linux-kernel - [PATCH 004/115] ion: Add reserve function to ion

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Date:	Fri, 13 Dec 2013 14:23:38 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Android Kernel Team <kernel-team@...roid.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Jesse Barker <jesse.barker@....com>,
	Colin Cross <ccross@...roid.com>,
	Rebecca Schultz Zavin <rebecca@...roid.com>,
	John Stultz <john.stultz@...aro.org>
Subject: [PATCH 004/115] ion: Add reserve function to ion

From: Rebecca Schultz Zavin <rebecca@...roid.com>

Rather than requiring each platform call memblock_remove or reserve
from the board file, add this to ion

Signed-off-by: Rebecca Schultz Zavin <rebecca@...roid.com>
[jstultz: modified patch to apply to staging directory]
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 drivers/staging/android/ion/ion.c | 17 +++++++++++++++++
 drivers/staging/android/ion/ion.h | 11 +++++++++++
 2 files changed, 28 insertions(+)

diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index bca8d9e..004c0d4 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -19,6 +19,7 @@
 #include <linux/fs.h>
 #include <linux/anon_inodes.h>
 #include <linux/list.h>
+#include <linux/memblock.h>
 #include <linux/miscdevice.h>
 #include <linux/export.h>
 #include <linux/mm.h>
@@ -1185,3 +1186,19 @@ void ion_device_destroy(struct ion_device *dev)
 	/* XXX need to free the heaps and clients ? */
 	kfree(dev);
 }
+
+void __init ion_reserve(struct ion_platform_data *data)
+{
+	int i, ret;
+
+	for (i = 0; i < data->nr; i++) {
+		if (data->heaps[i].size == 0)
+			continue;
+		ret = memblock_reserve(data->heaps[i].base,
+				       data->heaps[i].size);
+		if (ret)
+			pr_err("memblock reserve of %x@%lx failed\n",
+			       data->heaps[i].size,
+			       data->heaps[i].base);
+	}
+}
diff --git a/drivers/staging/android/ion/ion.h b/drivers/staging/android/ion/ion.h
index 87f6a45..4e012b8 100644
--- a/drivers/staging/android/ion/ion.h
+++ b/drivers/staging/android/ion/ion.h
@@ -87,6 +87,17 @@ struct ion_platform_data {
 };
 
 /**
+ * ion_reserve() - reserve memory for ion heaps if applicable
+ * @data:	platform data specifying starting physical address and
+ *		size
+ *
+ * Calls memblock reserve to set aside memory for heaps that are
+ * located at specific memory addresses or of specfic sizes not
+ * managed by the kernel
+ */
+void ion_reserve(struct ion_platform_data *data);
+
+/**
  * ion_client_create() -  allocate a client and returns it
  * @dev:	the global ion device
  * @heap_mask:	mask of heaps this client can allocate from
-- 
1.8.3.2

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