557b17076f
Such interrupt remapping controller may be found along with Intel VT-D hardware. Its base-address is via ACPI, and it enables up to 64K interrupt indexes. Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
81 lines
2.0 KiB
C
81 lines
2.0 KiB
C
/*
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* Copyright (c) 2020 Intel Corporation
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_INCLUDE_DRIVERS_INTEL_VTD_H_
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#define ZEPHYR_INCLUDE_DRIVERS_INTEL_VTD_H_
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#include <drivers/pcie/msi.h>
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typedef int (*vtd_alloc_entries_f)(const struct device *dev,
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uint8_t n_entries);
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typedef uint32_t (*vtd_remap_msi_f)(const struct device *dev,
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msi_vector_t *vector);
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typedef int (*vtd_remap_f)(const struct device *dev,
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msi_vector_t *vector);
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struct vtd_driver_api {
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vtd_alloc_entries_f allocate_entries;
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vtd_remap_msi_f remap_msi;
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vtd_remap_f remap;
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};
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/**
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* @brief Allocate contiguous IRTEs
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*
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* @param dev Pointer to the device structure for the driver instance
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* @param n_entries How many IRTE to allocate
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*
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* Note: It will try to allocate all, or it will fail.
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*
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* @return The first allocated IRTE index, or -EBUSY on failure
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*/
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static inline int vtd_allocate_entries(const struct device *dev,
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uint8_t n_entries)
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{
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const struct vtd_driver_api *api =
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(const struct vtd_driver_api *)dev->api;
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return api->allocate_entries(dev, n_entries);
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}
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/**
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* @brief Generate the MSI Message Address data for the given vector
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*
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* @param dev Pointer to the device structure for the driver instance
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* @param vector A valid allocated MSI vector
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*
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* @return The MSI Message Address value
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*/
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static inline uint32_t vtd_remap_msi(const struct device *dev,
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msi_vector_t *vector)
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{
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const struct vtd_driver_api *api =
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(const struct vtd_driver_api *)dev->api;
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return api->remap_msi(dev, vector);
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}
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/**
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* @brief Remap the given vector
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*
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* @param dev Pointer to the device structure for the driver instance
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* @param vector A valid allocated MSI vector
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*
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* @return 0 on success, a negative errno otherwise
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*/
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static inline int vtd_remap(const struct device *dev,
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msi_vector_t *vector)
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{
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const struct vtd_driver_api *api =
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(const struct vtd_driver_api *)dev->api;
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return api->remap(dev, vector);
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}
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#endif /* ZEPHYR_INCLUDE_DRIVERS_INTEL_VTD_H_ */
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