From 882c982dada4d53079c56de94ccbce1e21cc675f Mon Sep 17 00:00:00 2001
From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Date: Thu, 23 Dec 2021 11:16:17 +0300
Subject: [PATCH] acpi: Store CRC-32 hash of the _PLD in struct acpi_device
Git-commit: 882c982dada4d53079c56de94ccbce1e21cc675f
References: jsc#PED-531
Patch-mainline: v5.17-rc1
Storing CRC-32 hash of the Physical Location of Device
object (_PLD) with devices that have it. The hash is stored
to a new struct acpi_device member "pld_crc".
The hash makes it easier to find devices that share a
location, as there is no need to evaluate the entire object
every time. Knowledge about devices that share a location
can be used in device drivers that need to know the
connections to other components inside a system. USB3 ports
will for example always share their location with a USB2
port.
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20211223081620.45479-3-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
drivers/acpi/scan.c | 16 ++++++++++++++++
include/acpi/acpi_bus.h | 1 +
2 files changed, 17 insertions(+)
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 2c80765670bc..e86e216894c4 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -19,6 +19,7 @@
#include <linux/dma-map-ops.h>
#include <linux/platform_data/x86/apple.h>
#include <linux/pgtable.h>
+#include <linux/crc32.h>
#include "internal.h"
@@ -654,6 +655,19 @@ static int acpi_tie_acpi_dev(struct acpi_device *adev)
return 0;
}
+static void acpi_store_pld_crc(struct acpi_device *adev)
+{
+ struct acpi_pld_info *pld;
+ acpi_status status;
+
+ status = acpi_get_physical_device_location(adev->handle, &pld);
+ if (ACPI_FAILURE(status))
+ return;
+
+ adev->pld_crc = crc32(~0, pld, sizeof(*pld));
+ ACPI_FREE(pld);
+}
+
static int __acpi_device_add(struct acpi_device *device,
void (*release)(struct device *))
{
@@ -712,6 +726,8 @@ static int __acpi_device_add(struct acpi_device *device,
if (device->wakeup.flags.valid)
list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
+ acpi_store_pld_crc(device);
+
mutex_unlock(&acpi_device_lock);
if (device->parent)
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 480f9207a4c6..3a1280649ddf 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -358,6 +358,7 @@ struct acpi_gpio_mapping;
/* Device */
struct acpi_device {
+ u32 pld_crc;
int device_type;
acpi_handle handle; /* no handle for fixed hardware */
struct fwnode_handle fwnode;
--
2.35.3