Fix D-cache aliasing problem in the PIO IDE driver potencially resulting
in the kernel or userspace seeing stale data.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/include/asm-mips/mach-generic/ide.h b/include/asm-mips/mach-generic/ide.h
index cb2edd0..9610069 100644
--- a/include/asm-mips/mach-generic/ide.h
+++ b/include/asm-mips/mach-generic/ide.h
@@ -18,6 +18,7 @@
#include <linux/config.h>
#include <linux/pci.h>
#include <linux/stddef.h>
+#include <asm/processor.h>
#ifndef MAX_HWIFS
# ifdef CONFIG_BLK_DEV_IDEPCI
@@ -104,15 +105,71 @@
/* MIPS port and memory-mapped I/O string operations. */
-#define __ide_insw insw
-#define __ide_insl insl
-#define __ide_outsw outsw
-#define __ide_outsl outsl
+static inline void __ide_flush_dcache_range(unsigned long addr, unsigned long size)
+{
+ if (cpu_has_dc_aliases) {
+ unsigned long end = addr + size;
+ for (; addr < end; addr += PAGE_SIZE)
+ flush_dcache_page(virt_to_page(addr));
+ }
+}
-#define __ide_mm_insw readsw
-#define __ide_mm_insl readsl
-#define __ide_mm_outsw writesw
-#define __ide_mm_outsl writesl
+static inline void __ide_insw(unsigned long port, void *addr,
+ unsigned int count)
+{
+ insw(port, addr, count);
+ __ide_flush_dcache_range((unsigned long)addr, count * 2);
+}
+
+static inline void __ide_insl(unsigned long port, void *addr, unsigned int count)
+{
+ insl(port, addr, count);
+ __ide_flush_dcache_range((unsigned long)addr, count * 4);
+}
+
+static inline void __ide_outsw(unsigned long port, const void *addr,
+ unsigned long count)
+{
+ outsw(port, addr, count);
+ __ide_flush_dcache_range((unsigned long)addr, count * 2);
+}
+
+static inline void __ide_outsl(unsigned long port, const void *addr,
+ unsigned long count)
+{
+ outsl(port, addr, count);
+ __ide_flush_dcache_range((unsigned long)addr, count * 4);
+}
+
+static inline void __ide_mm_insw(void __iomem *port, void *addr, u32 count)
+{
+ readsw(port, addr, count);
+ __ide_flush_dcache_range((unsigned long)addr, count * 2);
+}
+
+static inline void __ide_mm_insl(void __iomem *port, void *addr, u32 count)
+{
+ readsl(port, addr, count);
+ __ide_flush_dcache_range((unsigned long)addr, count * 4);
+}
+
+static inline void __ide_mm_outsw(void __iomem *port, void *addr, u32 count)
+{
+ writesw(port, addr, count);
+ __ide_flush_dcache_range((unsigned long)addr, count * 2);
+}
+
+static inline void __ide_mm_outsl(void __iomem * port, void *addr, u32 count)
+{
+ writesl(port, addr, count);
+ __ide_flush_dcache_range((unsigned long)addr, count * 4);
+}
+
+/* ide_insw calls insw, not __ide_insw. Why? */
+#undef insw
+#undef insl
+#define insw(port, addr, count) __ide_insw(port, addr, count)
+#define insl(port, addr, count) __ide_insl(port, addr, count)
#endif /* __KERNEL__ */