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intel/decoder: Use 'DWord Length' and 'bias' fields for packet length.

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Use the 'DWord Length' and 'bias' fields from the instruction definition to
parse the packet length from the command stream when possible. The hardcoded
mechanism is used whenever an instruction doesn't have this field.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
This commit is contained in:
Toni Lönnberg 2018-10-29 13:56:44 +02:00 • committed by Lionel Landwerlin
parent a09cbaffbf
commit d5a938c58d
2 changed files with 25 additions and 7 deletions
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30
src/intel/common/gen_decoder.c
View file

@ -163,11 +163,16 @@ create_group(struct parser_context *ctx,
group->spec = ctx->spec;
group->variable = false;
group->fixed_length = fixed_length;
group->dword_length_field = NULL;
group->dw_length = 0;
group->bias = 1;
for (int i = 0; atts[i]; i += 2) {
char *p;
if (strcmp(atts[i], "length") == 0) {
group->dw_length = strtoul(atts[i + 1], &p, 0);
} else if (strcmp(atts[i], "bias") == 0) {
group->bias = strtoul(atts[i + 1], &p, 0);
}
}
@ -288,15 +293,18 @@ create_field(struct parser_context *ctx, const char **atts)
for (int i = 0; atts[i]; i += 2) {
char *p;
if (strcmp(atts[i], "name") == 0)
if (strcmp(atts[i], "name") == 0) {
field->name = ralloc_strdup(field, atts[i + 1]);
else if (strcmp(atts[i], "start") == 0)
if (strcmp(field->name, "DWord Length") == 0) {
field->parent->dword_length_field = field;
}
} else if (strcmp(atts[i], "start") == 0) {
field->start = strtoul(atts[i + 1], &p, 0);
else if (strcmp(atts[i], "end") == 0) {
} else if (strcmp(atts[i], "end") == 0) {
field->end = strtoul(atts[i + 1], &p, 0);
} else if (strcmp(atts[i], "type") == 0)
} else if (strcmp(atts[i], "type") == 0) {
field->type = string_to_type(ctx, atts[i + 1]);
else if (strcmp(atts[i], "default") == 0 &&
} else if (strcmp(atts[i], "default") == 0 &&
field->start >= 16 && field->end <= 31) {
field->has_default = true;
field->default_value = strtoul(atts[i + 1], &p, 0);
@ -741,8 +749,16 @@ gen_group_find_field(struct gen_group *group, const char *name)
int
gen_group_get_length(struct gen_group *group, const uint32_t *p)
{
if (group && group->fixed_length)
return group->dw_length;
if (group) {
if (group->fixed_length)
return group->dw_length;
else {
struct gen_field *field = group->dword_length_field;
if (field) {
return field_value(p[0], field->start, field->end) + group->bias;
}
}
}
uint32_t h = p[0];
uint32_t type = field_value(h, 29, 31);

2
src/intel/common/gen_decoder.h
View file

@ -99,8 +99,10 @@ struct gen_group {
char *name;
struct gen_field *fields; /* linked list of fields */
struct gen_field *dword_length_field; /* <instruction> specific */
uint32_t dw_length;
uint32_t bias; /* <instruction> specific */
uint32_t group_offset, group_count;
uint32_t group_size;
bool variable; /* <group> specific */