sync: add ioctl to get fence data

Change-Id: I71410aef7e03a52562f7cb15b993ac8441b1fa12
Signed-off-by: Erik Gilling <konkers@android.com>

diff --git a/drivers/base/sync.c b/drivers/base/sync.c
index 49fcfc488c959d297dabafdcff05bceb2e75e592..2abb3d3ff1e06ab92adcac7e03428dd6f0af0078 100644 (file)
--- a/drivers/base/sync.c
+++ b/drivers/base/sync.c
@@ -551,6 +551,85 @@ err_put_fd:
        return err;
 }
 
+int sync_fill_pt_info(struct sync_pt *pt, void *data, int size)
+{
+       struct sync_pt_info *info = data;
+       int ret;
+
+       if (size < sizeof(struct sync_pt_info))
+               return -ENOMEM;
+
+       info->len = sizeof(struct sync_pt_info);
+
+       if (pt->parent->ops->fill_driver_data) {
+               ret = pt->parent->ops->fill_driver_data(pt, info->driver_data,
+                                                       size - sizeof(*info));
+               if (ret < 0)
+                       return ret;
+
+               info->len += ret;
+       }
+
+       strlcpy(info->obj_name, pt->parent->name, sizeof(info->obj_name));
+       strlcpy(info->driver_name, pt->parent->ops->driver_name,
+               sizeof(info->driver_name));
+       info->status = pt->status;
+       info->timestamp_ns = ktime_to_ns(pt->timestamp);
+
+       return info->len;
+}
+
+
+static long sync_fence_ioctl_fence_info(struct sync_fence *fence,
+                                       unsigned long arg)
+{
+       struct sync_fence_info_data *data;
+       struct list_head *pos;
+       __u32 size;
+       __u32 len = 0;
+       int ret;
+
+       if (copy_from_user(&size, (void __user *)arg, sizeof(size)))
+               return -EFAULT;
+
+       if (size < sizeof(struct sync_fence_info_data))
+               return -EINVAL;
+
+       if (size > 4096)
+               size = 4096;
+
+       data = kzalloc(size, GFP_KERNEL);
+       if (data == NULL)
+               return -ENOMEM;
+
+       strlcpy(data->name, fence->name, sizeof(data->name));
+       data->status = fence->status;
+       len = sizeof(struct sync_fence_info_data);
+
+       list_for_each(pos, &fence->pt_list_head) {
+               struct sync_pt *pt =
+                       container_of(pos, struct sync_pt, pt_list);
+
+               ret = sync_fill_pt_info(pt, (u8 *)data + len, size - len);
+
+               if (ret < 0)
+                       goto out;
+
+               len += ret;
+       }
+
+       data->len = len;
+
+       if (copy_to_user((void __user *)arg, data, len))
+               ret = -EFAULT;
+       else
+               ret = 0;
+
+out:
+       kfree(data);
+
+       return ret;
+}
 
 static long sync_fence_ioctl(struct file *file, unsigned int cmd,
                             unsigned long arg)
@@ -563,6 +642,9 @@ static long sync_fence_ioctl(struct file *file, unsigned int cmd,
        case SYNC_IOC_MERGE:
                return sync_fence_ioctl_merge(fence, arg);
 
+       case SYNC_IOC_FENCE_INFO:
+               return sync_fence_ioctl_fence_info(fence, arg);
+
        default:
                return -ENOTTY;
        }

diff --git a/include/linux/sync.h b/include/linux/sync.h
index d64271bd7a3c09a948e66f490e9a7a31a685cc61..4f1993871467ca31d0249529268f72659a3ff8d3 100644 (file)
--- a/include/linux/sync.h
+++ b/include/linux/sync.h
@@ -43,6 +43,10 @@ struct sync_fence;
  *                       should not print a newline
  * @print_pt:          print aditional debug information about sync_pt.
  *                       should not print a newline
+ * @fill_driver_data:  write implmentation specific driver data to data.
+ *                       should return an error if there is not enough room
+ *                       as specified by size.  This information is returned
+ *                       to userspace by SYNC_IOC_FENCE_INFO.
  */
 struct sync_timeline_ops {
        const char *driver_name;
@@ -68,6 +72,9 @@ struct sync_timeline_ops {
 
        /* optional */
        void (*print_pt)(struct seq_file *s, struct sync_pt *sync_pt);
+
+       /* optional */
+       int (*fill_driver_data)(struct sync_pt *syncpt, void *data, int size);
 };
 
 /**
@@ -312,6 +319,42 @@ struct sync_merge_data {
        __s32   fence; /* fd on newly created fence */
 };
 
+/**
+ * struct sync_pt_info - detailed sync_pt information
+ * @len:               length of sync_pt_info including any driver_data
+ * @obj_name:          name of parent sync_timeline
+ * @driver_name:       name of driver implmenting the parent
+ * @status:            status of the sync_pt 0:active 1:signaled <0:error
+ * @timestamp_ns:      timestamp of status change in nanoseconds
+ * @driver_data:       any driver dependant data
+ */
+struct sync_pt_info {
+       __u32   len;
+       char    obj_name[32];
+       char    driver_name[32];
+       __s32   status;
+       __u64   timestamp_ns;
+
+       __u8    driver_data[0];
+};
+
+/**
+ * struct sync_fence_info_data - data returned from fence info ioctl
+ * @len:       ioctl caller writes the size of the buffer its passing in.
+ *             ioctl returns length of sync_fence_data reutnred to userspace
+ *             including pt_info.
+ * @name:      name of fence
+ * @status:    status of fence. 1: signaled 0:active <0:error
+ * @pt_info:   a sync_pt_info struct for every sync_pt in the fence
+ */
+struct sync_fence_info_data {
+       __u32   len;
+       char    name[32];
+       __s32   status;
+
+       __u8    pt_info[0];
+};
+
 #define SYNC_IOC_MAGIC         '>'
 
 /**
@@ -330,4 +373,18 @@ struct sync_merge_data {
  */
 #define SYNC_IOC_MERGE         _IOWR(SYNC_IOC_MAGIC, 1, struct sync_merge_data)
 
+/**
+ * DOC: SYNC_IOC_FENCE_INFO - get detailed information on a fence
+ *
+ * Takes a struct sync_fence_info_data with extra space allocated for pt_info.
+ * Caller should write the size of the buffer into len.  On return, len is
+ * updated to reflect the total size of the sync_fence_info_data including
+ * pt_info.
+ *
+ * pt_info is a buffer containing sync_pt_infos for every sync_pt in the fence.
+ * To itterate over the sync_pt_infos, use the sync_pt_info.len field.
+ */
+#define SYNC_IOC_FENCE_INFO    _IOWR(SYNC_IOC_MAGIC, 2,\
+       struct sync_fence_info_data)
+
 #endif /* _LINUX_SYNC_H */