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authorChris Wright <chrisw@sous-sol.org>2009-12-04 12:15:21 -0800
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-12-04 16:19:24 -0800
commit5d990b627537e59a3a2f039ff588a4750e9c1a6a (patch)
tree8c0e723c3f9146da52b30c087a80fc417df2b41b /arch/x86/xen
parentb26a34aa4792b3db2500b8a98cb7702765c1a92e (diff)
PCI: add pci_request_acs
Commit ae21ee65e8bc228416bbcc8a1da01c56a847a60c "PCI: acs p2p upsteram forwarding enabling" doesn't actually enable ACS. Add a function to pci core to allow an IOMMU to request that ACS be enabled. The existing mechanism of using iommu_found() in the pci core to know when ACS should be enabled doesn't actually work due to initialization order; iommu has only been detected not initialized. Have Intel and AMD IOMMUs request ACS, and Xen does as well during early init of dom0. Cc: Allen Kay <allen.m.kay@intel.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'arch/x86/xen')
-rw-r--r--arch/x86/xen/enlighten.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 5bccd706232..e2511bccbc8 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -27,6 +27,7 @@
#include <linux/page-flags.h>
#include <linux/highmem.h>
#include <linux/console.h>
+#include <linux/pci.h>
#include <xen/xen.h>
#include <xen/interface/xen.h>
@@ -1170,7 +1171,11 @@ asmlinkage void __init xen_start_kernel(void)
add_preferred_console("xenboot", 0, NULL);
add_preferred_console("tty", 0, NULL);
add_preferred_console("hvc", 0, NULL);
+ } else {
+ /* Make sure ACS will be enabled */
+ pci_request_acs();
}
+
xen_raw_console_write("about to get started...\n");