[PATCH 06/10] x86/PCI: Enable scanning of all pci functions

Jeremy Fitzhardinge
2009-05-27T07:27:44Z

From: Alex Nixon <alex.nixon@citrix.com>

Xen may want to enable scanning of all pci functions - if for example
the device at function 0 is not passed through to the guest, but the
device at function 1 is.

Jesse objected to the "#undef pcibios_scan_all_fns"'s ugliness,
so replace it with the more common HAVE_ARCH_ idiom.

[ Impact: allow passthrough of just some PCI functions. ]

Signed-off-by: Alex Nixon <alex.nixon@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Reviewed-by: "H. Peter Anvin" <hpa@zytor.com>
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
arch/x86/include/asm/pci.h | 8 +++++++-
arch/x86/pci/common.c | 1 +
include/asm-generic/pci.h | 2 ++
3 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index b51a1e8..cabea93 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -21,6 +21,7 @@ struct pci_sysdata {
extern int pci_routeirq;
extern int noioapicquirk;
extern int noioapicreroute;
+extern int pci_scan_all_fns;

/* scan a bus after allocating a pci_sysdata for it */
extern struct pci_bus *pci_scan_bus_on_node(int busno, struct pci_ops *ops,
@@ -48,7 +49,11 @@ extern unsigned int pcibios_assign_all_busses(void);
#else
#define pcibios_assign_all_busses() 0
#endif
-#define pcibios_scan_all_fns(a, b) 0
+
+static inline int pcibios_scan_all_fns(struct pci_bus *bus, int devfn)
+{
+ return pci_scan_all_fns;
+}

extern unsigned long pci_mem_start;
#define PCIBIOS_MIN_IO 0x1000
@@ -129,6 +134,7 @@ extern void pci_iommu_alloc(void);
#include <asm-generic/pci-dma-compat.h>

/* generic pci stuff */
+#define HAVE_ARCH_PCIBIOS_SCAN_ALL_FNS
#include <asm-generic/pci.h>

#ifdef CONFIG_NUMA
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 011ff45..6a522c2 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -22,6 +22,7 @@ unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
unsigned int pci_early_dump_regs;
static int pci_bf_sort;
int pci_routeirq;
+int pci_scan_all_fns;
int noioapicquirk;
#ifdef CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS
int noioapicreroute = 0;
diff --git a/include/asm-generic/pci.h b/include/asm-generic/pci.h
index c36a77d..9ad9cb7 100644
--- a/include/asm-generic/pci.h
+++ b/include/asm-generic/pci.h
@@ -43,7 +43,9 @@ pcibios_select_root(struct pci_dev *pdev, struct resource *res)
return root;
}

+#ifndef HAVE_ARCH_PCIBIOS_SCAN_ALL_FNS
#define pcibios_scan_all_fns(a, b) 0
+#endif

#ifndef HAVE_ARCH_PCI_GET_LEGACY_IDE_IRQ
static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
--
1.6.0.6