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powerpc/xive: introduce xive_esb_write() 

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>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Cédric Le Goater 2017-08-30 21:46:13 +02:00 committed by Michael Ellerman
parent 59fc2724e4
commit 99f122573e
1 changed files with 10 additions and 1 deletions
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11
arch/powerpc/sysdev/xive/common.c
View File

@ -203,6 +203,15 @@ static notrace 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 notrace 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