Similar to x86/s390 add a debugfs file to tune tlb_single_page_flush_ceiling.
Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.ibm.com>
---
arch/powerpc/mm/book3s64/radix_tlb.c | 48 ++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/arch/powerpc/mm/book3s64/radix_tlb.c
b/arch/powerpc/mm/book3s64/radix_tlb.c
index aefc100d79a7..5cca0fe130e7 100644
--- a/arch/powerpc/mm/book3s64/radix_tlb.c
+++ b/arch/powerpc/mm/book3s64/radix_tlb.c
@@ -17,6 +17,7 @@
#include <asm/trace.h>
#include <asm/cputhreads.h>
#include <asm/plpar_wrappers.h>
+#include <asm/debugfs.h>
#include "internal.h"
@@ -1524,3 +1525,50 @@ void do_h_rpt_invalidate_prt(unsigned long pid, unsigned
long lpid,
EXPORT_SYMBOL_GPL(do_h_rpt_invalidate_prt);
#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
+
+static ssize_t tlbflush_read_file(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ char buf[32];
+ unsigned int len;
+
+ len = sprintf(buf, "%ld\n", tlb_single_page_flush_ceiling);
+ return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static ssize_t tlbflush_write_file(struct file *file,
+ const char __user *user_buf, size_t count, loff_t *ppos)
+{
+ char buf[32];
+ ssize_t len;
+ int ceiling;
+
+ len = min(count, sizeof(buf) - 1);
+ if (copy_from_user(buf, user_buf, len))
+ return -EFAULT;
+
+ buf[len] = '\0';
+ if (kstrtoint(buf, 0, &ceiling))
+ return -EINVAL;
+
+ if (ceiling < 0)
+ return -EINVAL;
+
+ tlb_single_page_flush_ceiling = ceiling;
+ return count;
+}
+
+static const struct file_operations fops_tlbflush = {
+ .read = tlbflush_read_file,
+ .write = tlbflush_write_file,
+ .llseek = default_llseek,
+};
+
+static int __init create_tlb_single_page_flush_ceiling(void)
+{
+ debugfs_create_file("tlb_single_page_flush_ceiling", S_IRUSR | S_IWUSR,
+ powerpc_debugfs_root, NULL, &fops_tlbflush);
+ return 0;
+}
+late_initcall(create_tlb_single_page_flush_ceiling);
+
--
2.31.1
