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Thu, 19 Aug 2021 07:34:37 -0500 Received: from DLEE114.ent.ti.com (157.170.170.25) by DLEE107.ent.ti.com (157.170.170.37) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Thu, 19 Aug 2021 07:34:37 -0500 Received: from lelv0327.itg.ti.com (10.180.67.183) by DLEE114.ent.ti.com (157.170.170.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2 via Frontend Transport; Thu, 19 Aug 2021 07:34:37 -0500 Received: from a0393678-ssd.dal.design.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0327.itg.ti.com (8.15.2/8.15.2) with ESMTP id 17JCXlZU035715; Thu, 19 Aug 2021 07:34:30 -0500 From: Kishon Vijay Abraham I To: Lorenzo Pieralisi , Bjorn Helgaas , Jonathan Corbet , Rob Herring , Arnd Bergmann CC: Greg Kroah-Hartman , Tom Joseph , Jingoo Han , Gustavo Pimentel , Marek Vasut , Yoshihiro Shimoda , Shawn Lin , Heiko Stuebner , , , , , , , , Kishon Vijay Abraham I Subject: [PATCH v9 6/8] PCI: cadence: Add support to configure virtual functions Date: Thu, 19 Aug 2021 18:03:41 +0530 Message-ID: <20210819123343.1951-7-kishon@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210819123343.1951-1-kishon@ti.com> References: <20210819123343.1951-1-kishon@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210819_053447_331870_A07985B3 X-CRM114-Status: GOOD ( 25.18 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Now that support for SR-IOV is added in PCIe endpoint core, add support to configure virtual functions in the Cadence PCIe EP driver. Signed-off-by: Kishon Vijay Abraham I --- .../pci/controller/cadence/pcie-cadence-ep.c | 140 +++++++++++++++--- drivers/pci/controller/cadence/pcie-cadence.h | 9 ++ 2 files changed, 128 insertions(+), 21 deletions(-) diff --git a/drivers/pci/controller/cadence/pcie-cadence-ep.c b/drivers/pci/controller/cadence/pcie-cadence-ep.c index f337f0842400..b693c5f6a449 100644 --- a/drivers/pci/controller/cadence/pcie-cadence-ep.c +++ b/drivers/pci/controller/cadence/pcie-cadence-ep.c @@ -16,11 +16,37 @@ #define CDNS_PCIE_EP_IRQ_PCI_ADDR_NONE 0x1 #define CDNS_PCIE_EP_IRQ_PCI_ADDR_LEGACY 0x3 +static u8 cdns_pcie_get_fn_from_vfn(struct cdns_pcie *pcie, u8 fn, u8 vfn) +{ + u32 cap = CDNS_PCIE_EP_FUNC_SRIOV_CAP_OFFSET; + u32 first_vf_offset, stride; + + if (vfn == 0) + return fn; + + first_vf_offset = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_SRIOV_VF_OFFSET); + stride = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_SRIOV_VF_STRIDE); + fn = fn + first_vf_offset + ((vfn - 1) * stride); + + return fn; +} + static int cdns_pcie_ep_write_header(struct pci_epc *epc, u8 fn, u8 vfn, struct pci_epf_header *hdr) { struct cdns_pcie_ep *ep = epc_get_drvdata(epc); + u32 cap = CDNS_PCIE_EP_FUNC_SRIOV_CAP_OFFSET; struct cdns_pcie *pcie = &ep->pcie; + u32 reg; + + if (vfn > 1) { + dev_err(&epc->dev, "Only Virtual Function #1 has deviceID\n"); + return -EINVAL; + } else if (vfn == 1) { + reg = cap + PCI_SRIOV_VF_DID; + cdns_pcie_ep_fn_writew(pcie, fn, reg, hdr->deviceid); + return 0; + } cdns_pcie_ep_fn_writew(pcie, fn, PCI_DEVICE_ID, hdr->deviceid); cdns_pcie_ep_fn_writeb(pcie, fn, PCI_REVISION_ID, hdr->revid); @@ -92,21 +118,30 @@ static int cdns_pcie_ep_set_bar(struct pci_epc *epc, u8 fn, u8 vfn, addr0 = lower_32_bits(bar_phys); addr1 = upper_32_bits(bar_phys); + + if (vfn == 1) + reg = CDNS_PCIE_LM_EP_VFUNC_BAR_CFG(bar, fn); + else + reg = CDNS_PCIE_LM_EP_FUNC_BAR_CFG(bar, fn); + b = (bar < BAR_4) ? bar : bar - BAR_4; + + if (vfn == 0 || vfn == 1) { + cfg = cdns_pcie_readl(pcie, reg); + cfg &= ~(CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE_MASK(b) | + CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b)); + cfg |= (CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE(b, aperture) | + CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL(b, ctrl)); + cdns_pcie_writel(pcie, reg, cfg); + } + + fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn); cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR0(fn, bar), addr0); cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR1(fn, bar), addr1); - reg = CDNS_PCIE_LM_EP_FUNC_BAR_CFG(bar, fn); - b = (bar < BAR_4) ? bar : bar - BAR_4; - - cfg = cdns_pcie_readl(pcie, reg); - cfg &= ~(CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE_MASK(b) | - CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b)); - cfg |= (CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE(b, aperture) | - CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL(b, ctrl)); - cdns_pcie_writel(pcie, reg, cfg); - + if (vfn > 0) + epf = &epf->epf[vfn - 1]; epf->epf_bar[bar] = epf_bar; return 0; @@ -121,19 +156,27 @@ static void cdns_pcie_ep_clear_bar(struct pci_epc *epc, u8 fn, u8 vfn, enum pci_barno bar = epf_bar->barno; u32 reg, cfg, b, ctrl; - reg = CDNS_PCIE_LM_EP_FUNC_BAR_CFG(bar, fn); + if (vfn == 1) + reg = CDNS_PCIE_LM_EP_VFUNC_BAR_CFG(bar, fn); + else + reg = CDNS_PCIE_LM_EP_FUNC_BAR_CFG(bar, fn); b = (bar < BAR_4) ? bar : bar - BAR_4; - ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_DISABLED; - cfg = cdns_pcie_readl(pcie, reg); - cfg &= ~(CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE_MASK(b) | - CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b)); - cfg |= CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL(b, ctrl); - cdns_pcie_writel(pcie, reg, cfg); + if (vfn == 0 || vfn == 1) { + ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_DISABLED; + cfg = cdns_pcie_readl(pcie, reg); + cfg &= ~(CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE_MASK(b) | + CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b)); + cfg |= CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL(b, ctrl); + cdns_pcie_writel(pcie, reg, cfg); + } + fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn); cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR0(fn, bar), 0); cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR1(fn, bar), 0); + if (vfn > 0) + epf = &epf->epf[vfn - 1]; epf->epf_bar[bar] = NULL; } @@ -151,6 +194,7 @@ static int cdns_pcie_ep_map_addr(struct pci_epc *epc, u8 fn, u8 vfn, return -EINVAL; } + fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn); cdns_pcie_set_outbound_region(pcie, 0, fn, r, false, addr, pci_addr, size); set_bit(r, &ep->ob_region_map); @@ -186,6 +230,8 @@ static int cdns_pcie_ep_set_msi(struct pci_epc *epc, u8 fn, u8 vfn, u8 mmc) u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET; u16 flags; + fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn); + /* * Set the Multiple Message Capable bitfield into the Message Control * register. @@ -206,6 +252,8 @@ static int cdns_pcie_ep_get_msi(struct pci_epc *epc, u8 fn, u8 vfn) u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET; u16 flags, mme; + fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn); + /* Validate that the MSI feature is actually enabled. */ flags = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_MSI_FLAGS); if (!(flags & PCI_MSI_FLAGS_ENABLE)) @@ -227,6 +275,8 @@ static int cdns_pcie_ep_get_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no) u32 cap = CDNS_PCIE_EP_FUNC_MSIX_CAP_OFFSET; u32 val, reg; + func_no = cdns_pcie_get_fn_from_vfn(pcie, func_no, vfunc_no); + reg = cap + PCI_MSIX_FLAGS; val = cdns_pcie_ep_fn_readw(pcie, func_no, reg); if (!(val & PCI_MSIX_FLAGS_ENABLE)) @@ -246,6 +296,8 @@ static int cdns_pcie_ep_set_msix(struct pci_epc *epc, u8 fn, u8 vfn, u32 cap = CDNS_PCIE_EP_FUNC_MSIX_CAP_OFFSET; u32 val, reg; + fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn); + reg = cap + PCI_MSIX_FLAGS; val = cdns_pcie_ep_fn_readw(pcie, fn, reg); val &= ~PCI_MSIX_FLAGS_QSIZE; @@ -265,8 +317,8 @@ static int cdns_pcie_ep_set_msix(struct pci_epc *epc, u8 fn, u8 vfn, return 0; } -static void cdns_pcie_ep_assert_intx(struct cdns_pcie_ep *ep, u8 fn, - u8 intx, bool is_asserted) +static void cdns_pcie_ep_assert_intx(struct cdns_pcie_ep *ep, u8 fn, u8 intx, + bool is_asserted) { struct cdns_pcie *pcie = &ep->pcie; unsigned long flags; @@ -335,6 +387,8 @@ static int cdns_pcie_ep_send_msi_irq(struct cdns_pcie_ep *ep, u8 fn, u8 vfn, u8 msi_count; u64 pci_addr, pci_addr_mask = 0xff; + fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn); + /* Check whether the MSI feature has been enabled by the PCI host. */ flags = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_MSI_FLAGS); if (!(flags & PCI_MSI_FLAGS_ENABLE)) @@ -388,6 +442,8 @@ static int cdns_pcie_ep_map_msi_irq(struct pci_epc *epc, u8 fn, u8 vfn, int ret; int i; + fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn); + /* Check whether the MSI feature has been enabled by the PCI host. */ flags = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_MSI_FLAGS); if (!(flags & PCI_MSI_FLAGS_ENABLE)) @@ -438,6 +494,12 @@ static int cdns_pcie_ep_send_msix_irq(struct cdns_pcie_ep *ep, u8 fn, u8 vfn, u16 flags; u8 bir; + epf = &ep->epf[fn]; + if (vfn > 0) + epf = &epf->epf[vfn - 1]; + + fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn); + /* Check whether the MSI-X feature has been enabled by the PCI host. */ flags = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_MSIX_FLAGS); if (!(flags & PCI_MSIX_FLAGS_ENABLE)) @@ -448,7 +510,6 @@ static int cdns_pcie_ep_send_msix_irq(struct cdns_pcie_ep *ep, u8 fn, u8 vfn, bir = tbl_offset & PCI_MSIX_TABLE_BIR; tbl_offset &= PCI_MSIX_TABLE_OFFSET; - epf = &ep->epf[fn]; msix_tbl = epf->epf_bar[bir]->addr + tbl_offset; msg_addr = msix_tbl[(interrupt_num - 1)].msg_addr; msg_data = msix_tbl[(interrupt_num - 1)].msg_data; @@ -475,9 +536,15 @@ static int cdns_pcie_ep_raise_irq(struct pci_epc *epc, u8 fn, u8 vfn, u16 interrupt_num) { struct cdns_pcie_ep *ep = epc_get_drvdata(epc); + struct cdns_pcie *pcie = &ep->pcie; + struct device *dev = pcie->dev; switch (type) { case PCI_EPC_IRQ_LEGACY: + if (vfn > 0) { + dev_err(dev, "Cannot raise legacy interrupts for VF\n"); + return -EINVAL; + } return cdns_pcie_ep_send_legacy_irq(ep, fn, vfn, 0); case PCI_EPC_IRQ_MSI: @@ -515,6 +582,13 @@ static int cdns_pcie_ep_start(struct pci_epc *epc) return 0; } +static const struct pci_epc_features cdns_pcie_epc_vf_features = { + .linkup_notifier = false, + .msi_capable = true, + .msix_capable = true, + .align = 65536, +}; + static const struct pci_epc_features cdns_pcie_epc_features = { .linkup_notifier = false, .msi_capable = true, @@ -525,7 +599,10 @@ static const struct pci_epc_features cdns_pcie_epc_features = { static const struct pci_epc_features* cdns_pcie_ep_get_features(struct pci_epc *epc, u8 func_no, u8 vfunc_no) { - return &cdns_pcie_epc_features; + if (!vfunc_no) + return &cdns_pcie_epc_features; + + return &cdns_pcie_epc_vf_features; } static const struct pci_epc_ops cdns_pcie_epc_ops = { @@ -551,9 +628,11 @@ int cdns_pcie_ep_setup(struct cdns_pcie_ep *ep) struct platform_device *pdev = to_platform_device(dev); struct device_node *np = dev->of_node; struct cdns_pcie *pcie = &ep->pcie; + struct cdns_pcie_epf *epf; struct resource *res; struct pci_epc *epc; int ret; + int i; pcie->is_rc = false; @@ -598,6 +677,25 @@ int cdns_pcie_ep_setup(struct cdns_pcie_ep *ep) if (!ep->epf) return -ENOMEM; + epc->max_vfs = devm_kcalloc(dev, epc->max_functions, + sizeof(*epc->max_vfs), GFP_KERNEL); + if (!epc->max_vfs) + return -ENOMEM; + + ret = of_property_read_u8_array(np, "max-virtual-functions", + epc->max_vfs, epc->max_functions); + if (ret == 0) { + for (i = 0; i < epc->max_functions; i++) { + epf = &ep->epf[i]; + if (epc->max_vfs[i] == 0) + continue; + epf->epf = devm_kcalloc(dev, epc->max_vfs[i], + sizeof(*ep->epf), GFP_KERNEL); + if (!epf->epf) + return -ENOMEM; + } + } + ret = pci_epc_mem_init(epc, pcie->mem_res->start, resource_size(pcie->mem_res), PAGE_SIZE); if (ret < 0) { diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h index 347ed7bd2038..c3fb9021194c 100644 --- a/drivers/pci/controller/cadence/pcie-cadence.h +++ b/drivers/pci/controller/cadence/pcie-cadence.h @@ -53,6 +53,12 @@ (CDNS_PCIE_LM_BASE + 0x0240 + (fn) * 0x0008) #define CDNS_PCIE_LM_EP_FUNC_BAR_CFG1(fn) \ (CDNS_PCIE_LM_BASE + 0x0244 + (fn) * 0x0008) +#define CDNS_PCIE_LM_EP_VFUNC_BAR_CFG(bar, fn) \ + (((bar) < BAR_4) ? CDNS_PCIE_LM_EP_VFUNC_BAR_CFG0(fn) : CDNS_PCIE_LM_EP_VFUNC_BAR_CFG1(fn)) +#define CDNS_PCIE_LM_EP_VFUNC_BAR_CFG0(fn) \ + (CDNS_PCIE_LM_BASE + 0x0280 + (fn) * 0x0008) +#define CDNS_PCIE_LM_EP_VFUNC_BAR_CFG1(fn) \ + (CDNS_PCIE_LM_BASE + 0x0284 + (fn) * 0x0008) #define CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE_MASK(b) \ (GENMASK(4, 0) << ((b) * 8)) #define CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE(b, a) \ @@ -117,6 +123,7 @@ #define CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET 0x90 #define CDNS_PCIE_EP_FUNC_MSIX_CAP_OFFSET 0xb0 +#define CDNS_PCIE_EP_FUNC_SRIOV_CAP_OFFSET 0x200 /* * Root Port Registers (PCI configuration space for the root port function) @@ -311,9 +318,11 @@ struct cdns_pcie_rc { /** * struct cdns_pcie_epf - Structure to hold info about endpoint function + * @epf: Info about virtual functions attached to the physical function * @epf_bar: reference to the pci_epf_bar for the six Base Address Registers */ struct cdns_pcie_epf { + struct cdns_pcie_epf *epf; struct pci_epf_bar *epf_bar[PCI_STD_NUM_BARS]; };