IB/qib: Log all SDMA errors unconditionally

This patch adds code to log SDMA errors for supportability purposes.

Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/qib/qib_sdma.c b/drivers/infiniband/hw/qib/qib_sdma.c
index 3fc514431212..32162d355370 100644
--- a/drivers/infiniband/hw/qib/qib_sdma.c
+++ b/drivers/infiniband/hw/qib/qib_sdma.c
@@ -708,6 +708,62 @@ unlock:
 	return ret;
 }
 
+/*
+ * sdma_lock should be acquired before calling this routine
+ */
+void dump_sdma_state(struct qib_pportdata *ppd)
+{
+	struct qib_sdma_desc *descq;
+	struct qib_sdma_txreq *txp, *txpnext;
+	__le64 *descqp;
+	u64 desc[2];
+	dma_addr_t addr;
+	u16 gen, dwlen, dwoffset;
+	u16 head, tail, cnt;
+
+	head = ppd->sdma_descq_head;
+	tail = ppd->sdma_descq_tail;
+	cnt = qib_sdma_descq_freecnt(ppd);
+	descq = ppd->sdma_descq;
+
+	qib_dev_porterr(ppd->dd, ppd->port,
+		"SDMA ppd->sdma_descq_head: %u\n", head);
+	qib_dev_porterr(ppd->dd, ppd->port,
+		"SDMA ppd->sdma_descq_tail: %u\n", tail);
+	qib_dev_porterr(ppd->dd, ppd->port,
+		"SDMA sdma_descq_freecnt: %u\n", cnt);
+
+	/* print info for each entry in the descriptor queue */
+	while (head != tail) {
+		char flags[6] = { 'x', 'x', 'x', 'x', 'x', 0 };
+
+		descqp = &descq[head].qw[0];
+		desc[0] = le64_to_cpu(descqp[0]);
+		desc[1] = le64_to_cpu(descqp[1]);
+		flags[0] = (desc[0] & 1<<15) ? 'I' : '-';
+		flags[1] = (desc[0] & 1<<14) ? 'L' : 'S';
+		flags[2] = (desc[0] & 1<<13) ? 'H' : '-';
+		flags[3] = (desc[0] & 1<<12) ? 'F' : '-';
+		flags[4] = (desc[0] & 1<<11) ? 'L' : '-';
+		addr = (desc[1] << 32) | ((desc[0] >> 32) & 0xfffffffcULL);
+		gen = (desc[0] >> 30) & 3ULL;
+		dwlen = (desc[0] >> 14) & (0x7ffULL << 2);
+		dwoffset = (desc[0] & 0x7ffULL) << 2;
+		qib_dev_porterr(ppd->dd, ppd->port,
+			"SDMA sdmadesc[%u]: flags:%s addr:0x%016llx gen:%u len:%u bytes offset:%u bytes\n",
+			 head, flags, addr, gen, dwlen, dwoffset);
+		if (++head == ppd->sdma_descq_cnt)
+			head = 0;
+	}
+
+	/* print dma descriptor indices from the TX requests */
+	list_for_each_entry_safe(txp, txpnext, &ppd->sdma_activelist,
+				 list)
+		qib_dev_porterr(ppd->dd, ppd->port,
+			"SDMA txp->start_idx: %u txp->next_descq_idx: %u\n",
+			txp->start_idx, txp->next_descq_idx);
+}
+
 void qib_sdma_process_event(struct qib_pportdata *ppd,
 	enum qib_sdma_events event)
 {