Re: [PATCH v3] crypto: s5p-sss: Add HASH support for Exynos

From: Krzysztof Kozlowski
Date: Sat Sep 30 2017 - 15:50:59 EST

Next message: Mario.Limonciello: "RE: [PATCH v3 0/8] Introduce support for Dell SMBIOS over WMI"
Previous message: Mario.Limonciello: "RE: [PATCH v3 5/8] platform/x86: dell-wmi-smbios: introduce character device for userspace"
In reply to: Kamil Konieczny: "[PATCH v3] crypto: s5p-sss: Add HASH support for Exynos"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

On Wed, Sep 27, 2017 at 02:25:50PM +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 3:
> - many fixes suggested by Krzysztof Kozlowski: comments, uppercases in const,
> remove unused defines, remove unused variable bs, constify aes_variant,
> remove global var use_hash, remove WARN_ON, improve hash_import(),
> change goto label into 'out' in s5p_hash_handle_queue(), reorder variable
> declarations, add spinlock to protect clearing HASH_FLAGS_BUSY
> - simplify code: replace one-line functions s5p_hash_update_req(),
> s5p_hash_final_req() with call to s5p_hash_xmit_dma(), and delete them
> - replace call to s5p_hash_hw_init() into s5p_ahash_dma_init() and delete it
> - fix clearing shash flag CRYPTO_TFM_REQ_MAY_SLEEP
> - fix s5p_hash_set_flow()

Thanks for the changes, looks better.

>
> 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
>
> drivers/crypto/Kconfig | 14 +
> drivers/crypto/s5p-sss.c | 1507 +++++++++++++++++++++++++++++++++++++++++++++-
> 2 files changed, 1509 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
> index fe33c199fc1a..01cf07ce34c5 100644
> --- a/drivers/crypto/Kconfig
> +++ b/drivers/crypto/Kconfig
> @@ -439,6 +439,20 @@ 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.
> + This will select software SHA1, MD5 and SHA256 as they are
> + needed for small and zero-size messages.
> + 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..e801ec4bfd8e 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)
> #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 +163,107 @@
> #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
> +
> +#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_HASH_IV(s) (0xB0 + ((s) << 2))
> +#define SSS_REG_HASH_OUT(s) (0x100 + ((s) << 2))
> +
> +#define HASH_BLOCK_SIZE 64
> +#define HASH_REG_SIZEOF 4
> +#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)
> +
> +/*
> + * HASH bit numbers, used by device, setting in dev->hash_flags with
> + * functions set_bit(), clear_bit() or tested with test_bit() or BIT(),
> + * to keep HASH state BUSY or FREE, or to signal state from irq_handler
> + * to hash_tasklet. SGS keep track of allocated memory for scatterlist
> + */
> +#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_DMA_READY 4
> +#define HASH_FLAGS_SGS_COPIED 5
> +#define HASH_FLAGS_SGS_ALLOCED 6
> +
> +/*
> + * HASH bit numbers used in request context
> + * FINUP mark last hash operation
> + */
> +#define HASH_FLAGS_FINUP 7
> +#define HASH_FLAGS_ERROR 8

I spent some time on s5p_hash_finish_req() and other code around flags,
confused by two different flags (ctx->flags, device->hash_flags) and
different API used to play with them next to each other (once test_bit,
line later just |=).

This is just confusing. AFAIU, you use only two bits in ctx->flags, so
just convert it to two bools. This will remove the confuse:
1. between the defines before and here,
2. around mixing xxx_bit() and regular |= operations.

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

No changes here... I asked for making this consistent with current code
so please bring a patch which introduces new macro to existing code and
then re-use it for new code.

Dropping inconsistent code and then promising "I will fix it up later"
does not work.

> +
> +#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.
> *
> * Specifies platform specific configuration of SSS module.
> * Note: A structure for driver specific platform data is used for future
> @@ -156,6 +271,7 @@
> */
> struct samsung_aes_variant {
> unsigned int aes_offset;
> + unsigned int hash_offset;
> };
>
> struct s5p_aes_reqctx {
> @@ -194,7 +310,22 @@ 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).

Why wrapping this line?

> + * @res: Resources for hash.
> + * @io_hash_base: Per-variant offset for HASH block IO memory.
> + * @hash_lock: Lock for protecting hash_req, hash_queue and hash_flags
> + * variable.
> + * @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.
> + * @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.
> + *
> + * @hash_algs_info: HASH transformations provided by SecSS module.
> + * @hash_algs_size: size of hash_algs_info.
> */
> struct s5p_aes_dev {
> struct device *dev;
> @@ -215,16 +346,82 @@ 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; /* protect hash_ vars */
> + unsigned long hash_flags;
> + struct crypto_queue hash_queue;
> + struct tasklet_struct hash_tasklet;
> +
> + u8 xmit_buf[BUFLEN] SSS_ALIGNED;
> + struct ahash_request *hash_req;
> + struct scatterlist *hash_sg_iter;
> + int hash_sg_cnt;
> +
> + struct sss_hash_algs_info *hash_algs_info;
> + unsigned int hash_algs_size;
> };
>
> -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[]
> + * @nregs: Number of HW registers for digest or IV read/write
> + * @engine: Bits for selecting type of HASH in 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;
> +
> + int nregs; /* digest_size / sizeof(reg) */
> + u32 engine;
> +
> + struct scatterlist *sg;
> + int sg_len;
> + struct scatterlist sgl[2];
> + int skip;
> + unsigned int total;
> +
> + 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 = {
> .aes_offset = 0x4000,
> + .hash_offset = 0x6000,
> };
>
> static const 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 +451,8 @@ static inline struct samsung_aes_variant *find_s5p_sss_version
> platform_get_device_id(pdev)->driver_data;
> }
>
> +static struct s5p_aes_dev *s5p_dev;
> +
> static void s5p_set_dma_indata(struct s5p_aes_dev *dev, struct scatterlist *sg)
> {
> SSS_WRITE(dev, FCBRDMAS, sg_dma_address(sg));
> @@ -436,15 +635,70 @@ 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);
> +}
> +
> +/**
> + * s5p_set_dma_hashdata - start DMA with sg
> + * @dev: device
> + * @sg: scatterlist ready to DMA transmit
> + */
> +static void s5p_set_dma_hashdata(struct s5p_aes_dev *dev,
> + struct scatterlist *sg)
> +{
> + dev->hash_sg_cnt--;
> + 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 and it is UPDATE op
> + * 1 if new receiving (input) data is ready and can be written to
> + * device

Why wrapping so early?

> + * 0 if there is no more data and it is FINAL op
> + */
> +static int s5p_hash_rx(struct s5p_aes_dev *dev)
> +{
> + int ret;
> +
> + 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);
> + if (test_bit(HASH_FLAGS_FINAL, &dev->hash_flags))
> + ret = 0;
> + else
> + ret = 2;
> + }
> +
> + 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 st_bits;
> int err;
>
> spin_lock_irqsave(&dev->lock, flags);
> @@ -456,6 +710,8 @@ 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 +723,29 @@ 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 */
> + 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 +758,8 @@ 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 +777,1133 @@ 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)
> + 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()

kernel-doc description needed.

> + * @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()

kernel-doc description needed.

> + * @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, flow);
> +
> + spin_unlock_irqrestore(&dev->lock, flags);
> +}
> +
> +/**
> + * s5p_ahash_dma_init -

kernel-doc description needed. Actually this appears in more places.

> + * @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

Please write this as proper sentence, wrapped at 80.

> + */
> +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_write_ctrl -

kernel-doc description needed.

> + * @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.

Weird, early wrapping of lines. Wrap at 80 unless you split paragraphs
on purpose.

> + *
> + * This function do not start DMA transfer.

s/do/does/

> + */
> +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 prelow, prehigh, low, high;
> + u32 configflags, swapflags;
> + 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;

No multiple assignments in one line.

> + /* 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);

No multiple assignments in one line.

> + }
> +
> + 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
> + *
> + * Update digcnt here, as it is needed for finup/final op.
> + */
> +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;
> +
> + 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);
> + 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
> + * @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.

Do not wrap lines too early.

> + *
> + * Set bit in dd->hash_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 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
> + * @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.

Do not wrap lins too early.

> + *
> + * 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 new_len)
> +{
> + int offset = ctx->skip;
> + int n = sg_nents(sg);
> + struct scatterlist *tmp;
> +
> + 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);
> +
> + 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

Do not wrap lins too early.

> + *
> + * 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, 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, BUFLEN)) {
> + 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, new_len);
> + else if (!list_ok)
> + return s5p_hash_copy_sg_lists(rctx, sg, 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);
> + bool final = rctx->flags & BIT(HASH_FLAGS_FINUP);
> + int xmit_len, hash_later, nbytes;
> + int ret;
> +
> + if (!req)
> + return 0;
> +
> + 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, BUFLEN))
> + xmit_len -= BUFLEN;
> + else
> + xmit_len -= xmit_len & (BUFLEN - 1);
> +
> + hash_later = rctx->total - xmit_len;
> + /* 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);
> + }
> +
> + if (xmit_len > BUFLEN) {
> + ret = s5p_hash_prepare_sgs(req->src, nbytes - hash_later,
> + final, rctx);
> + if (ret)
> + return ret;
> + } else {
> + /* have buffered data only */
> + if (unlikely(!rctx->bufcnt)) {
> + /* first update didn't fill up buffer */
> + 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_finish - copy calculated digest to crypto layer
> + * @req: AHASH request
> + *
> + * 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, "hash_finish digcnt: %lld\n", ctx->digcnt);
> +
> + return err;
> +}
> +
> +/**
> + * s5p_hash_finish_req - finish request
> + * @req: AHASH request
> + * @err: error
> + */
> +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;
> + unsigned long flags;
> +
> + 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);
> + }
> +
> + spin_lock_irqsave(&dd->hash_lock, flags);
> + dd->hash_flags &= ~(BIT(HASH_FLAGS_BUSY) | BIT(HASH_FLAGS_FINAL) |
> + BIT(HASH_FLAGS_DMA_READY) |
> + BIT(HASH_FLAGS_OUTPUT_READY));
> + spin_unlock_irqrestore(&dd->hash_lock, flags);
> +
> + 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 on dd->queue, if FLAGS_BUSY is not set on the
> + * device then processes the first request from the dd->queue
> + *
> + * 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 out;
> +
> + dev_dbg(dd->dev, "handling new req, op: %u, nbytes: %d\n",
> + ctx->op, req->nbytes);
> +
> + s5p_ahash_dma_init(dd, SSS_HASHIN_INDEPENDENT);
> + if (ctx->digcnt)
> + s5p_hash_write_iv(req); /* restore hash IV */
> +
> + if (ctx->op == HASH_OP_UPDATE) {
> + err = s5p_hash_xmit_dma(dd, ctx->total,
> + ctx->flags & BIT(HASH_FLAGS_FINUP));
> + if (err != -EINPROGRESS &&
> + (ctx->flags & BIT(HASH_FLAGS_FINUP)))
> + /* no final() after finup() */
> + err = s5p_hash_xmit_dma(dd, ctx->total, 1);
> + } else if (ctx->op == HASH_OP_FINAL) {
> + err = s5p_hash_xmit_dma(dd, ctx->total, 1);
> + }
> +out:
> + 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 (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:
> + /* 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
> + *
> + * 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 with 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
> + */
> +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
> + *
> + * Note: in final req->src do not have any data, and req->nbytes can be
> + * non-zero.
> + *
> + * 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

Do not wrap lines too early.

> + *
> + * 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.
> + */
> +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 (!ctx->digcnt && ctx->bufcnt < BUFLEN)
> + return s5p_hash_final_shash(req);
> +
> + 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
> + *
> + * 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

Do not wrap too early.

> + */
> + 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 s5p_hash_reqctx *ctx = ahash_request_ctx(req);
> + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
> + struct s5p_hash_ctx *tctx = crypto_ahash_ctx(tfm);
> + 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->engine = SSS_HASH_ENGINE_MD5;
> + ctx->nregs = HASH_MD5_MAX_REG;
> + break;
> + case SHA1_DIGEST_SIZE:
> + ctx->engine = SSS_HASH_ENGINE_SHA1;
> + ctx->nregs = HASH_SHA1_MAX_REG;
> + break;
> + case SHA256_DIGEST_SIZE:
> + 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;
> +
> + 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);
> + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
> + struct s5p_hash_ctx *tctx = crypto_ahash_ctx(tfm);
> + const struct s5p_hash_reqctx *ctx_in = in;
> +
> + memcpy(rctx, in, sizeof(*rctx) + BUFLEN);
> + if ((ctx_in->bufcnt < 0) || (ctx_in->bufcnt > BUFLEN)) {
> + set_bit(HASH_FLAGS_ERROR, &rctx->flags);
> + return -EINVAL;
> + }
> +
> + rctx->dd = tctx->dd;
> +
> + return 0;
> +}
> +
> +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,
> + }
> +}
> +
> +};
> +
> +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,
> + }
> +}
> +
> +};
> +
> +static struct sss_hash_algs_info exynos_hash_algs_info[] = {

You have warnings in your code. Please be sure that all compiler,
Smatch, Sparse, checkpatch and coccicheck warnings are fixed.

../drivers/crypto/s5p-sss.c:1896:34: warning: âexynos_hash_algs_infoâ defined but not used [-Wunused-variable]
static struct sss_hash_algs_info exynos_hash_algs_info[] = {

Probably this should be __maybe_unused.

Also this should be const. I do not understand why you have to add one
more static variable (which sticks the driver to only one instance...)
and then modify it during runtime. Everything should be stored in device
state container (s5p_aes_dev) - directly or through some other pointers.

> + {
> + .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)
> {
> @@ -826,9 +2218,12 @@ static int s5p_aes_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> int i, j, err = -ENODEV;
> + int hash_algs_size = 0;
> + struct sss_hash_algs_info *hash_algs_i;
> struct samsung_aes_variant *variant;
> struct s5p_aes_dev *pdata;
> struct resource *res;
> + int hash_i;
>
> if (s5p_dev)
> return -EEXIST;
> @@ -837,12 +2232,38 @@ static int s5p_aes_probe(struct platform_device *pdev)
> if (!pdata)
> return -ENOMEM;
>
> + variant = find_s5p_sss_version(pdev);
> 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);
> + /* Note: HASH and PRNG uses the same registers in secss,

Comment style.

> + * avoid overwrite each other. This will drop HASH when
> + * CONFIG_EXYNOS_RNG is enabled in config.
> + * We need larger size for HASH registers in secss, current
> + * describe only AES/DES
> + */
> + if (variant == &exynos_aes_data) {
> +#ifdef CONFIG_CRYPTO_DEV_EXYNOS_HASH

Use IS_ENABLED(), code is more readable then with ifdefs.

Best regards,
Krzysztof

Next message: Mario.Limonciello: "RE: [PATCH v3 0/8] Introduce support for Dell SMBIOS over WMI"
Previous message: Mario.Limonciello: "RE: [PATCH v3 5/8] platform/x86: dell-wmi-smbios: introduce character device for userspace"
In reply to: Kamil Konieczny: "[PATCH v3] crypto: s5p-sss: Add HASH support for Exynos"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]