--- /dev/null
+/*
+ * Copyright (C) 2012-2017 ARM Limited or its affiliates.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/platform_device.h>
+#include <crypto/ctr.h>
+#include "ssi_config.h"
+#include "ssi_driver.h"
+#include "ssi_ivgen.h"
+#include "ssi_request_mgr.h"
+#include "ssi_sram_mgr.h"
+#include "ssi_buffer_mgr.h"
+
+/* The max. size of pool *MUST* be <= SRAM total size */
+#define SSI_IVPOOL_SIZE 1024
+/* The first 32B fraction of pool are dedicated to the
+ next encryption "key" & "IV" for pool regeneration */
+#define SSI_IVPOOL_META_SIZE (CC_AES_IV_SIZE + AES_KEYSIZE_128)
+#define SSI_IVPOOL_GEN_SEQ_LEN 4
+
+/**
+ * struct ssi_ivgen_ctx -IV pool generation context
+ * @pool: the start address of the iv-pool resides in internal RAM
+ * @ctr_key_dma: address of pool's encryption key material in internal RAM
+ * @ctr_iv_dma: address of pool's counter iv in internal RAM
+ * @next_iv_ofs: the offset to the next available IV in pool
+ * @pool_meta: virt. address of the initial enc. key/IV
+ * @pool_meta_dma: phys. address of the initial enc. key/IV
+ */
+struct ssi_ivgen_ctx {
+ ssi_sram_addr_t pool;
+ ssi_sram_addr_t ctr_key;
+ ssi_sram_addr_t ctr_iv;
+ uint32_t next_iv_ofs;
+ uint8_t *pool_meta;
+ dma_addr_t pool_meta_dma;
+};
+
+/*!
+ * Generates SSI_IVPOOL_SIZE of random bytes by
+ * encrypting 0's using AES128-CTR.
+ *
+ * \param ivgen iv-pool context
+ * \param iv_seq IN/OUT array to the descriptors sequence
+ * \param iv_seq_len IN/OUT pointer to the sequence length
+ */
+static int ssi_ivgen_generate_pool(
+ struct ssi_ivgen_ctx *ivgen_ctx,
+ HwDesc_s iv_seq[],
+ unsigned int *iv_seq_len)
+{
+ unsigned int idx = *iv_seq_len;
+
+ if ( (*iv_seq_len + SSI_IVPOOL_GEN_SEQ_LEN) > SSI_IVPOOL_SEQ_LEN) {
+ /* The sequence will be longer than allowed */
+ return -EINVAL;
+ }
+ /* Setup key */
+ HW_DESC_INIT(&iv_seq[idx]);
+ HW_DESC_SET_DIN_SRAM(&iv_seq[idx], ivgen_ctx->ctr_key, AES_KEYSIZE_128);
+ HW_DESC_SET_SETUP_MODE(&iv_seq[idx], SETUP_LOAD_KEY0);
+ HW_DESC_SET_CIPHER_CONFIG0(&iv_seq[idx], DESC_DIRECTION_ENCRYPT_ENCRYPT);
+ HW_DESC_SET_FLOW_MODE(&iv_seq[idx], S_DIN_to_AES);
+ HW_DESC_SET_KEY_SIZE_AES(&iv_seq[idx], CC_AES_128_BIT_KEY_SIZE);
+ HW_DESC_SET_CIPHER_MODE(&iv_seq[idx], DRV_CIPHER_CTR);
+ idx++;
+
+ /* Setup cipher state */
+ HW_DESC_INIT(&iv_seq[idx]);
+ HW_DESC_SET_DIN_SRAM(&iv_seq[idx], ivgen_ctx->ctr_iv, CC_AES_IV_SIZE);
+ HW_DESC_SET_CIPHER_CONFIG0(&iv_seq[idx], DESC_DIRECTION_ENCRYPT_ENCRYPT);
+ HW_DESC_SET_FLOW_MODE(&iv_seq[idx], S_DIN_to_AES);
+ HW_DESC_SET_SETUP_MODE(&iv_seq[idx], SETUP_LOAD_STATE1);
+ HW_DESC_SET_KEY_SIZE_AES(&iv_seq[idx], CC_AES_128_BIT_KEY_SIZE);
+ HW_DESC_SET_CIPHER_MODE(&iv_seq[idx], DRV_CIPHER_CTR);
+ idx++;
+
+ /* Perform dummy encrypt to skip first block */
+ HW_DESC_INIT(&iv_seq[idx]);
+ HW_DESC_SET_DIN_CONST(&iv_seq[idx], 0, CC_AES_IV_SIZE);
+ HW_DESC_SET_DOUT_SRAM(&iv_seq[idx], ivgen_ctx->pool, CC_AES_IV_SIZE);
+ HW_DESC_SET_FLOW_MODE(&iv_seq[idx], DIN_AES_DOUT);
+ idx++;
+
+ /* Generate IV pool */
+ HW_DESC_INIT(&iv_seq[idx]);
+ HW_DESC_SET_DIN_CONST(&iv_seq[idx], 0, SSI_IVPOOL_SIZE);
+ HW_DESC_SET_DOUT_SRAM(&iv_seq[idx], ivgen_ctx->pool, SSI_IVPOOL_SIZE);
+ HW_DESC_SET_FLOW_MODE(&iv_seq[idx], DIN_AES_DOUT);
+ idx++;
+
+ *iv_seq_len = idx; /* Update sequence length */
+
+ /* queue ordering assures pool readiness */
+ ivgen_ctx->next_iv_ofs = SSI_IVPOOL_META_SIZE;
+
+ return 0;
+}
+
+/*!
+ * Generates the initial pool in SRAM.
+ * This function should be invoked when resuming DX driver.
+ *
+ * \param drvdata
+ *
+ * \return int Zero for success, negative value otherwise.
+ */
+int ssi_ivgen_init_sram_pool(struct ssi_drvdata *drvdata)
+{
+ struct ssi_ivgen_ctx *ivgen_ctx = drvdata->ivgen_handle;
+ HwDesc_s iv_seq[SSI_IVPOOL_SEQ_LEN];
+ unsigned int iv_seq_len = 0;
+ int rc;
+
+ /* Generate initial enc. key/iv */
+ get_random_bytes(ivgen_ctx->pool_meta, SSI_IVPOOL_META_SIZE);
+
+ /* The first 32B reserved for the enc. Key/IV */
+ ivgen_ctx->ctr_key = ivgen_ctx->pool;
+ ivgen_ctx->ctr_iv = ivgen_ctx->pool + AES_KEYSIZE_128;
+
+ /* Copy initial enc. key and IV to SRAM at a single descriptor */
+ HW_DESC_INIT(&iv_seq[iv_seq_len]);
+ HW_DESC_SET_DIN_TYPE(&iv_seq[iv_seq_len], DMA_DLLI,
+ ivgen_ctx->pool_meta_dma, SSI_IVPOOL_META_SIZE,
+ NS_BIT);
+ HW_DESC_SET_DOUT_SRAM(&iv_seq[iv_seq_len], ivgen_ctx->pool,
+ SSI_IVPOOL_META_SIZE);
+ HW_DESC_SET_FLOW_MODE(&iv_seq[iv_seq_len], BYPASS);
+ iv_seq_len++;
+
+ /* Generate initial pool */
+ rc = ssi_ivgen_generate_pool(ivgen_ctx, iv_seq, &iv_seq_len);
+ if (unlikely(rc != 0)) {
+ return rc;
+ }
+ /* Fire-and-forget */
+ return send_request_init(drvdata, iv_seq, iv_seq_len);
+}
+
+/*!
+ * Free iv-pool and ivgen context.
+ *
+ * \param drvdata
+ */
+void ssi_ivgen_fini(struct ssi_drvdata *drvdata)
+{
+ struct ssi_ivgen_ctx *ivgen_ctx = drvdata->ivgen_handle;
+ struct device *device = &(drvdata->plat_dev->dev);
+
+ if (ivgen_ctx == NULL)
+ return;
+
+ if (ivgen_ctx->pool_meta != NULL) {
+ memset(ivgen_ctx->pool_meta, 0, SSI_IVPOOL_META_SIZE);
+ SSI_RESTORE_DMA_ADDR_TO_48BIT(ivgen_ctx->pool_meta_dma);
+ dma_free_coherent(device, SSI_IVPOOL_META_SIZE,
+ ivgen_ctx->pool_meta, ivgen_ctx->pool_meta_dma);
+ }
+
+ ivgen_ctx->pool = NULL_SRAM_ADDR;
+
+ /* release "this" context */
+ kfree(ivgen_ctx);
+}
+
+/*!
+ * Allocates iv-pool and maps resources.
+ * This function generates the first IV pool.
+ *
+ * \param drvdata Driver's private context
+ *
+ * \return int Zero for success, negative value otherwise.
+ */
+int ssi_ivgen_init(struct ssi_drvdata *drvdata)
+{
+ struct ssi_ivgen_ctx *ivgen_ctx;
+ struct device *device = &drvdata->plat_dev->dev;
+ int rc;
+
+ /* Allocate "this" context */
+ drvdata->ivgen_handle = kzalloc(sizeof(struct ssi_ivgen_ctx), GFP_KERNEL);
+ if (!drvdata->ivgen_handle) {
+ SSI_LOG_ERR("Not enough memory to allocate IVGEN context "
+ "(%zu B)\n", sizeof(struct ssi_ivgen_ctx));
+ rc = -ENOMEM;
+ goto out;
+ }
+ ivgen_ctx = drvdata->ivgen_handle;
+
+ /* Allocate pool's header for intial enc. key/IV */
+ ivgen_ctx->pool_meta = dma_alloc_coherent(device, SSI_IVPOOL_META_SIZE,
+ &ivgen_ctx->pool_meta_dma, GFP_KERNEL);
+ if (!ivgen_ctx->pool_meta) {
+ SSI_LOG_ERR("Not enough memory to allocate DMA of pool_meta "
+ "(%u B)\n", SSI_IVPOOL_META_SIZE);
+ rc = -ENOMEM;
+ goto out;
+ }
+ SSI_UPDATE_DMA_ADDR_TO_48BIT(ivgen_ctx->pool_meta_dma,
+ SSI_IVPOOL_META_SIZE);
+ /* Allocate IV pool in SRAM */
+ ivgen_ctx->pool = ssi_sram_mgr_alloc(drvdata, SSI_IVPOOL_SIZE);
+ if (ivgen_ctx->pool == NULL_SRAM_ADDR) {
+ SSI_LOG_ERR("SRAM pool exhausted\n");
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ return ssi_ivgen_init_sram_pool(drvdata);
+
+out:
+ ssi_ivgen_fini(drvdata);
+ return rc;
+}
+
+/*!
+ * Acquires 16 Bytes IV from the iv-pool
+ *
+ * \param drvdata Driver private context
+ * \param iv_out_dma Array of physical IV out addresses
+ * \param iv_out_dma_len Length of iv_out_dma array (additional elements of iv_out_dma array are ignore)
+ * \param iv_out_size May be 8 or 16 bytes long
+ * \param iv_seq IN/OUT array to the descriptors sequence
+ * \param iv_seq_len IN/OUT pointer to the sequence length
+ *
+ * \return int Zero for success, negative value otherwise.
+ */
+int ssi_ivgen_getiv(
+ struct ssi_drvdata *drvdata,
+ dma_addr_t iv_out_dma[],
+ unsigned int iv_out_dma_len,
+ unsigned int iv_out_size,
+ HwDesc_s iv_seq[],
+ unsigned int *iv_seq_len)
+{
+ struct ssi_ivgen_ctx *ivgen_ctx = drvdata->ivgen_handle;
+ unsigned int idx = *iv_seq_len;
+ unsigned int t;
+
+ if ((iv_out_size != CC_AES_IV_SIZE) &&
+ (iv_out_size != CTR_RFC3686_IV_SIZE)) {
+ return -EINVAL;
+ }
+ if ( (iv_out_dma_len + 1) > SSI_IVPOOL_SEQ_LEN) {
+ /* The sequence will be longer than allowed */
+ return -EINVAL;
+ }
+
+ //check that number of generated IV is limited to max dma address iv buffer size
+ if ( iv_out_dma_len > SSI_MAX_IVGEN_DMA_ADDRESSES) {
+ /* The sequence will be longer than allowed */
+ return -EINVAL;
+ }
+
+ for (t = 0; t < iv_out_dma_len; t++) {
+ /* Acquire IV from pool */
+ HW_DESC_INIT(&iv_seq[idx]);
+ HW_DESC_SET_DIN_SRAM(&iv_seq[idx],
+ ivgen_ctx->pool + ivgen_ctx->next_iv_ofs,
+ iv_out_size);
+ HW_DESC_SET_DOUT_DLLI(&iv_seq[idx], iv_out_dma[t],
+ iv_out_size, NS_BIT, 0);
+ HW_DESC_SET_FLOW_MODE(&iv_seq[idx], BYPASS);
+ idx++;
+ }
+
+ /* Bypass operation is proceeded by crypto sequence, hence must
+ * assure bypass-write-transaction by a memory barrier */
+ HW_DESC_INIT(&iv_seq[idx]);
+ HW_DESC_SET_DIN_NO_DMA(&iv_seq[idx], 0, 0xfffff0);
+ HW_DESC_SET_DOUT_NO_DMA(&iv_seq[idx], 0, 0, 1);
+ idx++;
+
+ *iv_seq_len = idx; /* update seq length */
+
+ /* Update iv index */
+ ivgen_ctx->next_iv_ofs += iv_out_size;
+
+ if ((SSI_IVPOOL_SIZE - ivgen_ctx->next_iv_ofs) < CC_AES_IV_SIZE) {
+ SSI_LOG_DEBUG("Pool exhausted, regenerating iv-pool\n");
+ /* pool is drained -regenerate it! */
+ return ssi_ivgen_generate_pool(ivgen_ctx, iv_seq, iv_seq_len);
+ }
+
+ return 0;
+}
+
+
--- /dev/null
+/*
+ * Copyright (C) 2012-2017 ARM Limited or its affiliates.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __SSI_IVGEN_H__
+#define __SSI_IVGEN_H__
+
+#include "cc_hw_queue_defs.h"
+
+
+#define SSI_IVPOOL_SEQ_LEN 8
+
+/*!
+ * Allocates iv-pool and maps resources.
+ * This function generates the first IV pool.
+ *
+ * \param drvdata Driver's private context
+ *
+ * \return int Zero for success, negative value otherwise.
+ */
+int ssi_ivgen_init(struct ssi_drvdata *drvdata);
+
+/*!
+ * Free iv-pool and ivgen context.
+ *
+ * \param drvdata
+ */
+void ssi_ivgen_fini(struct ssi_drvdata *drvdata);
+
+/*!
+ * Generates the initial pool in SRAM.
+ * This function should be invoked when resuming DX driver.
+ *
+ * \param drvdata
+ *
+ * \return int Zero for success, negative value otherwise.
+ */
+int ssi_ivgen_init_sram_pool(struct ssi_drvdata *drvdata);
+
+/*!
+ * Acquires 16 Bytes IV from the iv-pool
+ *
+ * \param drvdata Driver private context
+ * \param iv_out_dma Array of physical IV out addresses
+ * \param iv_out_dma_len Length of iv_out_dma array (additional elements of iv_out_dma array are ignore)
+ * \param iv_out_size May be 8 or 16 bytes long
+ * \param iv_seq IN/OUT array to the descriptors sequence
+ * \param iv_seq_len IN/OUT pointer to the sequence length
+ *
+ * \return int Zero for success, negative value otherwise.
+ */
+int ssi_ivgen_getiv(
+ struct ssi_drvdata *drvdata,
+ dma_addr_t iv_out_dma[],
+ unsigned int iv_out_dma_len,
+ unsigned int iv_out_size,
+ HwDesc_s iv_seq[],
+ unsigned int *iv_seq_len);
+
+#endif /*__SSI_IVGEN_H__*/
#include "ssi_buffer_mgr.h"
#include "ssi_request_mgr.h"
#include "ssi_sysfs.h"
+#include "ssi_ivgen.h"
#include "ssi_pm.h"
#define SSI_MAX_POLL_ITER 10
void __iomem *cc_base = drvdata->cc_base;
struct ssi_request_mgr_handle *req_mgr_h = drvdata->request_mgr_handle;
unsigned int used_sw_slots;
+ unsigned int iv_seq_len = 0;
unsigned int total_seq_len = len; /*initial sequence length*/
+ HwDesc_s iv_seq[SSI_IVPOOL_SEQ_LEN];
int rc;
- unsigned int max_required_seq_len = total_seq_len + ((is_dout == 0) ? 1 : 0);
+ unsigned int max_required_seq_len = (total_seq_len +
+ ((ssi_req->ivgen_dma_addr_len == 0) ? 0 :
+ SSI_IVPOOL_SEQ_LEN ) +
+ ((is_dout == 0 )? 1 : 0));
DECL_CYCLE_COUNT_RESOURCES;
#if defined (CONFIG_PM_RUNTIME) || defined (CONFIG_PM_SLEEP)
total_seq_len++;
}
+ if (ssi_req->ivgen_dma_addr_len > 0) {
+ SSI_LOG_DEBUG("Acquire IV from pool into %d DMA addresses 0x%llX, 0x%llX, 0x%llX, IV-size=%u\n",
+ ssi_req->ivgen_dma_addr_len,
+ (unsigned long long)ssi_req->ivgen_dma_addr[0],
+ (unsigned long long)ssi_req->ivgen_dma_addr[1],
+ (unsigned long long)ssi_req->ivgen_dma_addr[2],
+ ssi_req->ivgen_size);
+
+ /* Acquire IV from pool */
+ rc = ssi_ivgen_getiv(drvdata, ssi_req->ivgen_dma_addr, ssi_req->ivgen_dma_addr_len,
+ ssi_req->ivgen_size, iv_seq, &iv_seq_len);
+
+ if (unlikely(rc != 0)) {
+ SSI_LOG_ERR("Failed to generate IV (rc=%d)\n", rc);
+ spin_unlock_bh(&req_mgr_h->hw_lock);
+#if defined (CONFIG_PM_RUNTIME) || defined (CONFIG_PM_SLEEP)
+ ssi_power_mgr_runtime_put_suspend(&drvdata->plat_dev->dev);
+#endif
+ return rc;
+ }
+
+ total_seq_len += iv_seq_len;
+ }
+
used_sw_slots = ((req_mgr_h->req_queue_head - req_mgr_h->req_queue_tail) & (MAX_REQUEST_QUEUE_SIZE-1));
if (unlikely(used_sw_slots > req_mgr_h->max_used_sw_slots)) {
req_mgr_h->max_used_sw_slots = used_sw_slots;
/* STAT_PHASE_4: Push sequence */
START_CYCLE_COUNT();
+ enqueue_seq(cc_base, iv_seq, iv_seq_len);
enqueue_seq(cc_base, desc, len);
enqueue_seq(cc_base, &req_mgr_h->compl_desc, (is_dout ? 0 : 1));
END_CYCLE_COUNT(ssi_req->op_type, STAT_PHASE_4);
projects / linux-2.6-microblaze.git / commitdiff