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-rw-r--r--arch/powerpc/lib/pmem.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/arch/powerpc/lib/pmem.c b/arch/powerpc/lib/pmem.c
new file mode 100644
index 000000000..1550e0d25
--- /dev/null
+++ b/arch/powerpc/lib/pmem.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright(c) 2017 IBM Corporation. All rights reserved.
+ */
+
+#include <linux/string.h>
+#include <linux/export.h>
+#include <linux/uaccess.h>
+
+#include <asm/cacheflush.h>
+
+static inline void __clean_pmem_range(unsigned long start, unsigned long stop)
+{
+ unsigned long shift = l1_dcache_shift();
+ unsigned long bytes = l1_dcache_bytes();
+ void *addr = (void *)(start & ~(bytes - 1));
+ unsigned long size = stop - (unsigned long)addr + (bytes - 1);
+ unsigned long i;
+
+ for (i = 0; i < size >> shift; i++, addr += bytes)
+ asm volatile(PPC_DCBSTPS(%0, %1): :"i"(0), "r"(addr): "memory");
+}
+
+static inline void __flush_pmem_range(unsigned long start, unsigned long stop)
+{
+ unsigned long shift = l1_dcache_shift();
+ unsigned long bytes = l1_dcache_bytes();
+ void *addr = (void *)(start & ~(bytes - 1));
+ unsigned long size = stop - (unsigned long)addr + (bytes - 1);
+ unsigned long i;
+
+ for (i = 0; i < size >> shift; i++, addr += bytes)
+ asm volatile(PPC_DCBFPS(%0, %1): :"i"(0), "r"(addr): "memory");
+}
+
+static inline void clean_pmem_range(unsigned long start, unsigned long stop)
+{
+ if (cpu_has_feature(CPU_FTR_ARCH_207S))
+ return __clean_pmem_range(start, stop);
+}
+
+static inline void flush_pmem_range(unsigned long start, unsigned long stop)
+{
+ if (cpu_has_feature(CPU_FTR_ARCH_207S))
+ return __flush_pmem_range(start, stop);
+}
+
+/*
+ * CONFIG_ARCH_HAS_PMEM_API symbols
+ */
+void arch_wb_cache_pmem(void *addr, size_t size)
+{
+ unsigned long start = (unsigned long) addr;
+ clean_pmem_range(start, start + size);
+}
+EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);
+
+void arch_invalidate_pmem(void *addr, size_t size)
+{
+ unsigned long start = (unsigned long) addr;
+ flush_pmem_range(start, start + size);
+}
+EXPORT_SYMBOL_GPL(arch_invalidate_pmem);
+
+/*
+ * CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE symbols
+ */
+long __copy_from_user_flushcache(void *dest, const void __user *src,
+ unsigned size)
+{
+ unsigned long copied, start = (unsigned long) dest;
+
+ copied = __copy_from_user(dest, src, size);
+ clean_pmem_range(start, start + size);
+
+ return copied;
+}
+
+void memcpy_flushcache(void *dest, const void *src, size_t size)
+{
+ unsigned long start = (unsigned long) dest;
+
+ memcpy(dest, src, size);
+ clean_pmem_range(start, start + size);
+}
+EXPORT_SYMBOL(memcpy_flushcache);
+
+void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
+ size_t len)
+{
+ memcpy_flushcache(to, page_to_virt(page) + offset, len);
+}
+EXPORT_SYMBOL(memcpy_page_flushcache);