The patch titled
PCI legacy resource fix
has been added to the -mm tree. Its filename is
pci-legacy-resource-fix.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: PCI legacy resource fix
From: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Since commit 368c73d4f689dae0807d0a2aa74c61fd2b9b075f the kernel will try
to update the non-writeable BAR registers 0..3 of PIIX4 IDE adapters if
pci_assign_unassigned_resources() is used to do full resource assignment of
the bus. This fails because in the PIIX4 these BAR registers have
implicitly assumed values and read back as zero; it used to work because
the kernel used to just write zero to that register the read back value did
match what was written.
The fix is a new resource flag IORESOURCE_PCI_FIXED used to mark a resource
as non-movable. This will also be useful to keep other import system
resources from being moved around - for example system consoles on PCI
busses.
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Acked-by: Alan Cox <alan@xxxxxxxxxx>
Cc: Greg KH <greg@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/pci/probe.c | 11 +++++++----
drivers/pci/setup-res.c | 11 +++++++++++
include/linux/ioport.h | 3 +++
3 files changed, 21 insertions(+), 4 deletions(-)
diff -puN drivers/pci/probe.c~pci-legacy-resource-fix drivers/pci/probe.c
--- a/drivers/pci/probe.c~pci-legacy-resource-fix
+++ a/drivers/pci/probe.c
@@ -692,6 +692,9 @@ static void pci_read_irq(struct pci_dev
* Returns 0 on success and -1 if unknown type of device (not normal, bridge
* or CardBus).
*/
+
+#define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
+
static int pci_setup_device(struct pci_dev * dev)
{
u32 class;
@@ -735,18 +738,18 @@ static int pci_setup_device(struct pci_d
if ((progif & 1) == 0) {
dev->resource[0].start = 0x1F0;
dev->resource[0].end = 0x1F7;
- dev->resource[0].flags = IORESOURCE_IO;
+ dev->resource[0].flags = LEGACY_IO_RESOURCE;
dev->resource[1].start = 0x3F6;
dev->resource[1].end = 0x3F6;
- dev->resource[1].flags = IORESOURCE_IO;
+ dev->resource[1].flags = LEGACY_IO_RESOURCE;
}
if ((progif & 4) == 0) {
dev->resource[2].start = 0x170;
dev->resource[2].end = 0x177;
- dev->resource[2].flags = IORESOURCE_IO;
+ dev->resource[2].flags = LEGACY_IO_RESOURCE;
dev->resource[3].start = 0x376;
dev->resource[3].end = 0x376;
- dev->resource[3].flags = IORESOURCE_IO;
+ dev->resource[3].flags = LEGACY_IO_RESOURCE;
}
}
break;
diff -puN drivers/pci/setup-res.c~pci-legacy-resource-fix drivers/pci/setup-res.c
--- a/drivers/pci/setup-res.c~pci-legacy-resource-fix
+++ a/drivers/pci/setup-res.c
@@ -38,6 +38,13 @@ pci_update_resource(struct pci_dev *dev,
if (!res->flags)
return;
+ /* Ignore non-moveable resources. This might be legacy resources for
+ which no functional BAR register exists or another important
+ system resource we should better not move around in system address
+ space. */
+ if (res->flags & IORESOURCE_PCI_FIXED)
+ return;
+
pcibios_resource_to_bus(dev, ®ion, res);
pr_debug(" got res [%llx:%llx] bus [%lx:%lx] flags %lx for "
@@ -212,6 +219,10 @@ pdev_sort_resources(struct pci_dev *dev,
resource_size_t r_align;
r = &dev->resource[i];
+
+ if (r->flags & IORESOURCE_PCI_FIXED)
+ continue;
+
r_align = r->end - r->start;
if (!(r->flags) || r->parent)
diff -puN include/linux/ioport.h~pci-legacy-resource-fix include/linux/ioport.h
--- a/include/linux/ioport.h~pci-legacy-resource-fix
+++ a/include/linux/ioport.h
@@ -91,6 +91,9 @@ struct resource_list {
#define IORESOURCE_ROM_COPY (1<<2) /* ROM is alloc'd copy, resource field overlaid */
#define IORESOURCE_ROM_BIOS_COPY (1<<3) /* ROM is BIOS copy, resource field overlaid */
+/* PCI control bits. Shares IORESOURCE_BITS with above PCI ROM. */
+#define IORESOURCE_PCI_FIXED (1<<4) /* Do not move resource */
+
/* PC/ISA/whatever - the normal PC address spaces: IO and memory */
extern struct resource ioport_resource;
extern struct resource iomem_resource;
_
Patches currently in -mm which might be from ralf@xxxxxxxxxxxxxx are
origin.patch
export-pm_suspend-for-the-shared-apm-emulation.patch
add-struct-dev-pointer-to-dma_is_consistent.patch
pass-struct-dev-pointer-to-dma_cache_sync.patch
futex-remove-unneeded-barrier.patch
mips-dbg_io-stray-brackets-fix.patch
mmc-fix-syntax-error.patch
git-mtd.patch
git-netdev-all.patch
pci-legacy-resource-fix.patch
generic-ioremap_page_range-mips-conversion.patch
-
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