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authorMihai Carabas <mihai.carabas@oracle.com>2021-03-24 17:49:15 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-03-28 15:56:47 +0300
commitb3c0f8774668fd30a3efb2d0afc1a6527dacb858 (patch)
tree3f4ad1b95bc7ab3151767f9f1bada8aa336d6a6a /drivers/misc/pvpanic
parent6861d27cf590d20a95b5d0724ac3768583b62947 (diff)
downloadlinux-b3c0f8774668fd30a3efb2d0afc1a6527dacb858.tar.xz
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@oracle.com> Link: https://lore.kernel.org/r/1616597356-20696-3-git-send-email-mihai.carabas@oracle.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/pvpanic')
-rw-r--r--drivers/misc/pvpanic/pvpanic-mmio.c42
-rw-r--r--drivers/misc/pvpanic/pvpanic.c72
-rw-r--r--drivers/misc/pvpanic/pvpanic.h12
3 files changed, 87 insertions, 39 deletions
diff --git a/drivers/misc/pvpanic/pvpanic-mmio.c b/drivers/misc/pvpanic/pvpanic-mmio.c
index d7bf7db6c19c..4c0841776087 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_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
MODULE_DESCRIPTION("pvpanic-mmio 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);
@@ -71,7 +70,9 @@ ATTRIBUTE_GROUPS(pvpanic_mmio_dev);
static int pvpanic_mmio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ struct pvpanic_instance *pi;
struct resource *res;
+ void __iomem *base;
res = platform_get_mem_or_io(pdev, 0);
if (!res)
@@ -92,19 +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 a9605f90c534..804099c2d7fa 100644
--- a/drivers/misc/pvpanic/pvpanic.c
+++ b/drivers/misc/pvpanic/pvpanic.c
@@ -14,6 +14,8 @@
#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>
@@ -23,15 +25,20 @@ MODULE_AUTHOR("Mihai Carabas <mihai.carabas@oracle.com>");
MODULE_DESCRIPTION("pvpanic device driver ");
MODULE_LICENSE("GPL");
-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
@@ -53,29 +60,54 @@ static struct notifier_block pvpanic_panic_nb = {
.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 3abe15fa24b8..1afccc2e9fec 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_ */