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+/*
+ *
+ * (C) COPYRIGHT 2008-2012 ARM Limited. All rights reserved.
+ *
+ * This program is free software and is provided to you under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation, and any use by you of this program is subject to the terms
+ * of such GNU licence.
+ *
+ * A copy of the licence is included with the program, and can also be obtained
+ * from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+
+
+/**
+ * @file
+ *
+ * This file contains the kernel space part of the UMP API.
+ *
+ */
+
+#ifndef _UMP_KERNEL_INTERFACE_H_
+#define _UMP_KERNEL_INTERFACE_H_
+
+/**
+ * @addtogroup ump_api
+ * @{
+ */
+
+/** @defgroup ump_kernel_space_api UMP Kernel Space API
+ * @{ */
+
+/**
+ * External representation of a UMP handle in kernel space.
+ */
+typedef void * ump_dd_handle;
+
+#ifdef CONFIG_KDS
+#include <linux/kds.h>
+#endif
+
+#include <linux/ump-common.h>
+
+#define UMP_KERNEL_API_EXPORT
+
+#if defined(__KERNEL__)
+#include <linux/ump-import.h>
+#else
+#include <ump/src/library/common/ump_user.h>
+#endif
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/**
+ * Value to indicate an invalid UMP memory handle.
+ */
+#define UMP_DD_INVALID_MEMORY_HANDLE ((ump_dd_handle)0)
+
+/**
+ * Struct used to describe a physical block used by UMP memory
+ */
+typedef struct ump_dd_physical_block_64
+{
+ uint64_t addr; /**< The physical address of the block */
+ uint64_t size; /**< The length of the block, in bytes, typically page aligned */
+} ump_dd_physical_block_64;
+
+/**
+ * Security filter hook.
+ *
+ * Each allocation can have a security filter attached to it.@n
+ * The hook receives
+ * @li the secure ID
+ * @li a handle to the allocation
+ * @li the callback_data argument provided to @ref ump_dd_allocate_64 or @ref ump_dd_create_from_phys_blocks_64
+ *
+ * The hook must return @a MALI_TRUE to indicate that access to the handle is allowed or @n
+ * @a MALI_FALSE to state that no access is permitted.@n
+ * This hook is guaranteed to be called in the context of the requesting process/address space.
+ *
+ * The arguments provided to the hook are;
+ * @li the secure ID
+ * @li handle to the allocation
+ * @li the callback_data set when registering the hook
+ *
+ * Return value;
+ * @li @a TRUE to permit access
+ * @li @a FALSE to deny access
+ */
+typedef bool (*ump_dd_security_filter)(ump_secure_id, ump_dd_handle, void *);
+
+/**
+ * Final release notify hook.
+ *
+ * Allocations can have a hook attached to them which is called when the last reference to the allocation is released.
+ * No reference count manipulation is allowed on the provided handle, just property querying (ID get, size get, phys block get).
+ * This is similar to finalizers in OO languages.
+ *
+ * The arguments provided to the hook are;
+ * * handle to the allocation
+ * * the callback_data set when registering the hook
+ */
+typedef void (*ump_dd_final_release_callback)(const ump_dd_handle, void *);
+
+/**
+ * Allocate a buffer.
+ * The lifetime of the allocation is controlled by a reference count.
+ * The reference count of the returned buffer is set to 1.
+ * The memory will be freed once the reference count reaches 0.
+ * Use @ref ump_dd_retain and @ref ump_dd_release to control the reference count.
+ * @param size Number of bytes to allocate. Will be padded up to a multiple of the page size.
+ * @param flags Bit-wise OR of zero or more of the allocation flag bits.
+ * @param[in] filter_func Pointer to a function which will be called when an allocation is required from a
+ * secure id before the allocation itself is returned to user-space.
+ * NULL permitted if no need for a callback.
+ * @param[in] final_release_func Pointer to a function which will be called when the last reference is removed,
+ * just before the allocation is freed. NULL permitted if no need for a callback.
+ * @param[in] callback_data An opaque pointer which will be provided to @a filter_func and @a final_release_func
+ * @return Handle to the new allocation, or @a UMP_DD_INVALID_MEMORY_HANDLE on allocation failure.
+ */
+UMP_KERNEL_API_EXPORT ump_dd_handle ump_dd_allocate_64(uint64_t size, ump_alloc_flags flags, ump_dd_security_filter filter_func, ump_dd_final_release_callback final_release_func, void* callback_data);
+
+
+/**
+ * Allocation bits getter.
+ * Retrieves the allocation flags used when instantiating the given handle.
+ * Just a copy of the flag given to @ref ump_dd_allocate_64 and @ref ump_dd_create_from_phys_blocks_64
+ * @param mem The handle retrieve the bits for
+ * @return The allocation bits used to instantiate the allocation
+ */
+UMP_KERNEL_API_EXPORT ump_alloc_flags ump_dd_allocation_flags_get(const ump_dd_handle mem);
+
+
+/**
+ * Retrieves the secure ID for the specified UMP memory.
+ *
+ * This identifier is unique across the entire system, and uniquely identifies
+ * the specified UMP memory allocation. This identifier can later be used through the
+ * @ref ump_dd_from_secure_id or
+ * @ref ump_from_secure_id
+ * functions in order to access this UMP memory, for instance from another process (if shared of course).
+ * Unless the allocation was marked as shared the returned ID will only be resolvable in the same process as did the allocation.
+ *
+ * Calling on an @a UMP_DD_INVALID_MEMORY_HANDLE will result in undefined behavior.
+ * Debug builds will assert on this.
+ *
+ * @note There is a user space equivalent function called @ref ump_secure_id_get
+ *
+ * @see ump_dd_from_secure_id
+ * @see ump_from_secure_id
+ * @see ump_secure_id_get
+ *
+ * @param mem Handle to UMP memory.
+ *
+ * @return Returns the secure ID for the specified UMP memory.
+ */
+UMP_KERNEL_API_EXPORT ump_secure_id ump_dd_secure_id_get(const ump_dd_handle mem);
+
+#ifdef CONFIG_KDS
+/**
+ * Retrieve the KDS resource for the specified UMP memory.
+ *
+ * The KDS resource should be used to synchronize access to the UMP allocation.
+ * See the KDS API for how to do that.
+ *
+ * @param mem Handle to the UMP memory to query.
+ * @return Pointer to the KDS resource controlling access to the UMP memory.
+ */
+UMP_KERNEL_API_EXPORT struct kds_resource * ump_dd_kds_resource_get(const ump_dd_handle mem);
+#endif
+
+/**
+ * Retrieves a handle to allocated UMP memory.
+ *
+ * The usage of UMP memory is reference counted, so this will increment the reference
+ * count by one for the specified UMP memory.
+ * Use @ref ump_dd_release when there is no longer any
+ * use for the retrieved handle.
+ *
+ * If called on an non-shared allocation and this is a different process @a UMP_DD_INVALID_MEMORY_HANDLE will be returned.
+ *
+ * Calling on an @a UMP_INVALID_SECURE_ID will return @a UMP_DD_INVALID_MEMORY_HANDLE
+ *
+ * @note There is a user space equivalent function called @ref ump_from_secure_id
+ *
+ * @see ump_dd_release
+ * @see ump_from_secure_id
+ *
+ * @param secure_id The secure ID of the UMP memory to open, that can be retrieved using the @ref ump_secure_id_get function.
+ *
+ * @return @a UMP_DD_INVALID_MEMORY_HANDLE indicates failure, otherwise a valid handle is returned.
+ */
+UMP_KERNEL_API_EXPORT ump_dd_handle ump_dd_from_secure_id(ump_secure_id secure_id);
+
+
+/**
+ * Retrieves all physical memory block information for specified UMP memory.
+ *
+ * This function can be used by other device drivers in order to create MMU tables.
+ * This function will return a pointer to an array of @ref ump_dd_physical_block_64 in @a pArray and the number of array elements in @a pCount
+ *
+ * Calling on an @a UMP_DD_INVALID_MEMORY_HANDLE results in undefined behavior.
+ * Debug builds will assert on this.
+ *
+ * @param mem Handle to UMP memory.
+ * @param[out] pCount Pointer to where to store the number of items in the returned array
+ * @param[out] pArray Pointer to where to store a pointer to the physical blocks array
+ */
+UMP_KERNEL_API_EXPORT void ump_dd_phys_blocks_get_64(const ump_dd_handle mem, uint64_t * const pCount, const ump_dd_physical_block_64 ** const pArray);
+
+/**
+ * Retrieves the actual size of the specified UMP memory.
+ *
+ * The size is reported in bytes, and is typically page aligned.
+ *
+ * Calling on an @a UMP_DD_INVALID_MEMORY_HANDLE results in undefined behavior.
+ * Debug builds will assert on this.
+ *
+ * @note There is a user space equivalent function called @ref ump_size_get
+ *
+ * @see ump_size_get
+ *
+ * @param mem Handle to UMP memory.
+ *
+ * @return Returns the allocated size of the specified UMP memory, in bytes.
+ */
+UMP_KERNEL_API_EXPORT uint64_t ump_dd_size_get_64(const ump_dd_handle mem);
+
+
+/**
+ * Adds an extra reference to the specified UMP memory allocation.
+ *
+ * The function @ref ump_dd_release must then be used
+ * to release each copy of the UMP memory handle.
+ *
+ * Calling on an @a UMP_DD_INVALID_MEMORY_HANDLE results in undefined behavior.
+ * Debug builds will assert on this.
+ *
+ * @note You are not required to call @ref ump_dd_retain
+ * for UMP handles returned from
+ * @ref ump_dd_from_secure_id,
+ * because these handles are already reference counted by this function.
+ *
+ * @note There is a user space equivalent function called @ref ump_retain
+ *
+ * @see ump_retain
+ *
+ * @param mem Handle to UMP memory.
+ * @return 0 indicates success, any other value indicates failure.
+ */
+UMP_KERNEL_API_EXPORT int ump_dd_retain(ump_dd_handle mem);
+
+
+/**
+ * Releases a reference from the specified UMP memory.
+ *
+ * This function must be called once for every reference to the UMP memory handle.
+ * When the last reference is released, all resources associated with this UMP memory
+ * handle are freed.
+ *
+ * One can only call ump_release when matched with a successful ump_dd_retain, ump_dd_allocate_64 or ump_dd_from_secure_id
+ * If called on an @a UMP_DD_INVALID_MEMORY_HANDLE the function will early out.
+ *
+ * @note There is a user space equivalent function called @ref ump_release
+ *
+ * @see ump_release
+ *
+ * @param mem Handle to UMP memory.
+ */
+UMP_KERNEL_API_EXPORT void ump_dd_release(ump_dd_handle mem);
+
+/**
+ * Create an ump allocation handle based on externally managed memory.
+ * Used to wrap an existing allocation as an UMP memory handle.
+ * Once wrapped the memory acts just like a normal allocation coming from @ref ump_dd_allocate_64.
+ * The only exception is that the freed physical memory is not put into the pool of free memory, but instead considered returned to the caller once @a final_release_func returns.
+ * The blocks array will be copied, so no need to hold on to it after this function returns.
+ * @param[in] blocks Array of @ref ump_dd_physical_block_64
+ * @param num_blocks Number of elements in the array pointed to by @a blocks
+ * @param flags Allocation flags to mark the handle with
+ * @param[in] filter_func Pointer to a function which will be called when an allocation is required from a secure id before the allocation itself is returned to user-space.
+ * NULL permitted if no need for a callback.
+ * @param[in] final_release_func Pointer to a function which will be called when the last reference is removed, just before the allocation is freed. NULL permitted if no need for a callback.
+ * @param[in] callback_data An opaque pointer which will be provided to @a filter_func and @a final_release_func
+ * @return Handle to the UMP allocation handle created, or @a UMP_DD_INVALID_MEMORY_HANDLE if no such handle could be created.
+ */
+UMP_KERNEL_API_EXPORT ump_dd_handle ump_dd_create_from_phys_blocks_64(const ump_dd_physical_block_64 * blocks, uint64_t num_blocks, ump_alloc_flags flags, ump_dd_security_filter filter_func, ump_dd_final_release_callback final_release_func, void* callback_data);
+
+
+/** @name UMP v1 API
+ * Functions provided to support compatibility with UMP v1 API
+ *
+ *@{
+ */
+
+/**
+ * Value to indicate an invalid UMP memory handle.
+ */
+#define UMP_DD_HANDLE_INVALID UMP_DD_INVALID_MEMORY_HANDLE
+
+/**
+ * UMP error codes for kernel space.
+ */
+typedef enum
+{
+ UMP_DD_SUCCESS, /**< indicates success */
+ UMP_DD_INVALID /**< indicates failure */
+} ump_dd_status_code;
+
+
+/**
+ * Struct used to describe a physical block used by UMP memory
+ */
+typedef struct ump_dd_physical_block
+{
+ unsigned long addr; /**< The physical address of the block */
+ unsigned long size; /**< The length of the block, typically page aligned */
+} ump_dd_physical_block;
+
+
+/**
+ * Retrieves a handle to allocated UMP memory.
+ *
+ * The usage of UMP memory is reference counted, so this will increment the reference
+ * count by one for the specified UMP memory.
+ * Use @ref ump_dd_reference_release "ump_dd_reference_release" when there is no longer any
+ * use for the retrieved handle.
+ *
+ * @note There is a user space equivalent function called @ref ump_handle_create_from_secure_id "ump_handle_create_from_secure_id"
+ *
+ * @see ump_dd_reference_release
+ * @see ump_handle_create_from_secure_id
+ *
+ * @param secure_id The secure ID of the UMP memory to open, that can be retrieved using the @ref ump_secure_id_get "ump_secure_id_get " function.
+ *
+ * @return UMP_INVALID_MEMORY_HANDLE indicates failure, otherwise a valid handle is returned.
+ */
+UMP_KERNEL_API_EXPORT ump_dd_handle ump_dd_handle_create_from_secure_id(ump_secure_id secure_id);
+
+
+
+/**
+ * Create an ump allocation handle based on externally managed memory.
+ * Used to wrap an existing allocation as an UMP memory handle.
+ *
+ * @param[in] blocks Array of @ref ump_dd_physical_block
+ * @param num_blocks Number of elements in the array pointed to by @a blocks
+ *
+ * @return Handle to the UMP allocation handle created, or @a UMP_DD_INVALID_MEMORY_HANDLE if no such handle could be created.
+ */
+UMP_KERNEL_API_EXPORT ump_dd_handle ump_dd_handle_create_from_phys_blocks(ump_dd_physical_block * blocks, unsigned long num_blocks);
+
+
+/**
+ * Retrieves the number of physical blocks used by the specified UMP memory.
+ *
+ * This function retrieves the number of @ref ump_dd_physical_block "ump_dd_physical_block" structs needed
+ * to describe the physical memory layout of the given UMP memory. This can later be used when calling
+ * the functions @ref ump_dd_phys_blocks_get "ump_dd_phys_blocks_get" and
+ * @ref ump_dd_phys_block_get "ump_dd_phys_block_get".
+ *
+ * @see ump_dd_phys_blocks_get
+ * @see ump_dd_phys_block_get
+ *
+ * @param mem Handle to UMP memory.
+ *
+ * @return The number of ump_dd_physical_block structs required to describe the physical memory layout of the specified UMP memory.
+ */
+UMP_KERNEL_API_EXPORT unsigned long ump_dd_phys_block_count_get(ump_dd_handle mem);
+
+
+/**
+ * Retrieves all physical memory block information for specified UMP memory.
+ *
+ * This function can be used by other device drivers in order to create MMU tables.
+ *
+ * @note This function will fail if the num_blocks parameter is either to large or to small.
+ *
+ * @see ump_dd_phys_block_get
+ *
+ * @param mem Handle to UMP memory.
+ * @param blocks An array of @ref ump_dd_physical_block "ump_dd_physical_block" structs that will receive the physical description.
+ * @param num_blocks The number of blocks to return in the blocks array. Use the function
+ * @ref ump_dd_phys_block_count_get "ump_dd_phys_block_count_get" first to determine the number of blocks required.
+ *
+ * @return UMP_DD_SUCCESS indicates success, UMP_DD_INVALID indicates failure.
+ */
+UMP_KERNEL_API_EXPORT ump_dd_status_code ump_dd_phys_blocks_get(ump_dd_handle mem, ump_dd_physical_block * const blocks, unsigned long num_blocks);
+
+
+/**
+ * Retrieves the physical memory block information for specified block for the specified UMP memory.
+ *
+ * This function can be used by other device drivers in order to create MMU tables.
+ *
+ * @note This function will return UMP_DD_INVALID if the specified index is out of range.
+ *
+ * @see ump_dd_phys_blocks_get
+ *
+ * @param mem Handle to UMP memory.
+ * @param index Which physical info block to retrieve.
+ * @param block Pointer to a @ref ump_dd_physical_block "ump_dd_physical_block" struct which will receive the requested information.
+ *
+ * @return UMP_DD_SUCCESS indicates success, UMP_DD_INVALID indicates failure.
+ */
+UMP_KERNEL_API_EXPORT ump_dd_status_code ump_dd_phys_block_get(ump_dd_handle mem, unsigned long index, ump_dd_physical_block * const block);
+
+
+/**
+ * Retrieves the actual size of the specified UMP memory.
+ *
+ * The size is reported in bytes, and is typically page aligned.
+ *
+ * @note There is a user space equivalent function called @ref ump_size_get "ump_size_get"
+ *
+ * @see ump_size_get
+ *
+ * @param mem Handle to UMP memory.
+ *
+ * @return Returns the allocated size of the specified UMP memory, in bytes.
+ */
+UMP_KERNEL_API_EXPORT unsigned long ump_dd_size_get(ump_dd_handle mem);
+
+
+/**
+ * Adds an extra reference to the specified UMP memory.
+ *
+ * This function adds an extra reference to the specified UMP memory. This function should
+ * be used every time a UMP memory handle is duplicated, that is, assigned to another ump_dd_handle
+ * variable. The function @ref ump_dd_reference_release "ump_dd_reference_release" must then be used
+ * to release each copy of the UMP memory handle.
+ *
+ * @note You are not required to call @ref ump_dd_reference_add "ump_dd_reference_add"
+ * for UMP handles returned from
+ * @ref ump_dd_handle_create_from_secure_id "ump_dd_handle_create_from_secure_id",
+ * because these handles are already reference counted by this function.
+ *
+ * @note There is a user space equivalent function called @ref ump_reference_add "ump_reference_add"
+ *
+ * @see ump_reference_add
+ *
+ * @param mem Handle to UMP memory.
+ */
+UMP_KERNEL_API_EXPORT void ump_dd_reference_add(ump_dd_handle mem);
+
+
+/**
+ * Releases a reference from the specified UMP memory.
+ *
+ * This function should be called once for every reference to the UMP memory handle.
+ * When the last reference is released, all resources associated with this UMP memory
+ * handle are freed.
+ *
+ * @note There is a user space equivalent function called @ref ump_reference_release "ump_reference_release"
+ *
+ * @see ump_reference_release
+ *
+ * @param mem Handle to UMP memory.
+ */
+UMP_KERNEL_API_EXPORT void ump_dd_reference_release(ump_dd_handle mem);
+
+/* @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+
+/** @} */ /* end group ump_kernel_space_api */
+
+/** @} */ /* end group ump_api */
+
+#endif /* _UMP_KERNEL_INTERFACE_H_ */