1 // SPDX-License-Identifier: GPL-2.0
2 /* Marvell Octeon CN10K DPI driver
3 *
4 * Copyright (C) 2024 Marvell.
5 *
6 */
7
8 #include <linux/bitfield.h>
9 #include <linux/compat.h>
10 #include <linux/delay.h>
11 #include <linux/miscdevice.h>
12 #include <linux/module.h>
13 #include <linux/pci.h>
14 #include <linux/irq.h>
15 #include <linux/interrupt.h>
16
17 #include <uapi/misc/mrvl_cn10k_dpi.h>
18
19 /* PCI device IDs */
20 #define PCI_DEVID_MRVL_CN10K_DPI_PF 0xA080
21 #define PCI_SUBDEVID_MRVL_CN10K_DPI_PF 0xB900
22
23 /* PCI BAR Number */
24 #define PCI_DPI_CFG_BAR 0
25
26 /* MSI-X interrupts */
27 #define DPI_MAX_REQQ_INT 0x20
28 #define DPI_MAX_CC_INT 0x40
29
30 /* MBOX MSI-X interrupt vector index */
31 #define DPI_MBOX_PF_VF_INT_IDX 0x75
32
33 #define DPI_MAX_IRQS (DPI_MBOX_PF_VF_INT_IDX + 1)
34
35 #define DPI_MAX_VFS 0x20
36
37 #define DPI_MAX_ENG_FIFO_SZ 0x20
38 #define DPI_MAX_ENG_MOLR 0x400
39
40 #define DPI_DMA_IDS_DMA_NPA_PF_FUNC(x) FIELD_PREP(GENMASK_ULL(31, 16), x)
41 #define DPI_DMA_IDS_INST_STRM(x) FIELD_PREP(GENMASK_ULL(47, 40), x)
42 #define DPI_DMA_IDS_DMA_STRM(x) FIELD_PREP(GENMASK_ULL(39, 32), x)
43 #define DPI_DMA_ENG_EN_MOLR(x) FIELD_PREP(GENMASK_ULL(41, 32), x)
44 #define DPI_EBUS_PORTX_CFG_MPS(x) FIELD_PREP(GENMASK(6, 4), x)
45 #define DPI_DMA_IDS_DMA_SSO_PF_FUNC(x) FIELD_PREP(GENMASK(15, 0), x)
46 #define DPI_DMA_IDS2_INST_AURA(x) FIELD_PREP(GENMASK(19, 0), x)
47 #define DPI_DMA_IBUFF_CSIZE_CSIZE(x) FIELD_PREP(GENMASK(13, 0), x)
48 #define DPI_EBUS_PORTX_CFG_MRRS(x) FIELD_PREP(GENMASK(2, 0), x)
49 #define DPI_ENG_BUF_BLKS(x) FIELD_PREP(GENMASK(5, 0), x)
50 #define DPI_DMA_CONTROL_DMA_ENB GENMASK_ULL(53, 48)
51
52 #define DPI_DMA_CONTROL_O_MODE BIT_ULL(14)
53 #define DPI_DMA_CONTROL_LDWB BIT_ULL(32)
54 #define DPI_DMA_CONTROL_WQECSMODE1 BIT_ULL(37)
55 #define DPI_DMA_CONTROL_ZBWCSEN BIT_ULL(39)
56 #define DPI_DMA_CONTROL_WQECSOFF(ofst) (((u64)ofst) << 40)
57 #define DPI_DMA_CONTROL_WQECSDIS BIT_ULL(47)
58 #define DPI_DMA_CONTROL_PKT_EN BIT_ULL(56)
59 #define DPI_DMA_IBUFF_CSIZE_NPA_FREE BIT(16)
60
61 #define DPI_CTL_EN BIT_ULL(0)
62 #define DPI_DMA_CC_INT BIT_ULL(0)
63 #define DPI_DMA_QRST BIT_ULL(0)
64
65 #define DPI_REQQ_INT_INSTRFLT BIT_ULL(0)
66 #define DPI_REQQ_INT_RDFLT BIT_ULL(1)
67 #define DPI_REQQ_INT_WRFLT BIT_ULL(2)
68 #define DPI_REQQ_INT_CSFLT BIT_ULL(3)
69 #define DPI_REQQ_INT_INST_DBO BIT_ULL(4)
70 #define DPI_REQQ_INT_INST_ADDR_NULL BIT_ULL(5)
71 #define DPI_REQQ_INT_INST_FILL_INVAL BIT_ULL(6)
72 #define DPI_REQQ_INT_INSTR_PSN BIT_ULL(7)
73
74 #define DPI_REQQ_INT \
75 (DPI_REQQ_INT_INSTRFLT | \
76 DPI_REQQ_INT_RDFLT | \
77 DPI_REQQ_INT_WRFLT | \
78 DPI_REQQ_INT_CSFLT | \
79 DPI_REQQ_INT_INST_DBO | \
80 DPI_REQQ_INT_INST_ADDR_NULL | \
81 DPI_REQQ_INT_INST_FILL_INVAL | \
82 DPI_REQQ_INT_INSTR_PSN)
83
84 #define DPI_PF_RAS_EBI_DAT_PSN BIT_ULL(0)
85 #define DPI_PF_RAS_NCB_DAT_PSN BIT_ULL(1)
86 #define DPI_PF_RAS_NCB_CMD_PSN BIT_ULL(2)
87
88 #define DPI_PF_RAS_INT \
89 (DPI_PF_RAS_EBI_DAT_PSN | \
90 DPI_PF_RAS_NCB_DAT_PSN | \
91 DPI_PF_RAS_NCB_CMD_PSN)
92
93 /* Message fields in word_l of DPI mailbox structure */
94 #define DPI_MBOX_VFID(msg) FIELD_GET(GENMASK_ULL(7, 0), msg)
95 #define DPI_MBOX_CMD(msg) FIELD_GET(GENMASK_ULL(11, 8), msg)
96 #define DPI_MBOX_CBUF_SIZE(msg) FIELD_GET(GENMASK_ULL(27, 12), msg)
97 #define DPI_MBOX_CBUF_AURA(msg) FIELD_GET(GENMASK_ULL(47, 28), msg)
98 #define DPI_MBOX_SSO_PFFUNC(msg) FIELD_GET(GENMASK_ULL(63, 48), msg)
99
100 /* Message fields in word_h of DPI mailbox structure */
101 #define DPI_MBOX_NPA_PFFUNC(msg) FIELD_GET(GENMASK_ULL(15, 0), msg)
102 #define DPI_MBOX_WQES_COMPL(msg) FIELD_GET(GENMASK_ULL(16, 16), msg)
103 #define DPI_MBOX_WQES_OFFSET(msg) FIELD_GET(GENMASK_ULL(23, 17), msg)
104
105 #define DPI_DMAX_IBUFF_CSIZE(x) (0x0ULL | ((x) << 11))
106 #define DPI_DMAX_IDS(x) (0x18ULL | ((x) << 11))
107 #define DPI_DMAX_IDS2(x) (0x20ULL | ((x) << 11))
108 #define DPI_DMAX_QRST(x) (0x30ULL | ((x) << 11))
109
110 #define DPI_CTL 0x10010ULL
111 #define DPI_DMA_CONTROL 0x10018ULL
112 #define DPI_PF_RAS 0x10308ULL
113 #define DPI_PF_RAS_ENA_W1C 0x10318ULL
114 #define DPI_MBOX_VF_PF_INT 0x16300ULL
115 #define DPI_MBOX_VF_PF_INT_W1S 0x16308ULL
116 #define DPI_MBOX_VF_PF_INT_ENA_W1C 0x16310ULL
117 #define DPI_MBOX_VF_PF_INT_ENA_W1S 0x16318ULL
118
119 #define DPI_DMA_ENGX_EN(x) (0x10040ULL | ((x) << 3))
120 #define DPI_ENGX_BUF(x) (0x100C0ULL | ((x) << 3))
121 #define DPI_EBUS_PORTX_CFG(x) (0x10100ULL | ((x) << 3))
122 #define DPI_DMA_CCX_INT(x) (0x11000ULL | ((x) << 3))
123 #define DPI_DMA_CCX_INT_ENA_W1C(x) (0x11800ULL | ((x) << 3))
124 #define DPI_REQQX_INT(x) (0x12C00ULL | ((x) << 5))
125 #define DPI_REQQX_INT_ENA_W1C(x) (0x13800ULL | ((x) << 5))
126 #define DPI_MBOX_PF_VF_DATA0(x) (0x16000ULL | ((x) << 4))
127 #define DPI_MBOX_PF_VF_DATA1(x) (0x16008ULL | ((x) << 4))
128
129 #define DPI_WCTL_FIF_THR 0x17008ULL
130
131 #define DPI_EBUS_MAX_PORTS 2
132
133 #define DPI_EBUS_MRRS_MIN 128
134 #define DPI_EBUS_MRRS_MAX 1024
135 #define DPI_EBUS_MPS_MIN 128
136 #define DPI_EBUS_MPS_MAX 1024
137 #define DPI_WCTL_FIFO_THRESHOLD 0x30
138
139 #define DPI_QUEUE_OPEN 0x1
140 #define DPI_QUEUE_CLOSE 0x2
141 #define DPI_REG_DUMP 0x3
142 #define DPI_GET_REG_CFG 0x4
143 #define DPI_QUEUE_OPEN_V2 0x5
144
145 enum dpi_mbox_rsp_type {
146 DPI_MBOX_TYPE_CMD,
147 DPI_MBOX_TYPE_RSP_ACK,
148 DPI_MBOX_TYPE_RSP_NACK,
149 };
150
151 struct dpivf_config {
152 u32 aura;
153 u16 csize;
154 u16 sso_pf_func;
155 u16 npa_pf_func;
156 };
157
158 struct dpipf_vf {
159 struct dpivf_config vf_config;
160 bool setup_done;
161 u8 this_vfid;
162 };
163
164 /* DPI device mailbox */
165 struct dpi_mbox {
166 struct work_struct work;
167 /* lock to serialize mbox requests */
168 struct mutex lock;
169 struct dpipf *pf;
170 u8 __iomem *pf_vf_data_reg;
171 u8 __iomem *vf_pf_data_reg;
172 };
173
174 struct dpipf {
175 struct miscdevice miscdev;
176 void __iomem *reg_base;
177 struct pci_dev *pdev;
178 struct dpipf_vf vf[DPI_MAX_VFS];
179 /* Mailbox to talk to VFs */
180 struct dpi_mbox *mbox[DPI_MAX_VFS];
181 };
182
183 struct dpi_mbox_message {
184 uint64_t word_l;
185 uint64_t word_h;
186 };
187
dpi_reg_write(struct dpipf * dpi,u64 offset,u64 val)188 static inline void dpi_reg_write(struct dpipf *dpi, u64 offset, u64 val)
189 {
190 writeq(val, dpi->reg_base + offset);
191 }
192
dpi_reg_read(struct dpipf * dpi,u64 offset)193 static inline u64 dpi_reg_read(struct dpipf *dpi, u64 offset)
194 {
195 return readq(dpi->reg_base + offset);
196 }
197
dpi_wqe_cs_offset(struct dpipf * dpi,u8 offset)198 static void dpi_wqe_cs_offset(struct dpipf *dpi, u8 offset)
199 {
200 u64 reg;
201
202 reg = dpi_reg_read(dpi, DPI_DMA_CONTROL);
203 reg &= ~DPI_DMA_CONTROL_WQECSDIS;
204 reg |= DPI_DMA_CONTROL_ZBWCSEN | DPI_DMA_CONTROL_WQECSMODE1;
205 reg |= DPI_DMA_CONTROL_WQECSOFF(offset);
206 dpi_reg_write(dpi, DPI_DMA_CONTROL, reg);
207 }
208
dpi_queue_init(struct dpipf * dpi,struct dpipf_vf * dpivf,u8 vf)209 static int dpi_queue_init(struct dpipf *dpi, struct dpipf_vf *dpivf, u8 vf)
210 {
211 u16 sso_pf_func = dpivf->vf_config.sso_pf_func;
212 u16 npa_pf_func = dpivf->vf_config.npa_pf_func;
213 u16 csize = dpivf->vf_config.csize;
214 u32 aura = dpivf->vf_config.aura;
215 unsigned long timeout;
216 u64 reg;
217
218 dpi_reg_write(dpi, DPI_DMAX_QRST(vf), DPI_DMA_QRST);
219
220 /* Wait for a maximum of 3 sec */
221 timeout = jiffies + msecs_to_jiffies(3000);
222 while (!time_after(jiffies, timeout)) {
223 reg = dpi_reg_read(dpi, DPI_DMAX_QRST(vf));
224 if (!(reg & DPI_DMA_QRST))
225 break;
226
227 /* Reset would take time for the request cache to drain */
228 usleep_range(500, 1000);
229 }
230
231 if (reg & DPI_DMA_QRST) {
232 dev_err(&dpi->pdev->dev, "Queue reset failed\n");
233 return -EBUSY;
234 }
235
236 dpi_reg_write(dpi, DPI_DMAX_IDS2(vf), 0);
237 dpi_reg_write(dpi, DPI_DMAX_IDS(vf), 0);
238
239 reg = DPI_DMA_IBUFF_CSIZE_CSIZE(csize) | DPI_DMA_IBUFF_CSIZE_NPA_FREE;
240 dpi_reg_write(dpi, DPI_DMAX_IBUFF_CSIZE(vf), reg);
241
242 reg = dpi_reg_read(dpi, DPI_DMAX_IDS2(vf));
243 reg |= DPI_DMA_IDS2_INST_AURA(aura);
244 dpi_reg_write(dpi, DPI_DMAX_IDS2(vf), reg);
245
246 reg = dpi_reg_read(dpi, DPI_DMAX_IDS(vf));
247 reg |= DPI_DMA_IDS_DMA_NPA_PF_FUNC(npa_pf_func);
248 reg |= DPI_DMA_IDS_DMA_SSO_PF_FUNC(sso_pf_func);
249 reg |= DPI_DMA_IDS_DMA_STRM(vf + 1);
250 reg |= DPI_DMA_IDS_INST_STRM(vf + 1);
251 dpi_reg_write(dpi, DPI_DMAX_IDS(vf), reg);
252
253 return 0;
254 }
255
dpi_queue_fini(struct dpipf * dpi,u8 vf)256 static void dpi_queue_fini(struct dpipf *dpi, u8 vf)
257 {
258 dpi_reg_write(dpi, DPI_DMAX_QRST(vf), DPI_DMA_QRST);
259
260 /* Reset IDS and IDS2 registers */
261 dpi_reg_write(dpi, DPI_DMAX_IDS2(vf), 0);
262 dpi_reg_write(dpi, DPI_DMAX_IDS(vf), 0);
263 }
264
dpi_mbox_intr_handler(int irq,void * data)265 static irqreturn_t dpi_mbox_intr_handler(int irq, void *data)
266 {
267 struct dpipf *dpi = data;
268 u64 reg;
269 u32 vf;
270
271 reg = dpi_reg_read(dpi, DPI_MBOX_VF_PF_INT);
272 if (reg) {
273 for (vf = 0; vf < pci_num_vf(dpi->pdev); vf++) {
274 if (reg & BIT_ULL(vf))
275 schedule_work(&dpi->mbox[vf]->work);
276 }
277 dpi_reg_write(dpi, DPI_MBOX_VF_PF_INT, reg);
278 }
279
280 return IRQ_HANDLED;
281 }
282
queue_config(struct dpipf * dpi,struct dpipf_vf * dpivf,struct dpi_mbox_message * msg)283 static int queue_config(struct dpipf *dpi, struct dpipf_vf *dpivf, struct dpi_mbox_message *msg)
284 {
285 int ret = 0;
286
287 switch (DPI_MBOX_CMD(msg->word_l)) {
288 case DPI_QUEUE_OPEN:
289 case DPI_QUEUE_OPEN_V2:
290 dpivf->vf_config.aura = DPI_MBOX_CBUF_AURA(msg->word_l);
291 dpivf->vf_config.csize = DPI_MBOX_CMD(msg->word_l) == DPI_QUEUE_OPEN ?
292 DPI_MBOX_CBUF_SIZE(msg->word_l) >> 3 :
293 DPI_MBOX_CBUF_SIZE(msg->word_l);
294 dpivf->vf_config.sso_pf_func = DPI_MBOX_SSO_PFFUNC(msg->word_l);
295 dpivf->vf_config.npa_pf_func = DPI_MBOX_NPA_PFFUNC(msg->word_h);
296 ret = dpi_queue_init(dpi, dpivf, DPI_MBOX_VFID(msg->word_l));
297 if (!ret) {
298 if (DPI_MBOX_WQES_COMPL(msg->word_h))
299 dpi_wqe_cs_offset(dpi, DPI_MBOX_WQES_OFFSET(msg->word_h));
300 dpivf->setup_done = true;
301 }
302 break;
303 case DPI_QUEUE_CLOSE:
304 memset(&dpivf->vf_config, 0, sizeof(struct dpivf_config));
305 dpi_queue_fini(dpi, DPI_MBOX_VFID(msg->word_l));
306 dpivf->setup_done = false;
307 break;
308 default:
309 return -EINVAL;
310 }
311
312 return ret;
313 }
314
dpi_pfvf_mbox_work(struct work_struct * work)315 static void dpi_pfvf_mbox_work(struct work_struct *work)
316 {
317 struct dpi_mbox *mbox = container_of(work, struct dpi_mbox, work);
318 struct dpi_mbox_message msg;
319 struct dpipf_vf *dpivf;
320 struct dpipf *dpi;
321 int vfid, ret;
322
323 dpi = mbox->pf;
324 memset(&msg, 0, sizeof(msg));
325
326 mutex_lock(&mbox->lock);
327 msg.word_l = readq(mbox->vf_pf_data_reg);
328 if (msg.word_l == (u64)-1)
329 goto exit;
330
331 vfid = DPI_MBOX_VFID(msg.word_l);
332 if (vfid >= pci_num_vf(dpi->pdev))
333 goto exit;
334
335 dpivf = &dpi->vf[vfid];
336 msg.word_h = readq(mbox->pf_vf_data_reg);
337
338 ret = queue_config(dpi, dpivf, &msg);
339 if (ret < 0)
340 writeq(DPI_MBOX_TYPE_RSP_NACK, mbox->pf_vf_data_reg);
341 else
342 writeq(DPI_MBOX_TYPE_RSP_ACK, mbox->pf_vf_data_reg);
343 exit:
344 mutex_unlock(&mbox->lock);
345 }
346
347 /* Setup registers for a PF mailbox */
dpi_setup_mbox_regs(struct dpipf * dpi,int vf)348 static void dpi_setup_mbox_regs(struct dpipf *dpi, int vf)
349 {
350 struct dpi_mbox *mbox = dpi->mbox[vf];
351
352 mbox->pf_vf_data_reg = dpi->reg_base + DPI_MBOX_PF_VF_DATA0(vf);
353 mbox->vf_pf_data_reg = dpi->reg_base + DPI_MBOX_PF_VF_DATA1(vf);
354 }
355
dpi_pfvf_mbox_setup(struct dpipf * dpi)356 static int dpi_pfvf_mbox_setup(struct dpipf *dpi)
357 {
358 int vf;
359
360 for (vf = 0; vf < DPI_MAX_VFS; vf++) {
361 dpi->mbox[vf] = devm_kzalloc(&dpi->pdev->dev, sizeof(*dpi->mbox[vf]), GFP_KERNEL);
362
363 if (!dpi->mbox[vf])
364 return -ENOMEM;
365
366 mutex_init(&dpi->mbox[vf]->lock);
367 INIT_WORK(&dpi->mbox[vf]->work, dpi_pfvf_mbox_work);
368 dpi->mbox[vf]->pf = dpi;
369 dpi_setup_mbox_regs(dpi, vf);
370 }
371
372 return 0;
373 }
374
dpi_pfvf_mbox_destroy(struct dpipf * dpi)375 static void dpi_pfvf_mbox_destroy(struct dpipf *dpi)
376 {
377 unsigned int vf;
378
379 for (vf = 0; vf < DPI_MAX_VFS; vf++) {
380 if (work_pending(&dpi->mbox[vf]->work))
381 cancel_work_sync(&dpi->mbox[vf]->work);
382
383 dpi->mbox[vf] = NULL;
384 }
385 }
386
dpi_init(struct dpipf * dpi)387 static void dpi_init(struct dpipf *dpi)
388 {
389 unsigned int engine, port;
390 u8 mrrs_val, mps_val;
391 u64 reg;
392
393 for (engine = 0; engine < DPI_MAX_ENGINES; engine++) {
394 if (engine == 4 || engine == 5)
395 reg = DPI_ENG_BUF_BLKS(16);
396 else
397 reg = DPI_ENG_BUF_BLKS(8);
398
399 dpi_reg_write(dpi, DPI_ENGX_BUF(engine), reg);
400 }
401
402 reg = DPI_DMA_CONTROL_ZBWCSEN | DPI_DMA_CONTROL_PKT_EN | DPI_DMA_CONTROL_LDWB |
403 DPI_DMA_CONTROL_O_MODE | DPI_DMA_CONTROL_DMA_ENB;
404
405 dpi_reg_write(dpi, DPI_DMA_CONTROL, reg);
406 dpi_reg_write(dpi, DPI_CTL, DPI_CTL_EN);
407
408 mrrs_val = 2; /* 512B */
409 mps_val = 1; /* 256B */
410
411 for (port = 0; port < DPI_EBUS_MAX_PORTS; port++) {
412 reg = dpi_reg_read(dpi, DPI_EBUS_PORTX_CFG(port));
413 reg &= ~(DPI_EBUS_PORTX_CFG_MRRS(7) | DPI_EBUS_PORTX_CFG_MPS(7));
414 reg |= DPI_EBUS_PORTX_CFG_MPS(mps_val) | DPI_EBUS_PORTX_CFG_MRRS(mrrs_val);
415 dpi_reg_write(dpi, DPI_EBUS_PORTX_CFG(port), reg);
416 }
417
418 dpi_reg_write(dpi, DPI_WCTL_FIF_THR, DPI_WCTL_FIFO_THRESHOLD);
419 }
420
dpi_fini(struct dpipf * dpi)421 static void dpi_fini(struct dpipf *dpi)
422 {
423 unsigned int engine;
424
425 for (engine = 0; engine < DPI_MAX_ENGINES; engine++)
426 dpi_reg_write(dpi, DPI_ENGX_BUF(engine), 0);
427
428 dpi_reg_write(dpi, DPI_DMA_CONTROL, 0);
429 dpi_reg_write(dpi, DPI_CTL, 0);
430 }
431
dpi_free_irq_vectors(void * pdev)432 static void dpi_free_irq_vectors(void *pdev)
433 {
434 pci_free_irq_vectors((struct pci_dev *)pdev);
435 }
436
dpi_irq_init(struct dpipf * dpi)437 static int dpi_irq_init(struct dpipf *dpi)
438 {
439 struct pci_dev *pdev = dpi->pdev;
440 struct device *dev = &pdev->dev;
441 int i, ret;
442
443 /* Clear all RAS interrupts */
444 dpi_reg_write(dpi, DPI_PF_RAS, DPI_PF_RAS_INT);
445
446 /* Clear all RAS interrupt enable bits */
447 dpi_reg_write(dpi, DPI_PF_RAS_ENA_W1C, DPI_PF_RAS_INT);
448
449 for (i = 0; i < DPI_MAX_REQQ_INT; i++) {
450 dpi_reg_write(dpi, DPI_REQQX_INT(i), DPI_REQQ_INT);
451 dpi_reg_write(dpi, DPI_REQQX_INT_ENA_W1C(i), DPI_REQQ_INT);
452 }
453
454 for (i = 0; i < DPI_MAX_CC_INT; i++) {
455 dpi_reg_write(dpi, DPI_DMA_CCX_INT(i), DPI_DMA_CC_INT);
456 dpi_reg_write(dpi, DPI_DMA_CCX_INT_ENA_W1C(i), DPI_DMA_CC_INT);
457 }
458
459 ret = pci_alloc_irq_vectors(pdev, DPI_MAX_IRQS, DPI_MAX_IRQS, PCI_IRQ_MSIX);
460 if (ret != DPI_MAX_IRQS) {
461 dev_err(dev, "DPI: Failed to alloc %d msix irqs\n", DPI_MAX_IRQS);
462 return ret;
463 }
464
465 ret = devm_add_action_or_reset(dev, dpi_free_irq_vectors, pdev);
466 if (ret) {
467 dev_err(dev, "DPI: Failed to add irq free action\n");
468 return ret;
469 }
470
471 ret = devm_request_irq(dev, pci_irq_vector(pdev, DPI_MBOX_PF_VF_INT_IDX),
472 dpi_mbox_intr_handler, 0, "dpi-mbox", dpi);
473 if (ret) {
474 dev_err(dev, "DPI: request_irq failed for mbox; err=%d\n", ret);
475 return ret;
476 }
477
478 dpi_reg_write(dpi, DPI_MBOX_VF_PF_INT_ENA_W1S, GENMASK_ULL(31, 0));
479
480 return 0;
481 }
482
dpi_mps_mrrs_config(struct dpipf * dpi,void __user * arg)483 static int dpi_mps_mrrs_config(struct dpipf *dpi, void __user *arg)
484 {
485 struct dpi_mps_mrrs_cfg cfg;
486 u8 mrrs_val, mps_val;
487 u64 reg;
488
489 if (copy_from_user(&cfg, arg, sizeof(struct dpi_mps_mrrs_cfg)))
490 return -EFAULT;
491
492 if (cfg.max_read_req_sz < DPI_EBUS_MRRS_MIN || cfg.max_read_req_sz > DPI_EBUS_MRRS_MAX ||
493 !is_power_of_2(cfg.max_read_req_sz))
494 return -EINVAL;
495
496 if (cfg.max_payload_sz < DPI_EBUS_MPS_MIN || cfg.max_payload_sz > DPI_EBUS_MPS_MAX ||
497 !is_power_of_2(cfg.max_payload_sz))
498 return -EINVAL;
499
500 if (cfg.port >= DPI_EBUS_MAX_PORTS)
501 return -EINVAL;
502
503 /* Make sure reserved fields are set to 0 */
504 if (cfg.reserved)
505 return -EINVAL;
506
507 mrrs_val = fls(cfg.max_read_req_sz >> 8);
508 mps_val = fls(cfg.max_payload_sz >> 8);
509
510 reg = dpi_reg_read(dpi, DPI_EBUS_PORTX_CFG(cfg.port));
511 reg &= ~(DPI_EBUS_PORTX_CFG_MRRS(0x7) | DPI_EBUS_PORTX_CFG_MPS(0x7));
512 reg |= DPI_EBUS_PORTX_CFG_MPS(mps_val) | DPI_EBUS_PORTX_CFG_MRRS(mrrs_val);
513 dpi_reg_write(dpi, DPI_EBUS_PORTX_CFG(cfg.port), reg);
514
515 return 0;
516 }
517
dpi_engine_config(struct dpipf * dpi,void __user * arg)518 static int dpi_engine_config(struct dpipf *dpi, void __user *arg)
519 {
520 struct dpi_engine_cfg cfg;
521 unsigned int engine;
522 u8 *eng_buf;
523 u64 reg;
524
525 if (copy_from_user(&cfg, arg, sizeof(struct dpi_engine_cfg)))
526 return -EFAULT;
527
528 /* Make sure reserved fields are set to 0 */
529 if (cfg.reserved)
530 return -EINVAL;
531
532 eng_buf = (u8 *)&cfg.fifo_mask;
533
534 for (engine = 0; engine < DPI_MAX_ENGINES; engine++) {
535 if (eng_buf[engine] > DPI_MAX_ENG_FIFO_SZ)
536 return -EINVAL;
537 dpi_reg_write(dpi, DPI_ENGX_BUF(engine), eng_buf[engine]);
538
539 if (cfg.update_molr) {
540 if (cfg.molr[engine] > DPI_MAX_ENG_MOLR)
541 return -EINVAL;
542 reg = DPI_DMA_ENG_EN_MOLR(cfg.molr[engine]);
543 dpi_reg_write(dpi, DPI_DMA_ENGX_EN(engine), reg);
544 } else {
545 /* Make sure unused fields are set to 0 */
546 if (cfg.molr[engine])
547 return -EINVAL;
548 }
549 }
550
551 return 0;
552 }
553
dpi_dev_ioctl(struct file * fptr,unsigned int cmd,unsigned long data)554 static long dpi_dev_ioctl(struct file *fptr, unsigned int cmd, unsigned long data)
555 {
556 void __user *arg = (void __user *)data;
557 struct dpipf *dpi;
558 int ret;
559
560 dpi = container_of(fptr->private_data, struct dpipf, miscdev);
561
562 switch (cmd) {
563 case DPI_MPS_MRRS_CFG:
564 ret = dpi_mps_mrrs_config(dpi, arg);
565 break;
566 case DPI_ENGINE_CFG:
567 ret = dpi_engine_config(dpi, arg);
568 break;
569 default:
570 ret = -ENOTTY;
571 break;
572 }
573
574 return ret;
575 }
576
577 static const struct file_operations dpi_device_fops = {
578 .owner = THIS_MODULE,
579 .unlocked_ioctl = dpi_dev_ioctl,
580 .compat_ioctl = compat_ptr_ioctl,
581 };
582
dpi_probe(struct pci_dev * pdev,const struct pci_device_id * id)583 static int dpi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
584 {
585 struct device *dev = &pdev->dev;
586 struct dpipf *dpi;
587 int ret;
588
589 dpi = devm_kzalloc(dev, sizeof(*dpi), GFP_KERNEL);
590 if (!dpi)
591 return -ENOMEM;
592
593 dpi->pdev = pdev;
594
595 ret = pcim_enable_device(pdev);
596 if (ret) {
597 dev_err(dev, "DPI: Failed to enable PCI device\n");
598 return ret;
599 }
600
601 ret = pcim_iomap_regions(pdev, BIT(0) | BIT(4), KBUILD_MODNAME);
602 if (ret) {
603 dev_err(dev, "DPI: Failed to request MMIO region\n");
604 return ret;
605 }
606
607 dpi->reg_base = pcim_iomap_table(pdev)[PCI_DPI_CFG_BAR];
608
609 /* Initialize global PF registers */
610 dpi_init(dpi);
611
612 /* Setup PF-VF mailbox */
613 ret = dpi_pfvf_mbox_setup(dpi);
614 if (ret) {
615 dev_err(dev, "DPI: Failed to setup pf-vf mbox\n");
616 goto err_dpi_fini;
617 }
618
619 /* Register interrupts */
620 ret = dpi_irq_init(dpi);
621 if (ret) {
622 dev_err(dev, "DPI: Failed to initialize irq vectors\n");
623 goto err_dpi_mbox_free;
624 }
625
626 pci_set_drvdata(pdev, dpi);
627 dpi->miscdev.minor = MISC_DYNAMIC_MINOR;
628 dpi->miscdev.name = KBUILD_MODNAME;
629 dpi->miscdev.fops = &dpi_device_fops;
630 dpi->miscdev.parent = dev;
631
632 ret = misc_register(&dpi->miscdev);
633 if (ret) {
634 dev_err(dev, "DPI: Failed to register misc device\n");
635 goto err_dpi_mbox_free;
636 }
637
638 return 0;
639
640 err_dpi_mbox_free:
641 dpi_pfvf_mbox_destroy(dpi);
642 err_dpi_fini:
643 dpi_fini(dpi);
644 return ret;
645 }
646
dpi_remove(struct pci_dev * pdev)647 static void dpi_remove(struct pci_dev *pdev)
648 {
649 struct dpipf *dpi = pci_get_drvdata(pdev);
650
651 misc_deregister(&dpi->miscdev);
652 pci_sriov_configure_simple(pdev, 0);
653 dpi_pfvf_mbox_destroy(dpi);
654 dpi_fini(dpi);
655 pci_set_drvdata(pdev, NULL);
656 }
657
658 static const struct pci_device_id dpi_id_table[] = {
659 { PCI_DEVICE_SUB(PCI_VENDOR_ID_CAVIUM, PCI_DEVID_MRVL_CN10K_DPI_PF,
660 PCI_VENDOR_ID_CAVIUM, PCI_SUBDEVID_MRVL_CN10K_DPI_PF) },
661 { 0, } /* end of table */
662 };
663
664 static struct pci_driver dpi_driver = {
665 .name = KBUILD_MODNAME,
666 .id_table = dpi_id_table,
667 .probe = dpi_probe,
668 .remove = dpi_remove,
669 .sriov_configure = pci_sriov_configure_simple,
670 };
671
672 module_pci_driver(dpi_driver);
673 MODULE_DEVICE_TABLE(pci, dpi_id_table);
674 MODULE_AUTHOR("Marvell.");
675 MODULE_DESCRIPTION("Marvell Octeon CN10K DPI Driver");
676 MODULE_LICENSE("GPL");
677