linux-kernel - [PATCH v2 04/22] drm/msm/gem: Add some

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Message-Id: <20201012020958.229288-5-robdclark@gmail.com>
Date:   Sun, 11 Oct 2020 19:09:31 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Daniel Vetter <daniel@...ll.ch>,
        Rob Clark <robdclark@...omium.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        linux-arm-msm@...r.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU),
        freedreno@...ts.freedesktop.org (open list:DRM DRIVER FOR MSM ADRENO
        GPU), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 04/22] drm/msm/gem: Add some _locked() helpers

From: Rob Clark <robdclark@...omium.org>

When we cut-over to using dma_resv_lock/etc instead of msm_obj->lock,
we'll need these for the submit path (where resv->lock is already held).

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/msm/msm_gem.c | 50 +++++++++++++++++++++++++++--------
 drivers/gpu/drm/msm/msm_gem.h |  4 +++
 2 files changed, 43 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index dec89fe79025..7bca2e815933 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -435,18 +435,14 @@ static int msm_gem_pin_iova(struct drm_gem_object *obj,
 			msm_obj->sgt, obj->size >> PAGE_SHIFT);
 }
 
-/*
- * get iova and pin it. Should have a matching put
- * limits iova to specified range (in pages)
- */
-int msm_gem_get_and_pin_iova_range(struct drm_gem_object *obj,
+static int get_and_pin_iova_range_locked(struct drm_gem_object *obj,
 		struct msm_gem_address_space *aspace, uint64_t *iova,
 		u64 range_start, u64 range_end)
 {
 	u64 local;
 	int ret;
 
-	msm_gem_lock(obj);
+	WARN_ON(!msm_gem_is_locked(obj));
 
 	ret = get_iova_locked(obj, aspace, &local,
 		range_start, range_end);
@@ -457,10 +453,32 @@ int msm_gem_get_and_pin_iova_range(struct drm_gem_object *obj,
 	if (!ret)
 		*iova = local;
 
+	return ret;
+}
+
+/*
+ * get iova and pin it. Should have a matching put
+ * limits iova to specified range (in pages)
+ */
+int msm_gem_get_and_pin_iova_range(struct drm_gem_object *obj,
+		struct msm_gem_address_space *aspace, uint64_t *iova,
+		u64 range_start, u64 range_end)
+{
+	int ret;
+
+	msm_gem_lock(obj);
+	ret = get_and_pin_iova_range_locked(obj, aspace, iova, range_start, range_end);
 	msm_gem_unlock(obj);
+
 	return ret;
 }
 
+int msm_gem_get_and_pin_iova_locked(struct drm_gem_object *obj,
+		struct msm_gem_address_space *aspace, uint64_t *iova)
+{
+	return get_and_pin_iova_range_locked(obj, aspace, iova, 0, U64_MAX);
+}
+
 /* get iova and pin it. Should have a matching put */
 int msm_gem_get_and_pin_iova(struct drm_gem_object *obj,
 		struct msm_gem_address_space *aspace, uint64_t *iova)
@@ -501,21 +519,31 @@ uint64_t msm_gem_iova(struct drm_gem_object *obj,
 }
 
 /*
- * Unpin a iova by updating the reference counts. The memory isn't actually
- * purged until something else (shrinker, mm_notifier, destroy, etc) decides
- * to get rid of it
+ * Locked variant of msm_gem_unpin_iova()
  */
-void msm_gem_unpin_iova(struct drm_gem_object *obj,
+void msm_gem_unpin_iova_locked(struct drm_gem_object *obj,
 		struct msm_gem_address_space *aspace)
 {
 	struct msm_gem_vma *vma;
 
-	msm_gem_lock(obj);
+	WARN_ON(!msm_gem_is_locked(obj));
+
 	vma = lookup_vma(obj, aspace);
 
 	if (!WARN_ON(!vma))
 		msm_gem_unmap_vma(aspace, vma);
+}
 
+/*
+ * Unpin a iova by updating the reference counts. The memory isn't actually
+ * purged until something else (shrinker, mm_notifier, destroy, etc) decides
+ * to get rid of it
+ */
+void msm_gem_unpin_iova(struct drm_gem_object *obj,
+		struct msm_gem_address_space *aspace)
+{
+	msm_gem_lock(obj);
+	msm_gem_unpin_iova_locked(obj, aspace);
 	msm_gem_unlock(obj);
 }
 
diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
index fbad08badf43..016f616dd118 100644
--- a/drivers/gpu/drm/msm/msm_gem.h
+++ b/drivers/gpu/drm/msm/msm_gem.h
@@ -103,10 +103,14 @@ int msm_gem_get_iova(struct drm_gem_object *obj,
 int msm_gem_get_and_pin_iova_range(struct drm_gem_object *obj,
 		struct msm_gem_address_space *aspace, uint64_t *iova,
 		u64 range_start, u64 range_end);
+int msm_gem_get_and_pin_iova_locked(struct drm_gem_object *obj,
+		struct msm_gem_address_space *aspace, uint64_t *iova);
 int msm_gem_get_and_pin_iova(struct drm_gem_object *obj,
 		struct msm_gem_address_space *aspace, uint64_t *iova);
 uint64_t msm_gem_iova(struct drm_gem_object *obj,
 		struct msm_gem_address_space *aspace);
+void msm_gem_unpin_iova_locked(struct drm_gem_object *obj,
+		struct msm_gem_address_space *aspace);
 void msm_gem_unpin_iova(struct drm_gem_object *obj,
 		struct msm_gem_address_space *aspace);
 struct page **msm_gem_get_pages(struct drm_gem_object *obj);
-- 
2.26.2