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// Copyright(c) 2017-2018, Intel Corporation
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of Intel Corporation nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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/**
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* @file opae/sysobject.h
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* @brief Functions to read/write from system objects.
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* On Linux systems with the OPAE kernel driver, this is used to access sysfs
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* nodes created by the driver.
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*/
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#ifndef __FPGA_SYSOBJECT_H__
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#define __FPGA_SYSOBJECT_H__
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#include <opae/types.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Create an `fpga_object` data structures. An `fpga_object`
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* is a handle to an FPGA resource which can be an attribute, register or
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* a container. This object is read-only.
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*
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* @param[in] token Token identifying a resource (accelerator or device)
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* @param[in] name A key identifying an object belonging to a resource.
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* @param[out] object Pointer to memory to store the object in
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* @param[in] flags Control behavior of object identification and creation.
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* FPGA_OBJECT_GLOB is used to indicate that the name should be treated as a
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* globbing expression. FPGA_OBJECT_RECURSE_ONE indicates that subobjects be
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* created for objects one level down from the object identified by name.
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* FPGA_OBJECT_RECURSE_ALL indicates that subobjects be created for all objects
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* below the current object identified by name.
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*
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* @return FPGA_OK on success. FPGA_INVALID_PARAM if any of the supplied
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* parameters is invalid. FPGA_NOT_FOUND if an object cannot be found with the
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* given key. FPGA_NOT_SUPPORTED if this function is not supported by the
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* current implementation of this API.
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*
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* @note Names that begin with '.' or '/' or contain '..' are not allowed and
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* result in FPGA_INVALID_PARAM being returned
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*
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*/
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fpga_result fpgaTokenGetObject(fpga_token token, const char *name,
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fpga_object *object, int flags);
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/**
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* @brief Create an `fpga_object` data structure from a handle.
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* An `fpga_object` is a handle to an FPGA resource which can be an attribute,
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* register, or container. This object has read/write access..
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*
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* @param[in] handle Handle identifying a resource (accelerator or device)
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* @param[in] name A key identifying an object belonging to a resource.
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* @param[out] object Pointer to memory to store the object in
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* @param[in] flags Control behavior of object identification and creation
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* FPGA_OBJECT_GLOB is used to indicate that the name should be treated as a
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* globbing expression. FPGA_OBJECT_RECURSE_ONE indicates that subobjects be
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* created for objects one level down from the object identified by name.
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* FPGA_OBJECT_RECURSE_ALL indicates that subobjects be created for all objects
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* below the current object identified by name.
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*
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* @return FPGA_OK on success. FPGA_INVALID_PARAM if any of the supplied
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* parameters is invalid. FPGA_NOT_FOUND if an object cannot be found with the
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* given key. FPGA_NOT_SUPPORTED if this function is not supported by the
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* current implementation of this API.
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*
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* @note Names that begin with '.' or '/' or contain '..' are not allowed and
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* result in FPGA_INVALID_PARAM being returned
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*
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*/
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fpga_result fpgaHandleGetObject(fpga_handle handle, const char *name,
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fpga_object *object, int flags);
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/**
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* @brief Create an `fpga_object` data structure from a parent object. An
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* `fpga_object` is a handle to an FPGA resource which can be an attribute,
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* register, or container. If the parent object was created with a handle,
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* then the new object will inherit the handle allowing it to have read-write
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* access to the object data.
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*
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* @param[in] parent A parent container `fpga_object`.
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* @param[in] name A key identifying a sub-object of the parent container.
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* @param[out] object Pointer to memory to store the object in.
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* @param[in] flags Control behavior of object identification and creation.
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* FPGA_OBJECT_GLOB is used to indicate that the name should be treated as a
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* globbing expression. FPGA_OBJECT_RECURSE_ONE indicates that subobjects be
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* created for objects one level down from the object identified by name.
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* FPGA_OBJECT_RECURSE_ALL indicates that subobjects be created for all objects
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* below the current object identified by name.
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*
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* @return FPGA_OK on success. FPGA_INVALID_PARAM if any of the supplied
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* parameters is invalid - this includes a parent object that is not a
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* container object. FPGA_NOT_FOUND if an object cannot be found with the given
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* key. FPGA_NOT_SUPPORTED if this function is not supported by the current
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* implementation of this API.
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*
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* @note Names that begin with '.' or '/' or contain '..' are not allowed and
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* result in FPGA_INVALID_PARAM being returned
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*
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*/
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fpga_result fpgaObjectGetObject(fpga_object parent, const char *name,
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fpga_object *object, int flags);
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/**
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* @brief Create an `fpga_object` data structure from a parent object using a
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* given index. An `fpga_object` is a handle to an FPGA resource which can be
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* an attribute, register, or container. If the parent object was created with
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* a handle, then the new object will inherit the handle allowing it to have
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* read-write access to the object data.
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*
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* @param[in] parent A parent container 'fpga_object'
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* @param[in] idx A positive index less than the size reported by the parent.
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* @param[out] object Pointer to memory to store the object in.
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*
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* @return FPGA_OK on success. FPGA_INVALID_PARAM if any of the supplied
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* parameters is invalid - this includes a parent object that is not a
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* container object. FPGA_NOT_FOUND if an object cannot be found with the given
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* key. FPGA_NOT_SUPPORTED if this function is not supported by the current
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* implementation of this API.
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*/
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fpga_result fpgaObjectGetObjectAt(fpga_object parent, size_t idx,
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fpga_object *object);
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/**
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* @brief Get the sysobject type (container or attribute)
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*
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* @param[in] obj An fpga_object instance
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* @param[out] type The type of object (FPGA_OBJECT_CONTAINER or
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* FPGA_OBJECT_ATTRIBUTE)
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*
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* @return FPGA_OK on success, FPGA_INVALID_PARAM if any of the supplied
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* parameters are null or invalid
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*/
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fpga_result fpgaObjectGetType(fpga_object obj, enum fpga_sysobject_type *type);
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/**
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* @brief Free memory used for the fpga_object data structure
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*
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* @note fpgaDestroyObject() requires the address of an fpga_object
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* as created by fpgaTokenGetObject(), fpgaHandleGetObject(),
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* or fpgaObjectGetObject(). Passing any other value results in
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* undefind behavior.
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*
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* @param obj Pointer to the fpga_object instance to destroy
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*
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* @return FPGA_OK on success, FPGA_INVALID_PARAM if the object is NULL,
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* FPGA_EXCEPTION if an internal error is encountered.
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*/
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fpga_result fpgaDestroyObject(fpga_object *obj);
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/**
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* @brief Retrieve the size of the object.
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*
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* @param[in] obj An fpga_object instance.
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* @param[out] value Pointer to variable to store size in.
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* @param[in] flags Flags that control how the object is read
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* If FPGA_OBJECT_SYNC is used then object will update its buffered copy before
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* retrieving the size.
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*
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* @return FPGA_OK on success. FPGA_INVALID_PARAM if any of supplied parameters
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* is invalid. FPGA_EXCEPTION if error occurred.
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*/
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fpga_result fpgaObjectGetSize(fpga_object obj, uint32_t *value, int flags);
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/**
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* @brief Read bytes from an FPGA object
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*
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* @param[in] obj An fpga_object instance.
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* @param[out] buffer Pointer to a buffer to read bytes into.
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* @param[in] offset Byte offset relative to objects internal buffer where to
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* begin reading bytes from.
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* @param[in] len The length, in bytes, to read from the object.
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* @param[in] flags Flags that control how object is read
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* If FPGA_OBJECT_SYNC is used then object will update its buffered copy before
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* retrieving the data.
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*
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* @return FPGA_OK on success, FPGA_INVALID_PARAM if any of the supplied
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* parameters is invalid
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*/
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fpga_result fpgaObjectRead(fpga_object obj, uint8_t *buffer, size_t offset,
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size_t len, int flags);
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/**
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* @brief Read a 64-bit value from an FPGA object.
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* The value is assumed to be in string format and will be parsed. See flags
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* below for changing that behavior.
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*
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* @param[in] obj An fpga_object instance
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* @param[out] value Pointer to a 64-bit variable to store the value in
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* @param[in] flags Flags that control how the object is read
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* If FPGA_OBJECT_SYNC is used then object will update its buffered copy before
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* retrieving the data. If FPGA_OBJECT_RAW is used, then the data will be read
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* as raw bytes into the uint64_t pointer variable.
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*
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* @return FPGA_OK on success, FPGA_INVALID_PARAM if any of the supplied
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* parameters is invalid
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*/
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fpga_result fpgaObjectRead64(fpga_object obj, uint64_t *value, int flags);
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/**
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* @brief Write 64-bit value to an FPGA object.
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* The value will be converted to string before writing. See flags below for
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* changing that behavior.
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*
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* @param[in] obj An fpga_object instance.
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* @param[in] value The value to write to the object
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* @param[in] flags Flags that control how the object is written
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* If FPGA_OBJECT_RAW is used, then the value will be written as raw bytes.
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*
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* @return FPGA_OK on success, FPGA_INVALID_PARAM if any of the supplied
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* parameters is invalid
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*
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* @note The object must have been created using a handle to a resource.
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*/
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fpga_result fpgaObjectWrite64(fpga_object obj, uint64_t value, int flags);
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#ifdef __cplusplus
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} // extern "C"
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#endif // __cplusplus
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#endif /* !__FPGA_SYSOBJECT_H__ */
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