From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "Cédric Le Goater" <clg@kaod.org>, linuxppc-dev@lists.ozlabs.org
Cc: Michael Ellerman <mpe@ellerman.id.au>,
Paul Mackerras <paulus@samba.org>,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [PATCH v3 4/8] powerpc/xive: introduce xive_esb_write()
Date: Fri, 01 Sep 2017 15:31:20 +1000 [thread overview]
Message-ID: <1504243880.4974.71.camel@kernel.crashing.org> (raw)
In-Reply-To: <20170830194617.26621-5-clg@kaod.org>
On Wed, 2017-08-30 at 21:46 +0200, Cédric Le Goater wrote:
> Some source support MMIO stores on the ESB page to perform EOI. Let's
> introduce a specific routine for this case even if this should be the
> only use of it.
>
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> ---
> arch/powerpc/sysdev/xive/common.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/sysdev/xive/common.c b/arch/powerpc/sysdev/xive/common.c
> index 8a58662ed793..ac5f18a66742 100644
> --- a/arch/powerpc/sysdev/xive/common.c
> +++ b/arch/powerpc/sysdev/xive/common.c
> @@ -203,6 +203,15 @@ static u8 xive_esb_read(struct xive_irq_data *xd, u32 offset)
> return (u8)val;
> }
>
> +static void xive_esb_write(struct xive_irq_data *xd, u32 offset, u64 data)
> +{
> + /* Handle HW errata */
> + if (xd->flags & XIVE_IRQ_FLAG_SHIFT_BUG)
> + offset |= offset << 4;
> +
> + out_be64(xd->eoi_mmio + offset, data);
> +}
> +
> #ifdef CONFIG_XMON
> static void xive_dump_eq(const char *name, struct xive_q *q)
> {
> @@ -297,7 +306,7 @@ void xive_do_source_eoi(u32 hw_irq, struct xive_irq_data *xd)
> {
> /* If the XIVE supports the new "store EOI facility, use it */
> if (xd->flags & XIVE_IRQ_FLAG_STORE_EOI)
> - out_be64(xd->eoi_mmio + XIVE_ESB_STORE_EOI, 0);
> + xive_esb_write(xd, XIVE_ESB_STORE_EOI, 0);
> else if (hw_irq && xd->flags & XIVE_IRQ_FLAG_EOI_FW) {
> /*
> * The FW told us to call it. This happens for some
next prev parent reply other threads:[~2017-09-01 5:31 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-30 19:46 [PATCH v3 0/8] guest exploitation of the XIVE interrupt controller Cédric Le Goater
2017-08-30 19:46 ` [PATCH v3 1/8] powerpc/xive: introduce a common routine xive_queue_page_alloc() Cédric Le Goater
2017-09-01 5:26 ` Benjamin Herrenschmidt
2017-09-06 10:55 ` [v3, " Michael Ellerman
2017-08-30 19:46 ` [PATCH v3 2/8] powerpc/xive: guest exploitation of the XIVE interrupt controller Cédric Le Goater
2017-09-01 5:29 ` Benjamin Herrenschmidt
2017-08-30 19:46 ` [PATCH v3 3/8] powerpc/xive: rename xive_poke_esb() in xive_esb_read() Cédric Le Goater
2017-09-01 5:30 ` Benjamin Herrenschmidt
2017-08-30 19:46 ` [PATCH v3 4/8] powerpc/xive: introduce xive_esb_write() Cédric Le Goater
2017-09-01 5:31 ` Benjamin Herrenschmidt [this message]
2017-08-30 19:46 ` [PATCH v3 5/8] powerpc/xive: add the HW IRQ number under xive_irq_data Cédric Le Goater
2017-09-01 5:34 ` Benjamin Herrenschmidt
2017-08-30 19:46 ` [PATCH v3 6/8] powerpc/xive: introduce H_INT_ESB hcall Cédric Le Goater
2017-09-01 6:01 ` Benjamin Herrenschmidt
2017-08-30 19:46 ` [PATCH v3 7/8] powerpc/xive: add XIVE Exploitation Mode to CAS Cédric Le Goater
2017-08-30 19:46 ` [PATCH v3 8/8] powerpc/xive: improve debugging macros Cédric Le Goater
2017-09-01 5:43 ` Benjamin Herrenschmidt
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