/* 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 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 */ unsignedint 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;
};
#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];
/* * 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 */
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