| /* |
| * Copyright (c) 2014-2015, 2017, The Linux Foundation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 and |
| * only version 2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #ifndef __SEEMP_LOGK_H__ |
| #define __SEEMP_LOGK_H__ |
| |
| #define OBSERVER_VERSION 0x01 |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/ioctl.h> |
| #include <linux/cdev.h> |
| #include <linux/device.h> |
| #include <linux/poll.h> |
| #include <linux/wait.h> |
| #include <linux/fs.h> |
| #include <linux/slab.h> |
| #include <linux/errno.h> |
| #include <linux/err.h> |
| #include <linux/mm.h> |
| #include <linux/sched.h> |
| #include <linux/mutex.h> |
| #include <linux/vmalloc.h> |
| #include <asm/ioctls.h> |
| |
| #define seemp_LOGK_NUM_DEVS 1 |
| #define seemp_LOGK_DEV_NAME "seemplog" |
| |
| /* |
| * The logcat driver on Android uses four 256k ring buffers |
| * here, we use two ring buffers of the same size. |
| * we think this is reasonable |
| */ |
| #define FULL_BUF_SIZE (64 * 1024 * 1024) |
| #define HALF_BUF_SIZE (32 * 1024 * 1024) |
| #define FULL_BLOCKS (8 * 1024) |
| #define HALF_BLOCKS (4 * 1024) |
| |
| #define READER_NOT_READY 0 |
| #define READER_READY 1 |
| |
| #define MAGIC 'z' |
| |
| #define SEEMP_CMD_RESERVE_RDBLKS _IOR(MAGIC, 1, int) |
| #define SEEMP_CMD_RELEASE_RDBLKS _IO(MAGIC, 2) |
| #define SEEMP_CMD_GET_RINGSZ _IOR(MAGIC, 3, int) |
| #define SEEMP_CMD_GET_BLKSZ _IOR(MAGIC, 4, int) |
| #define SEEMP_CMD_SET_MASK _IO(MAGIC, 5) |
| #define SEEMP_CMD_SET_MAPPING _IO(MAGIC, 6) |
| #define SEEMP_CMD_CHECK_FILTER _IOR(MAGIC, 7, int) |
| |
| struct read_range { |
| int start_idx; |
| int num; |
| }; |
| |
| struct seemp_logk_dev { |
| unsigned int major; |
| unsigned int minor; |
| |
| struct cdev cdev; |
| struct class *cls; |
| /*the full buffer*/ |
| struct seemp_logk_blk *ring; |
| /*an array of blks*/ |
| unsigned int ring_sz; |
| unsigned int blk_sz; |
| |
| int num_tot_blks; |
| |
| int num_write_avail_blks; |
| int num_write_in_prog_blks; |
| |
| int num_read_avail_blks; |
| int num_read_in_prog_blks; |
| |
| int num_writers; |
| |
| /* |
| * there is always one reader |
| * which is the observer daemon |
| * therefore there is no necessity |
| * for num_readers variable |
| */ |
| |
| /* |
| * read_idx and write_idx loop through from zero to ring_sz, |
| * and then back to zero in a circle, as they advance |
| * based on the reader's and writers' accesses |
| */ |
| int read_idx; |
| |
| int write_idx; |
| |
| /* |
| * wait queues |
| * readers_wq: implement wait for readers |
| * writers_wq: implement wait for writers |
| * |
| * whether writers are blocked or not is driven by the policy: |
| * case 1: (best_effort_logging == 1) |
| * writers are not blocked, and |
| * when there is no mem in the ring to store logs, |
| * the logs are simply dropped. |
| * case 2: (best_effort_logging == 0) |
| * when there is no mem in the ring to store logs, |
| * the process gets blocked until there is space. |
| */ |
| wait_queue_head_t readers_wq; |
| wait_queue_head_t writers_wq; |
| |
| /* |
| * protects everything in the device |
| * including ring buffer and all the num_ variables |
| * spinlock_t lock; |
| */ |
| struct mutex lock; |
| }; |
| |
| #define BLK_SIZE 256 |
| #define BLK_HDR_SIZE 64 |
| #define TS_SIZE 20 |
| #define BLK_MAX_MSG_SZ (BLK_SIZE - BLK_HDR_SIZE) |
| |
| struct blk_payload { |
| __u32 api_id; /* event API id */ |
| char msg[BLK_MAX_MSG_SZ]; /* event parameters */ |
| } __packed; |
| |
| struct seemp_logk_blk { |
| __u8 status; /* bits: 0->valid/invalid; 1-7: unused as of now! */ |
| __u16 len; /* length of the payload */ |
| __u8 version; /* version number */ |
| __s32 pid; /* generating process's pid */ |
| __s32 uid; /* generating process's uid - app specific */ |
| __s32 tid; /* generating process's tid */ |
| __s32 sec; /* seconds since Epoch */ |
| __s32 nsec; /* nanoseconds */ |
| char ts[TS_SIZE]; /* Time Stamp */ |
| char appname[TASK_COMM_LEN]; |
| struct blk_payload payload; |
| } __packed; |
| |
| |
| extern unsigned int kmalloc_flag; |
| |
| struct seemp_source_mask { |
| __u32 hash; |
| bool isOn; |
| }; |
| #endif |