On 1/7/21 11:58 PM, James Smart wrote:
This patch continues the efct driver population.
This patch adds driver definitions for:
RQ data buffer allocation and deallocate.
Memory pool allocation and deallocation APIs.
Mailbox command submission and completion routines.
Co-developed-by: Ram Vegesna <ram.vegesna@xxxxxxxxxxxx>
Signed-off-by: Ram Vegesna <ram.vegesna@xxxxxxxxxxxx>
Signed-off-by: James Smart <jsmart2021@xxxxxxxxx>
---
v7:
Ensure an EFC_XXX status value is returned (not numerical constants)
Style: break declaration assignment into declaration and later value
assignment.
---
drivers/scsi/elx/efct/efct_hw.c | 406 ++++++++++++++++++++++++++++++++
drivers/scsi/elx/efct/efct_hw.h | 9 +
2 files changed, 415 insertions(+)
diff --git a/drivers/scsi/elx/efct/efct_hw.c b/drivers/scsi/elx/efct/efct_hw.c
index 2c15468bae4b..451a5729bff4 100644
--- a/drivers/scsi/elx/efct/efct_hw.c
+++ b/drivers/scsi/elx/efct/efct_hw.c
@@ -1159,3 +1159,409 @@ efct_get_wwpn(struct efct_hw *hw)
memcpy(p, sli->wwpn, sizeof(p));
return get_unaligned_be64(p);
}
+
+static struct efc_hw_rq_buffer *
+efct_hw_rx_buffer_alloc(struct efct_hw *hw, u32 rqindex, u32 count,
+ u32 size)
+{
+ struct efct *efct = hw->os;
+ struct efc_hw_rq_buffer *rq_buf = NULL;
+ struct efc_hw_rq_buffer *prq;
+ u32 i;
+
+ if (!count)
+ return NULL;
+
+ rq_buf = kmalloc_array(count, sizeof(*rq_buf), GFP_KERNEL);
+ if (!rq_buf)
+ return NULL;
+ memset(rq_buf, 0, sizeof(*rq_buf) * count);
+
+ for (i = 0, prq = rq_buf; i < count; i ++, prq++) {
+ prq->rqindex = rqindex;
+ prq->dma.size = size;
+ prq->dma.virt = dma_alloc_coherent(&efct->pci->dev,
+ prq->dma.size,
+ &prq->dma.phys,
+ GFP_DMA);
+ if (!prq->dma.virt) {
+ efc_log_err(hw->os, "DMA allocation failed\n");
+ kfree(rq_buf);
+ return NULL;
+ }
+ }
+ return rq_buf;
+}
+
+static void
+efct_hw_rx_buffer_free(struct efct_hw *hw,
+ struct efc_hw_rq_buffer *rq_buf,
+ u32 count)
+{
+ struct efct *efct = hw->os;
+ u32 i;
+ struct efc_hw_rq_buffer *prq;
+
+ if (rq_buf) {
+ for (i = 0, prq = rq_buf; i < count; i++, prq++) {
+ dma_free_coherent(&efct->pci->dev,
+ prq->dma.size, prq->dma.virt,
+ prq->dma.phys);
+ memset(&prq->dma, 0, sizeof(struct efc_dma));
+ }
+
+ kfree(rq_buf);
+ }
+}
+
+enum efct_hw_rtn
+efct_hw_rx_allocate(struct efct_hw *hw)
+{
+ struct efct *efct = hw->os;
+ u32 i;
+ enum efct_hw_rtn rc = EFCT_HW_RTN_SUCCESS;
+ u32 rqindex = 0;
+ u32 hdr_size = EFCT_HW_RQ_SIZE_HDR;
+ u32 payload_size = hw->config.rq_default_buffer_size;
+
+ rqindex = 0;
+
+ for (i = 0; i < hw->hw_rq_count; i++) {
+ struct hw_rq *rq = hw->hw_rq[i];
+
+ /* Allocate header buffers */
+ rq->hdr_buf = efct_hw_rx_buffer_alloc(hw, rqindex,
+ rq->entry_count,
+ hdr_size);
+ if (!rq->hdr_buf) {
+ efc_log_err(efct,
+ "efct_hw_rx_buffer_alloc hdr_buf failed\n");
+ rc = EFCT_HW_RTN_ERROR;
+ break;
+ }
+
+ efc_log_debug(hw->os,
+ "rq[%2d] rq_id %02d header %4d by %4d bytes\n",
+ i, rq->hdr->id, rq->entry_count, hdr_size);
+
+ rqindex++;
+
+ /* Allocate payload buffers */
+ rq->payload_buf = efct_hw_rx_buffer_alloc(hw, rqindex,
+ rq->entry_count,
+ payload_size);
+ if (!rq->payload_buf) {
+ efc_log_err(efct,
+ "efct_hw_rx_buffer_alloc fb_buf failed\n");
+ rc = EFCT_HW_RTN_ERROR;
+ break;
+ }
+ efc_log_debug(hw->os,
+ "rq[%2d] rq_id %02d default %4d by %4d bytes\n",
+ i, rq->data->id, rq->entry_count, payload_size);
+ rqindex++;
+ }
+
+ return rc ? EFCT_HW_RTN_ERROR : EFCT_HW_RTN_SUCCESS;
+}
+
+enum efct_hw_rtn
+efct_hw_rx_post(struct efct_hw *hw)
+{
+ u32 i;
+ u32 idx;
+ u32 rq_idx;
+ enum efct_hw_rtn rc = EFCT_HW_RTN_SUCCESS;
+
+ if (!hw->seq_pool) {
+ u32 count = 0;
+
+ for (i = 0; i < hw->hw_rq_count; i++)
+ count += hw->hw_rq[i]->entry_count;
+
+ hw->seq_pool = kmalloc_array(count,
+ sizeof(struct efc_hw_sequence), GFP_KERNEL);
+ if (!hw->seq_pool)
+ return EFCT_HW_RTN_NO_MEMORY;
+ }
+
+ /*
+ * In RQ pair mode, we MUST post the header and payload buffer at the
+ * same time.
+ */
+ for (rq_idx = 0, idx = 0; rq_idx < hw->hw_rq_count; rq_idx++) {
+ struct hw_rq *rq = hw->hw_rq[rq_idx];
+
+ for (i = 0; i < rq->entry_count - 1; i++) {
+ struct efc_hw_sequence *seq;
+
+ seq = hw->seq_pool + idx;
+ idx++;
+ seq->header = &rq->hdr_buf[i];
+ seq->payload = &rq->payload_buf[i];
+ rc = efct_hw_sequence_free(hw, seq);
+ if (rc)
+ break;
+ }
+ if (rc)
+ break;
+ }
+
+ if (rc && hw->seq_pool)
+ kfree(hw->seq_pool);
+
+ return rc;
+}
+
+void
+efct_hw_rx_free(struct efct_hw *hw)
+{
+ u32 i;
+
+ /* Free hw_rq buffers */
+ for (i = 0; i < hw->hw_rq_count; i++) {
+ struct hw_rq *rq = hw->hw_rq[i];
+
+ if (rq) {
+ efct_hw_rx_buffer_free(hw, rq->hdr_buf,
+ rq->entry_count);
+ rq->hdr_buf = NULL;
+ efct_hw_rx_buffer_free(hw, rq->payload_buf,
+ rq->entry_count);
+ rq->payload_buf = NULL;
+ }
+ }
+}
+
+static int
+efct_hw_cmd_submit_pending(struct efct_hw *hw)
+{
+ int rc = EFC_SUCCESS;
+
+ /* Assumes lock held */
+
+ /* Only submit MQE if there's room */
+ while (hw->cmd_head_count < (EFCT_HW_MQ_DEPTH - 1) &&
+ !list_empty(&hw->cmd_pending)) {
+ struct efct_command_ctx *ctx;
+
+ ctx = list_first_entry(&hw->cmd_pending,
+ struct efct_command_ctx, list_entry);
+ if (!ctx)
+ break;
+
+ list_del_init(&ctx->list_entry);
+
+ list_add_tail(&ctx->list_entry, &hw->cmd_head);
+ hw->cmd_head_count++;
+ if (sli_mq_write(&hw->sli, hw->mq, ctx->buf) < 0) {
+ efc_log_debug(hw->os,
+ "sli_queue_write failed: %d\n", rc);
+ rc = EFC_FAIL;
+ break;
+ }
+ }
+ return rc;
+}
+
+enum efct_hw_rtn
+efct_hw_command(struct efct_hw *hw, u8 *cmd, u32 opts, void *cb, void *arg)
+{
+ enum efct_hw_rtn rc = EFCT_HW_RTN_ERROR;
+ unsigned long flags = 0;
+ void *bmbx = NULL;
+
+ /*
+ * If the chip is in an error state (UE'd) then reject this mailbox
+ * command.
+ */
+ if (sli_fw_error_status(&hw->sli) > 0) {
+ efc_log_crit(hw->os,
+ "Chip is in an error state - reset needed\n");
+ efc_log_crit(hw->os,
+ "status=%#x error1=%#x error2=%#x\n",
+ sli_reg_read_status(&hw->sli),
+ sli_reg_read_err1(&hw->sli),
+ sli_reg_read_err2(&hw->sli));
+
+ return EFCT_HW_RTN_ERROR;
+ }
+
If there is an reset needed, why don't you do so?
+ /*
+ * Send a mailbox command to the hardware, and either wait for
+ * a completion (EFCT_CMD_POLL) or get an optional asynchronous
+ * completion (EFCT_CMD_NOWAIT).
+ */
+
+ if (opts == EFCT_CMD_POLL) {
+ mutex_lock(&hw->bmbx_lock);
+ bmbx = hw->sli.bmbx.virt;
+
+ memset(bmbx, 0, SLI4_BMBX_SIZE);
+ memcpy(bmbx, cmd, SLI4_BMBX_SIZE);
+
+ if (sli_bmbx_command(&hw->sli) == 0) {
+ rc = EFCT_HW_RTN_SUCCESS;
+ memcpy(cmd, bmbx, SLI4_BMBX_SIZE);
+ }
+ mutex_unlock(&hw->bmbx_lock);
+ } else if (opts == EFCT_CMD_NOWAIT) {
+ struct efct_command_ctx *ctx = NULL;
+
+ if (hw->state != EFCT_HW_STATE_ACTIVE) {
+ efc_log_err(hw->os,
+ "Can't send command, HW state=%d\n",
+ hw->state);
+ return EFCT_HW_RTN_ERROR;
+ }
+
+ ctx = mempool_alloc(hw->cmd_ctx_pool, GFP_ATOMIC);
+ if (!ctx)
+ return EFCT_HW_RTN_NO_RESOURCES;
+
+ memset(ctx, 0, sizeof(struct efct_command_ctx));
+
+ if (cb) {
+ ctx->cb = cb;
+ ctx->arg = arg;
+ }
+
+ memcpy(ctx->buf, cmd, SLI4_BMBX_SIZE);
+ ctx->ctx = hw;
+
+ spin_lock_irqsave(&hw->cmd_lock, flags);
+
+ /* Add to pending list */
+ INIT_LIST_HEAD(&ctx->list_entry);
+ list_add_tail(&ctx->list_entry, &hw->cmd_pending);
+
+ /* Submit as much of the pending list as we can */
+ rc = efct_hw_cmd_submit_pending(hw);
+
+ spin_unlock_irqrestore(&hw->cmd_lock, flags);
+ }
+
+ return rc;
+}
+
+static int
+efct_hw_command_process(struct efct_hw *hw, int status, u8 *mqe,
+ size_t size)
+{
+ struct efct_command_ctx *ctx = NULL;
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(&hw->cmd_lock, flags);
+ if (!list_empty(&hw->cmd_head)) {
+ ctx = list_first_entry(&hw->cmd_head,
+ struct efct_command_ctx, list_entry);
+ list_del_init(&ctx->list_entry);
+ }
+ if (!ctx) {
+ efc_log_err(hw->os, "no command context?!?\n");
+ spin_unlock_irqrestore(&hw->cmd_lock, flags);
+ return EFC_FAIL;
+ }
+
+ hw->cmd_head_count--;
+
+ /* Post any pending requests */
+ efct_hw_cmd_submit_pending(hw);
+
+ spin_unlock_irqrestore(&hw->cmd_lock, flags);
+
+ if (ctx->cb) {
+ memcpy(ctx->buf, mqe, size);
+ ctx->cb(hw, status, ctx->buf, ctx->arg);
+ }
+
+ mempool_free(ctx, hw->cmd_ctx_pool);
+
+ return EFC_SUCCESS;
+}
+
+static int
+efct_hw_mq_process(struct efct_hw *hw,
+ int status, struct sli4_queue *mq)
+{
+ u8 mqe[SLI4_BMBX_SIZE];
+
+ if (!sli_mq_read(&hw->sli, mq, mqe))
+ efct_hw_command_process(hw, status, mqe, mq->size);
+
efct_hw_command_process() returns an error status; shouldn't you be
evaluating that?
+ return EFC_SUCCESS;
+}
+
+static int
+efct_hw_command_cancel(struct efct_hw *hw)
+{
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(&hw->cmd_lock, flags);
+
+ /*
+ * Manually clean up remaining commands. Note: since this calls
+ * efct_hw_command_process(), we'll also process the cmd_pending
+ * list, so no need to manually clean that out.
+ */
+ while (!list_empty(&hw->cmd_head)) {
+ u8 mqe[SLI4_BMBX_SIZE] = { 0 };
+ struct efct_command_ctx *ctx;
+
+ ctx = list_first_entry(&hw->cmd_head,
+ struct efct_command_ctx, list_entry);
+
+ efc_log_debug(hw->os, "hung command %08x\n",
+ !ctx ? U32_MAX :
+ (!ctx->buf ? U32_MAX :
+ *((u32 *)ctx->buf)));
+ spin_unlock_irqrestore(&hw->cmd_lock, flags);
+ efct_hw_command_process(hw, -1, mqe, SLI4_BMBX_SIZE);
+ spin_lock_irqsave(&hw->cmd_lock, flags);
Same here.
+ }
+
+ spin_unlock_irqrestore(&hw->cmd_lock, flags);
+
+ return EFC_SUCCESS;
+}
+
+static void
+efct_mbox_rsp_cb(struct efct_hw *hw, int status, u8 *mqe, void *arg)
+{
+ struct efct_mbox_rqst_ctx *ctx = arg;
+
+ if (ctx) {
+ if (ctx->callback)
+ (*ctx->callback)(hw->os->efcport, status, mqe,
+ ctx->arg);
+
+ mempool_free(ctx, hw->mbox_rqst_pool);
+ }
+}
+
+int
+efct_issue_mbox_rqst(void *base, void *cmd, void *cb, void *arg)
+{
+ struct efct_mbox_rqst_ctx *ctx;
+ struct efct *efct = base;
+ struct efct_hw *hw = &efct->hw;
+
+ /*
+ * Allocate a callback context (which includes the mbox cmd buffer),
+ * we need this to be persistent as the mbox cmd submission may be
+ * queued and executed later execution.
+ */
+ ctx = mempool_alloc(hw->mbox_rqst_pool, GFP_ATOMIC);
+ if (!ctx)
+ return EFC_FAIL;
+
+ ctx->callback = cb;
+ ctx->arg = arg;
+
+ if (efct_hw_command(hw, cmd, EFCT_CMD_NOWAIT, efct_mbox_rsp_cb, ctx)) {
+ efc_log_err(efct, "issue mbox rqst failure\n");
+ mempool_free(ctx, hw->mbox_rqst_pool);
+ return EFC_FAIL;
You don't believe in return values, do you?
I think efct_hw_command() can return _different_ values than just
FAIL/SUCCESS (see my above comment about reset), so at the very least
you should be _looking_ at them.
+ }
+ return EFC_SUCCESS;
+}
diff --git a/drivers/scsi/elx/efct/efct_hw.h b/drivers/scsi/elx/efct/efct_hw.h
index 39cfe6658783..76de5decfbea 100644
--- a/drivers/scsi/elx/efct/efct_hw.h
+++ b/drivers/scsi/elx/efct/efct_hw.h
@@ -619,4 +619,13 @@ efct_get_wwnn(struct efct_hw *hw);
uint64_t
efct_get_wwpn(struct efct_hw *hw);
+enum efct_hw_rtn efct_hw_rx_allocate(struct efct_hw *hw);
+enum efct_hw_rtn efct_hw_rx_post(struct efct_hw *hw);
+void efct_hw_rx_free(struct efct_hw *hw);
+enum efct_hw_rtn
+efct_hw_command(struct efct_hw *hw, u8 *cmd, u32 opts, void *cb,
+ void *arg);
+int
+efct_issue_mbox_rqst(void *base, void *cmd, void *cb, void *arg);
+
#endif /* __EFCT_H__ */
Cheers,
Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
hare@xxxxxxx +49 911 74053 688
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer
