1 // SPDX-License-Identifier: GPL-2.0
3 * Driver for FPGA Device Feature List (DFL) PCIe device
5 * Copyright (C) 2017-2018 Intel Corporation, Inc.
8 * Zhang Yi <Yi.Z.Zhang@intel.com>
9 * Xiao Guangrong <guangrong.xiao@linux.intel.com>
10 * Joseph Grecco <joe.grecco@intel.com>
11 * Enno Luebbers <enno.luebbers@intel.com>
12 * Tim Whisonant <tim.whisonant@intel.com>
13 * Ananda Ravuri <ananda.ravuri@intel.com>
14 * Henry Mitchel <henry.mitchel@intel.com>
17 #include <linux/pci.h>
18 #include <linux/types.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/stddef.h>
22 #include <linux/errno.h>
23 #include <linux/aer.h>
27 #define DRV_VERSION "0.8"
28 #define DRV_NAME "dfl-pci"
31 struct dfl_fpga_cdev *cdev; /* container device */
34 static void __iomem *cci_pci_ioremap_bar(struct pci_dev *pcidev, int bar)
36 if (pcim_iomap_regions(pcidev, BIT(bar), DRV_NAME))
39 return pcim_iomap_table(pcidev)[bar];
42 static int cci_pci_alloc_irq(struct pci_dev *pcidev)
44 int ret, nvec = pci_msix_vec_count(pcidev);
47 dev_dbg(&pcidev->dev, "fpga interrupt not supported\n");
51 ret = pci_alloc_irq_vectors(pcidev, nvec, nvec, PCI_IRQ_MSIX);
58 static void cci_pci_free_irq(struct pci_dev *pcidev)
60 pci_free_irq_vectors(pcidev);
64 #define PCIE_DEVICE_ID_PF_INT_5_X 0xBCBD
65 #define PCIE_DEVICE_ID_PF_INT_6_X 0xBCC0
66 #define PCIE_DEVICE_ID_PF_DSC_1_X 0x09C4
67 #define PCIE_DEVICE_ID_INTEL_PAC_N3000 0x0B30
69 #define PCIE_DEVICE_ID_VF_INT_5_X 0xBCBF
70 #define PCIE_DEVICE_ID_VF_INT_6_X 0xBCC1
71 #define PCIE_DEVICE_ID_VF_DSC_1_X 0x09C5
73 static struct pci_device_id cci_pcie_id_tbl[] = {
74 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_PF_INT_5_X),},
75 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_VF_INT_5_X),},
76 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_PF_INT_6_X),},
77 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_VF_INT_6_X),},
78 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_PF_DSC_1_X),},
79 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_VF_DSC_1_X),},
80 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_PAC_N3000),},
83 MODULE_DEVICE_TABLE(pci, cci_pcie_id_tbl);
85 static int cci_init_drvdata(struct pci_dev *pcidev)
87 struct cci_drvdata *drvdata;
89 drvdata = devm_kzalloc(&pcidev->dev, sizeof(*drvdata), GFP_KERNEL);
93 pci_set_drvdata(pcidev, drvdata);
98 static void cci_remove_feature_devs(struct pci_dev *pcidev)
100 struct cci_drvdata *drvdata = pci_get_drvdata(pcidev);
102 /* remove all children feature devices */
103 dfl_fpga_feature_devs_remove(drvdata->cdev);
104 cci_pci_free_irq(pcidev);
107 static int *cci_pci_create_irq_table(struct pci_dev *pcidev, unsigned int nvec)
112 table = kcalloc(nvec, sizeof(int), GFP_KERNEL);
116 for (i = 0; i < nvec; i++)
117 table[i] = pci_irq_vector(pcidev, i);
122 /* enumerate feature devices under pci device */
123 static int cci_enumerate_feature_devs(struct pci_dev *pcidev)
125 struct cci_drvdata *drvdata = pci_get_drvdata(pcidev);
126 int port_num, bar, i, nvec, ret = 0;
127 struct dfl_fpga_enum_info *info;
128 struct dfl_fpga_cdev *cdev;
129 resource_size_t start, len;
135 /* allocate enumeration info via pci_dev */
136 info = dfl_fpga_enum_info_alloc(&pcidev->dev);
140 /* add irq info for enumeration if the device support irq */
141 nvec = cci_pci_alloc_irq(pcidev);
143 dev_err(&pcidev->dev, "Fail to alloc irq %d.\n", nvec);
145 goto enum_info_free_exit;
147 irq_table = cci_pci_create_irq_table(pcidev, nvec);
153 ret = dfl_fpga_enum_info_add_irq(info, nvec, irq_table);
159 /* start to find Device Feature List from Bar 0 */
160 base = cci_pci_ioremap_bar(pcidev, 0);
167 * PF device has FME and Ports/AFUs, and VF device only has one
168 * Port/AFU. Check them and add related "Device Feature List" info
169 * for the next step enumeration.
171 if (dfl_feature_is_fme(base)) {
172 start = pci_resource_start(pcidev, 0);
173 len = pci_resource_len(pcidev, 0);
175 dfl_fpga_enum_info_add_dfl(info, start, len, base);
178 * find more Device Feature Lists (e.g. Ports) per information
179 * indicated by FME module.
181 v = readq(base + FME_HDR_CAP);
182 port_num = FIELD_GET(FME_CAP_NUM_PORTS, v);
184 WARN_ON(port_num > MAX_DFL_FPGA_PORT_NUM);
186 for (i = 0; i < port_num; i++) {
187 v = readq(base + FME_HDR_PORT_OFST(i));
189 /* skip ports which are not implemented. */
190 if (!(v & FME_PORT_OFST_IMP))
194 * add Port's Device Feature List information for next
197 bar = FIELD_GET(FME_PORT_OFST_BAR_ID, v);
198 offset = FIELD_GET(FME_PORT_OFST_DFH_OFST, v);
199 base = cci_pci_ioremap_bar(pcidev, bar);
203 start = pci_resource_start(pcidev, bar) + offset;
204 len = pci_resource_len(pcidev, bar) - offset;
206 dfl_fpga_enum_info_add_dfl(info, start, len,
209 } else if (dfl_feature_is_port(base)) {
210 start = pci_resource_start(pcidev, 0);
211 len = pci_resource_len(pcidev, 0);
213 dfl_fpga_enum_info_add_dfl(info, start, len, base);
219 /* start enumeration with prepared enumeration information */
220 cdev = dfl_fpga_feature_devs_enumerate(info);
222 dev_err(&pcidev->dev, "Enumeration failure\n");
227 drvdata->cdev = cdev;
231 cci_pci_free_irq(pcidev);
233 dfl_fpga_enum_info_free(info);
239 int cci_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *pcidevid)
243 ret = pcim_enable_device(pcidev);
245 dev_err(&pcidev->dev, "Failed to enable device %d.\n", ret);
249 ret = pci_enable_pcie_error_reporting(pcidev);
250 if (ret && ret != -EINVAL)
251 dev_info(&pcidev->dev, "PCIE AER unavailable %d.\n", ret);
253 pci_set_master(pcidev);
255 if (!pci_set_dma_mask(pcidev, DMA_BIT_MASK(64))) {
256 ret = pci_set_consistent_dma_mask(pcidev, DMA_BIT_MASK(64));
258 goto disable_error_report_exit;
259 } else if (!pci_set_dma_mask(pcidev, DMA_BIT_MASK(32))) {
260 ret = pci_set_consistent_dma_mask(pcidev, DMA_BIT_MASK(32));
262 goto disable_error_report_exit;
265 dev_err(&pcidev->dev, "No suitable DMA support available.\n");
266 goto disable_error_report_exit;
269 ret = cci_init_drvdata(pcidev);
271 dev_err(&pcidev->dev, "Fail to init drvdata %d.\n", ret);
272 goto disable_error_report_exit;
275 ret = cci_enumerate_feature_devs(pcidev);
279 dev_err(&pcidev->dev, "enumeration failure %d.\n", ret);
281 disable_error_report_exit:
282 pci_disable_pcie_error_reporting(pcidev);
286 static int cci_pci_sriov_configure(struct pci_dev *pcidev, int num_vfs)
288 struct cci_drvdata *drvdata = pci_get_drvdata(pcidev);
289 struct dfl_fpga_cdev *cdev = drvdata->cdev;
293 * disable SRIOV and then put released ports back to default
296 pci_disable_sriov(pcidev);
298 dfl_fpga_cdev_config_ports_pf(cdev);
304 * before enable SRIOV, put released ports into VF access mode
307 ret = dfl_fpga_cdev_config_ports_vf(cdev, num_vfs);
311 ret = pci_enable_sriov(pcidev, num_vfs);
313 dfl_fpga_cdev_config_ports_pf(cdev);
321 static void cci_pci_remove(struct pci_dev *pcidev)
323 if (dev_is_pf(&pcidev->dev))
324 cci_pci_sriov_configure(pcidev, 0);
326 cci_remove_feature_devs(pcidev);
327 pci_disable_pcie_error_reporting(pcidev);
330 static struct pci_driver cci_pci_driver = {
332 .id_table = cci_pcie_id_tbl,
333 .probe = cci_pci_probe,
334 .remove = cci_pci_remove,
335 .sriov_configure = cci_pci_sriov_configure,
338 module_pci_driver(cci_pci_driver);
340 MODULE_DESCRIPTION("FPGA DFL PCIe Device Driver");
341 MODULE_AUTHOR("Intel Corporation");
342 MODULE_LICENSE("GPL v2");