pcifront: implement dynamic connections and disconnections

this patch implements dynamic connections and disconnections in
pcifront.
This feature is required to properly support pci hotplug, because when
no pci devices are assigned to a guest, xend will remove the pci
backend altogether.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

diff --git a/pciutils.patch b/pciutils.patch
index 0190428f269b1f206dcb216e12d26ef7adfc1001..2147ad4aecf87b637ddc7175f90600f1fb06cf81 100644 (file)
--- a/pciutils.patch
+++ b/pciutils.patch
@@ -23,14 +23,6 @@ diff -urN pciutils-2.2.9.orig/lib/access.c pciutils-2.2.9/lib/access.c
    PCI_ACCESS_MAX
  };
  
-@@ -63,6 +64,7 @@
-   int fd_rw;                          /* proc: fd opened read-write */
-   struct pci_dev *cached_dev;         /* proc: device the fd is for */
-   int fd_pos;                         /* proc: current position */
-+  void *minios;
- };
- 
- /* Initialize PCI access */
 --- pciutils-2.2.9.orig/lib/internal.h 2006-09-09 11:52:47.000000000 +0100
 +++ pciutils-2.2.9/lib/internal.h      2008-07-01 10:46:24.968202000 +0100
 @@ -37,4 +37,4 @@
@@ -95,24 +87,19 @@ diff -urN pciutils-2.2.9.orig/lib/access.c pciutils-2.2.9/lib/access.c
 +static void
 +minios_init(struct pci_access *a)
 +{
-+  a->minios = init_pcifront(NULL);
-+  if (!a->minios)
++  if (!init_pcifront(NULL))
 +    a->warning("minios_init open failed");
 +}
 +
 +static void
 +minios_cleanup(struct pci_access *a)
 +{
-+  if (a->minios)
-+    shutdown_pcifront(a->minios);
++  shutdown_pcifront(NULL);
 +}
 +
 +static void
 +minios_scan(struct pci_access *a)
 +{
-+  if (!a->minios)
-+    return;
-+
 +  void func(unsigned int domain, unsigned int bus, unsigned int slot, unsigned int fun)
 +  {
 +    struct pci_dev *d = pci_alloc_dev(a);
@@ -125,7 +112,7 @@ diff -urN pciutils-2.2.9.orig/lib/access.c pciutils-2.2.9/lib/access.c
 +    pci_link_dev(a, d);
 +  }
 +
-+  pcifront_scan(a->minios, func);
++  pcifront_scan(NULL, func);
 +}
 +
 +static int
@@ -134,17 +121,17 @@ diff -urN pciutils-2.2.9.orig/lib/access.c pciutils-2.2.9/lib/access.c
 +  unsigned int val;
 +  switch (len) {
 +    case 1:
-+      if (pcifront_conf_read(d->access->minios, d->domain, d->bus, d->dev, d->func, pos, len, &val))
++      if (pcifront_conf_read(NULL, d->domain, d->bus, d->dev, d->func, pos, len, &val))
 +        return 0;
 +      * buf = val;
 +      return 1;
 +    case 2:
-+      if (pcifront_conf_read(d->access->minios, d->domain, d->bus, d->dev, d->func, pos, len, &val))
++      if (pcifront_conf_read(NULL, d->domain, d->bus, d->dev, d->func, pos, len, &val))
 +        return 0;
 +      *(u16 *) buf = cpu_to_le16((u16) val);
 +      return 1;
 +    case 4:
-+      if (pcifront_conf_read(d->access->minios, d->domain, d->bus, d->dev, d->func, pos, len, &val))
++      if (pcifront_conf_read(NULL, d->domain, d->bus, d->dev, d->func, pos, len, &val))
 +        return 0;
 +      *(u32 *) buf = cpu_to_le32((u32) val);
 +      return 1;
@@ -170,7 +157,7 @@ diff -urN pciutils-2.2.9.orig/lib/access.c pciutils-2.2.9/lib/access.c
 +    default:
 +      return pci_generic_block_write(d, pos, buf, len);
 +  }
-+  return !pcifront_conf_write(d->access->minios, d->domain, d->bus, d->dev, d->func, pos, len, val);
++  return !pcifront_conf_write(NULL, d->domain, d->bus, d->dev, d->func, pos, len, val);
 +}
 +
 +struct pci_methods pm_minios = {