x86: print info about available HPET quirk

We have a lot of HPET quirks available which might force enable HPET
even when the BIOS does not enable it. Some of those quirks depend on
the command line option "hpet=force".

Andrew pointed out that hoping that the user will find out about this
boot option is not really helpful.

Emit a kernel info which informs the user about the "hpet=force" boot
option when we enter a quirk which depends on this option and the user
did not provide it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 26 insertions, 3 deletions

diff --git a/arch/x86/kernel/quirks.c b/arch/x86/kernel/quirks.c
index 5fe6bd5cc4c..ddbf34d16a0 100644
--- a/arch/x86/kernel/quirks.c
+++ b/arch/x86/kernel/quirks.c
@@ -175,6 +175,12 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_7,
 
 static struct pci_dev *cached_dev;
 
+static void hpet_print_force_info(void)
+{
+	printk(KERN_INFO "HPET not enabled in BIOS. "
+	       "You might try hpet=force boot option\n");
+}
+
 static void old_ich_force_hpet_resume(void)
 {
 	u32 val;
@@ -254,6 +260,8 @@ static void old_ich_force_enable_hpet_user(struct pci_dev *dev)
 {
 	if (hpet_force_user)
 		old_ich_force_enable_hpet(dev);
+	else
+		hpet_print_force_info();
 }
 
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0,
@@ -291,8 +299,13 @@ static void vt8237_force_enable_hpet(struct pci_dev *dev)
 {
 	u32 uninitialized_var(val);
 
-	if (!hpet_force_user || hpet_address || force_hpet_address)
+	if (hpet_address || force_hpet_address)
+		return;
+
+	if (!hpet_force_user) {
+		hpet_print_force_info();
 		return;
+	}
 
 	pci_read_config_dword(dev, 0x68, &val);
 	/*
@@ -341,8 +354,13 @@ static void ati_force_enable_hpet(struct pci_dev *dev)
 {
 	u32 uninitialized_var(val);
 
-	if (!hpet_force_user || hpet_address || force_hpet_address)
+	if (hpet_address || force_hpet_address)
+		return;
+
+	if (!hpet_force_user) {
+		hpet_print_force_info();
 		return;
+	}
 
 	pci_write_config_dword(dev, 0x14, 0xfed00000);
 	pci_read_config_dword(dev, 0x14, &val);
@@ -369,8 +387,13 @@ static void nvidia_force_enable_hpet(struct pci_dev *dev)
 {
 	u32 uninitialized_var(val);
 
-	if (!hpet_force_user || hpet_address || force_hpet_address)
+	if (hpet_address || force_hpet_address)
+		return;
+
+	if (!hpet_force_user) {
+		hpet_print_force_info();
 		return;
+	}
 
 	pci_write_config_dword(dev, 0x44, 0xfed00001);
 	pci_read_config_dword(dev, 0x44, &val);