From: Roger Pau Monne <roger.pau@citrix.com>
Date: Fri, 23 Feb 2018 13:32:24 +0000 (+0000)
Subject: vpci: add a priority parameter to the vPCI register initializer
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=88f239aee2e7038069a7b6dca1809900ebdd4e99;p=people%2Froyger%2Fxen.git

vpci: add a priority parameter to the vPCI register initializer

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@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Julien Grall <julien.grall@arm.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Tim Deegan <tim@xen.org>
Cc: Wei Liu <wei.liu2@citrix.com>
---
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.
---

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 aab630499b..5d32cfcbba 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
@@ -237,7 +237,7 @@ 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 a7148504bd..4615f4a8f1 100644
--- a/xen/drivers/vpci/header.c
+++ b/xen/drivers/vpci/header.c
@@ -508,7 +508,7 @@ static int init_bars(struct pci_dev *pdev)
 
     return 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 fb85d09e08..0e5e817cd6 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 5afd54b2e8..6e810801d6 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);