crypto: octeontx2 - add ctx_val workaround

HW has a errata that CPT HW may hit an issue, while processing CPT
instructions with CTX_VAL set and CTX_VAL not set. So, this patch
adds the code to always set the CTX_VAL as a workaround.

Signed-off-by: Srujana Challa <schalla@marvell.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/marvell/octeontx2/cn10k_cpt.c

@@ -96,6 +96,76 @@ int cn10k_cptvf_lmtst_init(struct otx2_cptvf_dev *cptvf)
 }
 EXPORT_SYMBOL_NS_GPL(cn10k_cptvf_lmtst_init, CRYPTO_DEV_OCTEONTX2_CPT);
 
+void cn10k_cpt_hw_ctx_clear(struct pci_dev *pdev,
+			    struct cn10k_cpt_errata_ctx *er_ctx)
+{
+	u64 cptr_dma;
+
+	if (!is_dev_cn10ka_ax(pdev))
+		return;
+
+	cptr_dma = er_ctx->cptr_dma & ~(BIT_ULL(60));
+	cn10k_cpt_ctx_flush(pdev, cptr_dma, true);
+	dma_unmap_single(&pdev->dev, cptr_dma, CN10K_CPT_HW_CTX_SIZE,
+			 DMA_BIDIRECTIONAL);
+	kfree(er_ctx->hw_ctx);
+}
+EXPORT_SYMBOL_NS_GPL(cn10k_cpt_hw_ctx_clear, CRYPTO_DEV_OCTEONTX2_CPT);
+
+void cn10k_cpt_hw_ctx_set(union cn10k_cpt_hw_ctx *hctx, u16 ctx_sz)
+{
+	hctx->w0.aop_valid = 1;
+	hctx->w0.ctx_hdr_sz = 0;
+	hctx->w0.ctx_sz = ctx_sz;
+	hctx->w0.ctx_push_sz = 1;
+}
+EXPORT_SYMBOL_NS_GPL(cn10k_cpt_hw_ctx_set, CRYPTO_DEV_OCTEONTX2_CPT);
+
+int cn10k_cpt_hw_ctx_init(struct pci_dev *pdev,
+			  struct cn10k_cpt_errata_ctx *er_ctx)
+{
+	union cn10k_cpt_hw_ctx *hctx;
+	u64 cptr_dma;
+
+	er_ctx->cptr_dma = 0;
+	er_ctx->hw_ctx = NULL;
+
+	if (!is_dev_cn10ka_ax(pdev))
+		return 0;
+
+	hctx = kmalloc(CN10K_CPT_HW_CTX_SIZE, GFP_KERNEL);
+	if (unlikely(!hctx))
+		return -ENOMEM;
+	cptr_dma = dma_map_single(&pdev->dev, hctx, CN10K_CPT_HW_CTX_SIZE,
+				  DMA_BIDIRECTIONAL);
+
+	cn10k_cpt_hw_ctx_set(hctx, 1);
+	er_ctx->hw_ctx = hctx;
+	er_ctx->cptr_dma = cptr_dma | BIT_ULL(60);
+
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(cn10k_cpt_hw_ctx_init, CRYPTO_DEV_OCTEONTX2_CPT);
+
+void cn10k_cpt_ctx_flush(struct pci_dev *pdev, u64 cptr, bool inval)
+{
+	struct otx2_cptvf_dev *cptvf = pci_get_drvdata(pdev);
+	struct otx2_cptlfs_info *lfs = &cptvf->lfs;
+	u64 reg;
+
+	reg = (uintptr_t)cptr >> 7;
+	if (inval)
+		reg = reg | BIT_ULL(46);
+
+	otx2_cpt_write64(lfs->reg_base, lfs->blkaddr, lfs->lf[0].slot,
+			 OTX2_CPT_LF_CTX_FLUSH, reg);
+	/* Make sure that the FLUSH operation is complete */
+	wmb();
+	otx2_cpt_read64(lfs->reg_base, lfs->blkaddr, lfs->lf[0].slot,
+			OTX2_CPT_LF_CTX_ERR);
+}
+EXPORT_SYMBOL_NS_GPL(cn10k_cpt_ctx_flush, CRYPTO_DEV_OCTEONTX2_CPT);
+
 void cptvf_hw_ops_get(struct otx2_cptvf_dev *cptvf)
 {
 	if (test_bit(CN10K_LMTST, &cptvf->cap_flag))

drivers/crypto/marvell/octeontx2/cn10k_cpt.h

@@ -8,6 +8,26 @@
 #include "otx2_cptpf.h"
 #include "otx2_cptvf.h"
 
+#define CN10K_CPT_HW_CTX_SIZE  256
+
+union cn10k_cpt_hw_ctx {
+	u64 u;
+	struct {
+		u64 reserved_0_47:48;
+		u64 ctx_push_sz:7;
+		u64 reserved_55:1;
+		u64 ctx_hdr_sz:2;
+		u64 aop_valid:1;
+		u64 reserved_59:1;
+		u64 ctx_sz:4;
+	} w0;
+};
+
+struct cn10k_cpt_errata_ctx {
+	union cn10k_cpt_hw_ctx *hw_ctx;
+	u64 cptr_dma;
+};
+
 static inline u8 cn10k_cpt_get_compcode(union otx2_cpt_res_s *result)
 {
 	return ((struct cn10k_cpt_res_s *)result)->compcode;
@@ -30,6 +50,12 @@ static inline u8 otx2_cpt_get_uc_compcode(union otx2_cpt_res_s *result)
 
 int cn10k_cptpf_lmtst_init(struct otx2_cptpf_dev *cptpf);
 int cn10k_cptvf_lmtst_init(struct otx2_cptvf_dev *cptvf);
+void cn10k_cpt_ctx_flush(struct pci_dev *pdev, u64 cptr, bool inval);
+int cn10k_cpt_hw_ctx_init(struct pci_dev *pdev,
+			  struct cn10k_cpt_errata_ctx *er_ctx);
+void cn10k_cpt_hw_ctx_clear(struct pci_dev *pdev,
+			    struct cn10k_cpt_errata_ctx *er_ctx);
+void cn10k_cpt_hw_ctx_set(union cn10k_cpt_hw_ctx *hctx, u16 ctx_sz);
 void cptvf_hw_ops_get(struct otx2_cptvf_dev *cptvf);
 
 #endif /* __CN10K_CPTLF_H */

drivers/crypto/marvell/octeontx2/otx2_cpt_hw_types.h

@@ -102,6 +102,8 @@
 #define OTX2_CPT_LF_Q_INST_PTR          (0x110)
 #define OTX2_CPT_LF_Q_GRP_PTR           (0x120)
 #define OTX2_CPT_LF_NQX(a)              (0x400 | (a) << 3)
+#define OTX2_CPT_LF_CTX_FLUSH           (0x510)
+#define OTX2_CPT_LF_CTX_ERR             (0x520)
 #define OTX2_CPT_RVU_FUNC_BLKADDR_SHIFT 20
 /* LMT LF registers */
 #define OTX2_CPT_LMT_LFBASE             BIT_ULL(OTX2_CPT_RVU_FUNC_BLKADDR_SHIFT)

drivers/crypto/marvell/octeontx2/otx2_cpt_reqmgr.h

@@ -47,6 +47,8 @@ struct otx2_cptvf_request {
 	u32 param2;
 	u16 dlen;
 	union otx2_cpt_opcode opcode;
+	dma_addr_t cptr_dma;
+	void *cptr;
 };
 
 /*

drivers/crypto/marvell/octeontx2/otx2_cptvf_algs.c

@@ -17,6 +17,7 @@
 #include "otx2_cptvf.h"
 #include "otx2_cptvf_algs.h"
 #include "otx2_cpt_reqmgr.h"
+#include "cn10k_cpt.h"
 
 /* Size of salt in AES GCM mode */
 #define AES_GCM_SALT_SIZE 4
@@ -384,6 +385,9 @@ static inline int cpt_enc_dec(struct skcipher_request *req, u32 enc)
 	req_info->is_trunc_hmac = false;
 	req_info->ctrl.s.grp = otx2_cpt_get_kcrypto_eng_grp_num(pdev);
 
+	req_info->req.cptr = ctx->er_ctx.hw_ctx;
+	req_info->req.cptr_dma = ctx->er_ctx.cptr_dma;
+
 	/*
 	 * We perform an asynchronous send and once
 	 * the request is completed the driver would
@@ -530,6 +534,8 @@ static int otx2_cpt_enc_dec_init(struct crypto_skcipher *stfm)
 	struct otx2_cpt_enc_ctx *ctx = crypto_skcipher_ctx(stfm);
 	struct crypto_tfm *tfm = crypto_skcipher_tfm(stfm);
 	struct crypto_alg *alg = tfm->__crt_alg;
+	struct pci_dev *pdev;
+	int ret, cpu_num;
 
 	memset(ctx, 0, sizeof(*ctx));
 	/*
@@ -541,6 +547,15 @@ static int otx2_cpt_enc_dec_init(struct crypto_skcipher *stfm)
 		stfm, sizeof(struct otx2_cpt_req_ctx) +
 		      sizeof(struct skcipher_request));
 
+	ret = get_se_device(&pdev, &cpu_num);
+	if (ret)
+		return ret;
+
+	ctx->pdev = pdev;
+	ret = cn10k_cpt_hw_ctx_init(pdev, &ctx->er_ctx);
+	if (ret)
+		return ret;
+
 	return cpt_skcipher_fallback_init(ctx, alg);
 }
 
@@ -552,6 +567,7 @@ static void otx2_cpt_skcipher_exit(struct crypto_skcipher *tfm)
 		crypto_free_skcipher(ctx->fbk_cipher);
 		ctx->fbk_cipher = NULL;
 	}
+	cn10k_cpt_hw_ctx_clear(ctx->pdev, &ctx->er_ctx);
 }
 
 static int cpt_aead_fallback_init(struct otx2_cpt_aead_ctx *ctx,
@@ -576,6 +592,8 @@ static int cpt_aead_init(struct crypto_aead *atfm, u8 cipher_type, u8 mac_type)
 	struct otx2_cpt_aead_ctx *ctx = crypto_aead_ctx_dma(atfm);
 	struct crypto_tfm *tfm = crypto_aead_tfm(atfm);
 	struct crypto_alg *alg = tfm->__crt_alg;
+	struct pci_dev *pdev;
+	int ret, cpu_num;
 
 	ctx->cipher_type = cipher_type;
 	ctx->mac_type = mac_type;
@@ -632,6 +650,15 @@ static int cpt_aead_init(struct crypto_aead *atfm, u8 cipher_type, u8 mac_type)
 	}
 	crypto_aead_set_reqsize_dma(atfm, sizeof(struct otx2_cpt_req_ctx));
 
+	ret = get_se_device(&pdev, &cpu_num);
+	if (ret)
+		return ret;
+
+	ctx->pdev = pdev;
+	ret = cn10k_cpt_hw_ctx_init(pdev, &ctx->er_ctx);
+	if (ret)
+		return ret;
+
 	return cpt_aead_fallback_init(ctx, alg);
 }
 
@@ -694,6 +721,7 @@ static void otx2_cpt_aead_exit(struct crypto_aead *tfm)
 		crypto_free_aead(ctx->fbk_cipher);
 		ctx->fbk_cipher = NULL;
 	}
+	cn10k_cpt_hw_ctx_clear(ctx->pdev, &ctx->er_ctx);
 }
 
 static int otx2_cpt_aead_gcm_set_authsize(struct crypto_aead *tfm,
@@ -1299,6 +1327,9 @@ static int cpt_aead_enc_dec(struct aead_request *req, u8 reg_type, u8 enc)
 	req_info->is_enc = enc;
 	req_info->is_trunc_hmac = false;
 
+	req_info->req.cptr = ctx->er_ctx.hw_ctx;
+	req_info->req.cptr_dma = ctx->er_ctx.cptr_dma;
+
 	switch (reg_type) {
 	case OTX2_CPT_AEAD_ENC_DEC_REQ:
 		status = create_aead_input_list(req, enc);

drivers/crypto/marvell/octeontx2/otx2_cptvf_algs.h

@@ -9,6 +9,7 @@
 #include <crypto/skcipher.h>
 #include <crypto/aead.h>
 #include "otx2_cpt_common.h"
+#include "cn10k_cpt.h"
 
 #define OTX2_CPT_MAX_ENC_KEY_SIZE    32
 #define OTX2_CPT_MAX_HASH_KEY_SIZE   64
@@ -123,6 +124,8 @@ struct otx2_cpt_enc_ctx {
 	u8 key_type;
 	u8 enc_align_len;
 	struct crypto_skcipher *fbk_cipher;
+	struct pci_dev *pdev;
+	struct cn10k_cpt_errata_ctx er_ctx;
 };
 
 union otx2_cpt_offset_ctrl {
@@ -161,6 +164,8 @@ struct otx2_cpt_aead_ctx {
 	struct crypto_shash *hashalg;
 	struct otx2_cpt_sdesc *sdesc;
 	struct crypto_aead *fbk_cipher;
+	struct cn10k_cpt_errata_ctx er_ctx;
+	struct pci_dev *pdev;
 	u8 *ipad;
 	u8 *opad;
 	u32 enc_key_len;

drivers/crypto/marvell/octeontx2/otx2_cptvf_reqmgr.c

@@ -159,7 +159,7 @@ static int process_request(struct pci_dev *pdev, struct otx2_cpt_req_info *req,
 	cpu_to_be64s(&iq_cmd.cmd.u);
 	iq_cmd.dptr = info->dptr_baddr | info->gthr_sz << 60;
 	iq_cmd.rptr = info->rptr_baddr | info->sctr_sz << 60;
-	iq_cmd.cptr.u = 0;
+	iq_cmd.cptr.s.cptr = cpt_req->cptr_dma;
 	iq_cmd.cptr.s.grp = ctrl->s.grp;
 
 	/* Fill in the CPT_INST_S type command for HW interpretation */