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drm/i915/gvt: Utility for valid command length check

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Add utility for valid command length check.

v2: Add F_VAL_CONST flag to identify the value is const
    although LEN maybe variable. (Zhenyu)
v3: unused code removal, flag rename/conflict. (Zhenyu)
v4: redefine F_IP_ADVANCE_CUSTOM and move the check function to
    next patch. (Zhenyu)

Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Gao, Fred <fred.gao@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Gao, Fred 2019-07-18 09:39:01 +08:00 committed by Zhenyu Wang
parent 8cfbca7848
commit 4f870f1fba
1 changed files with 9 additions and 6 deletions
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15
drivers/gpu/drm/i915/gvt/cmd_parser.c
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@ -378,17 +378,17 @@ struct cmd_info {
const char *name;
u32 opcode;
#define F_LEN_MASK (1U<<0)
#define F_LEN_MASK 3U
#define F_LEN_CONST 1U
#define F_LEN_VAR 0U
/* value is const although LEN maybe variable */
#define F_LEN_VAR_FIXED (1<<1)
/*
* command has its own ip advance logic
* e.g. MI_BATCH_START, MI_BATCH_END
*/
#define F_IP_ADVANCE_CUSTOM (1<<1)
#define F_POST_HANDLE (1<<2)
#define F_IP_ADVANCE_CUSTOM (1<<2)
u32 flag;
#define R_RCS BIT(RCS0)
@ -418,9 +418,12 @@ struct cmd_info {
* flag == F_LEN_VAR : length bias bits
* Note: length is in DWord
*/
u8 len;
u32 len;
parser_cmd_handler handler;
/* valid length in DWord */
u32 valid_len;
};
struct cmd_entry {
@ -1912,7 +1915,7 @@ static const struct cmd_info cmd_info[] = {
{"MI_RS_CONTEXT", OP_MI_RS_CONTEXT, F_LEN_CONST, R_RCS, D_ALL, 0, 1,
NULL},
{"MI_DISPLAY_FLIP", OP_MI_DISPLAY_FLIP, F_LEN_VAR | F_POST_HANDLE,
{"MI_DISPLAY_FLIP", OP_MI_DISPLAY_FLIP, F_LEN_VAR,
R_RCS | R_BCS, D_ALL, 0, 8, cmd_handler_mi_display_flip},
{"MI_SEMAPHORE_MBOX", OP_MI_SEMAPHORE_MBOX, F_LEN_VAR, R_ALL, D_ALL,