Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 466 insertions, 0 deletions

diff --git a/drivers/fpga/dfl-pci.c b/drivers/fpga/dfl-pci.c
new file mode 100644
index 000000000..0914e7328
--- /dev/null
+++ b/drivers/fpga/dfl-pci.c
@@ -0,0 +1,466 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for FPGA Device Feature List (DFL) PCIe device
+ *
+ * Copyright (C) 2017-2018 Intel Corporation, Inc.
+ *
+ * Authors:
+ *   Zhang Yi <Yi.Z.Zhang@intel.com>
+ *   Xiao Guangrong <guangrong.xiao@linux.intel.com>
+ *   Joseph Grecco <joe.grecco@intel.com>
+ *   Enno Luebbers <enno.luebbers@intel.com>
+ *   Tim Whisonant <tim.whisonant@intel.com>
+ *   Ananda Ravuri <ananda.ravuri@intel.com>
+ *   Henry Mitchel <henry.mitchel@intel.com>
+ */
+
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/stddef.h>
+#include <linux/errno.h>
+#include <linux/aer.h>
+
+#include "dfl.h"
+
+#define DRV_VERSION	"0.8"
+#define DRV_NAME	"dfl-pci"
+
+#define PCI_VSEC_ID_INTEL_DFLS 0x43
+
+#define PCI_VNDR_DFLS_CNT 0x8
+#define PCI_VNDR_DFLS_RES 0xc
+
+#define PCI_VNDR_DFLS_RES_BAR_MASK GENMASK(2, 0)
+#define PCI_VNDR_DFLS_RES_OFF_MASK GENMASK(31, 3)
+
+struct cci_drvdata {
+	struct dfl_fpga_cdev *cdev;	/* container device */
+};
+
+static void __iomem *cci_pci_ioremap_bar0(struct pci_dev *pcidev)
+{
+	if (pcim_iomap_regions(pcidev, BIT(0), DRV_NAME))
+		return NULL;
+
+	return pcim_iomap_table(pcidev)[0];
+}
+
+static int cci_pci_alloc_irq(struct pci_dev *pcidev)
+{
+	int ret, nvec = pci_msix_vec_count(pcidev);
+
+	if (nvec <= 0) {
+		dev_dbg(&pcidev->dev, "fpga interrupt not supported\n");
+		return 0;
+	}
+
+	ret = pci_alloc_irq_vectors(pcidev, nvec, nvec, PCI_IRQ_MSIX);
+	if (ret < 0)
+		return ret;
+
+	return nvec;
+}
+
+static void cci_pci_free_irq(struct pci_dev *pcidev)
+{
+	pci_free_irq_vectors(pcidev);
+}
+
+/* PCI Device ID */
+#define PCIE_DEVICE_ID_PF_INT_5_X		0xBCBD
+#define PCIE_DEVICE_ID_PF_INT_6_X		0xBCC0
+#define PCIE_DEVICE_ID_PF_DSC_1_X		0x09C4
+#define PCIE_DEVICE_ID_INTEL_PAC_N3000		0x0B30
+#define PCIE_DEVICE_ID_INTEL_PAC_D5005		0x0B2B
+#define PCIE_DEVICE_ID_SILICOM_PAC_N5010	0x1000
+#define PCIE_DEVICE_ID_SILICOM_PAC_N5011	0x1001
+#define PCIE_DEVICE_ID_INTEL_DFL		0xbcce
+/* PCI Subdevice ID for PCIE_DEVICE_ID_INTEL_DFL */
+#define PCIE_SUBDEVICE_ID_INTEL_N6000		0x1770
+#define PCIE_SUBDEVICE_ID_INTEL_N6001		0x1771
+#define PCIE_SUBDEVICE_ID_INTEL_C6100		0x17d4
+
+/* VF Device */
+#define PCIE_DEVICE_ID_VF_INT_5_X		0xBCBF
+#define PCIE_DEVICE_ID_VF_INT_6_X		0xBCC1
+#define PCIE_DEVICE_ID_VF_DSC_1_X		0x09C5
+#define PCIE_DEVICE_ID_INTEL_PAC_D5005_VF	0x0B2C
+#define PCIE_DEVICE_ID_INTEL_DFL_VF		0xbccf
+
+static struct pci_device_id cci_pcie_id_tbl[] = {
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_PF_INT_5_X),},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_VF_INT_5_X),},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_PF_INT_6_X),},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_VF_INT_6_X),},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_PF_DSC_1_X),},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_VF_DSC_1_X),},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_PAC_N3000),},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_PAC_D5005),},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_PAC_D5005_VF),},
+	{PCI_DEVICE(PCI_VENDOR_ID_SILICOM_DENMARK, PCIE_DEVICE_ID_SILICOM_PAC_N5010),},
+	{PCI_DEVICE(PCI_VENDOR_ID_SILICOM_DENMARK, PCIE_DEVICE_ID_SILICOM_PAC_N5011),},
+	{PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL,
+			PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_N6000),},
+	{PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL_VF,
+			PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_N6000),},
+	{PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL,
+			PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_N6001),},
+	{PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL_VF,
+			PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_N6001),},
+	{PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL,
+			PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_C6100),},
+	{PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL_VF,
+			PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_C6100),},
+	{0,}
+};
+MODULE_DEVICE_TABLE(pci, cci_pcie_id_tbl);
+
+static int cci_init_drvdata(struct pci_dev *pcidev)
+{
+	struct cci_drvdata *drvdata;
+
+	drvdata = devm_kzalloc(&pcidev->dev, sizeof(*drvdata), GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+
+	pci_set_drvdata(pcidev, drvdata);
+
+	return 0;
+}
+
+static void cci_remove_feature_devs(struct pci_dev *pcidev)
+{
+	struct cci_drvdata *drvdata = pci_get_drvdata(pcidev);
+
+	/* remove all children feature devices */
+	dfl_fpga_feature_devs_remove(drvdata->cdev);
+	cci_pci_free_irq(pcidev);
+}
+
+static int *cci_pci_create_irq_table(struct pci_dev *pcidev, unsigned int nvec)
+{
+	unsigned int i;
+	int *table;
+
+	table = kcalloc(nvec, sizeof(int), GFP_KERNEL);
+	if (!table)
+		return table;
+
+	for (i = 0; i < nvec; i++)
+		table[i] = pci_irq_vector(pcidev, i);
+
+	return table;
+}
+
+static int find_dfls_by_vsec(struct pci_dev *pcidev, struct dfl_fpga_enum_info *info)
+{
+	u32 bir, offset, vndr_hdr, dfl_cnt, dfl_res;
+	int dfl_res_off, i, bars, voff = 0;
+	resource_size_t start, len;
+
+	while ((voff = pci_find_next_ext_capability(pcidev, voff, PCI_EXT_CAP_ID_VNDR))) {
+		vndr_hdr = 0;
+		pci_read_config_dword(pcidev, voff + PCI_VNDR_HEADER, &vndr_hdr);
+
+		if (PCI_VNDR_HEADER_ID(vndr_hdr) == PCI_VSEC_ID_INTEL_DFLS &&
+		    pcidev->vendor == PCI_VENDOR_ID_INTEL)
+			break;
+	}
+
+	if (!voff) {
+		dev_dbg(&pcidev->dev, "%s no DFL VSEC found\n", __func__);
+		return -ENODEV;
+	}
+
+	dfl_cnt = 0;
+	pci_read_config_dword(pcidev, voff + PCI_VNDR_DFLS_CNT, &dfl_cnt);
+	if (dfl_cnt > PCI_STD_NUM_BARS) {
+		dev_err(&pcidev->dev, "%s too many DFLs %d > %d\n",
+			__func__, dfl_cnt, PCI_STD_NUM_BARS);
+		return -EINVAL;
+	}
+
+	dfl_res_off = voff + PCI_VNDR_DFLS_RES;
+	if (dfl_res_off + (dfl_cnt * sizeof(u32)) > PCI_CFG_SPACE_EXP_SIZE) {
+		dev_err(&pcidev->dev, "%s DFL VSEC too big for PCIe config space\n",
+			__func__);
+		return -EINVAL;
+	}
+
+	for (i = 0, bars = 0; i < dfl_cnt; i++, dfl_res_off += sizeof(u32)) {
+		dfl_res = GENMASK(31, 0);
+		pci_read_config_dword(pcidev, dfl_res_off, &dfl_res);
+
+		bir = dfl_res & PCI_VNDR_DFLS_RES_BAR_MASK;
+		if (bir >= PCI_STD_NUM_BARS) {
+			dev_err(&pcidev->dev, "%s bad bir number %d\n",
+				__func__, bir);
+			return -EINVAL;
+		}
+
+		if (bars & BIT(bir)) {
+			dev_err(&pcidev->dev, "%s DFL for BAR %d already specified\n",
+				__func__, bir);
+			return -EINVAL;
+		}
+
+		bars |= BIT(bir);
+
+		len = pci_resource_len(pcidev, bir);
+		offset = dfl_res & PCI_VNDR_DFLS_RES_OFF_MASK;
+		if (offset >= len) {
+			dev_err(&pcidev->dev, "%s bad offset %u >= %pa\n",
+				__func__, offset, &len);
+			return -EINVAL;
+		}
+
+		dev_dbg(&pcidev->dev, "%s BAR %d offset 0x%x\n", __func__, bir, offset);
+
+		len -= offset;
+
+		start = pci_resource_start(pcidev, bir) + offset;
+
+		dfl_fpga_enum_info_add_dfl(info, start, len);
+	}
+
+	return 0;
+}
+
+/* default method of finding dfls starting at offset 0 of bar 0 */
+static int find_dfls_by_default(struct pci_dev *pcidev,
+				struct dfl_fpga_enum_info *info)
+{
+	int port_num, bar, i, ret = 0;
+	resource_size_t start, len;
+	void __iomem *base;
+	u32 offset;
+	u64 v;
+
+	/* start to find Device Feature List from Bar 0 */
+	base = cci_pci_ioremap_bar0(pcidev);
+	if (!base)
+		return -ENOMEM;
+
+	/*
+	 * PF device has FME and Ports/AFUs, and VF device only has one
+	 * Port/AFU. Check them and add related "Device Feature List" info
+	 * for the next step enumeration.
+	 */
+	if (dfl_feature_is_fme(base)) {
+		start = pci_resource_start(pcidev, 0);
+		len = pci_resource_len(pcidev, 0);
+
+		dfl_fpga_enum_info_add_dfl(info, start, len);
+
+		/*
+		 * find more Device Feature Lists (e.g. Ports) per information
+		 * indicated by FME module.
+		 */
+		v = readq(base + FME_HDR_CAP);
+		port_num = FIELD_GET(FME_CAP_NUM_PORTS, v);
+
+		WARN_ON(port_num > MAX_DFL_FPGA_PORT_NUM);
+
+		for (i = 0; i < port_num; i++) {
+			v = readq(base + FME_HDR_PORT_OFST(i));
+
+			/* skip ports which are not implemented. */
+			if (!(v & FME_PORT_OFST_IMP))
+				continue;
+
+			/*
+			 * add Port's Device Feature List information for next
+			 * step enumeration.
+			 */
+			bar = FIELD_GET(FME_PORT_OFST_BAR_ID, v);
+			offset = FIELD_GET(FME_PORT_OFST_DFH_OFST, v);
+			if (bar == FME_PORT_OFST_BAR_SKIP) {
+				continue;
+			} else if (bar >= PCI_STD_NUM_BARS) {
+				dev_err(&pcidev->dev, "bad BAR %d for port %d\n",
+					bar, i);
+				ret = -EINVAL;
+				break;
+			}
+
+			start = pci_resource_start(pcidev, bar) + offset;
+			len = pci_resource_len(pcidev, bar) - offset;
+
+			dfl_fpga_enum_info_add_dfl(info, start, len);
+		}
+	} else if (dfl_feature_is_port(base)) {
+		start = pci_resource_start(pcidev, 0);
+		len = pci_resource_len(pcidev, 0);
+
+		dfl_fpga_enum_info_add_dfl(info, start, len);
+	} else {
+		ret = -ENODEV;
+	}
+
+	/* release I/O mappings for next step enumeration */
+	pcim_iounmap_regions(pcidev, BIT(0));
+
+	return ret;
+}
+
+/* enumerate feature devices under pci device */
+static int cci_enumerate_feature_devs(struct pci_dev *pcidev)
+{
+	struct cci_drvdata *drvdata = pci_get_drvdata(pcidev);
+	struct dfl_fpga_enum_info *info;
+	struct dfl_fpga_cdev *cdev;
+	int nvec, ret = 0;
+	int *irq_table;
+
+	/* allocate enumeration info via pci_dev */
+	info = dfl_fpga_enum_info_alloc(&pcidev->dev);
+	if (!info)
+		return -ENOMEM;
+
+	/* add irq info for enumeration if the device support irq */
+	nvec = cci_pci_alloc_irq(pcidev);
+	if (nvec < 0) {
+		dev_err(&pcidev->dev, "Fail to alloc irq %d.\n", nvec);
+		ret = nvec;
+		goto enum_info_free_exit;
+	} else if (nvec) {
+		irq_table = cci_pci_create_irq_table(pcidev, nvec);
+		if (!irq_table) {
+			ret = -ENOMEM;
+			goto irq_free_exit;
+		}
+
+		ret = dfl_fpga_enum_info_add_irq(info, nvec, irq_table);
+		kfree(irq_table);
+		if (ret)
+			goto irq_free_exit;
+	}
+
+	ret = find_dfls_by_vsec(pcidev, info);
+	if (ret == -ENODEV)
+		ret = find_dfls_by_default(pcidev, info);
+
+	if (ret)
+		goto irq_free_exit;
+
+	/* start enumeration with prepared enumeration information */
+	cdev = dfl_fpga_feature_devs_enumerate(info);
+	if (IS_ERR(cdev)) {
+		dev_err(&pcidev->dev, "Enumeration failure\n");
+		ret = PTR_ERR(cdev);
+		goto irq_free_exit;
+	}
+
+	drvdata->cdev = cdev;
+
+irq_free_exit:
+	if (ret)
+		cci_pci_free_irq(pcidev);
+enum_info_free_exit:
+	dfl_fpga_enum_info_free(info);
+
+	return ret;
+}
+
+static
+int cci_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *pcidevid)
+{
+	int ret;
+
+	ret = pcim_enable_device(pcidev);
+	if (ret < 0) {
+		dev_err(&pcidev->dev, "Failed to enable device %d.\n", ret);
+		return ret;
+	}
+
+	ret = pci_enable_pcie_error_reporting(pcidev);
+	if (ret && ret != -EINVAL)
+		dev_info(&pcidev->dev, "PCIE AER unavailable %d.\n", ret);
+
+	pci_set_master(pcidev);
+
+	ret = dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(64));
+	if (ret)
+		ret = dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(32));
+	if (ret) {
+		dev_err(&pcidev->dev, "No suitable DMA support available.\n");
+		goto disable_error_report_exit;
+	}
+
+	ret = cci_init_drvdata(pcidev);
+	if (ret) {
+		dev_err(&pcidev->dev, "Fail to init drvdata %d.\n", ret);
+		goto disable_error_report_exit;
+	}
+
+	ret = cci_enumerate_feature_devs(pcidev);
+	if (!ret)
+		return ret;
+
+	dev_err(&pcidev->dev, "enumeration failure %d.\n", ret);
+
+disable_error_report_exit:
+	pci_disable_pcie_error_reporting(pcidev);
+	return ret;
+}
+
+static int cci_pci_sriov_configure(struct pci_dev *pcidev, int num_vfs)
+{
+	struct cci_drvdata *drvdata = pci_get_drvdata(pcidev);
+	struct dfl_fpga_cdev *cdev = drvdata->cdev;
+
+	if (!num_vfs) {
+		/*
+		 * disable SRIOV and then put released ports back to default
+		 * PF access mode.
+		 */
+		pci_disable_sriov(pcidev);
+
+		dfl_fpga_cdev_config_ports_pf(cdev);
+
+	} else {
+		int ret;
+
+		/*
+		 * before enable SRIOV, put released ports into VF access mode
+		 * first of all.
+		 */
+		ret = dfl_fpga_cdev_config_ports_vf(cdev, num_vfs);
+		if (ret)
+			return ret;
+
+		ret = pci_enable_sriov(pcidev, num_vfs);
+		if (ret) {
+			dfl_fpga_cdev_config_ports_pf(cdev);
+			return ret;
+		}
+	}
+
+	return num_vfs;
+}
+
+static void cci_pci_remove(struct pci_dev *pcidev)
+{
+	if (dev_is_pf(&pcidev->dev))
+		cci_pci_sriov_configure(pcidev, 0);
+
+	cci_remove_feature_devs(pcidev);
+	pci_disable_pcie_error_reporting(pcidev);
+}
+
+static struct pci_driver cci_pci_driver = {
+	.name = DRV_NAME,
+	.id_table = cci_pcie_id_tbl,
+	.probe = cci_pci_probe,
+	.remove = cci_pci_remove,
+	.sriov_configure = cci_pci_sriov_configure,
+};
+
+module_pci_driver(cci_pci_driver);
+
+MODULE_DESCRIPTION("FPGA DFL PCIe Device Driver");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");