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lib: sbi: Counter info width should be zero indexed

The mhpm bits represent the number of bits available in mhpmcounter
while counter width describes a zero indexed value. Fix the counter width
calculation.

Fixes: 13d40f21d588 ("lib: sbi: Add PMU support")
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Atish Patra před 2 roky
rodič
revize
b628cfd6a0
1 změnil soubory, kde provedl 1 přidání a 1 odebrání
  1. 1 1
      lib/sbi/sbi_pmu.c

+ 1 - 1
lib/sbi/sbi_pmu.c

@@ -649,7 +649,7 @@ int sbi_pmu_ctr_get_info(uint32_t cidx, unsigned long *ctr_info)
 		if (cidx == 0 || cidx == 2)
 			cinfo.width = 63;
 		else
-			cinfo.width = sbi_hart_mhpm_bits(scratch);
+			cinfo.width = sbi_hart_mhpm_bits(scratch) - 1;
 	} else {
 		/* it's a firmware counter */
 		cinfo.type = SBI_PMU_CTR_TYPE_FW;