The mmiowb() macro is horribly difficult to use and drivers will continue
to work most of the time if they omit a call when it is required.
Rather than rely on driver authors getting this right, push mmiowb() into
arch_spin_unlock() for ia64. If this is deemed to be a performance issue,
a subsequent optimisation could make use of ARCH_HAS_MMIOWB to elide
the barrier in cases where no I/O writes were performned inside the
critical section.
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
---
arch/ia64/include/asm/Kbuild | 1 -
arch/ia64/include/asm/io.h | 4 ----
arch/ia64/include/asm/mmiowb.h | 12 ++++++++++++
arch/ia64/include/asm/spinlock.h | 2 ++
4 files changed, 14 insertions(+), 5 deletions(-)
create mode 100644 arch/ia64/include/asm/mmiowb.h
diff --git a/arch/ia64/include/asm/Kbuild b/arch/ia64/include/asm/Kbuild
index 3273d7aedfa0..43e21fe3499c 100644
--- a/arch/ia64/include/asm/Kbuild
+++ b/arch/ia64/include/asm/Kbuild
@@ -4,7 +4,6 @@ generic-y += exec.h
generic-y += irq_work.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
-generic-y += mmiowb.h
generic-y += preempt.h
generic-y += trace_clock.h
generic-y += vtime.h
diff --git a/arch/ia64/include/asm/io.h b/arch/ia64/include/asm/io.h
index 1e6fef69bb01..7f2371ba04a4 100644
--- a/arch/ia64/include/asm/io.h
+++ b/arch/ia64/include/asm/io.h
@@ -119,8 +119,6 @@ extern int valid_mmap_phys_addr_range (unsigned long pfn, size_t count);
* Ensure ordering of I/O space writes. This will make sure that writes
* following the barrier will arrive after all previous writes. For most
* ia64 platforms, this is a simple 'mf.a' instruction.
- *
- * See Documentation/driver-api/device-io.rst for more information.
*/
static inline void ___ia64_mmiowb(void)
{
@@ -296,7 +294,6 @@ __outsl (unsigned long port, const void *src, unsigned long count)
#define __outb platform_outb
#define __outw platform_outw
#define __outl platform_outl
-#define __mmiowb platform_mmiowb
#define inb(p) __inb(p)
#define inw(p) __inw(p)
@@ -310,7 +307,6 @@ __outsl (unsigned long port, const void *src, unsigned long count)
#define outsb(p,s,c) __outsb(p,s,c)
#define outsw(p,s,c) __outsw(p,s,c)
#define outsl(p,s,c) __outsl(p,s,c)
-#define mmiowb() __mmiowb()
/*
* The address passed to these functions are ioremap()ped already.
diff --git a/arch/ia64/include/asm/mmiowb.h b/arch/ia64/include/asm/mmiowb.h
new file mode 100644
index 000000000000..238d56172c6f
--- /dev/null
+++ b/arch/ia64/include/asm/mmiowb.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _ASM_IA64_MMIOWB_H
+#define _ASM_IA64_MMIOWB_H
+
+#include <asm/machvec.h>
+
+#define mmiowb() platform_mmiowb()
+
+#include <asm-generic/mmiowb.h>
+
+#endif /* _ASM_IA64_MMIOWB_H */
diff --git a/arch/ia64/include/asm/spinlock.h b/arch/ia64/include/asm/spinlock.h
index afd0b3121b4c..5f620e66384e 100644
--- a/arch/ia64/include/asm/spinlock.h
+++ b/arch/ia64/include/asm/spinlock.h
@@ -73,6 +73,8 @@ static __always_inline void __ticket_spin_unlock(arch_spinlock_t *lock)
{
unsigned short *p = (unsigned short *)&lock->lock + 1, tmp;
+ /* This could be optimised with ARCH_HAS_MMIOWB */
+ mmiowb();
asm volatile ("ld2.bias %0=[%1]" : "=r"(tmp) : "r"(p));
WRITE_ONCE(*p, (tmp + 2) & ~1);
}
--
2.11.0
