Re: [PATCH v2 6/6] scsi: ufs: exynos: Add support for Flash Memory Protector (FMP)

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On 7/2/24 12:25 AM, Eric Biggers wrote:
From: Eric Biggers <ebiggers@xxxxxxxxxx>

Add support for Flash Memory Protector (FMP), which is the inline
encryption hardware on Exynos and Exynos-based SoCs.

Specifically, add support for the "traditional FMP mode" that works on
many Exynos-based SoCs including gs101.  This is the mode that uses
"software keys" and is compatible with the upstream kernel's existing
inline encryption framework in the block and filesystem layers.  I plan
to add support for the wrapped key support on gs101 at a later time.

Tested on gs101 (specifically Pixel 6) by running the 'encrypt' group of
xfstests on a filesystem mounted with the 'inlinecrypt' mount option.

Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
  drivers/ufs/host/ufs-exynos.c | 228 +++++++++++++++++++++++++++++++++-
  1 file changed, 222 insertions(+), 6 deletions(-)

diff --git a/drivers/ufs/host/ufs-exynos.c b/drivers/ufs/host/ufs-exynos.c
index 88d125d1ee3c..dd545ef7c361 100644
--- a/drivers/ufs/host/ufs-exynos.c
+++ b/drivers/ufs/host/ufs-exynos.c
@@ -6,10 +6,13 @@
   * Author: Seungwon Jeon  <essuuj@xxxxxxxxx>
   * Author: Alim Akhtar <alim.akhtar@xxxxxxxxxxx>
   *
   */
+#include <asm/unaligned.h>
+#include <crypto/aes.h>
+#include <linux/arm-smccc.h>
  #include <linux/clk.h>
  #include <linux/delay.h>
  #include <linux/module.h>
  #include <linux/of.h>
  #include <linux/of_address.h>
@@ -23,16 +26,18 @@
  #include <ufs/ufshci.h>
  #include <ufs/unipro.h>
#include "ufs-exynos.h" +#define DATA_UNIT_SIZE 4096
+#define LOG2_DATA_UNIT_SIZE	12

If this series has to be reposted, please consider changing "12" into
"ilog2(DATA_UNIT_SIZE)". I think that the ilog2() macro generates a
constant expression if its argument is a constant.

In case it wouldn't be clear, I'm fine with this patch with or without
that change.

Thanks,

Bart.





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