[PATCH] crypto: fsl_hash: fix flush dcache alignment in caam_hash()

[Benjamin Lemouzy]

Hi Peng,

On Fri, 28 Feb 2025 12:17:56 +0800
Peng Fan <peng.fan at oss.nxp.com> wrote:

> Hi Benjamin,
> 
> On Fri, Feb 21, 2025 at 08:05:01AM +0100, blemouzy.ml at gmail.com wrote:
> >From: Benjamin Lemouzy <blemouzy at centralp.fr>
> >
> >Loading a FIT kernel image with hash hardware acceleration enabled
> >(CONFIG_SHA_HW_ACCEL=y) displays the following CACHE warning:  
> 
> Sorry for my lazyness, the following patch should be able to solve
> your issue. I will prepare a PR soon.
> https://patchwork.ozlabs.org/project/uboot/patch/1bd862e53b50825f6030bf9f212127c776fff881.camel@googlemail.com/

I just tested the suggested patch and it's not working:

	## Loading kernel from FIT Image at 16000000 ...
	   Using 'conf-imx6q-xxx.dtb' configuration
	   Trying 'kernel-1' kernel subimage
		 Description:  Linux kernel
		 Type:         Kernel Image
		 Compression:  uncompressed
		 Data Start:   0x16000128
		 Data Size:    7600544 Bytes = 7.2 MiB
		 Architecture: ARM
		 OS:           Linux
		 Load Address: 0x10008000
		 Entry Point:  0x10008000
		 Hash algo:    sha256
		 Hash value:   a664f6c4d4ac97e2d867b8ee4f38cf934a48f99c65f19f824162b7ca077cb0d9
	   Verifying Hash Integrity ... sha256+ OK
	## Loading ramdisk from FIT Image at 16000000 ...
	   Using 'conf-imx6q-xxx.dtb' configuration
	   Trying 'ramdisk-1' ramdisk subimage
		 Description:  ctp-image-base-initramfs
		 Type:         RAMDisk Image
		 Compression:  uncompressed
		 Data Start:   0x1676d6d4
		 Data Size:    12635898 Bytes = 12.1 MiB
		 Architecture: ARM
		 OS:           Linux
		 Load Address: 0x13000000
		 Entry Point:  unavailable
		 Hash algo:    sha256
		 Hash value:   e1fe9087261f33679b95cd82b387317fa31b58f6365406fad1df1f27d46923e9
	   Verifying Hash Integrity ... sha256CAAM was not setup properly or it is faulty
	 error!
	Bad hash value for 'hash-1' hash node in 'ramdisk-1' image node
	Bad Data Hash
	Ramdisk image is corrupt or invalid

Benjamin

> Thanks,
> Peng
> >
> >    [...]
> >    Trying 'kernel-1' kernel subimage
> >    [...]
> >    Verifying Hash Integrity ... sha256CACHE: Misaligned operation at
> >range [16000128, 1673fae8]
> >    [...]
> >    Trying 'ramdisk-1' ramdisk subimage
> >    [...]
> >    Verifying Hash Integrity ... sha256CACHE: Misaligned operation at
> >range [1676d6d4, 1737a5d4]
> >    [...]
> >    Trying 'fdt-imx6q-xxx.dtb' fdt subimage
> >    [...]
> >    Verifying Hash Integrity ... sha256CACHE: Misaligned operation at
> >range [1673fbdc, 1674b0dc]
> >    [...]
> >
> >This patch fixes it.
> >
> >Tested on:
> >- i.MX 6 custom board
> >- LS1021A custom board
> >
> >Signed-off-by: Benjamin Lemouzy <blemouzy at centralp.fr>
> >---
> > drivers/crypto/fsl/fsl_hash.c | 6 ++++--
> > 1 file changed, 4 insertions(+), 2 deletions(-)
> >
> >diff --git a/drivers/crypto/fsl/fsl_hash.c
> >b/drivers/crypto/fsl/fsl_hash.c index 79b32e2627..b721c86609 100644
> >--- a/drivers/crypto/fsl/fsl_hash.c
> >+++ b/drivers/crypto/fsl/fsl_hash.c
> >@@ -183,6 +183,7 @@ int caam_hash(const unsigned char *pbuf,
> >unsigned int buf_len,
> > {
> > 	int ret = 0;
> > 	uint32_t *desc;
> >+	unsigned long pbuf_aligned;
> > 	unsigned int size;
> > 
> > 	desc = malloc_cache_aligned(sizeof(int) *
> > MAX_CAAM_DESCSIZE);
> >@@ -191,8 +192,9 @@ int caam_hash(const unsigned char *pbuf,
> >unsigned int buf_len,
> > 		return -ENOMEM;
> > 	}
> > 
> >-	size = ALIGN(buf_len, ARCH_DMA_MINALIGN);
> >-	flush_dcache_range((unsigned long)pbuf, (unsigned long)pbuf
> >+ size);
> >+	pbuf_aligned = ALIGN_DOWN((unsigned long)pbuf,
> >ARCH_DMA_MINALIGN);
> >+	size = ALIGN(buf_len + ((unsigned long)pbuf -
> >pbuf_aligned), ARCH_DMA_MINALIGN);
> >+	flush_dcache_range(pbuf_aligned, pbuf_aligned + size);
> > 
> > 	inline_cnstr_jobdesc_hash(desc, pbuf, buf_len, pout,
> > 				  driver_hash[algo].alg_type,
> >-- 
> >2.43.0
> >