Quoting Dan Carpenter (2020-04-29 14:23:45)
> Hello Chris Wilson,
>
> The patch 9c878557b1eb: "drm/i915/gt: Use the RPM config register to
> determine clk frequencies" from Apr 24, 2020, leads to the following
> static checker warning:
>
> drivers/gpu/drm/i915/gt/debugfs_gt_pm.c:407 frequency_show()
> error: uninitialized symbol 'rpcurupei'.
>
> drivers/gpu/drm/i915/gt/debugfs_gt_pm.c
> 298 } else if (INTEL_GEN(i915) >= 6) {
> 299 u32 rp_state_limits;
> 300 u32 gt_perf_status;
> 301 u32 rp_state_cap;
> 302 u32 rpmodectl, rpinclimit, rpdeclimit;
> 303 u32 rpstat, cagf, reqf;
> 304 u32 rpcurupei, rpcurup, rpprevup;
> ^^^^^^^^^
>
> 305 u32 rpcurdownei, rpcurdown, rpprevdown;
> 306 u32 rpupei, rpupt, rpdownei, rpdownt;
> 307 u32 pm_ier, pm_imr, pm_isr, pm_iir, pm_mask;
> 308 int max_freq;
> 309
> 310 rp_state_limits = intel_uncore_read(uncore, GEN6_RP_STATE_LIMITS);
> 311 if (IS_GEN9_LP(i915)) {
> 312 rp_state_cap = intel_uncore_read(uncore, BXT_RP_STATE_CAP);
> 313 gt_perf_status = intel_uncore_read(uncore, BXT_GT_PERF_STATUS);
> 314 } else {
> 315 rp_state_cap = intel_uncore_read(uncore, GEN6_RP_STATE_CAP);
> 316 gt_perf_status = intel_uncore_read(uncore, GEN6_GT_PERF_STATUS);
> 317 }
> 318
> 319 /* RPSTAT1 is in the GT power well */
> 320 intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL);
> 321
> 322 reqf = intel_uncore_read(uncore, GEN6_RPNSWREQ);
> 323 if (INTEL_GEN(i915) >= 9) {
> 324 reqf >>= 23;
> 325 } else {
> 326 reqf &= ~GEN6_TURBO_DISABLE;
> 327 if (IS_HASWELL(i915) || IS_BROADWELL(i915))
> 328 reqf >>= 24;
> 329 else
> 330 reqf >>= 25;
> 331 }
> 332 reqf = intel_gpu_freq(rps, reqf);
> 333
> 334 rpmodectl = intel_uncore_read(uncore, GEN6_RP_CONTROL);
> 335 rpinclimit = intel_uncore_read(uncore, GEN6_RP_UP_THRESHOLD);
> 336 rpdeclimit = intel_uncore_read(uncore, GEN6_RP_DOWN_THRESHOLD);
> 337
> 338 rpstat = intel_uncore_read(uncore, GEN6_RPSTAT1);
> 339 rpupei = intel_uncore_read(uncore, GEN6_RP_CUR_UP_EI) & GEN6_CURICONT_MASK;
> 340 rpcurup = intel_uncore_read(uncore, GEN6_RP_CUR_UP) & GEN6_CURBSYTAVG_MASK;
> 341 rpprevup = intel_uncore_read(uncore, GEN6_RP_PREV_UP) & GEN6_CURBSYTAVG_MASK;
> 342 rpcurdownei = intel_uncore_read(uncore, GEN6_RP_CUR_DOWN_EI) & GEN6_CURIAVG_MASK;
> 343 rpcurdown = intel_uncore_read(uncore, GEN6_RP_CUR_DOWN) & GEN6_CURBSYTAVG_MASK;
> 344 rpprevdown = intel_uncore_read(uncore, GEN6_RP_PREV_DOWN) & GEN6_CURBSYTAVG_MASK;
> 345
> 346 rpupei = intel_uncore_read(uncore, GEN6_RP_UP_EI);
> 347 rpupt = intel_uncore_read(uncore, GEN6_RP_UP_THRESHOLD);
> 348
> 349 rpdownei = intel_uncore_read(uncore, GEN6_RP_DOWN_EI);
> 350 rpdownt = intel_uncore_read(uncore, GEN6_RP_DOWN_THRESHOLD);
> 351
> 352 cagf = intel_rps_read_actual_frequency(rps);
> 353
> 354 intel_uncore_forcewake_put(uncore, FORCEWAKE_ALL);
> 355
> 356 if (INTEL_GEN(i915) >= 11) {
> 357 pm_ier = intel_uncore_read(uncore, GEN11_GPM_WGBOXPERF_INTR_ENABLE);
> 358 pm_imr = intel_uncore_read(uncore, GEN11_GPM_WGBOXPERF_INTR_MASK);
> 359 /*
> 360 * The equivalent to the PM ISR & IIR cannot be read
> 361 * without affecting the current state of the system
> 362 */
> 363 pm_isr = 0;
> 364 pm_iir = 0;
> 365 } else if (INTEL_GEN(i915) >= 8) {
> 366 pm_ier = intel_uncore_read(uncore, GEN8_GT_IER(2));
> 367 pm_imr = intel_uncore_read(uncore, GEN8_GT_IMR(2));
> 368 pm_isr = intel_uncore_read(uncore, GEN8_GT_ISR(2));
> 369 pm_iir = intel_uncore_read(uncore, GEN8_GT_IIR(2));
> 370 } else {
> 371 pm_ier = intel_uncore_read(uncore, GEN6_PMIER);
> 372 pm_imr = intel_uncore_read(uncore, GEN6_PMIMR);
> 373 pm_isr = intel_uncore_read(uncore, GEN6_PMISR);
> 374 pm_iir = intel_uncore_read(uncore, GEN6_PMIIR);
> 375 }
> 376 pm_mask = intel_uncore_read(uncore, GEN6_PMINTRMSK);
> 377
> 378 seq_printf(m, "Video Turbo Mode: %s\n",
> 379 yesno(rpmodectl & GEN6_RP_MEDIA_TURBO));
> 380 seq_printf(m, "HW control enabled: %s\n",
> 381 yesno(rpmodectl & GEN6_RP_ENABLE));
> 382 seq_printf(m, "SW control enabled: %s\n",
> 383 yesno((rpmodectl & GEN6_RP_MEDIA_MODE_MASK) ==
> 384 GEN6_RP_MEDIA_SW_MODE));
> 385
> 386 seq_printf(m, "PM IER=0x%08x IMR=0x%08x, MASK=0x%08x\n",
> 387 pm_ier, pm_imr, pm_mask);
> 388 if (INTEL_GEN(i915) <= 10)
> 389 seq_printf(m, "PM ISR=0x%08x IIR=0x%08x\n",
> 390 pm_isr, pm_iir);
> 391 seq_printf(m, "pm_intrmsk_mbz: 0x%08x\n",
> 392 rps->pm_intrmsk_mbz);
> 393 seq_printf(m, "GT_PERF_STATUS: 0x%08x\n", gt_perf_status);
> 394 seq_printf(m, "Render p-state ratio: %d\n",
> 395 (gt_perf_status & (INTEL_GEN(i915) >= 9 ? 0x1ff00 : 0xff00)) >> 8);
> 396 seq_printf(m, "Render p-state VID: %d\n",
> 397 gt_perf_status & 0xff);
> 398 seq_printf(m, "Render p-state limit: %d\n",
> 399 rp_state_limits & 0xff);
> 400 seq_printf(m, "RPSTAT1: 0x%08x\n", rpstat);
> 401 seq_printf(m, "RPMODECTL: 0x%08x\n", rpmodectl);
> 402 seq_printf(m, "RPINCLIMIT: 0x%08x\n", rpinclimit);
> 403 seq_printf(m, "RPDECLIMIT: 0x%08x\n", rpdeclimit);
> 404 seq_printf(m, "RPNSWREQ: %dMHz\n", reqf);
> 405 seq_printf(m, "CAGF: %dMHz\n", cagf);
> 406 seq_printf(m, "RP CUR UP EI: %d (%dns)\n",
> 407 rpcurupei,
> ^^^^^^^^^
> 408 intel_gt_pm_interval_to_ns(gt, rpcurupei));
> ^^^^^^^^^
> This is never initialized.
Thanks, Nathan Chancellor has provided the fix.
-Chris
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