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authorValentin Schneider <valentin.schneider@arm.com>2021-10-27 18:15:06 +0300
committerMarc Zyngier <maz@kernel.org>2021-12-16 16:21:12 +0300
commit835f442fdbce33a47a6bde356643fd7e3ef7ec1b (patch)
treeac8d9effe81e76e400447cc456cd85b2b0707530 /drivers/irqchip/irq-gic-v3-its.c
parentd23bc2bc1d634658d7fa96395419c1c553a784f0 (diff)
downloadlinux-835f442fdbce33a47a6bde356643fd7e3ef7ec1b.tar.xz
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
Diffstat (limited to 'drivers/irqchip/irq-gic-v3-its.c')
-rw-r--r--drivers/irqchip/irq-gic-v3-its.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index f860733d3e4e..ee83eb377d7e 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -5203,6 +5203,15 @@ int its_cpu_init(void)
return 0;
}
+static void rdist_memreserve_cpuhp_cleanup_workfn(struct work_struct *work)
+{
+ cpuhp_remove_state_nocalls(gic_rdists->cpuhp_memreserve_state);
+ gic_rdists->cpuhp_memreserve_state = CPUHP_INVALID;
+}
+
+static DECLARE_WORK(rdist_memreserve_cpuhp_cleanup_work,
+ rdist_memreserve_cpuhp_cleanup_workfn);
+
static int its_cpu_memreserve_lpi(unsigned int cpu)
{
struct page *pend_page;
@@ -5231,6 +5240,10 @@ static int its_cpu_memreserve_lpi(unsigned int cpu)
}
out:
+ /* Last CPU being brought up gets to issue the cleanup */
+ if (cpumask_equal(&cpus_booted_once_mask, cpu_possible_mask))
+ schedule_work(&rdist_memreserve_cpuhp_cleanup_work);
+
gic_data_rdist()->flags |= RD_LOCAL_MEMRESERVE_DONE;
return ret;
}
@@ -5425,6 +5438,7 @@ int __init its_lpi_memreserve_init(void)
if (!efi_enabled(EFI_CONFIG_TABLES))
return 0;
+ gic_rdists->cpuhp_memreserve_state = CPUHP_INVALID;
state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
"irqchip/arm/gicv3/memreserve:online",
its_cpu_memreserve_lpi,
@@ -5432,6 +5446,8 @@ int __init its_lpi_memreserve_init(void)
if (state < 0)
return state;
+ gic_rdists->cpuhp_memreserve_state = state;
+
return 0;
}