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acpi: Store CRC-32 hash of the _PLD in struct acpi_device
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>
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2 changed files with 17 additions and 0 deletions
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@ -19,6 +19,7 @@
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#include <linux/dma-map-ops.h>
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#include <linux/platform_data/x86/apple.h>
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#include <linux/pgtable.h>
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#include <linux/crc32.h>
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#include "internal.h"
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@ -654,6 +655,19 @@ static int acpi_tie_acpi_dev(struct acpi_device *adev)
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return 0;
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}
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static void acpi_store_pld_crc(struct acpi_device *adev)
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{
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struct acpi_pld_info *pld;
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acpi_status status;
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status = acpi_get_physical_device_location(adev->handle, &pld);
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if (ACPI_FAILURE(status))
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return;
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adev->pld_crc = crc32(~0, pld, sizeof(*pld));
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ACPI_FREE(pld);
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}
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static int __acpi_device_add(struct acpi_device *device,
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void (*release)(struct device *))
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{
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@ -712,6 +726,8 @@ static int __acpi_device_add(struct acpi_device *device,
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if (device->wakeup.flags.valid)
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list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
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acpi_store_pld_crc(device);
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mutex_unlock(&acpi_device_lock);
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if (device->parent)
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@ -358,6 +358,7 @@ struct acpi_gpio_mapping;
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/* Device */
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struct acpi_device {
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u32 pld_crc;
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int device_type;
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acpi_handle handle; /* no handle for fixed hardware */
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struct fwnode_handle fwnode;
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