diff options
| author | Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> | 2018-05-14 08:27:40 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2018-05-16 12:59:50 +0200 |
| commit | d6e0fbb82e73a01e4cb3631b8b3dd7aae09ab14c (patch) | |
| tree | 3b25bbd880692a6db4b44a0e2ab9c0a249939828 /sound/xen/xen_snd_front.c | |
| parent | ALSA: xen-front: Implement Xen event channel handling (diff) | |
| download | linux-d6e0fbb82e73a01e4cb3631b8b3dd7aae09ab14c.tar.xz linux-d6e0fbb82e73a01e4cb3631b8b3dd7aae09ab14c.zip | |
ALSA: xen-front: Implement handling of shared buffers
Implement shared buffer handling according to the
para-virtualized sound device protocol at xen/interface/io/sndif.h:
- manage buffer memory
- handle granted references
- handle page directories
[ Fixed missing linux/kernel.h inclusion -- tiwai ]
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/xen/xen_snd_front.c')
| -rw-r--r-- | sound/xen/xen_snd_front.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sound/xen/xen_snd_front.c b/sound/xen/xen_snd_front.c index 277214d4fd0a..cdf66ea516c4 100644 --- a/sound/xen/xen_snd_front.c +++ b/sound/xen/xen_snd_front.c @@ -11,6 +11,7 @@ #include <linux/delay.h> #include <linux/module.h> +#include <xen/page.h> #include <xen/platform_pci.h> #include <xen/xen.h> #include <xen/xenbus.h> @@ -191,6 +192,13 @@ static int __init xen_drv_init(void) if (!xen_has_pv_devices()) return -ENODEV; + /* At the moment we only support case with XEN_PAGE_SIZE == PAGE_SIZE */ + if (XEN_PAGE_SIZE != PAGE_SIZE) { + pr_err(XENSND_DRIVER_NAME ": different kernel and Xen page sizes are not supported: XEN_PAGE_SIZE (%lu) != PAGE_SIZE (%lu)\n", + XEN_PAGE_SIZE, PAGE_SIZE); + return -ENODEV; + } + pr_info("Initialising Xen " XENSND_DRIVER_NAME " frontend driver\n"); return xenbus_register_frontend(&xen_driver); } |