drm/i915: move request slabs to direct module init/exit

With the global kmem_cache shrink infrastructure gone there's nothing
special and we can convert them over.

I'm doing this split up into each patch because there's quite a bit of
noise with removing the static global.slab_requests|execute_cbs to just a
slab_requests|execute_cbs.

v2: Make slab static (Jason, 0day)

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Cc: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210727121037.2041102-7-daniel.vetter@ffwll.ch

drivers/gpu/drm/i915/i915_globals.c

@@ -8,7 +8,6 @@
 #include <linux/workqueue.h>
 
 #include "i915_globals.h"
-#include "i915_request.h"
 #include "i915_scheduler.h"
 #include "i915_vma.h"
 
@@ -30,7 +29,6 @@ static void __i915_globals_cleanup(void)
 }
 
 static __initconst int (* const initfn[])(void) = {
-	i915_global_request_init,
 	i915_global_scheduler_init,
 	i915_global_vma_init,
 };

drivers/gpu/drm/i915/i915_pci.c

@@ -35,6 +35,7 @@
 #include "i915_drv.h"
 #include "gem/i915_gem_context.h"
 #include "gem/i915_gem_object.h"
+#include "i915_request.h"
 #include "i915_perf.h"
 #include "i915_globals.h"
 #include "i915_selftest.h"
@@ -1268,6 +1269,7 @@ static const struct {
 	{ i915_context_module_init, i915_context_module_exit },
 	{ i915_gem_context_module_init, i915_gem_context_module_exit },
 	{ i915_objects_module_init, i915_objects_module_exit },
+	{ i915_request_module_init, i915_request_module_exit },
 	{ i915_globals_init, i915_globals_exit },
 	{ i915_mock_selftests, NULL },
 	{ i915_pmu_init, i915_pmu_exit },

drivers/gpu/drm/i915/i915_request.c

@@ -42,7 +42,6 @@
 
 #include "i915_active.h"
 #include "i915_drv.h"
-#include "i915_globals.h"
 #include "i915_trace.h"
 #include "intel_pm.h"
 
@@ -52,11 +51,8 @@ struct execute_cb {
 	struct i915_request *signal;
 };
 
-static struct i915_global_request {
-	struct i915_global base;
-	struct kmem_cache *slab_requests;
-	struct kmem_cache *slab_execute_cbs;
-} global;
+static struct kmem_cache *slab_requests;
+static struct kmem_cache *slab_execute_cbs;
 
 static const char *i915_fence_get_driver_name(struct dma_fence *fence)
 {
@@ -107,7 +103,7 @@ static signed long i915_fence_wait(struct dma_fence *fence,
 
 struct kmem_cache *i915_request_slab_cache(void)
 {
-	return global.slab_requests;
+	return slab_requests;
 }
 
 static void i915_fence_release(struct dma_fence *fence)
@@ -140,7 +136,7 @@ static void i915_fence_release(struct dma_fence *fence)
 
 	intel_context_put(rq->context);
 
-	kmem_cache_free(global.slab_requests, rq);
+	kmem_cache_free(slab_requests, rq);
 }
 
 const struct dma_fence_ops i915_fence_ops = {
@@ -157,7 +153,7 @@ static void irq_execute_cb(struct irq_work *wrk)
 	struct execute_cb *cb = container_of(wrk, typeof(*cb), work);
 
 	i915_sw_fence_complete(cb->fence);
-	kmem_cache_free(global.slab_execute_cbs, cb);
+	kmem_cache_free(slab_execute_cbs, cb);
 }
 
 static __always_inline void
@@ -462,7 +458,7 @@ __await_execution(struct i915_request *rq,
 	if (i915_request_is_active(signal))
 		return 0;
 
-	cb = kmem_cache_alloc(global.slab_execute_cbs, gfp);
+	cb = kmem_cache_alloc(slab_execute_cbs, gfp);
 	if (!cb)
 		return -ENOMEM;
 
@@ -808,7 +804,7 @@ request_alloc_slow(struct intel_timeline *tl,
 	rq = list_first_entry(&tl->requests, typeof(*rq), link);
 	i915_request_retire(rq);
 
-	rq = kmem_cache_alloc(global.slab_requests,
+	rq = kmem_cache_alloc(slab_requests,
 			      gfp | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
 	if (rq)
 		return rq;
@@ -821,7 +817,7 @@ request_alloc_slow(struct intel_timeline *tl,
 	retire_requests(tl);
 
 out:
-	return kmem_cache_alloc(global.slab_requests, gfp);
+	return kmem_cache_alloc(slab_requests, gfp);
 }
 
 static void __i915_request_ctor(void *arg)
@@ -882,7 +878,7 @@ __i915_request_create(struct intel_context *ce, gfp_t gfp)
 	 *
 	 * Do not use kmem_cache_zalloc() here!
 	 */
-	rq = kmem_cache_alloc(global.slab_requests,
+	rq = kmem_cache_alloc(slab_requests,
 			      gfp | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
 	if (unlikely(!rq)) {
 		rq = request_alloc_slow(tl, &ce->engine->request_pool, gfp);
@@ -984,7 +980,7 @@ __i915_request_create(struct intel_context *ce, gfp_t gfp)
 
 err_free:
 	intel_context_put(ce);
-	kmem_cache_free(global.slab_requests, rq);
+	kmem_cache_free(slab_requests, rq);
 err_unreserve:
 	intel_context_unpin(ce);
 	return ERR_PTR(ret);
@@ -2080,40 +2076,35 @@ enum i915_request_state i915_test_request_state(struct i915_request *rq)
 #include "selftests/i915_request.c"
 #endif
 
-static void i915_global_request_exit(void)
+void i915_request_module_exit(void)
 {
-	kmem_cache_destroy(global.slab_execute_cbs);
-	kmem_cache_destroy(global.slab_requests);
+	kmem_cache_destroy(slab_execute_cbs);
+	kmem_cache_destroy(slab_requests);
 }
 
-static struct i915_global_request global = { {
-	.exit = i915_global_request_exit,
-} };
-
-int __init i915_global_request_init(void)
+int __init i915_request_module_init(void)
 {
-	global.slab_requests =
+	slab_requests =
 		kmem_cache_create("i915_request",
 				  sizeof(struct i915_request),
 				  __alignof__(struct i915_request),
 				  SLAB_HWCACHE_ALIGN |
 				  SLAB_RECLAIM_ACCOUNT |
 				  SLAB_TYPESAFE_BY_RCU,
 				  __i915_request_ctor);
-	if (!global.slab_requests)
+	if (!slab_requests)
 		return -ENOMEM;
 
-	global.slab_execute_cbs = KMEM_CACHE(execute_cb,
+	slab_execute_cbs = KMEM_CACHE(execute_cb,
 					     SLAB_HWCACHE_ALIGN |
 					     SLAB_RECLAIM_ACCOUNT |
 					     SLAB_TYPESAFE_BY_RCU);
-	if (!global.slab_execute_cbs)
+	if (!slab_execute_cbs)
 		goto err_requests;
 
-	i915_global_register(&global.base);
 	return 0;
 
 err_requests:
-	kmem_cache_destroy(global.slab_requests);
+	kmem_cache_destroy(slab_requests);
 	return -ENOMEM;
 }

drivers/gpu/drm/i915/i915_request.h

@@ -668,4 +668,7 @@ enum i915_request_state {
 
 enum i915_request_state i915_test_request_state(struct i915_request *rq);
 
+void i915_request_module_exit(void);
+int i915_request_module_init(void);
+
 #endif /* I915_REQUEST_H */