From: Bjorn Helgaas <bjorn.helgaas@hp.com>
Date: Fri, 23 Apr 2010 23:05:24 +0000 (-0600)
Subject: x86/PCI: never allocate PCI MMIO resources below BIOS_END
X-Git-Tag: firefly_0821_release~9833^2~2257^2~1
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=55051feb57eba600b366006757304a0af3ada2bd;p=firefly-linux-kernel-4.4.55.git

x86/PCI: never allocate PCI MMIO resources below BIOS_END

When we move a PCI device or assign resources to a device not configured
by the BIOS, we want to avoid the BIOS region below 1MB.  Note that if the
BIOS places devices below 1MB, we leave them there.

See https://bugzilla.kernel.org/show_bug.cgi?id=15744
and https://bugzilla.kernel.org/show_bug.cgi?id=15841

Tested-by: Andy Isaacson <adi@hexapodia.org>
Tested-by: Andy Bailey <bailey@akamai.com>
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---

diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 46fd43f79103..97da2ba9344b 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -72,6 +72,9 @@ pcibios_align_resource(void *data, const struct resource *res,
 			return start;
 		if (start & 0x300)
 			start = (start + 0x3ff) & ~0x3ff;
+	} else if (res->flags & IORESOURCE_MEM) {
+		if (start < BIOS_END)
+			start = BIOS_END;
 	}
 	return start;
 }