1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Driver for FPGA Device Feature List (DFL) PCIe device
4 *
5 * Copyright (C) 2017-2018 Intel Corporation, Inc.
6 *
7 * Authors:
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>
15 */
16
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>
24
25#include "dfl.h"
26
27#define DRV_VERSION "0.8"
28#define DRV_NAME "dfl-pci"
29
30#define PCI_VSEC_ID_INTEL_DFLS 0x43
31
32#define PCI_VNDR_DFLS_CNT 0x8
33#define PCI_VNDR_DFLS_RES 0xc
34
35#define PCI_VNDR_DFLS_RES_BAR_MASK GENMASK(2, 0)
36#define PCI_VNDR_DFLS_RES_OFF_MASK GENMASK(31, 3)
37
38struct cci_drvdata {
39 struct dfl_fpga_cdev *cdev; /* container device */
40};
41
42static int cci_pci_alloc_irq(struct pci_dev *pcidev)
43{
44 int ret, nvec = pci_msix_vec_count(dev: pcidev);
45
46 if (nvec <= 0) {
47 dev_dbg(&pcidev->dev, "fpga interrupt not supported\n");
48 return 0;
49 }
50
51 ret = pci_alloc_irq_vectors(dev: pcidev, min_vecs: nvec, max_vecs: nvec, PCI_IRQ_MSIX);
52 if (ret < 0)
53 return ret;
54
55 return nvec;
56}
57
58static void cci_pci_free_irq(struct pci_dev *pcidev)
59{
60 pci_free_irq_vectors(dev: pcidev);
61}
62
63/* PCI Device ID */
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
68#define PCIE_DEVICE_ID_INTEL_PAC_D5005 0x0B2B
69#define PCIE_DEVICE_ID_SILICOM_PAC_N5010 0x1000
70#define PCIE_DEVICE_ID_SILICOM_PAC_N5011 0x1001
71#define PCIE_DEVICE_ID_INTEL_DFL 0xbcce
72/* PCI Subdevice ID for PCIE_DEVICE_ID_INTEL_DFL */
73#define PCIE_SUBDEVICE_ID_INTEL_D5005 0x138d
74#define PCIE_SUBDEVICE_ID_INTEL_N6000 0x1770
75#define PCIE_SUBDEVICE_ID_INTEL_N6001 0x1771
76#define PCIE_SUBDEVICE_ID_INTEL_C6100 0x17d4
77
78/* VF Device */
79#define PCIE_DEVICE_ID_VF_INT_5_X 0xBCBF
80#define PCIE_DEVICE_ID_VF_INT_6_X 0xBCC1
81#define PCIE_DEVICE_ID_VF_DSC_1_X 0x09C5
82#define PCIE_DEVICE_ID_INTEL_PAC_D5005_VF 0x0B2C
83#define PCIE_DEVICE_ID_INTEL_DFL_VF 0xbccf
84
85static struct pci_device_id cci_pcie_id_tbl[] = {
86 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_PF_INT_5_X),},
87 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_VF_INT_5_X),},
88 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_PF_INT_6_X),},
89 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_VF_INT_6_X),},
90 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_PF_DSC_1_X),},
91 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_VF_DSC_1_X),},
92 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_PAC_N3000),},
93 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_PAC_D5005),},
94 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_PAC_D5005_VF),},
95 {PCI_DEVICE(PCI_VENDOR_ID_SILICOM_DENMARK, PCIE_DEVICE_ID_SILICOM_PAC_N5010),},
96 {PCI_DEVICE(PCI_VENDOR_ID_SILICOM_DENMARK, PCIE_DEVICE_ID_SILICOM_PAC_N5011),},
97 {PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL,
98 PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_D5005),},
99 {PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL,
100 PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_N6000),},
101 {PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL_VF,
102 PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_N6000),},
103 {PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL,
104 PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_N6001),},
105 {PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL_VF,
106 PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_N6001),},
107 {PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL,
108 PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_C6100),},
109 {PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_INTEL_DFL_VF,
110 PCI_VENDOR_ID_INTEL, PCIE_SUBDEVICE_ID_INTEL_C6100),},
111 {0,}
112};
113MODULE_DEVICE_TABLE(pci, cci_pcie_id_tbl);
114
115static int cci_init_drvdata(struct pci_dev *pcidev)
116{
117 struct cci_drvdata *drvdata;
118
119 drvdata = devm_kzalloc(dev: &pcidev->dev, size: sizeof(*drvdata), GFP_KERNEL);
120 if (!drvdata)
121 return -ENOMEM;
122
123 pci_set_drvdata(pdev: pcidev, data: drvdata);
124
125 return 0;
126}
127
128static void cci_remove_feature_devs(struct pci_dev *pcidev)
129{
130 struct cci_drvdata *drvdata = pci_get_drvdata(pdev: pcidev);
131
132 /* remove all children feature devices */
133 dfl_fpga_feature_devs_remove(cdev: drvdata->cdev);
134 cci_pci_free_irq(pcidev);
135}
136
137static int *cci_pci_create_irq_table(struct pci_dev *pcidev, unsigned int nvec)
138{
139 unsigned int i;
140 int *table;
141
142 table = kcalloc(nvec, sizeof(int), GFP_KERNEL);
143 if (!table)
144 return table;
145
146 for (i = 0; i < nvec; i++)
147 table[i] = pci_irq_vector(dev: pcidev, nr: i);
148
149 return table;
150}
151
152static int find_dfls_by_vsec(struct pci_dev *pcidev, struct dfl_fpga_enum_info *info)
153{
154 u32 bir, offset, dfl_cnt, dfl_res;
155 int dfl_res_off, i, bars, voff;
156 resource_size_t start, len;
157
158 voff = pci_find_vsec_capability(dev: pcidev, PCI_VENDOR_ID_INTEL,
159 PCI_VSEC_ID_INTEL_DFLS);
160 if (!voff) {
161 dev_dbg(&pcidev->dev, "%s no DFL VSEC found\n", __func__);
162 return -ENODEV;
163 }
164
165 dfl_cnt = 0;
166 pci_read_config_dword(dev: pcidev, where: voff + PCI_VNDR_DFLS_CNT, val: &dfl_cnt);
167 if (dfl_cnt > PCI_STD_NUM_BARS) {
168 dev_err(&pcidev->dev, "%s too many DFLs %d > %d\n",
169 __func__, dfl_cnt, PCI_STD_NUM_BARS);
170 return -EINVAL;
171 }
172
173 dfl_res_off = voff + PCI_VNDR_DFLS_RES;
174 if (dfl_res_off + (dfl_cnt * sizeof(u32)) > PCI_CFG_SPACE_EXP_SIZE) {
175 dev_err(&pcidev->dev, "%s DFL VSEC too big for PCIe config space\n",
176 __func__);
177 return -EINVAL;
178 }
179
180 for (i = 0, bars = 0; i < dfl_cnt; i++, dfl_res_off += sizeof(u32)) {
181 dfl_res = GENMASK(31, 0);
182 pci_read_config_dword(dev: pcidev, where: dfl_res_off, val: &dfl_res);
183
184 bir = dfl_res & PCI_VNDR_DFLS_RES_BAR_MASK;
185 if (bir >= PCI_STD_NUM_BARS) {
186 dev_err(&pcidev->dev, "%s bad bir number %d\n",
187 __func__, bir);
188 return -EINVAL;
189 }
190
191 if (bars & BIT(bir)) {
192 dev_err(&pcidev->dev, "%s DFL for BAR %d already specified\n",
193 __func__, bir);
194 return -EINVAL;
195 }
196
197 bars |= BIT(bir);
198
199 len = pci_resource_len(pcidev, bir);
200 offset = dfl_res & PCI_VNDR_DFLS_RES_OFF_MASK;
201 if (offset >= len) {
202 dev_err(&pcidev->dev, "%s bad offset %u >= %pa\n",
203 __func__, offset, &len);
204 return -EINVAL;
205 }
206
207 dev_dbg(&pcidev->dev, "%s BAR %d offset 0x%x\n", __func__, bir, offset);
208
209 len -= offset;
210
211 start = pci_resource_start(pcidev, bir) + offset;
212
213 dfl_fpga_enum_info_add_dfl(info, start, len);
214 }
215
216 return 0;
217}
218
219/* default method of finding dfls starting at offset 0 of bar 0 */
220static int find_dfls_by_default(struct pci_dev *pcidev,
221 struct dfl_fpga_enum_info *info)
222{
223 int port_num, bar, i, ret = 0;
224 resource_size_t start, len;
225 void __iomem *base;
226 u32 offset;
227 u64 v;
228
229 /* start to find Device Feature List from Bar 0 */
230 base = pcim_iomap_region(pdev: pcidev, bar: 0, DRV_NAME);
231 if (IS_ERR(ptr: base))
232 return PTR_ERR(ptr: base);
233
234 /*
235 * PF device has FME and Ports/AFUs, and VF device only has one
236 * Port/AFU. Check them and add related "Device Feature List" info
237 * for the next step enumeration.
238 */
239 if (dfl_feature_is_fme(base)) {
240 start = pci_resource_start(pcidev, 0);
241 len = pci_resource_len(pcidev, 0);
242
243 dfl_fpga_enum_info_add_dfl(info, start, len);
244
245 /*
246 * find more Device Feature Lists (e.g. Ports) per information
247 * indicated by FME module.
248 */
249 v = readq(addr: base + FME_HDR_CAP);
250 port_num = FIELD_GET(FME_CAP_NUM_PORTS, v);
251
252 WARN_ON(port_num > MAX_DFL_FPGA_PORT_NUM);
253
254 for (i = 0; i < port_num; i++) {
255 v = readq(addr: base + FME_HDR_PORT_OFST(i));
256
257 /* skip ports which are not implemented. */
258 if (!(v & FME_PORT_OFST_IMP))
259 continue;
260
261 /*
262 * add Port's Device Feature List information for next
263 * step enumeration.
264 */
265 bar = FIELD_GET(FME_PORT_OFST_BAR_ID, v);
266 offset = FIELD_GET(FME_PORT_OFST_DFH_OFST, v);
267 if (bar == FME_PORT_OFST_BAR_SKIP) {
268 continue;
269 } else if (bar >= PCI_STD_NUM_BARS) {
270 dev_err(&pcidev->dev, "bad BAR %d for port %d\n",
271 bar, i);
272 ret = -EINVAL;
273 break;
274 }
275
276 start = pci_resource_start(pcidev, bar) + offset;
277 len = pci_resource_len(pcidev, bar) - offset;
278
279 dfl_fpga_enum_info_add_dfl(info, start, len);
280 }
281 } else if (dfl_feature_is_port(base)) {
282 start = pci_resource_start(pcidev, 0);
283 len = pci_resource_len(pcidev, 0);
284
285 dfl_fpga_enum_info_add_dfl(info, start, len);
286 } else {
287 ret = -ENODEV;
288 }
289
290 /* release I/O mappings for next step enumeration */
291 pcim_iounmap_region(pdev: pcidev, bar: 0);
292
293 return ret;
294}
295
296/* enumerate feature devices under pci device */
297static int cci_enumerate_feature_devs(struct pci_dev *pcidev)
298{
299 struct cci_drvdata *drvdata = pci_get_drvdata(pdev: pcidev);
300 struct dfl_fpga_enum_info *info;
301 struct dfl_fpga_cdev *cdev;
302 int nvec, ret = 0;
303 int *irq_table;
304
305 /* allocate enumeration info via pci_dev */
306 info = dfl_fpga_enum_info_alloc(dev: &pcidev->dev);
307 if (!info)
308 return -ENOMEM;
309
310 /* add irq info for enumeration if the device support irq */
311 nvec = cci_pci_alloc_irq(pcidev);
312 if (nvec < 0) {
313 dev_err(&pcidev->dev, "Fail to alloc irq %d.\n", nvec);
314 ret = nvec;
315 goto enum_info_free_exit;
316 } else if (nvec) {
317 irq_table = cci_pci_create_irq_table(pcidev, nvec);
318 if (!irq_table) {
319 ret = -ENOMEM;
320 goto irq_free_exit;
321 }
322
323 ret = dfl_fpga_enum_info_add_irq(info, nr_irqs: nvec, irq_table);
324 kfree(objp: irq_table);
325 if (ret)
326 goto irq_free_exit;
327 }
328
329 ret = find_dfls_by_vsec(pcidev, info);
330 if (ret == -ENODEV)
331 ret = find_dfls_by_default(pcidev, info);
332
333 if (ret)
334 goto irq_free_exit;
335
336 /* start enumeration with prepared enumeration information */
337 cdev = dfl_fpga_feature_devs_enumerate(info);
338 if (IS_ERR(ptr: cdev)) {
339 dev_err(&pcidev->dev, "Enumeration failure\n");
340 ret = PTR_ERR(ptr: cdev);
341 goto irq_free_exit;
342 }
343
344 drvdata->cdev = cdev;
345
346irq_free_exit:
347 if (ret)
348 cci_pci_free_irq(pcidev);
349enum_info_free_exit:
350 dfl_fpga_enum_info_free(info);
351
352 return ret;
353}
354
355static
356int cci_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *pcidevid)
357{
358 int ret;
359
360 ret = pcim_enable_device(pdev: pcidev);
361 if (ret < 0) {
362 dev_err(&pcidev->dev, "Failed to enable device %d.\n", ret);
363 return ret;
364 }
365
366 pci_set_master(dev: pcidev);
367
368 ret = dma_set_mask_and_coherent(dev: &pcidev->dev, DMA_BIT_MASK(64));
369 if (ret)
370 ret = dma_set_mask_and_coherent(dev: &pcidev->dev, DMA_BIT_MASK(32));
371 if (ret) {
372 dev_err(&pcidev->dev, "No suitable DMA support available.\n");
373 return ret;
374 }
375
376 ret = cci_init_drvdata(pcidev);
377 if (ret) {
378 dev_err(&pcidev->dev, "Fail to init drvdata %d.\n", ret);
379 return ret;
380 }
381
382 ret = cci_enumerate_feature_devs(pcidev);
383 if (ret) {
384 dev_err(&pcidev->dev, "enumeration failure %d.\n", ret);
385 return ret;
386 }
387
388 return 0;
389}
390
391static int cci_pci_sriov_configure(struct pci_dev *pcidev, int num_vfs)
392{
393 struct cci_drvdata *drvdata = pci_get_drvdata(pdev: pcidev);
394 struct dfl_fpga_cdev *cdev = drvdata->cdev;
395
396 if (!num_vfs) {
397 /*
398 * disable SRIOV and then put released ports back to default
399 * PF access mode.
400 */
401 pci_disable_sriov(dev: pcidev);
402
403 dfl_fpga_cdev_config_ports_pf(cdev);
404
405 } else {
406 int ret;
407
408 /*
409 * before enable SRIOV, put released ports into VF access mode
410 * first of all.
411 */
412 ret = dfl_fpga_cdev_config_ports_vf(cdev, num_vf: num_vfs);
413 if (ret)
414 return ret;
415
416 ret = pci_enable_sriov(dev: pcidev, nr_virtfn: num_vfs);
417 if (ret) {
418 dfl_fpga_cdev_config_ports_pf(cdev);
419 return ret;
420 }
421 }
422
423 return num_vfs;
424}
425
426static void cci_pci_remove(struct pci_dev *pcidev)
427{
428 if (dev_is_pf(&pcidev->dev))
429 cci_pci_sriov_configure(pcidev, num_vfs: 0);
430
431 cci_remove_feature_devs(pcidev);
432}
433
434static struct pci_driver cci_pci_driver = {
435 .name = DRV_NAME,
436 .id_table = cci_pcie_id_tbl,
437 .probe = cci_pci_probe,
438 .remove = cci_pci_remove,
439 .sriov_configure = cci_pci_sriov_configure,
440};
441
442module_pci_driver(cci_pci_driver);
443
444MODULE_DESCRIPTION("FPGA DFL PCIe Device Driver");
445MODULE_AUTHOR("Intel Corporation");
446MODULE_LICENSE("GPL v2");
447

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source code of linux/drivers/fpga/dfl-pci.c