From: Vikram Garhwal <vikram.garhwal@amd.com>
To: <xen-devel@lists.xenproject.org>
Cc: <sstabellini@kernel.org>, <vikram.garhwal@amd.com>,
<michal.orzel@amd.com>, Julien Grall <julien@xen.org>
Subject: [XEN][PATCH v6 08/19] xen/device-tree: Add device_tree_find_node_by_path() to find nodes in device tree
Date: Tue, 2 May 2023 16:36:39 -0700 [thread overview]
Message-ID: <20230502233650.20121-9-vikram.garhwal@amd.com> (raw)
In-Reply-To: <20230502233650.20121-1-vikram.garhwal@amd.com>
Add device_tree_find_node_by_path() to find a matching node with path for a
dt_device_node.
Reason behind this function:
Each time overlay nodes are added using .dtbo, a new fdt(memcpy of
device_tree_flattened) is created and updated with overlay nodes. This
updated fdt is further unflattened to a dt_host_new. Next, we need to find
the overlay nodes in dt_host_new, find the overlay node's parent in dt_host
and add the nodes as child under their parent in the dt_host. Thus we need
this function to search for node in different unflattened device trees.
Also, make dt_find_node_by_path() static inline.
Signed-off-by: Vikram Garhwal <vikram.garhwal@amd.com>
---
xen/common/device_tree.c | 5 +++--
xen/include/xen/device_tree.h | 17 +++++++++++++++--
2 files changed, 18 insertions(+), 4 deletions(-)
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index 47ab2f7940..426a809f42 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -358,11 +358,12 @@ struct dt_device_node *dt_find_node_by_type(struct dt_device_node *from,
return np;
}
-struct dt_device_node *dt_find_node_by_path(const char *path)
+struct dt_device_node *device_tree_find_node_by_path(struct dt_device_node *dt,
+ const char *path)
{
struct dt_device_node *np;
- dt_for_each_device_node(dt_host, np)
+ dt_for_each_device_node(dt, np)
if ( np->full_name && (dt_node_cmp(np->full_name, path) == 0) )
break;
diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index eef0335b79..d6366d3dac 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -534,13 +534,26 @@ struct dt_device_node *dt_find_node_by_type(struct dt_device_node *from,
struct dt_device_node *dt_find_node_by_alias(const char *alias);
/**
- * dt_find_node_by_path - Find a node matching a full DT path
+ * device_tree_find_node_by_path - Generic function to find a node matching the
+ * full DT path for any given unflatten device tree
+ * @dt_node: The device tree to search
* @path: The full path to match
*
* Returns a node pointer.
*/
-struct dt_device_node *dt_find_node_by_path(const char *path);
+struct dt_device_node *device_tree_find_node_by_path(struct dt_device_node *dt,
+ const char *path);
+/**
+ * dt_find_node_by_path - Find a node matching a full DT path in dt_host
+ * @path: The full path to match
+ *
+ * Returns a node pointer.
+ */
+static inline struct dt_device_node *dt_find_node_by_path(const char *path)
+{
+ return device_tree_find_node_by_path(dt_host, path);
+}
/**
* dt_find_node_by_gpath - Same as dt_find_node_by_path but retrieve the
--
2.17.1
next prev parent reply other threads:[~2023-05-02 23:38 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-02 23:36 [XEN][PATCH v6 00/19] dynamic node programming using overlay dtbo Vikram Garhwal
2023-05-02 23:36 ` [XEN][PATCH v6 01/19] xen/arm/device: Remove __init from function type Vikram Garhwal
2023-05-02 23:36 ` [XEN][PATCH v6 02/19] common/device_tree: handle memory allocation failure in __unflatten_device_tree() Vikram Garhwal
2023-05-04 3:54 ` Henry Wang
2023-05-05 9:38 ` Michal Orzel
[not found] ` <f854bfc4-1f3c-19df-ba22-89c8859cfe6d@amd.com>
2023-06-01 6:58 ` Michal Orzel
2023-05-02 23:36 ` [XEN][PATCH v6 03/19] common/device_tree: change __unflatten_device_tree() type Vikram Garhwal
2023-05-04 4:02 ` Henry Wang
2023-05-02 23:36 ` [XEN][PATCH v6 04/19] common/device_tree.c: unflatten_device_tree() propagate errors Vikram Garhwal
2023-05-04 4:08 ` Henry Wang
2023-05-02 23:36 ` [XEN][PATCH v6 05/19] xen/arm: Add CONFIG_OVERLAY_DTB Vikram Garhwal
2023-05-04 4:11 ` Henry Wang
2023-05-09 10:54 ` Michal Orzel
2023-05-02 23:36 ` [XEN][PATCH v6 06/19] libfdt: Keep fdt functions after init for CONFIG_OVERLAY_DTB Vikram Garhwal
2023-05-02 23:36 ` [XEN][PATCH v6 07/19] libfdt: overlay: change overlay_get_target() Vikram Garhwal
2023-05-04 4:13 ` Henry Wang
2023-05-02 23:36 ` Vikram Garhwal [this message]
2023-05-04 4:23 ` [XEN][PATCH v6 08/19] xen/device-tree: Add device_tree_find_node_by_path() to find nodes in device tree Henry Wang
2023-05-04 5:56 ` unsubscribe Terry Yang
2023-05-09 11:29 ` [XEN][PATCH v6 08/19] xen/device-tree: Add device_tree_find_node_by_path() to find nodes in device tree Michal Orzel
2023-05-31 21:31 ` Vikram Garhwal
2023-06-01 2:02 ` Henry Wang
2023-05-02 23:36 ` [XEN][PATCH v6 09/19] xen/iommu: Move spin_lock from iommu_dt_device_is_assigned to caller Vikram Garhwal
2023-05-03 7:53 ` Jan Beulich
2023-05-02 23:36 ` [XEN][PATCH v6 10/19] xen/iommu: protect iommu_add_dt_device() with dtdevs_lock Vikram Garhwal
2023-05-02 23:36 ` [XEN][PATCH v6 11/19] xen/iommu: Introduce iommu_remove_dt_device() Vikram Garhwal
2023-05-03 7:56 ` Jan Beulich
2023-05-02 23:36 ` [XEN][PATCH v6 12/19] xen/smmu: Add remove_device callback for smmu_iommu ops Vikram Garhwal
2023-05-02 23:36 ` [XEN][PATCH v6 13/19] asm/smp.h: Fix circular dependency for device_tree.h and rwlock.h Vikram Garhwal
2023-05-02 23:36 ` [XEN][PATCH v6 14/19] common/device_tree: Add rwlock for dt_host Vikram Garhwal
2023-05-04 4:38 ` Henry Wang
2023-05-02 23:36 ` [XEN][PATCH v6 15/19] xen/arm: Implement device tree node removal functionalities Vikram Garhwal
2023-05-03 7:59 ` Jan Beulich
2023-05-03 8:02 ` Jan Beulich
2023-05-09 14:30 ` Michal Orzel
2023-05-09 14:52 ` Andrew Cooper
2023-05-02 23:36 ` [XEN][PATCH v6 16/19] xen/arm: Implement device tree node addition functionalities Vikram Garhwal
2023-05-10 10:18 ` Michal Orzel
2023-06-02 0:49 ` Vikram Garhwal
2023-05-02 23:36 ` [XEN][PATCH v6 17/19] tools/libs/ctrl: Implement new xc interfaces for dt overlay Vikram Garhwal
2023-05-18 16:01 ` Anthony PERARD
2023-06-02 0:49 ` Vikram Garhwal
2023-05-02 23:36 ` [XEN][PATCH v6 18/19] tools/libs/light: Implement new libxl functions for device tree overlay ops Vikram Garhwal
2023-05-18 16:01 ` Anthony PERARD
2023-05-02 23:36 ` [XEN][PATCH v6 19/19] tools/xl: Add new xl command overlay for device tree overlay support Vikram Garhwal
2023-05-18 16:01 ` Anthony PERARD
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