acpi: Be more ACPI compliant when generating _UID
* Add function to generate unique _UID using CRC32 * Add function to write the _UID based on a device's ACPI path ACPI devices that have the same _HID must use different _UID. Linux doesn't care about _UID if it's not used. Windows 10 verifies the ACPI code on boot and BSODs if two devices with the same _HID share the same _UID. Fixes BSOD seen on Windows 10. Change-Id: I47cd5396060d325f9ce338afced6af021e7ff2b4 Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/37695 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
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@ -2,6 +2,8 @@
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This section contains documentation about coreboot on ACPI.
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- [SSDT UID generation](uid.md)
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## GPIO
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- [GPIO toggling in ACPI AML](gpio.md)
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@ -0,0 +1,14 @@
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# ACPI SSDT \_UID generation
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According to the ACPI spec:
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> The _UID must be unique across all devices with either a common _HID or _CID.
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When generating SSDTs in coreboot the independent drivers don't know
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which \_UID is already in use for a specific \_HID or \_CID. To generate
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unique \_UIDs the ACPI device's path is hashed and used as ID. As every ACPI
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device has a different path, the hash will be also different for every device.
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Windows 10 verifies all devices with the same \_HID or \_CID and makes
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sure that no \_UID is duplicated. If it is it'll BSOD.
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@ -18,6 +18,8 @@
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#include <device/device.h>
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#include <device/path.h>
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#include <stdlib.h>
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#include <crc_byte.h>
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#if CONFIG(GENERIC_GPIO_LIB)
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#include <gpio.h>
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#endif
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@ -98,6 +100,19 @@ const char *acpi_device_hid(const struct device *dev)
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return NULL;
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}
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/*
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* Generate unique ID based on the ACPI path.
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* Collisions on the same _HID are possible but very unlikely.
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*/
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uint32_t acpi_device_uid(struct device *dev)
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{
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const char *path = acpi_device_path(dev);
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if (!path)
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return 0;
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return CRC(path, strlen(path), crc32_byte);
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}
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/* Recursive function to find the root device and print a path from there */
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static ssize_t acpi_device_path_fill(const struct device *dev, char *buf,
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size_t buf_len, size_t cur)
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@ -192,6 +207,13 @@ int acpi_device_status(const struct device *dev)
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return ACPI_STATUS_DEVICE_ALL_ON;
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}
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/* Write the unique _UID based on ACPI device path. */
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void acpi_device_write_uid(struct device *dev)
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{
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acpigen_write_name_integer("_UID", acpi_device_uid(dev));
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}
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/* ACPI 6.1 section 6.4.3.6: Extended Interrupt Descriptor */
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void acpi_device_write_interrupt(const struct acpi_irq *irq)
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{
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@ -62,10 +62,12 @@ struct acpi_dp {
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struct device;
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const char *acpi_device_name(const struct device *dev);
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const char *acpi_device_hid(const struct device *dev);
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uint32_t acpi_device_uid(struct device *dev);
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const char *acpi_device_path(const struct device *dev);
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const char *acpi_device_scope(const struct device *dev);
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const char *acpi_device_path_join(const struct device *dev, const char *name);
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int acpi_device_status(const struct device *dev);
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void acpi_device_write_uid(struct device *dev);
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/*
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* ACPI Descriptor for extended Interrupt()
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@ -117,7 +117,7 @@ static void crb_tpm_fill_ssdt(struct device *dev)
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acpigen_write_name_string("_HID", "MSFT0101");
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acpigen_write_name_string("_CID", "MSFT0101");
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acpigen_write_name_integer("_UID", 1);
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acpi_device_write_uid(dev);
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acpigen_write_STA(ACPI_STATUS_DEVICE_ALL_ON);
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@ -312,7 +312,8 @@ static void r8168_net_fill_ssdt(struct device *dev)
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acpigen_write_scope(path);
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acpigen_write_device(acpi_device_name(dev));
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acpigen_write_name_string("_HID", R8168_ACPI_HID);
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acpigen_write_name_integer("_UID", 0);
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acpi_device_write_uid(dev);
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if (dev->chip_ops)
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acpigen_write_name_string("_DDN", dev->chip_ops->name);
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@ -902,7 +902,7 @@ static void lpc_tpm_fill_ssdt(struct device *dev)
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acpigen_write_name("_CID");
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acpigen_emit_eisaid("PNP0C31");
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acpigen_write_name_integer("_UID", 1);
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acpi_device_write_uid(dev);
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u32 did_vid = tpm_read_did_vid(0);
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if (did_vid > 0 && did_vid < 0xffffffff)
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@ -187,7 +187,8 @@ void generic_wifi_fill_ssdt(struct device *dev,
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/* Device */
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acpigen_write_scope(path);
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acpigen_write_device(acpi_device_name(dev));
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acpigen_write_name_integer("_UID", 0);
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acpi_device_write_uid(dev);
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if (dev->chip_ops)
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acpigen_write_name_string("_DDN", dev->chip_ops->name);
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@ -196,7 +196,8 @@ void superio_common_fill_ssdt_generator(struct device *dev)
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/* Device */
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acpigen_write_device(name);
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acpigen_write_name_byte("_UID", 0);
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acpi_device_write_uid(dev);
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acpigen_write_name_byte("LDN", ldn);
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acpigen_write_name_byte("VLDN", vldn);
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