[PATCH V1] accel/amdxdna: Fix incorrect size of ERT_START_NPU commands

[Lizhi Hou]

When multiple ERT_START_NPU commands are combined in one buffer, the
buffer size calculation is incorrect. Also, the condition to make sure
the buffer size is not beyond 4K is also fixed.

Fixes: aac243092b70 ("accel/amdxdna: Add command execution")
Signed-off-by: Lizhi Hou <lizhi....@amd.com>
---
 drivers/accel/amdxdna/aie2_message.c  |  6 +++---
 drivers/accel/amdxdna/aie2_msg_priv.h | 10 ++++------
 2 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/accel/amdxdna/aie2_message.c 
b/drivers/accel/amdxdna/aie2_message.c
index bf4219e32cc1..82412eec9a4b 100644
--- a/drivers/accel/amdxdna/aie2_message.c
+++ b/drivers/accel/amdxdna/aie2_message.c
@@ -525,7 +525,7 @@ aie2_cmdlist_fill_one_slot_cf(void *cmd_buf, u32 offset,
        if (!payload)
                return -EINVAL;
 
-       if (!slot_cf_has_space(offset, payload_len))
+       if (!slot_has_space(*buf, offset, payload_len))
                return -ENOSPC;
 
        buf->cu_idx = cu_idx;
@@ -558,7 +558,7 @@ aie2_cmdlist_fill_one_slot_dpu(void *cmd_buf, u32 offset,
        if (payload_len < sizeof(*sn) || arg_sz > MAX_DPU_ARGS_SIZE)
                return -EINVAL;
 
-       if (!slot_dpu_has_space(offset, arg_sz))
+       if (!slot_has_space(*buf, offset, arg_sz))
                return -ENOSPC;
 
        buf->inst_buf_addr = sn->buffer;
@@ -569,7 +569,7 @@ aie2_cmdlist_fill_one_slot_dpu(void *cmd_buf, u32 offset,
        memcpy(buf->args, sn->prop_args, arg_sz);
 
        /* Accurate buf size to hint firmware to do necessary copy */
-       *size += sizeof(*buf) + arg_sz;
+       *size = sizeof(*buf) + arg_sz;
        return 0;
 }
 
diff --git a/drivers/accel/amdxdna/aie2_msg_priv.h 
b/drivers/accel/amdxdna/aie2_msg_priv.h
index 4e02e744b470..6df9065b13f6 100644
--- a/drivers/accel/amdxdna/aie2_msg_priv.h
+++ b/drivers/accel/amdxdna/aie2_msg_priv.h
@@ -319,18 +319,16 @@ struct async_event_msg_resp {
 } __packed;
 
 #define MAX_CHAIN_CMDBUF_SIZE SZ_4K
-#define slot_cf_has_space(offset, payload_size) \
-       (MAX_CHAIN_CMDBUF_SIZE - ((offset) + (payload_size)) > \
-        offsetof(struct cmd_chain_slot_execbuf_cf, args[0]))
+#define slot_has_space(slot, offset, payload_size)             \
+       (MAX_CHAIN_CMDBUF_SIZE >= (offset) + (payload_size) +   \
+        sizeof(typeof(slot)))
+
 struct cmd_chain_slot_execbuf_cf {
        __u32 cu_idx;
        __u32 arg_cnt;
        __u32 args[] __counted_by(arg_cnt);
 };
 
-#define slot_dpu_has_space(offset, payload_size) \
-       (MAX_CHAIN_CMDBUF_SIZE - ((offset) + (payload_size)) > \
-        offsetof(struct cmd_chain_slot_dpu, args[0]))
 struct cmd_chain_slot_dpu {
        __u64 inst_buf_addr;
        __u32 inst_size;
-- 
2.34.1