- DP_INFO(p_hwfn->p_dev,
- "DORQ db_drop: address 0x%08x Opaque FID 0x%04x"
- " Size [bytes] 0x%08x Reason: 0x%08x\n",
- ecore_rd(p_hwfn, p_hwfn->p_dpc_ptt,
- DORQ_REG_DB_DROP_DETAILS_ADDRESS),
- (u16)(details & ECORE_DORQ_ATTENTION_OPAQUE_MASK),
- ((details & ECORE_DORQ_ATTENTION_SIZE_MASK) >>
- ECORE_DORQ_ATTENTION_SIZE_SHIFT) * 4, reason);
+ /* int_sts may be zero since all PFs were interrupted for doorbell
+ * overflow but another one already handled it. Can abort here. If
+ * This PF also requires overflow recovery we will be interrupted again
+ */
+ if (!int_sts)
+ return ECORE_SUCCESS;
+
+ /* check if db_drop or overflow happened */
+ if (int_sts & (DORQ_REG_INT_STS_DB_DROP |
+ DORQ_REG_INT_STS_DORQ_FIFO_OVFL_ERR)) {
+ /* obtain data about db drop/overflow */
+ first_drop_reason = ecore_rd(p_hwfn, p_ptt,
+ DORQ_REG_DB_DROP_REASON) &
+ ECORE_DORQ_ATTENTION_REASON_MASK;
+ details = ecore_rd(p_hwfn, p_ptt,
+ DORQ_REG_DB_DROP_DETAILS);
+ address = ecore_rd(p_hwfn, p_ptt,
+ DORQ_REG_DB_DROP_DETAILS_ADDRESS);
+ overflow = ecore_rd(p_hwfn, p_ptt,
+ DORQ_REG_PF_OVFL_STICKY);
+ all_drops_reason = ecore_rd(p_hwfn, p_ptt,
+ DORQ_REG_DB_DROP_DETAILS_REASON);
+
+ /* log info */
+ DP_NOTICE(p_hwfn->p_dev, false,
+ "Doorbell drop occurred\n"
+ "Address\t\t0x%08x\t(second BAR address)\n"
+ "FID\t\t0x%04x\t\t(Opaque FID)\n"
+ "Size\t\t0x%04x\t\t(in bytes)\n"
+ "1st drop reason\t0x%08x\t(details on first drop since last handling)\n"
+ "Sticky reasons\t0x%08x\t(all drop reasons since last handling)\n"
+ "Overflow\t0x%x\t\t(a per PF indication)\n",
+ address,
+ GET_FIELD(details, ECORE_DORQ_ATTENTION_OPAQUE),
+ GET_FIELD(details, ECORE_DORQ_ATTENTION_SIZE) * 4,
+ first_drop_reason, all_drops_reason, overflow);
+
+ /* if this PF caused overflow, initiate recovery */
+ if (overflow) {
+ rc = ecore_db_rec_attn(p_hwfn, p_ptt);
+ if (rc != ECORE_SUCCESS)
+ return rc;
+ }
+
+ /* clear the doorbell drop details and prepare for next drop */
+ ecore_wr(p_hwfn, p_ptt, DORQ_REG_DB_DROP_DETAILS_REL, 0);
+
+ /* mark interrupt as handeld (note: even if drop was due to a
+ * different reason than overflow we mark as handled)
+ */
+ ecore_wr(p_hwfn, p_ptt, DORQ_REG_INT_STS_WR,
+ DORQ_REG_INT_STS_DB_DROP |
+ DORQ_REG_INT_STS_DORQ_FIFO_OVFL_ERR);
+
+ /* if there are no indications otherthan drop indications,
+ * success
+ */
+ if ((int_sts & ~(DORQ_REG_INT_STS_DB_DROP |
+ DORQ_REG_INT_STS_DORQ_FIFO_OVFL_ERR |
+ DORQ_REG_INT_STS_DORQ_FIFO_AFULL)) == 0)
+ return ECORE_SUCCESS;