[Intel-gfx] [PATCH 5/8] drm/i915/guc: Move lrc desc setup to where it is needed

John.C.Harrison
2022-02-17T23:52:11Z

From: John Harrison <John.C.Harrison@Intel.com>

The LRC descriptor was being initialised early on in the context
registration sequence. It could then be determined that the actual
registration needs to be delayed and the descriptor would be wiped
out. This is inefficient, so move the setup to later in the process
after the point of no return.

Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
---
drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index 0ab2d1a24bf6..aa74ec74194a 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -2153,6 +2153,8 @@ static int __guc_action_register_context(struct intel_guc *guc,
0, loop);
}

+static void prepare_context_registration_info(struct intel_context *ce);
+
static int register_context(struct intel_context *ce, bool loop)
{
struct intel_guc *guc = ce_to_guc(ce);
@@ -2163,6 +2165,8 @@ static int register_context(struct intel_context *ce, bool loop)
GEM_BUG_ON(intel_context_is_child(ce));
trace_intel_context_register(ce);

+ prepare_context_registration_info(ce);
+
if (intel_context_is_parent(ce))
ret = __guc_action_register_multi_lrc(guc, ce, ce->guc_id.id,
offset, loop);
@@ -2246,7 +2250,6 @@ static void prepare_context_registration_info(struct intel_context *ce)
struct intel_context *child;

GEM_BUG_ON(!engine->mask);
- GEM_BUG_ON(!sched_state_is_init(ce));

/*
* Ensure LRC + CT vmas are is same region as write barrier is done
@@ -2314,9 +2317,13 @@ static int try_context_registration(struct intel_context *ce, bool loop)
bool context_registered;
int ret = 0;

+ GEM_BUG_ON(!sched_state_is_init(ce));
+
context_registered = ctx_id_mapped(guc, desc_idx);

- prepare_context_registration_info(ce);
+ if (context_registered)
+ clr_ctx_id_mapping(guc, desc_idx);
+ set_ctx_id_mapping(guc, desc_idx, ce);

/*
* The context_lookup xarray is used to determine if the hardware
--
2.25.1