[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <20241014065739.656959-1-sunilvl@ventanamicro.com>
Date: Mon, 14 Oct 2024 12:27:39 +0530
From: Sunil V L <sunilvl@...tanamicro.com>
To: linux-riscv@...ts.infradead.org,
linux-kernel@...r.kernel.org
Cc: Anup Patel <anup@...infault.org>,
Thomas Gleixner <tglx@...utronix.de>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
Sunil V L <sunilvl@...tanamicro.com>,
Björn Töpel <bjorn@...nel.org>
Subject: [PATCH] irqchip/riscv-intc: Fix no-SMP boot with ACPI
When CONFIG_SMP is disabled, the static array rintc_acpi_data with size
NR_CPUS will not be sufficient to hold all RINTC structures passed from
the firmware. All RINTC structures are required to configure
IMSIC/APLIC/PLIC properly irrespective of SMP in the OS. So, allocate
dynamic memory based on the number of RINTC structures in MADT to fix
this issue.
Fixes: f8619b66bdb1 ("irqchip/riscv-intc: Add ACPI support for AIA")
Reported-by: Björn Töpel <bjorn@...nel.org>
Closes: https://github.com/linux-riscv/linux-riscv/actions/runs/11280997511/job/31375229012
Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
---
drivers/irqchip/irq-riscv-intc.c | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/drivers/irqchip/irq-riscv-intc.c b/drivers/irqchip/irq-riscv-intc.c
index 8c5411386220..f653c13de62b 100644
--- a/drivers/irqchip/irq-riscv-intc.c
+++ b/drivers/irqchip/irq-riscv-intc.c
@@ -265,7 +265,7 @@ struct rintc_data {
};
static u32 nr_rintc;
-static struct rintc_data *rintc_acpi_data[NR_CPUS];
+static struct rintc_data **rintc_acpi_data;
#define for_each_matching_plic(_plic_id) \
unsigned int _plic; \
@@ -329,13 +329,30 @@ int acpi_rintc_get_imsic_mmio_info(u32 index, struct resource *res)
return 0;
}
+static int __init riscv_intc_acpi_match(union acpi_subtable_headers *header,
+ const unsigned long end)
+{
+ return 0;
+}
+
static int __init riscv_intc_acpi_init(union acpi_subtable_headers *header,
const unsigned long end)
{
struct acpi_madt_rintc *rintc;
struct fwnode_handle *fn;
+ int count;
int rc;
+ if (!rintc_acpi_data) {
+ count = acpi_table_parse_madt(ACPI_MADT_TYPE_RINTC, riscv_intc_acpi_match, 0);
+ if (count <= 0)
+ return -EINVAL;
+
+ rintc_acpi_data = kcalloc(count, sizeof(*rintc_acpi_data), GFP_KERNEL);
+ if (!rintc_acpi_data)
+ return -ENOMEM;
+ }
+
rintc = (struct acpi_madt_rintc *)header;
rintc_acpi_data[nr_rintc] = kzalloc(sizeof(*rintc_acpi_data[0]), GFP_KERNEL);
if (!rintc_acpi_data[nr_rintc])
--
2.43.0
Powered by blists - more mailing lists