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| author | Cédric Le Goater <clg@kaod.org> | 2017-08-30 21:46:13 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-09-02 21:02:36 +1000 |
| commit | 99f122573e76376088019d7c3a44744e62db9415 (patch) | |
| tree | c1ee7789bf7c54a4f95b736adcd7ada62222d9ac /arch | |
| parent | 59fc2724e45dfea849336108c602e93ea880a18f (diff) | |
| download | linux-99f122573e76376088019d7c3a44744e62db9415.tar.gz linux-99f122573e76376088019d7c3a44744e62db9415.tar.bz2 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.c | 11 |
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 |