[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20240601150411.1929783-11-sunilvl@ventanamicro.com>
Date: Sat, 1 Jun 2024 20:34:04 +0530
From: Sunil V L <sunilvl@...tanamicro.com>
To: linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
linux-riscv@...ts.infradead.org,
linux-acpi@...r.kernel.org,
linux-pci@...r.kernel.org,
acpica-devel@...ts.linux.dev
Cc: Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Len Brown <lenb@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Anup Patel <anup@...infault.org>,
Thomas Gleixner <tglx@...utronix.de>,
Samuel Holland <samuel.holland@...ive.com>,
Robert Moore <robert.moore@...el.com>,
Conor Dooley <conor.dooley@...rochip.com>,
Andrew Jones <ajones@...tanamicro.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Marc Zyngier <maz@...nel.org>,
Atish Kumar Patra <atishp@...osinc.com>,
Haibo1 Xu <haibo1.xu@...el.com>,
Björn Töpel <bjorn@...nel.org>,
Sunil V L <sunilvl@...tanamicro.com>
Subject: [PATCH v6 10/17] ACPI: RISC-V: Implement function to reorder irqchip probe entries
ACPI MADT entries for interrupt controllers don't have a way to describe
the hierarchy. However, the hierarchy is known to the architecture and
on RISC-V platforms, the MADT sub table types are ordered in the
incremental order from the root controller which is RINTC. So, add
architecture function for RISC-V to reorder the interrupt controller
probing as per the hierarchy as below.
Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
---
drivers/acpi/riscv/Makefile | 2 +-
drivers/acpi/riscv/irq.c | 32 ++++++++++++++++++++++++++++++++
2 files changed, 33 insertions(+), 1 deletion(-)
create mode 100644 drivers/acpi/riscv/irq.c
diff --git a/drivers/acpi/riscv/Makefile b/drivers/acpi/riscv/Makefile
index 877de00d1b50..a96fdf1e2cb8 100644
--- a/drivers/acpi/riscv/Makefile
+++ b/drivers/acpi/riscv/Makefile
@@ -1,4 +1,4 @@
# SPDX-License-Identifier: GPL-2.0-only
-obj-y += rhct.o init.o
+obj-y += rhct.o init.o irq.o
obj-$(CONFIG_ACPI_PROCESSOR_IDLE) += cpuidle.o
obj-$(CONFIG_ACPI_CPPC_LIB) += cppc.o
diff --git a/drivers/acpi/riscv/irq.c b/drivers/acpi/riscv/irq.c
new file mode 100644
index 000000000000..f56e103a501f
--- /dev/null
+++ b/drivers/acpi/riscv/irq.c
@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2023-2024, Ventana Micro Systems Inc
+ * Author: Sunil V L <sunilvl@...tanamicro.com>
+ *
+ */
+
+#include <linux/acpi.h>
+#include <linux/sort.h>
+
+static int irqchip_cmp_func(const void *in0, const void *in1)
+{
+ struct acpi_probe_entry *elem0 = (struct acpi_probe_entry *)in0;
+ struct acpi_probe_entry *elem1 = (struct acpi_probe_entry *)in1;
+
+ return (elem0->type > elem1->type) - (elem0->type < elem1->type);
+}
+
+/*
+ * RISC-V irqchips in MADT of ACPI spec are defined in the same order how
+ * they should be probed. Since IRQCHIP_ACPI_DECLARE doesn't define any
+ * order, this arch function will reorder the probe functions as per the
+ * required order for the architecture.
+ */
+void arch_sort_irqchip_probe(struct acpi_probe_entry *ap_head, int nr)
+{
+ struct acpi_probe_entry *ape = ap_head;
+
+ if (nr == 1 || !ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id))
+ return;
+ sort(ape, nr, sizeof(*ape), irqchip_cmp_func, NULL);
+}
--
2.40.1
Powered by blists - more mailing lists