[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v4 02/13] libxl: add generic functions to get and free device list
From: Oleksandr Grytsov <oleksandr_grytsov@xxxxxxxx> Add libxl__device_list and libxl__device_list_free functions to handle device list using the device framework. Signed-off-by: Oleksandr Grytsov <oleksandr_grytsov@xxxxxxxx> --- tools/libxl/libxl_device.c | 66 ++++++++++++++++++++++++++++++++++++++++++++ tools/libxl/libxl_internal.h | 8 ++++++ 2 files changed, 74 insertions(+) diff --git a/tools/libxl/libxl_device.c b/tools/libxl/libxl_device.c index 07165f0..f1d4848 100644 --- a/tools/libxl/libxl_device.c +++ b/tools/libxl/libxl_device.c @@ -1991,6 +1991,72 @@ out: return rc; } +void *libxl__device_list(libxl__gc *gc, const struct libxl_device_type *dt, + uint32_t domid, const char* name, int *num) +{ + void *r = NULL; + void *list = NULL; + void *item = NULL; + char *libxl_path; + char **dir = NULL; + unsigned int ndirs = 0; + int rc; + + *num = 0; + + libxl_path = GCSPRINTF("%s/device/%s", + libxl__xs_libxl_path(gc, domid), name); + + dir = libxl__xs_directory(gc, XBT_NULL, libxl_path, &ndirs); + + if (dir && ndirs) { + list = libxl__malloc(NOGC, dt->dev_elem_size * ndirs); + void *end = (uint8_t *)list + ndirs * dt->dev_elem_size; + item = list; + + while (item < end) { + dt->init(item); + + if (dt->from_xenstore) { + char* device_libxl_path = GCSPRINTF("%s/%s", libxl_path, *dir); + rc = dt->from_xenstore(gc, device_libxl_path, atoi(*dir), item); + if (rc) goto out; + } + + item = (uint8_t*)item + dt->dev_elem_size; + ++dir; + } + } + + *num = ndirs; + r = list; + list = NULL; + +out: + + if (list) { + *num = 0; + while(item >= list) { + dt->dispose(item); + item = (uint8_t*)item - dt->dev_elem_size; + } + free(list); + } + + return r; +} + +void libxl__device_list_free(const struct libxl_device_type *dt, + void *list, int num) +{ + int i; + + for (i = 0; i < num; i++) + dt->dispose((uint8_t*)list + i * dt->dev_elem_size); + + free(list); +} + /* * Local variables: * mode: C diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h index 075dfe3..271ac89 100644 --- a/tools/libxl/libxl_internal.h +++ b/tools/libxl/libxl_internal.h @@ -3506,6 +3506,7 @@ struct libxl_device_type { int (*dm_needed)(void *, unsigned); void (*update_config)(libxl__gc *, void *, void *); int (*update_devid)(libxl__gc *, uint32_t, void *); + int (*from_xenstore)(libxl__gc *, const char *, libxl_devid, void *); int (*set_xenstore_config)(libxl__gc *, uint32_t, void *, flexarray_t *, flexarray_t *, flexarray_t *); }; @@ -4386,6 +4387,13 @@ void libxl__device_add_async(libxl__egc *egc, uint32_t domid, int libxl__device_add(libxl__gc *gc, uint32_t domid, const struct libxl_device_type *dt, void *type); +/* Caller is responsible for freeing the memory by calling + * libxl__device_list_free + */ +void* libxl__device_list(libxl__gc *gc, const struct libxl_device_type *dt, + uint32_t domid, const char* name, int *num); +void libxl__device_list_free(const struct libxl_device_type *dt, + void *list, int num); #endif /* -- 2.7.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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