All of lore.kernel.org
 help / color / mirror / Atom feed
* [PATCH] drm/i915/gt: Only swap to a random sibling once upon creation
@ 2020-07-13 16:05 ` Chris Wilson
  0 siblings, 0 replies; 6+ messages in thread
From: Chris Wilson @ 2020-07-13 16:05 UTC (permalink / raw)
  To: intel-gfx; +Cc: Chris Wilson, Tvrtko Ursulin, stable

The danger in switching at random upon intel_context_pin is that the
context may still actually be inflight, as it will not be scheduled out
until a context switch after it is complete -- that is after we do a
final intel_context_unpin.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2118
Fixes: 6d06779e8672 ("drm/i915: Load balancing across a virtual engine")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: <stable@vger.kernel.org> # v5.3+
---
 drivers/gpu/drm/i915/gt/intel_lrc.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index cd4262cc96e2..f4658849b08a 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -5435,13 +5435,8 @@ static void virtual_engine_initial_hint(struct virtual_engine *ve)
 	 * typically be the first we inspect for submission.
 	 */
 	swp = prandom_u32_max(ve->num_siblings);
-	if (!swp)
-		return;
-
-	swap(ve->siblings[swp], ve->siblings[0]);
-	if (!intel_engine_has_relative_mmio(ve->siblings[0]))
-		virtual_update_register_offsets(ve->context.lrc_reg_state,
-						ve->siblings[0]);
+	if (swp)
+		swap(ve->siblings[swp], ve->siblings[0]);
 }
 
 static int virtual_context_alloc(struct intel_context *ce)
@@ -5454,15 +5449,9 @@ static int virtual_context_alloc(struct intel_context *ce)
 static int virtual_context_pin(struct intel_context *ce)
 {
 	struct virtual_engine *ve = container_of(ce, typeof(*ve), context);
-	int err;
 
 	/* Note: we must use a real engine class for setting up reg state */
-	err = __execlists_context_pin(ce, ve->siblings[0]);
-	if (err)
-		return err;
-
-	virtual_engine_initial_hint(ve);
-	return 0;
+	return __execlists_context_pin(ce, ve->siblings[0]);
 }
 
 static void virtual_context_enter(struct intel_context *ce)
@@ -5808,6 +5797,7 @@ intel_execlists_create_virtual(struct intel_engine_cs **siblings,
 
 	ve->base.flags |= I915_ENGINE_IS_VIRTUAL;
 
+	virtual_engine_initial_hint(ve);
 	return &ve->context;
 
 err_put:
-- 
2.20.1


^ permalink raw reply related	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2020-07-13 18:01 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-13 16:05 [PATCH] drm/i915/gt: Only swap to a random sibling once upon creation Chris Wilson
2020-07-13 16:05 ` [Intel-gfx] " Chris Wilson
2020-07-13 16:14 ` Tvrtko Ursulin
2020-07-13 16:14   ` Tvrtko Ursulin
2020-07-13 16:38 ` [Intel-gfx] ✓ Fi.CI.BAT: success for " Patchwork
2020-07-13 18:01 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.