path: root/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c

/*
 * Copyright 2018 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 <linux/debugfs.h>
#include <linux/list.h>
#include <linux/module.h>
#include "amdgpu.h"
#include "amdgpu_ras.h"

struct ras_ih_data {
	/* interrupt bottom half */
	struct work_struct ih_work;
	int inuse;
	/* IP callback */
	ras_ih_cb cb;
	/* full of entries */
	unsigned char *ring;
	unsigned int ring_size;
	unsigned int element_size;
	unsigned int aligned_element_size;
	unsigned int rptr;
	unsigned int wptr;
};

struct ras_fs_data {
	char sysfs_name[32];
	char debugfs_name[32];
};

struct ras_err_data {
	unsigned long ue_count;
	unsigned long ce_count;
};

struct ras_err_handler_data {
	/* point to bad pages array */
	struct {
		unsigned long bp;
		struct amdgpu_bo *bo;
	} *bps;
	/* the count of entries */
	int count;
	/* the space can place new entries */
	int space_left;
	/* last reserved entry's index + 1 */
	int last_reserved;
};

struct ras_manager {
	struct ras_common_if head;
	/* reference count */
	int use;
	/* ras block link */
	struct list_head node;
	/* the device */
	struct amdgpu_device *adev;
	/* debugfs */
	struct dentry *ent;
	/* sysfs */
	struct device_attribute sysfs_attr;
	int attr_inuse;

	/* fs node name */
	struct ras_fs_data fs_data;

	/* IH data */
	struct ras_ih_data ih_data;

	struct ras_err_data err_data;
};

const char *ras_error_string[] = {
	"none",
	"parity",
	"single_correctable",
	"multi_uncorrectable",
	"poison",
};

const char *ras_block_string[] = {
	"umc",
	"sdma",
	"gfx",
	"mmhub",
	"athub",
	"pcie_bif",
	"hdp",
	"xgmi_wafl",
	"df",
	"smn",
	"sem",
	"mp0",
	"mp1",
	"fuse",
};

#define ras_err_str(i) (ras_error_string[ffs(i)])
#define ras_block_str(i) (ras_block_string[i])

static void amdgpu_ras_self_test(struct amdgpu_device *adev)
{
	/* TODO */
}

static ssize_t amdgpu_ras_debugfs_read(struct file *f, char __user *buf,
					size_t size, loff_t *pos)
{
	struct ras_manager *obj = (struct ras_manager *)file_inode(f)->i_private;
	struct ras_query_if info = {
		.head = obj->head,
	};
	ssize_t s;
	char val[128];

	if (amdgpu_ras_error_query(obj->adev, &info))
		return -EINVAL;

	s = snprintf(val, sizeof(val), "%s: %lu\n%s: %lu\n",
			"ue", info.ue_count,
			"ce", info.ce_count);
	if (*pos >= s)
		return 0;

	s -= *pos;
	s = min_t(u64, s, size);


	if (copy_to_user(buf, &val[*pos], s))
		return -EINVAL;

	*pos