linux-kernel - Re: [PATCH HACK] powerpc: quick hack to get a functional eHEA with hardirq preemption, eHCA is close

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Message-Id: <200809231743.23828.ossthema@de.ibm.com>
Date:	Tue, 23 Sep 2008 17:43:23 +0200
From:	Jan-Bernd Themann <ossthema@...ibm.com>
To:	Sebastien Dugue <sebastien.dugue@...l.net>
Cc:	Christoph Raisch <RAISCH@...ibm.com>,
	Benjamin Herrenschmidt <bherren@....ibm.com>,
	gilles.carry@....bull.net, Jan-Bernd Themann <THEMANN@...ibm.com>,
	jean-pierre.dion@...l.net,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Linux-rt <linux-rt-users@...r.kernel.org>,
	linux-ppc <linuxppc-dev@...abs.org>, netdev@...r.kernel.org,
	Thomas Q Klein <TKLEIN@...ibm.com>, tinytim@...ibm.com,
	Hoang-Nam Nguyen <HNGUYEN@...ibm.com>
Subject: Re: [PATCH HACK] powerpc: quick hack to get a functional eHEA with hardirq preemption, eHCA is close

Hi,

I think these are the "functional" changes that need to be included in
the ibmebus driver. We'll add a RT flag in the final version to enable
these changes only for RT-Linux for now. 
Ben, can you / your team look into the implementation
of the set_irq_type functionality needed for XICS?

Regards,
Jan-Bernd & Christoph

diff -Nurp b/arch/powerpc/kernel/ibmebus.c a/arch/powerpc/kernel/ibmebus.c
--- b/arch/powerpc/kernel/ibmebus.c	2008-09-22 00:29:55.000000000 +0200
+++ a/arch/powerpc/kernel/ibmebus.c	2008-09-23 12:04:53.000000000 +0200
@@ -216,12 +216,16 @@ int ibmebus_request_irq(u32 ist, irq_han
 			unsigned long irq_flags, const char *devname,
 			void *dev_id)
 {
+	int ret;
 	unsigned int irq = irq_create_mapping(NULL, ist);
 
 	if (irq == NO_IRQ)
 		return -EINVAL;
 
-	return request_irq(irq, handler, irq_flags, devname, dev_id);
+	ret = request_irq(irq, handler, irq_flags, devname, dev_id);
+	set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
+
+	return ret;
 }
 EXPORT_SYMBOL(ibmebus_request_irq);
 


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