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Message-ID: <20240427113643.GM1981@thinkpad>
Date: Sat, 27 Apr 2024 17:06:43 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Frank Li <Frank.Li@....com>
Cc: Richard Zhu <hongxing.zhu@....com>,
Lucas Stach <l.stach@...gutronix.de>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Krzysztof Wilczyński <kw@...ux.com>,
Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
NXP Linux Team <linux-imx@....com>,
Philipp Zabel <p.zabel@...gutronix.de>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>, linux-pci@...r.kernel.org,
imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH v3 08/11] PCI: imx: Config look up table(LUT) to support
MSI ITS and IOMMU for i.MX95
PCI: imx6: Add support for configuring BDF to SID mapping for i.MX95
On Tue, Apr 02, 2024 at 10:33:44AM -0400, Frank Li wrote:
> i.MX95 need config LUT to convert bpf to stream id. IOMMU and ITS use the
Did you mean BDF? Here and everywhere.
> same stream id. Check msi-map and smmu-map and make sure the same PCI bpf
> map to the same stream id. Then config LUT related registers.
>
These DT properties not documented in the binding.
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
> drivers/pci/controller/dwc/pcie-imx.c | 175 ++++++++++++++++++++++++++++++++++
> 1 file changed, 175 insertions(+)
>
> diff --git a/drivers/pci/controller/dwc/pcie-imx.c b/drivers/pci/controller/dwc/pcie-imx.c
> index af0f960f28757..653d8e8ee1abc 100644
> --- a/drivers/pci/controller/dwc/pcie-imx.c
> +++ b/drivers/pci/controller/dwc/pcie-imx.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 {
> @@ -217,6 +233,159 @@ static int imx95_pcie_init_phy(struct imx_pcie *imx_pcie)
> return 0;
> }
>
> +static int imx_pcie_update_lut(struct imx_pcie *imx_pcie, int index, u16 reqid, u16 mask, u8 sid)
> +{
> + struct dw_pcie *pci = imx_pcie->pci;
> + struct device *dev = pci->dev;
> + u32 data1, data2;
> +
> + if (sid >= 64) {
> + dev_err(dev, "Too big stream id: %d\n", sid);
'Invalid SID for index (%d): %d\n', index, sid
> + return -EINVAL;
> + }
> +
> + 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 = mask;
> + 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, index);
> +
> + return 0;
> +}
> +
> +struct imx_of_map {
imx_iommu_map
> + u32 bdf;
> + u32 phandle;
> + u32 sid;
> + u32 sid_len;
> +};
> +
> +static int imx_check_msi_and_smmmu(struct imx_pcie *imx_pcie,
> + struct imx_of_map *msi_map, u32 msi_size, u32 msi_map_mask,
> + struct imx_of_map *smmu_map, u32 smmu_size, u32 smmu_map_mask)
> +{
> + struct dw_pcie *pci = imx_pcie->pci;
> + struct device *dev = pci->dev;
> + int i;
> +
if (!msi_map || !smmu_map)
return 0;
> + if (msi_map && smmu_map) {
> + if (msi_size != smmu_size)
> + return -EINVAL;
> + if (msi_map_mask != smmu_map_mask)
> + return -EINVAL;
if (msi_size != smmu_size || msi_map_mask != smmu_map_mask)
return -EINVAL;
> +
> + for (i = 0; i < msi_size / sizeof(*msi_map); i++) {
> + if (msi_map->bdf != smmu_map->bdf) {
> + dev_err(dev, "bdf setting is not match\n");
'BDF mismatch between msi-map and iommu-map'
> + return -EINVAL;
> + }
> + if ((msi_map->sid & IMX95_SID_MASK) != smmu_map->sid) {
> + dev_err(dev, "sid setting is not match\n");
'SID mismatch between msi-map and iommu-map'
> + return -EINVAL;
> + }
> + if ((msi_map->sid_len & IMX95_SID_MASK) != smmu_map->sid_len) {
> + dev_err(dev, "sid_len setting is not match\n");
'SID length mismatch between msi-map and iommu-map'
> + return -EINVAL;
> + }
> + }
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * Simple static config lut according to dts settings DAC index and stream ID used as a match result
> + * of LUT pre-allocated and used by PCIes.
> + *
Please reword the above sentence.
> + * Currently stream ID from 32-64 for PCIe.
> + * 32-40: first PCI bus.
> + * 40-48: second PCI bus.
I believe this is an SoC specific info. So better not add it here. It belongs to
DT.
> + *
> + * DAC_ID is index of TRDC.DAC index, start from 2 at iMX95.
> + * ITS [pci(2bit): streamid(6bits)]
> + * pci 0 is 0
> + * pci 1 is 3
> + */
> +static int imx_pcie_config_sid(struct imx_pcie *imx_pcie)
> +{
> + struct imx_of_map *msi_map = NULL, *smmu_map = NULL, *cur;
> + int i, j, lut_index, nr_map, msi_size = 0, smmu_size = 0;
> + u32 msi_map_mask = 0xffff, smmu_map_mask = 0xffff;
> + struct dw_pcie *pci = imx_pcie->pci;
> + struct device *dev = pci->dev;
> + u32 mask;
> + int size;
> +
> + of_get_property(dev->of_node, "msi-map", &msi_size);
> + if (msi_size) {
You mentioned in the commit message that msi-map and iommu-map needs to be the
same for this SoC. But here you are just ignoring the absence of 'msi-map'
property.
> + msi_map = devm_kzalloc(dev, msi_size, GFP_KERNEL);
> + if (!msi_map)
> + return -ENOMEM;
> +
> + if (of_property_read_u32_array(dev->of_node, "msi-map", (u32 *)msi_map,
> + msi_size / sizeof(u32)))
> + return -EINVAL;
> +
> + of_property_read_u32(dev->of_node, "msi-map-mask", &msi_map_mask);
> + }
> +
> + cur = msi_map;
> + size = msi_size;
> + mask = msi_map_mask;
> +
> + of_get_property(dev->of_node, "iommu-map", &smmu_size);
Same comment as above.
> + if (smmu_size) {
> + smmu_map = devm_kzalloc(dev, smmu_size, GFP_KERNEL);
> + if (!smmu_map)
> + return -ENOMEM;
> +
> + if (of_property_read_u32_array(dev->of_node, "iommu-map", (u32 *)smmu_map,
> + smmu_size / sizeof(u32)))
> + return -EINVAL;
> +
> + of_property_read_u32(dev->of_node, "iommu_map_mask", &smmu_map_mask);
> + }
> +
> + if (imx_check_msi_and_smmmu(imx_pcie, msi_map, msi_size, msi_map_mask,
> + smmu_map, smmu_size, smmu_map_mask))
> + return -EINVAL;
> +
Hmm, so you want to continue even if the 'msi-map' and 'iommu-map' properties
don't exist i.e., for old platforms?
> + if (!cur) {
> + cur = smmu_map;
> + size = smmu_size;
> + mask = smmu_map_mask;
> + }
> +
> + nr_map = size / (sizeof(*cur));
> +
> + lut_index = 0;
Just initialize it while defining itself.
> + for (i = 0; i < nr_map; i++) {
> + for (j = 0; j < cur->sid_len; j++) {
> + imx_pcie_update_lut(imx_pcie, lut_index, cur->bdf + j, mask,
> + (cur->sid + j) & IMX95_SID_MASK);
> + lut_index++;
> + }
> + cur++;
> +
> + if (lut_index >= IMX95_MAX_LUT) {
> + dev_err(dev, "its-map/iommu-map exceed HW limiation\n");
'Too many msi-map/iommu-map entries'
But I think you can just continue to use the allowed entries.
> + return -EINVAL;
> + }
> + }
> +
> + devm_kfree(dev, smmu_map);
> + devm_kfree(dev, msi_map);
Please don't explicitly free the devm_ managed resources unless really needed.
Else don't use devm_ at all.
> +
> + return 0;
> +}
> +
> static void imx_pcie_configure_type(struct imx_pcie *imx_pcie)
> {
> const struct imx_pcie_drvdata *drvdata = imx_pcie->drvdata;
> @@ -950,6 +1119,12 @@ static int imx_pcie_host_init(struct dw_pcie_rp *pp)
> goto err_phy_off;
> }
>
> + ret = imx_pcie_config_sid(imx_pcie);
> + if (ret < 0) {
> + dev_err(dev, "failed to config sid:%d\n", ret);
'Failed to config BDF to SID mapping: %d\n'
- Mani
--
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