From: Finn Thain <fthain@telegraphics.com.au>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Brad Boyer <flar@allandria.com>,
Linux/m68k <linux-m68k@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Linux Kernel Development <linux-kernel@vger.kernel.org>
Subject: Re: m68k: Convert to genirq (WIP)
Date: Wed, 10 Aug 2011 20:53:16 +1000 (EST) [thread overview]
Message-ID: <alpine.OSX.2.00.1108102007430.203@ibook.local> (raw)
In-Reply-To: <CAMuHMdXVt5+nCaCSH3+z0fsL+vhOOTgbKsOAses8OudT-1OZGQ@mail.gmail.com>
[-- Attachment #1: Type: TEXT/PLAIN, Size: 2650 bytes --]
On Wed, 10 Aug 2011, Geert Uytterhoeven wrote:
>
> While looking into optimizing interrupts using chain handlers (which
> cannot be shared), I noticed several of these cascades are hung on the
> same interrupt. Hence we cannot use the optimization of chain handlers
> for them.
>
> Knowing which are mutually exclusive helps a lot, but my Mac knowledge
> is very limited.
>
> I derived from the code this list of cascade handlers and the interrupts
> they use:
>
> baboon_irq
> IRQ_NUBUS_C
>
> oss_irq
> OSS_IRQLEV_SCSI = IRQ_AUTO_2 conflict: via2_irq
> OSS_IRQLEV_SOUND = IRQ_AUTO_5 conflict: psc_irq
PSC and OSS are mutually exclusive.
VIA2 and OSS are also mutually exlusive.
>
> oss_nubus_irq
> OSS_IRQLEV_NUBUS = IRQ_AUTO_3 conflict: psc_irq
>
> psc_irq
> IRQ_AUTO_3 conflict: oss_nubus_irq
> IRQ_AUTO_4
> IRQ_AUTO_5 conflict: oss_irq
> IRQ_AUTO_6 conflict: via1_irq
>
> via1_irq
> OSS_IRQLEV_VIA1 = IRQ_AUTO_6 (on oss) conflict: psc_irq
>
> IRQ_AUTO_1 conflict: iop_ism_irq
iop_ism_irq is only used with OSS.
> IRQ_AUTO_6 (if via_alt_mapping) conflict: psc_irq
via_alt_mapping is not used with PSC.
>
> via2_irq
> IRQ_AUTO_2 conflict: oss_irq
>
> via_nubus_irq
> IRQ_MAC_NUBUS = IRQ_VIA2_1
>
> These are other interrupts using in the Mac core code, which may use the same
> interrupts as some of the cascades above:
>
> iop_ism_irq
> OSS_IRQLEV_IOPISM = 1 = IRQ_AUTO_1 (on oss) conflict: via1_irq
via1_irq is remapped to IRQ_AUTO_6 on OSS.
> IRQ_VIA2_0 (on !oss)
>
> mac_nmi_handler
> IRQ_AUTO_7
>
> timer handler
> IRQ_MAC_TIMER_1 = IRQ_VIA1_6
>
> So baboon and PSC are mutually exclusive? But they don't conflict w.r.t. to
> interrupt lines anyway, so they're not an issue.
>
> From the code, OSS and VIA are also mutually exclusive (except for via1_irq)?
>
> But PSC can coexist with OSS? That's where most of the conflicts are.
Hope this helps...
Finn
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> -- Linus Torvalds
>
next prev parent reply other threads:[~2011-08-10 11:20 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-28 18:32 m68k: Convert to genirq (WIP) Geert Uytterhoeven
2011-05-31 8:35 ` Geert Uytterhoeven
2011-05-31 9:50 ` Thomas Gleixner
2011-05-31 19:54 ` Geert Uytterhoeven
2011-05-31 20:10 ` Thomas Gleixner
2011-06-03 11:20 ` Finn Thain
2011-06-03 11:33 ` Geert Uytterhoeven
2011-06-05 6:27 ` Brad Boyer
2011-06-05 7:45 ` Geert Uytterhoeven
2011-08-10 9:59 ` Geert Uytterhoeven
2011-08-10 10:53 ` Finn Thain [this message]
2011-08-10 16:19 ` Brad Boyer
2011-08-26 9:52 ` Geert Uytterhoeven
2011-08-26 11:21 ` Finn Thain
2011-08-26 11:32 ` Geert Uytterhoeven
2011-08-26 16:09 ` Brad Boyer
2011-06-04 17:56 ` Geert Uytterhoeven
2011-06-15 19:44 ` Geert Uytterhoeven
2011-06-16 19:30 ` Geert Uytterhoeven
2011-06-16 20:03 ` Thomas Gleixner
2011-06-17 3:45 ` Finn Thain
2011-06-17 5:01 ` Geert Uytterhoeven
2011-08-08 13:08 ` Geert Uytterhoeven
2011-08-10 10:48 ` Finn Thain
2011-06-16 19:45 ` Geert Uytterhoeven
2011-06-16 21:10 ` Michael Schmitz
2011-06-17 17:25 ` Andreas Schwab
2011-06-17 17:22 ` Andreas Schwab
2011-06-19 10:17 ` Geert Uytterhoeven
2011-06-19 11:19 ` Andreas Schwab
2011-06-19 13:36 ` Geert Uytterhoeven
2011-06-19 13:58 ` Andreas Schwab
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