cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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amdgpu_rap.c (4089B)

      1/*
      2 * Copyright 2020 Advanced Micro Devices, Inc.
      3 *
      4 * Permission is hereby granted, free of charge, to any person obtaining a
      5 * copy of this software and associated documentation files (the "Software"),
      6 * to deal in the Software without restriction, including without limitation
      7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8 * and/or sell copies of the Software, and to permit persons to whom the
      9 * Software is furnished to do so, subject to the following conditions:
     10 *
     11 * The above copyright notice and this permission notice shall be included in
     12 * all copies or substantial portions of the Software.
     13 *
     14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20 * OTHER DEALINGS IN THE SOFTWARE.
     21 *
     22 *
     23 */
     24#include <linux/debugfs.h>
     25#include <linux/pm_runtime.h>
     26
     27#include "amdgpu.h"
     28#include "amdgpu_rap.h"
     29
     30/**
     31 * DOC: AMDGPU RAP debugfs test interface
     32 *
     33 * how to use?
     34 * echo opcode > <debugfs_dir>/dri/xxx/rap_test
     35 *
     36 * opcode:
     37 * currently, only 2 is supported by Linux host driver,
     38 * opcode 2 stands for TA_CMD_RAP__VALIDATE_L0, used to
     39 * trigger L0 policy validation, you can refer more detail
     40 * from header file ta_rap_if.h
     41 *
     42 */
     43static ssize_t amdgpu_rap_debugfs_write(struct file *f, const char __user *buf,
     44		size_t size, loff_t *pos)
     45{
     46	struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private;
     47	struct ta_rap_shared_memory *rap_shared_mem;
     48	struct ta_rap_cmd_output_data *rap_cmd_output;
     49	struct drm_device *dev = adev_to_drm(adev);
     50	uint32_t op;
     51	enum ta_rap_status status;
     52	int ret;
     53
     54	if (*pos || size != 2)
     55		return -EINVAL;
     56
     57	ret = kstrtouint_from_user(buf, size, *pos, &op);
     58	if (ret)
     59		return ret;
     60
     61	ret = pm_runtime_get_sync(dev->dev);
     62	if (ret < 0) {
     63		pm_runtime_put_autosuspend(dev->dev);
     64		return ret;
     65	}
     66
     67	/* make sure gfx core is on, RAP TA cann't handle
     68	 * GFX OFF case currently.
     69	 */
     70	amdgpu_gfx_off_ctrl(adev, false);
     71
     72	switch (op) {
     73	case 2:
     74		ret = psp_rap_invoke(&adev->psp, op, &status);
     75		if (!ret && status == TA_RAP_STATUS__SUCCESS) {
     76			dev_info(adev->dev, "RAP L0 validate test success.\n");
     77		} else {
     78			rap_shared_mem = (struct ta_rap_shared_memory *)
     79					 adev->psp.rap_context.context.mem_context.shared_buf;
     80			rap_cmd_output = &(rap_shared_mem->rap_out_message.output);
     81
     82			dev_info(adev->dev, "RAP test failed, the output is:\n");
     83			dev_info(adev->dev, "\tlast_subsection: 0x%08x.\n",
     84				 rap_cmd_output->last_subsection);
     85			dev_info(adev->dev, "\tnum_total_validate: 0x%08x.\n",
     86				 rap_cmd_output->num_total_validate);
     87			dev_info(adev->dev, "\tnum_valid: 0x%08x.\n",
     88				 rap_cmd_output->num_valid);
     89			dev_info(adev->dev, "\tlast_validate_addr: 0x%08x.\n",
     90				 rap_cmd_output->last_validate_addr);
     91			dev_info(adev->dev, "\tlast_validate_val: 0x%08x.\n",
     92				 rap_cmd_output->last_validate_val);
     93			dev_info(adev->dev, "\tlast_validate_val_exptd: 0x%08x.\n",
     94				 rap_cmd_output->last_validate_val_exptd);
     95		}
     96		break;
     97	default:
     98		dev_info(adev->dev, "Unsupported op id: %d, ", op);
     99		dev_info(adev->dev, "Only support op 2(L0 validate test).\n");
    100		break;
    101	}
    102
    103	amdgpu_gfx_off_ctrl(adev, true);
    104	pm_runtime_mark_last_busy(dev->dev);
    105	pm_runtime_put_autosuspend(dev->dev);
    106
    107	return size;
    108}
    109
    110static const struct file_operations amdgpu_rap_debugfs_ops = {
    111	.owner = THIS_MODULE,
    112	.read = NULL,
    113	.write = amdgpu_rap_debugfs_write,
    114	.llseek = default_llseek
    115};
    116
    117void amdgpu_rap_debugfs_init(struct amdgpu_device *adev)
    118{
    119#if defined(CONFIG_DEBUG_FS)
    120	struct drm_minor *minor = adev_to_drm(adev)->primary;
    121
    122	if (!adev->psp.rap_context.context.initialized)
    123		return;
    124
    125	debugfs_create_file("rap_test", S_IWUSR, minor->debugfs_root,
    126				adev, &amdgpu_rap_debugfs_ops);
    127#endif
    128}