IPMI: Add one interface to get more info of low-level IPMI device

The IPMI smi_watcher will be used to catch the IPMI interface as they
come or go.  In order to communicate with the correct IPMI device, it
should be confirmed whether it is what we wanted especially on the
system with multiple IPMI devices. But the new_smi callback function
of smi_watcher provides very limited info(only the interface number
and dev pointer) and there is no detailed info about the low level
interface. For example: which mechansim registers the IPMI
interface(ACPI, PCI, DMI and so on).

This is to add one interface that can get more info of low-level IPMI
device. For example: the ACPI device handle will be returned for the
pnp_acpi IPMI device.

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Len Brown <len.brown@intel.com>

2 files changed, 43 insertions, 4 deletions

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index 2fe72f8edf4..38223e93aa9 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -970,6 +970,33 @@ out_kfree:
 }
 EXPORT_SYMBOL(ipmi_create_user);
 
+int ipmi_get_smi_info(int if_num, struct ipmi_smi_info *data)
+{
+        int           rv = 0;
+        ipmi_smi_t    intf;
+        struct ipmi_smi_handlers *handlers;
+
+        mutex_lock(&ipmi_interfaces_mutex);
+        list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
+                if (intf->intf_num == if_num)
+                        goto found;
+        }
+        /* Not found, return an error */
+        rv = -EINVAL;
+        mutex_unlock(&ipmi_interfaces_mutex);
+        return rv;
+
+found:
+        handlers = intf->handlers;
+        rv = -ENOSYS;
+        if (handlers->get_smi_info)
+                rv = handlers->get_smi_info(intf->send_info, data);
+        mutex_unlock(&ipmi_interfaces_mutex);
+
+        return rv;
+}
+EXPORT_SYMBOL(ipmi_get_smi_info);
+
 static void free_user(struct kref *ref)
 {
         ipmi_user_t user = container_of(ref, struct ipmi_user, refcount);
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 035da9e64a1..945ae4d5d21 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -57,6 +57,7 @@
 #include <asm/irq.h>
 #include <linux/interrupt.h>
 #include <linux/rcupdate.h>
+#include <linux/ipmi.h>
 #include <linux/ipmi_smi.h>
 #include <asm/io.h>
 #include "ipmi_si_sm.h"
@@ -107,10 +108,6 @@ enum si_type {
 };
 static char *si_to_str[] = { "kcs", "smic", "bt" };
 
-enum ipmi_addr_src {
-        SI_INVALID = 0, SI_HOTMOD, SI_HARDCODED, SI_SPMI, SI_ACPI, SI_SMBIOS,
-        SI_PCI, SI_DEVICETREE, SI_DEFAULT
-};
 static char *ipmi_addr_src_to_str[] = { NULL, "hotmod", "hardcoded", "SPMI",
                                         "ACPI", "SMBIOS", "PCI",
                                         "device-tree", "default" };
@@ -291,6 +288,7 @@ struct smi_info {
         struct task_struct *thread;
 
         struct list_head link;
+        union ipmi_smi_info_union addr_info;
 };
 
 #define smi_inc_stat(smi, stat) \
@@ -1186,6 +1184,18 @@ static int smi_start_processing(void       *send_info,
         return 0;
 }
 
+static int get_smi_info(void *send_info, struct ipmi_smi_info *data)
+{
+        struct smi_info *smi = send_info;
+
+        data->addr_src = smi->addr_source;
+        data->dev = smi->dev;
+        data->addr_info = smi->addr_info;
+        get_device(smi->dev);
+
+        return 0;
+}
+
 static void set_maintenance_mode(void *send_info, int enable)
 {
         struct smi_info   *smi_info = send_info;
@@ -1197,6 +1207,7 @@ static void set_maintenance_mode(void *send_info, int enable)
 static struct ipmi_smi_handlers handlers = {
         .owner                  = THIS_MODULE,
         .start_processing       = smi_start_processing,
+        .get_smi_info           = get_smi_info,
         .sender                 = sender,
         .request_events         = request_events,
         .set_maintenance_mode   = set_maintenance_mode,
@@ -2156,6 +2167,7 @@ static int __devinit ipmi_pnp_probe(struct pnp_dev *dev,
         printk(KERN_INFO PFX "probing via ACPI\n");
 
         handle = acpi_dev->handle;
+        info->addr_info.acpi_info.acpi_handle = handle;
 
         /* _IFT tells us the interface type: KCS, BT, etc */
         status = acpi_evaluate_integer(handle, "_IFT", NULL, &tmp);