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powerpc/64: Set DSCR default initially from SPR

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Take the DSCR value set by firmware as the dscr_default value,
rather than zero.

POWER9 recommends DSCR default to a non-zero value.

Signed-off-by: From: Nicholas Piggin <npiggin@gmail.com>
[mpe: Make record_spr_defaults() __init]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
2017-10-24 21:44:44 +10:00
committed by Michael Ellerman
parent 339a3293f4
commit 1696d0fb7f
3 changed files with 26 additions and 0 deletions
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11
arch/powerpc/kernel/sysfs.c
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@@ -590,6 +590,17 @@ static void sysfs_create_dscr_default(void)
if (cpu_has_feature(CPU_FTR_DSCR))
err = device_create_file(cpu_subsys.dev_root, &dev_attr_dscr_default);
}
void __init record_spr_defaults(void)
{
int cpu;
if (cpu_has_feature(CPU_FTR_DSCR)) {
dscr_default = mfspr(SPRN_DSCR);
for (cpu = 0; cpu < nr_cpu_ids; cpu++)
paca[cpu].dscr_default = dscr_default;
}
}
#endif /* CONFIG_PPC64 */
#ifdef HAS_PPC_PMC_PA6T