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cpufreq: powernv: Fix init_chip_info initialization in numa=off

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In the numa=off kernel command-line configuration init_chip_info() loops
around the number of chips and attempts to copy the cpumask of that node
which is NULL for all iterations after the first chip.

Hence, store the cpu mask for each chip instead of derving cpumask from
node while populating the "chips" struct array and copy that to the
chips[i].mask

Fixes: 053819e0bf ("cpufreq: powernv: Handle throttling due to Pmax capping at chip level")
Cc: stable@vger.kernel.org # v4.3+
Reported-by: Shirisha Ganta <shirisha.ganta1@ibm.com>
Signed-off-by: Pratik R. Sampat <psampat@linux.ibm.com>
Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
[mpe: Rename goto label to out_free_chip_cpu_mask]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210728120500.87549-2-psampat@linux.ibm.com
This commit is contained in:
Pratik R. Sampat 2021-07-28 17:35:00 +05:30 committed by Michael Ellerman
parent 140a89b7bf
commit f34ee9cb2c
1 changed files with 14 additions and 2 deletions
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16
drivers/cpufreq/powernv-cpufreq.c
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@ -36,6 +36,7 @@
#define MAX_PSTATE_SHIFT 32
#define LPSTATE_SHIFT 48
#define GPSTATE_SHIFT 56
#define MAX_NR_CHIPS 32
#define MAX_RAMP_DOWN_TIME 5120
/*
@ -1046,12 +1047,20 @@ static int init_chip_info(void)
unsigned int *chip;
unsigned int cpu, i;
unsigned int prev_chip_id = UINT_MAX;
cpumask_t *chip_cpu_mask;
int ret = 0;
chip = kcalloc(num_possible_cpus(), sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
/* Allocate a chip cpu mask large enough to fit mask for all chips */
chip_cpu_mask = kcalloc(MAX_NR_CHIPS, sizeof(cpumask_t), GFP_KERNEL);
if (!chip_cpu_mask) {
ret = -ENOMEM;
goto free_and_return;
}
for_each_possible_cpu(cpu) {
unsigned int id = cpu_to_chip_id(cpu);
@ -1059,22 +1068,25 @@ static int init_chip_info(void)
prev_chip_id = id;
chip[nr_chips++] = id;
}
cpumask_set_cpu(cpu, &chip_cpu_mask[nr_chips-1]);
}
chips = kcalloc(nr_chips, sizeof(struct chip), GFP_KERNEL);
if (!chips) {
ret = -ENOMEM;
goto free_and_return;
goto out_free_chip_cpu_mask;
}
for (i = 0; i < nr_chips; i++) {
chips[i].id = chip[i];
cpumask_copy(&chips[i].mask, cpumask_of_node(chip[i]));
cpumask_copy(&chips[i].mask, &chip_cpu_mask[i]);
INIT_WORK(&chips[i].throttle, powernv_cpufreq_work_fn);
for_each_cpu(cpu, &chips[i].mask)
per_cpu(chip_info, cpu) = &chips[i];
}
out_free_chip_cpu_mask:
kfree(chip_cpu_mask);
free_and_return:
kfree(chip);
return ret;