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authorCédric Le Goater <clg@kaod.org>2017-08-30 21:46:13 +0200
committerMichael Ellerman <mpe@ellerman.id.au>2017-09-02 13:02:36 +0200
commit99f122573e76376088019d7c3a44744e62db9415 (patch)
treec1ee7789bf7c54a4f95b736adcd7ada62222d9ac /arch
parentpowerpc/xive: rename xive_poke_esb() in xive_esb_read() (diff)
downloadlinux-99f122573e76376088019d7c3a44744e62db9415.tar.xz
linux-99f122573e76376088019d7c3a44744e62db9415.zip
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/sysdev/xive/common.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/powerpc/sysdev/xive/common.c b/arch/powerpc/sysdev/xive/common.c
index 975bdbd5fa51..9ac9626c0fa6 100644
--- a/arch/powerpc/sysdev/xive/common.c
+++ b/arch/powerpc/sysdev/xive/common.c
@@ -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