/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright 2018-2020 Broadcom.
*/
#ifndef BCM_VK_MSG_H
#define BCM_VK_MSG_H
#include <uapi/linux/misc/bcm_vk.h>
#include "bcm_vk_sg.h"
/* Single message queue control structure */
struct bcm_vk_msgq {
u16 type; /* queue type */
u16 num; /* queue number */
u32 start; /* offset in BAR1 where the queue memory starts */
u32 rd_idx; /* read idx */
u32 wr_idx; /* write idx */
u32 size; /*
* size, which is in number of 16byte blocks,
* to align with the message data structure.
*/
u32 nxt; /*
* nxt offset to the next msg queue struct.
* This is to provide flexibity for alignment purposes.
*/
/* Least significant 16 bits in below field hold doorbell register offset */
#define DB_SHIFT 16
u32 db_offset; /* queue doorbell register offset in BAR0 */
u32 rsvd;
};
/*
* Structure to record static info from the msgq sync. We keep local copy
* for some of these variables for both performance + checking purpose.
*/
struct bcm_vk_sync_qinfo {
void __iomem *q_start;
u32 q_size;
u32 q_mask;
u32 q_low;
u32 q_db_offset;
};
#define VK_MSGQ_MAX_NR 4 /* Maximum number of message queues */
/*
* message block - basic unit in the message where a message's size is always
* N x sizeof(basic_block)
*/
struct vk_msg_blk {
u8 function_id;
#define VK_FID_TRANS_BUF 5
#define VK_FID_SHUTDOWN 8
#define VK_FID_INIT 9
u8 size; /* size of the message in number of vk_msg_blk's */
u16 trans_id; /* transport id, queue & msg_id */
u32 context_id;
#define VK_NEW_CTX 0
u32 cmd;
#define VK_CMD_PLANES_MASK 0x000f /* number of planes to up/download */
#define VK_CMD_UPLOAD 0x0400 /* memory transfer to vk */
#define VK_CMD_DOWNLOAD 0x0500 /* memory transfer from vk */
#define VK_CMD_MASK 0x0f00 /* command mask */
u32 arg;
};
/* vk_msg_blk is 16 bytes fixed */
#define VK_MSGQ_BLK_SIZE (sizeof(struct vk_msg_blk))
/* shift for fast division of basic msg blk size */
#define VK_MSGQ_BLK_SZ_SHIFT 4
/* use msg_id 0 for any simplex host2vk communication */
#define VK_SIMPLEX_MSG_ID 0
/* context per session opening of sysfs */
struct bcm_vk_ctx {
struct list_head node; /* use for linkage in Hash Table */
unsigned int idx;
bool in_use;
pid_t pid;
u32 hash_idx;
u32 q_num; /* queue number used by the stream */
struct miscdevice *miscdev;
atomic_t pend_cnt; /* number of items pending to be read from host */
atomic_t dma_cnt; /* any dma transaction outstanding */
wait_queue_head_t rd_wq;
};
/* pid hash table entry */
struct bcm_vk_ht_entry {
struct list_head head;
};
#define VK_DMA_MAX_ADDRS 4 /* Max 4 DMA Addresses */
/* structure for house keeping a single work entry */
struct bcm_vk_wkent {
struct list_head node; /* for linking purpose */
struct bcm_vk_ctx *ctx;
/* Store up to 4 dma pointers */
struct bcm_vk_dma dma[VK_DMA_MAX_ADDRS];
u32 to_h_blks; /* response */
struct vk_msg_blk *to_h_msg;
/*
* put the to_v_msg at the end so that we could simply append to_v msg
* to the end of the allocated block
*/
u32 usr_msg_id;
u32 to_v_blks;
u32 seq_num;
struct vk_msg_blk to_v_msg[] __counted_by(to_v_blks);
};
/* queue stats counters */
struct bcm_vk_qs_cnts {
u32 cnt; /* general counter, used to limit output */
u32 acc_sum;
u32 max_occ; /* max during a sampling period */
u32 max_abs; /* the abs max since reset */
};
/* control channel structure for either to_v or to_h communication */
struct bcm_vk_msg_chan {
u32 q_nr;
/* Mutex to access msgq */
struct mutex msgq_mutex;
/* pointing to BAR locations */
struct bcm_vk_msgq __iomem *msgq[VK_MSGQ_MAX_NR];
/* Spinlock to access pending queue */
spinlock_t pendq_lock;
/* for temporary storing pending items, one for each queue */
struct list_head pendq[VK_MSGQ_MAX_NR];
/* static queue info from the sync */
struct bcm_vk_sync_qinfo sync_qinfo[VK_MSGQ_MAX_NR];
};
/* totol number of message q allowed by the driver */
#define VK_MSGQ_PER_CHAN_MAX 3
#define VK_MSGQ_NUM_DEFAULT (VK_MSGQ_PER_CHAN_MAX - 1)
/* total number of supported ctx, 32 ctx each for 5 components */
#define VK_CMPT_CTX_MAX (32 * 5)
/* hash table defines to store the opened FDs */
#define VK_PID_HT_SHIFT_BIT 7 /* 128 */
#define VK_PID_HT_SZ BIT(VK_PID_HT_SHIFT_BIT)
/* The following are offsets of DDR info provided by the vk card */
#define VK_BAR0_SEG_SIZE (4 * SZ_1K) /* segment size for BAR0 */
/* shutdown types supported */
#define VK_SHUTDOWN_PID 1
#define VK_SHUTDOWN_GRACEFUL 2
#endif
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