From e6364d70cfa3205233c131ae65f1aade8c8a050f Mon Sep 17 00:00:00 2001
From: Lucas Stach <l.stach@pengutronix.de>
Date: Fri, 5 Jul 2019 19:17:26 +0200
Subject: drm/etnaviv: provide MMU context to etnaviv_gem_mapping_get
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Git-commit: e6364d70cfa3205233c131ae65f1aade8c8a050f
Patch-mainline: v5.4-rc1
References: bsc#1152489

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>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Guido Günther <agx@sigxcpu.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/etnaviv/etnaviv_gem.c        | 28 ++++++++++++--------
 drivers/gpu/drm/etnaviv/etnaviv_gem.h        |  3 ++-
 drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c |  3 ++-
 3 files changed, 21 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
index 0ccc3c4dffc4..b7140073c62e 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -248,7 +248,8 @@ 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_context)
 {
 	struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 	struct etnaviv_vram_mapping *mapping;
@@ -256,7 +257,7 @@ 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_context);
+	mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, mmu_context);
 	if (mapping) {
 		/*
 		 * Holding the object lock prevents the use count changing
@@ -265,12 +266,12 @@ 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_context->lock);
-			if (mapping->context == gpu->mmu_context)
+			mutex_lock(&mmu_context->lock);
+			if (mapping->context == mmu_context)
 				mapping->use += 1;
 			else
 				mapping = NULL;
-			mutex_unlock(&gpu->mmu_context->lock);
+			mutex_unlock(&mmu_context->lock);
 			if (mapping)
 				goto out;
 		} else {
@@ -303,15 +304,18 @@ struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
 		list_del(&mapping->obj_node);
 	}
 
-	mapping->context = gpu->mmu_context;
+	etnaviv_iommu_context_get(mmu_context);
+	mapping->context = mmu_context;
 	mapping->use = 1;
 
-	ret = etnaviv_iommu_map_gem(gpu->mmu_context, etnaviv_obj,
-				    gpu->memory_base, mapping);
-	if (ret < 0)
+	ret = etnaviv_iommu_map_gem(mmu_context, etnaviv_obj, gpu->memory_base,
+				    mapping);
+	if (ret < 0) {
+		etnaviv_iommu_context_put(mmu_context);
 		kfree(mapping);
-	else
+	} else {
 		list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
+	}
 
 out:
 	mutex_unlock(&etnaviv_obj->lock);
@@ -529,8 +533,10 @@ 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 5a004d5e4eaa..f342560b5938 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.h
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.h
@@ -119,7 +119,8 @@ 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_context);
 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping);
 
 #endif /* __ETNAVIV_GEM_H__ */
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
index 3f4f6ab388de..7929d258daf8 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
@@ -224,7 +224,8 @@ 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_context);
 		if (IS_ERR(mapping)) {
 			ret = PTR_ERR(mapping);
 			break;
-- 
2.28.0