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/dma-mapping.h>
19 #include <linux/types.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/stddef.h>
23 #include <linux/errno.h>
27 #define DRV_VERSION "0.8"
28 #define DRV_NAME "dfl-pci"
30 #define PCI_VSEC_ID_INTEL_DFLS 0x43
32 #define PCI_VNDR_DFLS_CNT 0x8
33 #define PCI_VNDR_DFLS_RES 0xc
35 #define PCI_VNDR_DFLS_RES_BAR_MASK GENMASK(2, 0)
36 #define PCI_VNDR_DFLS_RES_OFF_MASK GENMASK(31, 3)
39 struct dfl_fpga_cdev *cdev; /* container device */
42 static void __iomem *cci_pci_ioremap_bar0(struct pci_dev *pcidev)
44 if (pcim_iomap_regions(pcidev, BIT(0), DRV_NAME))
47 return pcim_iomap_table(pcidev)[0];
50 static int cci_pci_alloc_irq(struct pci_dev *pcidev)
52 int ret, nvec = pci_msix_vec_count(pcidev);
55 dev_dbg(&pcidev->dev, "fpga interrupt not supported\n");
59 ret = pci_alloc_irq_vectors(pcidev, nvec, nvec, PCI_IRQ_MSIX);
66 static void cci_pci_free_irq(struct pci_dev *pcidev)
68 pci_free_irq_vectors(pcidev);
72 #define PCIE_DEVICE_ID_PF_INT_5_X 0xBCBD
73 #define PCIE_DEVICE_ID_PF_INT_6_X 0xBCC0
74 #define PCIE_DEVICE_ID_PF_DSC_1_X 0x09C4
75 #define PCIE_DEVICE_ID_INTEL_PAC_N3000 0x0B30
76 #define PCIE_DEVICE_ID_INTEL_PAC_D5005 0x0B2B
77 #define PCIE_DEVICE_ID_SILICOM_PAC_N5010 0x1000
78 #define PCIE_DEVICE_ID_SILICOM_PAC_N5011 0x1001
79 #define PCIE_DEVICE_ID_INTEL_DFL 0xbcce
80 /* PCI Subdevice ID for PCIE_DEVICE_ID_INTEL_DFL */
81 #define PCIE_SUBDEVICE_ID_INTEL_D5005 0x138d
82 #define PCIE_SUBDEVICE_ID_INTEL_N6000 0x1770
83 #define PCIE_SUBDEVICE_ID_INTEL_N6001 0x1771
84 #define PCIE_SUBDEVICE_ID_INTEL_C6100 0x17d4
87 #define PCIE_DEVICE_ID_VF_INT_5_X 0xBCBF
88 #define PCIE_DEVICE_ID_VF_INT_6_X 0xBCC1
89 #define PCIE_DEVICE_ID_VF_DSC_1_X 0x09C5
90 #define PCIE_DEVICE_ID_INTEL_PAC_D5005_VF 0x0B2C
91 #define PCIE_DEVICE_ID_INTEL_DFL_VF 0xbccf
93 static struct pci_device_id cci_pcie_id_tbl[] = {
94 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_PF_INT_5_X),},
95 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_VF_INT_5_X),},
96 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_PF_INT_6_X),},
97 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_VF_INT_6_X),},
98 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_PF_DSC_1_X),},
99 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_VF_DSC_1_X),},
100 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_PAC_N3000),},
101 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_PAC_D5005),},
102 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_PAC_D5005_VF),},
103 {PCI_DEVICE(PCI_VENDOR_ID_SILICOM_DENMARK, PCIE_DEVICE_ID_SILICOM_PAC_N5010),},
104 {PCI_DEVICE(PCI_VENDOR_ID_SILICOM_DENMARK, PCIE_DEVICE_ID_SILICOM_PAC_N5011),},
105 {PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL,
106 PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_D5005),},
107 {PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL,
108 PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_N6000),},
109 {PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL_VF,
110 PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_N6000),},
111 {PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL,
112 PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_N6001),},
113 {PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL_VF,
114 PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_N6001),},
115 {PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL,
116 PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_C6100),},
117 {PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL_VF,
118 PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_C6100),},
121 MODULE_DEVICE_TABLE(pci, cci_pcie_id_tbl);
123 static int cci_init_drvdata(struct pci_dev *pcidev)
125 struct cci_drvdata *drvdata;
127 drvdata = devm_kzalloc(&pcidev->dev, sizeof(*drvdata), GFP_KERNEL);
131 pci_set_drvdata(pcidev, drvdata);
136 static void cci_remove_feature_devs(struct pci_dev *pcidev)
138 struct cci_drvdata *drvdata = pci_get_drvdata(pcidev);
140 /* remove all children feature devices */
141 dfl_fpga_feature_devs_remove(drvdata->cdev);
142 cci_pci_free_irq(pcidev);
145 static int *cci_pci_create_irq_table(struct pci_dev *pcidev, unsigned int nvec)
150 table = kcalloc(nvec, sizeof(int), GFP_KERNEL);
154 for (i = 0; i < nvec; i++)
155 table[i] = pci_irq_vector(pcidev, i);
160 static int find_dfls_by_vsec(struct pci_dev *pcidev, struct dfl_fpga_enum_info *info)
162 u32 bir, offset, dfl_cnt, dfl_res;
163 int dfl_res_off, i, bars, voff;
164 resource_size_t start, len;
166 voff = pci_find_vsec_capability(pcidev, PCI_VENDOR_ID_INTEL,
167 PCI_VSEC_ID_INTEL_DFLS);
169 dev_dbg(&pcidev->dev, "%s no DFL VSEC found\n", __func__);
174 pci_read_config_dword(pcidev, voff + PCI_VNDR_DFLS_CNT, &dfl_cnt);
175 if (dfl_cnt > PCI_STD_NUM_BARS) {
176 dev_err(&pcidev->dev, "%s too many DFLs %d > %d\n",
177 __func__, dfl_cnt, PCI_STD_NUM_BARS);
181 dfl_res_off = voff + PCI_VNDR_DFLS_RES;
182 if (dfl_res_off + (dfl_cnt * sizeof(u32)) > PCI_CFG_SPACE_EXP_SIZE) {
183 dev_err(&pcidev->dev, "%s DFL VSEC too big for PCIe config space\n",
188 for (i = 0, bars = 0; i < dfl_cnt; i++, dfl_res_off += sizeof(u32)) {
189 dfl_res = GENMASK(31, 0);
190 pci_read_config_dword(pcidev, dfl_res_off, &dfl_res);
192 bir = dfl_res & PCI_VNDR_DFLS_RES_BAR_MASK;
193 if (bir >= PCI_STD_NUM_BARS) {
194 dev_err(&pcidev->dev, "%s bad bir number %d\n",
199 if (bars & BIT(bir)) {
200 dev_err(&pcidev->dev, "%s DFL for BAR %d already specified\n",
207 len = pci_resource_len(pcidev, bir);
208 offset = dfl_res & PCI_VNDR_DFLS_RES_OFF_MASK;
210 dev_err(&pcidev->dev, "%s bad offset %u >= %pa\n",
211 __func__, offset, &len);
215 dev_dbg(&pcidev->dev, "%s BAR %d offset 0x%x\n", __func__, bir, offset);
219 start = pci_resource_start(pcidev, bir) + offset;
221 dfl_fpga_enum_info_add_dfl(info, start, len);
227 /* default method of finding dfls starting at offset 0 of bar 0 */
228 static int find_dfls_by_default(struct pci_dev *pcidev,
229 struct dfl_fpga_enum_info *info)
231 int port_num, bar, i, ret = 0;
232 resource_size_t start, len;
237 /* start to find Device Feature List from Bar 0 */
238 base = cci_pci_ioremap_bar0(pcidev);
243 * PF device has FME and Ports/AFUs, and VF device only has one
244 * Port/AFU. Check them and add related "Device Feature List" info
245 * for the next step enumeration.
247 if (dfl_feature_is_fme(base)) {
248 start = pci_resource_start(pcidev, 0);
249 len = pci_resource_len(pcidev, 0);
251 dfl_fpga_enum_info_add_dfl(info, start, len);
254 * find more Device Feature Lists (e.g. Ports) per information
255 * indicated by FME module.
257 v = readq(base + FME_HDR_CAP);
258 port_num = FIELD_GET(FME_CAP_NUM_PORTS, v);
260 WARN_ON(port_num > MAX_DFL_FPGA_PORT_NUM);
262 for (i = 0; i < port_num; i++) {
263 v = readq(base + FME_HDR_PORT_OFST(i));
265 /* skip ports which are not implemented. */
266 if (!(v & FME_PORT_OFST_IMP))
270 * add Port's Device Feature List information for next
273 bar = FIELD_GET(FME_PORT_OFST_BAR_ID, v);
274 offset = FIELD_GET(FME_PORT_OFST_DFH_OFST, v);
275 if (bar == FME_PORT_OFST_BAR_SKIP) {
277 } else if (bar >= PCI_STD_NUM_BARS) {
278 dev_err(&pcidev->dev, "bad BAR %d for port %d\n",
284 start = pci_resource_start(pcidev, bar) + offset;
285 len = pci_resource_len(pcidev, bar) - offset;
287 dfl_fpga_enum_info_add_dfl(info, start, len);
289 } else if (dfl_feature_is_port(base)) {
290 start = pci_resource_start(pcidev, 0);
291 len = pci_resource_len(pcidev, 0);
293 dfl_fpga_enum_info_add_dfl(info, start, len);
298 /* release I/O mappings for next step enumeration */
299 pcim_iounmap_regions(pcidev, BIT(0));
304 /* enumerate feature devices under pci device */
305 static int cci_enumerate_feature_devs(struct pci_dev *pcidev)
307 struct cci_drvdata *drvdata = pci_get_drvdata(pcidev);
308 struct dfl_fpga_enum_info *info;
309 struct dfl_fpga_cdev *cdev;
313 /* allocate enumeration info via pci_dev */
314 info = dfl_fpga_enum_info_alloc(&pcidev->dev);
318 /* add irq info for enumeration if the device support irq */
319 nvec = cci_pci_alloc_irq(pcidev);
321 dev_err(&pcidev->dev, "Fail to alloc irq %d.\n", nvec);
323 goto enum_info_free_exit;
325 irq_table = cci_pci_create_irq_table(pcidev, nvec);
331 ret = dfl_fpga_enum_info_add_irq(info, nvec, irq_table);
337 ret = find_dfls_by_vsec(pcidev, info);
339 ret = find_dfls_by_default(pcidev, info);
344 /* start enumeration with prepared enumeration information */
345 cdev = dfl_fpga_feature_devs_enumerate(info);
347 dev_err(&pcidev->dev, "Enumeration failure\n");
352 drvdata->cdev = cdev;
356 cci_pci_free_irq(pcidev);
358 dfl_fpga_enum_info_free(info);
364 int cci_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *pcidevid)
368 ret = pcim_enable_device(pcidev);
370 dev_err(&pcidev->dev, "Failed to enable device %d.\n", ret);
374 pci_set_master(pcidev);
376 ret = dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(64));
378 ret = dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(32));
380 dev_err(&pcidev->dev, "No suitable DMA support available.\n");
384 ret = cci_init_drvdata(pcidev);
386 dev_err(&pcidev->dev, "Fail to init drvdata %d.\n", ret);
390 ret = cci_enumerate_feature_devs(pcidev);
392 dev_err(&pcidev->dev, "enumeration failure %d.\n", ret);
399 static int cci_pci_sriov_configure(struct pci_dev *pcidev, int num_vfs)
401 struct cci_drvdata *drvdata = pci_get_drvdata(pcidev);
402 struct dfl_fpga_cdev *cdev = drvdata->cdev;
406 * disable SRIOV and then put released ports back to default
409 pci_disable_sriov(pcidev);
411 dfl_fpga_cdev_config_ports_pf(cdev);
417 * before enable SRIOV, put released ports into VF access mode
420 ret = dfl_fpga_cdev_config_ports_vf(cdev, num_vfs);
424 ret = pci_enable_sriov(pcidev, num_vfs);
426 dfl_fpga_cdev_config_ports_pf(cdev);
434 static void cci_pci_remove(struct pci_dev *pcidev)
436 if (dev_is_pf(&pcidev->dev))
437 cci_pci_sriov_configure(pcidev, 0);
439 cci_remove_feature_devs(pcidev);
442 static struct pci_driver cci_pci_driver = {
444 .id_table = cci_pcie_id_tbl,
445 .probe = cci_pci_probe,
446 .remove = cci_pci_remove,
447 .sriov_configure = cci_pci_sriov_configure,
450 module_pci_driver(cci_pci_driver);
452 MODULE_DESCRIPTION("FPGA DFL PCIe Device Driver");
453 MODULE_AUTHOR("Intel Corporation");
454 MODULE_LICENSE("GPL v2");