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pan/cs: Add a LOAD_IP pseudo instruction

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Will be useful if we want to be able to make the trace events point to
the instruction they are recording.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Mary Guillemard <mary.guillemard@collabora.com>
Reviewed-by: Lars-Ivar Hesselberg Simonsen <lars-ivar.simonsen@arm.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32284>
This commit is contained in:
Boris Brezillon 2024-11-25 10:00:16 +01:00 • committed by Marge Bot
parent 8c30c2924f
commit 4e5f75d1d7
1 changed files with 54 additions and 1 deletions
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55
src/panfrost/lib/genxml/cs_builder.h
View file

@ -180,6 +180,7 @@ struct cs_builder {
struct cs_block *stack;
struct util_dynarray instrs;
struct cs_if_else pending_if;
unsigned last_load_ip_target;
} blocks;
/* Move immediate instruction at the end of the last CS chunk that needs to
@ -551,10 +552,39 @@ cs_flush_block_instrs(struct cs_builder *b)
if (!num_instrs)
return;
/* If LOAD_IP is the last instruction in the block, we reserve one more
* slot to make sure the next instruction won't point to a CS chunk linking
* sequence. */
if (unlikely(b->blocks.last_load_ip_target >= num_instrs)) {
if (!cs_reserve_instrs(b, num_instrs + 1))
return;
}
void *buffer = cs_alloc_ins_block(b, num_instrs);
if (likely(cs_is_valid(b)))
if (likely(cs_is_valid(b))) {
/* If we have a LOAD_IP chain, we need to patch each LOAD_IP
* instruction before we copy the block to the final memory
* region. */
while (unlikely(b->blocks.last_load_ip_target)) {
uint64_t *instr = util_dynarray_element(
&b->blocks.instrs, uint64_t, b->blocks.last_load_ip_target - 1);
unsigned prev_load_ip_target = *instr & BITFIELD_MASK(32);
uint64_t ip =
b->cur_chunk.buffer.gpu +
((b->cur_chunk.pos - num_instrs + b->blocks.last_load_ip_target) *
sizeof(uint64_t));
/* Drop the prev_load_ip_target value and replace it by the final
* IP. */
*instr &= ~BITFIELD64_MASK(32);
*instr |= ip;
b->blocks.last_load_ip_target = prev_load_ip_target;
}
memcpy(buffer, b->blocks.instrs.data, b->blocks.instrs.size);
}
util_dynarray_clear(&b->blocks.instrs);
}
@ -745,6 +775,29 @@ cs_move48_to(struct cs_builder *b, struct cs_index dest, uint64_t imm)
}
}
static inline void
cs_load_ip_to(struct cs_builder *b, struct cs_index dest)
{
/* If a load_ip instruction is emitted after an if_end(), it flushes the
* pending if, causing further cs_else_start() instructions to be invalid.
*/
cs_flush_pending_if(b);
if (likely(cs_cur_block(b) == NULL)) {
if (!cs_reserve_instrs(b, 2))
return;
/* We make IP point to the instruction right after our MOVE. */
uint64_t ip =
b->cur_chunk.buffer.gpu + (sizeof(uint64_t) * (b->cur_chunk.pos + 1));
cs_move48_to(b, dest, ip);
} else {
cs_move48_to(b, dest, b->blocks.last_load_ip_target);
b->blocks.last_load_ip_target =
util_dynarray_num_elements(&b->blocks.instrs, uint64_t);
}
}
static inline void
cs_block_start(struct cs_builder *b, struct cs_block *block)
{