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Date: Thu, 1 Sep 2016 15:40:44 -0700
From: Laura Abbott <labbott@...hat.com>
To: Sumit Semwal <sumit.semwal@...aro.org>,
John Stultz <john.stultz@...aro.org>,
Arve Hjønnevåg <arve@...roid.com>,
Riley Andrews <riandrews@...roid.com>
Cc: Laura Abbott <labbott@...hat.com>,
Daniel Vetter <daniel.vetter@...ll.ch>,
linaro-mm-sig@...ts.linaro.org, devel@...verdev.osuosl.org,
linux-kernel@...r.kernel.org,
Eun Taik Lee <eun.taik.lee@...sung.com>,
Liviu Dudau <Liviu.Dudau@....com>,
Jon Medhurst <tixy@...aro.org>,
Mitchel Humpherys <mitchelh@...eaurora.org>,
Jeremy Gebben <jgebben@...eaurora.org>,
Bryan Huntsman <bryanh@...eaurora.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Android Kernel Team <kernel-team@...roid.com>,
Chen Feng <puck.chen@...ilicon.com>,
Brian Starkey <brian.starkey@....com>
Subject: [PATCHv2 4/4] staging: android: ion: Add ioctl to query available heaps
Ion clients currently lack a good method to determine what
heaps are available and what ids they map to. This leads
to tight coupling between user and kernel space and headaches.
Add a query ioctl to let userspace know the availability of
heaps.
Signed-off-by: Laura Abbott <labbott@...hat.com>
---
drivers/staging/android/ion/ion-ioctl.c | 11 +++++++++
drivers/staging/android/ion/ion.c | 44 +++++++++++++++++++++++++++++++++
drivers/staging/android/ion/ion_priv.h | 3 +++
drivers/staging/android/uapi/ion.h | 39 +++++++++++++++++++++++++++++
4 files changed, 97 insertions(+)
diff --git a/drivers/staging/android/ion/ion-ioctl.c b/drivers/staging/android/ion/ion-ioctl.c
index 53b9520..e76d517 100644
--- a/drivers/staging/android/ion/ion-ioctl.c
+++ b/drivers/staging/android/ion/ion-ioctl.c
@@ -28,6 +28,7 @@ union ion_ioctl_arg {
struct ion_handle_data handle;
struct ion_custom_data custom;
struct ion_abi_version abi_version;
+ struct ion_heap_query query;
};
static int validate_ioctl_arg(unsigned int cmd, union ion_ioctl_arg *arg)
@@ -38,6 +39,11 @@ static int validate_ioctl_arg(unsigned int cmd, union ion_ioctl_arg *arg)
case ION_IOC_ABI_VERSION:
ret = arg->abi_version.reserved != 0;
break;
+ case ION_IOC_HEAP_QUERY:
+ ret = arg->query.reserved0 != 0;
+ ret |= arg->query.reserved1 != 0;
+ ret |= arg->query.reserved2 != 0;
+ break;
default:
break;
}
@@ -162,6 +168,11 @@ long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
data.abi_version.abi_version = ION_ABI_VERSION;
break;
}
+ case ION_IOC_HEAP_QUERY:
+ {
+ ret = ion_query_heaps(client, &data.query);
+ break;
+ }
default:
return -ENOTTY;
}
diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index 975b48f..91b765c 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -1174,6 +1174,49 @@ int ion_sync_for_device(struct ion_client *client, int fd)
return 0;
}
+int ion_query_heaps(struct ion_client *client, struct ion_heap_query *query)
+{
+ struct ion_device *dev = client->dev;
+ struct ion_heap_data __user *buffer =
+ (struct ion_heap_data __user *)query->heaps;
+ int ret = -EINVAL, cnt = 0, max_cnt;
+ struct ion_heap *heap;
+ struct ion_heap_data hdata;
+
+ memset(&hdata, 0, sizeof(hdata));
+
+ down_read(&dev->lock);
+ if (!buffer) {
+ query->cnt = dev->heap_cnt;
+ ret = 0;
+ goto out;
+ }
+
+ if (query->cnt <= 0)
+ goto out;
+
+ max_cnt = query->cnt;
+
+ plist_for_each_entry(heap, &dev->heaps, node) {
+ strncpy(hdata.name, heap->name, MAX_HEAP_NAME);
+ hdata.name[sizeof(hdata.name) - 1] = '\0';
+ hdata.type = heap->type;
+ hdata.heap_id = heap->id;
+
+ ret = copy_to_user(&buffer[cnt],
+ &hdata, sizeof(hdata));
+
+ cnt++;
+ if (cnt >= max_cnt)
+ break;
+ }
+
+ query->cnt = cnt;
+out:
+ up_read(&dev->lock);
+ return ret;
+}
+
static int ion_release(struct inode *inode, struct file *file)
{
struct ion_client *client = file->private_data;
@@ -1391,6 +1434,7 @@ void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
}
}
+ dev->heap_cnt++;
up_write(&dev->lock);
}
EXPORT_SYMBOL(ion_device_add_heap);
diff --git a/drivers/staging/android/ion/ion_priv.h b/drivers/staging/android/ion/ion_priv.h
index 95df6a9..0d0c0aa 100644
--- a/drivers/staging/android/ion/ion_priv.h
+++ b/drivers/staging/android/ion/ion_priv.h
@@ -104,6 +104,7 @@ struct ion_device {
struct dentry *debug_root;
struct dentry *heaps_debug_root;
struct dentry *clients_debug_root;
+ int heap_cnt;
};
/**
@@ -469,4 +470,6 @@ struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
int ion_handle_put(struct ion_handle *handle);
+int ion_query_heaps(struct ion_client *client, struct ion_heap_query *query);
+
#endif /* _ION_PRIV_H */
diff --git a/drivers/staging/android/uapi/ion.h b/drivers/staging/android/uapi/ion.h
index 7ca4e8b..112f257 100644
--- a/drivers/staging/android/uapi/ion.h
+++ b/drivers/staging/android/uapi/ion.h
@@ -137,11 +137,41 @@ struct ion_custom_data {
#define ION_ABI_VERSION KERNEL_VERSION(0, 1, 0)
+#define MAX_HEAP_NAME 32
+
struct ion_abi_version {
__u32 abi_version;
__u32 reserved;
};
+/**
+ * struct ion_heap_data - data about a heap
+ * @name - first 32 characters of the heap name
+ * @type - heap type
+ * @heap_id - heap id for the heap
+ */
+struct ion_heap_data {
+ char name[MAX_HEAP_NAME];
+ __u32 type;
+ __u32 heap_id;
+ __u32 reserved0;
+ __u32 reserved1;
+ __u32 reserved2;
+};
+
+/**
+ * struct ion_heap_query - collection of data about all heaps
+ * @cnt - total number of heaps to be copied
+ * @heaps - buffer to copy heap data
+ */
+struct ion_heap_query {
+ __u32 cnt; /* Total number of heaps to be copied */
+ __u32 reserved0; /* align to 64bits */
+ __u64 heaps; /* buffer to be populated */
+ __u32 reserved1;
+ __u32 reserved2;
+};
+
#define ION_IOC_MAGIC 'I'
/**
@@ -216,4 +246,13 @@ struct ion_abi_version {
#define ION_IOC_ABI_VERSION _IOR(ION_IOC_MAGIC, 8, \
struct ion_abi_version)
+/**
+ * DOC: ION_IOC_HEAP_QUERY - information about available heaps
+ *
+ * Takes an ion_heap_query structure and populates information about
+ * available Ion heaps.
+ */
+#define ION_IOC_HEAP_QUERY _IOWR(ION_IOC_MAGIC, 12, \
+ struct ion_heap_query)
+
#endif /* _UAPI_LINUX_ION_H */
--
2.7.4
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