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authorMario Limonciello <mario.limonciello@dell.com>2017-11-17 07:13:12 +0300
committerDarren Hart (VMware) <dvhart@infradead.org>2017-11-20 23:38:43 +0300
commit4255c30fe88ee3cc99bbeac7974db27e4217a497 (patch)
tree4950a7b7da05a1b76e52ba02278fab796faf302b /drivers/platform
parentaaa40965d2342137d756121993c395e2a7463a8d (diff)
downloadlinux-4255c30fe88ee3cc99bbeac7974db27e4217a497.tar.xz
platform/x86: dell-smbios-wmi: Disable userspace interface if missing hotfix
The Dell SMBIOS WMI interface will fail for some more complex calls unless a WMI hotfix has been included. Most platforms have this fix available in a maintenance BIOS release. In the case the driver is loaded on a platform without this fix, disable the userspace interface. A hotfix indicator is present in the dell-wmi-descriptor that represents whether or not more complex calls will work properly. "Simple" calls such as those used by dell-laptop and dell-wmi will continue to work properly so dell-smbios-wmi should not be blocked from binding and being used as the dell-smbios dispatcher. Suggested-by: Girish Prakash <girish.prakash@dell.com> Signed-off-by: Mario Limonciello <mario.limonciello@dell.com> Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
Diffstat (limited to 'drivers/platform')
-rw-r--r--drivers/platform/x86/dell-smbios-wmi.c13
-rw-r--r--drivers/platform/x86/dell-wmi-descriptor.c26
-rw-r--r--drivers/platform/x86/dell-wmi-descriptor.h1
3 files changed, 38 insertions, 2 deletions
diff --git a/drivers/platform/x86/dell-smbios-wmi.c b/drivers/platform/x86/dell-smbios-wmi.c
index 0cab1f9c35af..609557aa5868 100644
--- a/drivers/platform/x86/dell-smbios-wmi.c
+++ b/drivers/platform/x86/dell-smbios-wmi.c
@@ -147,7 +147,10 @@ fail_smbios_cmd:
static int dell_smbios_wmi_probe(struct wmi_device *wdev)
{
+ struct wmi_driver *wdriver =
+ container_of(wdev->dev.driver, struct wmi_driver, driver);
struct wmi_smbios_priv *priv;
+ u32 hotfix;
int count;
int ret;
@@ -164,6 +167,16 @@ static int dell_smbios_wmi_probe(struct wmi_device *wdev)
if (!dell_wmi_get_size(&priv->req_buf_size))
return -EPROBE_DEFER;
+ /* some SMBIOS calls fail unless BIOS contains hotfix */
+ if (!dell_wmi_get_hotfix(&hotfix))
+ return -EPROBE_DEFER;
+ if (!hotfix) {
+ dev_warn(&wdev->dev,
+ "WMI SMBIOS userspace interface not supported(%u), try upgrading to a newer BIOS\n",
+ hotfix);
+ wdriver->filter_callback = NULL;
+ }
+
/* add in the length object we will use internally with ioctl */
priv->req_buf_size += sizeof(u64);
ret = set_required_buffer_size(wdev, priv->req_buf_size);
diff --git a/drivers/platform/x86/dell-wmi-descriptor.c b/drivers/platform/x86/dell-wmi-descriptor.c
index 4dfef1f53481..072821aa47fc 100644
--- a/drivers/platform/x86/dell-wmi-descriptor.c
+++ b/drivers/platform/x86/dell-wmi-descriptor.c
@@ -27,6 +27,7 @@ struct descriptor_priv {
struct list_head list;
u32 interface_version;
u32 size;
+ u32 hotfix;
};
static int descriptor_valid = -EPROBE_DEFER;
static LIST_HEAD(wmi_list);
@@ -77,6 +78,24 @@ bool dell_wmi_get_size(u32 *size)
}
EXPORT_SYMBOL_GPL(dell_wmi_get_size);
+bool dell_wmi_get_hotfix(u32 *hotfix)
+{
+ struct descriptor_priv *priv;
+ bool ret = false;
+
+ mutex_lock(&list_mutex);
+ priv = list_first_entry_or_null(&wmi_list,
+ struct descriptor_priv,
+ list);
+ if (priv) {
+ *hotfix = priv->hotfix;
+ ret = true;
+ }
+ mutex_unlock(&list_mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(dell_wmi_get_hotfix);
+
/*
* Descriptor buffer is 128 byte long and contains:
*
@@ -85,6 +104,7 @@ EXPORT_SYMBOL_GPL(dell_wmi_get_size);
* Object Signature 4 4 " WMI"
* WMI Interface Version 8 4 <version>
* WMI buffer length 12 4 <length>
+ * WMI hotfix number 16 4 <hotfix>
*/
static int dell_wmi_descriptor_probe(struct wmi_device *wdev)
{
@@ -144,15 +164,17 @@ static int dell_wmi_descriptor_probe(struct wmi_device *wdev)
priv->interface_version = buffer[2];
priv->size = buffer[3];
+ priv->hotfix = buffer[4];
ret = 0;
dev_set_drvdata(&wdev->dev, priv);
mutex_lock(&list_mutex);
list_add_tail(&priv->list, &wmi_list);
mutex_unlock(&list_mutex);
- dev_dbg(&wdev->dev, "Detected Dell WMI interface version %lu and buffer size %lu\n",
+ dev_dbg(&wdev->dev, "Detected Dell WMI interface version %lu, buffer size %lu, hotfix %lu\n",
(unsigned long) priv->interface_version,
- (unsigned long) priv->size);
+ (unsigned long) priv->size,
+ (unsigned long) priv->hotfix);
out:
kfree(obj);
diff --git a/drivers/platform/x86/dell-wmi-descriptor.h b/drivers/platform/x86/dell-wmi-descriptor.h
index 1e8cb96ffd78..a6123a4d06a7 100644
--- a/drivers/platform/x86/dell-wmi-descriptor.h
+++ b/drivers/platform/x86/dell-wmi-descriptor.h
@@ -23,5 +23,6 @@ int dell_wmi_get_descriptor_valid(void);
bool dell_wmi_get_interface_version(u32 *version);
bool dell_wmi_get_size(u32 *size);
+bool dell_wmi_get_hotfix(u32 *hotfix);
#endif