On 2015年05月26日 23:44, Boris Ostrovsky wrote:
On 05/26/2015 10:54 AM, Tomasz Nowicki wrote:
On 26.05.2015 16:00, Boris Ostrovsky wrote:
On 05/26/2015 09:54 AM, Boris Ostrovsky wrote:
On 05/26/2015 08:49 AM, Hanjun Guo wrote:
In drivers/xen/pci.c, there are arch x86 dependent codes when
CONFIG_PCI_MMCONFIG is enabled, since CONFIG_PCI_MMCONFIG
depends on ACPI, so this will prevent XEN PCI running on other
architectures using ACPI with PCI_MMCONFIG enabled (such as ARM64).
Fortunatly, it can be sloved in a simple way. In drivers/xen/pci.c,
the only x86 dependent code is if ((pci_probe & PCI_PROBE_MMCONF) ==
0),
and it's defined in asm/pci_x86.h, the code means that
if the PCI resource is not probed in PCI_PROBE_MMCONF way, just
ingnore the xen mcfg init. Actually this is duplicate, because
if PCI resource is not probed in PCI_PROBE_MMCONF way, the
pci_mmconfig_list will be empty, and the if (list_empty())
after it will do the same job.
So just remove the arch related code and the head file, this
will be no functional change for x86, and also makes xen/pci.c
usable for other architectures.
Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
CC: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
CC: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
drivers/xen/pci.c | 6 ------
1 file changed, 6 deletions(-)
diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c
index 6785ebb..9a8dbe3 100644
--- a/drivers/xen/pci.c
+++ b/drivers/xen/pci.c
@@ -28,9 +28,6 @@
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
#include "../pci/pci.h"
-#ifdef CONFIG_PCI_MMCONFIG
-#include <asm/pci_x86.h>
-#endif
static bool __read_mostly pci_seg_supported = true;
@@ -222,9 +219,6 @@ static int __init xen_mcfg_late(void)
if (!xen_initial_domain())
return 0;
- if ((pci_probe & PCI_PROBE_MMCONF) == 0)
- return 0;
-
if (list_empty(&pci_mmcfg_list))
return 0;
(+Stefano who is Xen ARM maintainer)
This will not build on x86 since pci_mmcfg_list since, for example,
pci_mmcfg_list is declared in pci_x86.h.
And now really with Stefano and with parsable first sentence, sorry:
This will not build on x86 since pci_mmcfg_list, for example, is
declared in pci_x86.h.
With this patch set, not any more. Please see preceding patches.
OK, I didn't notice this was part of a series.
Sorry, I didn't cc you all of those patches.
Then if not having PCI_PROBE_MMCONF bit set is indeed equivalent to
list_empty(&pci_mmcfg_list), is there any reason for this flag to
(continue to) exist? (and also for pci_mmcfg_arch_init_failed.)
I think PCI_PROBE_MMCONF bit is needed for early init of pci mmconfig in
the x86 arch related code, but for xen_mcfg_late(), it's called after
acpi_init() which the mmconfig is ready for use if it's available (the
pci_mmcfg_list is empty or not), so not having PCI_PROBE_MMCONF bit set
is equivalent list_empty(&pci_mmcfg_list) is not suitable for all cases,
but I think it will be ok after mmconfig is initialized.
I think my change log is misleading and needs updating :)
Thanks
Hanjun
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