1 files changed, 387 insertions, 0 deletions

diff --git a/drivers/crypto/ccree/cc_buffer_mgr.c b/drivers/crypto/ccree/cc_buffer_mgr.c
new file mode 100644
index 000000000000..4c6757966fd2
--- /dev/null
+++ b/drivers/crypto/ccree/cc_buffer_mgr.c
@@ -0,0 +1,387 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2012-2018 ARM Limited or its affiliates. */
+
+#include <crypto/authenc.h>
+#include <crypto/scatterwalk.h>
+#include <linux/dmapool.h>
+#include <linux/dma-mapping.h>
+
+#include "cc_buffer_mgr.h"
+#include "cc_lli_defs.h"
+
+enum dma_buffer_type {
+	DMA_NULL_TYPE = -1,
+	DMA_SGL_TYPE = 1,
+	DMA_BUFF_TYPE = 2,
+};
+
+struct buff_mgr_handle {
+	struct dma_pool *mlli_buffs_pool;
+};
+
+union buffer_array_entry {
+	struct scatterlist *sgl;
+	dma_addr_t buffer_dma;
+};
+
+struct buffer_array {
+	unsigned int num_of_buffers;
+	union buffer_array_entry entry[MAX_NUM_OF_BUFFERS_IN_MLLI];
+	unsigned int offset[MAX_NUM_OF_BUFFERS_IN_MLLI];
+	int nents[MAX_NUM_OF_BUFFERS_IN_MLLI];
+	int total_data_len[MAX_NUM_OF_BUFFERS_IN_MLLI];
+	enum dma_buffer_type type[MAX_NUM_OF_BUFFERS_IN_MLLI];
+	bool is_last[MAX_NUM_OF_BUFFERS_IN_MLLI];
+	u32 *mlli_nents[MAX_NUM_OF_BUFFERS_IN_MLLI];
+};
+
+static inline char *cc_dma_buf_type(enum cc_req_dma_buf_type type)
+{
+	switch (type) {
+	case CC_DMA_BUF_NULL:
+		return "BUF_NULL";
+	case CC_DMA_BUF_DLLI:
+		return "BUF_DLLI";
+	case CC_DMA_BUF_MLLI:
+		return "BUF_MLLI";
+	default:
+		return "BUF_INVALID";
+	}
+}
+
+/**
+ * cc_get_sgl_nents() - Get scatterlist number of entries.
+ *
+ * @sg_list: SG list
+ * @nbytes: [IN] Total SGL data bytes.
+ * @lbytes: [OUT] Returns the amount of bytes at the last entry
+ */
+static unsigned int cc_get_sgl_nents(struct device *dev,
+				     struct scatterlist *sg_list,
+				     unsigned int nbytes, u32 *lbytes,
+				     bool *is_chained)
+{
+	unsigned int nents = 0;
+
+	while (nbytes && sg_list) {
+		if (sg_list->length) {
+			nents++;
+			/* get the number of bytes in the last entry */
+			*lbytes = nbytes;
+			nbytes -= (sg_list->length > nbytes) ?
+					nbytes : sg_list->length;
+			sg_list = sg_next(sg_list);
+		} else {
+			sg_list = (struct scatterlist *)sg_page(sg_list);
+			if (is_chained)
+				*is_chained = true;
+		}
+	}
+	dev_dbg(dev, "nents %d last bytes %d\n", nents, *lbytes);
+	return nents;
+}
+
+/**
+ * cc_zero_sgl() - Zero scatter scatter list data.
+ *
+ * @sgl:
+ */
+void cc_zero_sgl(struct scatterlist *sgl, u32 data_len)
+{
+	struct scatterlist *current_sg = sgl;
+	int sg_index = 0;
+
+	while (sg_index <= data_len) {
+		if (!current_sg) {
+			/* reached the end of the sgl --> just return back */
+			return;
+		}
+		memset(sg_virt(current_sg), 0, current_sg->length);
+		sg_index += current_sg->length;
+		current_sg = sg_next(current_sg);
+	}
+}
+
+/**
+ * cc_copy_sg_portion() - Copy scatter list data,
+ * from to_skip to end, to dest and vice versa
+ *
+ * @dest:
+ * @sg:
+ * @to_skip:
+ * @end:
+ * @direct:
+ */
+void cc_copy_sg_portion(struct device *dev, u8 *dest, struct scatterlist *sg,
+			u32 to_skip, u32 end, enum cc_sg_cpy_direct direct)
+{
+	u32 nents, lbytes;
+
+	nents = cc_get_sgl_nents(dev, sg, end, &lbytes, NULL);
+	sg_copy_buffer(sg, nents, (void *)dest, (end - to_skip + 1), to_skip,
+		       (direct == CC_SG_TO_BUF));
+}
+
+static int cc_render_buff_to_mlli(struct device *dev, dma_addr_t buff_dma,
+				  u32 buff_size, u32 *curr_nents,
+				  u32 **mlli_entry_pp)
+{
+	u32 *mlli_entry_p = *mlli_entry_pp;
+	u32 new_nents;
+
+	/* Verify there is no memory overflow*/
+	new_nents = (*curr_nents + buff_size / CC_MAX_MLLI_ENTRY_SIZE + 1);
+	if (new_nents > MAX_NUM_OF_TOTAL_MLLI_ENTRIES)
+		return -ENOMEM;
+
+	/*handle buffer longer than 64 kbytes */
+	while (buff_size > CC_MAX_MLLI_ENTRY_SIZE) {
+		cc_lli_set_addr(mlli_entry_p, buff_dma);
+		cc_lli_set_size(mlli_entry_p, CC_MAX_MLLI_ENTRY_SIZE);
+		dev_dbg(dev, "entry[%d]: single_buff=0x%08X size=%08X\n",
+			*curr_nents, mlli_entry_p[LLI_WORD0_OFFSET],
+			mlli_entry_p[LLI_WORD1_OFFSET]);
+		buff_dma += CC_MAX_MLLI_ENTRY_SIZE;
+		buff_size -= CC_MAX_MLLI_ENTRY_SIZE;
+		mlli_entry_p = mlli_entry_p + 2;
+		(*curr_nents)++;
+	}
+	/*Last entry */
+	cc_lli_set_addr(mlli_entry_p, buff_dma);
+	cc_lli_set_size(mlli_entry_p, buff_size);
+	dev_dbg(dev, "entry[%d]: single_buff=0x%08X size=%08X\n",
+		*curr_nents, mlli_entry_p[LLI_WORD0_OFFSET],
+		mlli_entry_p[LLI_WORD1_OFFSET]);
+	mlli_entry_p = mlli_entry_p + 2;
+	*mlli_entry_pp = mlli_entry_p;
+	(*curr_nents)++;
+	return 0;
+}
+
+static int cc_render_sg_to_mlli(struct device *dev, struct scatterlist *sgl,
+				u32 sgl_data_len, u32 sgl_offset,
+				u32 *curr_nents, u32 **mlli_entry_pp)
+{
+	struct scatterlist *curr_sgl = sgl;
+	u32 *mlli_entry_p = *mlli_entry_pp;
+	s32 rc = 0;
+
+	for ( ; (curr_sgl && sgl_data_len);
+	      curr_sgl = sg_next(curr_sgl)) {
+		u32 entry_data_len =
+			(sgl_data_len > sg_dma_len(curr_sgl) - sgl_offset) ?
+				sg_dma_len(curr_sgl) - sgl_offset :
+				sgl_data_len;
+		sgl_data_len -= entry_data_len;
+		rc = cc_render_buff_to_mlli(dev, sg_dma_address(curr_sgl) +
+					    sgl_offset, entry_data_len,
+					    curr_nents, &mlli_entry_p);
+		if (rc)
+			return rc;
+
+		sgl_offset = 0;
+	}
+	*mlli_entry_pp = mlli_entry_p;
+	return 0;
+}
+
+static int cc_generate_mlli(struct device *dev, struct buffer_array *sg_data,
+			    struct mlli_params *mlli_params, gfp_t flags)
+{
+	u32 *mlli_p;
+	u32 total_nents = 0, prev_total_nents = 0;
+	int rc = 0, i;
+
+	dev_dbg(dev, "NUM of SG's = %d\n", sg_data->num_of_buffers);
+
+	/* Allocate memory from the pointed pool */
+	mlli_params->mlli_virt_addr =
+		dma_pool_alloc(mlli_params->curr_pool, flags,
+			       &mlli_params->mlli_dma_addr);
+	if (!mlli_params->mlli_virt_addr) {
+		dev_err(dev, "dma_pool_alloc() failed\n");
+		rc = -ENOMEM;
+		goto build_mlli_exit;
+	}
+	/* Point to start of MLLI */
+	mlli_p = (u32 *)mlli_params->mlli_virt_addr;
+	/* go over all SG's and link it to one MLLI table */
+	for (i = 0; i < sg_data->num_of_buffers; i++) {
+		union buffer_array_entry *entry = &sg_data->entry[i];
+		u32 tot_len = sg_data->total_data_len[i];
+		u32 offset = sg_data->offset[i];
+
+		if (sg_data->type[i] == DMA_SGL_TYPE)
+			rc = cc_render_sg_to_mlli(dev, entry->sgl, tot_len,
+						  offset, &total_nents,
+						  &mlli_p);
+		else /*DMA_BUFF_TYPE*/
+			rc = cc_render_buff_to_mlli(dev, entry->buffer_dma,
+						    tot_len, &total_nents,
+						    &mlli_p);
+		if (rc)
+			return rc;
+
+		/* set last bit in the current table */
+		if (sg_data->mlli_nents[i]) {
+			/*Calculate the current MLLI table length for the
+			 *length field in the descriptor
+			 */
+			*sg_data->mlli_nents[i] +=
+				(total_nents - prev_total_nents);
+			prev_total_nents = total_nents;
+		}
+	}
+
+	/* Set MLLI size for the bypass operation */
+	mlli_params->mlli_len = (total_nents * LLI_ENTRY_BYTE_SIZE);
+
+	dev_dbg(dev, "MLLI params: virt_addr=%pK dma_addr=%pad mlli_len=0x%X\n",
+		mlli_params->mlli_virt_addr, &mlli_params->mlli_dma_addr,
+		mlli_params->mlli_len);
+
+build_mlli_exit:
+	return rc;
+}
+
+static void cc_add_sg_entry(struct device *dev, struct buffer_array *sgl_data,
+			    unsigned int nents, struct scatterlist *sgl,
+			    unsigned int data_len, unsigned int data_offset,
+			    bool is_last_table, u32 *mlli_nents)
+{
+	unsigned int index = sgl_data->num_of_buffers;
+
+	dev_dbg(dev, "index=%u nents=%u sgl=%pK data_len=0x%08X is_last=%d\n",
+		index, nents, sgl, data_len, is_last_table);
+	sgl_data->nents[index] = nents;
+	sgl_data->entry[index].sgl = sgl;
+	sgl_data->offset[index] = data_offset;
+	sgl_data->total_data_len[index] = data_len;
+	sgl_data->type[index] = DMA_SGL_TYPE;
+	sgl_data->is_last[index] = is_last_table;
+	sgl_data->mlli_nents[index] = mlli_nents;
+	if (sgl_data->mlli_nents[index])
+		*sgl_data->mlli_nents[index] = 0;
+	sgl_data->num_of_buffers++;
+}
+
+static int cc_dma_map_sg(struct device *dev, struct scatterlist *sg, u32 nents,
+			 enum dma_data_direction direction)
+{
+	u32 i, j;
+	struct scatterlist *l_sg = sg;
+
+	for (i = 0; i < nents; i++) {
+		if (!l_sg)
+			break;
+		if (dma_map_sg(dev, l_sg, 1, direction) != 1) {
+			dev_err(dev, "dma_map_page() sg buffer failed\n");
+			goto err;
+		}
+		l_sg = sg_next(l_sg);
+	}
+	return nents;
+
+err:
+	/* Restore mapped parts */
+	for (j = 0; j < i; j++) {
+		if (!sg)
+			break;
+		dma_unmap_sg(dev, sg, 1, direction);
+		sg = sg_next(sg);
+	}
+	return 0;
+}
+
+static int cc_map_sg(struct device *dev, struct scatterlist *sg,
+		     unsigned int nbytes, int direction, u32 *nents,
+		     u32 max_sg_nents, u32 *lbytes, u32 *mapped_nents)
+{
+	bool is_chained = false;
+
+	if (sg_is_last(sg)) {
+		/* One entry only case -set to DLLI */
+		if (dma_map_sg(dev, sg, 1, direction) != 1) {
+			dev_err(dev, "dma_map_sg() single buffer failed\n");
+			return -ENOMEM;
+		}
+		dev_dbg(dev, "Mapped sg: dma_address=%pad page=%p addr=%pK offset=%u length=%u\n",
+			&sg_dma_address(sg), sg_page(sg), sg_virt(sg),
+			sg->offset, sg->length);
+		*lbytes = nbytes;
+		*nents = 1;
+		*mapped_nents = 1;
+	} else {  /*sg_is_last*/
+		*nents = cc_get_sgl_nents(dev, sg, nbytes, lbytes,
+					  &is_chained);
+		if (*nents > max_sg_nents) {
+			*nents = 0;
+			dev_err(dev, "Too many fragments. current %d max %d\n",
+				*nents, max_sg_nents);
+			return -ENOMEM;
+		}
+		if (!is_chained) {
+			/* In case of mmu the number of mapped nents might
+			 * be changed from the original sgl nents
+			 */
+			*mapped_nents = dma_map_sg(dev, sg, *nents, direction);
+			if (*mapped_nents == 0) {
+				*nents = 0;
+				dev_err(dev, "dma_map_sg() sg buffer failed\n");
+				return -ENOMEM;
+			}
+		} else {
+			/*In this case the driver maps entry by entry so it
+			 * must have the same nents before and after map
+			 */
+			*mapped_nents = cc_dma_map_sg(dev, sg, *nents,
+						      direction);
+			if (*mapped_nents != *nents) {
+				*nents = *mapped_nents;
+				dev_err(dev, "dma_map_sg() sg buffer failed\n");
+				return -ENOMEM;
+			}
+		}
+	}
+
+	return 0;
+}
+
+int cc_buffer_mgr_init(struct cc_drvdata *drvdata)
+{
+	struct buff_mgr_handle *buff_mgr_handle;
+	struct device *dev = drvdata_to_dev(drvdata);
+
+	buff_mgr_handle = kmalloc(sizeof(*buff_mgr_handle), GFP_KERNEL);
+	if (!buff_mgr_handle)
+		return -ENOMEM;
+
+	drvdata->buff_mgr_handle = buff_mgr_handle;
+
+	buff_mgr_handle->mlli_buffs_pool =
+		dma_pool_create("dx_single_mlli_tables", dev,
+				MAX_NUM_OF_TOTAL_MLLI_ENTRIES *
+				LLI_ENTRY_BYTE_SIZE,
+				MLLI_TABLE_MIN_ALIGNMENT, 0);
+
+	if (!buff_mgr_handle->mlli_buffs_pool)
+		goto error;
+
+	return 0;
+
+error:
+	cc_buffer_mgr_fini(drvdata);
+	return -ENOMEM;
+}
+
+int cc_buffer_mgr_fini(struct cc_drvdata *drvdata)
+{
+	struct buff_mgr_handle *buff_mgr_handle = drvdata->buff_mgr_handle;
+
+	if (buff_mgr_handle) {
+		dma_pool_destroy(buff_mgr_handle->mlli_buffs_pool);
+		kfree(drvdata->buff_mgr_handle);
+		drvdata->buff_mgr_handle = NULL;
+	}
+	return 0;
+}