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Diffstat (limited to 'drivers/misc/bcm-vk/bcm_vk_msg.h')
-rw-r--r--drivers/misc/bcm-vk/bcm_vk_msg.h163
1 files changed, 163 insertions, 0 deletions
diff --git a/drivers/misc/bcm-vk/bcm_vk_msg.h b/drivers/misc/bcm-vk/bcm_vk_msg.h
new file mode 100644
index 000000000..56784c889
--- /dev/null
+++ b/drivers/misc/bcm-vk/bcm_vk_msg.h
@@ -0,0 +1,163 @@
+/* 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[];
+};
+
+/* 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