[PATCH v2 05/16] crypto: qce - Add bam dma support for crypto register r/w

Md Sadre Alam
2024-08-15T08:57:57Z

Add BAM/DMA support for crypto register read/write.
With this change multiple crypto register will get
Written/Read using bam in one go.

Signed-off-by: Md Sadre Alam <quic_mdalam@quicinc.com>
---
Change in [v2]

* Addressed all the comments from v1

Change in [v1]

* Added initial support to read/write crypto
regitser via bam

drivers/crypto/qce/core.h | 9 ++
drivers/crypto/qce/dma.c | 227 ++++++++++++++++++++++++++++++++++++++
drivers/crypto/qce/dma.h | 24 +++-
3 files changed, 259 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/qce/core.h b/drivers/crypto/qce/core.h
index 25e2af45c047..bf28dedd1509 100644
--- a/drivers/crypto/qce/core.h
+++ b/drivers/crypto/qce/core.h
@@ -40,6 +40,8 @@ struct qce_device {
int burst_size;
unsigned int pipe_pair_id;
dma_addr_t base_dma;
+ __le32 *reg_read_buf;
+ dma_addr_t reg_buf_phys;
int (*async_req_enqueue)(struct qce_device *qce,
struct crypto_async_request *req);
void (*async_req_done)(struct qce_device *qce, int ret);
@@ -59,4 +61,11 @@ struct qce_algo_ops {
int (*async_req_handle)(struct crypto_async_request *async_req);
};

+int qce_write_reg_dma(struct qce_device *qce, unsigned int offset, u32 val,
+ int cnt);
+int qce_read_reg_dma(struct qce_device *qce, unsigned int offset, void *buff,
+ int cnt);
+void qce_clear_bam_transaction(struct qce_device *qce);
+int qce_submit_cmd_desc(struct qce_device *qce, unsigned long flags);
+struct qce_bam_transaction *qce_alloc_bam_txn(struct qce_dma_data *dma);
#endif /* _CORE_H_ */
diff --git a/drivers/crypto/qce/dma.c b/drivers/crypto/qce/dma.c
index 46db5bf366b4..e4e672d65302 100644
--- a/drivers/crypto/qce/dma.c
+++ b/drivers/crypto/qce/dma.c
@@ -4,12 +4,214 @@
*/

#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
#include <crypto/scatterwalk.h>

+#include "core.h"
#include "dma.h"

+#define QCE_REG_BUF_DMA_ADDR(qce, vaddr) \
+ ((qce)->reg_buf_phys + \
+ ((uint8_t *)(vaddr) - (uint8_t *)(qce)->reg_read_buf))
+
+void qce_clear_bam_transaction(struct qce_device *qce)
+{
+ struct qce_bam_transaction *qce_bam_txn = qce->dma.qce_bam_txn;
+
+ memset(&qce_bam_txn->qce_bam_ce_index, 0, sizeof(u32) * 8);
+}
+
+static int qce_dma_prep_cmd_sg(struct qce_device *qce, struct dma_chan *chan,
+ struct scatterlist *qce_bam_sgl,
+ int qce_sgl_cnt, unsigned long flags,
+ enum dma_transfer_direction dir_eng,
+ dma_async_tx_callback cb, void *cb_param)
+{
+ struct dma_async_tx_descriptor *dma_desc;
+ struct qce_desc_info *desc;
+ dma_cookie_t cookie;
+
+ desc = qce->dma.qce_bam_txn->qce_desc;
+
+ if (dir_eng == DMA_MEM_TO_DEV)
+ desc->dir = DMA_TO_DEVICE;
+ if (dir_eng == DMA_DEV_TO_MEM)
+ desc->dir = DMA_FROM_DEVICE;
+
+ if (!qce_bam_sgl || !qce_sgl_cnt)
+ return -EINVAL;
+
+ if (!dma_map_sg(qce->dev, qce_bam_sgl,
+ qce_sgl_cnt, desc->dir)) {
+ dev_err(qce->dev, "failure in mapping sgl for cmd desc\n");
+ return -ENOMEM;
+ }
+
+ dma_desc = dmaengine_prep_slave_sg(chan, qce_bam_sgl, qce_sgl_cnt,
+ dir_eng, flags);
+ if (!dma_desc) {
+ pr_err("%s:failure in prep cmd desc\n", __func__);
+ dma_unmap_sg(qce->dev, qce_bam_sgl, qce_sgl_cnt, desc->dir);
+ kfree(desc);
+ return -EINVAL;
+ }
+
+ desc->dma_desc = dma_desc;
+ desc->dma_desc->callback = cb;
+ desc->dma_desc->callback_param = cb_param;
+
+ cookie = dmaengine_submit(desc->dma_desc);
+
+ return dma_submit_error(cookie);
+}
+
+int qce_submit_cmd_desc(struct qce_device *qce, unsigned long flags)
+{
+ struct qce_bam_transaction *qce_bam_txn = qce->dma.qce_bam_txn;
+ struct dma_chan *chan = qce->dma.rxchan;
+ unsigned long desc_flags;
+ int ret = 0;
+
+ desc_flags = DMA_PREP_CMD;
+
+ /* For command descriptor always use consumer pipe
+ * it recomended as per HPG
+ */
+
+ if (qce_bam_txn->qce_read_sgl_cnt) {
+ ret = qce_dma_prep_cmd_sg(qce, chan, qce_bam_txn->qce_reg_read_sgl,
+ qce_bam_txn->qce_read_sgl_cnt,
+ desc_flags, DMA_DEV_TO_MEM,
+ NULL, NULL);
+ if (ret) {
+ pr_err("error while submiting cmd desc for rx\n");
+ return ret;
+ }
+ }
+
+ if (qce_bam_txn->qce_write_sgl_cnt) {
+ ret = qce_dma_prep_cmd_sg(qce, chan, qce_bam_txn->qce_reg_write_sgl,
+ qce_bam_txn->qce_write_sgl_cnt,
+ desc_flags, DMA_MEM_TO_DEV,
+ NULL, NULL);
+ }
+
+ if (ret) {
+ pr_err("error while submiting cmd desc for tx\n");
+ return ret;
+ }
+
+ qce_dma_issue_pending(&qce->dma);
+
+ if (qce_bam_txn->qce_read_sgl_cnt)
+ dma_unmap_sg(qce->dev, qce_bam_txn->qce_reg_read_sgl,
+ qce_bam_txn->qce_read_sgl_cnt,
+ DMA_FROM_DEVICE);
+ if (qce_bam_txn->qce_write_sgl_cnt)
+ dma_unmap_sg(qce->dev, qce_bam_txn->qce_reg_write_sgl,
+ qce_bam_txn->qce_write_sgl_cnt,
+ DMA_TO_DEVICE);
+
+ return ret;
+}
+
+static void qce_prep_dma_command_desc(struct qce_device *qce, struct qce_dma_data *dma,
+ bool read, unsigned int addr, void *buff, int size)
+{
+ struct qce_bam_transaction *qce_bam_txn = dma->qce_bam_txn;
+ struct bam_cmd_element *qce_bam_ce_buffer;
+ int qce_bam_ce_size, cnt, index;
+
+ index = qce_bam_txn->qce_bam_ce_index;
+ qce_bam_ce_buffer = &qce_bam_txn->qce_bam_ce[index];
+ if (read)
+ bam_prep_ce(qce_bam_ce_buffer, addr, BAM_READ_COMMAND,
+ QCE_REG_BUF_DMA_ADDR(qce,
+ (unsigned int *)buff));
+ else
+ bam_prep_ce_le32(qce_bam_ce_buffer, addr, BAM_WRITE_COMMAND,
+ *((__le32 *)buff));
+
+ if (read) {
+ cnt = qce_bam_txn->qce_read_sgl_cnt;
+ qce_bam_ce_buffer = &qce_bam_txn->qce_bam_ce
+ [qce_bam_txn->qce_pre_bam_ce_index];
+ qce_bam_txn->qce_bam_ce_index += size;
+ qce_bam_ce_size = (qce_bam_txn->qce_bam_ce_index -
+ qce_bam_txn->qce_pre_bam_ce_index) *
+ sizeof(struct bam_cmd_element);
+
+ sg_set_buf(&qce_bam_txn->qce_reg_read_sgl[cnt],
+ qce_bam_ce_buffer,
+ qce_bam_ce_size);
+
+ ++qce_bam_txn->qce_read_sgl_cnt;
+ qce_bam_txn->qce_pre_bam_ce_index =
+ qce_bam_txn->qce_bam_ce_index;
+ } else {
+ cnt = qce_bam_txn->qce_write_sgl_cnt;
+ qce_bam_ce_buffer = &qce_bam_txn->qce_bam_ce
+ [qce_bam_txn->qce_pre_bam_ce_index];
+ qce_bam_txn->qce_bam_ce_index += size;
+ qce_bam_ce_size = (qce_bam_txn->qce_bam_ce_index -
+ qce_bam_txn->qce_pre_bam_ce_index) *
+ sizeof(struct bam_cmd_element);
+
+ sg_set_buf(&qce_bam_txn->qce_reg_write_sgl[cnt],
+ qce_bam_ce_buffer,
+ qce_bam_ce_size);
+
+ ++qce_bam_txn->qce_write_sgl_cnt;
+ qce_bam_txn->qce_pre_bam_ce_index =
+ qce_bam_txn->qce_bam_ce_index;
+ }
+}
+
+int qce_write_reg_dma(struct qce_device *qce,
+ unsigned int offset, u32 val, int cnt)
+{
+ qce_prep_dma_command_desc(qce, &qce->dma, false, (qce->base_dma + offset),
+ &val, cnt);
+ return 0;
+}
+
+int qce_read_reg_dma(struct qce_device *qce,
+ unsigned int offset, void *buff, int cnt)
+{
+ qce_prep_dma_command_desc(qce, &qce->dma, true, (qce->base_dma + offset),
+ qce->reg_read_buf, cnt);
+ memcpy(buff, qce->reg_read_buf, 4);
+
+ return 0;
+}
+
+struct qce_bam_transaction *qce_alloc_bam_txn(struct qce_dma_data *dma)
+{
+ struct qce_bam_transaction *qce_bam_txn;
+
+ dma->qce_bam_txn = kmalloc(sizeof(*qce_bam_txn), GFP_KERNEL);
+ if (!dma->qce_bam_txn)
+ return NULL;
+
+ dma->qce_bam_txn->qce_desc = kzalloc(sizeof(*dma->qce_bam_txn->qce_desc),
+ GFP_KERNEL);
+ if (!dma->qce_bam_txn->qce_desc) {
+ kfree(dma->qce_bam_txn);
+ return NULL;
+ }
+
+ sg_init_table(dma->qce_bam_txn->qce_reg_write_sgl,
+ QCE_BAM_CMD_SGL_SIZE);
+
+ sg_init_table(dma->qce_bam_txn->qce_reg_read_sgl,
+ QCE_BAM_CMD_SGL_SIZE);
+
+ return dma->qce_bam_txn;
+}
+
int qce_dma_request(struct device *dev, struct qce_dma_data *dma)
{
+ struct qce_device *qce = container_of(dma, struct qce_device, dma);
int ret;

dma->txchan = dma_request_chan(dev, "tx");
@@ -31,7 +233,22 @@ int qce_dma_request(struct device *dev, struct qce_dma_data *dma)

dma->ignore_buf = dma->result_buf + QCE_RESULT_BUF_SZ;

+ dma->qce_bam_txn = qce_alloc_bam_txn(dma);
+ if (!dma->qce_bam_txn) {
+ pr_err("Failed to allocate bam transaction\n");
+ return -ENOMEM;
+ }
+
+ qce->reg_read_buf = dmam_alloc_coherent(qce->dev, QCE_MAX_REG_READ *
+ sizeof(*qce->reg_read_buf),
+ &qce->reg_buf_phys, GFP_KERNEL);
+ if (!qce->reg_read_buf) {
+ pr_err("Failed to allocate reg_read_buf\n");
+ return -ENOMEM;
+ }
+
return 0;
+
error_nomem:
dma_release_channel(dma->rxchan);
error_rx:
@@ -41,9 +258,19 @@ int qce_dma_request(struct device *dev, struct qce_dma_data *dma)

void qce_dma_release(struct qce_dma_data *dma)
{
+ struct qce_device *qce = container_of(dma,
+ struct qce_device, dma);
+
dma_release_channel(dma->txchan);
dma_release_channel(dma->rxchan);
kfree(dma->result_buf);
+ if (qce->reg_read_buf)
+ dmam_free_coherent(qce->dev, QCE_MAX_REG_READ *
+ sizeof(*qce->reg_read_buf),
+ qce->reg_read_buf,
+ qce->reg_buf_phys);
+ kfree(dma->qce_bam_txn->qce_desc);
+ kfree(dma->qce_bam_txn);
}

struct scatterlist *
diff --git a/drivers/crypto/qce/dma.h b/drivers/crypto/qce/dma.h
index 786402169360..f10991590b3f 100644
--- a/drivers/crypto/qce/dma.h
+++ b/drivers/crypto/qce/dma.h
@@ -7,6 +7,7 @@
#define _DMA_H_

#include <linux/dmaengine.h>
+#include <linux/dma/qcom_bam_dma.h>

/* maximum data transfer block size between BAM and CE */
#define QCE_BAM_BURST_SIZE 64
@@ -14,6 +15,10 @@
#define QCE_AUTHIV_REGS_CNT 16
#define QCE_AUTH_BYTECOUNT_REGS_CNT 4
#define QCE_CNTRIV_REGS_CNT 4
+#define QCE_BAM_CMD_SGL_SIZE 64
+#define QCE_BAM_CMD_ELEMENT_SIZE 64
+#define QCE_DMA_DESC_FLAG_BAM_NWD (0x0004)
+#define QCE_MAX_REG_READ 8

struct qce_result_dump {
u32 auth_iv[QCE_AUTHIV_REGS_CNT];
@@ -27,13 +32,30 @@ struct qce_result_dump {
#define QCE_RESULT_BUF_SZ \
ALIGN(sizeof(struct qce_result_dump), QCE_BAM_BURST_SIZE)

+struct qce_bam_transaction {
+ struct bam_cmd_element qce_bam_ce[QCE_BAM_CMD_ELEMENT_SIZE];
+ struct scatterlist qce_reg_write_sgl[QCE_BAM_CMD_SGL_SIZE];
+ struct scatterlist qce_reg_read_sgl[QCE_BAM_CMD_SGL_SIZE];
+ struct qce_desc_info *qce_desc;
+ u32 qce_bam_ce_index;
+ u32 qce_pre_bam_ce_index;
+ u32 qce_write_sgl_cnt;
+ u32 qce_read_sgl_cnt;
+};
+
struct qce_dma_data {
struct dma_chan *txchan;
struct dma_chan *rxchan;
struct qce_result_dump *result_buf;
+ struct qce_bam_transaction *qce_bam_txn;
void *ignore_buf;
};

+struct qce_desc_info {
+ struct dma_async_tx_descriptor *dma_desc;
+ enum dma_data_direction dir;
+};
+
int qce_dma_request(struct device *dev, struct qce_dma_data *dma);
void qce_dma_release(struct qce_dma_data *dma);
int qce_dma_prep_sgs(struct qce_dma_data *dma, struct scatterlist *sg_in,
@@ -44,5 +66,5 @@ int qce_dma_terminate_all(struct qce_dma_data *dma);
struct scatterlist *
qce_sgtable_add(struct sg_table *sgt, struct scatterlist *sg_add,
unsigned int max_len);
-
+void qce_dma_issue_cmd_desc_pending(struct qce_dma_data *dma, bool read);
#endif /* _DMA_H_ */
--
2.34.1