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Date:   Thu,  7 Dec 2017 14:33:41 +0530
From:   Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, ganeshgr@...lsio.com, nirranjan@...lsio.com,
        indranil@...lsio.com,
        Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
Subject: [PATCH net-next 5/6] cxgb4: collect egress and ingress SGE queue contexts

Use meminfo to identify the egress and ingress context regions and
fetch all valid contexts from those regions. Also flush all contexts
before attempting collection to prevent stale information.

Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@...lsio.com>
---
 drivers/net/ethernet/chelsio/cxgb4/cudbg_entity.h |   1 +
 drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c    | 218 ++++++++++++++++++++--
 drivers/net/ethernet/chelsio/cxgb4/cxgb4.h        |   2 +-
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c   |   2 +-
 drivers/net/ethernet/chelsio/cxgb4/t4_hw.c        |   7 +-
 drivers/net/ethernet/chelsio/cxgb4/t4_hw.h        |   4 +-
 6 files changed, 210 insertions(+), 24 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cudbg_entity.h b/drivers/net/ethernet/chelsio/cxgb4/cudbg_entity.h
index 1e1719526e76..075916044980 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cudbg_entity.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/cudbg_entity.h
@@ -185,6 +185,7 @@ struct cudbg_tid_info_region_rev1 {
 	u32 reserved[16];
 };
 
+#define CUDBG_LOWMEM_MAX_CTXT_QIDS 256
 #define CUDBG_MAX_FL_QIDS 1024
 
 struct cudbg_ch_cntxt {
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c b/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
index e0644f69ddf1..74aaad5ca040 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
@@ -1594,22 +1594,108 @@ int cudbg_collect_tid(struct cudbg_init *pdbg_init,
 	return rc;
 }
 
-int cudbg_dump_context_size(struct adapter *padap)
+static int cudbg_sge_ctxt_check_valid(u32 *buf, int type)
+{
+	int index, bit, bit_pos = 0;
+
+	switch (type) {
+	case CTXT_EGRESS:
+		bit_pos = 176;
+		break;
+	case CTXT_INGRESS:
+		bit_pos = 141;
+		break;
+	case CTXT_FLM:
+		bit_pos = 89;
+		break;
+	}
+	index = bit_pos / 32;
+	bit =  bit_pos % 32;
+	return buf[index] & (1U << bit);
+}
+
+static int cudbg_get_ctxt_region_info(struct adapter *padap,
+				      struct cudbg_region_info *ctx_info,
+				      u8 *mem_type)
 {
-	u32 value, size;
+	struct cudbg_mem_desc mem_desc;
+	struct cudbg_meminfo meminfo;
+	u32 i, j, value, found;
 	u8 flq;
+	int rc;
+
+	rc = cudbg_fill_meminfo(padap, &meminfo);
+	if (rc)
+		return rc;
+
+	/* Get EGRESS and INGRESS context region size */
+	for (i = CTXT_EGRESS; i <= CTXT_INGRESS; i++) {
+		found = 0;
+		memset(&mem_desc, 0, sizeof(struct cudbg_mem_desc));
+		for (j = 0; j < ARRAY_SIZE(meminfo.avail); j++) {
+			rc = cudbg_get_mem_region(padap, &meminfo, j,
+						  cudbg_region[i],
+						  &mem_desc);
+			if (!rc) {
+				found = 1;
+				rc = cudbg_get_mem_relative(padap, &meminfo, j,
+							    &mem_desc.base,
+							    &mem_desc.limit);
+				if (rc) {
+					ctx_info[i].exist = false;
+					break;
+				}
+				ctx_info[i].exist = true;
+				ctx_info[i].start = mem_desc.base;
+				ctx_info[i].end = mem_desc.limit;
+				mem_type[i] = j;
+				break;
+			}
+		}
+		if (!found)
+			ctx_info[i].exist = false;
+	}
 
+	/* Get FLM and CNM max qid. */
 	value = t4_read_reg(padap, SGE_FLM_CFG_A);
 
 	/* Get number of data freelist queues */
 	flq = HDRSTARTFLQ_G(value);
-	size = CUDBG_MAX_FL_QIDS >> flq;
+	ctx_info[CTXT_FLM].exist = true;
+	ctx_info[CTXT_FLM].end = (CUDBG_MAX_FL_QIDS >> flq) * SGE_CTXT_SIZE;
 
-	/* Add extra space for congestion manager contexts.
-	 * The number of CONM contexts are same as number of freelist
+	/* The number of CONM contexts are same as number of freelist
 	 * queues.
 	 */
-	size += size;
+	ctx_info[CTXT_CNM].exist = true;
+	ctx_info[CTXT_CNM].end = ctx_info[CTXT_FLM].end;
+
+	return 0;
+}
+
+int cudbg_dump_context_size(struct adapter *padap)
+{
+	struct cudbg_region_info region_info[CTXT_CNM + 1] = { {0} };
+	u8 mem_type[CTXT_INGRESS + 1] = { 0 };
+	u32 i, size = 0;
+	int rc;
+
+	/* Get max valid qid for each type of queue */
+	rc = cudbg_get_ctxt_region_info(padap, region_info, mem_type);
+	if (rc)
+		return rc;
+
+	for (i = 0; i < CTXT_CNM; i++) {
+		if (!region_info[i].exist) {
+			if (i == CTXT_EGRESS || i == CTXT_INGRESS)
+				size += CUDBG_LOWMEM_MAX_CTXT_QIDS *
+					SGE_CTXT_SIZE;
+			continue;
+		}
+
+		size += (region_info[i].end - region_info[i].start + 1) /
+			SGE_CTXT_SIZE;
+	}
 	return size * sizeof(struct cudbg_ch_cntxt);
 }
 
@@ -1632,16 +1718,54 @@ static void cudbg_read_sge_ctxt(struct cudbg_init *pdbg_init, u32 cid,
 		t4_sge_ctxt_rd_bd(padap, cid, ctype, data);
 }
 
+static void cudbg_get_sge_ctxt_fw(struct cudbg_init *pdbg_init, u32 max_qid,
+				  u8 ctxt_type,
+				  struct cudbg_ch_cntxt **out_buff)
+{
+	struct cudbg_ch_cntxt *buff = *out_buff;
+	int rc;
+	u32 j;
+
+	for (j = 0; j < max_qid; j++) {
+		cudbg_read_sge_ctxt(pdbg_init, j, ctxt_type, buff->data);
+		rc = cudbg_sge_ctxt_check_valid(buff->data, ctxt_type);
+		if (!rc)
+			continue;
+
+		buff->cntxt_type = ctxt_type;
+		buff->cntxt_id = j;
+		buff++;
+		if (ctxt_type == CTXT_FLM) {
+			cudbg_read_sge_ctxt(pdbg_init, j, CTXT_CNM, buff->data);
+			buff->cntxt_type = CTXT_CNM;
+			buff->cntxt_id = j;
+			buff++;
+		}
+	}
+
+	*out_buff = buff;
+}
+
 int cudbg_collect_dump_context(struct cudbg_init *pdbg_init,
 			       struct cudbg_buffer *dbg_buff,
 			       struct cudbg_error *cudbg_err)
 {
+	struct cudbg_region_info region_info[CTXT_CNM + 1] = { {0} };
 	struct adapter *padap = pdbg_init->adap;
+	u32 j, size, max_ctx_size, max_ctx_qid;
+	u8 mem_type[CTXT_INGRESS + 1] = { 0 };
 	struct cudbg_buffer temp_buff = { 0 };
 	struct cudbg_ch_cntxt *buff;
-	u32 size, i = 0;
+	u64 *dst_off, *src_off;
+	u8 *ctx_buf;
+	u8 i, k;
 	int rc;
 
+	/* Get max valid qid for each type of queue */
+	rc = cudbg_get_ctxt_region_info(padap, region_info, mem_type);
+	if (rc)
+		return rc;
+
 	rc = cudbg_dump_context_size(padap);
 	if (rc <= 0)
 		return CUDBG_STATUS_ENTITY_NOT_FOUND;
@@ -1651,23 +1775,79 @@ int cudbg_collect_dump_context(struct cudbg_init *pdbg_init,
 	if (rc)
 		return rc;
 
+	/* Get buffer with enough space to read the biggest context
+	 * region in memory.
+	 */
+	max_ctx_size = max(region_info[CTXT_EGRESS].end -
+			   region_info[CTXT_EGRESS].start + 1,
+			   region_info[CTXT_INGRESS].end -
+			   region_info[CTXT_INGRESS].start + 1);
+
+	ctx_buf = kvzalloc(max_ctx_size, GFP_KERNEL);
+	if (!ctx_buf) {
+		cudbg_put_buff(&temp_buff, dbg_buff);
+		return -ENOMEM;
+	}
+
 	buff = (struct cudbg_ch_cntxt *)temp_buff.data;
-	while (size > 0) {
-		buff->cntxt_type = CTXT_FLM;
-		buff->cntxt_id = i;
-		cudbg_read_sge_ctxt(pdbg_init, i, CTXT_FLM, buff->data);
-		buff++;
-		size -= sizeof(struct cudbg_ch_cntxt);
 
-		buff->cntxt_type = CTXT_CNM;
-		buff->cntxt_id = i;
-		cudbg_read_sge_ctxt(pdbg_init, i, CTXT_CNM, buff->data);
-		buff++;
-		size -= sizeof(struct cudbg_ch_cntxt);
+	/* Collect EGRESS and INGRESS context data.
+	 * In case of failures, fallback to collecting via FW or
+	 * backdoor access.
+	 */
+	for (i = CTXT_EGRESS; i <= CTXT_INGRESS; i++) {
+		if (!region_info[i].exist) {
+			max_ctx_qid = CUDBG_LOWMEM_MAX_CTXT_QIDS;
+			cudbg_get_sge_ctxt_fw(pdbg_init, max_ctx_qid, i,
+					      &buff);
+			continue;
+		}
 
-		i++;
+		max_ctx_size = region_info[i].end - region_info[i].start + 1;
+		max_ctx_qid = max_ctx_size / SGE_CTXT_SIZE;
+
+		t4_sge_ctxt_flush(padap, padap->mbox, i);
+		rc = t4_memory_rw(padap, MEMWIN_NIC, mem_type[i],
+				  region_info[i].start, max_ctx_size,
+				  (__be32 *)ctx_buf, 1);
+		if (rc) {
+			max_ctx_qid = CUDBG_LOWMEM_MAX_CTXT_QIDS;
+			cudbg_get_sge_ctxt_fw(pdbg_init, max_ctx_qid, i,
+					      &buff);
+			continue;
+		}
+
+		for (j = 0; j < max_ctx_qid; j++) {
+			src_off = (u64 *)(ctx_buf + j * SGE_CTXT_SIZE);
+			dst_off = (u64 *)buff->data;
+
+			/* The data is stored in 64-bit cpu order.  Convert it
+			 * to big endian before parsing.
+			 */
+			for (k = 0; k < SGE_CTXT_SIZE / sizeof(u64); k++)
+				dst_off[k] = cpu_to_be64(src_off[k]);
+
+			rc = cudbg_sge_ctxt_check_valid(buff->data, i);
+			if (!rc)
+				continue;
+
+			buff->cntxt_type = i;
+			buff->cntxt_id = j;
+			buff++;
+		}
 	}
 
+	kvfree(ctx_buf);
+
+	/* Collect FREELIST and CONGESTION MANAGER contexts */
+	max_ctx_size = region_info[CTXT_FLM].end -
+		       region_info[CTXT_FLM].start + 1;
+	max_ctx_qid = max_ctx_size / SGE_CTXT_SIZE;
+	/* Since FLM and CONM are 1-to-1 mapped, the below function
+	 * will fetch both FLM and CONM contexts.
+	 */
+	cudbg_get_sge_ctxt_fw(pdbg_init, max_ctx_qid, CTXT_FLM, &buff);
+
 	cudbg_write_and_release_buff(&temp_buff, dbg_buff);
 	return rc;
 }
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h b/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
index e680beed9030..97dc3efeb234 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
@@ -1654,7 +1654,7 @@ int t4_ctrl_eq_free(struct adapter *adap, unsigned int mbox, unsigned int pf,
 		    unsigned int vf, unsigned int eqid);
 int t4_ofld_eq_free(struct adapter *adap, unsigned int mbox, unsigned int pf,
 		    unsigned int vf, unsigned int eqid);
-int t4_sge_ctxt_flush(struct adapter *adap, unsigned int mbox);
+int t4_sge_ctxt_flush(struct adapter *adap, unsigned int mbox, int ctxt_type);
 void t4_handle_get_port_info(struct port_info *pi, const __be64 *rpl);
 int t4_update_port_info(struct port_info *pi);
 int t4_get_link_params(struct port_info *pi, unsigned int *link_okp,
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
index 6f900ffe25cc..87ac1e4dafc1 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
@@ -1673,7 +1673,7 @@ int cxgb4_flush_eq_cache(struct net_device *dev)
 {
 	struct adapter *adap = netdev2adap(dev);
 
-	return t4_sge_ctxt_flush(adap, adap->mbox);
+	return t4_sge_ctxt_flush(adap, adap->mbox, CTXT_EGRESS);
 }
 EXPORT_SYMBOL(cxgb4_flush_eq_cache);
 
diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
index ccb2798c34d1..112963defd0b 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
@@ -6530,18 +6530,21 @@ void t4_sge_decode_idma_state(struct adapter *adapter, int state)
  *      t4_sge_ctxt_flush - flush the SGE context cache
  *      @adap: the adapter
  *      @mbox: mailbox to use for the FW command
+ *      @ctx_type: Egress or Ingress
  *
  *      Issues a FW command through the given mailbox to flush the
  *      SGE context cache.
  */
-int t4_sge_ctxt_flush(struct adapter *adap, unsigned int mbox)
+int t4_sge_ctxt_flush(struct adapter *adap, unsigned int mbox, int ctxt_type)
 {
 	int ret;
 	u32 ldst_addrspace;
 	struct fw_ldst_cmd c;
 
 	memset(&c, 0, sizeof(c));
-	ldst_addrspace = FW_LDST_CMD_ADDRSPACE_V(FW_LDST_ADDRSPC_SGE_EGRC);
+	ldst_addrspace = FW_LDST_CMD_ADDRSPACE_V(ctxt_type == CTXT_EGRESS ?
+						 FW_LDST_ADDRSPC_SGE_EGRC :
+						 FW_LDST_ADDRSPC_SGE_INGC);
 	c.op_to_addrspace = cpu_to_be32(FW_CMD_OP_V(FW_LDST_CMD) |
 					FW_CMD_REQUEST_F | FW_CMD_READ_F |
 					ldst_addrspace);
diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.h b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.h
index a964ed184356..83afb32c8491 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.h
@@ -70,7 +70,9 @@ enum {
 
 /* SGE context types */
 enum ctxt_type {
-	CTXT_FLM = 2,
+	CTXT_EGRESS,
+	CTXT_INGRESS,
+	CTXT_FLM,
 	CTXT_CNM,
 };
 
-- 
2.14.1

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