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ppc/pnv: Improve pervasive topology calculation for big-core

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Big (SMT8) cores have a complicated function to map the core, thread ID
to pervasive topology (PIR). Fix this for power8, power9, and power10.

Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Caleb Schlossin <calebs@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
This commit is contained in:
Caleb Schlossin 2024-02-27 14:36:23 -06:00 • committed by Nicholas Piggin
parent 0b8893236e
commit 9940412ae4
5 changed files with 57 additions and 28 deletions
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3
target/ppc/misc_helper.c
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@ -49,9 +49,6 @@ void helper_spr_core_write_generic(CPUPPCState *env, uint32_t sprn,
CPUState *cs = env_cpu(env);
CPUState *ccs;
uint32_t nr_threads = cs->nr_threads;
uint32_t core_id = env->spr[SPR_PIR] & ~(nr_threads - 1);
assert(core_id == env->spr[SPR_PIR] - env->spr[SPR_TIR]);
if (nr_threads == 1) {
env->spr[sprn] = val;