linux-kernel - [PATCH v8 06/17] ACPI: scan: Define weak function to populate dependencies

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240812005929.113499-7-sunilvl@ventanamicro.com>
Date: Mon, 12 Aug 2024 06:29:18 +0530
From: Sunil V L <sunilvl@...tanamicro.com>
To: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-riscv@...ts.infradead.org,
	linux-acpi@...r.kernel.org,
	acpica-devel@...ts.linux.dev
Cc: 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>,
	Haibo Xu <haibo1.xu@...el.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	Atish Kumar Patra <atishp@...osinc.com>,
	Drew Fustini <dfustini@...storrent.com>,
	Sunil V L <sunilvl@...tanamicro.com>,
	Björn Töpel <bjorn@...osinc.com>
Subject: [PATCH v8 06/17] ACPI: scan: Define weak function to populate dependencies

Some architectures like RISC-V need to add dependencies without explicit
_DEP. Define a weak function which can be implemented by the architecture.

Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
Tested-by: BjÃ¶rn TÃ¶pel <bjorn@...osinc.com>
---
 drivers/acpi/scan.c     | 11 +++++++++++
 include/acpi/acpi_bus.h |  1 +
 2 files changed, 12 insertions(+)

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 39b3ccae9f79..28a221f956d7 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -2077,11 +2077,22 @@ static void acpi_scan_init_hotplug(struct acpi_device *adev)
 	}
 }
 
+u32 __weak arch_acpi_add_auto_dep(acpi_handle handle) { return 0; }
+
 static u32 acpi_scan_check_dep(acpi_handle handle)
 {
 	struct acpi_handle_list dep_devices;
 	u32 count = 0;
 
+	/*
+	 * Some architectures like RISC-V need to add dependencies for
+	 * all devices which use GSI to the interrupt controller so that
+	 * interrupt controller is probed before any of those devices.
+	 * Instead of mandating _DEP on all the devices, detect the
+	 * dependency and add automatically.
+	 */
+	count += arch_acpi_add_auto_dep(handle);
+
 	/*
 	 * Check for _HID here to avoid deferring the enumeration of:
 	 * 1. PCI devices.
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index d6a4dd58e36f..af72a5d9de99 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -994,6 +994,7 @@ static inline void acpi_put_acpi_dev(struct acpi_device *adev)
 int acpi_wait_for_acpi_ipmi(void);
 
 int acpi_scan_add_dep(acpi_handle handle, struct acpi_handle_list *dep_devices);
+u32 arch_acpi_add_auto_dep(acpi_handle handle);
 #else	/* CONFIG_ACPI */
 
 static inline int register_acpi_bus_type(void *bus) { return 0; }
-- 
2.43.0