On 2 February 2011 22:12, Miklos Aubert <miklos.aubert@xxxxxxxxx> wrote:
> Hello fellow RT users,
>
> I've built a 2.6.33.7 kernel with the RT patch and the Nouveau driver
> enabled, but Xorg doesn't start.
>
> Using the _same_ configuration and removing the RT patch (vanilla
> kernel from kernel.org), Xorg works.
>
> Booting with drm.debug=1, and comparing the kernel logs, I find that
> the RT kernel seems to be having trouble here :
>
> [ 31.651720] [drm:drm_ioctl], pid=1904, cmd=0x6440, nr=0x40, dev
> 0xe200, auth=1
> [ 31.651724] [drm:drm_ioctl], no function
> [ 31.651726] [drm:drm_ioctl], ret = ffffffea
I finally got it to work! By trial and error, I found out that this
ioctl call is actually "NOUVEAU_CARD_INIT", which is defined in the
vanilla 2.6.33 kernel, but removed by the RT patch.
Not really understanding what I was doing, I tried putting this ioctl
back and came up with the patch included at the bottom of this mail.
Amazingly, it works!
I think the only reason I need this ioctl is because I'm running
Debian sid, and the current Xorg Nouveau driver wants it. When I try
linking libdrm_nouveau.so.1 to a version found in the libdrm_nouveau1a
package, the ioctl is not used, according to the dmesg. So the problem
should disappear in the next couple of updates. By then I hope a new
RT patch will be out with a newer kernel and Nouveau 0.0.16 :)
--- a/drivers/gpu/drm/nouveau/nouveau_channel.c 2011-02-03
20:17:10.000000000 +0100
+++ b/drivers/gpu/drm/nouveau/nouveau_channel.c 2011-02-03
17:07:47.000000000 +0100
@@ -408,6 +408,7 @@
***********************************/
struct drm_ioctl_desc nouveau_ioctls[] = {
+ DRM_IOCTL_DEF_DRV(NOUVEAU_CARD_INIT, nouveau_ioctl_card_init, DRM_AUTH),
DRM_IOCTL_DEF_DRV(NOUVEAU_GETPARAM, nouveau_ioctl_getparam, DRM_AUTH),
DRM_IOCTL_DEF_DRV(NOUVEAU_SETPARAM, nouveau_ioctl_setparam,
DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
DRM_IOCTL_DEF_DRV(NOUVEAU_CHANNEL_ALLOC, nouveau_ioctl_fifo_alloc, DRM_AUTH),
--- a/include/drm/nouveau_drm.h 2011-02-03 20:17:49.000000000 +0100
+++ b/include/drm/nouveau_drm.h 2011-02-03 17:20:52.000000000 +0100
@@ -200,6 +200,10 @@
struct drm_nouveau_sarea {
};
+struct drm_nouveau_card_init {
+ uint32_t handle;
+};
+
#define DRM_NOUVEAU_CARD_INIT 0x00
#define DRM_NOUVEAU_GETPARAM 0x01
#define DRM_NOUVEAU_SETPARAM 0x02
@@ -218,6 +222,7 @@
#define DRM_NOUVEAU_GEM_INFO 0x47
#define DRM_NOUVEAU_GEM_PUSHBUF_CALL2 0x48
+#define DRM_IOCTL_NOUVEAU_CARD_INIT
DRM_IOWR(DRM_COMMAND_BASE + DRM_NOUVEAU_CARD_INIT, struct
drm_nouveau_card_init)
#define DRM_IOCTL_NOUVEAU_GETPARAM
DRM_IOWR(DRM_COMMAND_BASE + DRM_NOUVEAU_GETPARAM, struct
drm_nouveau_getparam)
#define DRM_IOCTL_NOUVEAU_SETPARAM
DRM_IOWR(DRM_COMMAND_BASE + DRM_NOUVEAU_SETPARAM, struct
drm_nouveau_setparam)
#define DRM_IOCTL_NOUVEAU_CHANNEL_ALLOC
DRM_IOWR(DRM_COMMAND_BASE + DRM_NOUVEAU_CHANNEL_ALLOC, struct
drm_nouveau_channel_alloc)
--
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