos =3D pci_iov_vf_rebar_cap(dev); + if (!pos) + return; + + pci_read_config_dword(dev, pos + PCI_VF_REBAR_CTRL, &ctrl); + nbars =3D FIELD_GET(PCI_VF_REBAR_CTRL_NBAR_MASK, ctrl); + + for (i =3D 0; i < nbars; i++, pos +=3D 8) { + int bar_idx, size; + + pci_read_config_dword(dev, pos + PCI_VF_REBAR_CTRL, &ctrl); + bar_idx =3D FIELD_GET(PCI_VF_REBAR_CTRL_BAR_IDX, ctrl); + size =3D pci_rebar_bytes_to_size(dev->sriov->barsz[bar_idx]); + ctrl &=3D ~PCI_VF_REBAR_CTRL_BAR_SIZE; + ctrl |=3D FIELD_PREP(PCI_VF_REBAR_CTRL_BAR_SIZE, size); + pci_write_config_dword(dev, pos + PCI_VF_REBAR_CTRL, ctrl); + } +} + static void sriov_restore_state(struct pci_dev *dev) { int i; @@ -1047,8 +1073,10 @@ resource_size_t pci_sriov_resource_alignment(struct = pci_dev *dev, int resno) */ void pci_restore_iov_state(struct pci_dev *dev) { - if (dev->is_physfn) + if (dev->is_physfn) { + sriov_restore_vf_rebar_state(dev); sriov_restore_state(dev); + } } =20 /** diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index adabf59bae40e..3bd507583c3fa 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -494,6 +494,7 @@ 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 */ + u16 vf_rebar_cap; /* VF Resizable BAR capability offset */ bool drivers_autoprobe; /* Auto probing of VFs by driver */ }; =20 @@ -718,6 +719,13 @@ void pci_iov_update_resource(struct pci_dev *dev, int = resno); resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resn= o); void pci_restore_iov_state(struct pci_dev *dev); int pci_iov_bus_range(struct pci_bus *bus); +static inline u16 pci_iov_vf_rebar_cap(struct pci_dev *dev) +{ + if (!dev->is_physfn) + return 0; + + return dev->sriov->vf_rebar_cap; +} static inline bool pci_resource_is_iov(int resno) { return resno >=3D PCI_IOV_RESOURCES && resno <=3D PCI_IOV_RESOURCE_END; @@ -742,6 +750,10 @@ static inline int pci_iov_bus_range(struct pci_bus *bu= s) { return 0; } +static inline u16 pci_iov_vf_rebar_cap(struct pci_dev *dev) +{ + return 0; +} static inline bool pci_resource_is_iov(int resno) { return false; diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h index a3a3e942dedff..f5b17745de607 100644 --- a/include/uapi/linux/pci_regs.h +++ b/include/uapi/linux/pci_regs.h @@ -745,6 +745,7 @@ #define PCI_EXT_CAP_ID_L1SS 0x1E /* L1 PM Substates */ #define PCI_EXT_CAP_ID_PTM 0x1F /* Precision Time Measurement */ #define PCI_EXT_CAP_ID_DVSEC 0x23 /* Designated Vendor-Specific */ +#define PCI_EXT_CAP_ID_VF_REBAR 0x24 /* VF Resizable BAR */ #define PCI_EXT_CAP_ID_DLF 0x25 /* Data Link Feature */ #define PCI_EXT_CAP_ID_PL_16GT 0x26 /* Physical Layer 16.0 GT/s */ #define PCI_EXT_CAP_ID_NPEM 0x29 /* Native PCIe Enclosure Management */ @@ -1141,6 +1142,14 @@ #define PCI_DVSEC_HEADER2 0x8 /* Designated Vendor-Specific Header2 */ #define PCI_DVSEC_HEADER2_ID(x) ((x) & 0xffff) =20 +/* VF Resizable BARs, same layout as PCI_REBAR */ +#define PCI_VF_REBAR_CAP PCI_REBAR_CAP +#define PCI_VF_REBAR_CAP_SIZES PCI_REBAR_CAP_SIZES +#define PCI_VF_REBAR_CTRL PCI_REBAR_CTRL +#define PCI_VF_REBAR_CTRL_BAR_IDX PCI_REBAR_CTRL_BAR_IDX +#define PCI_VF_REBAR_CTRL_NBAR_MASK PCI_REBAR_CTRL_NBAR_MASK +#define PCI_VF_REBAR_CTRL_BAR_SIZE PCI_REBAR_CTRL_BAR_SIZE + /* Data Link Feature */ #define PCI_DLF_CAP 0x04 /* Capabilities Register */ #define PCI_DLF_EXCHANGE_ENABLE 0x80000000 /* Data Link Feature Exchange= Enable */ --=20 2.49.0 From nobody Wed Oct 8 04:05:57 2025 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5B9DD238171; 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Wed, 2 Jul 2025 09:35:50 +0000 From: =?UTF-8?q?Micha=C5=82=20Winiarski?= To: Bjorn Helgaas , , CC: , , =?UTF-8?q?Christian=20K=C3=B6nig?= , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , "Rodrigo Vivi" , Michal Wajdeczko , Lucas De Marchi , =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Matt Roper , =?UTF-8?q?Micha=C5=82=20Winiarski?= Subject: [PATCH v10 2/5] PCI: Add a helper to convert between VF BAR number and IOV resource Date: Wed, 2 Jul 2025 11:35:19 +0200 Message-ID: <20250702093522.518099-3-michal.winiarski@intel.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250702093522.518099-1-michal.winiarski@intel.com> References: <20250702093522.518099-1-michal.winiarski@intel.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: VI1PR0102CA0073.eurprd01.prod.exchangelabs.com (2603:10a6:803:15::14) To DM4PR11MB5373.namprd11.prod.outlook.com (2603:10b6:5:394::7) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR11MB5373:EE_|SJ0PR11MB4846:EE_ X-MS-Office365-Filtering-Correlation-Id: 847f8d62-7e2b-4e53-9344-08ddb94bd4b2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|1800799024; 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Extract the logic to pci_resource_num_from_vf_bar() and pci_resource_num_to_vf_bar() helpers. Suggested-by: Ilpo J=C3=A4rvinen Signed-off-by: Micha=C5=82 Winiarski Acked-by: Christian K=C3=B6nig Reviewed-by: Ilpo J=C3=A4rvinen --- drivers/pci/iov.c | 26 ++++++++++++++++---------- drivers/pci/pci.h | 18 ++++++++++++++++++ drivers/pci/setup-bus.c | 3 ++- 3 files changed, 36 insertions(+), 11 deletions(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 10ccef8afe145..bdac078045525 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -151,7 +151,7 @@ resource_size_t pci_iov_resource_size(struct pci_dev *d= ev, int resno) if (!dev->is_physfn) return 0; =20 - return dev->sriov->barsz[resno - PCI_IOV_RESOURCES]; + return dev->sriov->barsz[pci_resource_num_to_vf_bar(resno)]; } =20 static void pci_read_vf_config_common(struct pci_dev *virtfn) @@ -342,12 +342,14 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id) virtfn->multifunction =3D 0; =20 for (i =3D 0; i < PCI_SRIOV_NUM_BARS; i++) { - res =3D &dev->resource[i + PCI_IOV_RESOURCES]; + int idx =3D pci_resource_num_from_vf_bar(i); + + res =3D &dev->resource[idx]; if (!res->parent) continue; virtfn->resource[i].name =3D pci_name(virtfn); virtfn->resource[i].flags =3D res->flags; - size =3D pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES); + size =3D pci_iov_resource_size(dev, idx); resource_set_range(&virtfn->resource[i], res->start + size * id, size); rc =3D request_resource(res, &virtfn->resource[i]); @@ -644,8 +646,10 @@ static int sriov_enable(struct pci_dev *dev, int nr_vi= rtfn) =20 nres =3D 0; for (i =3D 0; i < PCI_SRIOV_NUM_BARS; i++) { - bars |=3D (1 << (i + PCI_IOV_RESOURCES)); - res =3D &dev->resource[i + PCI_IOV_RESOURCES]; + int idx =3D pci_resource_num_from_vf_bar(i); + + bars |=3D (1 << idx); + res =3D &dev->resource[idx]; if (res->parent) nres++; } @@ -811,8 +815,10 @@ static int sriov_init(struct pci_dev *dev, int pos) =20 nres =3D 0; for (i =3D 0; i < PCI_SRIOV_NUM_BARS; i++) { - res =3D &dev->resource[i + PCI_IOV_RESOURCES]; - res_name =3D pci_resource_name(dev, i + PCI_IOV_RESOURCES); + int idx =3D pci_resource_num_from_vf_bar(i); + + res =3D &dev->resource[idx]; + res_name =3D pci_resource_name(dev, idx); =20 /* * If it is already FIXED, don't change it, something @@ -871,7 +877,7 @@ static int sriov_init(struct pci_dev *dev, int pos) dev->is_physfn =3D 0; failed: for (i =3D 0; i < PCI_SRIOV_NUM_BARS; i++) { - res =3D &dev->resource[i + PCI_IOV_RESOURCES]; + res =3D &dev->resource[pci_resource_num_from_vf_bar(i)]; res->flags =3D 0; } =20 @@ -933,7 +939,7 @@ static void sriov_restore_state(struct pci_dev *dev) pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, ctrl); =20 for (i =3D 0; i < PCI_SRIOV_NUM_BARS; i++) - pci_update_resource(dev, i + PCI_IOV_RESOURCES); + pci_update_resource(dev, pci_resource_num_from_vf_bar(i)); =20 pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz); pci_iov_set_numvfs(dev, iov->num_VFs); @@ -999,7 +1005,7 @@ void pci_iov_update_resource(struct pci_dev *dev, int = resno) { struct pci_sriov *iov =3D dev->is_physfn ? dev->sriov : NULL; struct resource *res =3D pci_resource_n(dev, resno); - int vf_bar =3D resno - PCI_IOV_RESOURCES; + int vf_bar =3D pci_resource_num_to_vf_bar(resno); struct pci_bus_region region; u16 cmd; u32 new; diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 3bd507583c3fa..6f6db4afcc200 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -730,6 +730,14 @@ static inline bool pci_resource_is_iov(int resno) { return resno >=3D PCI_IOV_RESOURCES && resno <=3D PCI_IOV_RESOURCE_END; } +static inline int pci_resource_num_from_vf_bar(int resno) +{ + return resno + PCI_IOV_RESOURCES; +} +static inline int pci_resource_num_to_vf_bar(int resno) +{ + return resno - PCI_IOV_RESOURCES; +} extern const struct attribute_group sriov_pf_dev_attr_group; extern const struct attribute_group sriov_vf_dev_attr_group; #else @@ -758,6 +766,16 @@ static inline bool pci_resource_is_iov(int resno) { return false; } +static inline int pci_resource_num_from_vf_bar(int resno) +{ + WARN_ON_ONCE(1); + return -ENODEV; +} +static inline int pci_resource_num_to_vf_bar(int resno) +{ + WARN_ON_ONCE(1); 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Wed, 2 Jul 2025 09:35:54 +0000 From: =?UTF-8?q?Micha=C5=82=20Winiarski?= To: Bjorn Helgaas , , CC: , , =?UTF-8?q?Christian=20K=C3=B6nig?= , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , "Rodrigo Vivi" , Michal Wajdeczko , Lucas De Marchi , =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Matt Roper , =?UTF-8?q?Micha=C5=82=20Winiarski?= Subject: [PATCH v10 3/5] PCI: Allow IOV resources to be resized in pci_resize_resource() Date: Wed, 2 Jul 2025 11:35:20 +0200 Message-ID: <20250702093522.518099-4-michal.winiarski@intel.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250702093522.518099-1-michal.winiarski@intel.com> References: <20250702093522.518099-1-michal.winiarski@intel.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: WA0P291CA0008.POLP291.PROD.OUTLOOK.COM (2603:10a6:1d0:1::24) To DM4PR11MB5373.namprd11.prod.outlook.com (2603:10b6:5:394::7) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR11MB5373:EE_|SJ0PR11MB4846:EE_ X-MS-Office365-Filtering-Correlation-Id: 1001b0e5-bd8b-40ff-942e-08ddb94bd74b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|1800799024; 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The capability layout is the same as PCI_EXT_CAP_ID_REBAR, which means we can reuse most of the implementation, the only difference being resource size calculation (which is multiplied by total VFs) and memory decoding (which is controlled by a separate VF MSE field in SR-IOV cap). Extend the pci_resize_resource() function to accept IOV resources. See PCIe r6.2, sec 7.8.7. Signed-off-by: Micha=C5=82 Winiarski Reviewed-by: Ilpo J=C3=A4rvinen --- drivers/pci/iov.c | 21 +++++++++++++++++++++ drivers/pci/pci.c | 8 +++++++- drivers/pci/pci.h | 9 +++++++++ drivers/pci/setup-res.c | 35 ++++++++++++++++++++++++++++++----- 4 files changed, 67 insertions(+), 6 deletions(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index bdac078045525..852424cf2ae15 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -154,6 +154,27 @@ resource_size_t pci_iov_resource_size(struct pci_dev *= dev, int resno) return dev->sriov->barsz[pci_resource_num_to_vf_bar(resno)]; } =20 +void pci_iov_resource_set_size(struct pci_dev *dev, int resno, + resource_size_t size) +{ + if (!pci_resource_is_iov(resno)) { + pci_warn(dev, "%s is not an IOV resource\n", + pci_resource_name(dev, resno)); + return; + } + + dev->sriov->barsz[pci_resource_num_to_vf_bar(resno)] =3D size; +} + +bool pci_iov_is_memory_decoding_enabled(struct pci_dev *dev) +{ + u16 cmd; + + pci_read_config_word(dev, dev->sriov->pos + PCI_SRIOV_CTRL, &cmd); + + return cmd & PCI_SRIOV_CTRL_MSE; +} + static void pci_read_vf_config_common(struct pci_dev *virtfn) { struct pci_dev *physfn =3D virtfn->physfn; diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index e9448d55113bd..55695852975b4 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -3752,7 +3752,13 @@ static int pci_rebar_find_pos(struct pci_dev *pdev, = int bar) unsigned int pos, nbars, i; u32 ctrl; =20 - pos =3D pdev->rebar_cap; + if (pci_resource_is_iov(bar)) { + pos =3D pci_iov_vf_rebar_cap(pdev); + bar =3D pci_resource_num_to_vf_bar(bar); + } else { + pos =3D pdev->rebar_cap; + } + if (!pos) return -ENOTSUPP; =20 diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 6f6db4afcc200..c233601532711 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -719,6 +719,9 @@ void pci_iov_update_resource(struct pci_dev *dev, int r= esno); resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resn= o); void pci_restore_iov_state(struct pci_dev *dev); int pci_iov_bus_range(struct pci_bus *bus); +void pci_iov_resource_set_size(struct pci_dev *dev, int resno, + resource_size_t size); +bool pci_iov_is_memory_decoding_enabled(struct pci_dev *dev); static inline u16 pci_iov_vf_rebar_cap(struct pci_dev *dev) { if (!dev->is_physfn) @@ -758,6 +761,12 @@ static inline int pci_iov_bus_range(struct pci_bus *bu= s) { return 0; } +static inline void pci_iov_resource_set_size(struct pci_dev *dev, int resn= o, + resource_size_t size) { } +static inline bool pci_iov_is_memory_decoding_enabled(struct pci_dev *dev) +{ + return false; +} static inline u16 pci_iov_vf_rebar_cap(struct pci_dev *dev) { return 0; diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index c6657cdd06f67..d2b3ed51e8804 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -423,13 +423,39 @@ void pci_release_resource(struct pci_dev *dev, int re= sno) } EXPORT_SYMBOL(pci_release_resource); =20 +static bool pci_resize_is_memory_decoding_enabled(struct pci_dev *dev, + int resno) +{ + u16 cmd; + + if (pci_resource_is_iov(resno)) + return pci_iov_is_memory_decoding_enabled(dev); + + pci_read_config_word(dev, PCI_COMMAND, &cmd); + + return cmd & PCI_COMMAND_MEMORY; +} + +static void pci_resize_resource_set_size(struct pci_dev *dev, int resno, + int size) +{ + resource_size_t res_size =3D pci_rebar_size_to_bytes(size); + struct resource *res =3D pci_resource_n(dev, resno); + + if (!pci_resource_is_iov(resno)) { + resource_set_size(res, res_size); + } else { + resource_set_size(res, res_size * pci_sriov_get_totalvfs(dev)); + pci_iov_resource_set_size(dev, resno, res_size); + } +} + int pci_resize_resource(struct pci_dev *dev, int resno, int size) { struct resource *res =3D pci_resource_n(dev, resno); struct pci_host_bridge *host; int old, ret; u32 sizes; - u16 cmd; =20 /* Check if we must preserve the firmware's resource assignment */ host =3D pci_find_host_bridge(dev->bus); @@ -440,8 +466,7 @@ int pci_resize_resource(struct pci_dev *dev, int resno,= int size) if (!(res->flags & IORESOURCE_UNSET)) return -EBUSY; =20 - pci_read_config_word(dev, PCI_COMMAND, &cmd); - if (cmd & PCI_COMMAND_MEMORY) + if (pci_resize_is_memory_decoding_enabled(dev, resno)) return -EBUSY; =20 sizes =3D pci_rebar_get_possible_sizes(dev, resno); @@ -459,7 +484,7 @@ int pci_resize_resource(struct pci_dev *dev, int resno,= int size) if (ret) return ret; =20 - resource_set_size(res, pci_rebar_size_to_bytes(size)); + pci_resize_resource_set_size(dev, resno, size); =20 /* Check if the new config works by trying to assign everything. */ if (dev->bus->self) { @@ -471,7 +496,7 @@ int pci_resize_resource(struct pci_dev *dev, int resno,= int size) =20 error_resize: pci_rebar_set_size(dev, resno, old); - resource_set_size(res, pci_rebar_size_to_bytes(old)); + pci_resize_resource_set_size(dev, resno, old); return ret; } EXPORT_SYMBOL(pci_resize_resource); --=20 2.49.0 From nobody Wed Oct 8 04:05:57 2025 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1C78D248883; 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If for whatever reason it's not possible to accommodate all VFs - the resource is not assigned and no VFs can be created. An upcoming change will allow VF BAR size to be modified by drivers at a later point in time, which means that the check for resource assignment is no longer sufficient. Add an additional check that verifies that VF BAR for all enabled VFs fits within the underlying reservation resource. Signed-off-by: Micha=C5=82 Winiarski Reviewed-by: Ilpo J=C3=A4rvinen --- drivers/pci/iov.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 852424cf2ae15..f34173c70b32a 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -668,9 +668,12 @@ static int sriov_enable(struct pci_dev *dev, int nr_vi= rtfn) nres =3D 0; for (i =3D 0; i < PCI_SRIOV_NUM_BARS; i++) { int idx =3D pci_resource_num_from_vf_bar(i); + resource_size_t vf_bar_sz =3D pci_iov_resource_size(dev, idx); =20 bars |=3D (1 << idx); res =3D &dev->resource[idx]; + if (vf_bar_sz * nr_virtfn > resource_size(res)) + continue; if (res->parent) nres++; } --=20 2.49.0 From nobody Wed Oct 8 04:05:57 2025 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9FFA9242D93; Wed, 2 Jul 2025 09:36:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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Wed, 2 Jul 2025 09:36:03 +0000 From: =?UTF-8?q?Micha=C5=82=20Winiarski?= To: Bjorn Helgaas , , CC: , , =?UTF-8?q?Christian=20K=C3=B6nig?= , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , "Rodrigo Vivi" , Michal Wajdeczko , Lucas De Marchi , =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Matt Roper , =?UTF-8?q?Micha=C5=82=20Winiarski?= Subject: [PATCH v10 5/5] PCI: Allow drivers to control VF BAR size Date: Wed, 2 Jul 2025 11:35:22 +0200 Message-ID: <20250702093522.518099-6-michal.winiarski@intel.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250702093522.518099-1-michal.winiarski@intel.com> References: <20250702093522.518099-1-michal.winiarski@intel.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: VI1P190CA0001.EURP190.PROD.OUTLOOK.COM (2603:10a6:802:2b::14) To DM4PR11MB5373.namprd11.prod.outlook.com (2603:10b6:5:394::7) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR11MB5373:EE_|SJ0PR11MB4846:EE_ X-MS-Office365-Filtering-Correlation-Id: bcfb779d-3197-4c82-2340-08ddb94bdccc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|1800799024; 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Add a pci_iov_vf_bar_set_size() function to control the size and a pci_iov_vf_bar_get_sizes() helper to get the VF BAR sizes that will allow up to num_vfs to be successfully enabled with the current underlying reservation size. Signed-off-by: Micha=C5=82 Winiarski Reviewed-by: Ilpo J=C3=A4rvinen --- drivers/pci/iov.c | 73 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/pci.h | 6 ++++ 2 files changed, 79 insertions(+) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index f34173c70b32a..ac4375954c947 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -8,11 +8,15 @@ */ =20 #include +#include +#include #include +#include #include #include #include #include +#include #include "pci.h" =20 #define VIRTFN_ID_LEN 17 /* "virtfn%u\0" for 2^32 - 1 */ @@ -1313,3 +1317,72 @@ int pci_sriov_configure_simple(struct pci_dev *dev, = int nr_virtfn) return nr_virtfn; } EXPORT_SYMBOL_GPL(pci_sriov_configure_simple); + +/** + * pci_iov_vf_bar_set_size - set a new size for a VF BAR + * @dev: the PCI device + * @resno: the resource number + * @size: new size as defined in the spec (0=3D1MB, 31=3D128TB) + * + * Set the new size of a VF BAR that supports VF resizable BAR capability. + * Unlike pci_resize_resource(), this does not cause the resource that + * reserves the MMIO space (originally up to total_VFs) to be resized, whi= ch + * means that following calls to pci_enable_sriov() can fail if the resour= ces + * no longer fit. + * + * Return: 0 on success, or negative on failure. + */ +int pci_iov_vf_bar_set_size(struct pci_dev *dev, int resno, int size) +{ + u32 sizes; + int ret; + + if (!pci_resource_is_iov(resno)) + return -EINVAL; + + if (pci_iov_is_memory_decoding_enabled(dev)) + return -EBUSY; + + sizes =3D pci_rebar_get_possible_sizes(dev, resno); + if (!sizes) + return -ENOTSUPP; + + if (!(sizes & BIT(size))) + return -EINVAL; + + ret =3D pci_rebar_set_size(dev, resno, size); + if (ret) + return ret; + + pci_iov_resource_set_size(dev, resno, pci_rebar_size_to_bytes(size)); + + return 0; +} +EXPORT_SYMBOL_GPL(pci_iov_vf_bar_set_size); + +/** + * pci_iov_vf_bar_get_sizes - get VF BAR sizes allowing to create up to nu= m_vfs + * @dev: the PCI device + * @resno: the resource number + * @num_vfs: number of VFs + * + * Get the sizes of a VF resizable BAR that can accommodate @num_vfs within + * the currently assigned size of the resource @resno. + * + * Return: A bitmask of sizes in format defined in the spec (bit 0=3D1MB, + * bit 31=3D128TB). + */ +u32 pci_iov_vf_bar_get_sizes(struct pci_dev *dev, int resno, int num_vfs) +{ + u64 vf_len =3D pci_resource_len(dev, resno); + u32 sizes; + + if (!num_vfs) + return 0; + + do_div(vf_len, num_vfs); + sizes =3D (roundup_pow_of_two(vf_len + 1) - 1) >> ilog2(SZ_1M); + + return sizes & pci_rebar_get_possible_sizes(dev, resno); +} +EXPORT_SYMBOL_GPL(pci_iov_vf_bar_get_sizes); diff --git a/include/linux/pci.h b/include/linux/pci.h index 05e68f35f3923..28f06045ab200 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -2438,6 +2438,8 @@ int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 n= umvfs); 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_vf_bar_set_size(struct pci_dev *dev, int resno, int size); +u32 pci_iov_vf_bar_get_sizes(struct pci_dev *dev, int resno, int num_vfs); void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool probe); =20 /* Arch may override these (weak) */ @@ -2490,6 +2492,10 @@ 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, i= nt resno) { return 0; } +static inline int pci_iov_vf_bar_set_size(struct pci_dev *dev, int resno, = int size) +{ return -ENODEV; } +static inline u32 pci_iov_vf_bar_get_sizes(struct pci_dev *dev, int resno,= int num_vfs) +{ return 0; } static inline void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool prob= e) { } #endif =20 --=20 2.49.0