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 <c...@kaod.org>
> Reviewed-by: David Gibson <da...@gibson.dropbear.id.au>
Acked-by: Benjamin Herrenschmidt <b...@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
