Re: [PATCH v2] crypto: s5p-sss: Add HASH support for Exynos

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On Fri, Sep 15, 2017 at 07:50:06PM +0200, Kamil Konieczny wrote:
> Add support for MD5, SHA1, SHA256 hash algorithms for Exynos HW.
> It uses the crypto framework asynchronous hash api.
> It is based on omap-sham.c driver.
> S5P has some HW differencies and is not implemented.
> 
> Modifications in s5p-sss:
> 
> - Add hash supporting structures and functions.
> 
> - Modify irq handler to handle both aes and hash signals.
> 
> - Resize resource end in probe if EXYNOS_HASH is enabled in
>   Kconfig.
> 
> - Add new copyright line and new author.
> 
> - Tested on Odroid-U3 with Exynos 4412 CPU, kernel 4.13-rc6
>   with crypto run-time self test testmgr
>   and with tcrypt module with: modprobe tcrypt sec=1 mode=N
>   where N=402, 403, 404 (MD5, SHA1, SHA256).
> 
> Modifications in drivers/crypto/Kconfig:
> 
> - Add new CRYPTO_DEV_EXYNOS_HASH, depend on !EXYNOS_RNG
>   and CRYPTO_DEV_S5P
> 
> - Select sw algorithms MD5, SHA1 and SHA256 in EXYNOS_HASH
>   as they are nedded for fallback.
> 
> Signed-off-by: Kamil Konieczny <k.konieczny@xxxxxxxxxxxxxxxxxxx>
> ---
> version 2:
> - change patch format so number of lines drops
> - change in Kconfig as suggested by Krzysztof Kozlowski, add
> 	EXYNOS_HASH subsection
> - change #ifndef EXYNOS_RNG into #ifdef CRYPTO_DEV_EXYNOS_HASH
> - remove style fixups in aes, as they should go in separate patch
> - remove FLOW_LOG, FLOW_DUMP macros and its uses
> - remove #if 0 ... endif
> - remove unused function hash_wait and its defines
> - fix compiler warning in dev_dbg
> - remove some comments
> - other minor fixes in comments

Thanks for the changes. I must admit that I did not finish the review...
I found a lot of minor stuff but actually I did not look at overall
concept, architecture and how it really works. Sorry, will do it
later... :)

>  drivers/crypto/Kconfig   |   12 +
>  drivers/crypto/s5p-sss.c | 1683 +++++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 1674 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
> index fe33c199fc1a..2f094c433346 100644
> --- a/drivers/crypto/Kconfig
> +++ b/drivers/crypto/Kconfig
> @@ -439,6 +439,18 @@ config CRYPTO_DEV_S5P
>  	  Select this to offload Samsung S5PV210 or S5PC110, Exynos from AES
>  	  algorithms execution.
>  
> +config CRYPTO_DEV_EXYNOS_HASH
> +	bool "Support for Samsung Exynos HASH accelerator"
> +	depends on CRYPTO_DEV_S5P
> +	depends on !CRYPTO_DEV_EXYNOS_RNG && CRYPTO_DEV_EXYNOS_RNG!=m
> +	select CRYPTO_SHA1
> +	select CRYPTO_MD5
> +	select CRYPTO_SHA256
> +	help
> +	  Select this to offload Exynos from HASH MD5/SHA1/SHA256.
> +	  HASH algorithms will be disabled if EXYNOS_RNG
> +	  is enabled due to hw conflict.
> +
>  config CRYPTO_DEV_NX
>  	bool "Support for IBM PowerPC Nest (NX) cryptographic acceleration"
>  	depends on PPC64
> diff --git a/drivers/crypto/s5p-sss.c b/drivers/crypto/s5p-sss.c
> index 7ac657f46d15..e951f0ffe49b 100644
> --- a/drivers/crypto/s5p-sss.c
> +++ b/drivers/crypto/s5p-sss.c
> @@ -1,18 +1,21 @@
>  /*
>   * Cryptographic API.
>   *
> - * Support for Samsung S5PV210 HW acceleration.
> + * Support for Samsung S5PV210 and Exynos HW acceleration.
>   *
>   * Copyright (C) 2011 NetUP Inc. All rights reserved.
> + * Copyright (c) 2017 Samsung Electronics Co., Ltd. All rights reserved.
>   *
>   * This program is free software; you can redistribute it and/or modify
>   * it under the terms of the GNU General Public License version 2 as published
>   * by the Free Software Foundation.
>   *
> + * Hash part based on omap-sham.c driver.
>   */
>  
>  #include <linux/clk.h>
>  #include <linux/crypto.h>
> +#include <linux/delay.h>
>  #include <linux/dma-mapping.h>
>  #include <linux/err.h>
>  #include <linux/errno.h>
> @@ -30,28 +33,41 @@
>  #include <crypto/algapi.h>
>  #include <crypto/scatterwalk.h>
>  
> +#include <crypto/hash.h>
> +#include <crypto/md5.h>
> +#include <crypto/sha.h>
> +#include <crypto/internal/hash.h>
> +
>  #define _SBF(s, v)                      ((v) << (s))
>  
>  /* Feed control registers */
>  #define SSS_REG_FCINTSTAT               0x0000
> +#define SSS_FCINTSTAT_HPARTINT		BIT(7)
> +#define SSS_FCINTSTAT_HDONEINT		BIT(5)

Your indentation is correct but existing uses spaces. Could you send a
follow up fixing existing indents to be consistent?

>  #define SSS_FCINTSTAT_BRDMAINT          BIT(3)
>  #define SSS_FCINTSTAT_BTDMAINT          BIT(2)
>  #define SSS_FCINTSTAT_HRDMAINT          BIT(1)
>  #define SSS_FCINTSTAT_PKDMAINT          BIT(0)
>  
>  #define SSS_REG_FCINTENSET              0x0004
> +#define SSS_FCINTENSET_HPARTINTENSET	BIT(7)
> +#define SSS_FCINTENSET_HDONEINTENSET	BIT(5)
>  #define SSS_FCINTENSET_BRDMAINTENSET    BIT(3)
>  #define SSS_FCINTENSET_BTDMAINTENSET    BIT(2)
>  #define SSS_FCINTENSET_HRDMAINTENSET    BIT(1)
>  #define SSS_FCINTENSET_PKDMAINTENSET    BIT(0)
>  
>  #define SSS_REG_FCINTENCLR              0x0008
> +#define SSS_FCINTENCLR_HPARTINTENCLR	BIT(7)
> +#define SSS_FCINTENCLR_HDONEINTENCLR	BIT(5)
>  #define SSS_FCINTENCLR_BRDMAINTENCLR    BIT(3)
>  #define SSS_FCINTENCLR_BTDMAINTENCLR    BIT(2)
>  #define SSS_FCINTENCLR_HRDMAINTENCLR    BIT(1)
>  #define SSS_FCINTENCLR_PKDMAINTENCLR    BIT(0)
>  
>  #define SSS_REG_FCINTPEND               0x000C
> +#define SSS_FCINTPEND_HPARTINTP		BIT(7)
> +#define SSS_FCINTPEND_HDONEINTP		BIT(5)
>  #define SSS_FCINTPEND_BRDMAINTP         BIT(3)
>  #define SSS_FCINTPEND_BTDMAINTP         BIT(2)
>  #define SSS_FCINTPEND_HRDMAINTP         BIT(1)
> @@ -72,6 +88,7 @@
>  #define SSS_HASHIN_INDEPENDENT          _SBF(0, 0x00)
>  #define SSS_HASHIN_CIPHER_INPUT         _SBF(0, 0x01)
>  #define SSS_HASHIN_CIPHER_OUTPUT        _SBF(0, 0x02)
> +#define SSS_HASHIN_MASK			_SBF(0, 0x03)
>  
>  #define SSS_REG_FCBRDMAS                0x0020
>  #define SSS_REG_FCBRDMAL                0x0024
> @@ -146,9 +163,115 @@
>  #define AES_KEY_LEN         16
>  #define CRYPTO_QUEUE_LEN    1
>  
> +/* HASH registers */
> +#define SSS_REG_HASH_CTRL		0x00
> +
> +#define SSS_HASH_USER_IV_EN		BIT(5)
> +#define SSS_HASH_INIT_BIT		BIT(4)
> +#define SSS_HASH_ENGINE_SHA1		_SBF(1, 0x00)
> +#define SSS_HASH_ENGINE_MD5		_SBF(1, 0x01)
> +#define SSS_HASH_ENGINE_SHA256		_SBF(1, 0x02)
> +
> +#define SSS_HASH_ENGINE_MASK		_SBF(1, 0x03)
> +
> +#define SSS_REG_HASH_CTRL_PAUSE		0x04
> +
> +#define SSS_HASH_PAUSE			BIT(0)
> +
> +#define SSS_REG_HASH_CTRL_FIFO		0x08
> +
> +#define SSS_HASH_FIFO_MODE_DMA		BIT(0)
> +#define SSS_HASH_FIFO_MODE_CPU          0
> +
> +#define SSS_REG_HASH_CTRL_SWAP		0x0c

Upper case hex appears in other places so switch to 0x0C for
consistency.

> +
> +#define SSS_HASH_BYTESWAP_DI		BIT(3)
> +#define SSS_HASH_BYTESWAP_DO		BIT(2)
> +#define SSS_HASH_BYTESWAP_IV		BIT(1)
> +#define SSS_HASH_BYTESWAP_KEY		BIT(0)
> +
> +#define SSS_REG_HASH_STATUS		0x10
> +
> +#define SSS_HASH_STATUS_MSG_DONE	BIT(6)
> +#define SSS_HASH_STATUS_PARTIAL_DONE	BIT(4)
> +#define SSS_HASH_STATUS_BUFFER_READY	BIT(0)
> +
> +#define SSS_REG_HASH_MSG_SIZE_LOW	0x20
> +#define SSS_REG_HASH_MSG_SIZE_HIGH	0x24
> +
> +#define SSS_REG_HASH_PRE_MSG_SIZE_LOW	0x28
> +#define SSS_REG_HASH_PRE_MSG_SIZE_HIGH	0x2c
> +
> +#define SSS_REG_TYPE			u32

This define looks useless.

> +#define HASH_MAX_REG			16

Hmmmm, 16, not 8? I thought we have maximum 8 registers for result and
IV?

> +#define HASH_REG_SIZEOF			sizeof(SSS_REG_TYPE)
> +
> +#define HASH_BLOCK_SIZE			(HASH_MAX_REG*HASH_REG_SIZEOF)
> +
> +#define HASH_MD5_MAX_REG		(MD5_DIGEST_SIZE / HASH_REG_SIZEOF)
> +#define HASH_SHA1_MAX_REG		(SHA1_DIGEST_SIZE / HASH_REG_SIZEOF)
> +#define HASH_SHA256_MAX_REG		(SHA256_DIGEST_SIZE / HASH_REG_SIZEOF)
> +
> +#define SSS_REG_HASH_IV(s)		(0xB0 + ((s) << 2))
> +#define SSS_REG_HASH_OUT(s)		(0x100 + ((s) << 2))
> +
> +/* HASH flags */

All defines below have "HASH_FLAGS" prefix... so actually useful would
be to explain also what is a hash flag.

> +#define HASH_FLAGS_BUSY		0
> +#define HASH_FLAGS_FINAL	1
> +#define HASH_FLAGS_DMA_ACTIVE	2
> +#define HASH_FLAGS_OUTPUT_READY	3
> +#define HASH_FLAGS_INIT		4
> +#define HASH_FLAGS_DMA_READY	6
> +
> +#define HASH_FLAGS_SGS_COPIED	9
> +#define HASH_FLAGS_SGS_ALLOCED	10
> +/* HASH context flags */

Same here.

> +#define HASH_FLAGS_FINUP	16
> +#define HASH_FLAGS_ERROR	17
> +
> +#define HASH_FLAGS_MODE_MD5	18
> +#define HASH_FLAGS_MODE_SHA1	19
> +#define HASH_FLAGS_MODE_SHA256	20

These are set and not read?

> +
> +#define HASH_FLAGS_MODE_MASK	(BIT(18) | BIT(19) | BIT(20))

Not used.

> +/* HASH op codes */
> +#define HASH_OP_UPDATE		1
> +#define HASH_OP_FINAL		2
> +
> +/* HASH HW constants */
> +#define HASH_ALIGN_MASK		(HASH_BLOCK_SIZE-1)

Not used.

> +
> +#define BUFLEN			HASH_BLOCK_SIZE
> +
> +#define SSS_DMA_ALIGN		16
> +#define SSS_ALIGNED		__attribute__((aligned(SSS_DMA_ALIGN)))
> +#define SSS_DMA_ALIGN_MASK	(SSS_DMA_ALIGN-1)

Please make it consistent with existing code, e.g.: by replacing
AES .cra_alignmask with same macro. In separate patch of course.

> +
> +/* HASH queue constant */

Pretty useless comment. Do not use comments which copy the code. You
could explain here why you have chosen 10 (existing AES code uses 1).

> +#define SSS_HASH_QUEUE_LENGTH	10
> +
> +/**
> + * struct sss_hash_algs_info - platform specific SSS HASH algorithms
> + * @algs_list:	array of transformations (algorithms)
> + * @size:	size
> + * @registered:	counter used at probe/remove
> + *
> + * Specifies platform specific information about hash algorithms
> + * of SSS module.
> + */
> +struct sss_hash_algs_info {
> +	struct ahash_alg	*algs_list;
> +	unsigned int		size;
> +	unsigned int		registered;
> +};
> +
>  /**
>   * struct samsung_aes_variant - platform specific SSS driver data
>   * @aes_offset: AES register offset from SSS module's base.
> + * @hash_offset: HASH register offset from SSS module's base.
> + *
> + * @hash_algs_info: HASH transformations provided by SS module
> + * @hash_algs_size: size of hash_algs_info
>   *
>   * Specifies platform specific configuration of SSS module.
>   * Note: A structure for driver specific platform data is used for future
> @@ -156,6 +279,10 @@
>   */
>  struct samsung_aes_variant {
>  	unsigned int			aes_offset;
> +	unsigned int			hash_offset;
> +
> +	struct sss_hash_algs_info	*hash_algs_info;
> +	unsigned int			hash_algs_size;
>  };
>  
>  struct s5p_aes_reqctx {
> @@ -194,7 +321,21 @@ struct s5p_aes_ctx {
>   *		req, ctx, sg_src/dst (and copies).  This essentially
>   *		protects against concurrent access to these fields.
>   * @lock:	Lock for protecting both access to device hardware registers
> - *		and fields related to current request (including the busy field).
> + *		and fields related to current request (including the busy
> + *		field).
> + * @res:	Resources for hash.
> + * @io_hash_base: Per-variant offset for HASH block IO memory.
> + * @hash_lock:	Lock for protecting hash_req and other HASH variables.

I must admit that I do not see how it protects the hash_req. The
hash_req looks untouched (not read, not modified) during this lock
critical section. Can you share some more thoughts about it?

> + * @hash_err:	Error flags for current HASH op.
> + * @hash_tasklet: New HASH request scheduling job.
> + * @xmit_buf:	Buffer for current HASH request transfer into SSS block.
> + * @hash_flags:	Flags for current HASH op.

What is the purpose of them?

> + * @hash_queue:	Async hash queue.
> + * @hash_req:	Current request sending to SSS HASH block.
> + * @hash_sg_iter: Scatterlist transferred through DMA into SSS HASH block.
> + * @hash_sg_cnt: Counter for hash_sg_iter.
> + *
> + * @pdata:	Per-variant algorithms for HASH ops.
>   */
>  struct s5p_aes_dev {
>  	struct device			*dev;
> @@ -215,16 +356,85 @@ struct s5p_aes_dev {
>  	struct crypto_queue		queue;
>  	bool				busy;
>  	spinlock_t			lock;
> +
> +	struct resource			*res;
> +	void __iomem			*io_hash_base;
> +
> +	spinlock_t			hash_lock;
> +	int				hash_err;

I do not see any setter to hash_err, except '= 0'.

> +	struct tasklet_struct		hash_tasklet;
> +	u8				xmit_buf[BUFLEN] SSS_ALIGNED;
> +
> +	unsigned long			hash_flags;

This should be probably DECLARE_BITMAP.

> +	struct crypto_queue		hash_queue;
> +	struct ahash_request		*hash_req;
> +	struct scatterlist		*hash_sg_iter;
> +	int				hash_sg_cnt;
> +
> +	struct samsung_aes_variant	*pdata;

This should be const as pdata should not be modified.

>  };
>  
> -static struct s5p_aes_dev *s5p_dev;
> +/**
> + * struct s5p_hash_reqctx - HASH request context
> + * @dev:	Associated device
> + * @flags:	Bits for current HASH request
> + * @op:		Current request operation (OP_UPDATE or UP_FINAL)
> + * @digcnt:	Number of bytes processed by HW (without buffer[] ones)
> + * @digest:	Digest message or IV for partial result
> + * @bufcnt:	Number of bytes holded in buffer[]
> + * @buflen:	Max length of the input data buffer
> + * @nregs:	Number of HW registers for digest or IV read/write.

Skip the trailing dot for consistency.

> + * @engine:	Flags for setting HASH SSS block.
> + * @sg:		sg for DMA transfer.
> + * @sg_len:	Length of sg for DMA transfer.
> + * @sgl[]:	sg for joining buffer and req->src scatterlist.
> + * @skip:	Skip offset in req->src for current op.
> + * @total:	Total number of bytes for current request.
> + * @buffer[]:	For byte(s) from end of req->src in UPDATE op.
> + */
> +struct s5p_hash_reqctx {
> +	struct s5p_aes_dev	*dd;
> +	unsigned long		flags;
> +	int			op;
> +
> +	u64			digcnt;
> +	u8			digest[SHA256_DIGEST_SIZE] SSS_ALIGNED;
> +	u32			bufcnt;
> +	u32			buflen;
> +
> +	int			nregs; /* digest_size / sizeof(reg) */
> +	u32			engine;
> +
> +	struct scatterlist	*sg;
> +	int			sg_len;
> +	struct scatterlist	sgl[2];
> +	int			skip;	/* skip offset in req->src sg */
> +	unsigned int		total;	/* total request */
> +
> +	u8			buffer[0] SSS_ALIGNED;
> +};
> +
> +/**
> + * struct s5p_hash_ctx - HASH transformation context
> + * @dd:		Associated device
> + * @flags:	Bits for algorithm HASH.
> + * @fallback:	Software transformation for zero message or size < BUFLEN.
> + */
> +struct s5p_hash_ctx {
> +	struct s5p_aes_dev	*dd;
> +	unsigned long		flags;
> +	struct crypto_shash	*fallback;
> +};
>  
> -static const struct samsung_aes_variant s5p_aes_data = {
> +static struct samsung_aes_variant s5p_aes_data = {

Why do you need to drop the const? This should not be modified.

>  	.aes_offset	= 0x4000,
> +	.hash_offset	= 0x6000,
> +	.hash_algs_size	= 0,
>  };
>  
> -static const struct samsung_aes_variant exynos_aes_data = {
> -	.aes_offset	= 0x200,
> +static struct samsung_aes_variant exynos_aes_data = {
> +	.aes_offset		= 0x200,
> +	.hash_offset		= 0x400,
>  };
>  
>  static const struct of_device_id s5p_sss_dt_match[] = {
> @@ -254,6 +464,8 @@ static inline struct samsung_aes_variant *find_s5p_sss_version
>  			platform_get_device_id(pdev)->driver_data;
>  }
>  
> +static struct s5p_aes_dev *s5p_dev;
> +

Still some weird moves of untouched lines... this is weird.

>  static void s5p_set_dma_indata(struct s5p_aes_dev *dev, struct scatterlist *sg)
>  {
>  	SSS_WRITE(dev, FCBRDMAS, sg_dma_address(sg));
> @@ -436,19 +648,85 @@ static int s5p_aes_rx(struct s5p_aes_dev *dev/*, bool *set_dma*/)
>  	return ret;
>  }
>  
> +static inline u32 s5p_hash_read(struct s5p_aes_dev *dd, u32 offset)
> +{
> +	return __raw_readl(dd->io_hash_base + offset);
> +}
> +
> +static inline void s5p_hash_write(struct s5p_aes_dev *dd,
> +				  u32 offset, u32 value)
> +{
> +	__raw_writel(value, dd->io_hash_base + offset);
> +}
> +
> +static inline void s5p_hash_write_mask(struct s5p_aes_dev *dd, u32 address,
> +				       u32 value, u32 mask)
> +{
> +	u32 val;
> +
> +	val = s5p_hash_read(dd, address);
> +	val &= ~mask;
> +	val |= value;
> +	s5p_hash_write(dd, address, val);
> +}
> +
> +/**
> + * s5p_set_dma_hashdata - start DMA with sg
> + * @dev:	device
> + * @sg:		scatterlist ready to DMA transmit
> + *
> + * decrement sg counter
> + * write addr and len into HASH regs

Please apply some sentence formatting.

> + *
> + * DMA starts after writing length
> + */
> +static void s5p_set_dma_hashdata(struct s5p_aes_dev *dev,
> +				 struct scatterlist *sg)
> +{
> +	dev->hash_sg_cnt--;
> +	WARN_ON(dev->hash_sg_cnt < 0);
> +	WARN_ON(sg_dma_len(sg) <= 0);

It cannot be less than 0... Probably decent compiler or Smatch or Sparse
points this. The question is whether you really need these checks. When
could they happen?

> +	SSS_WRITE(dev, FCHRDMAS, sg_dma_address(sg));
> +	SSS_WRITE(dev, FCHRDMAL, sg_dma_len(sg)); /* DMA starts */
> +}
> +
> +/**
> + * s5p_hash_rx - get next hash_sg_iter
> + * @dev:	device
> + *
> + * Return:
> + * 2	if there is no more data,
> + * 1	if new receiving (input) data is ready and can be written to
> + *	device

This looks weird, if this returns only two variables this should be
bool (or 0/non-zero or enum). Or you wanted to make it consistent with
AES-stuff?

> + */
> +static int s5p_hash_rx(struct s5p_aes_dev *dev)
> +{
> +	int ret = 2;
> +
> +	if (dev->hash_sg_cnt > 0) {
> +		dev->hash_sg_iter = sg_next(dev->hash_sg_iter);
> +		ret = 1;
> +	} else {
> +		set_bit(HASH_FLAGS_DMA_READY, &dev->hash_flags);
> +	}
> +
> +	return ret;
> +}
> +
>  static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
>  {
>  	struct platform_device *pdev = dev_id;
>  	struct s5p_aes_dev *dev = platform_get_drvdata(pdev);
>  	int err_dma_tx = 0;
>  	int err_dma_rx = 0;
> +	int err_dma_hx = 0;
>  	bool tx_end = false;
> +	bool hx_end = false;
>  	unsigned long flags;
> -	uint32_t status;
> +	u32 status, st_bits;
>  	int err;
>  
>  	spin_lock_irqsave(&dev->lock, flags);
> -

No cleanups mixed with real change. This is already a big patch...

>  	/*
>  	 * Handle rx or tx interrupt. If there is still data (scatterlist did not
>  	 * reach end), then map next scatterlist entry.
> @@ -456,6 +734,8 @@ static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
>  	 *
>  	 * If there is no more data in tx scatter list, call s5p_aes_complete()
>  	 * and schedule new tasklet.
> +	 *
> +	 * Handle hx interrupt. If there is still data map next entry.
>  	 */
>  	status = SSS_READ(dev, FCINTSTAT);
>  	if (status & SSS_FCINTSTAT_BRDMAINT)
> @@ -467,7 +747,29 @@ static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
>  		err_dma_tx = s5p_aes_tx(dev);
>  	}
>  
> -	SSS_WRITE(dev, FCINTPEND, status);
> +	if (status & SSS_FCINTSTAT_HRDMAINT)
> +		err_dma_hx = s5p_hash_rx(dev);
> +
> +	st_bits = status & (SSS_FCINTSTAT_BRDMAINT | SSS_FCINTSTAT_BTDMAINT |
> +				SSS_FCINTSTAT_HRDMAINT);
> +	/* clear DMA bits */

Why only DMA bits?

> +	SSS_WRITE(dev, FCINTPEND, st_bits);
> +
> +	/* clear HASH irq bits */
> +	if (status & (SSS_FCINTSTAT_HDONEINT | SSS_FCINTSTAT_HPARTINT)) {
> +		/* cannot have both HPART and HDONE */
> +		if (status & SSS_FCINTSTAT_HPARTINT)
> +			st_bits = SSS_HASH_STATUS_PARTIAL_DONE;
> +
> +		if (status & SSS_FCINTSTAT_HDONEINT)
> +			st_bits = SSS_HASH_STATUS_MSG_DONE;
> +
> +		set_bit(HASH_FLAGS_OUTPUT_READY, &dev->hash_flags);
> +		s5p_hash_write(dev, SSS_REG_HASH_STATUS, st_bits);
> +		hx_end = true;
> +		/* when DONE or PART, do not handle HASH DMA */
> +		err_dma_hx = 0;
> +	}
>  
>  	if (err_dma_rx < 0) {
>  		err = err_dma_rx;
> @@ -480,6 +782,8 @@ static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
>  
>  	if (tx_end) {
>  		s5p_sg_done(dev);
> +		if (err_dma_hx == 1)
> +			s5p_set_dma_hashdata(dev, dev->hash_sg_iter);
>  
>  		spin_unlock_irqrestore(&dev->lock, flags);
>  
> @@ -497,21 +801,1274 @@ static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
>  			s5p_set_dma_outdata(dev, dev->sg_dst);
>  		if (err_dma_rx == 1)
>  			s5p_set_dma_indata(dev, dev->sg_src);
> +		if (err_dma_hx == 1)
> +			s5p_set_dma_hashdata(dev, dev->hash_sg_iter);
>  
>  		spin_unlock_irqrestore(&dev->lock, flags);
>  	}
>  
> -	return IRQ_HANDLED;
> +	goto hash_irq_end;
>  
>  error:
>  	s5p_sg_done(dev);
>  	dev->busy = false;
> +	if (err_dma_hx == 1)
> +		s5p_set_dma_hashdata(dev, dev->hash_sg_iter);
> +
>  	spin_unlock_irqrestore(&dev->lock, flags);
>  	s5p_aes_complete(dev, err);
>  
> +hash_irq_end:
> +	/*
> +	 * Note about else if:
> +	 *   when hash_sg_iter reaches end and its UPDATE op,
> +	 *   issue SSS_HASH_PAUSE and wait for HPART irq
> +	 */
> +	if (hx_end)
> +		tasklet_schedule(&dev->hash_tasklet);
> +	else if ((err_dma_hx == 2) &&
> +		!test_bit(HASH_FLAGS_FINAL, &dev->hash_flags))
> +		s5p_hash_write(dev, SSS_REG_HASH_CTRL_PAUSE,
> +			       SSS_HASH_PAUSE);
> +
>  	return IRQ_HANDLED;
>  }
>  
> +/**
> + * s5p_hash_read_msg - read message or IV from HW
> + * @req:	AHASH request
> + */
> +static void s5p_hash_read_msg(struct ahash_request *req)
> +{
> +	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
> +	struct s5p_aes_dev *dd = ctx->dd;
> +	u32 *hash = (u32 *)ctx->digest;
> +	int i;
> +
> +	for (i = 0; i < ctx->nregs; i++)
> +		hash[i] = s5p_hash_read(dd, SSS_REG_HASH_OUT(i));
> +}
> +
> +/**
> + * s5p_hash_write_ctx_iv - write IV for next partial/finup op.
> + * @dd:		device
> + * @ctx:	request context
> + */
> +static void s5p_hash_write_ctx_iv(struct s5p_aes_dev *dd,
> +				  struct s5p_hash_reqctx *ctx)
> +{
> +	u32 *hash = (u32 *)ctx->digest;
> +	int i;
> +
> +	for (i = 0; i < ctx->nregs; i++)
> +		s5p_hash_write(dd, SSS_REG_HASH_IV(i), hash[i]);
> +}
> +
> +/**
> + * s5p_hash_write_iv - write IV for next partial/finup op.
> + * @req:	AHASH request
> + */
> +static void s5p_hash_write_iv(struct ahash_request *req)
> +{
> +	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
> +	struct s5p_aes_dev *dd = ctx->dd;
> +
> +	s5p_hash_write_ctx_iv(dd, ctx);
> +}
> +
> +/**
> + * s5p_hash_copy_result - copy digest into req->result
> + * @req:	AHASH request
> + */
> +static void s5p_hash_copy_result(struct ahash_request *req)
> +{
> +	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
> +	int d = ctx->nregs;
> +
> +	if (!req->result)
> +		return;
> +
> +	memcpy(req->result, (u8 *)ctx->digest, d * HASH_REG_SIZEOF);
> +}
> +
> +/**
> + * s5p_hash_dma_flush - flush HASH DMA
> + * @dev:	secss device
> + */
> +static void s5p_hash_dma_flush(struct s5p_aes_dev *dev)
> +{
> +	SSS_WRITE(dev, FCHRDMAC, SSS_FCHRDMAC_FLUSH);
> +}
> +
> +/**
> + * s5p_hash_dma_enable()
> + * @dev:	secss device
> + *
> + * enable DMA mode for HASH
> + */
> +static void s5p_hash_dma_enable(struct s5p_aes_dev *dev)
> +{
> +	s5p_hash_write(dev, SSS_REG_HASH_CTRL_FIFO, SSS_HASH_FIFO_MODE_DMA);
> +}
> +
> +/**
> + * s5p_hash_irq_disable - disable irq HASH signals
> + * @dev:	secss device
> + * @flags:	bitfield with irq's to be disabled
> + */
> +static void s5p_hash_irq_disable(struct s5p_aes_dev *dev, u32 flags)
> +{
> +	SSS_WRITE(dev, FCINTENCLR, flags);
> +}
> +
> +/**
> + * s5p_hash_irq_enable - enable irq signals
> + * @dev:	secss device
> + * @flags:	bitfield with irq's to be enabled
> + */
> +static void s5p_hash_irq_enable(struct s5p_aes_dev *dev, int flags)
> +{
> +	SSS_WRITE(dev, FCINTENSET, flags);
> +}
> +
> +/**
> + * s5p_hash_set_flow()
> + * @dev:	secss device
> + * @hashflow:	HASH stream flow with/without crypto AES/DES
> + */
> +static void s5p_hash_set_flow(struct s5p_aes_dev *dev, u32 hashflow)
> +{
> +	unsigned long flags;
> +	u32 flow;
> +
> +	spin_lock_irqsave(&dev->lock, flags);
> +
> +	flow = SSS_READ(dev, FCFIFOCTRL);
> +
> +	hashflow &= SSS_HASHIN_MASK;
> +	flow &= ~SSS_HASHIN_MASK;
> +	flow |= hashflow;
> +
> +	SSS_WRITE(dev, FCFIFOCTRL, hashflow);
> +
> +	spin_unlock_irqrestore(&dev->lock, flags);
> +}
> +
> +/**
> + * s5p_ahash_dma_init -
> + * @dev:	secss device
> + * @hashflow:	HASH stream flow with/without AES/DES
> + *
> + * flush HASH DMA and enable DMA,
> + * set HASH stream flow inside SecSS HW
> + * enable HASH irq's HRDMA, HDONE, HPART
> + */
> +static void s5p_ahash_dma_init(struct s5p_aes_dev *dev, u32 hashflow)
> +{
> +	s5p_hash_irq_disable(dev, SSS_FCINTENCLR_HRDMAINTENCLR |
> +			     SSS_FCINTENCLR_HDONEINTENCLR |
> +			     SSS_FCINTENCLR_HPARTINTENCLR);
> +	s5p_hash_dma_flush(dev);
> +
> +	s5p_hash_dma_enable(dev);
> +	s5p_hash_set_flow(dev, hashflow);
> +
> +	s5p_hash_irq_enable(dev, SSS_FCINTENSET_HRDMAINTENSET |
> +			    SSS_FCINTENSET_HDONEINTENSET |
> +			    SSS_FCINTENSET_HPARTINTENSET);
> +}
> +
> +/**
> + * s5p_hash_hw_init -
> + * @dev:	secss device
> + */
> +static int s5p_hash_hw_init(struct s5p_aes_dev *dev)
> +{
> +	set_bit(HASH_FLAGS_INIT, &dev->hash_flags);
> +	s5p_ahash_dma_init(dev, SSS_HASHIN_INDEPENDENT);
> +
> +	return 0;
> +}
> +
> +/**
> + * s5p_hash_write_ctrl -
> + * @dd:		secss device
> + * @length:	length for request
> + * @final:	0=not final
> + *
> + * Prepare SSS HASH block for processing bytes in DMA mode.
> + * If it is called after previous updates, fill up IV words.
> + * For final, calculate and set lengths for SSS HASH so it can
> + * finalize hash.
> + * For partial, set SSS HASH length as 2^63 so it will be never
> + * reached and set to zero prelow and prehigh.
> + *
> + * This function do not start DMA transfer.
> + */
> +static void s5p_hash_write_ctrl(struct s5p_aes_dev *dd, size_t length,
> +				int final)
> +{
> +	struct s5p_hash_reqctx *ctx = ahash_request_ctx(dd->hash_req);
> +	u32 configflags, swapflags;
> +	u32 prelow, prehigh, low, high;
> +	u64 tmplen;
> +
> +	configflags = ctx->engine | SSS_HASH_INIT_BIT;
> +
> +	if (likely(ctx->digcnt)) {
> +		s5p_hash_write_ctx_iv(dd, ctx);
> +		configflags |= SSS_HASH_USER_IV_EN;
> +	}
> +
> +	if (final) {
> +		/* number of bytes for last part */
> +		low = length; high = 0;
> +		/* total number of bits prev hashed */
> +		tmplen = ctx->digcnt * 8;
> +		prelow = (u32)tmplen;
> +		prehigh = (u32)(tmplen >> 32);
> +	} else {
> +		prelow = 0; prehigh = 0;
> +		low = 0; high = BIT(31);
> +	}
> +
> +	swapflags = SSS_HASH_BYTESWAP_DI | SSS_HASH_BYTESWAP_DO |
> +		    SSS_HASH_BYTESWAP_IV | SSS_HASH_BYTESWAP_KEY;
> +
> +	s5p_hash_write(dd, SSS_REG_HASH_MSG_SIZE_LOW, low);
> +	s5p_hash_write(dd, SSS_REG_HASH_MSG_SIZE_HIGH, high);
> +	s5p_hash_write(dd, SSS_REG_HASH_PRE_MSG_SIZE_LOW, prelow);
> +	s5p_hash_write(dd, SSS_REG_HASH_PRE_MSG_SIZE_HIGH, prehigh);
> +
> +	s5p_hash_write(dd, SSS_REG_HASH_CTRL_SWAP, swapflags);
> +	s5p_hash_write(dd, SSS_REG_HASH_CTRL, configflags);
> +}
> +
> +/**
> + * s5p_hash_xmit_dma - start DMA hash processing
> + * @dd:		secss device
> + * @length:	length for request
> + * @final:	0=not final
> + *
> + * Map ctx->sg into DMA_TO_DEVICE,
> + * remember sg and cnt in device dd->hash_sg_iter, dd->hash_sg_cnt
> + * so it can be used in loop inside irq handler.
> + * Update ctx->digcnt, need this to keep number of processed bytes
> + * for last final/finup request.
> + * Set dma address and length, this starts DMA,
> + * return with -EINPROGRESS.
> + * HW HASH block will issue signal for irq handler.
> + */
> +static int s5p_hash_xmit_dma(struct s5p_aes_dev *dd, size_t length,
> +			      int final)
> +{
> +	struct s5p_hash_reqctx *ctx = ahash_request_ctx(dd->hash_req);
> +	int cnt;
> +
> +	dev_dbg(dd->dev, "xmit_dma: digcnt: %lld, length: %u, final: %d\n",
> +						ctx->digcnt, length, final);
> +
> +	cnt = dma_map_sg(dd->dev, ctx->sg, ctx->sg_len, DMA_TO_DEVICE);
> +	if (!cnt) {
> +		dev_err(dd->dev, "dma_map_sg error\n");
> +		set_bit(HASH_FLAGS_ERROR, &ctx->flags);
> +		return -EINVAL;
> +	}
> +
> +	set_bit(HASH_FLAGS_DMA_ACTIVE, &dd->hash_flags);
> +	dd->hash_sg_iter = ctx->sg;
> +	dd->hash_sg_cnt = cnt;
> +	s5p_hash_write_ctrl(dd, length, final);
> +	/* update digcnt in request */
> +	ctx->digcnt += length;
> +	ctx->total -= length;
> +
> +	/* catch last interrupt */
> +	if (final)
> +		set_bit(HASH_FLAGS_FINAL, &dd->hash_flags);
> +
> +	s5p_set_dma_hashdata(dd, dd->hash_sg_iter); /* DMA starts */
> +
> +	return -EINPROGRESS;
> +}
> +
> +/**
> + * s5p_hash_copy_sgs -
> + * @ctx:	request context
> + * @sg:		source scatterlist request
> + * @bs:		block size
> + * @new_len:	number of bytes to process from sg
> + *
> + * Allocate new buffer, copy data for HASH into it.
> + * If there was xmit_buf filled, copy it first, then
> + * copy data from sg into it.
> + * Prepare one sgl[0] with allocated buffer.
> + *
> + * Set ctx->sg to sgl[0].
> + * Set flag so we can free it after irq ends processing.
> + */
> +static int s5p_hash_copy_sgs(struct s5p_hash_reqctx *ctx,
> +			     struct scatterlist *sg, int bs, int new_len)
> +{
> +	int pages;
> +	void *buf;
> +	int len;
> +
> +	len = new_len + ctx->bufcnt;
> +	pages = get_order(len);
> +
> +	buf = (void *)__get_free_pages(GFP_ATOMIC, pages);
> +	if (!buf) {
> +		dev_err(ctx->dd->dev, "alloc pages for unaligned case.\n");
> +		set_bit(HASH_FLAGS_ERROR, &ctx->flags);
> +		return -ENOMEM;
> +	}
> +
> +	if (ctx->bufcnt)
> +		memcpy(buf, ctx->dd->xmit_buf, ctx->bufcnt);
> +
> +	scatterwalk_map_and_copy(buf + ctx->bufcnt, sg, ctx->skip,
> +				 new_len, 0);
> +	sg_init_table(ctx->sgl, 1);
> +	sg_set_buf(ctx->sgl, buf, len);
> +	ctx->sg = ctx->sgl;
> +	ctx->sg_len = 1;
> +	ctx->bufcnt = 0;
> +	ctx->skip = 0;
> +	set_bit(HASH_FLAGS_SGS_COPIED, &ctx->dd->hash_flags);
> +
> +	return 0;
> +}
> +
> +/**
> + * s5p_hash_copy_sg_lists -
> + * @rctx:	request context
> + * @sg:		source scatterlist request
> + * @bs:		block size
> + * @new_len:	number of bytes to process from sg
> + *
> + * Allocate new scatterlist table, copy data for HASH into it.
> + * If there was xmit_buf filled, prepare it first, then
> + * copy page, length and offset from source sg into it,
> + * adjusting begin and/or end for skip offset and hash_later value.
> + *
> + * Resulting sg table will be assigned to ctx->sg.
> + * Set flag so we can free it after irq ends processing.
> + */
> +static int s5p_hash_copy_sg_lists(struct s5p_hash_reqctx *ctx,
> +				  struct scatterlist *sg, int bs, int new_len)
> +{
> +	int n = sg_nents(sg);
> +	struct scatterlist *tmp;
> +	int offset = ctx->skip;

Here and in some other places - while declaring many variables, some
preassigned some note, please use some consistency. It is a matter of
taste but usually this would improve readability. Preferably - looking
at existing code in s5p-sss.c - first declarations with assignments,
then rest of declarations. Lines in each group ordered with
reversed-christmas-tree.  Something like in existing
s5p_aes_interrupt(), although there order comes also from code flow.

> +
> +	if (ctx->bufcnt)
> +		n++;
> +
> +	ctx->sg = kmalloc_array(n, sizeof(*sg), GFP_KERNEL);
> +	if (!ctx->sg) {
> +		set_bit(HASH_FLAGS_ERROR, &ctx->flags);
> +		return -ENOMEM;
> +	}
> +
> +	sg_init_table(ctx->sg, n);
> +
> +	tmp = ctx->sg;
> +
> +	ctx->sg_len = 0;
> +
> +	if (ctx->bufcnt) {
> +		sg_set_buf(tmp, ctx->dd->xmit_buf, ctx->bufcnt);
> +		tmp = sg_next(tmp);
> +		ctx->sg_len++;
> +	}
> +
> +	while (sg && new_len) {
> +		int len = sg->length - offset;
> +
> +		if (offset) {
> +			offset -= sg->length;
> +			if (offset < 0)
> +				offset = 0;
> +		}
> +
> +		if (new_len < len)
> +			len = new_len;
> +
> +		if (len > 0) {
> +			new_len -= len;
> +			sg_set_page(tmp, sg_page(sg), len, sg->offset);
> +			if (new_len <= 0)
> +				sg_mark_end(tmp);
> +			tmp = sg_next(tmp);
> +			ctx->sg_len++;
> +		}
> +
> +		sg = sg_next(sg);
> +	}
> +
> +	set_bit(HASH_FLAGS_SGS_ALLOCED, &ctx->dd->hash_flags);
> +
> +	ctx->bufcnt = 0;
> +
> +	return 0;
> +}
> +
> +/**
> + * s5p_hash_prepare_sgs -
> + * @sg:		source scatterlist request
> + * @nbytes:	number of bytes to process from sg
> + * @bs:		block size
> + * @final:	final flag
> + * @rctx:	request context
> + *
> + * Check two conditions: (1) if buffers in sg have len aligned data,
> + * and (2) sg table have good aligned elements (list_ok)
> + * If one of this checks fails, then either
> + * (1) allocates new buffer for data with s5p_hash_copy_sgs,
> + * copy data into this buffer and prepare request in sgl, or
> + * (2) allocates new sg table and prepare sg elements
> + *
> + * For digest or finup all conditions can be good, and we may not need
> + * any fixes.
> + */
> +static int s5p_hash_prepare_sgs(struct scatterlist *sg,
> +				int nbytes, int bs, bool final,
> +				struct s5p_hash_reqctx *rctx)
> +{
> +	int n = 0;
> +	bool aligned = true;
> +	bool list_ok = true;
> +	struct scatterlist *sg_tmp = sg;
> +	int offset = rctx->skip;
> +	int new_len;
> +
> +	if (!sg || !sg->length || !nbytes)
> +		return 0;
> +
> +	new_len = nbytes;
> +
> +	if (offset)
> +		list_ok = false;
> +
> +	if (!final)
> +		list_ok = false;
> +
> +	while (nbytes > 0 && sg_tmp) {
> +		n++;
> +
> +		if (offset < sg_tmp->length) {
> +			if (!IS_ALIGNED(sg_tmp->length - offset, bs)) {
> +				aligned = false;
> +				break;
> +			}
> +		}
> +
> +		if (!sg_tmp->length) {
> +			aligned = false;
> +			break;
> +		}
> +
> +		if (offset) {
> +			offset -= sg_tmp->length;
> +			if (offset < 0) {
> +				nbytes += offset;
> +				offset = 0;
> +			}
> +		} else {
> +			nbytes -= sg_tmp->length;
> +		}
> +
> +		sg_tmp = sg_next(sg_tmp);
> +
> +		if (nbytes < 0) { /* when hash_later is > 0 */
> +			list_ok = false;
> +			break;
> +		}
> +	}
> +
> +	if (!aligned)
> +		return s5p_hash_copy_sgs(rctx, sg, bs, new_len);
> +	else if (!list_ok)
> +		return s5p_hash_copy_sg_lists(rctx, sg, bs, new_len);
> +
> +	/* have aligned data from previous operation and/or current
> +	 * Note: will enter here only if (digest or finup) and aligned
> +	 */
> +	if (rctx->bufcnt) {
> +		rctx->sg_len = n;
> +		sg_init_table(rctx->sgl, 2);
> +		sg_set_buf(rctx->sgl, rctx->dd->xmit_buf, rctx->bufcnt);
> +		sg_chain(rctx->sgl, 2, sg);
> +		rctx->sg = rctx->sgl;
> +		rctx->sg_len++;
> +	} else {
> +		rctx->sg = sg;
> +		rctx->sg_len = n;
> +	}
> +
> +	return 0;
> +}
> +
> +/**
> + * s5p_hash_prepare_request -
> + * @req:	AHASH request
> + * @update:	true if UPDATE op
> + *
> + * Note 1: we can have update flag _and_ final flag at the same time.
> + * Note 2: we enter here when digcnt > BUFLEN (=HASH_BLOCK_SIZE) or
> + *	   either req->nbytes or ctx->bufcnt + req->nbytes is > BUFLEN or
> + *	   we have final op
> + */
> +static int s5p_hash_prepare_request(struct ahash_request *req, bool update)
> +{
> +	struct s5p_hash_reqctx *rctx = ahash_request_ctx(req);
> +	int bs;

I do not see the reason for 'bs'. It is set once and then only read.

> +	int ret;
> +	int nbytes;
> +	bool final = rctx->flags & BIT(HASH_FLAGS_FINUP);
> +	int xmit_len, hash_later;
> +
> +	if (!req)
> +		return 0;
> +
> +	bs = BUFLEN;
> +	if (update)
> +		nbytes = req->nbytes;
> +	else
> +		nbytes = 0;
> +
> +	rctx->total = nbytes + rctx->bufcnt;
> +	if (!rctx->total)
> +		return 0;
> +
> +	if (nbytes && (!IS_ALIGNED(rctx->bufcnt, BUFLEN))) {
> +		/* bytes left from previous request, so fill up to BUFLEN */
> +		int len = BUFLEN - rctx->bufcnt % BUFLEN;
> +
> +		if (len > nbytes)
> +			len = nbytes;
> +
> +		scatterwalk_map_and_copy(rctx->buffer + rctx->bufcnt, req->src,
> +					 0, len, 0);
> +		rctx->bufcnt += len;
> +		nbytes -= len;
> +		rctx->skip = len;
> +	} else {
> +		rctx->skip = 0;
> +	}
> +
> +	if (rctx->bufcnt)
> +		memcpy(rctx->dd->xmit_buf, rctx->buffer, rctx->bufcnt);
> +
> +	xmit_len = rctx->total;
> +	if (final) {
> +		hash_later = 0;
> +	} else {
> +		if (IS_ALIGNED(xmit_len, bs))
> +			xmit_len -= bs;
> +		else
> +			xmit_len -= xmit_len & (bs - 1);
> +
> +		hash_later = rctx->total - xmit_len;
> +		WARN_ON(req->nbytes == 0);
> +		WARN_ON(hash_later <= 0);
> +		/* == if bufcnt was BUFLEN */
> +		WARN_ON(req->nbytes < hash_later);
> +		WARN_ON(rctx->skip > (req->nbytes - hash_later));
> +		/* copy hash_later bytes from end of req->src */
> +		/* previous bytes are in xmit_buf, so no overwrite */
> +		scatterwalk_map_and_copy(rctx->buffer, req->src,
> +					 req->nbytes - hash_later,
> +					 hash_later, 0);
> +	}
> +
> +	WARN_ON(hash_later < 0);
> +	WARN_ON(nbytes < hash_later);
> +	if (xmit_len > bs) {
> +		WARN_ON(nbytes <= hash_later);
> +		ret = s5p_hash_prepare_sgs(req->src, nbytes - hash_later, bs,
> +					   final, rctx);
> +		if (ret)
> +			return ret;
> +	} else {
> +		/* have buffered data only */
> +		if (unlikely(!rctx->bufcnt)) {
> +			/* first update didn't fill up buffer */
> +			WARN_ON(xmit_len != BUFLEN);

You have pretty a lot of WARNs. This raises concerns...

> +			scatterwalk_map_and_copy(rctx->dd->xmit_buf, req->src,
> +				0, xmit_len, 0);
> +		}
> +
> +		sg_init_table(rctx->sgl, 1);
> +		sg_set_buf(rctx->sgl, rctx->dd->xmit_buf, xmit_len);
> +
> +		rctx->sg = rctx->sgl;
> +		rctx->sg_len = 1;
> +	}
> +
> +	rctx->bufcnt = hash_later;
> +	if (!final)
> +		rctx->total = xmit_len;
> +
> +	return 0;
> +}
> +
> +/**
> + * s5p_hash_update_dma_stop()
> + * @dd:		secss device
> + *
> + * Unmap scatterlist ctx->sg.
> + */
> +static int s5p_hash_update_dma_stop(struct s5p_aes_dev *dd)
> +{
> +	struct s5p_hash_reqctx *ctx = ahash_request_ctx(dd->hash_req);
> +
> +	dma_unmap_sg(dd->dev, ctx->sg, ctx->sg_len, DMA_TO_DEVICE);
> +	clear_bit(HASH_FLAGS_DMA_ACTIVE, &dd->hash_flags);
> +
> +	return 0;
> +}
> +
> +/**
> + * s5p_hash_update_req - process AHASH request
> + * @dd:		device s5p_aes_dev
> + *
> + * Processes the input data from AHASH request using DMA
> + * Current request should have ctx->sg prepared before.
> + *
> + * Returns: see s5p_hash_final below.
> + */
> +static int s5p_hash_update_req(struct s5p_aes_dev *dd)
> +{
> +	struct ahash_request *req = dd->hash_req;
> +	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
> +	int err;
> +	bool final = ctx->flags & BIT(HASH_FLAGS_FINUP);
> +
> +	dev_dbg(dd->dev, "update_req: total: %u, digcnt: %lld, finup: %d\n",
> +		 ctx->total, ctx->digcnt, final);
> +
> +	err = s5p_hash_xmit_dma(dd, ctx->total, final);
> +
> +	/* wait for dma completion before can take more data */

Hmm... where is the wait?

> +	dev_dbg(dd->dev, "update: err: %d, digcnt: %lld\n", err, ctx->digcnt);

Do you really need this? If yes, then consistent prefix with previous.

> +
> +	return err;
> +}
> +
> +/**
> + * s5p_hash_final_req - process the final AHASH request
> + * @dd:		device s5p_aes_dev
> + *
> + * Processes the input data from the last AHASH request
> + * using . Resets the buffer counter (ctx->bufcnt)
> + *
> + * Returns: see s5p_hash_final below.
> + */
> +static int s5p_hash_final_req(struct s5p_aes_dev *dd)
> +{
> +	struct ahash_request *req = dd->hash_req;
> +	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
> +	int err = 0;
> +
> +	err = s5p_hash_xmit_dma(dd, ctx->total, 1);
> +	ctx->bufcnt = 0;
> +	dev_dbg(dd->dev, "final_req: err: %d\n", err);
> +
> +	return err;
> +}
> +
> +/**
> + * s5p_hash_finish - copy calculated digest to crypto layer
> + * @req:	AHASH request
> + *
> + * Copies the calculated hash value to the buffer provided
> + * by req->result
> + *
> + * Returns 0 on success and negative values on error.
> + */
> +static int s5p_hash_finish(struct ahash_request *req)
> +{
> +	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
> +	struct s5p_aes_dev *dd = ctx->dd;
> +	int err = 0;
> +
> +	if (ctx->digcnt)
> +		s5p_hash_copy_result(req);
> +
> +	dev_dbg(dd->dev, "digcnt: %lld, bufcnt: %d\n", ctx->digcnt,
> +		ctx->bufcnt);
> +
> +	return err;
> +}
> +
> +/**
> + * s5p_hash_finish_req - finish request
> + * @req:	AHASH request
> + * @err:	error
> + *
> + * Clear flags, free memory,
> + * if FINAL then read output into ctx->digest,
> + * call completetion
> + */
> +static void s5p_hash_finish_req(struct ahash_request *req, int err)
> +{
> +	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
> +	struct s5p_aes_dev *dd = ctx->dd;
> +
> +	if (test_bit(HASH_FLAGS_SGS_COPIED, &dd->hash_flags))
> +		free_pages((unsigned long)sg_virt(ctx->sg),
> +			   get_order(ctx->sg->length));
> +
> +	if (test_bit(HASH_FLAGS_SGS_ALLOCED, &dd->hash_flags))
> +		kfree(ctx->sg);
> +
> +	ctx->sg = NULL;
> +
> +	dd->hash_flags &= ~(BIT(HASH_FLAGS_SGS_ALLOCED) |
> +			    BIT(HASH_FLAGS_SGS_COPIED));
> +
> +	if (!err && !test_bit(HASH_FLAGS_ERROR, &ctx->flags)) {
> +		s5p_hash_read_msg(req);
> +		if (test_bit(HASH_FLAGS_FINAL, &dd->hash_flags))
> +			err = s5p_hash_finish(req);
> +	} else {
> +		ctx->flags |= BIT(HASH_FLAGS_ERROR);
> +	}
> +
> +	/* atomic operation is not needed here */

Ok, but why?

> +	dd->hash_flags &= ~(BIT(HASH_FLAGS_BUSY) | BIT(HASH_FLAGS_FINAL) |
> +			    BIT(HASH_FLAGS_DMA_READY) |
> +			    BIT(HASH_FLAGS_OUTPUT_READY));
> +
> +	if (req->base.complete)
> +		req->base.complete(&req->base, err);
> +}
> +
> +/**
> + * s5p_hash_handle_queue - handle hash queue
> + * @dd:		device s5p_aes_dev
> + * @req:	AHASH request
> + *
> + * If req!=NULL enqueue it
> + *
> + * Enqueues the current AHASH request on dd->queue and
> + * if FLAGS_BUSY is not set on the device then processes
> + * the first request from the dd->queue

Do not break lines too early. It makes reading difficult. Break at 80.

> + *
> + * Returns: see s5p_hash_final below.
> + */
> +static int s5p_hash_handle_queue(struct s5p_aes_dev *dd,
> +				  struct ahash_request *req)
> +{
> +	struct crypto_async_request *async_req, *backlog;
> +	struct s5p_hash_reqctx *ctx;
> +	unsigned long flags;
> +	int err = 0, ret = 0;
> +
> +retry:
> +	spin_lock_irqsave(&dd->hash_lock, flags);
> +	if (req)
> +		ret = ahash_enqueue_request(&dd->hash_queue, req);
> +	if (test_bit(HASH_FLAGS_BUSY, &dd->hash_flags)) {
> +		spin_unlock_irqrestore(&dd->hash_lock, flags);
> +		return ret;
> +	}
> +	backlog = crypto_get_backlog(&dd->hash_queue);
> +	async_req = crypto_dequeue_request(&dd->hash_queue);
> +	if (async_req)
> +		set_bit(HASH_FLAGS_BUSY, &dd->hash_flags);
> +	spin_unlock_irqrestore(&dd->hash_lock, flags);
> +
> +	if (!async_req)
> +		return ret;
> +
> +	if (backlog)
> +		backlog->complete(backlog, -EINPROGRESS);
> +
> +	req = ahash_request_cast(async_req);
> +	dd->hash_req = req;
> +	ctx = ahash_request_ctx(req);
> +
> +	err = s5p_hash_prepare_request(req, ctx->op == HASH_OP_UPDATE);
> +	if (err || !ctx->total)
> +		goto err1;
> +
> +	dev_dbg(dd->dev, "handling new req, op: %u, nbytes: %d\n",
> +						ctx->op, req->nbytes);
> +
> +	err = s5p_hash_hw_init(dd);
> +	if (err)
> +		goto err1;
> +
> +	dd->hash_err = 0;
> +	if (ctx->digcnt)
> +		/* request has changed - restore hash */
> +		s5p_hash_write_iv(req);
> +
> +	if (ctx->op == HASH_OP_UPDATE) {
> +		err = s5p_hash_update_req(dd);
> +		if (err != -EINPROGRESS &&
> +		   (ctx->flags & BIT(HASH_FLAGS_FINUP)))
> +			/* no final() after finup() */
> +			err = s5p_hash_final_req(dd);
> +	} else if (ctx->op == HASH_OP_FINAL) {
> +		err = s5p_hash_final_req(dd);
> +	}
> +err1:

Just "out" as this is normal and err path.

> +	dev_dbg(dd->dev, "exit, err: %d\n", err);

More meaningful debug message.

> +
> +	if (err != -EINPROGRESS) {
> +		/* hash_tasklet_cb will not finish it, so do it here */
> +		s5p_hash_finish_req(req, err);
> +		req = NULL;
> +
> +		/*
> +		 * Execute next request immediately if there is anything
> +		 * in queue.
> +		 */
> +		goto retry;
> +	}
> +
> +	return ret;
> +}
> +
> +/**
> + * s5p_hash_tasklet_cb - hash tasklet
> + * @data:	ptr to s5p_aes_dev
> + *
> + */
> +static void s5p_hash_tasklet_cb(unsigned long data)
> +{
> +	struct s5p_aes_dev *dd = (struct s5p_aes_dev *)data;
> +	int err = 0;
> +
> +	if (!test_bit(HASH_FLAGS_BUSY, &dd->hash_flags)) {
> +		s5p_hash_handle_queue(dd, NULL);
> +		return;
> +	}
> +
> +	if (test_bit(HASH_FLAGS_DMA_READY, &dd->hash_flags)) {
> +		if (test_and_clear_bit(HASH_FLAGS_DMA_ACTIVE,
> +				       &dd->hash_flags)) {
> +			s5p_hash_update_dma_stop(dd);
> +			if (dd->hash_err) {
> +				err = dd->hash_err;
> +				goto finish;
> +			}
> +		}
> +		if (test_and_clear_bit(HASH_FLAGS_OUTPUT_READY,
> +				       &dd->hash_flags)) {
> +			/* hash or semi-hash ready */
> +			clear_bit(HASH_FLAGS_DMA_READY, &dd->hash_flags);
> +				goto finish;
> +		}
> +	}
> +
> +	return;
> +
> +finish:
> +	dev_dbg(dd->dev, "update done: err: %d\n", err);

More meaningful debug message.

> +	/* finish curent request */
> +	s5p_hash_finish_req(dd->hash_req, err);
> +
> +	/* If we are not busy, process next req */
> +	if (!test_bit(HASH_FLAGS_BUSY, &dd->hash_flags))
> +		s5p_hash_handle_queue(dd, NULL);
> +}
> +
> +/**
> + * s5p_hash_enqueue - enqueue request
> + * @req:	AHASH request
> + * @op:		operation UPDATE or FINAL
> + *
> + * Sets the operation flag in the AHASH request context
> + * structure and calls s5p_hash_handle_queue().
> + *
> + * Returns: see s5p_hash_final below.
> + */
> +static int s5p_hash_enqueue(struct ahash_request *req, unsigned int op)
> +{
> +	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
> +	struct s5p_hash_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
> +	struct s5p_aes_dev *dd = tctx->dd;
> +
> +	ctx->op = op;
> +
> +	return s5p_hash_handle_queue(dd, req);
> +}
> +
> +/**
> + * s5p_hash_update - process the hash input data
> + * @req:	AHASH request
> + *
> + * If request will fit in buffer, copy it and return immediately
> + * else enqueue it wit OP_UPDATE.
> + *
> + * Returns: see s5p_hash_final below.
> + */
> +static int s5p_hash_update(struct ahash_request *req)
> +{
> +	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
> +
> +	if (!req->nbytes)
> +		return 0;
> +
> +	if (ctx->bufcnt + req->nbytes <= BUFLEN) {
> +		scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, req->src,
> +					 0, req->nbytes, 0);
> +		ctx->bufcnt += req->nbytes;
> +		return 0;
> +	}
> +
> +	return s5p_hash_enqueue(req, HASH_OP_UPDATE);
> +}
> +
> +/**
> + * s5p_hash_shash_digest - calculate shash digest
> + * @tfm:	crypto transformation
> + * @flags:	tfm flags
> + * @data:	input data
> + * @len:	length of data
> + * @out:	output buffer
> + */
> +static int s5p_hash_shash_digest(struct crypto_shash *tfm, u32 flags,
> +				  const u8 *data, unsigned int len, u8 *out)
> +{
> +	SHASH_DESC_ON_STACK(shash, tfm);
> +
> +	shash->tfm = tfm;
> +	shash->flags = flags & CRYPTO_TFM_REQ_MAY_SLEEP;
> +
> +	return crypto_shash_digest(shash, data, len, out);
> +}
> +
> +/**
> + * s5p_hash_final_shash - calculate shash digest
> + * @req:	AHASH request
> + *
> + * calculate digest from ctx->buffer,
> + * with data length ctx->bufcnt,
> + * store digest in req->result
> + */
> +static int s5p_hash_final_shash(struct ahash_request *req)
> +{
> +	struct s5p_hash_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
> +	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
> +
> +	return s5p_hash_shash_digest(tctx->fallback, req->base.flags,
> +				     ctx->buffer, ctx->bufcnt, req->result);
> +}
> +
> +/**
> + * s5p_hash_final - close up hash and calculate digest
> + * @req:	AHASH request
> + *
> + * Set FLAGS_FINUP flag for the current AHASH request context.
> + *
> + * If there were no input data processed yet and the buffered
> + * hash data is less than BUFLEN (64) then calculate the final
> + * hash immediately by using SW algorithm fallback.
> + *
> + * Otherwise enqueues the current AHASH request with OP_FINAL
> + * operation flag and finalize hash message in HW.
> + * Note that if digcnt!=0 then there were previous update op,
> + * so there are always some buffered bytes in ctx->buffer,
> + * which means that ctx->bufcnt!=0
> + *
> + * Returns:
> + * 0 if the request has been processed immediately,
> + * -EINPROGRESS if the operation has been queued for later
> + *	execution or is set to processing by HW,
> + * -EBUSY if queue is full and request should be resubmitted later,
> + * other negative values on error.
> + *
> + * Note: req->src do not have any data
> + */
> +static int s5p_hash_final(struct ahash_request *req)
> +{
> +	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
> +
> +	ctx->flags |= BIT(HASH_FLAGS_FINUP);
> +
> +	if (ctx->flags & BIT(HASH_FLAGS_ERROR))
> +		return -EINVAL; /* uncompleted hash is not needed */
> +
> +	/*
> +	 * If message is small (digcnt==0) and buffersize is less
> +	 * than BUFLEN, we use fallback, as using DMA + HW in this
> +	 * case doesn't provide any benefit.
> +	 * This is also the case for zero-length message.
> +	 */
> +	if (!ctx->digcnt && ctx->bufcnt < BUFLEN)
> +		return s5p_hash_final_shash(req);
> +
> +	WARN_ON(ctx->bufcnt == 0);
> +
> +	return s5p_hash_enqueue(req, HASH_OP_FINAL);
> +}
> +
> +/**
> + * s5p_hash_finup - process last req->src and calculate digest
> + * @req:	AHASH request containing the last update data
> + *
> + * Set FLAGS_FINUP flag in context.
> + * Call update(req) and exit if it was enqueued or is being processing.
> + * If update returns without enqueue, call final(req).
> + *
> + * Return values: see s5p_hash_final above.
> + */
> +static int s5p_hash_finup(struct ahash_request *req)
> +{
> +	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
> +	int err1, err2;
> +
> +	ctx->flags |= BIT(HASH_FLAGS_FINUP);
> +
> +	err1 = s5p_hash_update(req);
> +	if (err1 == -EINPROGRESS || err1 == -EBUSY)
> +		return err1;
> +	/*
> +	 * final() has to be always called to cleanup resources
> +	 * even if update() failed, except EINPROGRESS
> +	 * or calculate digest for small size
> +	 */
> +	err2 = s5p_hash_final(req);
> +
> +	return err1 ?: err2;
> +}
> +
> +/**
> + * s5p_hash_init - initialize AHASH request contex
> + * @req:	AHASH request
> + *
> + * Init async hash request context.
> + */
> +static int s5p_hash_init(struct ahash_request *req)
> +{
> +	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
> +	struct s5p_hash_ctx *tctx = crypto_ahash_ctx(tfm);
> +	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
> +	struct s5p_aes_dev *dd = tctx->dd;
> +
> +	ctx->dd = dd;
> +	ctx->flags = 0;
> +
> +	dev_dbg(dd->dev, "init: digest size: %d\n",
> +		crypto_ahash_digestsize(tfm));
> +
> +	switch (crypto_ahash_digestsize(tfm)) {
> +	case MD5_DIGEST_SIZE:
> +		ctx->flags |= HASH_FLAGS_MODE_MD5;
> +		ctx->engine = SSS_HASH_ENGINE_MD5;
> +		ctx->nregs = HASH_MD5_MAX_REG;
> +		break;
> +	case SHA1_DIGEST_SIZE:
> +		ctx->flags |= HASH_FLAGS_MODE_SHA1;
> +		ctx->engine = SSS_HASH_ENGINE_SHA1;
> +		ctx->nregs = HASH_SHA1_MAX_REG;
> +		break;
> +	case SHA256_DIGEST_SIZE:
> +		ctx->flags |= HASH_FLAGS_MODE_SHA256;
> +		ctx->engine = SSS_HASH_ENGINE_SHA256;
> +		ctx->nregs = HASH_SHA256_MAX_REG;
> +		break;
> +	}
> +
> +	ctx->bufcnt = 0;
> +	ctx->digcnt = 0;
> +	ctx->total = 0;
> +	ctx->skip = 0;
> +	ctx->buflen = BUFLEN;
> +
> +	return 0;
> +}
> +
> +/**
> + * s5p_hash_digest - calculate digest from req->src
> + * @req:	AHASH request
> + *
> + * Return values: see s5p_hash_final above.
> + */
> +static int s5p_hash_digest(struct ahash_request *req)
> +{
> +	return s5p_hash_init(req) ?: s5p_hash_finup(req);
> +}
> +
> +/**
> + * s5p_hash_cra_init_alg - init crypto alg transformation
> + * @tfm:	crypto transformation
> + */
> +static int s5p_hash_cra_init_alg(struct crypto_tfm *tfm)
> +{
> +	struct s5p_hash_ctx *tctx = crypto_tfm_ctx(tfm);
> +	const char *alg_name = crypto_tfm_alg_name(tfm);
> +
> +	tctx->dd = s5p_dev;
> +	/* Allocate a fallback and abort if it failed. */
> +	tctx->fallback = crypto_alloc_shash(alg_name, 0,
> +					    CRYPTO_ALG_NEED_FALLBACK);
> +	if (IS_ERR(tctx->fallback)) {
> +		pr_err("fallback alloc fails for '%s'\n", alg_name);
> +		return PTR_ERR(tctx->fallback);
> +	}
> +
> +	crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
> +				 sizeof(struct s5p_hash_reqctx) + BUFLEN);
> +
> +	return 0;
> +}
> +
> +/**
> + * s5p_hash_cra_init - init crypto tfm
> + * @tfm:	crypto transformation
> + */
> +static int s5p_hash_cra_init(struct crypto_tfm *tfm)
> +{
> +	return s5p_hash_cra_init_alg(tfm);
> +}
> +
> +/**
> + * s5p_hash_cra_exit - exit crypto tfm
> + * @tfm:	crypto transformation
> + *
> + * free allocated fallback
> + */
> +static void s5p_hash_cra_exit(struct crypto_tfm *tfm)
> +{
> +	struct s5p_hash_ctx *tctx = crypto_tfm_ctx(tfm);
> +
> +	crypto_free_shash(tctx->fallback);
> +	tctx->fallback = NULL;
> +}
> +
> +/**
> + * s5p_hash_export - export hash state
> + * @req:	AHASH request
> + * @out:	buffer for exported state
> + */
> +static int s5p_hash_export(struct ahash_request *req, void *out)
> +{
> +	struct s5p_hash_reqctx *rctx = ahash_request_ctx(req);
> +
> +	memcpy(out, rctx, sizeof(*rctx) + rctx->bufcnt);
> +
> +	return 0;
> +}
> +
> +/**
> + * s5p_hash_import - import hash state
> + * @req:	AHASH request
> + * @in:		buffer with state to be imported from
> + */
> +static int s5p_hash_import(struct ahash_request *req, const void *in)
> +{
> +	struct s5p_hash_reqctx *rctx = ahash_request_ctx(req);
> +	const struct s5p_hash_reqctx *ctx_in = in;
> +
> +	WARN_ON(ctx_in->bufcnt < 0);
> +	WARN_ON(ctx_in->bufcnt > BUFLEN);
> +	memcpy(rctx, in, sizeof(*rctx) + BUFLEN);
> +
> +	return 0;
> +}
> +
> +/**
> + * struct algs_sha1_md5

True. This is struct algs_sha1_md5.

> + */
> +static struct ahash_alg algs_sha1_md5[] = {
> +{
> +	.init		= s5p_hash_init,
> +	.update		= s5p_hash_update,
> +	.final		= s5p_hash_final,
> +	.finup		= s5p_hash_finup,
> +	.digest		= s5p_hash_digest,
> +	.halg.digestsize	= SHA1_DIGEST_SIZE,
> +	.halg.base	= {
> +		.cra_name		= "sha1",
> +		.cra_driver_name	= "exynos-sha1",
> +		.cra_priority		= 100,
> +		.cra_flags		= CRYPTO_ALG_TYPE_AHASH |
> +					  CRYPTO_ALG_KERN_DRIVER_ONLY |
> +					  CRYPTO_ALG_ASYNC |
> +					  CRYPTO_ALG_NEED_FALLBACK,
> +		.cra_blocksize		= HASH_BLOCK_SIZE,
> +		.cra_ctxsize		= sizeof(struct s5p_hash_ctx),
> +		.cra_alignmask		= SSS_DMA_ALIGN_MASK,
> +		.cra_module		= THIS_MODULE,
> +		.cra_init		= s5p_hash_cra_init,
> +		.cra_exit		= s5p_hash_cra_exit,
> +	}
> +},
> +{
> +	.init		= s5p_hash_init,
> +	.update		= s5p_hash_update,
> +	.final		= s5p_hash_final,
> +	.finup		= s5p_hash_finup,
> +	.digest		= s5p_hash_digest,
> +	.halg.digestsize	= MD5_DIGEST_SIZE,
> +	.halg.base	= {
> +		.cra_name		= "md5",
> +		.cra_driver_name	= "exynos-md5",
> +		.cra_priority		= 100,
> +		.cra_flags		= CRYPTO_ALG_TYPE_AHASH |
> +					  CRYPTO_ALG_KERN_DRIVER_ONLY |
> +					  CRYPTO_ALG_ASYNC |
> +					  CRYPTO_ALG_NEED_FALLBACK,
> +		.cra_blocksize		= HASH_BLOCK_SIZE,
> +		.cra_ctxsize		= sizeof(struct s5p_hash_ctx),
> +		.cra_alignmask		= SSS_DMA_ALIGN_MASK,
> +		.cra_module		= THIS_MODULE,
> +		.cra_init		= s5p_hash_cra_init,
> +		.cra_exit		= s5p_hash_cra_exit,
> +	}
> +}
> +};
> +
> +/**
> + * struct algs_sha256

Exactly.

> + */
> +static struct ahash_alg algs_sha256[] = {
> +{
> +	.init		= s5p_hash_init,
> +	.update		= s5p_hash_update,
> +	.final		= s5p_hash_final,
> +	.finup		= s5p_hash_finup,
> +	.digest		= s5p_hash_digest,
> +	.halg.digestsize	= SHA256_DIGEST_SIZE,
> +	.halg.base	= {
> +		.cra_name		= "sha256",
> +		.cra_driver_name	= "exynos-sha256",
> +		.cra_priority		= 100,
> +		.cra_flags		= CRYPTO_ALG_TYPE_AHASH |
> +					  CRYPTO_ALG_KERN_DRIVER_ONLY |
> +					  CRYPTO_ALG_ASYNC |
> +					  CRYPTO_ALG_NEED_FALLBACK,
> +		.cra_blocksize		= HASH_BLOCK_SIZE,
> +		.cra_ctxsize		= sizeof(struct s5p_hash_ctx),
> +		.cra_alignmask		= SSS_DMA_ALIGN_MASK,
> +		.cra_module		= THIS_MODULE,
> +		.cra_init		= s5p_hash_cra_init,
> +		.cra_exit		= s5p_hash_cra_exit,
> +	}
> +}
> +};
> +
> +/**
> + * struct exynos_hash_algs_info

Yeah, I know that this is exynos_hash_algs_info.

> + */
> +static struct sss_hash_algs_info exynos_hash_algs_info[] = {

Can it be const?

> +	{
> +		.algs_list	= algs_sha1_md5,
> +		.size		= ARRAY_SIZE(algs_sha1_md5),
> +	},
> +	{
> +		.algs_list	= algs_sha256,
> +		.size		= ARRAY_SIZE(algs_sha256),
> +	},
> +};
> +
>  static void s5p_set_aes(struct s5p_aes_dev *dev,
>  			uint8_t *key, uint8_t *iv, unsigned int keylen)
>  {
> @@ -822,13 +2379,16 @@ static struct crypto_alg algs[] = {
>  	},
>  };
>  
> +bool use_hash;

No globals. This should not be a file-scope variable neither.

> +
>  static int s5p_aes_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> -	int i, j, err = -ENODEV;
> +	int i, hash_i, hash_algs_size = 0, j, err = -ENODEV;
>  	struct samsung_aes_variant *variant;
>  	struct s5p_aes_dev *pdata;
>  	struct resource *res;
> +	struct sss_hash_algs_info *hash_algs_i;
>  
>  	if (s5p_dev)
>  		return -EEXIST;
> @@ -837,12 +2397,38 @@ static int s5p_aes_probe(struct platform_device *pdev)
>  	if (!pdata)
>  		return -ENOMEM;
>  
> +	variant = find_s5p_sss_version(pdev);
> +	pdata->pdata = variant;
> +
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
> -	if (IS_ERR(pdata->ioaddr))
> -		return PTR_ERR(pdata->ioaddr);
> +	/* HACK: HASH and PRNG uses the same registers in secss,
> +	 * avoid overwrite each other. This will drop HASH when
> +	 * CONFIG_EXYNOS_RNG is enabled.
> +	 * We need larger size for HASH registers in secss, current
> +	 * describe only AES/DES


Run checkpatch.

> +	 */
> +	if (variant == &exynos_aes_data) {
> +		pdata->pdata->hash_algs_info = exynos_hash_algs_info;
> +		pdata->pdata->hash_algs_size =
> +			ARRAY_SIZE(exynos_hash_algs_info);
> +#ifdef CONFIG_CRYPTO_DEV_EXYNOS_HASH
> +		res->end += 0x300;
> +		use_hash = true;
> +#endif
> +	}
>  
> -	variant = find_s5p_sss_version(pdev);
> +	pdata->res = res;
> +	pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(pdata->ioaddr)) {
> +		if (!use_hash)
> +			return PTR_ERR(pdata->ioaddr);
> +		/* try AES without HASH */
> +		res->end -= 0x300;
> +		use_hash = false;
> +		pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
> +		if (IS_ERR(pdata->ioaddr))
> +			return PTR_ERR(pdata->ioaddr);
> +	}
>  
>  	pdata->clk = devm_clk_get(dev, "secss");
>  	if (IS_ERR(pdata->clk)) {
> @@ -857,8 +2443,10 @@ static int s5p_aes_probe(struct platform_device *pdev)
>  	}
>  
>  	spin_lock_init(&pdata->lock);
> +	spin_lock_init(&pdata->hash_lock);
>  
>  	pdata->aes_ioaddr = pdata->ioaddr + variant->aes_offset;
> +	pdata->io_hash_base = pdata->ioaddr + variant->hash_offset;
>  
>  	pdata->irq_fc = platform_get_irq(pdev, 0);
>  	if (pdata->irq_fc < 0) {
> @@ -877,6 +2465,7 @@ static int s5p_aes_probe(struct platform_device *pdev)
>  	pdata->busy = false;
>  	pdata->dev = dev;
>  	platform_set_drvdata(pdev, pdata);
> +

Separate patch.

>  	s5p_dev = pdata;
>  
>  	tasklet_init(&pdata->tasklet, s5p_tasklet_cb, (unsigned long)pdata);
> @@ -884,17 +2473,58 @@ static int s5p_aes_probe(struct platform_device *pdev)
>  
>  	for (i = 0; i < ARRAY_SIZE(algs); i++) {
>  		err = crypto_register_alg(&algs[i]);
> -		if (err)
> +		if (err) {
> +			dev_err(dev, "can't register '%s': %d\n",
> +				algs[i].cra_name, err);

Looks like candidate for separate patch.

>  			goto err_algs;
> +		}
> +	}
> +
> +	if (use_hash) {
> +		hash_algs_size = pdata->pdata->hash_algs_size;
> +		tasklet_init(&pdata->hash_tasklet, s5p_hash_tasklet_cb,
> +			(unsigned long)pdata);
> +		crypto_init_queue(&pdata->hash_queue, SSS_HASH_QUEUE_LENGTH);
> +	}
> +
> +	for (hash_i = 0; hash_i < hash_algs_size; hash_i++) {
> +		hash_algs_i = pdata->pdata->hash_algs_info;
> +		hash_algs_i[hash_i].registered = 0;
> +		for (j = 0; j < hash_algs_i[hash_i].size; j++) {
> +			struct ahash_alg *alg;
> +
> +			alg = &(hash_algs_i[hash_i].algs_list[j]);
> +			alg->export = s5p_hash_export;
> +			alg->import = s5p_hash_import;
> +			alg->halg.statesize = sizeof(struct s5p_hash_reqctx) +
> +					      BUFLEN;
> +			err = crypto_register_ahash(alg);
> +			if (err) {
> +				dev_err(dev, "can't register '%s': %d\n",
> +					alg->halg.base.cra_driver_name, err);
> +				goto err_hash;
> +			}
> +
> +			hash_algs_i[hash_i].registered++;
> +		}
>  	}
>  
>  	dev_info(dev, "s5p-sss driver registered\n");
>  
>  	return 0;
>  
> -err_algs:
> -	dev_err(dev, "can't register '%s': %d\n", algs[i].cra_name, err);
> +err_hash:
> +	for (hash_i = hash_algs_size - 1; hash_i >= 0; hash_i--)
> +		for (j = hash_algs_i[hash_i].registered - 1;
> +		     j >= 0; j--)
> +			crypto_unregister_ahash(
> +				&(hash_algs_i[hash_i].algs_list[j]));
> +
> +	tasklet_kill(&pdata->hash_tasklet);
> +	res->end -= 0x300;
> +	use_hash = false;
>  
> +err_algs:
>  	for (j = 0; j < i; j++)
>  		crypto_unregister_alg(&algs[j]);
>  
> @@ -911,7 +2541,8 @@ static int s5p_aes_probe(struct platform_device *pdev)
>  static int s5p_aes_remove(struct platform_device *pdev)
>  {
>  	struct s5p_aes_dev *pdata = platform_get_drvdata(pdev);
> -	int i;
> +	struct sss_hash_algs_info *hash_algs_i;
> +	int i, j;
>  
>  	if (!pdata)
>  		return -ENODEV;
> @@ -919,10 +2550,19 @@ static int s5p_aes_remove(struct platform_device *pdev)
>  	for (i = 0; i < ARRAY_SIZE(algs); i++)
>  		crypto_unregister_alg(&algs[i]);
>  
> -	tasklet_kill(&pdata->tasklet);
> +	if (use_hash) {
> +		hash_algs_i = pdata->pdata->hash_algs_info;
> +		for (i = pdata->pdata->hash_algs_size - 1; i >= 0; i--)
> +			for (j = hash_algs_i[i].registered - 1; j >= 0; j--)
> +				crypto_unregister_ahash(
> +					&(hash_algs_i[i].algs_list[j]));
> +		pdata->res->end -= 0x300;
> +		tasklet_kill(&pdata->hash_tasklet);
> +		use_hash = false;
> +	}
>  
> +	tasklet_kill(&pdata->tasklet);

Why this line is in this commit? There is no change here...

Best regards,
Krzysztof


>  	clk_disable_unprepare(pdata->clk);
> -
>  	s5p_dev = NULL;
>  
>  	return 0;
> @@ -942,3 +2582,4 @@ module_platform_driver(s5p_aes_crypto);
>  MODULE_DESCRIPTION("S5PV210 AES hw acceleration support.");
>  MODULE_LICENSE("GPL v2");
>  MODULE_AUTHOR("Vladimir Zapolskiy <vzapolskiy@xxxxxxxxx>");
> +MODULE_AUTHOR("Kamil Konieczny <k.konieczny@xxxxxxxxxxxxxxxxxxx>");
> -- 
> 2.14.1.536.g6867272d5b56
> 
> 
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