}
}
+struct qed_mcp_cmd_elem {
+ struct list_head list;
+ struct qed_mcp_mb_params *p_mb_params;
+ u16 expected_seq_num;
+ bool b_is_completed;
+};
+
+/* Must be called while cmd_lock is acquired */
+static struct qed_mcp_cmd_elem *
+qed_mcp_cmd_add_elem(struct qed_hwfn *p_hwfn,
+ struct qed_mcp_mb_params *p_mb_params,
+ u16 expected_seq_num)
+{
+ struct qed_mcp_cmd_elem *p_cmd_elem = NULL;
+
+ p_cmd_elem = kzalloc(sizeof(*p_cmd_elem), GFP_ATOMIC);
+ if (!p_cmd_elem)
+ goto out;
+
+ p_cmd_elem->p_mb_params = p_mb_params;
+ p_cmd_elem->expected_seq_num = expected_seq_num;
+ list_add(&p_cmd_elem->list, &p_hwfn->mcp_info->cmd_list);
+out:
+ return p_cmd_elem;
+}
+
+/* Must be called while cmd_lock is acquired */
+static void qed_mcp_cmd_del_elem(struct qed_hwfn *p_hwfn,
+ struct qed_mcp_cmd_elem *p_cmd_elem)
+{
+ list_del(&p_cmd_elem->list);
+ kfree(p_cmd_elem);
+}
+
+/* Must be called while cmd_lock is acquired */
+static struct qed_mcp_cmd_elem *qed_mcp_cmd_get_elem(struct qed_hwfn *p_hwfn,
+ u16 seq_num)
+{
+ struct qed_mcp_cmd_elem *p_cmd_elem = NULL;
+
+ list_for_each_entry(p_cmd_elem, &p_hwfn->mcp_info->cmd_list, list) {
+ if (p_cmd_elem->expected_seq_num == seq_num)
+ return p_cmd_elem;
+ }
+
+ return NULL;
+}
+
int qed_mcp_free(struct qed_hwfn *p_hwfn)
{
if (p_hwfn->mcp_info) {
+ struct qed_mcp_cmd_elem *p_cmd_elem, *p_tmp;
+
kfree(p_hwfn->mcp_info->mfw_mb_cur);
kfree(p_hwfn->mcp_info->mfw_mb_shadow);
+
+ spin_lock_bh(&p_hwfn->mcp_info->cmd_lock);
+ list_for_each_entry_safe(p_cmd_elem,
+ p_tmp,
+ &p_hwfn->mcp_info->cmd_list, list) {
+ qed_mcp_cmd_del_elem(p_hwfn, p_cmd_elem);
+ }
+ spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
}
+
kfree(p_hwfn->mcp_info);
return 0;
p_info->drv_pulse_seq = DRV_MB_RD(p_hwfn, p_ptt, drv_pulse_mb) &
DRV_PULSE_SEQ_MASK;
- p_info->mcp_hist = (u16)qed_rd(p_hwfn, p_ptt, MISCS_REG_GENERIC_POR_0);
+ p_info->mcp_hist = qed_rd(p_hwfn, p_ptt, MISCS_REG_GENERIC_POR_0);
return 0;
}
goto err;
p_info = p_hwfn->mcp_info;
+ /* Initialize the MFW spinlock */
+ spin_lock_init(&p_info->cmd_lock);
+ spin_lock_init(&p_info->link_lock);
+
+ INIT_LIST_HEAD(&p_info->cmd_list);
+
if (qed_load_mcp_offsets(p_hwfn, p_ptt) != 0) {
DP_NOTICE(p_hwfn, "MCP is not initialized\n");
/* Do not free mcp_info here, since public_base indicate that
if (!p_info->mfw_mb_shadow || !p_info->mfw_mb_addr)
goto err;
- /* Initialize the MFW spinlock */
- spin_lock_init(&p_info->lock);
- spin_lock_init(&p_info->link_lock);
-
return 0;
err:
return -ENOMEM;
}
-/* Locks the MFW mailbox of a PF to ensure a single access.
- * The lock is achieved in most cases by holding a spinlock, causing other
- * threads to wait till a previous access is done.
- * In some cases (currently when a [UN]LOAD_REQ commands are sent), the single
- * access is achieved by setting a blocking flag, which will fail other
- * competing contexts to send their mailboxes.
- */
-static int qed_mcp_mb_lock(struct qed_hwfn *p_hwfn, u32 cmd)
+static void qed_mcp_reread_offsets(struct qed_hwfn *p_hwfn,
+ struct qed_ptt *p_ptt)
{
- spin_lock_bh(&p_hwfn->mcp_info->lock);
-
- /* The spinlock shouldn't be acquired when the mailbox command is
- * [UN]LOAD_REQ, since the engine is locked by the MFW, and a parallel
- * pending [UN]LOAD_REQ command of another PF together with a spinlock
- * (i.e. interrupts are disabled) - can lead to a deadlock.
- * It is assumed that for a single PF, no other mailbox commands can be
- * sent from another context while sending LOAD_REQ, and that any
- * parallel commands to UNLOAD_REQ can be cancelled.
- */
- if (cmd == DRV_MSG_CODE_LOAD_DONE || cmd == DRV_MSG_CODE_UNLOAD_DONE)
- p_hwfn->mcp_info->block_mb_sending = false;
+ u32 generic_por_0 = qed_rd(p_hwfn, p_ptt, MISCS_REG_GENERIC_POR_0);
- if (p_hwfn->mcp_info->block_mb_sending) {
- DP_NOTICE(p_hwfn,
- "Trying to send a MFW mailbox command [0x%x] in parallel to [UN]LOAD_REQ. Aborting.\n",
- cmd);
- spin_unlock_bh(&p_hwfn->mcp_info->lock);
- return -EBUSY;
- }
+ /* Use MCP history register to check if MCP reset occurred between init
+ * time and now.
+ */
+ if (p_hwfn->mcp_info->mcp_hist != generic_por_0) {
+ DP_VERBOSE(p_hwfn,
+ QED_MSG_SP,
+ "Rereading MCP offsets [mcp_hist 0x%08x, generic_por_0 0x%08x]\n",
+ p_hwfn->mcp_info->mcp_hist, generic_por_0);
- if (cmd == DRV_MSG_CODE_LOAD_REQ || cmd == DRV_MSG_CODE_UNLOAD_REQ) {
- p_hwfn->mcp_info->block_mb_sending = true;
- spin_unlock_bh(&p_hwfn->mcp_info->lock);
+ qed_load_mcp_offsets(p_hwfn, p_ptt);
+ qed_mcp_cmd_port_init(p_hwfn, p_ptt);
}
-
- return 0;
-}
-
-static void qed_mcp_mb_unlock(struct qed_hwfn *p_hwfn, u32 cmd)
-{
- if (cmd != DRV_MSG_CODE_LOAD_REQ && cmd != DRV_MSG_CODE_UNLOAD_REQ)
- spin_unlock_bh(&p_hwfn->mcp_info->lock);
}
int qed_mcp_reset(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
{
- u32 seq = ++p_hwfn->mcp_info->drv_mb_seq;
- u8 delay = CHIP_MCP_RESP_ITER_US;
- u32 org_mcp_reset_seq, cnt = 0;
+ u32 org_mcp_reset_seq, seq, delay = CHIP_MCP_RESP_ITER_US, cnt = 0;
int rc = 0;
- /* Ensure that only a single thread is accessing the mailbox at a
- * certain time.
- */
- rc = qed_mcp_mb_lock(p_hwfn, DRV_MSG_CODE_MCP_RESET);
- if (rc != 0)
- return rc;
+ /* Ensure that only a single thread is accessing the mailbox */
+ spin_lock_bh(&p_hwfn->mcp_info->cmd_lock);
- /* Set drv command along with the updated sequence */
org_mcp_reset_seq = qed_rd(p_hwfn, p_ptt, MISCS_REG_GENERIC_POR_0);
- DRV_MB_WR(p_hwfn, p_ptt, drv_mb_header,
- (DRV_MSG_CODE_MCP_RESET | seq));
+
+ /* Set drv command along with the updated sequence */
+ qed_mcp_reread_offsets(p_hwfn, p_ptt);
+ seq = ++p_hwfn->mcp_info->drv_mb_seq;
+ DRV_MB_WR(p_hwfn, p_ptt, drv_mb_header, (DRV_MSG_CODE_MCP_RESET | seq));
do {
/* Wait for MFW response */
rc = -EAGAIN;
}
- qed_mcp_mb_unlock(p_hwfn, DRV_MSG_CODE_MCP_RESET);
+ spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
return rc;
}
-static int qed_do_mcp_cmd(struct qed_hwfn *p_hwfn,
- struct qed_ptt *p_ptt,
- u32 cmd,
- u32 param,
- u32 *o_mcp_resp,
- u32 *o_mcp_param)
+/* Must be called while cmd_lock is acquired */
+static bool qed_mcp_has_pending_cmd(struct qed_hwfn *p_hwfn)
{
- u8 delay = CHIP_MCP_RESP_ITER_US;
- u32 seq, cnt = 1, actual_mb_seq;
- int rc = 0;
+ struct qed_mcp_cmd_elem *p_cmd_elem;
- /* Get actual driver mailbox sequence */
- actual_mb_seq = DRV_MB_RD(p_hwfn, p_ptt, drv_mb_header) &
- DRV_MSG_SEQ_NUMBER_MASK;
-
- /* Use MCP history register to check if MCP reset occurred between
- * init time and now.
+ /* There is at most one pending command at a certain time, and if it
+ * exists - it is placed at the HEAD of the list.
*/
- if (p_hwfn->mcp_info->mcp_hist !=
- qed_rd(p_hwfn, p_ptt, MISCS_REG_GENERIC_POR_0)) {
- DP_VERBOSE(p_hwfn, QED_MSG_SP, "Rereading MCP offsets\n");
- qed_load_mcp_offsets(p_hwfn, p_ptt);
- qed_mcp_cmd_port_init(p_hwfn, p_ptt);
+ if (!list_empty(&p_hwfn->mcp_info->cmd_list)) {
+ p_cmd_elem = list_first_entry(&p_hwfn->mcp_info->cmd_list,
+ struct qed_mcp_cmd_elem, list);
+ return !p_cmd_elem->b_is_completed;
}
- seq = ++p_hwfn->mcp_info->drv_mb_seq;
- /* Set drv param */
- DRV_MB_WR(p_hwfn, p_ptt, drv_mb_param, param);
+ return false;
+}
+
+/* Must be called while cmd_lock is acquired */
+static int
+qed_mcp_update_pending_cmd(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
+{
+ struct qed_mcp_mb_params *p_mb_params;
+ struct qed_mcp_cmd_elem *p_cmd_elem;
+ u32 mcp_resp;
+ u16 seq_num;
- /* Set drv command along with the updated sequence */
- DRV_MB_WR(p_hwfn, p_ptt, drv_mb_header, (cmd | seq));
+ mcp_resp = DRV_MB_RD(p_hwfn, p_ptt, fw_mb_header);
+ seq_num = (u16)(mcp_resp & FW_MSG_SEQ_NUMBER_MASK);
+
+ /* Return if no new non-handled response has been received */
+ if (seq_num != p_hwfn->mcp_info->drv_mb_seq)
+ return -EAGAIN;
+
+ p_cmd_elem = qed_mcp_cmd_get_elem(p_hwfn, seq_num);
+ if (!p_cmd_elem) {
+ DP_ERR(p_hwfn,
+ "Failed to find a pending mailbox cmd that expects sequence number %d\n",
+ seq_num);
+ return -EINVAL;
+ }
+
+ p_mb_params = p_cmd_elem->p_mb_params;
+
+ /* Get the MFW response along with the sequence number */
+ p_mb_params->mcp_resp = mcp_resp;
+
+ /* Get the MFW param */
+ p_mb_params->mcp_param = DRV_MB_RD(p_hwfn, p_ptt, fw_mb_param);
+
+ /* Get the union data */
+ if (p_mb_params->p_data_dst != NULL) {
+ u32 union_data_addr = p_hwfn->mcp_info->drv_mb_addr +
+ offsetof(struct public_drv_mb,
+ union_data);
+ qed_memcpy_from(p_hwfn, p_ptt, p_mb_params->p_data_dst,
+ union_data_addr, sizeof(union drv_union_data));
+ }
+
+ p_cmd_elem->b_is_completed = true;
+
+ return 0;
+}
+
+/* Must be called while cmd_lock is acquired */
+static void __qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
+ struct qed_ptt *p_ptt,
+ struct qed_mcp_mb_params *p_mb_params,
+ u16 seq_num)
+{
+ union drv_union_data union_data;
+ u32 union_data_addr;
+
+ /* Set the union data */
+ union_data_addr = p_hwfn->mcp_info->drv_mb_addr +
+ offsetof(struct public_drv_mb, union_data);
+ memset(&union_data, 0, sizeof(union_data));
+ if (p_mb_params->p_data_src != NULL)
+ memcpy(&union_data, p_mb_params->p_data_src,
+ sizeof(union_data));
+ qed_memcpy_to(p_hwfn, p_ptt, union_data_addr, &union_data,
+ sizeof(union_data));
+
+ /* Set the drv param */
+ DRV_MB_WR(p_hwfn, p_ptt, drv_mb_param, p_mb_params->param);
+
+ /* Set the drv command along with the sequence number */
+ DRV_MB_WR(p_hwfn, p_ptt, drv_mb_header, (p_mb_params->cmd | seq_num));
DP_VERBOSE(p_hwfn, QED_MSG_SP,
- "wrote command (%x) to MFW MB param 0x%08x\n",
- (cmd | seq), param);
+ "MFW mailbox: command 0x%08x param 0x%08x\n",
+ (p_mb_params->cmd | seq_num), p_mb_params->param);
+}
+static int
+_qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
+ struct qed_ptt *p_ptt,
+ struct qed_mcp_mb_params *p_mb_params,
+ u32 max_retries, u32 delay)
+{
+ struct qed_mcp_cmd_elem *p_cmd_elem;
+ u32 cnt = 0;
+ u16 seq_num;
+ int rc = 0;
+
+ /* Wait until the mailbox is non-occupied */
do {
- /* Wait for MFW response */
+ /* Exit the loop if there is no pending command, or if the
+ * pending command is completed during this iteration.
+ * The spinlock stays locked until the command is sent.
+ */
+
+ spin_lock_bh(&p_hwfn->mcp_info->cmd_lock);
+
+ if (!qed_mcp_has_pending_cmd(p_hwfn))
+ break;
+
+ rc = qed_mcp_update_pending_cmd(p_hwfn, p_ptt);
+ if (!rc)
+ break;
+ else if (rc != -EAGAIN)
+ goto err;
+
+ spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
udelay(delay);
- *o_mcp_resp = DRV_MB_RD(p_hwfn, p_ptt, fw_mb_header);
+ } while (++cnt < max_retries);
+
+ if (cnt >= max_retries) {
+ DP_NOTICE(p_hwfn,
+ "The MFW mailbox is occupied by an uncompleted command. Failed to send command 0x%08x [param 0x%08x].\n",
+ p_mb_params->cmd, p_mb_params->param);
+ return -EAGAIN;
+ }
- /* Give the FW up to 5 second (500*10ms) */
- } while ((seq != (*o_mcp_resp & FW_MSG_SEQ_NUMBER_MASK)) &&
- (cnt++ < QED_DRV_MB_MAX_RETRIES));
+ /* Send the mailbox command */
+ qed_mcp_reread_offsets(p_hwfn, p_ptt);
+ seq_num = ++p_hwfn->mcp_info->drv_mb_seq;
+ p_cmd_elem = qed_mcp_cmd_add_elem(p_hwfn, p_mb_params, seq_num);
+ if (!p_cmd_elem)
+ goto err;
- DP_VERBOSE(p_hwfn, QED_MSG_SP,
- "[after %d ms] read (%x) seq is (%x) from FW MB\n",
- cnt * delay, *o_mcp_resp, seq);
-
- /* Is this a reply to our command? */
- if (seq == (*o_mcp_resp & FW_MSG_SEQ_NUMBER_MASK)) {
- *o_mcp_resp &= FW_MSG_CODE_MASK;
- /* Get the MCP param */
- *o_mcp_param = DRV_MB_RD(p_hwfn, p_ptt, fw_mb_param);
- } else {
- /* FW BUG! */
- DP_ERR(p_hwfn, "MFW failed to respond [cmd 0x%x param 0x%x]\n",
- cmd, param);
- *o_mcp_resp = 0;
- rc = -EAGAIN;
+ __qed_mcp_cmd_and_union(p_hwfn, p_ptt, p_mb_params, seq_num);
+ spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
+
+ /* Wait for the MFW response */
+ do {
+ /* Exit the loop if the command is already completed, or if the
+ * command is completed during this iteration.
+ * The spinlock stays locked until the list element is removed.
+ */
+
+ udelay(delay);
+ spin_lock_bh(&p_hwfn->mcp_info->cmd_lock);
+
+ if (p_cmd_elem->b_is_completed)
+ break;
+
+ rc = qed_mcp_update_pending_cmd(p_hwfn, p_ptt);
+ if (!rc)
+ break;
+ else if (rc != -EAGAIN)
+ goto err;
+
+ spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
+ } while (++cnt < max_retries);
+
+ if (cnt >= max_retries) {
+ DP_NOTICE(p_hwfn,
+ "The MFW failed to respond to command 0x%08x [param 0x%08x].\n",
+ p_mb_params->cmd, p_mb_params->param);
+
+ spin_lock_bh(&p_hwfn->mcp_info->cmd_lock);
+ qed_mcp_cmd_del_elem(p_hwfn, p_cmd_elem);
+ spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
+
+ return -EAGAIN;
}
+
+ qed_mcp_cmd_del_elem(p_hwfn, p_cmd_elem);
+ spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
+
+ DP_VERBOSE(p_hwfn,
+ QED_MSG_SP,
+ "MFW mailbox: response 0x%08x param 0x%08x [after %d.%03d ms]\n",
+ p_mb_params->mcp_resp,
+ p_mb_params->mcp_param,
+ (cnt * delay) / 1000, (cnt * delay) % 1000);
+
+ /* Clear the sequence number from the MFW response */
+ p_mb_params->mcp_resp &= FW_MSG_CODE_MASK;
+
+ return 0;
+
+err:
+ spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
return rc;
}
struct qed_ptt *p_ptt,
struct qed_mcp_mb_params *p_mb_params)
{
- u32 union_data_addr;
-
- int rc;
+ u32 max_retries = QED_DRV_MB_MAX_RETRIES;
+ u32 delay = CHIP_MCP_RESP_ITER_US;
/* MCP not initialized */
if (!qed_mcp_is_init(p_hwfn)) {
return -EBUSY;
}
- union_data_addr = p_hwfn->mcp_info->drv_mb_addr +
- offsetof(struct public_drv_mb, union_data);
-
- /* Ensure that only a single thread is accessing the mailbox at a
- * certain time.
- */
- rc = qed_mcp_mb_lock(p_hwfn, p_mb_params->cmd);
- if (rc)
- return rc;
-
- if (p_mb_params->p_data_src != NULL)
- qed_memcpy_to(p_hwfn, p_ptt, union_data_addr,
- p_mb_params->p_data_src,
- sizeof(*p_mb_params->p_data_src));
-
- rc = qed_do_mcp_cmd(p_hwfn, p_ptt, p_mb_params->cmd,
- p_mb_params->param, &p_mb_params->mcp_resp,
- &p_mb_params->mcp_param);
-
- if (p_mb_params->p_data_dst != NULL)
- qed_memcpy_from(p_hwfn, p_ptt, p_mb_params->p_data_dst,
- union_data_addr,
- sizeof(*p_mb_params->p_data_dst));
-
- qed_mcp_mb_unlock(p_hwfn, p_mb_params->cmd);
-
- return rc;
+ return _qed_mcp_cmd_and_union(p_hwfn, p_ptt, p_mb_params, max_retries,
+ delay);
}
int qed_mcp_cmd(struct qed_hwfn *p_hwfn,
projects / platform / kernel / linux-rpi.git / commitdiff