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Message-Id: <1492228520-12450-2-git-send-email-frowand.list@gmail.com>
Date: Fri, 14 Apr 2017 20:55:17 -0700
From: frowand.list@...il.com
To: Rob Herring <robh+dt@...nel.org>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] of: remove *phandle properties from expanded device tree
From: Frank Rowand <frank.rowand@...y.com>
Remove "phandle" and "linux,phandle" properties from the internal
device tree. The phandle will still be in the struct device_node
phandle field.
This is to resolve the issue found by Stephen Boyd [1] when he changed
the type of struct property.value from void * to const void *. As
a result of the type change, the overlay code had compile errors
where the resolver updates phandle values.
[1] http://lkml.iu.edu/hypermail/linux/kernel/1702.1/04160.html
- Add sysfs infrastructure to report np->phandle, as if it was a property.
- Do not create "phandle" "ibm,phandle", and "linux,phandle" properties
in the expanded device tree.
- Remove no longer needed checks to exclude "phandle" and "linux,phandle"
properties in several locations.
- A side effect of these changes is that the obsolete "linux,phandle"
properties will no longer appear in /proc/device-tree
Signed-off-by: Frank Rowand <frank.rowand@...y.com>
---
drivers/of/base.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++---
drivers/of/dynamic.c | 29 ++++++++++++++++-------------
drivers/of/fdt.c | 40 ++++++++++++++++++++++++----------------
drivers/of/overlay.c | 4 +---
drivers/of/resolver.c | 23 +----------------------
include/linux/of.h | 1 +
6 files changed, 91 insertions(+), 57 deletions(-)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index d7c4629a3a2d..197946615503 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -116,6 +116,19 @@ static ssize_t of_node_property_read(struct file *filp, struct kobject *kobj,
return memory_read_from_buffer(buf, count, &offset, pp->value, pp->length);
}
+static ssize_t of_node_phandle_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *buf,
+ loff_t offset, size_t count)
+{
+ phandle phandle;
+ struct device_node *np;
+
+ np = container_of(bin_attr, struct device_node, attr_phandle);
+ phandle = cpu_to_be32(np->phandle);
+ return memory_read_from_buffer(buf, count, &offset, &phandle,
+ sizeof(phandle));
+}
+
/* always return newly allocated name, caller must free after use */
static const char *safe_name(struct kobject *kobj, const char *orig_name)
{
@@ -164,6 +177,38 @@ int __of_add_property_sysfs(struct device_node *np, struct property *pp)
return rc;
}
+/*
+ * In the imported device tree (fdt), phandle is a property. In the
+ * internal data structure it is instead stored in the struct device_node.
+ * Make phandle visible in sysfs as if it was a property.
+ */
+static int __of_add_phandle_sysfs(struct device_node *np)
+{
+ int rc;
+
+ if (IS_ENABLED(CONFIG_PPC_PSERIES))
+ return 0;
+
+ if (!IS_ENABLED(CONFIG_SYSFS))
+ return 0;
+
+ if (!of_kset || !of_node_is_attached(np))
+ return 0;
+
+ if (!np->phandle || np->phandle == 0xffffffff)
+ return 0;
+
+ sysfs_bin_attr_init(&pp->attr);
+ np->attr_phandle.attr.name = "phandle";
+ np->attr_phandle.attr.mode = 0444;
+ np->attr_phandle.size = sizeof(np->phandle);
+ np->attr_phandle.read = of_node_phandle_read;
+
+ rc = sysfs_create_bin_file(&np->kobj, &np->attr_phandle);
+ WARN(rc, "error adding attribute phandle to node %s\n", np->full_name);
+ return rc;
+}
+
int __of_attach_node_sysfs(struct device_node *np)
{
const char *name;
@@ -193,6 +238,8 @@ int __of_attach_node_sysfs(struct device_node *np)
if (rc)
return rc;
+ __of_add_phandle_sysfs(np);
+
for_each_property_of_node(np, pp)
__of_add_property_sysfs(np, pp);
@@ -2097,9 +2144,7 @@ void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align))
int id, len;
/* Skip those we do not want to proceed */
- if (!strcmp(pp->name, "name") ||
- !strcmp(pp->name, "phandle") ||
- !strcmp(pp->name, "linux,phandle"))
+ if (!strcmp(pp->name, "name"))
continue;
np = of_find_node_by_path(pp->value);
diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
index 888fdbc09992..c6fd3f32bfcb 100644
--- a/drivers/of/dynamic.c
+++ b/drivers/of/dynamic.c
@@ -218,19 +218,6 @@ int of_property_notify(int action, struct device_node *np,
void __of_attach_node(struct device_node *np)
{
- const __be32 *phandle;
- int sz;
-
- np->name = __of_get_property(np, "name", NULL) ? : "<NULL>";
- np->type = __of_get_property(np, "device_type", NULL) ? : "<NULL>";
-
- phandle = __of_get_property(np, "phandle", &sz);
- if (!phandle)
- phandle = __of_get_property(np, "linux,phandle", &sz);
- if (IS_ENABLED(CONFIG_PPC_PSERIES) && !phandle)
- phandle = __of_get_property(np, "ibm,phandle", &sz);
- np->phandle = (phandle && (sz >= 4)) ? be32_to_cpup(phandle) : 0;
-
np->child = NULL;
np->sibling = np->parent->child;
np->parent->child = np;
@@ -244,10 +231,22 @@ int of_attach_node(struct device_node *np)
{
struct of_reconfig_data rd;
unsigned long flags;
+ const __be32 *phandle;
+ int sz;
memset(&rd, 0, sizeof(rd));
rd.dn = np;
+ np->name = __of_get_property(np, "name", NULL) ? : "<NULL>";
+ np->type = __of_get_property(np, "device_type", NULL) ? : "<NULL>";
+
+ phandle = __of_get_property(np, "phandle", &sz);
+ if (!phandle)
+ phandle = __of_get_property(np, "linux,phandle", &sz);
+ if (IS_ENABLED(CONFIG_PPC_PSERIES) && !phandle)
+ phandle = __of_get_property(np, "ibm,phandle", &sz);
+ np->phandle = (phandle && (sz >= 4)) ? be32_to_cpup(phandle) : 0;
+
mutex_lock(&of_mutex);
raw_spin_lock_irqsave(&devtree_lock, flags);
__of_attach_node(np);
@@ -441,6 +440,10 @@ struct device_node *__of_node_dup(const struct device_node *np, const char *fmt,
}
}
}
+
+ node->name = __of_get_property(node, "name", NULL) ? : "<NULL>";
+ node->type = __of_get_property(node, "device_type", NULL) ? : "<NULL>";
+
return node;
err_prop:
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index e5ce4b59e162..270f31b0c259 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -181,6 +181,8 @@ static void populate_properties(const void *blob,
const __be32 *val;
const char *pname;
u32 sz;
+ int prop_is_phandle = 0;
+ int prop_is_ibm_phandle = 0;
val = fdt_getprop_by_offset(blob, cur, &pname, &sz);
if (!val) {
@@ -196,11 +198,6 @@ static void populate_properties(const void *blob,
if (!strcmp(pname, "name"))
has_name = true;
- pp = unflatten_dt_alloc(mem, sizeof(struct property),
- __alignof__(struct property));
- if (dryrun)
- continue;
-
/* We accept flattened tree phandles either in
* ePAPR-style "phandle" properties, or the
* legacy "linux,phandle" properties. If both
@@ -208,23 +205,34 @@ static void populate_properties(const void *blob,
* will get weird. Don't do that.
*/
if (!strcmp(pname, "phandle") ||
- !strcmp(pname, "linux,phandle")) {
- if (!np->phandle)
- np->phandle = be32_to_cpup(val);
- }
+ !strcmp(pname, "linux,phandle"))
+ prop_is_phandle = 1;
/* And we process the "ibm,phandle" property
* used in pSeries dynamic device tree
* stuff
*/
- if (!strcmp(pname, "ibm,phandle"))
- np->phandle = be32_to_cpup(val);
+ if (!strcmp(pname, "ibm,phandle")) {
+ prop_is_phandle = 1;
+ prop_is_ibm_phandle = 1;
+ }
+
+ if (!prop_is_phandle)
+ pp = unflatten_dt_alloc(mem, sizeof(struct property),
+ __alignof__(struct property));
- pp->name = (char *)pname;
- pp->length = sz;
- pp->value = (__be32 *)val;
- *pprev = pp;
- pprev = &pp->next;
+ if (dryrun)
+ continue;
+
+ if (!prop_is_phandle) {
+ pp->name = (char *)pname;
+ pp->length = sz;
+ pp->value = (__be32 *)val;
+ *pprev = pp;
+ pprev = &pp->next;
+ } else if (prop_is_ibm_phandle || !np->phandle) {
+ np->phandle = be32_to_cpup(val);
+ }
}
/* With version 0x10 we may not have the name property,
diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index 7827786718d8..ca0b85f5deb1 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -101,9 +101,7 @@ static int of_overlay_apply_single_property(struct of_overlay *ov,
tprop = of_find_property(target, prop->name, NULL);
/* special properties are not meant to be updated (silent NOP) */
- if (of_prop_cmp(prop->name, "name") == 0 ||
- of_prop_cmp(prop->name, "phandle") == 0 ||
- of_prop_cmp(prop->name, "linux,phandle") == 0)
+ if (!of_prop_cmp(prop->name, "name"))
return 0;
propn = __of_prop_dup(prop, GFP_KERNEL);
diff --git a/drivers/of/resolver.c b/drivers/of/resolver.c
index 7ae9863cb0a4..624cbaeae0a4 100644
--- a/drivers/of/resolver.c
+++ b/drivers/of/resolver.c
@@ -71,30 +71,11 @@ static void adjust_overlay_phandles(struct device_node *overlay,
int phandle_delta)
{
struct device_node *child;
- struct property *prop;
- phandle phandle;
/* adjust node's phandle in node */
if (overlay->phandle != 0 && overlay->phandle != OF_PHANDLE_ILLEGAL)
overlay->phandle += phandle_delta;
- /* copy adjusted phandle into *phandle properties */
- for_each_property_of_node(overlay, prop) {
-
- if (of_prop_cmp(prop->name, "phandle") &&
- of_prop_cmp(prop->name, "linux,phandle"))
- continue;
-
- if (prop->length < 4)
- continue;
-
- phandle = be32_to_cpup(prop->value);
- if (phandle == OF_PHANDLE_ILLEGAL)
- continue;
-
- *(uint32_t *)prop->value = cpu_to_be32(overlay->phandle);
- }
-
for_each_child_of_node(overlay, child)
adjust_overlay_phandles(child, phandle_delta);
}
@@ -197,9 +178,7 @@ static int adjust_local_phandle_references(struct device_node *local_fixups,
for_each_property_of_node(local_fixups, prop_fix) {
/* skip properties added automatically */
- if (!of_prop_cmp(prop_fix->name, "name") ||
- !of_prop_cmp(prop_fix->name, "phandle") ||
- !of_prop_cmp(prop_fix->name, "linux,phandle"))
+ if (!of_prop_cmp(prop_fix->name, "name"))
continue;
if ((prop_fix->length % 4) != 0 || prop_fix->length == 0)
diff --git a/include/linux/of.h b/include/linux/of.h
index 21e6323de0f3..4e86e05853f3 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -61,6 +61,7 @@ struct device_node {
struct kobject kobj;
unsigned long _flags;
void *data;
+ struct bin_attribute attr_phandle;
#if defined(CONFIG_SPARC)
const char *path_component_name;
unsigned int unique_id;
--
Frank Rowand <frank.rowand@...y.com>
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