1// SPDX-License-Identifier: GPL-2.0
2/* Copyright(c) 2023 Advanced Micro Devices, Inc */
3
4#include <linux/errno.h>
5#include <linux/pci.h>
6#include <linux/utsname.h>
7
8#include "core.h"
9
10int pdsc_err_to_errno(enum pds_core_status_code code)
11{
12 switch (code) {
13 case PDS_RC_SUCCESS:
14 return 0;
15 case PDS_RC_EVERSION:
16 case PDS_RC_EQTYPE:
17 case PDS_RC_EQID:
18 case PDS_RC_EINVAL:
19 case PDS_RC_ENOSUPP:
20 return -EINVAL;
21 case PDS_RC_EPERM:
22 return -EPERM;
23 case PDS_RC_ENOENT:
24 return -ENOENT;
25 case PDS_RC_EAGAIN:
26 return -EAGAIN;
27 case PDS_RC_ENOMEM:
28 return -ENOMEM;
29 case PDS_RC_EFAULT:
30 return -EFAULT;
31 case PDS_RC_EBUSY:
32 return -EBUSY;
33 case PDS_RC_EEXIST:
34 return -EEXIST;
35 case PDS_RC_EVFID:
36 return -ENODEV;
37 case PDS_RC_ECLIENT:
38 return -ECHILD;
39 case PDS_RC_ENOSPC:
40 return -ENOSPC;
41 case PDS_RC_ERANGE:
42 return -ERANGE;
43 case PDS_RC_BAD_ADDR:
44 return -EFAULT;
45 case PDS_RC_BAD_PCI:
46 return -ENXIO;
47 case PDS_RC_EOPCODE:
48 case PDS_RC_EINTR:
49 case PDS_RC_DEV_CMD:
50 case PDS_RC_ERROR:
51 case PDS_RC_ERDMA:
52 case PDS_RC_EIO:
53 default:
54 return -EIO;
55 }
56}
57
58bool pdsc_is_fw_running(struct pdsc *pdsc)
59{
60 if (!pdsc->info_regs)
61 return false;
62
63 pdsc->fw_status = ioread8(&pdsc->info_regs->fw_status);
64 pdsc->last_fw_time = jiffies;
65 pdsc->last_hb = ioread32(&pdsc->info_regs->fw_heartbeat);
66
67 /* Firmware is useful only if the running bit is set and
68 * fw_status != 0xff (bad PCI read)
69 */
70 return (pdsc->fw_status != PDS_RC_BAD_PCI) &&
71 (pdsc->fw_status & PDS_CORE_FW_STS_F_RUNNING);
72}
73
74bool pdsc_is_fw_good(struct pdsc *pdsc)
75{
76 bool fw_running = pdsc_is_fw_running(pdsc);
77 u8 gen;
78
79 /* Make sure to update the cached fw_status by calling
80 * pdsc_is_fw_running() before getting the generation
81 */
82 gen = pdsc->fw_status & PDS_CORE_FW_STS_F_GENERATION;
83
84 return fw_running && gen == pdsc->fw_generation;
85}
86
87static u8 pdsc_devcmd_status(struct pdsc *pdsc)
88{
89 return ioread8(&pdsc->cmd_regs->comp.status);
90}
91
92static bool pdsc_devcmd_done(struct pdsc *pdsc)
93{
94 return ioread32(&pdsc->cmd_regs->done) & PDS_CORE_DEV_CMD_DONE;
95}
96
97static void pdsc_devcmd_dbell(struct pdsc *pdsc)
98{
99 iowrite32(0, &pdsc->cmd_regs->done);
100 iowrite32(1, &pdsc->cmd_regs->doorbell);
101}
102
103static void pdsc_devcmd_clean(struct pdsc *pdsc)
104{
105 iowrite32(0, &pdsc->cmd_regs->doorbell);
106 memset_io(&pdsc->cmd_regs->cmd, 0, sizeof(pdsc->cmd_regs->cmd));
107}
108
109static const char *pdsc_devcmd_str(int opcode)
110{
111 switch (opcode) {
112 case PDS_CORE_CMD_NOP:
113 return "PDS_CORE_CMD_NOP";
114 case PDS_CORE_CMD_IDENTIFY:
115 return "PDS_CORE_CMD_IDENTIFY";
116 case PDS_CORE_CMD_RESET:
117 return "PDS_CORE_CMD_RESET";
118 case PDS_CORE_CMD_INIT:
119 return "PDS_CORE_CMD_INIT";
120 case PDS_CORE_CMD_FW_DOWNLOAD:
121 return "PDS_CORE_CMD_FW_DOWNLOAD";
122 case PDS_CORE_CMD_FW_CONTROL:
123 return "PDS_CORE_CMD_FW_CONTROL";
124 default:
125 return "PDS_CORE_CMD_UNKNOWN";
126 }
127}
128
129static int pdsc_devcmd_wait(struct pdsc *pdsc, u8 opcode, int max_seconds)
130{
131 struct device *dev = pdsc->dev;
132 unsigned long start_time;
133 unsigned long max_wait;
134 unsigned long duration;
135 int timeout = 0;
136 bool running;
137 int done = 0;
138 int err = 0;
139 int status;
140
141 start_time = jiffies;
142 max_wait = start_time + (max_seconds * HZ);
143
144 while (!done && !timeout) {
145 running = pdsc_is_fw_running(pdsc);
146 if (!running)
147 break;
148
149 done = pdsc_devcmd_done(pdsc);
150 if (done)
151 break;
152
153 timeout = time_after(jiffies, max_wait);
154 if (timeout)
155 break;
156
157 usleep_range(min: 100, max: 200);
158 }
159 duration = jiffies - start_time;
160
161 if (done && duration > HZ)
162 dev_dbg(dev, "DEVCMD %d %s after %ld secs\n",
163 opcode, pdsc_devcmd_str(opcode), duration / HZ);
164
165 if ((!done || timeout) && running) {
166 dev_err(dev, "DEVCMD %d %s timeout, done %d timeout %d max_seconds=%d\n",
167 opcode, pdsc_devcmd_str(opcode), done, timeout,
168 max_seconds);
169 err = -ETIMEDOUT;
170 pdsc_devcmd_clean(pdsc);
171 }
172
173 status = pdsc_devcmd_status(pdsc);
174 err = pdsc_err_to_errno(code: status);
175 if (err && err != -EAGAIN)
176 dev_err(dev, "DEVCMD %d %s failed, status=%d err %d %pe\n",
177 opcode, pdsc_devcmd_str(opcode), status, err,
178 ERR_PTR(err));
179
180 return err;
181}
182
183int pdsc_devcmd_locked(struct pdsc *pdsc, union pds_core_dev_cmd *cmd,
184 union pds_core_dev_comp *comp, int max_seconds)
185{
186 int err;
187
188 if (!pdsc->cmd_regs)
189 return -ENXIO;
190
191 memcpy_toio(&pdsc->cmd_regs->cmd, cmd, sizeof(*cmd));
192 pdsc_devcmd_dbell(pdsc);
193 err = pdsc_devcmd_wait(pdsc, opcode: cmd->opcode, max_seconds);
194
195 if ((err == -ENXIO || err == -ETIMEDOUT) && pdsc->wq)
196 queue_work(wq: pdsc->wq, work: &pdsc->health_work);
197 else
198 memcpy_fromio(comp, &pdsc->cmd_regs->comp, sizeof(*comp));
199
200 return err;
201}
202
203int pdsc_devcmd(struct pdsc *pdsc, union pds_core_dev_cmd *cmd,
204 union pds_core_dev_comp *comp, int max_seconds)
205{
206 int err;
207
208 mutex_lock(&pdsc->devcmd_lock);
209 err = pdsc_devcmd_locked(pdsc, cmd, comp, max_seconds);
210 mutex_unlock(lock: &pdsc->devcmd_lock);
211
212 return err;
213}
214
215int pdsc_devcmd_init(struct pdsc *pdsc)
216{
217 union pds_core_dev_comp comp = {};
218 union pds_core_dev_cmd cmd = {
219 .opcode = PDS_CORE_CMD_INIT,
220 };
221
222 return pdsc_devcmd(pdsc, cmd: &cmd, comp: &comp, max_seconds: pdsc->devcmd_timeout);
223}
224
225int pdsc_devcmd_reset(struct pdsc *pdsc)
226{
227 union pds_core_dev_comp comp = {};
228 union pds_core_dev_cmd cmd = {
229 .reset.opcode = PDS_CORE_CMD_RESET,
230 };
231
232 if (!pdsc_is_fw_running(pdsc))
233 return 0;
234
235 return pdsc_devcmd(pdsc, cmd: &cmd, comp: &comp, max_seconds: pdsc->devcmd_timeout);
236}
237
238static int pdsc_devcmd_identify_locked(struct pdsc *pdsc)
239{
240 union pds_core_dev_comp comp = {};
241 union pds_core_dev_cmd cmd = {
242 .identify.opcode = PDS_CORE_CMD_IDENTIFY,
243 .identify.ver = PDS_CORE_IDENTITY_VERSION_1,
244 };
245
246 return pdsc_devcmd_locked(pdsc, cmd: &cmd, comp: &comp, max_seconds: pdsc->devcmd_timeout);
247}
248
249static void pdsc_init_devinfo(struct pdsc *pdsc)
250{
251 pdsc->dev_info.asic_type = ioread8(&pdsc->info_regs->asic_type);
252 pdsc->dev_info.asic_rev = ioread8(&pdsc->info_regs->asic_rev);
253 pdsc->fw_generation = PDS_CORE_FW_STS_F_GENERATION &
254 ioread8(&pdsc->info_regs->fw_status);
255
256 memcpy_fromio(pdsc->dev_info.fw_version,
257 pdsc->info_regs->fw_version,
258 PDS_CORE_DEVINFO_FWVERS_BUFLEN);
259 pdsc->dev_info.fw_version[PDS_CORE_DEVINFO_FWVERS_BUFLEN] = 0;
260
261 memcpy_fromio(pdsc->dev_info.serial_num,
262 pdsc->info_regs->serial_num,
263 PDS_CORE_DEVINFO_SERIAL_BUFLEN);
264 pdsc->dev_info.serial_num[PDS_CORE_DEVINFO_SERIAL_BUFLEN] = 0;
265
266 dev_dbg(pdsc->dev, "fw_version %s\n", pdsc->dev_info.fw_version);
267}
268
269static int pdsc_identify(struct pdsc *pdsc)
270{
271 struct pds_core_drv_identity drv = {};
272 size_t sz;
273 int err;
274 int n;
275
276 drv.drv_type = cpu_to_le32(PDS_DRIVER_LINUX);
277 /* Catching the return quiets a Wformat-truncation complaint */
278 n = snprintf(buf: drv.driver_ver_str, size: sizeof(drv.driver_ver_str),
279 fmt: "%s %s", PDS_CORE_DRV_NAME, utsname()->release);
280 if (n > sizeof(drv.driver_ver_str))
281 dev_dbg(pdsc->dev, "release name truncated, don't care\n");
282
283 /* Next let's get some info about the device
284 * We use the devcmd_lock at this level in order to
285 * get safe access to the cmd_regs->data before anyone
286 * else can mess it up
287 */
288 mutex_lock(&pdsc->devcmd_lock);
289
290 sz = min_t(size_t, sizeof(drv), sizeof(pdsc->cmd_regs->data));
291 memcpy_toio(&pdsc->cmd_regs->data, &drv, sz);
292
293 err = pdsc_devcmd_identify_locked(pdsc);
294 if (!err) {
295 sz = min_t(size_t, sizeof(pdsc->dev_ident),
296 sizeof(pdsc->cmd_regs->data));
297 memcpy_fromio(&pdsc->dev_ident, &pdsc->cmd_regs->data, sz);
298 }
299 mutex_unlock(lock: &pdsc->devcmd_lock);
300
301 if (err) {
302 dev_err(pdsc->dev, "Cannot identify device: %pe\n",
303 ERR_PTR(err));
304 return err;
305 }
306
307 if (isprint(pdsc->dev_info.fw_version[0]) &&
308 isascii(pdsc->dev_info.fw_version[0]))
309 dev_info(pdsc->dev, "FW: %.*s\n",
310 (int)(sizeof(pdsc->dev_info.fw_version) - 1),
311 pdsc->dev_info.fw_version);
312 else
313 dev_info(pdsc->dev, "FW: (invalid string) 0x%02x 0x%02x 0x%02x 0x%02x ...\n",
314 (u8)pdsc->dev_info.fw_version[0],
315 (u8)pdsc->dev_info.fw_version[1],
316 (u8)pdsc->dev_info.fw_version[2],
317 (u8)pdsc->dev_info.fw_version[3]);
318
319 return 0;
320}
321
322void pdsc_dev_uninit(struct pdsc *pdsc)
323{
324 if (pdsc->intr_info) {
325 int i;
326
327 for (i = 0; i < pdsc->nintrs; i++)
328 pdsc_intr_free(pdsc, index: i);
329
330 kfree(objp: pdsc->intr_info);
331 pdsc->intr_info = NULL;
332 pdsc->nintrs = 0;
333 }
334
335 pci_free_irq_vectors(dev: pdsc->pdev);
336}
337
338int pdsc_dev_init(struct pdsc *pdsc)
339{
340 unsigned int nintrs;
341 int err;
342
343 /* Initial init and reset of device */
344 pdsc_init_devinfo(pdsc);
345 pdsc->devcmd_timeout = PDS_CORE_DEVCMD_TIMEOUT;
346
347 err = pdsc_devcmd_reset(pdsc);
348 if (err)
349 return err;
350
351 err = pdsc_identify(pdsc);
352 if (err)
353 return err;
354
355 pdsc_debugfs_add_ident(pdsc);
356
357 /* Now we can reserve interrupts */
358 nintrs = le32_to_cpu(pdsc->dev_ident.nintrs);
359 nintrs = min_t(unsigned int, num_online_cpus(), nintrs);
360
361 /* Get intr_info struct array for tracking */
362 pdsc->intr_info = kcalloc(nintrs, sizeof(*pdsc->intr_info), GFP_KERNEL);
363 if (!pdsc->intr_info)
364 return -ENOMEM;
365
366 err = pci_alloc_irq_vectors(dev: pdsc->pdev, min_vecs: nintrs, max_vecs: nintrs, PCI_IRQ_MSIX);
367 if (err != nintrs) {
368 dev_err(pdsc->dev, "Can't get %d intrs from OS: %pe\n",
369 nintrs, ERR_PTR(err));
370 err = -ENOSPC;
371 goto err_out;
372 }
373 pdsc->nintrs = nintrs;
374
375 return 0;
376
377err_out:
378 kfree(objp: pdsc->intr_info);
379 pdsc->intr_info = NULL;
380
381 return err;
382}
383

source code of linux/drivers/net/ethernet/amd/pds_core/dev.c