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powerpc+of: Add of node/property notification chain for adds and removes

Bläddra i källkod 
This patch moves the notification chain for updates to the device tree
from the powerpc/pseries code to the base OF code. This makes this
functionality available to all architectures.

Additionally the notification chain is updated to allow notifications
for property add/remove/update. To make this work a pointer to a new
struct (of_prop_reconfig) is passed to the routines in the notification chain.
The of_prop_reconfig property contains a pointer to the node containing the
property and a pointer to the property itself. In the case of property
updates, the property pointer refers to the new property.

Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Nathan Fontenot
2012-10-02 16:57:57 +00:00
committad av Benjamin Herrenschmidt
förälder f594972083
incheckning 1cf3d8b3d2
12 ändrade filer med 163 tillägg och 154 borttagningar
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68
arch/powerpc/platforms/pseries/reconfig.c
Visa fil

@@ -16,11 +16,11 @@
#include <linux/notifier.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/uaccess.h>
#include <asm/pSeries_reconfig.h>
#include <asm/mmu.h>
/**
@@ -55,28 +55,6 @@ static struct device_node *derive_parent(const char *path)
return parent;
}
static BLOCKING_NOTIFIER_HEAD(pSeries_reconfig_chain);
int pSeries_reconfig_notifier_register(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&pSeries_reconfig_chain, nb);
}
EXPORT_SYMBOL_GPL(pSeries_reconfig_notifier_register);
void pSeries_reconfig_notifier_unregister(struct notifier_block *nb)
{
blocking_notifier_chain_unregister(&pSeries_reconfig_chain, nb);
}
EXPORT_SYMBOL_GPL(pSeries_reconfig_notifier_unregister);
int pSeries_reconfig_notify(unsigned long action, void *p)
{
int err = blocking_notifier_call_chain(&pSeries_reconfig_chain,
action, p);
return notifier_to_errno(err);
}
static int pSeries_reconfig_add_node(const char *path, struct property *proplist)
{
struct device_node *np;
@@ -100,13 +78,12 @@ static int pSeries_reconfig_add_node(const char *path, struct property *proplist
goto out_err;
}
err = pSeries_reconfig_notify(PSERIES_RECONFIG_ADD, np);
err = of_attach_node(np);
if (err) {
printk(KERN_ERR "Failed to add device node %s\n", path);
goto out_err;
}
of_attach_node(np);
of_node_put(np->parent);
return 0;
@@ -134,9 +111,7 @@ static int pSeries_reconfig_remove_node(struct device_node *np)
return -EBUSY;
}
pSeries_reconfig_notify(PSERIES_RECONFIG_REMOVE, np);
of_detach_node(np);
of_node_put(parent);
of_node_put(np); /* Must decrement the refcount */
return 0;
@@ -381,10 +356,9 @@ static int do_remove_property(char *buf, size_t bufsize)
static int do_update_property(char *buf, size_t bufsize)
{
struct device_node *np;
struct pSeries_reconfig_prop_update upd_value;
unsigned char *value;
char *name, *end, *next_prop;
int rc, length;
int length;
struct property *newprop;
buf = parse_node(buf, bufsize, &np);
end = buf + bufsize;
@@ -406,41 +380,7 @@ static int do_update_property(char *buf, size_t bufsize)
if (!strcmp(name, "slb-size") || !strcmp(name, "ibm,slb-size"))
slb_set_size(*(int *)value);
upd_value.node = np;
upd_value.property = newprop;
pSeries_reconfig_notify(PSERIES_UPDATE_PROPERTY, &upd_value);
rc = prom_update_property(np, newprop);
if (rc)
return rc;
/* For memory under the ibm,dynamic-reconfiguration-memory node
* of the device tree, adding and removing memory is just an update
* to the ibm,dynamic-memory property instead of adding/removing a
* memory node in the device tree. For these cases we still need to
* involve the notifier chain.
*/
if (!strcmp(name, "ibm,dynamic-memory")) {
int action;
next_prop = parse_next_property(next_prop, end, &name,
&length, &value);
if (!next_prop)
return -EINVAL;
if (!strcmp(name, "add"))
action = PSERIES_DRCONF_MEM_ADD;
else
action = PSERIES_DRCONF_MEM_REMOVE;
rc = pSeries_reconfig_notify(action, value);
if (rc) {
prom_update_property(np, newprop);
return rc;
}
}
return 0;
return prom_update_property(np, newprop);
}
/**