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Message-Id: <1616431467-14173-3-git-send-email-mihai.carabas@oracle.com>
Date: Mon, 22 Mar 2021 18:44:26 +0200
From: Mihai Carabas <mihai.carabas@...cle.com>
To: linux-kernel@...r.kernel.org
Cc: gregkh@...uxfoundation.org, arnd@...db.de,
bobo.shaobowang@...wei.com, rdunlap@...radead.org,
Mihai Carabas <mihai.carabas@...cle.com>
Subject: [PATCH v6 2/3] misc/pvpanic: probe multiple instances
Create the mecahism that allows multiple pvpanic instances to call
pvpanic_probe and receive panic events. A global list will retain all the
mapped addresses where to write panic events.
Signed-off-by: Mihai Carabas <mihai.carabas@...cle.com>
---
drivers/misc/pvpanic/pvpanic-mmio.c | 41 ++++++++++++---------
drivers/misc/pvpanic/pvpanic.c | 72 ++++++++++++++++++++++++++-----------
drivers/misc/pvpanic/pvpanic.h | 12 +++++--
3 files changed, 86 insertions(+), 39 deletions(-)
diff --git a/drivers/misc/pvpanic/pvpanic-mmio.c b/drivers/misc/pvpanic/pvpanic-mmio.c
index 801d892..0dd0e35 100644
--- a/drivers/misc/pvpanic/pvpanic-mmio.c
+++ b/drivers/misc/pvpanic/pvpanic-mmio.c
@@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/types.h>
+#include <linux/slab.h>
#include <uapi/misc/pvpanic.h>
@@ -23,25 +24,26 @@
MODULE_DESCRIPTION("pvpanic device driver");
MODULE_LICENSE("GPL");
-static void __iomem *base;
-static unsigned int capability = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED;
-static unsigned int events;
-
static ssize_t capability_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sysfs_emit(buf, "%x\n", capability);
+ struct pvpanic_instance *pi = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%x\n", pi->capability);
}
static DEVICE_ATTR_RO(capability);
static ssize_t events_show(struct device *dev, struct device_attribute *attr, char *buf)
{
- return sysfs_emit(buf, "%x\n", events);
+ struct pvpanic_instance *pi = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%x\n", pi->events);
}
static ssize_t events_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
+ struct pvpanic_instance *pi = dev_get_drvdata(dev);
unsigned int tmp;
int err;
@@ -49,15 +51,12 @@ static ssize_t events_store(struct device *dev, struct device_attribute *attr,
if (err)
return err;
- if ((tmp & capability) != tmp)
+ if ((tmp & pi->capability) != tmp)
return -EINVAL;
- events = tmp;
-
- pvpanic_set_events(events);
+ pi->events = tmp;
return count;
-
}
static DEVICE_ATTR_RW(events);
@@ -71,6 +70,7 @@ static ssize_t events_store(struct device *dev, struct device_attribute *attr,
static int pvpanic_mmio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ struct pvpanic_instance *pi;
struct resource *res;
void __iomem *base;
@@ -93,19 +93,28 @@ static int pvpanic_mmio_probe(struct platform_device *pdev)
return -EINVAL;
}
+ pi = kmalloc(sizeof(*pi), GFP_ATOMIC);
+ if (!pi)
+ return -ENOMEM;
+
+ pi->base = base;
+ pi->capability = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED;
+
/* initlize capability by RDPT */
- capability &= ioread8(base);
- events = capability;
+ pi->capability &= ioread8(base);
+ pi->events = pi->capability;
- pvpanic_probe(base, capability);
+ dev_set_drvdata(dev, pi);
- return 0;
+ return pvpanic_probe(pi);
}
static int pvpanic_mmio_remove(struct platform_device *pdev)
{
+ struct pvpanic_instance *pi = dev_get_drvdata(&pdev->dev);
- pvpanic_remove();
+ pvpanic_remove(pi);
+ kfree(pi);
return 0;
}
diff --git a/drivers/misc/pvpanic/pvpanic.c b/drivers/misc/pvpanic/pvpanic.c
index 11d029c..ac41edb 100644
--- a/drivers/misc/pvpanic/pvpanic.c
+++ b/drivers/misc/pvpanic/pvpanic.c
@@ -14,20 +14,27 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/types.h>
+#include <linux/cdev.h>
+#include <linux/list.h>
#include <uapi/misc/pvpanic.h>
#include "pvpanic.h"
-static void __iomem *base;
-static unsigned int capability;
-static unsigned int events;
+struct list_head pvpanic_list;
+spinlock_t pvpanic_lock;
static void
pvpanic_send_event(unsigned int event)
{
- if (event & capability & events)
- iowrite8(event, base);
+ struct pvpanic_instance *pi_cur;
+
+ spin_lock(&pvpanic_lock);
+ list_for_each_entry(pi_cur, &pvpanic_list, list) {
+ if (event & pi_cur->capability & pi_cur->events)
+ iowrite8(event, pi_cur->base);
+ }
+ spin_unlock(&pvpanic_lock);
}
static int
@@ -49,29 +56,54 @@
.priority = 1, /* let this called before broken drm_fb_helper */
};
-void pvpanic_probe(void __iomem *pbase, unsigned int dev_cap)
+int pvpanic_probe(struct pvpanic_instance *pi)
{
- base = pbase;
- capability = dev_cap;
- events = capability;
+ if (!pi || !pi->base)
+ return -EINVAL;
+
+ spin_lock(&pvpanic_lock);
+ list_add(&pi->list, &pvpanic_list);
+ spin_unlock(&pvpanic_lock);
- if (capability)
- atomic_notifier_chain_register(&panic_notifier_list,
- &pvpanic_panic_nb);
+ return 0;
}
EXPORT_SYMBOL_GPL(pvpanic_probe);
-void pvpanic_remove(void)
+void pvpanic_remove(struct pvpanic_instance *pi)
{
- if (capability)
- atomic_notifier_chain_unregister(&panic_notifier_list,
- &pvpanic_panic_nb);
- base = NULL;
+ struct pvpanic_instance *pi_cur, *pi_next;
+
+ if (!pi)
+ return;
+
+ spin_lock(&pvpanic_lock);
+ list_for_each_entry_safe(pi_cur, pi_next, &pvpanic_list, list) {
+ if (pi_cur == pi) {
+ list_del(&pi_cur->list);
+ break;
+ }
+ }
+ spin_unlock(&pvpanic_lock);
}
EXPORT_SYMBOL_GPL(pvpanic_remove);
-void pvpanic_set_events(unsigned int dev_events)
+static int pvpanic_init(void)
{
- events = dev_events;
+ INIT_LIST_HEAD(&pvpanic_list);
+ spin_lock_init(&pvpanic_lock);
+
+ atomic_notifier_chain_register(&panic_notifier_list,
+ &pvpanic_panic_nb);
+
+ return 0;
}
-EXPORT_SYMBOL_GPL(pvpanic_set_events);
+
+static void pvpanic_exit(void)
+{
+ atomic_notifier_chain_unregister(&panic_notifier_list,
+ &pvpanic_panic_nb);
+
+}
+
+module_init(pvpanic_init);
+module_exit(pvpanic_exit);
diff --git a/drivers/misc/pvpanic/pvpanic.h b/drivers/misc/pvpanic/pvpanic.h
index 3abe15f..1afccc2 100644
--- a/drivers/misc/pvpanic/pvpanic.h
+++ b/drivers/misc/pvpanic/pvpanic.h
@@ -8,8 +8,14 @@
#ifndef PVPANIC_H_
#define PVPANIC_H_
-void pvpanic_probe(void __iomem *base, unsigned int dev_cap);
-void pvpanic_remove(void);
-void pvpanic_set_events(unsigned int dev_events);
+struct pvpanic_instance {
+ void __iomem *base;
+ unsigned int capability;
+ unsigned int events;
+ struct list_head list;
+};
+
+int pvpanic_probe(struct pvpanic_instance *pi);
+void pvpanic_remove(struct pvpanic_instance *pi);
#endif /* PVPANIC_H_ */
--
1.8.3.1
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