[Xen-devel] [PATCH V9 4/7] libxl: add libxl_device_usb_assignable_list API

[Chunyan Liu <cyliu@xxxxxxxx>]

Add API for listing assignable USB devices info.
Assignable USB device means the USB device type is assignable and
it's not assigned to any guest yet.

Signed-off-by: Chunyan Liu <cyliu@xxxxxxxx>

---
This could be squashed with previous patch. Split because there is
some dispute on this. If this is acceptable, could be squashed,
otherwise could be removed.

 tools/libxl/libxl.h       |  3 +++
 tools/libxl/libxl_pvusb.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+)

diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index 594e23d..7548b6a 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -1472,6 +1472,9 @@ int libxl_device_usbctrl_getinfo(libxl_ctx *ctx, uint32_t 
domid,
                                  libxl_usbctrlinfo *usbctrlinfo);
 
 /* USB Devices */
+libxl_device_usb *
+libxl_device_usb_assignable_list(libxl_ctx *ctx, int *num);
+
 int libxl_device_usb_add(libxl_ctx *ctx, uint32_t domid, libxl_device_usb *usb,
                          const libxl_asyncop_how *ao_how)
                          LIBXL_EXTERNAL_CALLERS_ONLY;
diff --git a/tools/libxl/libxl_pvusb.c b/tools/libxl/libxl_pvusb.c
index 96b41e6..5d6d348 100644
--- a/tools/libxl/libxl_pvusb.c
+++ b/tools/libxl/libxl_pvusb.c
@@ -591,6 +591,67 @@ static bool is_usb_assignable(libxl__gc *gc, 
libxl_device_usb *usb)
     return classcode != USBHUB_CLASS_CODE;
 }
 
+libxl_device_usb *
+libxl_device_usb_assignable_list(libxl_ctx *ctx, int *num)
+{
+    GC_INIT(ctx);
+    libxl_device_usb *usbs = NULL;
+    libxl_device_usb *assigned;
+    int num_assigned;
+    DIR *dir;
+    int r;
+
+    *num = 0;
+
+    r = get_assigned_devices(gc, &assigned, &num_assigned);
+    if (r) {
+        LOG(ERROR, "cannot determine if device is assigned");
+        goto out;
+    }
+
+    dir = opendir(SYSFS_USB_DEV);
+    if (!dir) goto out;
+
+    size_t need = offsetof(struct dirent, d_name) +
+        pathconf(SYSFS_USB_DEV, _PC_NAME_MAX) + 1;
+    struct dirent *de_buf = libxl__zalloc(gc, need);
+    struct dirent *de;
+
+    while (readdir_r(dir, de_buf, &de) == 0 && de != NULL) {
+        libxl_device_usb *usb;
+        uint8_t bus, addr;
+
+        if (!strcmp(de->d_name, ".") ||
+            !strcmp(de->d_name, ".."))
+            continue;
+
+        if (usb_busaddr_from_busid(gc, de->d_name, &bus, &addr))
+            continue;
+
+        GCNEW(usb);
+        usb->u.hostdev.hostbus = bus;
+        usb->u.hostdev.hostaddr = addr;
+
+        if (!is_usb_assignable(gc, usb))
+            continue;
+
+        if (is_usbdev_in_array(assigned, num_assigned, usb))
+            continue;
+
+        usbs = libxl__realloc(NOGC, usbs, sizeof(*usbs) * (*num + 1));
+        libxl_device_usb_init(usbs + *num);
+        usbs[*num].u.hostdev.hostbus = bus;
+        usbs[*num].u.hostdev.hostaddr = addr;
+        (*num)++;
+    }
+
+    closedir(dir);
+
+out:
+    GC_FREE;
+    return usbs;
+}
+
 /* get usb devices under certain usb controller */
 static int
 libxl__device_usb_list_for_usbctrl(libxl__gc *gc, uint32_t domid,
-- 
2.1.4


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