PNP: disable Supermicro H8DCE motherboard resources that overlap SATA BARs

Some Supermicro BIOSes describe a SATA PCI BAR as a motherboard resource.
The PNP system driver claims motherboard resources, and this prevents the
sata_nv driver from requesting it later.

This patch disables the PNP0C01/PNP0C02 resources so they won't be claimed
by the PNP system driver, so they'll available for sata_nv.

This fixes the bugs below, where sata_nv detects only two out of four SATA
drives.  The signature includes dmesg lines similar to these:

  pnp: 00:09: iomem range 0xdfefc000-0xdfefcfff has been reserved
  pnp: 00:09: iomem range 0xdfefd000-0xdfefd3ff has been reserved
  pnp: 00:09: iomem range 0xdfefe000-0xdfefe3ff has been reserved

  PCI: Unable to reserve mem region #6:1000@dfefd000 for device 0000:80:07.0
  sata_nv: probe of 0000:80:07.0 failed with error -16
  PCI: Unable to reserve mem region #6:1000@dfefe000 for device 0000:80:08.0
  sata_nv: probe of 0000:80:08.0 failed with error -16

References:
    https://bugzilla.redhat.com/show_bug.cgi?id=280641
    https://bugzilla.redhat.com/show_bug.cgi?id=313491
    http://lkml.org/lkml/2008/1/9/449
    http://thread.gmane.org/gmane.linux.acpi.devel/27312

This is post-2.6.24 material.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c
index e903b8c2b1fa..4065139753b6 100644
--- a/drivers/pnp/quirks.c
+++ b/drivers/pnp/quirks.c
@@ -17,6 +17,7 @@
 #include <linux/slab.h>
 #include <linux/pnp.h>
 #include <linux/io.h>
+#include <linux/dmi.h>
 #include <linux/kallsyms.h>
 #include "base.h"
 
@@ -108,6 +109,46 @@ static void quirk_sb16audio_resources(struct pnp_dev *dev)
                        "pnp: SB audio device quirk - increasing port range\n");
 }
 
+static void quirk_supermicro_h8dce_system(struct pnp_dev *dev)
+{
+        int i;
+        static struct dmi_system_id supermicro_h8dce[] = {
+                {
+                        .ident = "Supermicro H8DCE",
+                        .matches = {
+                                DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
+                                DMI_MATCH(DMI_PRODUCT_NAME, "H8DCE"),
+                        },
+                },
+                { }
+        };
+
+        if (!dmi_check_system(supermicro_h8dce))
+                return;
+
+        /*
+         * On the Supermicro H8DCE, there's a system device with resources
+         * that overlap BAR 6 of the built-in SATA PCI adapter.  If the PNP
+         * system device claims them, the sata_nv driver won't be able to.
+         * More details at:
+         *     https://bugzilla.redhat.com/show_bug.cgi?id=280641
+         *     https://bugzilla.redhat.com/show_bug.cgi?id=313491
+         *     http://lkml.org/lkml/2008/1/9/449
+         *     http://thread.gmane.org/gmane.linux.acpi.devel/27312
+         */
+        for (i = 0; i < PNP_MAX_MEM; i++) {
+                if (pnp_mem_valid(dev, i) && pnp_mem_len(dev, i) &&
+                    (pnp_mem_start(dev, i) & 0xdfef0000) == 0xdfef0000) {
+                        dev_warn(&dev->dev, "disabling 0x%llx-0x%llx to prevent"
+                                " conflict with sata_nv PCI device\n",
+                                (unsigned long long) pnp_mem_start(dev, i),
+                                (unsigned long long) (pnp_mem_start(dev, i) +
+                                        pnp_mem_len(dev, i) - 1));
+                        pnp_mem_flags(dev, i) = 0;
+                }
+        }
+}
+
 /*
  *  PnP Quirks
  *  Cards or devices that need some tweaking due to incomplete resource info
@@ -128,6 +169,8 @@ static struct pnp_fixup pnp_fixups[] = {
         {"CTL0043", quirk_sb16audio_resources},
         {"CTL0044", quirk_sb16audio_resources},
         {"CTL0045", quirk_sb16audio_resources},
+        {"PNP0c01", quirk_supermicro_h8dce_system},
+        {"PNP0c02", quirk_supermicro_h8dce_system},
         {""}
 };