[PATCH v2 6/8] drm/etnaviv: provide MMU context to etnaviv_gem_mapping_get

From: Lucas Stach <l.stach@pengutronix.de>
To: etnaviv@lists.freedesktop.org
Cc: patchwork-lst@pengutronix.de, kernel@pengutronix.de,
	dri-devel@lists.freedesktop.org,
	Russell King <linux+etnaviv@armlinux.org.uk>
Subject: [PATCH v2 6/8] drm/etnaviv: provide MMU context to etnaviv_gem_mapping_get
Date: Wed, 17 Apr 2019 15:50:21 +0200	[thread overview]
Message-ID: <20190417135023.26977-7-l.stach@pengutronix.de> (raw)
In-Reply-To: <20190417135023.26977-1-l.stach@pengutronix.de>

In preparation to having a context per process, etnaviv_gem_mapping_get
should not use the current GPU context, but needs to be told which
context to use.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
 drivers/gpu/drm/etnaviv/etnaviv_gem.c        | 20 ++++++++++++--------
 drivers/gpu/drm/etnaviv/etnaviv_gem.h        |  3 ++-
 drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c |  2 +-
 3 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
index 76c26d8f8d63..e4f07c9682f7 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -259,7 +259,8 @@ void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping)
 }
 
 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
-	struct drm_gem_object *obj, struct etnaviv_gpu *gpu)
+	struct drm_gem_object *obj, struct etnaviv_gpu *gpu,
+	struct etnaviv_iommu_context *mmu)
 {
 	struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 	struct etnaviv_vram_mapping *mapping;
@@ -267,7 +268,7 @@ struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
 	int ret = 0;
 
 	mutex_lock(&etnaviv_obj->lock);
-	mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, gpu->mmu);
+	mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, mmu);
 	if (mapping) {
 		/*
 		 * Holding the object lock prevents the use count changing
@@ -276,12 +277,12 @@ struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
 		 * the MMU owns this mapping to close this race.
 		 */
 		if (mapping->use == 0) {
-			mutex_lock(&gpu->mmu->lock);
-			if (mapping->context == gpu->mmu)
+			mutex_lock(&mmu->lock);
+			if (mapping->context == mmu)
 				mapping->use += 1;
 			else
 				mapping = NULL;
-			mutex_unlock(&gpu->mmu->lock);
+			mutex_unlock(&mmu->lock);
 			if (mapping)
 				goto out;
 		} else {
@@ -314,10 +315,11 @@ struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
 		list_del(&mapping->obj_node);
 	}
 
-	mapping->context = gpu->mmu;
+	etnaviv_iommu_context_get(mmu);
+	mapping->context = mmu;
 	mapping->use = 1;
 
-	ret = etnaviv_iommu_map_gem(gpu->mmu, etnaviv_obj, gpu->memory_base,
+	ret = etnaviv_iommu_map_gem(mmu, etnaviv_obj, gpu->memory_base,
 				    mapping);
 	if (ret < 0)
 		kfree(mapping);
@@ -540,8 +542,10 @@ void etnaviv_gem_free_object(struct drm_gem_object *obj)
 
 		WARN_ON(mapping->use);
 
-		if (context)
+		if (context) {
 			etnaviv_iommu_unmap_gem(context, mapping);
+			etnaviv_iommu_context_put(context);
+		}
 
 		list_del(&mapping->obj_node);
 		kfree(mapping);
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.h b/drivers/gpu/drm/etnaviv/etnaviv_gem.h
index cf94f0b24584..79a211f5ac5f 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.h
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.h
@@ -123,7 +123,8 @@ struct page **etnaviv_gem_get_pages(struct etnaviv_gem_object *obj);
 void etnaviv_gem_put_pages(struct etnaviv_gem_object *obj);
 
 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
-	struct drm_gem_object *obj, struct etnaviv_gpu *gpu);
+	struct drm_gem_object *obj, struct etnaviv_gpu *gpu,
+	struct etnaviv_iommu_context *mmu);
 void etnaviv_gem_mapping_reference(struct etnaviv_vram_mapping *mapping);
 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping);
 
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
index f5b3dfa312b7..9442196a3d51 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
@@ -229,7 +229,7 @@ static int submit_pin_objects(struct etnaviv_gem_submit *submit)
 		struct etnaviv_vram_mapping *mapping;
 
 		mapping = etnaviv_gem_mapping_get(&etnaviv_obj->base,
-						  submit->gpu);
+						  submit->gpu, submit->gpu->mmu);
 		if (IS_ERR(mapping)) {
 			ret = PTR_ERR(mapping);
 			break;
-- 
2.20.1

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