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Subject[irqchip: irq/irqchip-next] irqchip/gic-v3-its: Give the percpu rdist struct its own flags field
The following commit has been merged into the irq/irqchip-next branch of irqchip:

Commit-ID: c0cdc89072a3e1ae3981437f385de14b7bba8fd8
Gitweb: https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/c0cdc89072a3e1ae3981437f385de14b7bba8fd8
Author: Valentin Schneider <valentin.schneider@arm.com>
AuthorDate: Wed, 27 Oct 2021 16:15:04 +01:00
Committer: Marc Zyngier <maz@kernel.org>
CommitterDate: Thu, 16 Dec 2021 13:21:11

irqchip/gic-v3-its: Give the percpu rdist struct its own flags field

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>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211027151506.2085066-2-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 eb0882d..74c2274 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 81cbf85..0dc34d7 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;
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