| Message ID | 20241101-imx95_lut-v4-2-0fdf9a2fe754@nxp.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | PCI: add enabe(disable)_device() hook for bridge | expand |
| Context | Check | Description |
|---|---|---|
| netdev/tree_selection | success | Not a local patch |
> -----Original Message----- > From: Frank Li <frank.li@nxp.com> > Sent: 2024年11月2日 5:05 > To: Bjorn Helgaas <bhelgaas@google.com>; Hongxing Zhu > <hongxing.zhu@nxp.com>; Lucas Stach <l.stach@pengutronix.de>; Lorenzo > Pieralisi <lpieralisi@kernel.org>; Krzysztof Wilczyński <kw@linux.com>; > Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>; Rob Herring > <robh@kernel.org>; Shawn Guo <shawnguo@kernel.org>; Sascha Hauer > <s.hauer@pengutronix.de>; Pengutronix Kernel Team > <kernel@pengutronix.de>; Fabio Estevam <festevam@gmail.com> > Cc: linux-pci@vger.kernel.org; linux-kernel@vger.kernel.org; > linux-arm-kernel@lists.infradead.org; imx@lists.linux.dev; Frank Li > <frank.li@nxp.com>; alyssa@rosenzweig.io; bpf@vger.kernel.org; > broonie@kernel.org; jgg@ziepe.ca; joro@8bytes.org; l.stach@pengutronix.de; > lgirdwood@gmail.com; maz@kernel.org; p.zabel@pengutronix.de; > robin.murphy@arm.com; will@kernel.org; Robin Murphy > <robin.murphy@arm.com>; Frank Li <frank.li@nxp.com> > Subject: [PATCH v4 2/2] PCI: imx6: Add IOMMU and ITS MSI support for > i.MX95 > > 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. > > Signed-off-by: Frank Li <Frank.Li@nxp.com> Acked-by: Richard Zhu <hongxing.zhu@nxp.com> Best Regards Richard Zhu > --- > Change from v3 to v4 > - Check target value at of_map_id(). > - of_node_put() for target. > - add case for msi-map exist, but rid entry is not exist. > > 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 | 177 > +++++++++++++++++++++++++++++++++- > 1 file changed, 176 insertions(+), 1 deletion(-) > > diff --git a/drivers/pci/controller/dwc/pci-imx6.c > b/drivers/pci/controller/dwc/pci-imx6.c > index 94f3411352bf0..1be17bc39ce54 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; > }; > > /* Parameters for the waiting for PCIe PHY PLL to lock on i.MX7 */ @@ > -925,6 +943,155 @@ 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) { > + 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)) > + return 0; > + } > + > + 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 |= 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"); > + return -EINVAL; > +} > + > +static void imx_pcie_remove_lut(struct imx_pcie *imx_pcie, u16 reqid) { > + u32 data2 = 0; > + 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; > + > + target = NULL; > + err_i = of_map_id(dev->of_node, rid, "iommu-map", "iommu-map-mask", > &target, &sid_i); > + if (target) > + of_node_put(target); > + else > + err_i = -EINVAL; > + > + target = NULL; > + err_m = of_map_id(dev->of_node, rid, "msi-map", "msi-map-mask", > +&target, &sid_m); > + > + /* > + * Return failure if msi-map exist and no entry for rid because dwc > common > + * driver will skip setting up built-in MSI controller if msi-map existed. > + * > + * err_m target > + * 0 NULL Return failure, function not work. > + * !0 NULL msi-map not exist, use built-in MSI. > + * 0 !NULL Find one entry. > + * !0 !NULL Invalidate case. > + */ > + if (!err_m && !target) > + return -EINVAL; > + else if (target) > + of_node_put(target); /* Find entry for rid in msi-map */ > + > + /* > + * 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"); > + return -EINVAL; > + } > + > + /* > + * Both iommu-map and msi-map not exist, use dwc built-in MSI > + * controller, do nothing here. > + */ > + if (err_i && err_m) > + return 0; > + > + if (!err_i) > + return imx_pcie_add_lut(imx_pcie, rid, sid_i); > + else if (!err_m) > + /* Hardware auto add 2 bit controller id ahead of stream ID */ > + return imx_pcie_add_lut(imx_pcie, rid, sid_m & IMX95_SID_MASK); > + > + return 0; > +} > + > +static void imx_pcie_disable_device(struct pci_host_bridge *bridge, > +struct pci_dev *pdev) { > + struct imx_pcie *imx_pcie; > + > + imx_pcie = to_imx_pcie(to_dw_pcie_from_pp(bridge->sysdata)); > + imx_pcie_remove_lut(imx_pcie, pci_dev_id(pdev)); } > + > static int imx_pcie_host_init(struct dw_pcie_rp *pp) { > struct dw_pcie *pci = to_dw_pcie_from_pp(pp); @@ -941,6 +1108,11 > @@ static int imx_pcie_host_init(struct dw_pcie_rp *pp) > } > } > > + if (pp->bridge && imx_check_flag(imx_pcie, IMX_PCIE_FLAG_HAS_LUT)) > { > + pp->bridge->enable_device = imx_pcie_enable_device; > + pp->bridge->disable_device = imx_pcie_disable_device; > + } > + > imx_pcie_assert_core_reset(imx_pcie); > > if (imx_pcie->drvdata->init_phy) > @@ -1292,6 +1464,8 @@ static int imx_pcie_probe(struct platform_device > *pdev) > imx_pcie->pci = pci; > imx_pcie->drvdata = of_device_get_match_data(dev); > > + mutex_init(&imx_pcie->lock); > + > /* Find the PHY if one is defined, only imx7d uses it */ > np = of_parse_phandle(node, "fsl,imx7d-pcie-phy", 0); > if (np) { > @@ -1587,7 +1761,8 @@ static const struct imx_pcie_drvdata drvdata[] = { > }, > [IMX95] = { > .variant = IMX95, > - .flags = IMX_PCIE_FLAG_HAS_SERDES, > + .flags = IMX_PCIE_FLAG_HAS_SERDES | > + IMX_PCIE_FLAG_HAS_LUT, > .clk_names = imx8mq_clks, > .clks_cnt = ARRAY_SIZE(imx8mq_clks), > .ltssm_off = IMX95_PE0_GEN_CTRL_3, > > -- > 2.34.1
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 94f3411352bf0..1be17bc39ce54 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; }; /* Parameters for the waiting for PCIe PHY PLL to lock on i.MX7 */ @@ -925,6 +943,155 @@ 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) +{ + 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)) + return 0; + } + + 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 |= 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"); + return -EINVAL; +} + +static void imx_pcie_remove_lut(struct imx_pcie *imx_pcie, u16 reqid) +{ + u32 data2 = 0; + 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; + + target = NULL; + err_i = of_map_id(dev->of_node, rid, "iommu-map", "iommu-map-mask", &target, &sid_i); + if (target) + of_node_put(target); + else + err_i = -EINVAL; + + target = NULL; + err_m = of_map_id(dev->of_node, rid, "msi-map", "msi-map-mask", &target, &sid_m); + + /* + * Return failure if msi-map exist and no entry for rid because dwc common + * driver will skip setting up built-in MSI controller if msi-map existed. + * + * err_m target + * 0 NULL Return failure, function not work. + * !0 NULL msi-map not exist, use built-in MSI. + * 0 !NULL Find one entry. + * !0 !NULL Invalidate case. + */ + if (!err_m && !target) + return -EINVAL; + else if (target) + of_node_put(target); /* Find entry for rid in msi-map */ + + /* + * 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"); + return -EINVAL; + } + + /* + * Both iommu-map and msi-map not exist, use dwc built-in MSI + * controller, do nothing here. + */ + if (err_i && err_m) + return 0; + + if (!err_i) + return imx_pcie_add_lut(imx_pcie, rid, sid_i); + else if (!err_m) + /* Hardware auto add 2 bit controller id ahead of stream ID */ + return imx_pcie_add_lut(imx_pcie, rid, sid_m & IMX95_SID_MASK); + + return 0; +} + +static void imx_pcie_disable_device(struct pci_host_bridge *bridge, struct pci_dev *pdev) +{ + struct imx_pcie *imx_pcie; + + imx_pcie = to_imx_pcie(to_dw_pcie_from_pp(bridge->sysdata)); + imx_pcie_remove_lut(imx_pcie, pci_dev_id(pdev)); +} + static int imx_pcie_host_init(struct dw_pcie_rp *pp) { struct dw_pcie *pci = to_dw_pcie_from_pp(pp); @@ -941,6 +1108,11 @@ static int imx_pcie_host_init(struct dw_pcie_rp *pp) } } + if (pp->bridge && imx_check_flag(imx_pcie, IMX_PCIE_FLAG_HAS_LUT)) { + pp->bridge->enable_device = imx_pcie_enable_device; + pp->bridge->disable_device = imx_pcie_disable_device; + } + imx_pcie_assert_core_reset(imx_pcie); if (imx_pcie->drvdata->init_phy) @@ -1292,6 +1464,8 @@ static int imx_pcie_probe(struct platform_device *pdev) imx_pcie->pci = pci; imx_pcie->drvdata = of_device_get_match_data(dev); + mutex_init(&imx_pcie->lock); + /* Find the PHY if one is defined, only imx7d uses it */ np = of_parse_phandle(node, "fsl,imx7d-pcie-phy", 0); if (np) { @@ -1587,7 +1761,8 @@ static const struct imx_pcie_drvdata drvdata[] = { }, [IMX95] = { .variant = IMX95, - .flags = IMX_PCIE_FLAG_HAS_SERDES, + .flags = IMX_PCIE_FLAG_HAS_SERDES | + IMX_PCIE_FLAG_HAS_LUT, .clk_names = imx8mq_clks, .clks_cnt = ARRAY_SIZE(imx8mq_clks), .ltssm_off = IMX95_PE0_GEN_CTRL_3,
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. Signed-off-by: Frank Li <Frank.Li@nxp.com> --- Change from v3 to v4 - Check target value at of_map_id(). - of_node_put() for target. - add case for msi-map exist, but rid entry is not exist. 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 | 177 +++++++++++++++++++++++++++++++++- 1 file changed, 176 insertions(+), 1 deletion(-)