x86/tlb: add tlb_flushall_shift knob into debugfs

kernel will replace cr3 rewrite with invlpg when
  tlb_flush_entries <= active_tlb_entries / 2^tlb_flushall_factor
if tlb_flushall_factor is -1, kernel won't do this replacement.

User can modify its value according to specific CPU/applications.

Thanks for Borislav providing the help message of
CONFIG_DEBUG_TLBFLUSH.

Signed-off-by: Alex Shi <alex.shi@intel.com>
Link: http://lkml.kernel.org/r/1340845344-27557-6-git-send-email-alex.shi@intel.com
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

2 files changed, 70 insertions, 0 deletions

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index e46c2147397f..b322f124ee3c 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -129,6 +129,25 @@ config DOUBLEFAULT
           option saves about 4k and might cause you much additional grey
           hair.
 
+config DEBUG_TLBFLUSH
+        bool "Set upper limit of TLB entries to flush one-by-one"
+        depends on DEBUG_KERNEL && (X86_64 || X86_INVLPG)
+        ---help---
+
+        X86-only for now.
+
+        This option allows the user to tune the amount of TLB entries the
+        kernel flushes one-by-one instead of doing a full TLB flush. In
+        certain situations, the former is cheaper. This is controlled by the
+        tlb_flushall_shift knob under /sys/kernel/debug/x86. If you set it
+        to -1, the code flushes the whole TLB unconditionally. Otherwise,
+        for positive values of it, the kernel will use single TLB entry
+        invalidating instructions according to the following formula:
+
+        flush_entries <= active_tlb_entries / 2^tlb_flushall_shift
+
+        If in doubt, say "N".
+
 config IOMMU_DEBUG
         bool "Enable IOMMU debugging"
         depends on GART_IOMMU && DEBUG_KERNEL
diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 2939f2f9edbb..5911f61e300e 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -12,6 +12,7 @@
 #include <asm/cache.h>
 #include <asm/apic.h>
 #include <asm/uv/uv.h>
+#include <linux/debugfs.h>
 
 DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate)
                         = { &init_mm, 0, };
@@ -430,3 +431,53 @@ void flush_tlb_all(void)
 {
         on_each_cpu(do_flush_tlb_all, NULL, 1);
 }
+
+#ifdef CONFIG_DEBUG_TLBFLUSH
+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, "%hd\n", tlb_flushall_shift);
+        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;
+        s8 shift;
+
+        len = min(count, sizeof(buf) - 1);
+        if (copy_from_user(buf, user_buf, len))
+                return -EFAULT;
+
+        buf[len] = '\0';
+        if (kstrtos8(buf, 0, &shift))
+                return -EINVAL;
+
+        if (shift > 64)
+                return -EINVAL;
+
+        tlb_flushall_shift = shift;
+        return count;
+}
+
+static const struct file_operations fops_tlbflush = {
+        .read = tlbflush_read_file,
+        .write = tlbflush_write_file,
+        .llseek = default_llseek,
+};
+
+static int __cpuinit create_tlb_flushall_shift(void)
+{
+        if (cpu_has_invlpg) {
+                debugfs_create_file("tlb_flushall_shift", S_IRUSR | S_IWUSR,
+                        arch_debugfs_dir, NULL, &fops_tlbflush);
+        }
+        return 0;
+}
+late_initcall(create_tlb_flushall_shift);
+#endif