[PATCH 06/13] perf: stm32: introduce DDRPERFM driver

[kernel test robot]

Hi Clément,

kernel test robot noticed the following build errors:

[auto build test ERROR on 86731a2a651e58953fc949573895f2fa6d456841]

url:    https://github.com/intel-lab-lkp/linux/commits/Cl-ment-Le-Goffic/bus-firewall-move-stm32_firewall-header-file-in-include-folder/20250623-173554
base:   86731a2a651e58953fc949573895f2fa6d456841
patch link:    https://lore.kernel.org/r/20250623-ddrperfm-upstream-v1-6-7dffff168090%40foss.st.com
patch subject: [PATCH 06/13] perf: stm32: introduce DDRPERFM driver
config: i386-buildonly-randconfig-002-20250624 (https://download.01.org/0day-ci/archive/20250624/202506240401.zlRG1qiO-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250624/202506240401.zlRG1qiO-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202506240401.zlRG1qiO-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/perf/stm32_ddr_pmu.c: In function 'stm32_ddr_start_counters':
>> drivers/perf/stm32_ddr_pmu.c:205:9: error: implicit declaration of function 'writel_relaxed' [-Werror=implicit-function-declaration]
     205 |         writel_relaxed(r->start.mask, pmu->membase + r->start.reg);
         |         ^~~~~~~~~~~~~~
   drivers/perf/stm32_ddr_pmu.c: In function 'stm32_ddr_clear_counter':
>> drivers/perf/stm32_ddr_pmu.c:232:22: error: implicit declaration of function 'readl_relaxed' [-Werror=implicit-function-declaration]
     232 |         u32 status = readl_relaxed(pmu->membase + r->status.reg);
         |                      ^~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/writel_relaxed +205 drivers/perf/stm32_ddr_pmu.c

   200	
   201	static void stm32_ddr_start_counters(struct stm32_ddr_pmu *pmu)
   202	{
   203		const struct stm32_ddr_pmu_regspec *r = pmu->cfg->regs;
   204	
 > 205		writel_relaxed(r->start.mask, pmu->membase + r->start.reg);
   206	}
   207	
   208	static void stm32_ddr_stop_counters(struct stm32_ddr_pmu *pmu)
   209	{
   210		const struct stm32_ddr_pmu_regspec *r = pmu->cfg->regs;
   211	
   212		writel_relaxed(r->stop.mask, pmu->membase + r->stop.reg);
   213	}
   214	
   215	static void stm32_ddr_clear_time_counter(struct stm32_ddr_pmu *pmu)
   216	{
   217		const struct stm32_ddr_pmu_regspec *r = pmu->cfg->regs;
   218	
   219		writel_relaxed(r->clear_time.mask, pmu->membase + r->clear_time.reg);
   220	}
   221	
   222	static void stm32_ddr_clear_event_counter(struct stm32_ddr_pmu *pmu, struct stm32_ddr_cnt *counter)
   223	{
   224		const struct stm32_ddr_pmu_regspec *r = pmu->cfg->regs;
   225	
   226		writel_relaxed(r->clear_cnt.mask & BIT(counter->idx), pmu->membase + r->clear_cnt.reg);
   227	}
   228	
   229	static void stm32_ddr_clear_counter(struct stm32_ddr_pmu *pmu, struct stm32_ddr_cnt *counter)
   230	{
   231		const struct stm32_ddr_pmu_regspec *r = pmu->cfg->regs;
 > 232		u32 status = readl_relaxed(pmu->membase + r->status.reg);
   233	
   234		if (counter->idx == pmu->cfg->time_cnt_idx)
   235			stm32_ddr_clear_time_counter(pmu);
   236		else
   237			stm32_ddr_clear_event_counter(pmu, counter);
   238	
   239		if (status & r->status.mask)
   240			dev_err(pmu->dev, "Failed to clear counter %i because the PMU is busy\n",
   241				counter->idx);
   242	}
   243	

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