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irqchip/gic-v3-its: Limit memreserve cpuhp state lifetime
The new memreserve cpuhp callback only needs to survive up until a point where every CPU in the system has booted once. Beyond that, it becomes a no-op and can be put in the bin. Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20211027151506.2085066-4-valentin.schneider@arm.com
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2 changed files with 17 additions and 0 deletions
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@ -5203,6 +5203,15 @@ int its_cpu_init(void)
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return 0;
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}
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static void rdist_memreserve_cpuhp_cleanup_workfn(struct work_struct *work)
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{
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cpuhp_remove_state_nocalls(gic_rdists->cpuhp_memreserve_state);
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gic_rdists->cpuhp_memreserve_state = CPUHP_INVALID;
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}
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static DECLARE_WORK(rdist_memreserve_cpuhp_cleanup_work,
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rdist_memreserve_cpuhp_cleanup_workfn);
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static int its_cpu_memreserve_lpi(unsigned int cpu)
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{
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struct page *pend_page;
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@ -5231,6 +5240,10 @@ static int its_cpu_memreserve_lpi(unsigned int cpu)
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}
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out:
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/* Last CPU being brought up gets to issue the cleanup */
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if (cpumask_equal(&cpus_booted_once_mask, cpu_possible_mask))
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schedule_work(&rdist_memreserve_cpuhp_cleanup_work);
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gic_data_rdist()->flags |= RD_LOCAL_MEMRESERVE_DONE;
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return ret;
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}
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@ -5425,6 +5438,7 @@ int __init its_lpi_memreserve_init(void)
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if (!efi_enabled(EFI_CONFIG_TABLES))
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return 0;
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gic_rdists->cpuhp_memreserve_state = CPUHP_INVALID;
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state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
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"irqchip/arm/gicv3/memreserve:online",
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its_cpu_memreserve_lpi,
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@ -5432,6 +5446,8 @@ int __init its_lpi_memreserve_init(void)
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if (state < 0)
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return state;
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gic_rdists->cpuhp_memreserve_state = state;
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return 0;
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}
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@ -624,6 +624,7 @@ struct rdists {
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u64 flags;
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u32 gicd_typer;
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u32 gicd_typer2;
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int cpuhp_memreserve_state;
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bool has_vlpis;
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bool has_rvpeid;
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bool has_direct_lpi;
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