Re: [proaudio] Nvidia drivers with RT kernel

[Arve Barsnes <arve.barsnes@xxxxxxxxx>]

To get it working, simply add the following to your ebuild in the
src_prepare() section:

# Add fix for later RT kernels
epatch "${FILESDIR}"/256.44-rt-fix.patch

And then create the files/256.44-rt-fix.patch file with the following content:

diff --git a/kernel/nv-linux.h b/kernel/nv-linux.h
index 3ba43e7..e95460a 100644
--- a/kernel/nv-linux.h
+++ b/kernel/nv-linux.h
@@ -218,16 +218,16 @@ extern int nv_pat_mode;
 #endif

 #if defined(CONFIG_PREEMPT_RT)
-typedef atomic_spinlock_t         nv_spinlock_t;
-#define NV_SPIN_LOCK_INIT(lock)   atomic_spin_lock_init(lock)
-#define NV_SPIN_LOCK_IRQ(lock)    atomic_spin_lock_irq(lock)
-#define NV_SPIN_UNLOCK_IRQ(lock)  atomic_spin_unlock_irq(lock)
-#define NV_SPIN_LOCK_IRQSAVE(lock,flags) atomic_spin_lock_irqsave(lock,flags)
+typedef raw_spinlock_t         nv_spinlock_t;
+#define NV_SPIN_LOCK_INIT(lock)   raw_spin_lock_init(lock)
+#define NV_SPIN_LOCK_IRQ(lock)    raw_spin_lock_irq(lock)
+#define NV_SPIN_UNLOCK_IRQ(lock)  raw_spin_unlock_irq(lock)
+#define NV_SPIN_LOCK_IRQSAVE(lock,flags) raw_spin_lock_irqsave(lock,flags)
 #define NV_SPIN_UNLOCK_IRQRESTORE(lock,flags) \
-  atomic_spin_unlock_irqrestore(lock,flags)
-#define NV_SPIN_LOCK(lock)        atomic_spin_lock(lock)
-#define NV_SPIN_UNLOCK(lock)      atomic_spin_unlock(lock)
-#define NV_SPIN_UNLOCK_WAIT(lock) atomic_spin_unlock_wait(lock)
+  raw_spin_unlock_irqrestore(lock,flags)
+#define NV_SPIN_LOCK(lock)        raw_spin_lock(lock)
+#define NV_SPIN_UNLOCK(lock)      raw_spin_unlock(lock)
+#define NV_SPIN_UNLOCK_WAIT(lock) raw_spin_unlock_wait(lock)
 #else
 typedef spinlock_t                nv_spinlock_t;
 #define NV_SPIN_LOCK_INIT(lock)   spin_lock_init(lock)
@@ -791,7 +791,7 @@ static inline int nv_execute_on_all_cpus(void
(*func)(void *info), void *info)
 }

 #if defined(CONFIG_PREEMPT_RT)
-#define NV_INIT_MUTEX(mutex) semaphore_init(mutex)
+#define NV_INIT_MUTEX(mutex) sema_init(mutex,1)
 #else
 #if !defined(__SEMAPHORE_INITIALIZER) &&
defined(__COMPAT_SEMAPHORE_INITIALIZER)
 #define __SEMAPHORE_INITIALIZER __COMPAT_SEMAPHORE_INITIALIZER
--
1.7.2.1


Hopefully anyone's e-mail prog won't screw up the lines on that one.
Of course, if you want to add this to your personal overlay, your
files directory will need to contain a bunch of other files as well,
but I'll leave the details of that up to you ;)


On 26 October 2010 13:37, Allan Klinbail <sonofzev@xxxxxxxxxxxx> wrote:
> I would love to get this working too!!
>
> (Although I find latency on the gentoo-sources not to be of a problem
> but it can always be better )...
>
>
> On Sun, 2010-10-24 at 18:23 +0200, Arve Barsnes wrote:
>> I have this working here, let me know if you need it.
>>
>> On 24 October 2010 15:38, Alex Montgomery <apmontgomery@xxxxxxxxx> wrote:
>> > Hello,
>> >
>> > I've been avoiding doing a deep update since the latest nvidia drivers
>> > have known issues with the RT kernels. However I ran across this
>> > thread which talks about a working patch that might be maintained by
>> > the pro-audio overlay:
>> > http://forums.gentoo.org/viewtopic-p-6455967.html?sid=0ae783b568222fd063e0e7da6e47253f
>> >
>> > it references this bug:
>> > http://bugs.gentoo.org/show_bug.cgi?id=308945
>> >
>> > So basically it looks like there is a working patch for the Nvidia
>> > drivers to compile against the rt-kernel in the overlay, but the patch
>> > and fixed ebuild are just sitting on some guy's overlay. Would it be
>> > possible to integrate this into the pro-audio overlay?
>> >
>> > Cheers,
>> > -- Alex
>> >
>> >
>> >
>>
>>
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