drivers/gpu/drm/amd/amdgpu/amdgpu_psp_ta.c - linux - Git at Google

 /*
  * Copyright 2022 Advanced Micro Devices, Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  * OTHER DEALINGS IN THE SOFTWARE.
  *
  */

 #include "amdgpu.h"
 #include "amdgpu_psp_ta.h"

 #if defined(CONFIG_DEBUG_FS)

 static ssize_t ta_if_load_debugfs_write(struct file *fp, const char *buf,
 					    size_t len, loff_t *off);
 static ssize_t ta_if_unload_debugfs_write(struct file *fp, const char *buf,
 					    size_t len, loff_t *off);
 static ssize_t ta_if_invoke_debugfs_write(struct file *fp, const char *buf,
 					    size_t len, loff_t *off);

 static uint32_t get_bin_version(const uint8_t *bin)
 {
 	const struct common_firmware_header *hdr =
 			     (const struct common_firmware_header *)bin;

 	return hdr->ucode_version;
 }

 static int prep_ta_mem_context(struct ta_mem_context *mem_context,
 					     uint8_t *shared_buf,
 					     uint32_t shared_buf_len)
 {
 	if (mem_context->shared_mem_size < shared_buf_len)
 		return -EINVAL;
 	memset(mem_context->shared_buf, 0, mem_context->shared_mem_size);
 	memcpy((void *)mem_context->shared_buf, shared_buf, shared_buf_len);

 	return 0;
 }

 static bool is_ta_type_valid(enum ta_type_id ta_type)
 {
 	switch (ta_type) {
 	case TA_TYPE_RAS:
 		return true;
 	default:
 		return false;
 	}
 }

 static const struct ta_funcs ras_ta_funcs = {
 	.fn_ta_initialize = psp_ras_initialize,
 	.fn_ta_invoke    = psp_ras_invoke,
 	.fn_ta_terminate = psp_ras_terminate
 };

 static void set_ta_context_funcs(struct psp_context *psp,
 						      enum ta_type_id ta_type,
 						      struct ta_context **pcontext)
 {
 	switch (ta_type) {
 	case TA_TYPE_RAS:
 		*pcontext = &psp->ras_context.context;
 		psp->ta_funcs = &ras_ta_funcs;
 		break;
 	default:
 		break;
 	}
 }

 static const struct file_operations ta_load_debugfs_fops = {
 	.write  = ta_if_load_debugfs_write,
 	.llseek = default_llseek,
 	.owner  = THIS_MODULE
 };

 static const struct file_operations ta_unload_debugfs_fops = {
 	.write  = ta_if_unload_debugfs_write,
 	.llseek = default_llseek,
 	.owner  = THIS_MODULE
 };

 static const struct file_operations ta_invoke_debugfs_fops = {
 	.write  = ta_if_invoke_debugfs_write,
 	.llseek = default_llseek,
 	.owner  = THIS_MODULE
 };

 /*
  * DOC: AMDGPU TA debugfs interfaces
  *
  * Three debugfs interfaces can be opened by a program to
  * load/invoke/unload TA,
  *
  * - /sys/kernel/debug/dri/<N>/ta_if/ta_load
  * - /sys/kernel/debug/dri/<N>/ta_if/ta_invoke
  * - /sys/kernel/debug/dri/<N>/ta_if/ta_unload
  *
  * How to use the interfaces in a program?
  *
  * A program needs to provide transmit buffer to the interfaces
  * and will receive buffer from the interfaces below,
  *
  * - For TA load debugfs interface:
  *   Transmit buffer:
  *    - TA type (4bytes)
  *    - TA bin length (4bytes)
  *    - TA bin
  *   Receive buffer:
  *    - TA ID (4bytes)
  *
  * - For TA invoke debugfs interface:
  *   Transmit buffer:
  *    - TA type (4bytes)
  *    - TA ID (4bytes)
  *    - TA CMD ID (4bytes)
  *    - TA shard buf length
  *      (4bytes, value not beyond TA shared memory size)
  *    - TA shared buf
  *   Receive buffer:
  *    - TA shared buf
  *
  * - For TA unload debugfs interface:
  *   Transmit buffer:
  *    - TA type (4bytes)
  *    - TA ID (4bytes)
  */

 static ssize_t ta_if_load_debugfs_write(struct file *fp, const char *buf, size_t len, loff_t *off)
 {
 	uint32_t ta_type    = 0;
 	uint32_t ta_bin_len = 0;
 	uint8_t  *ta_bin    = NULL;
 	uint32_t copy_pos   = 0;
 	int      ret        = 0;

 	struct amdgpu_device *adev    = (struct amdgpu_device *)file_inode(fp)->i_private;
 	struct psp_context   *psp     = &adev->psp;
 	struct ta_context    *context = NULL;

 	if (!buf)
 		return -EINVAL;

 	ret = copy_from_user((void *)&ta_type, &buf[copy_pos], sizeof(uint32_t));
 	if (ret || (!is_ta_type_valid(ta_type)))
 		return -EFAULT;

 	copy_pos += sizeof(uint32_t);

 	ret = copy_from_user((void *)&ta_bin_len, &buf[copy_pos], sizeof(uint32_t));
 	if (ret)
 		return -EFAULT;

 	if (ta_bin_len > PSP_1_MEG)
 		return -EINVAL;

 	copy_pos += sizeof(uint32_t);

 	ta_bin = kzalloc(ta_bin_len, GFP_KERNEL);
 	if (!ta_bin)
 		return -ENOMEM;
 	if (copy_from_user((void *)ta_bin, &buf[copy_pos], ta_bin_len)) {
 		ret = -EFAULT;
 		goto err_free_bin;
 	}

 	/* Set TA context and functions */
 	set_ta_context_funcs(psp, ta_type, &context);

 	if (!psp->ta_funcs || !psp->ta_funcs->fn_ta_terminate) {
 		dev_err(adev->dev, "Unsupported function to terminate TA\n");
 		ret = -EOPNOTSUPP;
 		goto err_free_bin;
 	}

 	/*
 	 * Allocate TA shared buf in case shared buf was freed
 	 * due to loading TA failed before.
 	 */
 	if (!context->mem_context.shared_buf) {
 		ret = psp_ta_init_shared_buf(psp, &context->mem_context);
 		if (ret) {
 			ret = -ENOMEM;
 			goto err_free_bin;
 		}
 	}

 	ret = psp_fn_ta_terminate(psp);
 	if (ret || context->resp_status) {
 		dev_err(adev->dev,
 			"Failed to unload embedded TA (%d) and status (0x%X)\n",
 			ret, context->resp_status);
 		if (!ret)
 			ret = -EINVAL;
 		goto err_free_ta_shared_buf;
 	}

 	/* Prepare TA context for TA initialization */
 	context->ta_type                     = ta_type;
 	context->bin_desc.fw_version         = get_bin_version(ta_bin);
 	context->bin_desc.size_bytes         = ta_bin_len;
 	context->bin_desc.start_addr         = ta_bin;

 	if (!psp->ta_funcs->fn_ta_initialize) {
 		dev_err(adev->dev, "Unsupported function to initialize TA\n");
 		ret = -EOPNOTSUPP;
 		goto err_free_ta_shared_buf;
 	}

 	ret = psp_fn_ta_initialize(psp);
 	if (ret || context->resp_status) {
 		dev_err(adev->dev, "Failed to load TA via debugfs (%d) and status (0x%X)\n",
 			ret, context->resp_status);
 		if (!ret)
 			ret = -EINVAL;
 		goto err_free_ta_shared_buf;
 	}

 	if (copy_to_user((char *)buf, (void *)&context->session_id, sizeof(uint32_t)))
 		ret = -EFAULT;

 err_free_ta_shared_buf:
 	/* Only free TA shared buf when returns error code */
 	if (ret && context->mem_context.shared_buf)
 		psp_ta_free_shared_buf(&context->mem_context);
 err_free_bin:
 	kfree(ta_bin);

 	return ret;
 }

 static ssize_t ta_if_unload_debugfs_write(struct file *fp, const char *buf, size_t len, loff_t *off)
 {
 	uint32_t ta_type    = 0;
 	uint32_t ta_id      = 0;
 	uint32_t copy_pos   = 0;
 	int      ret        = 0;

 	struct amdgpu_device *adev    = (struct amdgpu_device *)file_inode(fp)->i_private;
 	struct psp_context   *psp     = &adev->psp;
 	struct ta_context    *context = NULL;

 	if (!buf)
 		return -EINVAL;

 	ret = copy_from_user((void *)&ta_type, &buf[copy_pos], sizeof(uint32_t));
 	if (ret || (!is_ta_type_valid(ta_type)))
 		return -EFAULT;

 	copy_pos += sizeof(uint32_t);

 	ret = copy_from_user((void *)&ta_id, &buf[copy_pos], sizeof(uint32_t));
 	if (ret)
 		return -EFAULT;

 	set_ta_context_funcs(psp, ta_type, &context);
 	context->session_id = ta_id;

 	if (!psp->ta_funcs || !psp->ta_funcs->fn_ta_terminate) {
 		dev_err(adev->dev, "Unsupported function to terminate TA\n");
 		return -EOPNOTSUPP;
 	}

 	ret = psp_fn_ta_terminate(psp);
 	if (ret || context->resp_status) {
 		dev_err(adev->dev, "Failed to unload TA via debugfs (%d) and status (0x%X)\n",
 			ret, context->resp_status);
 		if (!ret)
 			ret = -EINVAL;
 	}

 	if (context->mem_context.shared_buf)
 		psp_ta_free_shared_buf(&context->mem_context);

 	return ret;
 }

 static ssize_t ta_if_invoke_debugfs_write(struct file *fp, const char *buf, size_t len, loff_t *off)
 {
 	uint32_t ta_type        = 0;
 	uint32_t ta_id          = 0;
 	uint32_t cmd_id         = 0;
 	uint32_t shared_buf_len = 0;
 	uint8_t *shared_buf     = NULL;
 	uint32_t copy_pos       = 0;
 	int      ret            = 0;

 	struct amdgpu_device *adev    = (struct amdgpu_device *)file_inode(fp)->i_private;
 	struct psp_context   *psp     = &adev->psp;
 	struct ta_context    *context = NULL;

 	if (!buf)
 		return -EINVAL;

 	ret = copy_from_user((void *)&ta_type, &buf[copy_pos], sizeof(uint32_t));
 	if (ret)
 		return -EFAULT;
 	copy_pos += sizeof(uint32_t);

 	ret = copy_from_user((void *)&ta_id, &buf[copy_pos], sizeof(uint32_t));
 	if (ret)
 		return -EFAULT;
 	copy_pos += sizeof(uint32_t);

 	ret = copy_from_user((void *)&cmd_id, &buf[copy_pos], sizeof(uint32_t));
 	if (ret)
 		return -EFAULT;
 	copy_pos += sizeof(uint32_t);

 	ret = copy_from_user((void *)&shared_buf_len, &buf[copy_pos], sizeof(uint32_t));
 	if (ret)
 		return -EFAULT;
 	copy_pos += sizeof(uint32_t);

 	shared_buf = kzalloc(shared_buf_len, GFP_KERNEL);
 	if (!shared_buf)
 		return -ENOMEM;
 	if (copy_from_user((void *)shared_buf, &buf[copy_pos], shared_buf_len)) {
 		ret = -EFAULT;
 		goto err_free_shared_buf;
 	}

 	set_ta_context_funcs(psp, ta_type, &context);

 	if (!context || !context->initialized) {
 		dev_err(adev->dev, "TA is not initialized\n");
 		ret = -EINVAL;
 		goto err_free_shared_buf;
 	}

 	if (!psp->ta_funcs || !psp->ta_funcs->fn_ta_invoke) {
 		dev_err(adev->dev, "Unsupported function to invoke TA\n");
 		ret = -EOPNOTSUPP;
 		goto err_free_shared_buf;
 	}

 	context->session_id = ta_id;

 	mutex_lock(&psp->ras_context.mutex);
 	ret = prep_ta_mem_context(&context->mem_context, shared_buf, shared_buf_len);
 	if (ret)
 		goto err_free_shared_buf;

 	ret = psp_fn_ta_invoke(psp, cmd_id);
 	if (ret || context->resp_status) {
 		dev_err(adev->dev, "Failed to invoke TA via debugfs (%d) and status (0x%X)\n",
 			ret, context->resp_status);
 		if (!ret) {
 			ret = -EINVAL;
 			goto err_free_shared_buf;
 		}
 	}

 	if (copy_to_user((char *)&buf[copy_pos], context->mem_context.shared_buf, shared_buf_len))
 		ret = -EFAULT;

 err_free_shared_buf:
 	mutex_unlock(&psp->ras_context.mutex);
 	kfree(shared_buf);

 	return ret;
 }

 void amdgpu_ta_if_debugfs_init(struct amdgpu_device *adev)
 {
 	struct drm_minor *minor = adev_to_drm(adev)->primary;

 	struct dentry *dir = debugfs_create_dir("ta_if", minor->debugfs_root);

 	debugfs_create_file("ta_load", 0200, dir, adev,
 				     &ta_load_debugfs_fops);

 	debugfs_create_file("ta_unload", 0200, dir,
 				     adev, &ta_unload_debugfs_fops);

 	debugfs_create_file("ta_invoke", 0200, dir,
 				     adev, &ta_invoke_debugfs_fops);
 }

 #else
 void amdgpu_ta_if_debugfs_init(struct amdgpu_device *adev)
 {

 }
 #endif
	/*
	* Copyright 2022 Advanced Micro Devices, Inc.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	* OTHER DEALINGS IN THE SOFTWARE.
	*
	*/

	#include "amdgpu.h"
	#include "amdgpu_psp_ta.h"

	#if defined(CONFIG_DEBUG_FS)

	static ssize_t ta_if_load_debugfs_write(struct file fp, const char buf,
	size_t len, loff_t *off);
	static ssize_t ta_if_unload_debugfs_write(struct file fp, const char buf,
	size_t len, loff_t *off);
	static ssize_t ta_if_invoke_debugfs_write(struct file fp, const char buf,
	size_t len, loff_t *off);

	static uint32_t get_bin_version(const uint8_t *bin)
	{
	const struct common_firmware_header *hdr =
	(const struct common_firmware_header *)bin;

	return hdr->ucode_version;
	}

	static int prep_ta_mem_context(struct ta_mem_context *mem_context,
	uint8_t *shared_buf,
	uint32_t shared_buf_len)
	{
	if (mem_context->shared_mem_size < shared_buf_len)
	return -EINVAL;
	memset(mem_context->shared_buf, 0, mem_context->shared_mem_size);
	memcpy((void *)mem_context->shared_buf, shared_buf, shared_buf_len);

	return 0;
	}

	static bool is_ta_type_valid(enum ta_type_id ta_type)
	{
	switch (ta_type) {
	case TA_TYPE_RAS:
	return true;
	default:
	return false;
	}
	}

	static const struct ta_funcs ras_ta_funcs = {
	.fn_ta_initialize = psp_ras_initialize,
	.fn_ta_invoke = psp_ras_invoke,
	.fn_ta_terminate = psp_ras_terminate
	};

	static void set_ta_context_funcs(struct psp_context *psp,
	enum ta_type_id ta_type,
	struct ta_context **pcontext)
	{
	switch (ta_type) {
	case TA_TYPE_RAS:
	*pcontext = &psp->ras_context.context;
	psp->ta_funcs = &ras_ta_funcs;
	break;
	default:
	break;
	}
	}

	static const struct file_operations ta_load_debugfs_fops = {
	.write = ta_if_load_debugfs_write,
	.llseek = default_llseek,
	.owner = THIS_MODULE
	};

	static const struct file_operations ta_unload_debugfs_fops = {
	.write = ta_if_unload_debugfs_write,
	.llseek = default_llseek,
	.owner = THIS_MODULE
	};

	static const struct file_operations ta_invoke_debugfs_fops = {
	.write = ta_if_invoke_debugfs_write,
	.llseek = default_llseek,
	.owner = THIS_MODULE
	};

	/*
	* DOC: AMDGPU TA debugfs interfaces
	*
	* Three debugfs interfaces can be opened by a program to
	* load/invoke/unload TA,
	*
	* - /sys/kernel/debug/dri/<N>/ta_if/ta_load
	* - /sys/kernel/debug/dri/<N>/ta_if/ta_invoke
	* - /sys/kernel/debug/dri/<N>/ta_if/ta_unload
	*
	* How to use the interfaces in a program?
	*
	* A program needs to provide transmit buffer to the interfaces
	* and will receive buffer from the interfaces below,
	*
	* - For TA load debugfs interface:
	* Transmit buffer:
	* - TA type (4bytes)
	* - TA bin length (4bytes)
	* - TA bin
	* Receive buffer:
	* - TA ID (4bytes)
	*
	* - For TA invoke debugfs interface:
	* Transmit buffer:
	* - TA type (4bytes)
	* - TA ID (4bytes)
	* - TA CMD ID (4bytes)
	* - TA shard buf length
	* (4bytes, value not beyond TA shared memory size)
	* - TA shared buf
	* Receive buffer:
	* - TA shared buf
	*
	* - For TA unload debugfs interface:
	* Transmit buffer:
	* - TA type (4bytes)
	* - TA ID (4bytes)
	*/

	static ssize_t ta_if_load_debugfs_write(struct file fp, const char buf, size_t len, loff_t *off)
	{
	uint32_t ta_type = 0;
	uint32_t ta_bin_len = 0;
	uint8_t *ta_bin = NULL;
	uint32_t copy_pos = 0;
	int ret = 0;

	struct amdgpu_device adev = (struct amdgpu_device )file_inode(fp)->i_private;
	struct psp_context *psp = &adev->psp;
	struct ta_context *context = NULL;

	if (!buf)
	return -EINVAL;

	ret = copy_from_user((void *)&ta_type, &buf[copy_pos], sizeof(uint32_t));
	if (ret \|\| (!is_ta_type_valid(ta_type)))
	return -EFAULT;

	copy_pos += sizeof(uint32_t);

	ret = copy_from_user((void *)&ta_bin_len, &buf[copy_pos], sizeof(uint32_t));
	if (ret)
	return -EFAULT;

	if (ta_bin_len > PSP_1_MEG)
	return -EINVAL;

	copy_pos += sizeof(uint32_t);

	ta_bin = kzalloc(ta_bin_len, GFP_KERNEL);
	if (!ta_bin)
	return -ENOMEM;
	if (copy_from_user((void *)ta_bin, &buf[copy_pos], ta_bin_len)) {
	ret = -EFAULT;
	goto err_free_bin;
	}

	/* Set TA context and functions */
	set_ta_context_funcs(psp, ta_type, &context);

	if (!psp->ta_funcs \|\| !psp->ta_funcs->fn_ta_terminate) {
	dev_err(adev->dev, "Unsupported function to terminate TA\n");
	ret = -EOPNOTSUPP;
	goto err_free_bin;
	}

	/*
	* Allocate TA shared buf in case shared buf was freed
	* due to loading TA failed before.
	*/
	if (!context->mem_context.shared_buf) {
	ret = psp_ta_init_shared_buf(psp, &context->mem_context);
	if (ret) {
	ret = -ENOMEM;
	goto err_free_bin;
	}
	}

	ret = psp_fn_ta_terminate(psp);
	if (ret \|\| context->resp_status) {
	dev_err(adev->dev,
	"Failed to unload embedded TA (%d) and status (0x%X)\n",
	ret, context->resp_status);
	if (!ret)
	ret = -EINVAL;
	goto err_free_ta_shared_buf;
	}

	/* Prepare TA context for TA initialization */
	context->ta_type = ta_type;
	context->bin_desc.fw_version = get_bin_version(ta_bin);
	context->bin_desc.size_bytes = ta_bin_len;
	context->bin_desc.start_addr = ta_bin;

	if (!psp->ta_funcs->fn_ta_initialize) {
	dev_err(adev->dev, "Unsupported function to initialize TA\n");
	ret = -EOPNOTSUPP;
	goto err_free_ta_shared_buf;
	}

	ret = psp_fn_ta_initialize(psp);
	if (ret \|\| context->resp_status) {
	dev_err(adev->dev, "Failed to load TA via debugfs (%d) and status (0x%X)\n",
	ret, context->resp_status);
	if (!ret)
	ret = -EINVAL;
	goto err_free_ta_shared_buf;
	}

	if (copy_to_user((char )buf, (void )&context->session_id, sizeof(uint32_t)))
	ret = -EFAULT;

	err_free_ta_shared_buf:
	/* Only free TA shared buf when returns error code */
	if (ret && context->mem_context.shared_buf)
	psp_ta_free_shared_buf(&context->mem_context);
	err_free_bin:
	kfree(ta_bin);

	return ret;
	}

	static ssize_t ta_if_unload_debugfs_write(struct file fp, const char buf, size_t len, loff_t *off)
	{
	uint32_t ta_type = 0;
	uint32_t ta_id = 0;
	uint32_t copy_pos = 0;
	int ret = 0;

	struct amdgpu_device adev = (struct amdgpu_device )file_inode(fp)->i_private;
	struct psp_context *psp = &adev->psp;
	struct ta_context *context = NULL;

	if (!buf)
	return -EINVAL;

	ret = copy_from_user((void *)&ta_type, &buf[copy_pos], sizeof(uint32_t));
	if (ret \|\| (!is_ta_type_valid(ta_type)))
	return -EFAULT;

	copy_pos += sizeof(uint32_t);

	ret = copy_from_user((void *)&ta_id, &buf[copy_pos], sizeof(uint32_t));
	if (ret)
	return -EFAULT;

	set_ta_context_funcs(psp, ta_type, &context);
	context->session_id = ta_id;

	if (!psp->ta_funcs \|\| !psp->ta_funcs->fn_ta_terminate) {
	dev_err(adev->dev, "Unsupported function to terminate TA\n");
	return -EOPNOTSUPP;
	}

	ret = psp_fn_ta_terminate(psp);
	if (ret \|\| context->resp_status) {
	dev_err(adev->dev, "Failed to unload TA via debugfs (%d) and status (0x%X)\n",
	ret, context->resp_status);
	if (!ret)
	ret = -EINVAL;
	}

	if (context->mem_context.shared_buf)
	psp_ta_free_shared_buf(&context->mem_context);

	return ret;
	}

	static ssize_t ta_if_invoke_debugfs_write(struct file fp, const char buf, size_t len, loff_t *off)
	{
	uint32_t ta_type = 0;
	uint32_t ta_id = 0;
	uint32_t cmd_id = 0;
	uint32_t shared_buf_len = 0;
	uint8_t *shared_buf = NULL;
	uint32_t copy_pos = 0;
	int ret = 0;

	struct amdgpu_device adev = (struct amdgpu_device )file_inode(fp)->i_private;
	struct psp_context *psp = &adev->psp;
	struct ta_context *context = NULL;

	if (!buf)
	return -EINVAL;

	ret = copy_from_user((void *)&ta_type, &buf[copy_pos], sizeof(uint32_t));
	if (ret)
	return -EFAULT;
	copy_pos += sizeof(uint32_t);

	ret = copy_from_user((void *)&ta_id, &buf[copy_pos], sizeof(uint32_t));
	if (ret)
	return -EFAULT;
	copy_pos += sizeof(uint32_t);

	ret = copy_from_user((void *)&cmd_id, &buf[copy_pos], sizeof(uint32_t));
	if (ret)
	return -EFAULT;
	copy_pos += sizeof(uint32_t);

	ret = copy_from_user((void *)&shared_buf_len, &buf[copy_pos], sizeof(uint32_t));
	if (ret)
	return -EFAULT;
	copy_pos += sizeof(uint32_t);

	shared_buf = kzalloc(shared_buf_len, GFP_KERNEL);
	if (!shared_buf)
	return -ENOMEM;
	if (copy_from_user((void *)shared_buf, &buf[copy_pos], shared_buf_len)) {
	ret = -EFAULT;
	goto err_free_shared_buf;
	}

	set_ta_context_funcs(psp, ta_type, &context);

	if (!context \|\| !context->initialized) {
	dev_err(adev->dev, "TA is not initialized\n");
	ret = -EINVAL;
	goto err_free_shared_buf;
	}

	if (!psp->ta_funcs \|\| !psp->ta_funcs->fn_ta_invoke) {
	dev_err(adev->dev, "Unsupported function to invoke TA\n");
	ret = -EOPNOTSUPP;
	goto err_free_shared_buf;
	}

	context->session_id = ta_id;

	mutex_lock(&psp->ras_context.mutex);
	ret = prep_ta_mem_context(&context->mem_context, shared_buf, shared_buf_len);
	if (ret)
	goto err_free_shared_buf;

	ret = psp_fn_ta_invoke(psp, cmd_id);
	if (ret \|\| context->resp_status) {
	dev_err(adev->dev, "Failed to invoke TA via debugfs (%d) and status (0x%X)\n",
	ret, context->resp_status);
	if (!ret) {
	ret = -EINVAL;
	goto err_free_shared_buf;
	}
	}

	if (copy_to_user((char *)&buf[copy_pos], context->mem_context.shared_buf, shared_buf_len))
	ret = -EFAULT;

	err_free_shared_buf:
	mutex_unlock(&psp->ras_context.mutex);
	kfree(shared_buf);

	return ret;
	}

	void amdgpu_ta_if_debugfs_init(struct amdgpu_device *adev)
	{
	struct drm_minor *minor = adev_to_drm(adev)->primary;

	struct dentry *dir = debugfs_create_dir("ta_if", minor->debugfs_root);

	debugfs_create_file("ta_load", 0200, dir, adev,
	&ta_load_debugfs_fops);

	debugfs_create_file("ta_unload", 0200, dir,
	adev, &ta_unload_debugfs_fops);

	debugfs_create_file("ta_invoke", 0200, dir,
	adev, &ta_invoke_debugfs_fops);
	}

	#else
	void amdgpu_ta_if_debugfs_init(struct amdgpu_device *adev)
	{

	}
	#endif