Re: [PATCH 13/14] drm/i915/guc/slpc: Add SLPC selftest

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Hi Vinay,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm-tip/drm-tip]
[cannot apply to drm-intel/for-linux-next drm-exynos/exynos-drm-next tegra-drm/drm/tegra/for-next drm/drm-next v5.14-rc3 next-20210729]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Vinay-Belgaumkar/drm-i915-guc-slpc-Enable-GuC-based-power-management-features/20210729-051427
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
config: i386-randconfig-c001-20210728 (attached as .config)
compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/4567ad693d6988c728447d59050390e308ce6fb0
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Vinay-Belgaumkar/drm-i915-guc-slpc-Enable-GuC-based-power-management-features/20210729-051427
        git checkout 4567ad693d6988c728447d59050390e308ce6fb0
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   In file included from drivers/gpu/drm/i915/gt/intel_rps.c:2333:
>> drivers/gpu/drm/i915/gt/selftest_slpc.c:37:5: error: no previous prototype for 'live_slpc_clamp_min' [-Werror=missing-prototypes]
      37 | int live_slpc_clamp_min(void *arg)
         |     ^~~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/i915/gt/selftest_slpc.c:164:5: error: no previous prototype for 'live_slpc_clamp_max' [-Werror=missing-prototypes]
     164 | int live_slpc_clamp_max(void *arg)
         |     ^~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +/live_slpc_clamp_min +37 drivers/gpu/drm/i915/gt/selftest_slpc.c

    36	
  > 37	int live_slpc_clamp_min(void *arg)
    38	{
    39		struct drm_i915_private *i915 = arg;
    40		struct intel_gt *gt = &i915->gt;
    41		struct intel_guc_slpc *slpc = &gt->uc.guc.slpc;
    42		struct intel_rps *rps = &gt->rps;
    43		struct intel_engine_cs *engine;
    44		enum intel_engine_id id;
    45		struct igt_spinner spin;
    46		u32 slpc_min_freq, slpc_max_freq;
    47		int err = 0;
    48	
    49		if (!intel_uc_uses_guc_slpc(&gt->uc))
    50			return 0;
    51	
    52		if (igt_spinner_init(&spin, gt))
    53			return -ENOMEM;
    54	
    55		if (intel_guc_slpc_get_max_freq(slpc, &slpc_max_freq)) {
    56			pr_err("Could not get SLPC max freq\n");
    57			return -EIO;
    58		}
    59	
    60		if (intel_guc_slpc_get_min_freq(slpc, &slpc_min_freq)) {
    61			pr_err("Could not get SLPC min freq\n");
    62			return -EIO;
    63		}
    64	
    65		if (slpc_min_freq == slpc_max_freq) {
    66			pr_err("Min/Max are fused to the same value\n");
    67			return -EINVAL;
    68		}
    69	
    70		intel_gt_pm_wait_for_idle(gt);
    71		intel_gt_pm_get(gt);
    72		for_each_engine(engine, gt, id) {
    73			struct i915_request *rq;
    74			u32 step, min_freq, req_freq;
    75			u32 act_freq, max_act_freq;
    76	
    77			if (!intel_engine_can_store_dword(engine))
    78				continue;
    79	
    80			/* Go from min to max in 5 steps */
    81			step = (slpc_max_freq - slpc_min_freq) / NUM_STEPS;
    82			max_act_freq = slpc_min_freq;
    83			for (min_freq = slpc_min_freq; min_freq < slpc_max_freq;
    84						min_freq += step) {
    85				err = slpc_set_min_freq(slpc, min_freq);
    86				if (err)
    87					break;
    88	
    89				st_engine_heartbeat_disable(engine);
    90	
    91				rq = igt_spinner_create_request(&spin,
    92						engine->kernel_context,
    93						MI_NOOP);
    94				if (IS_ERR(rq)) {
    95					err = PTR_ERR(rq);
    96					st_engine_heartbeat_enable(engine);
    97					break;
    98				}
    99	
   100				i915_request_add(rq);
   101	
   102				if (!igt_wait_for_spinner(&spin, rq)) {
   103					pr_err("%s: Spinner did not start\n",
   104						engine->name);
   105					igt_spinner_end(&spin);
   106					st_engine_heartbeat_enable(engine);
   107					intel_gt_set_wedged(engine->gt);
   108					err = -EIO;
   109					break;
   110				}
   111	
   112				/* Wait for GuC to detect business and raise
   113				 * requested frequency if necessary.
   114				 */
   115				delay_for_h2g();
   116	
   117				req_freq = intel_rps_read_punit_req_frequency(rps);
   118	
   119				/* GuC requests freq in multiples of 50/3 MHz */
   120				if (req_freq < (min_freq - 50/3)) {
   121					pr_err("SWReq is %d, should be at least %d\n", req_freq,
   122						min_freq - 50/3);
   123					igt_spinner_end(&spin);
   124					st_engine_heartbeat_enable(engine);
   125					err = -EINVAL;
   126					break;
   127				}
   128	
   129				act_freq =  intel_rps_read_actual_frequency(rps);
   130				if (act_freq > max_act_freq)
   131					max_act_freq = act_freq;
   132	
   133				igt_spinner_end(&spin);
   134				st_engine_heartbeat_enable(engine);
   135			}
   136	
   137			pr_info("Max actual frequency for %s was %d\n",
   138					engine->name, max_act_freq);
   139	
   140			/* Actual frequency should rise above min */
   141			if (max_act_freq == slpc_min_freq) {
   142				pr_err("Actual freq did not rise above min\n");
   143				err = -EINVAL;
   144			}
   145	
   146			if (err)
   147				break;
   148		}
   149	
   150		/* Restore min/max frequencies */
   151		slpc_set_max_freq(slpc, slpc_max_freq);
   152		slpc_set_min_freq(slpc, slpc_min_freq);
   153	
   154		if (igt_flush_test(gt->i915))
   155			err = -EIO;
   156	
   157		intel_gt_pm_put(gt);
   158		igt_spinner_fini(&spin);
   159		intel_gt_pm_wait_for_idle(gt);
   160	
   161		return err;
   162	}
   163	
 > 164	int live_slpc_clamp_max(void *arg)
   165	{
   166		struct drm_i915_private *i915 = arg;
   167		struct intel_gt *gt = &i915->gt;
   168		struct intel_guc_slpc *slpc;
   169		struct intel_rps *rps;
   170		struct intel_engine_cs *engine;
   171		enum intel_engine_id id;
   172		struct igt_spinner spin;
   173		int err = 0;
   174		u32 slpc_min_freq, slpc_max_freq;
   175	
   176		slpc = &gt->uc.guc.slpc;
   177		rps = &gt->rps;
   178	
   179		if (!intel_uc_uses_guc_slpc(&gt->uc))
   180			return 0;
   181	
   182		if (igt_spinner_init(&spin, gt))
   183			return -ENOMEM;
   184	
   185		if (intel_guc_slpc_get_max_freq(slpc, &slpc_max_freq)) {
   186			pr_err("Could not get SLPC max freq\n");
   187			return -EIO;
   188		}
   189	
   190		if (intel_guc_slpc_get_min_freq(slpc, &slpc_min_freq)) {
   191			pr_err("Could not get SLPC min freq\n");
   192			return -EIO;
   193		}
   194	
   195		if (slpc_min_freq == slpc_max_freq) {
   196			pr_err("Min/Max are fused to the same value\n");
   197			return -EINVAL;
   198		}
   199	
   200		intel_gt_pm_wait_for_idle(gt);
   201		intel_gt_pm_get(gt);
   202		for_each_engine(engine, gt, id) {
   203			struct i915_request *rq;
   204			u32 max_freq, req_freq;
   205			u32 act_freq, max_act_freq;
   206			u32 step;
   207	
   208			if (!intel_engine_can_store_dword(engine))
   209				continue;
   210	
   211			/* Go from max to min in 5 steps */
   212			step = (slpc_max_freq - slpc_min_freq) / NUM_STEPS;
   213			max_act_freq = slpc_min_freq;
   214			for (max_freq = slpc_max_freq; max_freq > slpc_min_freq;
   215						max_freq -= step) {
   216				err = slpc_set_max_freq(slpc, max_freq);
   217				if (err)
   218					break;
   219	
   220				st_engine_heartbeat_disable(engine);
   221	
   222				rq = igt_spinner_create_request(&spin,
   223							engine->kernel_context,
   224							MI_NOOP);
   225				if (IS_ERR(rq)) {
   226					st_engine_heartbeat_enable(engine);
   227					err = PTR_ERR(rq);
   228					break;
   229				}
   230	
   231				i915_request_add(rq);
   232	
   233				if (!igt_wait_for_spinner(&spin, rq)) {
   234					pr_err("%s: SLPC spinner did not start\n",
   235					       engine->name);
   236					igt_spinner_end(&spin);
   237					st_engine_heartbeat_enable(engine);
   238					intel_gt_set_wedged(engine->gt);
   239					err = -EIO;
   240					break;
   241				}
   242	
   243				delay_for_h2g();
   244	
   245				/* Verify that SWREQ indeed was set to specific value */
   246				req_freq = intel_rps_read_punit_req_frequency(rps);
   247	
   248				/* GuC requests freq in multiples of 50/3 MHz */
   249				if (req_freq > (max_freq + 50/3)) {
   250					pr_err("SWReq is %d, should be at most %d\n", req_freq,
   251						max_freq + 50/3);
   252					igt_spinner_end(&spin);
   253					st_engine_heartbeat_enable(engine);
   254					err = -EINVAL;
   255					break;
   256				}
   257	
   258				act_freq =  intel_rps_read_actual_frequency(rps);
   259				if (act_freq > max_act_freq)
   260					max_act_freq = act_freq;
   261	
   262				st_engine_heartbeat_enable(engine);
   263				igt_spinner_end(&spin);
   264	
   265				if (err)
   266					break;
   267			}
   268	
   269			pr_info("Max actual frequency for %s was %d\n",
   270					engine->name, max_act_freq);
   271	
   272			/* Actual frequency should rise above min */
   273			if (max_act_freq == slpc_min_freq) {
   274				pr_err("Actual freq did not rise above min\n");
   275				err = -EINVAL;
   276			}
   277	
   278			if (igt_flush_test(gt->i915)) {
   279				err = -EIO;
   280				break;
   281			}
   282	
   283			if (err)
   284				break;
   285		}
   286	
   287		/* Restore min/max freq */
   288		slpc_set_max_freq(slpc, slpc_max_freq);
   289		slpc_set_min_freq(slpc, slpc_min_freq);
   290	
   291		intel_gt_pm_put(gt);
   292		igt_spinner_fini(&spin);
   293		intel_gt_pm_wait_for_idle(gt);
   294	
   295		return err;
   296	}
   297	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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