PCI: Increase IBM ipr SAS Crocodile BARs to at least system page size

commit 9fe373f9997b48fcd6222b95baf4a20c134b587a upstream.

The Crocodile chip occasionally comes up with 4k and 8k BAR sizes.  Due to
an erratum, setting the SR-IOV page size causes the physical function BARs
to expand to the system page size.  Since ppc64 uses 64k pages, when Linux
tries to assign the smaller resource sizes to the now 64k BARs the address
will be truncated and the BARs will overlap.

Force Linux to allocate the resource as a full page, which avoids the
overlap.

[bhelgaas: print expanded resource, too]
Signed-off-by: Douglas Lehr <dllehr@us.ibm.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Milton Miller <miltonm@us.ibm.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 3af18b94d0d329b6fddda480fb6d9c5d16d91d9b..a7b7eeaf35e870f4a4ed499cc7c2f12bd94e3f5a 100644 (file)
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -28,6 +28,7 @@
 #include <linux/ioport.h>
 #include <linux/sched.h>
 #include <linux/ktime.h>
+#include <linux/mm.h>
 #include <asm/dma.h>   /* isa_dma_bridge_buggy */
 #include "pci.h"
 
@@ -291,6 +292,25 @@ static void quirk_citrine(struct pci_dev *dev)
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,    PCI_DEVICE_ID_IBM_CITRINE,      quirk_citrine);
 
+/*  On IBM Crocodile ipr SAS adapters, expand BAR to system page size */
+static void quirk_extend_bar_to_page(struct pci_dev *dev)
+{
+       int i;
+
+       for (i = 0; i < PCI_STD_RESOURCE_END; i++) {
+               struct resource *r = &dev->resource[i];
+
+               if (r->flags & IORESOURCE_MEM && resource_size(r) < PAGE_SIZE) {
+                       r->end = PAGE_SIZE - 1;
+                       r->start = 0;
+                       r->flags |= IORESOURCE_UNSET;
+                       dev_info(&dev->dev, "expanded BAR %d to page size: %pR\n",
+                                i, r);
+               }
+       }
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, 0x034a, quirk_extend_bar_to_page);
+
 /*
  *  S3 868 and 968 chips report region size equal to 32M, but they decode 64M.
  *  If it's needed, re-allocate the region.