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irqchip/gic-v3: Spell out when pseudo-NMIs are enabled 

When NMIs cannot be enabled, the driver prints a message stating that
unambiguously. When they are enabled, the only feedback we get is a message
regarding the use of synchronization for ICC_PMR_EL1 writes, which is not
as useful for a user who is not intimately familiar with how NMIs are
implemented.

Let's make it obvious that pseudo-NMIs are enabled. Keep the message about
using a barrier for ICC_PMR_EL1 writes, because it has a non-negligible
impact on performance.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200912153707.667731-2-alexandru.elisei@arm.com
This commit is contained in:
Alexandru Elisei 2020-09-12 16:37:06 +01:00 committed by Marc Zyngier
parent f4d51dffc6
commit 4e594ad106
1 changed files with 2 additions and 2 deletions
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4
drivers/irqchip/irq-gic-v3.c
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@ -1564,8 +1564,8 @@ static void gic_enable_nmi_support(void)
if (gic_read_ctlr() & ICC_CTLR_EL1_PMHE_MASK)
static_branch_enable(&gic_pmr_sync);
pr_info("%s ICC_PMR_EL1 synchronisation\n",
static_branch_unlikely(&gic_pmr_sync) ? "Forcing" : "Relaxing");
pr_info("Pseudo-NMIs enabled using %s ICC_PMR_EL1 synchronisation\n",
static_branch_unlikely(&gic_pmr_sync) ? "forced" : "relaxed");
static_branch_enable(&supports_pseudo_nmis);