linux-kernel - [PATCH 04/15] gma500: allow the creation of 'stolen' memory objects

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Date:	Fri, 15 Jul 2011 17:33:08 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	greg@...ah.com, linux-kernel@...r.kernel.org
Subject: [PATCH 04/15] gma500: allow the creation of 'stolen' memory objects

From: Alan Cox <alan@...ux.intel.com>

For things like cursors and many kinds of framebuffer set up we are actually
best using the stolen memory when possible.

Signed-off-by: Alan Cox <alan@...ux.intel.com>
---

 drivers/staging/gma500/gem.c     |   24 ++++++++++++++++++++++++
 drivers/staging/gma500/psb_drm.h |    3 ++-
 2 files changed, 26 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/gma500/gem.c b/drivers/staging/gma500/gem.c
index d7b74b6..65fdd6b 100644
--- a/drivers/staging/gma500/gem.c
+++ b/drivers/staging/gma500/gem.c
@@ -251,6 +251,21 @@ fail:
 	}
 }
 
+static int psb_gem_create_stolen(struct drm_file *file, struct drm_device *dev,
+						int size, u32 *handle)
+{
+	struct gtt_range *gtt = psb_gtt_alloc_range(dev, size, "gem", 1);
+	if (gtt == NULL)
+		return -ENOMEM;
+	if (drm_gem_private_object_init(dev, &gtt->gem, size) != 0)
+		goto free_gtt;
+	if (drm_gem_handle_create(file, &gtt->gem, handle) == 0)
+		return 0;
+free_gtt:
+	psb_gtt_free_range(dev, gtt);
+	return -ENOMEM;
+}
+
 /*
  *	GEM interfaces for our specific client
  */
@@ -258,6 +273,15 @@ int psb_gem_create_ioctl(struct drm_device *dev, void *data,
 					struct drm_file *file)
 {
 	struct drm_psb_gem_create *args = data;
+	int ret;
+	if (args->flags & PSB_GEM_CREATE_STOLEN) {
+		ret = psb_gem_create_stolen(file, dev, args->size,
+							&args->handle);
+		if (ret == 0)
+			return 0;
+		/* Fall throguh */
+		args->flags &= ~PSB_GEM_CREATE_STOLEN;
+	}
 	return psb_gem_create(file, dev, args->size, &args->handle);
 }
 
diff --git a/drivers/staging/gma500/psb_drm.h b/drivers/staging/gma500/psb_drm.h
index 70115a9..0da8468 100644
--- a/drivers/staging/gma500/psb_drm.h
+++ b/drivers/staging/gma500/psb_drm.h
@@ -189,7 +189,8 @@ struct psb_drm_dpu_rect {
 struct drm_psb_gem_create {
 	__u64 size;
 	__u32 handle;
-	__u32 pad;
+	__u32 flags;
+#define PSB_GEM_CREATE_STOLEN		1	/* Stolen memory can be used */
 };
 
 #define PSB_2D_OP_BUFLEN		16

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