linux-kernel - [RFC PATCH v4 08/20] ACPI: scan: Refactor dependency creation

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Message-Id: <20240415170113.662318-9-sunilvl@ventanamicro.com>
Date: Mon, 15 Apr 2024 22:31:01 +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>,
	Haibo1 Xu <haibo1.xu@...el.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	Atish Kumar Patra <atishp@...osinc.com>,
	Andrei Warkentin <andrei.warkentin@...el.com>,
	Marc Zyngier <maz@...nel.org>,
	Björn Töpel <bjorn@...nel.org>,
	Sunil V L <sunilvl@...tanamicro.com>
Subject: [RFC PATCH v4 08/20] ACPI: scan: Refactor dependency creation

Some architectures like RISC-V will use implicit dependencies like GSI
map to create dependencies between interrupt controller and devices. To
support doing that, the function which creates the dependency, is
refactored bit and made public so that dependency can be added from
outside of scan.c as well.

Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
---
 drivers/acpi/scan.c     | 48 ++++++++++++++++++++++++-----------------
 include/acpi/acpi_bus.h |  1 +
 2 files changed, 29 insertions(+), 20 deletions(-)

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index de30a0af7a2f..c8f40d81b6cb 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -2028,33 +2028,18 @@ static void acpi_scan_init_hotplug(struct acpi_device *adev)
 	}
 }
 
-static u32 acpi_scan_check_dep(acpi_handle handle)
+int acpi_scan_add_dep(acpi_handle handle, struct acpi_handle_list *dep_devices)
 {
-	struct acpi_handle_list dep_devices;
 	u32 count;
 	int i;
 
-	/*
-	 * Check for _HID here to avoid deferring the enumeration of:
-	 * 1. PCI devices.
-	 * 2. ACPI nodes describing USB ports.
-	 * Still, checking for _HID catches more then just these cases ...
-	 */
-	if (!acpi_has_method(handle, "_DEP") || !acpi_has_method(handle, "_HID"))
-		return 0;
-
-	if (!acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices)) {
-		acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
-		return 0;
-	}
-
-	for (count = 0, i = 0; i < dep_devices.count; i++) {
+	for (count = 0, i = 0; i < dep_devices->count; i++) {
 		struct acpi_device_info *info;
 		struct acpi_dep_data *dep;
 		bool skip, honor_dep;
 		acpi_status status;
 
-		status = acpi_get_object_info(dep_devices.handles[i], &info);
+		status = acpi_get_object_info(dep_devices->handles[i], &info);
 		if (ACPI_FAILURE(status)) {
 			acpi_handle_debug(handle, "Error reading _DEP device info\n");
 			continue;
@@ -2073,7 +2058,7 @@ static u32 acpi_scan_check_dep(acpi_handle handle)
 
 		count++;
 
-		dep->supplier = dep_devices.handles[i];
+		dep->supplier = dep_devices->handles[i];
 		dep->consumer = handle;
 		dep->honor_dep = honor_dep;
 
@@ -2082,7 +2067,30 @@ static u32 acpi_scan_check_dep(acpi_handle handle)
 		mutex_unlock(&acpi_dep_list_lock);
 	}
 
-	acpi_handle_list_free(&dep_devices);
+	acpi_handle_list_free(dep_devices);
+	return count;
+}
+
+static u32 acpi_scan_check_dep(acpi_handle handle)
+{
+	struct acpi_handle_list dep_devices;
+	u32 count = 0;
+
+	/*
+	 * Check for _HID here to avoid deferring the enumeration of:
+	 * 1. PCI devices.
+	 * 2. ACPI nodes describing USB ports.
+	 * Still, checking for _HID catches more then just these cases ...
+	 */
+	if (!acpi_has_method(handle, "_DEP") || !acpi_has_method(handle, "_HID"))
+		return count;
+
+	if (!acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices)) {
+		acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
+		return count;
+	}
+
+	count += acpi_scan_add_dep(handle, &dep_devices);
 	return count;
 }
 
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 1a4dfd7a1c4a..28a9b87c23fa 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -993,6 +993,7 @@ 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);
 #else	/* CONFIG_ACPI */
 
 static inline int register_acpi_bus_type(void *bus) { return 0; }
-- 
2.40.1