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Sat, 02 Nov 2024 04:49:45 -0700 (PDT) Received: from thinkpad ([220.158.156.192]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-720bc1e5839sm4022440b3a.68.2024.11.02.04.49.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 02 Nov 2024 04:49:44 -0700 (PDT) Date: Sat, 2 Nov 2024 17:19:37 +0530 From: Manivannan Sadhasivam To: Frank Li Cc: Bjorn Helgaas , Richard Zhu , Lucas Stach , Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Rob Herring , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, imx@lists.linux.dev, alyssa@rosenzweig.io, bpf@vger.kernel.org, broonie@kernel.org, jgg@ziepe.ca, joro@8bytes.org, lgirdwood@gmail.com, maz@kernel.org, p.zabel@pengutronix.de, robin.murphy@arm.com, will@kernel.org Subject: Re: [PATCH v3 2/2] PCI: imx6: Add IOMMU and ITS MSI support for i.MX95 Message-ID: <20241102114937.w7jt7n7zr3ext5jo@thinkpad> References: <20241024-imx95_lut-v3-0-7509c9bbab86@nxp.com> <20241024-imx95_lut-v3-2-7509c9bbab86@nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20241024-imx95_lut-v3-2-7509c9bbab86@nxp.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241102_044946_398219_913A7B07 X-CRM114-Status: GOOD ( 38.90 ) 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 On Thu, Oct 24, 2024 at 06:34:45PM -0400, Frank Li wrote: > For the i.MX95, configuration of a LUT is necessary to convert Bus Device > Function (BDF) to stream IDs, which are utilized by both IOMMU and ITS. > This involves examining the msi-map and smmu-map to ensure consistent > mapping of PCI BDF to the same stream IDs. Subsequently, LUT-related > registers are configured. In the absence of an msi-map, the built-in MSI > controller is utilized as a fallback. > > Additionally, register a PCI bus callback function enable_device() and > disable_device() to config LUT when enable a new PCI device. > Callbacks are not *addition*, but it is how you are implementing the LUT configuration. Please reword it so. > Signed-off-by: Frank Li > --- > Change from v2 to v3 > - Use the "target" argument of of_map_id() > - Check if rid already in lut table when enable device > > change from v1 to v2 > - set callback to pci_host_bridge instead pci->ops. > --- > drivers/pci/controller/dwc/pci-imx6.c | 159 +++++++++++++++++++++++++++++++++- > 1 file changed, 158 insertions(+), 1 deletion(-) > > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c > index 94f3411352bf0..95f06bfb9fc5e 100644 > --- a/drivers/pci/controller/dwc/pci-imx6.c > +++ b/drivers/pci/controller/dwc/pci-imx6.c > @@ -55,6 +55,22 @@ > #define IMX95_PE0_GEN_CTRL_3 0x1058 > #define IMX95_PCIE_LTSSM_EN BIT(0) > > +#define IMX95_PE0_LUT_ACSCTRL 0x1008 > +#define IMX95_PEO_LUT_RWA BIT(16) > +#define IMX95_PE0_LUT_ENLOC GENMASK(4, 0) > + > +#define IMX95_PE0_LUT_DATA1 0x100c > +#define IMX95_PE0_LUT_VLD BIT(31) > +#define IMX95_PE0_LUT_DAC_ID GENMASK(10, 8) > +#define IMX95_PE0_LUT_STREAM_ID GENMASK(5, 0) > + > +#define IMX95_PE0_LUT_DATA2 0x1010 > +#define IMX95_PE0_LUT_REQID GENMASK(31, 16) > +#define IMX95_PE0_LUT_MASK GENMASK(15, 0) > + > +#define IMX95_SID_MASK GENMASK(5, 0) > +#define IMX95_MAX_LUT 32 > + > #define to_imx_pcie(x) dev_get_drvdata((x)->dev) > > enum imx_pcie_variants { > @@ -82,6 +98,7 @@ enum imx_pcie_variants { > #define IMX_PCIE_FLAG_HAS_PHY_RESET BIT(5) > #define IMX_PCIE_FLAG_HAS_SERDES BIT(6) > #define IMX_PCIE_FLAG_SUPPORT_64BIT BIT(7) > +#define IMX_PCIE_FLAG_HAS_LUT BIT(8) > > #define imx_check_flag(pci, val) (pci->drvdata->flags & val) > > @@ -134,6 +151,7 @@ struct imx_pcie { > struct device *pd_pcie_phy; > struct phy *phy; > const struct imx_pcie_drvdata *drvdata; > + struct mutex lock; Please add a comment on what the lock is guarding. > }; > > /* Parameters for the waiting for PCIe PHY PLL to lock on i.MX7 */ > @@ -925,6 +943,137 @@ static void imx_pcie_stop_link(struct dw_pcie *pci) > imx_pcie_ltssm_disable(dev); > } > > +static int imx_pcie_add_lut(struct imx_pcie *imx_pcie, u16 reqid, u8 sid) s/reqid/rid > +{ > + struct dw_pcie *pci = imx_pcie->pci; > + struct device *dev = pci->dev; > + u32 data1, data2; > + int i; > + > + if (sid >= 64) { > + dev_err(dev, "Invalid SID for index %d\n", sid); > + return -EINVAL; > + } > + > + guard(mutex)(&imx_pcie->lock); > + > + for (i = 0; i < IMX95_MAX_LUT; i++) { > + regmap_write(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_ACSCTRL, IMX95_PEO_LUT_RWA | i); > + regmap_read(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_DATA1, &data1); > + > + if (!(data1 & IMX95_PE0_LUT_VLD)) > + continue; > + > + regmap_read(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_DATA2, &data2); > + > + /* Needn't add duplicated Request ID */ > + if (reqid == FIELD_GET(IMX95_PE0_LUT_REQID, data2)) So this means LUT entry is already present for the given RID (a buggy DT maybe). Don't you need to emit a warning here? > + return 0; > + } > + You need to bail out here if no free LUT entry is available. But I'd recommend to combine two loops to avoid having duplicated IMX95_PE0_LUT_VLD checks and program LUT only if there is any free entry available. > + for (i = 0; i < IMX95_MAX_LUT; i++) { > + regmap_write(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_ACSCTRL, IMX95_PEO_LUT_RWA | i); > + > + regmap_read(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_DATA1, &data1); > + if (data1 & IMX95_PE0_LUT_VLD) > + continue; > + > + data1 = FIELD_PREP(IMX95_PE0_LUT_DAC_ID, 0); > + data1 |= FIELD_PREP(IMX95_PE0_LUT_STREAM_ID, sid); > + data1 |= IMX95_PE0_LUT_VLD; > + > + regmap_write(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_DATA1, data1); > + > + data2 = 0xffff; data2 = IMX95_PE0_LUT_MASK; Also add a comment on why the mask is added along with the RID. > + data2 |= FIELD_PREP(IMX95_PE0_LUT_REQID, reqid); > + > + regmap_write(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_DATA2, data2); > + > + regmap_write(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_ACSCTRL, i); > + > + return 0; > + } > + > + dev_err(dev, "All lut already used\n"); "LUT entry is not available" > + return -EINVAL; > +} > + > +static void imx_pcie_remove_lut(struct imx_pcie *imx_pcie, u16 reqid) s/reqid/rid > +{ > + u32 data2 = 0; No need to initialize. > + int i; > + > + guard(mutex)(&imx_pcie->lock); > + > + for (i = 0; i < IMX95_MAX_LUT; i++) { > + regmap_write(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_ACSCTRL, IMX95_PEO_LUT_RWA | i); > + > + regmap_read(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_DATA2, &data2); > + if (FIELD_GET(IMX95_PE0_LUT_REQID, data2) == reqid) { > + regmap_write(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_DATA1, 0); > + regmap_write(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_DATA2, 0); > + regmap_write(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_ACSCTRL, i); > + > + break; > + } > + } > +} > + > +static int imx_pcie_enable_device(struct pci_host_bridge *bridge, struct pci_dev *pdev) > +{ > + u32 sid_i = 0, sid_m = 0, rid = pci_dev_id(pdev); > + struct device_node *target; > + struct imx_pcie *imx_pcie; > + struct device *dev; > + int err_i, err_m; > + > + imx_pcie = to_imx_pcie(to_dw_pcie_from_pp(bridge->sysdata)); > + dev = imx_pcie->pci->dev; You can assign these at initialization time. > + > + target = NULL; > + err_i = of_map_id(dev->of_node, rid, "iommu-map", "iommu-map-mask", &target, &sid_i); > + target = NULL; What is the point in passing 'target' here? > + err_m = of_map_id(dev->of_node, rid, "msi-map", "msi-map-mask", &target, &sid_m); > + > + > + /* > + * msi-map iommu-map > + * Y Y ITS + SMMU, require the same sid > + * Y N ITS > + * N Y DWC MSI Ctrl + SMMU > + * N N DWC MSI Ctrl > + */ > + if (!err_i && !err_m) > + if ((sid_i & IMX95_SID_MASK) != (sid_m & IMX95_SID_MASK)) { > + dev_err(dev, "its and iommu stream id miss match, please check dts file\n"); "iommu-map and msi-map entries mismatch!" - Mani -- மணிவண்ணன் சதாசிவம்