ANDROID: dm verity: add minimum prefetch size

[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / drivers / md / Kconfig

diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 6035794bc1f208809aa0175685a3a15f58fc2c7d..3d237a03dab3dbd2ead85526a76e8ddcf9271f2d 100644 (file)
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -458,6 +458,21 @@ config DM_VERITY
 
          If unsure, say N.
 
+config DM_VERITY_HASH_PREFETCH_MIN_SIZE_128
+       bool "Prefetch size 128"
+
+config DM_VERITY_HASH_PREFETCH_MIN_SIZE
+       int "Verity hash prefetch minimum size"
+       depends on DM_VERITY
+       range 1 4096
+       default 128 if DM_VERITY_HASH_PREFETCH_MIN_SIZE_128
+       default 1
+       ---help---
+         This sets minimum number of hash blocks to prefetch for dm-verity.
+         For devices like eMMC, having larger prefetch size like 128 can improve
+         performance with increased memory consumption for keeping more hashes
+         in RAM.
+
 config DM_VERITY_FEC
        bool "Verity forward error correction support"
        depends on DM_VERITY
@@ -510,6 +525,7 @@ config DM_ANDROID_VERITY
        depends on ASYMMETRIC_KEY_TYPE
        depends on ASYMMETRIC_PUBLIC_KEY_SUBTYPE
        depends on MD_LINEAR
+       select DM_VERITY_HASH_PREFETCH_MIN_SIZE_128
        ---help---
          This device-mapper target is virtually a VERITY target. This
          target is setup by reading the metadata contents piggybacked