Device configuration structures are plenty so declare a struct for each known variant. As neither of them shall be accessed without verifying the memory block first, introduce macros to make it easy to do so. Link: https://github.com/acpica/acpica/pull/881 Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx> Signed-off-by: Cezary Rojewski <cezary.rojewski@xxxxxxxxx> --- include/acpi/actbl2.h | 28 ++++++++++++++++++ include/acpi/nhlt.h | 66 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 94 insertions(+) create mode 100644 include/acpi/nhlt.h diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h index 0029336775a9..c4c9a3a89ba6 100644 --- a/include/acpi/actbl2.h +++ b/include/acpi/actbl2.h @@ -2014,6 +2014,25 @@ struct acpi_nhlt_vendor_mic_count { u8 microphone_count; }; +/* The only guaranteed configuration space header. Any other requires validation. */ +struct acpi_nhlt_cfg { + u32 capabilities_size; + u8 capabilities[]; +}; + +struct acpi_nhlt_devcfg { + u32 capabilities_size; + u8 virtual_slot; + u8 config_type; +}; + +struct acpi_nhlt_mic_devcfg { + u32 capabilities_size; + u8 virtual_slot; + u8 config_type; + u8 array_type; +}; + struct acpi_nhlt_vendor_mic_config { u8 type; u8 panel; @@ -2030,6 +2049,15 @@ struct acpi_nhlt_vendor_mic_config { u16 work_horizontal_angle_end; /* -180 - + 180 with 2 deg step */ }; +struct acpi_nhlt_vendor_mic_devcfg { + u32 capabilities_size; + u8 virtual_slot; + u8 config_type; + u8 array_type; + u8 num_mics; + struct acpi_nhlt_vendor_mic_config mics[]; +}; + /* Values for Type field above */ #define ACPI_NHLT_MIC_OMNIDIRECTIONAL 0 diff --git a/include/acpi/nhlt.h b/include/acpi/nhlt.h new file mode 100644 index 000000000000..af3ec45ba4f9 --- /dev/null +++ b/include/acpi/nhlt.h @@ -0,0 +1,66 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright(c) 2023 Intel Corporation. All rights reserved. + * + * Authors: Cezary Rojewski <cezary.rojewski@xxxxxxxxx> + * Amadeusz Slawinski <amadeuszx.slawinski@xxxxxxxxxxxxxxx> + */ + +#ifndef __ACPI_NHLT_H__ +#define __ACPI_NHLT_H__ + +#include <linux/acpi.h> +#include <linux/overflow.h> +#include <linux/types.h> + +#define __acpi_nhlt_endpoint_cfg(ep) ((void *)((ep) + 1)) + +/* + * As device configuration spaces present in NHLT tables around the world are + * not following single pattern, first check if 'capabilities_size' is correct + * in respect to size of the specified space type before returning the pointer. + */ +#define __acpi_nhlt_endpoint_devcfg(ep, type) ({ \ + struct acpi_nhlt_cfg *__cfg = __acpi_nhlt_endpoint_cfg(ep); \ + __cfg->capabilities_size >= sizeof(type) ? \ + ((type *)__cfg) : NULL; }) + +/* + * acpi_nhlt_endpoint_devcfg - Test and access device configuration. + * @ep: endpoint for which to retrieve device configuration. + * + * Return: A pointer to device configuration space or NULL if the space's + * 'capabilities_size' is insufficient to cover the nested structure. + */ +#define acpi_nhlt_endpoint_devcfg(ep) \ + __acpi_nhlt_endpoint_devcfg(ep, struct acpi_nhlt_devcfg) + +/* + * acpi_nhlt_endpoint_mic_devcfg - Test and access device configuration. + * @ep: endpoint for which to retrieve device configuration. + * + * Return: A pointer to device configuration space or NULL if the space's + * 'capabilities_size' is insufficient to cover the nested structure. + */ +#define acpi_nhlt_endpoint_mic_devcfg(ep) \ + __acpi_nhlt_endpoint_devcfg(ep, struct acpi_nhlt_mic_devcfg) + +/* + * acpi_nhlt_endpoint_vendor_mic_devcfg - Test and access device configuration. + * @ep: endpoint for which to retrieve device configuration. + * @ptr: pointer to a device configuration structure. + * + * This is the same as acpi_nhlt_endpoint_devcfg(), except that it verifies + * if size of the flexible array following the structure header is also + * reflected in 'capabilities_size'. + * + * Return: A pointer to device configuration space or NULL if the space's + * 'capabilities_size' is insufficient to cover the nested structure. + */ +#define acpi_nhlt_endpoint_vendor_mic_devcfg(ep) ({ \ + struct acpi_nhlt_vendor_mic_devcfg *__cfg = __acpi_nhlt_endpoint_cfg(ep); \ + __cfg->capabilities_size >= sizeof(*__cfg) && \ + __cfg->capabilities_size == struct_size(__cfg, mics, __cfg->num_mics) ? \ + __cfg : NULL; }) + +#endif /* __ACPI_NHLT_H__ */ -- 2.25.1
