From: Michael Walle michael@walle.cc
stable inclusion from stable-5.10.80 commit 03725f7125db81c45544f29dd66d313f4a52f8cd bugzilla: 185821 https://gitee.com/openeuler/kernel/issues/I4L7CG
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit f20311cc9c58052e0b215013046cbf390937910c ]
On newer CAAM versions, not all accelerators are disabled if the SoC is a non-E variant. While the driver checks most of the modules for availability, there is one - PKHA - which sticks out. On non-E variants it is still reported as available, that is the number of instances is non-zero, but it has limited functionality. In particular it doesn't support encryption and decryption, but just signing and verifying. This is indicated by a bit in the PKHA_MISC field. Take this bit into account if we are checking for availability.
This will the following error: [ 8.167817] caam_jr 8020000.jr: 20000b0f: CCB: desc idx 11: : Invalid CHA selected.
Tested on an NXP LS1028A (non-E) SoC.
Fixes: d239b10d4ceb ("crypto: caam - add register map changes cf. Era 10") Signed-off-by: Michael Walle michael@walle.cc Reviewed-by: Horia Geantă horia.geanta@nxp.com Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Chen Jun chenjun102@huawei.com Reviewed-by: Weilong Chen chenweilong@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com
Signed-off-by: Chen Jun chenjun102@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/crypto/caam/caampkc.c | 19 +++++++++++++++---- drivers/crypto/caam/regs.h | 3 +++ 2 files changed, 18 insertions(+), 4 deletions(-)
diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c index dd5f101e43f8..3acc825da4cc 100644 --- a/drivers/crypto/caam/caampkc.c +++ b/drivers/crypto/caam/caampkc.c @@ -1152,16 +1152,27 @@ static struct caam_akcipher_alg caam_rsa = { int caam_pkc_init(struct device *ctrldev) { struct caam_drv_private *priv = dev_get_drvdata(ctrldev); - u32 pk_inst; + u32 pk_inst, pkha; int err; init_done = false;
/* Determine public key hardware accelerator presence. */ - if (priv->era < 10) + if (priv->era < 10) { pk_inst = (rd_reg32(&priv->ctrl->perfmon.cha_num_ls) & CHA_ID_LS_PK_MASK) >> CHA_ID_LS_PK_SHIFT; - else - pk_inst = rd_reg32(&priv->ctrl->vreg.pkha) & CHA_VER_NUM_MASK; + } else { + pkha = rd_reg32(&priv->ctrl->vreg.pkha); + pk_inst = pkha & CHA_VER_NUM_MASK; + + /* + * Newer CAAMs support partially disabled functionality. If this is the + * case, the number is non-zero, but this bit is set to indicate that + * no encryption or decryption is supported. Only signing and verifying + * is supported. + */ + if (pkha & CHA_VER_MISC_PKHA_NO_CRYPT) + pk_inst = 0; + }
/* Do not register algorithms if PKHA is not present. */ if (!pk_inst) diff --git a/drivers/crypto/caam/regs.h b/drivers/crypto/caam/regs.h index af61f3a2c0d4..3738625c0250 100644 --- a/drivers/crypto/caam/regs.h +++ b/drivers/crypto/caam/regs.h @@ -322,6 +322,9 @@ struct version_regs { /* CHA Miscellaneous Information - AESA_MISC specific */ #define CHA_VER_MISC_AES_GCM BIT(1 + CHA_VER_MISC_SHIFT)
+/* CHA Miscellaneous Information - PKHA_MISC specific */ +#define CHA_VER_MISC_PKHA_NO_CRYPT BIT(7 + CHA_VER_MISC_SHIFT) + /* * caam_perfmon - Performance Monitor/Secure Memory Status/ * CAAM Global Status/Component Version IDs