[Xen-devel] [PATCH v11 10/12] vpci: add a priority parameter to the vPCI register initializer

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

This is needed for MSI-X, since MSI-X will need to be initialized
before parsing the BARs, so that the header BAR handlers are aware of
the MSI-X related holes and make sure they are not mapped in order for
the trap handlers to work properly.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Julien Grall <julien.grall@xxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
Changes since v4:
 - Add a middle priority and add the PCI header to it.

Changes since v3:
 - Add a numerial suffix to the section used to store the pointer to
   each initializer function, and sort them at link time.
---
 xen/arch/arm/xen.lds.S    | 4 ++--
 xen/arch/x86/xen.lds.S    | 4 ++--
 xen/drivers/vpci/header.c | 2 +-
 xen/drivers/vpci/msi.c    | 2 +-
 xen/include/xen/vpci.h    | 8 ++++++--
 5 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/xen/arch/arm/xen.lds.S b/xen/arch/arm/xen.lds.S
index 49cae2af71..245a0e0e85 100644
--- a/xen/arch/arm/xen.lds.S
+++ b/xen/arch/arm/xen.lds.S
@@ -69,7 +69,7 @@ SECTIONS
 #if defined(CONFIG_HAS_VPCI) && defined(CONFIG_LATE_HWDOM)
        . = ALIGN(POINTER_ALIGN);
        __start_vpci_array = .;
-       *(.data.vpci)
+       *(SORT(.data.vpci.*))
        __end_vpci_array = .;
 #endif
   } :text
@@ -182,7 +182,7 @@ SECTIONS
 #if defined(CONFIG_HAS_VPCI) && !defined(CONFIG_LATE_HWDOM)
        . = ALIGN(POINTER_ALIGN);
        __start_vpci_array = .;
-       *(.data.vpci)
+       *(SORT(.data.vpci.*))
        __end_vpci_array = .;
 #endif
   } :text
diff --git a/xen/arch/x86/xen.lds.S b/xen/arch/x86/xen.lds.S
index 7bd6fb51c3..70afedd31d 100644
--- a/xen/arch/x86/xen.lds.S
+++ b/xen/arch/x86/xen.lds.S
@@ -139,7 +139,7 @@ SECTIONS
 #if defined(CONFIG_HAS_VPCI) && defined(CONFIG_LATE_HWDOM)
        . = ALIGN(POINTER_ALIGN);
        __start_vpci_array = .;
-       *(.data.vpci)
+       *(SORT(.data.vpci.*))
        __end_vpci_array = .;
 #endif
   } :text
@@ -246,7 +246,7 @@ SECTIONS
 #if defined(CONFIG_HAS_VPCI) && !defined(CONFIG_LATE_HWDOM)
        . = ALIGN(POINTER_ALIGN);
        __start_vpci_array = .;
-       *(.data.vpci)
+       *(SORT(.data.vpci.*))
        __end_vpci_array = .;
 #endif
   } :text
diff --git a/xen/drivers/vpci/header.c b/xen/drivers/vpci/header.c
index d7c220a452..8d9d6f43f3 100644
--- a/xen/drivers/vpci/header.c
+++ b/xen/drivers/vpci/header.c
@@ -535,7 +535,7 @@ static int init_bars(struct pci_dev *pdev)
 
     return (cmd & PCI_COMMAND_MEMORY) ? modify_bars(pdev, true, false) : 0;
 }
-REGISTER_VPCI_INIT(init_bars);
+REGISTER_VPCI_INIT(init_bars, VPCI_PRIORITY_MIDDLE);
 
 /*
  * Local variables:
diff --git a/xen/drivers/vpci/msi.c b/xen/drivers/vpci/msi.c
index c3c69ec453..de4ddf562e 100644
--- a/xen/drivers/vpci/msi.c
+++ b/xen/drivers/vpci/msi.c
@@ -267,7 +267,7 @@ static int init_msi(struct pci_dev *pdev)
 
     return 0;
 }
-REGISTER_VPCI_INIT(init_msi);
+REGISTER_VPCI_INIT(init_msi, VPCI_PRIORITY_LOW);
 
 void vpci_dump_msi(void)
 {
diff --git a/xen/include/xen/vpci.h b/xen/include/xen/vpci.h
index 116b93f519..7266c17679 100644
--- a/xen/include/xen/vpci.h
+++ b/xen/include/xen/vpci.h
@@ -15,9 +15,13 @@ typedef void vpci_write_t(const struct pci_dev *pdev, 
unsigned int reg,
 
 typedef int vpci_register_init_t(struct pci_dev *dev);
 
-#define REGISTER_VPCI_INIT(x)                   \
+#define VPCI_PRIORITY_HIGH      "1"
+#define VPCI_PRIORITY_MIDDLE    "5"
+#define VPCI_PRIORITY_LOW       "9"
+
+#define REGISTER_VPCI_INIT(x, p)                \
   static vpci_register_init_t *const x##_entry  \
-               __used_section(".data.vpci") = x
+               __used_section(".data.vpci." p) = x
 
 /* Add vPCI handlers to device. */
 int __must_check vpci_add_handlers(struct pci_dev *dev);
-- 
2.16.2


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