[PATCH 1/5] drm/i915: Move intel_engine_free_request_pool to i915_request.c

From: Jason Ekstrand <jason@jlekstrand.net>
To: dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org
Cc: Daniel Vetter <daniel.vetter@intel.com>,
	Jon Bloomfield <jon.bloomfield@intel.com>,
	Matthew Auld <matthew.auld@intel.com>,
	Jason Ekstrand <jason@jlekstrand.net>
Subject: [PATCH 1/5] drm/i915: Move intel_engine_free_request_pool to i915_request.c
Date: Wed,  9 Jun 2021 16:29:55 -0500	[thread overview]
Message-ID: <20210609212959.471209-2-jason@jlekstrand.net> (raw)
In-Reply-To: <20210609212959.471209-1-jason@jlekstrand.net>

This appears to break encapsulation by moving an intel_engine_cs
function to a i915_request file.  However, this function is
intrinsically tied to the lifetime rules and allocation scheme of
i915_request and having it in intel_engine_cs.c leaks details of
i915_request.  We have an abstraction leak either way.  Since
i915_request's allocation scheme is far more subtle than the simple
pointer that is intel_engine_cs.request_pool, it's probably better to
keep i915_request's details to itself.

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Cc: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/gt/intel_engine_cs.c | 8 --------
 drivers/gpu/drm/i915/i915_request.c       | 7 +++++--
 drivers/gpu/drm/i915/i915_request.h       | 2 --
 3 files changed, 5 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 9ceddfbb1687d..df6b80ec84199 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -422,14 +422,6 @@ void intel_engines_release(struct intel_gt *gt)
 	}
 }
 
-void intel_engine_free_request_pool(struct intel_engine_cs *engine)
-{
-	if (!engine->request_pool)
-		return;
-
-	kmem_cache_free(i915_request_slab_cache(), engine->request_pool);
-}
-
 void intel_engines_free(struct intel_gt *gt)
 {
 	struct intel_engine_cs *engine;
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 1014c71cf7f52..48c5f8527854b 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -106,9 +106,12 @@ static signed long i915_fence_wait(struct dma_fence *fence,
 				 timeout);
 }
 
-struct kmem_cache *i915_request_slab_cache(void)
+void intel_engine_free_request_pool(struct intel_engine_cs *engine)
 {
-	return global.slab_requests;
+	if (!engine->request_pool)
+		return;
+
+	kmem_cache_free(global.slab_requests, engine->request_pool);
 }
 
 static void i915_fence_release(struct dma_fence *fence)
diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h
index 270f6cd37650c..f84c38d29f988 100644
--- a/drivers/gpu/drm/i915/i915_request.h
+++ b/drivers/gpu/drm/i915/i915_request.h
@@ -300,8 +300,6 @@ static inline bool dma_fence_is_i915(const struct dma_fence *fence)
 	return fence->ops == &i915_fence_ops;
 }
 
-struct kmem_cache *i915_request_slab_cache(void);
-
 struct i915_request * __must_check
 __i915_request_create(struct intel_context *ce, gfp_t gfp);
 struct i915_request * __must_check
-- 
2.31.1

