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Message-ID: <20100923233047.12463.61480.stgit@bob.kio>
Date: Thu, 23 Sep 2010 17:30:47 -0600
From: Bjorn Helgaas <bjorn.helgaas@...com>
To: Venkatesh Pallipadi <venki@...gle.com>
Cc: Prarit Bhargava <prarit@...hat.com>, fredlwm@...il.com,
Simon Arlott <simon@...e.lp0.eu>, x86@...nel.org,
Clemens Ladisch <clemens@...isch.de>,
linux-kernel@...r.kernel.org, Marc Jones <marcj303@...il.com>,
Jordan Crouse <jcrouse@...eaurora.org>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] x86, HPET: mark HPET PCI BARs as IORESOURCE_PCI_FIXED
We often discover the HPET early, via the static ACPI HPET table, before
enumerating PCI devices. If the HPET is implemented as a PCI function,
we will discover it again during PCI device enumeration. We must make
sure we never move the PCI function out from under the driver.
Doing this for *any* PCI BAR that matches a previously discovered HPET
should be more generic than the previous ATI-specific quirk.
This is for a regression from 2.6.34, but the reporter has been unable
to test it yet.
Reference: https://bugzilla.kernel.org/show_bug.cgi?id=18482
Reported-by: Simon Arlott <simon@...e.lp0.eu>
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@...com>
---
arch/x86/kernel/quirks.c | 19 +++++++++++++++++++
arch/x86/pci/fixup.c | 28 ----------------------------
2 files changed, 19 insertions(+), 28 deletions(-)
diff --git a/arch/x86/kernel/quirks.c b/arch/x86/kernel/quirks.c
index 939b9e9..8acd667 100644
--- a/arch/x86/kernel/quirks.c
+++ b/arch/x86/kernel/quirks.c
@@ -507,6 +507,25 @@ static void force_disable_hpet_msi(struct pci_dev *unused)
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS,
force_disable_hpet_msi);
+static void mark_pci_hpet_fixed(struct pci_dev *dev)
+{
+ int i;
+
+ if (!hpet_address)
+ return;
+
+ for (i = 0; i < 6; i++) {
+ struct resource *res = &dev->resource[i];
+
+ if (resource_type(res) == IORESOURCE_MEM &&
+ res->start == hpet_address) {
+ dev_info(&dev->dev, "BAR %d: %pR is an HPET we found earlier; making it immovable\n",
+ i, res);
+ res->flags |= IORESOURCE_PCI_FIXED;
+ }
+ }
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, mark_pci_hpet_fixed);
#endif
#if defined(CONFIG_PCI) && defined(CONFIG_NUMA)
diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c
index 6dd8955..08eba69 100644
--- a/arch/x86/pci/fixup.c
+++ b/arch/x86/pci/fixup.c
@@ -493,31 +493,3 @@ static void __devinit pci_siemens_interrupt_controller(struct pci_dev *dev)
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SIEMENS, 0x0015,
pci_siemens_interrupt_controller);
-
-/*
- * SB600: Disable BAR1 on device 14.0 to avoid HPET resources from
- * confusing the PCI engine:
- */
-static void sb600_disable_hpet_bar(struct pci_dev *dev)
-{
- u8 val;
-
- /*
- * The SB600 and SB700 both share the same device
- * ID, but the PM register 0x55 does something different
- * for the SB700, so make sure we are dealing with the
- * SB600 before touching the bit:
- */
-
- pci_read_config_byte(dev, 0x08, &val);
-
- if (val < 0x2F) {
- outb(0x55, 0xCD6);
- val = inb(0xCD7);
-
- /* Set bit 7 in PM register 0x55 */
- outb(0x55, 0xCD6);
- outb(val | 0x80, 0xCD7);
- }
-}
-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ATI, 0x4385, sb600_disable_hpet_bar);
--
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