linux-kernel - [PATCH 06/10] drm/qxl: add qxl_bo_kmap/qxl_bo

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Message-Id: <20210216113716.716996-7-kraxel@redhat.com>
Date:   Tue, 16 Feb 2021 12:37:12 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Gerd Hoffmann <kraxel@...hat.com>,
        Dave Airlie <airlied@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        virtualization@...ts.linux-foundation.org (open list:DRM DRIVER FOR QXL
        VIRTUAL GPU),
        spice-devel@...ts.freedesktop.org (open list:DRM DRIVER FOR QXL VIRTUAL
        GPU), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 06/10] drm/qxl: add qxl_bo_kmap/qxl_bo_kunmap

Add kmap/kunmap variants which reserve (and pin) the bo.
They can be used in case the caller doesn't hold a reservation
for the bo.

Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
---
 drivers/gpu/drm/qxl/qxl_object.h |  2 ++
 drivers/gpu/drm/qxl/qxl_object.c | 36 ++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/drivers/gpu/drm/qxl/qxl_object.h b/drivers/gpu/drm/qxl/qxl_object.h
index 5bd33650183f..360972ae4869 100644
--- a/drivers/gpu/drm/qxl/qxl_object.h
+++ b/drivers/gpu/drm/qxl/qxl_object.h
@@ -64,7 +64,9 @@ extern int qxl_bo_create(struct qxl_device *qdev,
 			 u32 priority,
 			 struct qxl_surface *surf,
 			 struct qxl_bo **bo_ptr);
+extern int qxl_bo_kmap(struct qxl_bo *bo, struct dma_buf_map *map);
 extern int qxl_bo_kmap_locked(struct qxl_bo *bo, struct dma_buf_map *map);
+extern int qxl_bo_kunmap(struct qxl_bo *bo);
 extern void qxl_bo_kunmap_locked(struct qxl_bo *bo);
 void *qxl_bo_kmap_atomic_page(struct qxl_device *qdev, struct qxl_bo *bo, int page_offset);
 void qxl_bo_kunmap_atomic_page(struct qxl_device *qdev, struct qxl_bo *bo, void *map);
diff --git a/drivers/gpu/drm/qxl/qxl_object.c b/drivers/gpu/drm/qxl/qxl_object.c
index b56d4dfc28cb..22748b9566af 100644
--- a/drivers/gpu/drm/qxl/qxl_object.c
+++ b/drivers/gpu/drm/qxl/qxl_object.c
@@ -29,6 +29,9 @@
 #include "qxl_drv.h"
 #include "qxl_object.h"
 
+static int __qxl_bo_pin(struct qxl_bo *bo);
+static void __qxl_bo_unpin(struct qxl_bo *bo);
+
 static void qxl_ttm_bo_destroy(struct ttm_buffer_object *tbo)
 {
 	struct qxl_bo *bo;
@@ -179,6 +182,25 @@ int qxl_bo_kmap_locked(struct qxl_bo *bo, struct dma_buf_map *map)
 	return 0;
 }
 
+int qxl_bo_kmap(struct qxl_bo *bo, struct dma_buf_map *map)
+{
+	int r;
+
+	r = qxl_bo_reserve(bo);
+	if (r)
+		return r;
+
+	r = __qxl_bo_pin(bo);
+	if (r) {
+		qxl_bo_unreserve(bo);
+		return r;
+	}
+
+	r = qxl_bo_kmap_locked(bo, map);
+	qxl_bo_unreserve(bo);
+	return r;
+}
+
 void *qxl_bo_kmap_atomic_page(struct qxl_device *qdev,
 			      struct qxl_bo *bo, int page_offset)
 {
@@ -223,6 +245,20 @@ void qxl_bo_kunmap_locked(struct qxl_bo *bo)
 	ttm_bo_vunmap(&bo->tbo, &bo->map);
 }
 
+int qxl_bo_kunmap(struct qxl_bo *bo)
+{
+	int r;
+
+	r = qxl_bo_reserve(bo);
+	if (r)
+		return r;
+
+	qxl_bo_kunmap_locked(bo);
+	__qxl_bo_unpin(bo);
+	qxl_bo_unreserve(bo);
+	return 0;
+}
+
 void qxl_bo_kunmap_atomic_page(struct qxl_device *qdev,
 			       struct qxl_bo *bo, void *pmap)
 {
-- 
2.29.2