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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(100, 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(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, cmd->opcode, max_seconds);
194
195 if ((err == -ENXIO || err == -ETIMEDOUT) && pdsc->wq)
196 queue_work(pdsc->wq, &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(&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, &comp, 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 return pdsc_devcmd(pdsc, &cmd, &comp, pdsc->devcmd_timeout);
233}
234
235static int pdsc_devcmd_identify_locked(struct pdsc *pdsc)
236{
237 union pds_core_dev_comp comp = {};
238 union pds_core_dev_cmd cmd = {
239 .identify.opcode = PDS_CORE_CMD_IDENTIFY,
240 .identify.ver = PDS_CORE_IDENTITY_VERSION_1,
241 };
242
243 return pdsc_devcmd_locked(pdsc, &cmd, &comp, pdsc->devcmd_timeout);
244}
245
246static void pdsc_init_devinfo(struct pdsc *pdsc)
247{
248 pdsc->dev_info.asic_type = ioread8(&pdsc->info_regs->asic_type);
249 pdsc->dev_info.asic_rev = ioread8(&pdsc->info_regs->asic_rev);
250 pdsc->fw_generation = PDS_CORE_FW_STS_F_GENERATION &
251 ioread8(&pdsc->info_regs->fw_status);
252
253 memcpy_fromio(pdsc->dev_info.fw_version,
254 pdsc->info_regs->fw_version,
255 PDS_CORE_DEVINFO_FWVERS_BUFLEN);
256 pdsc->dev_info.fw_version[PDS_CORE_DEVINFO_FWVERS_BUFLEN] = 0;
257
258 memcpy_fromio(pdsc->dev_info.serial_num,
259 pdsc->info_regs->serial_num,
260 PDS_CORE_DEVINFO_SERIAL_BUFLEN);
261 pdsc->dev_info.serial_num[PDS_CORE_DEVINFO_SERIAL_BUFLEN] = 0;
262
263 dev_dbg(pdsc->dev, "fw_version %s\n", pdsc->dev_info.fw_version);
264}
265
266static int pdsc_identify(struct pdsc *pdsc)
267{
268 struct pds_core_drv_identity drv = {};
269 size_t sz;
270 int err;
271 int n;
272
273 drv.drv_type = cpu_to_le32(PDS_DRIVER_LINUX);
274 /* Catching the return quiets a Wformat-truncation complaint */
275 n = snprintf(drv.driver_ver_str, sizeof(drv.driver_ver_str),
276 "%s %s", PDS_CORE_DRV_NAME, utsname()->release);
277 if (n > sizeof(drv.driver_ver_str))
278 dev_dbg(pdsc->dev, "release name truncated, don't care\n");
279
280 /* Next let's get some info about the device
281 * We use the devcmd_lock at this level in order to
282 * get safe access to the cmd_regs->data before anyone
283 * else can mess it up
284 */
285 mutex_lock(&pdsc->devcmd_lock);
286
287 sz = min_t(size_t, sizeof(drv), sizeof(pdsc->cmd_regs->data));
288 memcpy_toio(&pdsc->cmd_regs->data, &drv, sz);
289
290 err = pdsc_devcmd_identify_locked(pdsc);
291 if (!err) {
292 sz = min_t(size_t, sizeof(pdsc->dev_ident),
293 sizeof(pdsc->cmd_regs->data));
294 memcpy_fromio(&pdsc->dev_ident, &pdsc->cmd_regs->data, sz);
295 }
296 mutex_unlock(&pdsc->devcmd_lock);
297
298 if (err) {
299 dev_err(pdsc->dev, "Cannot identify device: %pe\n",
300 ERR_PTR(err));
301 return err;
302 }
303
304 if (isprint(pdsc->dev_info.fw_version[0]) &&
305 isascii(pdsc->dev_info.fw_version[0]))
306 dev_info(pdsc->dev, "FW: %.*s\n",
307 (int)(sizeof(pdsc->dev_info.fw_version) - 1),
308 pdsc->dev_info.fw_version);
309 else
310 dev_info(pdsc->dev, "FW: (invalid string) 0x%02x 0x%02x 0x%02x 0x%02x ...\n",
311 (u8)pdsc->dev_info.fw_version[0],
312 (u8)pdsc->dev_info.fw_version[1],
313 (u8)pdsc->dev_info.fw_version[2],
314 (u8)pdsc->dev_info.fw_version[3]);
315
316 return 0;
317}
318
319int pdsc_dev_init(struct pdsc *pdsc)
320{
321 unsigned int nintrs;
322 int err;
323
324 /* Initial init and reset of device */
325 pdsc_init_devinfo(pdsc);
326 pdsc->devcmd_timeout = PDS_CORE_DEVCMD_TIMEOUT;
327
328 err = pdsc_devcmd_reset(pdsc);
329 if (err)
330 return err;
331
332 err = pdsc_identify(pdsc);
333 if (err)
334 return err;
335
336 pdsc_debugfs_add_ident(pdsc);
337
338 /* Now we can reserve interrupts */
339 nintrs = le32_to_cpu(pdsc->dev_ident.nintrs);
340 nintrs = min_t(unsigned int, num_online_cpus(), nintrs);
341
342 /* Get intr_info struct array for tracking */
343 pdsc->intr_info = kcalloc(nintrs, sizeof(*pdsc->intr_info), GFP_KERNEL);
344 if (!pdsc->intr_info) {
345 err = -ENOMEM;
346 goto err_out;
347 }
348
349 err = pci_alloc_irq_vectors(pdsc->pdev, nintrs, nintrs, PCI_IRQ_MSIX);
350 if (err != nintrs) {
351 dev_err(pdsc->dev, "Can't get %d intrs from OS: %pe\n",
352 nintrs, ERR_PTR(err));
353 err = -ENOSPC;
354 goto err_out;
355 }
356 pdsc->nintrs = nintrs;
357
358 return 0;
359
360err_out:
361 kfree(pdsc->intr_info);
362 pdsc->intr_info = NULL;
363
364 return err;
365}