From: Valentin Schneider <valentin.schneider@arm.com>
To: linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Cc: Will Deacon <will@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Marc Zyngier <maz@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Ard Biesheuvel <ardb@kernel.org>
Subject: [PATCH v2 1/3] irqchip/gic-v3-its: Give the percpu rdist struct its own flags field
Date: Wed, 27 Oct 2021 16:15:04 +0100 [thread overview]
Message-ID: <20211027151506.2085066-2-valentin.schneider@arm.com> (raw)
In-Reply-To: <20211027151506.2085066-1-valentin.schneider@arm.com>
Later patches will require tracking some per-rdist status. Reuse the bytes
"lost" to padding within the __percpu rdist struct as a flags field, and
re-encode ->lpi_enabled within said flags.
No change in functionality intended.
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
---
drivers/irqchip/irq-gic-v3-its.c | 8 +++++---
include/linux/irqchip/arm-gic-v3.h | 2 +-
2 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index eb0882d15366..74c22741f3ce 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -46,6 +46,8 @@
#define RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING (1 << 0)
#define RDIST_FLAGS_RD_TABLES_PREALLOCATED (1 << 1)
+#define RD_LOCAL_LPI_ENABLED BIT(0)
+
static u32 lpi_id_bits;
/*
@@ -3044,7 +3046,7 @@ static void its_cpu_init_lpis(void)
phys_addr_t paddr;
u64 val, tmp;
- if (gic_data_rdist()->lpi_enabled)
+ if (gic_data_rdist()->flags & RD_LOCAL_LPI_ENABLED)
return;
val = readl_relaxed(rbase + GICR_CTLR);
@@ -3158,7 +3160,7 @@ static void its_cpu_init_lpis(void)
/* Make sure the GIC has seen the above */
dsb(sy);
out:
- gic_data_rdist()->lpi_enabled = true;
+ gic_data_rdist()->flags |= RD_LOCAL_LPI_ENABLED;
pr_info("GICv3: CPU%d: using %s LPI pending table @%pa\n",
smp_processor_id(),
gic_data_rdist()->pend_page ? "allocated" : "reserved",
@@ -5138,7 +5140,7 @@ static int redist_disable_lpis(void)
*
* If running with preallocated tables, there is nothing to do.
*/
- if (gic_data_rdist()->lpi_enabled ||
+ if ((gic_data_rdist()->flags & RD_LOCAL_LPI_ENABLED) ||
(gic_rdists->flags & RDIST_FLAGS_RD_TABLES_PREALLOCATED))
return 0;
diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
index 81cbf85f73de..0dc34d7d735a 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -615,7 +615,7 @@ struct rdists {
void __iomem *rd_base;
struct page *pend_page;
phys_addr_t phys_base;
- bool lpi_enabled;
+ u64 flags;
cpumask_t *vpe_table_mask;
void *vpe_l1_base;
} __percpu *rdist;
--
2.25.1
next prev parent reply other threads:[~2021-10-27 15:15 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-27 15:15 [PATCH v2 0/3] irqchip/gic-v3-its: Fix LPI pending table handling vs PREEMPT_RT Valentin Schneider
2021-10-27 15:15 ` Valentin Schneider [this message]
2021-12-16 13:30 ` [irqchip: irq/irqchip-next] irqchip/gic-v3-its: Give the percpu rdist struct its own flags field irqchip-bot for Valentin Schneider
2021-10-27 15:15 ` [PATCH v2 2/3] irqchip/gic-v3-its: Postpone LPI pending table freeing and memreserve Valentin Schneider
2021-12-16 13:30 ` [irqchip: irq/irqchip-next] " irqchip-bot for Valentin Schneider
2021-10-27 15:15 ` [PATCH v2 3/3] irqchip/gic-v3-its: Limit memreserve cpuhp state lifetime Valentin Schneider
2021-12-16 13:30 ` [irqchip: irq/irqchip-next] " irqchip-bot for Valentin Schneider
2021-11-19 11:14 ` [PATCH v2 0/3] irqchip/gic-v3-its: Fix LPI pending table handling vs PREEMPT_RT Sebastian Andrzej Siewior
2021-11-19 12:28 ` Marc Zyngier
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