From: Roy Pledge <Roy.Pledge@freescale.com>
To: <linuxppc-dev@lists.ozlabs.org>, <scottwood@freescale.com>
CC: <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [v2 07/11] soc/bman: Add debugfs support for the BMan driver
Date: Wed, 12 Aug 2015 16:14:53 -0400
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From: Geoff Thorpe <Geoff.Thorpe@freescale.com>

Add debugfs support for querying the state of hardware based
Buffer Manager pools used in DPAA 1.0.

Signed-off-by: Geoff Thorpe <Geoff.Thorpe@freescale.com>
Signed-off-by: Emil Medve <Emilian.Medve@Freescale.com>
Signed-off-by: Roy Pledge <Roy.Pledge@freescale.com>
---
 drivers/soc/fsl/qbman/Kconfig        |    7 ++
 drivers/soc/fsl/qbman/Makefile       |    1 +
 drivers/soc/fsl/qbman/bman-debugfs.c |  117 ++++++++++++++++++++++++++++++++++
 drivers/soc/fsl/qbman/bman_api.c     |   19 ++++++
 drivers/soc/fsl/qbman/dpaa_sys.h     |    7 +-
 5 files changed, 145 insertions(+), 6 deletions(-)
 create mode 100644 drivers/soc/fsl/qbman/bman-debugfs.c

diff --git a/drivers/soc/fsl/qbman/Kconfig b/drivers/soc/fsl/qbman/Kconfig
index 1f2063a..919ef15 100644
--- a/drivers/soc/fsl/qbman/Kconfig
+++ b/drivers/soc/fsl/qbman/Kconfig
@@ -54,6 +54,13 @@ config FSL_BMAN_TEST_THRESH
 	  "drainer" thread, and the other threads that they observe exactly
 	  the depletion state changes that are expected.
 
+config FSL_BMAN_DEBUGFS
+	tristate "BMan debugfs support"
+	depends on DEBUG_FS
+	default n
+	help
+		BMan debugfs support
+
 config FSL_QMAN
 	bool "QMan device management"
 	default n
diff --git a/drivers/soc/fsl/qbman/Makefile b/drivers/soc/fsl/qbman/Makefile
index 82f5482..2b53fbc 100644
--- a/drivers/soc/fsl/qbman/Makefile
+++ b/drivers/soc/fsl/qbman/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_FSL_BMAN_TEST)			+= bman-test.o
 bman-test-y					 = bman_test.o
 bman-test-$(CONFIG_FSL_BMAN_TEST_API)		+= bman_test_api.o
 bman-test-$(CONFIG_FSL_BMAN_TEST_THRESH)	+= bman_test_thresh.o
+obj-$(CONFIG_FSL_BMAN_DEBUGFS)			+= bman-debugfs.o
 
 obj-$(CONFIG_FSL_QMAN)				+= qman_api.o qman_utils.o qman_driver.o
 obj-$(CONFIG_FSL_QMAN_CONFIG)			+= qman.o qman_portal.o
diff --git a/drivers/soc/fsl/qbman/bman-debugfs.c b/drivers/soc/fsl/qbman/bman-debugfs.c
new file mode 100644
index 0000000..b384f47
--- /dev/null
+++ b/drivers/soc/fsl/qbman/bman-debugfs.c
@@ -0,0 +1,117 @@
+/* Copyright 2010 - 2015 Freescale Semiconductor, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *	 notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *	 notice, this list of conditions and the following disclaimer in the
+ *	 documentation and/or other materials provided with the distribution.
+ *     * Neither the name of Freescale Semiconductor nor the
+ *	 names of its contributors may be used to endorse or promote products
+ *	 derived from this software without specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "bman_priv.h"
+
+static struct dentry *dfs_root; /* debugfs root directory */
+
+/* Query Buffer Pool State */
+
+static int query_bp_state_show(struct seq_file *file, void *offset)
+{
+	int ret;
+	struct bm_pool_state state;
+	int i, j;
+	u32 mask;
+
+	memset(&state, 0, sizeof(state));
+	ret = bman_query_pools(&state);
+	if (ret) {
+		seq_printf(file, "Error %d\n", ret);
+		return ret;
+	}
+
+	seq_puts(file, "bp_id  free_buffers_avail  bp_depleted\n");
+	for (i = 0; i < 2; i++) {
+		mask = 0x80000000;
+		for (j = 0; j < 32; j++) {
+			seq_printf(file,
+			 "  %-2u	   %-3s		    %-3s\n",
+			 (i * 32) + j,
+			 state.as.state.__state[i] & mask ? "no" : "yes",
+			 state.ds.state.__state[i] & mask ? "yes" : "no");
+			 mask >>= 1;
+		}
+	}
+
+	return 0;
+}
+
+static int query_bp_state_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, query_bp_state_show, NULL);
+}
+
+static const struct file_operations query_bp_state_fops = {
+	.owner		= THIS_MODULE,
+	.open		= query_bp_state_open,
+	.read		= seq_read,
+	.release	= single_release,
+};
+
+static int __init bman_debugfs_init(void)
+{
+	int ret = 0;
+	struct dentry *d;
+
+	dfs_root = debugfs_create_dir("bman", NULL);
+	if (dfs_root == NULL) {
+		pr_err("Cannot create dir\n");
+		return -ENOMEM;
+	}
+
+	d = debugfs_create_file("query_bp_state",
+		S_IRUGO,
+		dfs_root,
+		NULL,
+		&query_bp_state_fops);
+	if (d == NULL) {
+		ret = -ENOMEM;
+		pr_err("Cannot create query_bp_state\n");
+		goto _return;
+	}
+
+	return 0;
+
+_return:
+	debugfs_remove_recursive(dfs_root);
+
+	return ret;
+}
+
+static void __exit bman_debugfs_exit(void)
+{
+	debugfs_remove_recursive(dfs_root);
+}
+
+module_init(bman_debugfs_init);
+module_exit(bman_debugfs_exit);
+
+MODULE_LICENSE("Dual BSD/GPL");
diff --git a/drivers/soc/fsl/qbman/bman_api.c b/drivers/soc/fsl/qbman/bman_api.c
index a389db9..d8918fc 100644
--- a/drivers/soc/fsl/qbman/bman_api.c
+++ b/drivers/soc/fsl/qbman/bman_api.c
@@ -1014,6 +1014,25 @@ int bman_flush_stockpile(struct bman_pool *pool, u32 flags)
 }
 EXPORT_SYMBOL(bman_flush_stockpile);
 
+int bman_query_pools(struct bm_pool_state *state)
+{
+	struct bman_portal *p = get_affine_portal();
+	struct bm_mc_result *mcr;
+	__maybe_unused unsigned long irqflags;
+
+	PORTAL_IRQ_LOCK(p, irqflags);
+	bm_mc_start(&p->p);
+	bm_mc_commit(&p->p, BM_MCC_VERB_CMD_QUERY);
+	while (!(mcr = bm_mc_result(&p->p)))
+		cpu_relax();
+	DPA_ASSERT((mcr->verb & BM_MCR_VERB_CMD_MASK) == BM_MCR_VERB_CMD_QUERY);
+	*state = mcr->query;
+	PORTAL_IRQ_UNLOCK(p, irqflags);
+	put_affine_portal();
+	return 0;
+}
+EXPORT_SYMBOL(bman_query_pools);
+
 #ifdef CONFIG_FSL_BMAN
 u32 bman_query_free_buffers(struct bman_pool *pool)
 {
diff --git a/drivers/soc/fsl/qbman/dpaa_sys.h b/drivers/soc/fsl/qbman/dpaa_sys.h
index cef9095..3cf446a 100644
--- a/drivers/soc/fsl/qbman/dpaa_sys.h
+++ b/drivers/soc/fsl/qbman/dpaa_sys.h
@@ -38,6 +38,7 @@
 #include <linux/of_irq.h>
 #include <linux/of_reserved_mem.h>
 #include <linux/kthread.h>
+#include <linux/debugfs.h>
 #include <linux/platform_device.h>
 #include <linux/ctype.h>
 
@@ -76,9 +77,7 @@ int dpaa_resource_reserve(struct dpaa_resource *alloc, u32 base, u32 num);
 #define DPA_PORTAL_CE 0
 #define DPA_PORTAL_CI 1
 
-/***********************/
 /* Misc inline assists */
-/***********************/
 
 /* TODO: NB, we currently assume that hwsync() and lwsync() imply compiler
  * barriers and that dcb*() won't fall victim to compiler or execution
@@ -157,9 +156,7 @@ static inline void copy_words(void *dest, const void *src, size_t sz)
 #define copy_words memcpy
 #endif
 
-/************/
 /* RB-trees */
-/************/
 
 /* We encapsulate RB-trees so that its easier to use non-linux forms in
  * non-linux systems. This also encapsulates the extra plumbing that linux code
@@ -215,9 +212,7 @@ static inline type *name##_find(struct dpa_rbtree *tree, u32 val) \
 	return NULL; \
 }
 
-/************/
 /* Bootargs */
-/************/
 
 /* QMan has "qportals=" and BMan has "bportals=", they use the same syntax
  * though; a comma-separated list of items, each item being a cpu index and/or a
-- 
1.7.9.5

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