[dpdk-dev] [RFC Patch 10/39] bus/dpaa: add layer for interrupt emulation using pthread

[Shreyansh Jain <shreyansh.jain@nxp.com>]

An interrupt manager is implemented by emulating over pthreads.
Handlers are registered by QBMAN layer for being notified about
any interrupt request from DPAA blocks in userspace.

Signed-off-by: Roy Pledge <roy.pledge@freescale.com>
Signed-off-by: Hemant Agrawal <hemant.agrawal@nxp.com>
Signed-off-by: Shreyansh Jain <shreyansh.jain@nxp.com>
---
 drivers/bus/dpaa/Makefile              |   3 +-
 drivers/bus/dpaa/base/qbman/dpaa_sys.c | 136 +++++++++++++++++++++++++++++++++
 drivers/bus/dpaa/base/qbman/dpaa_sys.h |  65 ++++++++++++++++
 3 files changed, 203 insertions(+), 1 deletion(-)
 create mode 100644 drivers/bus/dpaa/base/qbman/dpaa_sys.c
 create mode 100644 drivers/bus/dpaa/base/qbman/dpaa_sys.h

diff --git a/drivers/bus/dpaa/Makefile b/drivers/bus/dpaa/Makefile
index 07c9880..591b65e 100644
--- a/drivers/bus/dpaa/Makefile
+++ b/drivers/bus/dpaa/Makefile
@@ -70,6 +70,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_DPAA_BUS) += \
 	base/fman/fman_hw.c \
 	base/fman/of.c \
 	base/fman/netcfg_layer.c \
-	base/qbman/process.c
+	base/qbman/process.c \
+	base/qbman/dpaa_sys.c
 
 include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/drivers/bus/dpaa/base/qbman/dpaa_sys.c b/drivers/bus/dpaa/base/qbman/dpaa_sys.c
new file mode 100644
index 0000000..0017da5
--- /dev/null
+++ b/drivers/bus/dpaa/base/qbman/dpaa_sys.c
@@ -0,0 +1,136 @@
+/*-
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ *   BSD LICENSE
+ *
+ * Copyright 2013-2016 Freescale Semiconductor Inc.
+ * Copyright 2017 NXP.
+ *
+ * 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 the above-listed copyright holders nor the
+ * names of any contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ *   GPL LICENSE SUMMARY
+ *
+ * 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT HOLDERS OR CONTRIBUTORS 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 <process.h>
+#include "dpaa_sys.h"
+
+struct process_interrupt {
+	int irq;
+	irqreturn_t (*isr)(int irq, void *arg);
+	unsigned long flags;
+	const char *name;
+	void *arg;
+	struct list_head node;
+};
+
+static COMPAT_LIST_HEAD(process_irq_list);
+static pthread_mutex_t process_irq_lock = PTHREAD_MUTEX_INITIALIZER;
+
+static void process_interrupt_install(struct process_interrupt *irq)
+{
+	int ret;
+	/* Add the irq to the end of the list */
+	ret = pthread_mutex_lock(&process_irq_lock);
+	assert(!ret);
+	list_add_tail(&irq->node, &process_irq_list);
+	ret = pthread_mutex_unlock(&process_irq_lock);
+	assert(!ret);
+}
+
+static void process_interrupt_remove(struct process_interrupt *irq)
+{
+	int ret;
+
+	ret = pthread_mutex_lock(&process_irq_lock);
+	assert(!ret);
+	list_del(&irq->node);
+	ret = pthread_mutex_unlock(&process_irq_lock);
+	assert(!ret);
+}
+
+static struct process_interrupt *process_interrupt_find(int irq_num)
+{
+	int ret;
+	struct process_interrupt *i = NULL;
+
+	ret = pthread_mutex_lock(&process_irq_lock);
+	assert(!ret);
+	list_for_each_entry(i, &process_irq_list, node) {
+		if (i->irq == irq_num)
+			goto done;
+	}
+done:
+	ret = pthread_mutex_unlock(&process_irq_lock);
+	assert(!ret);
+	return i;
+}
+
+/* This is the interface from the platform-agnostic driver code to (de)register
+ * interrupt handlers. We simply create/destroy corresponding structs.
+ */
+int qbman_request_irq(int irq, irqreturn_t (*isr)(int irq, void *arg),
+		      unsigned long flags, const char *name,
+		      void *arg __maybe_unused)
+{
+	struct process_interrupt *irq_node =
+		kmalloc(sizeof(*irq_node), GFP_KERNEL);
+
+	if (!irq_node)
+		return -ENOMEM;
+	irq_node->irq = irq;
+	irq_node->isr = isr;
+	irq_node->flags = flags;
+	irq_node->name = name;
+	irq_node->arg = arg;
+	process_interrupt_install(irq_node);
+	return 0;
+}
+
+int qbman_free_irq(int irq, __maybe_unused void *arg)
+{
+	struct process_interrupt *irq_node = process_interrupt_find(irq);
+
+	if (!irq_node)
+		return -EINVAL;
+	process_interrupt_remove(irq_node);
+	kfree(irq_node);
+	return 0;
+}
+
+/* This is the interface from the platform-specific driver code to obtain
+ * interrupt handlers that have been registered.
+ */
+void qbman_invoke_irq(int irq)
+{
+	struct process_interrupt *irq_node = process_interrupt_find(irq);
+
+	if (irq_node)
+		irq_node->isr(irq, irq_node->arg);
+}
diff --git a/drivers/bus/dpaa/base/qbman/dpaa_sys.h b/drivers/bus/dpaa/base/qbman/dpaa_sys.h
new file mode 100644
index 0000000..c53035a
--- /dev/null
+++ b/drivers/bus/dpaa/base/qbman/dpaa_sys.h
@@ -0,0 +1,65 @@
+/*-
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ *   BSD LICENSE
+ *
+ * Copyright 2008-2016 Freescale Semiconductor Inc.
+ * Copyright 2017 NXP.
+ *
+ * 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 the above-listed copyright holders nor the
+ * names of any contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ *   GPL LICENSE SUMMARY
+ *
+ * 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT HOLDERS OR CONTRIBUTORS 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.
+ */
+
+#ifndef __DPAA_SYS_H
+#define __DPAA_SYS_H
+
+#include <of.h>
+
+/* For 2-element tables related to cache-inhibited and cache-enabled mappings */
+#define DPAA_PORTAL_CE 0
+#define DPAA_PORTAL_CI 1
+
+#ifdef RTE_LIBRTE_DPAA_CHECKING
+#define DPAA_ASSERT(x) ASSERT(x)
+#else
+#define DPAA_ASSERT(x)	do {  } while (0)
+#endif
+
+/* This is the interface from the platform-agnostic driver code to (de)register
+ * interrupt handlers. We simply create/destroy corresponding structs.
+ */
+int qbman_request_irq(int irq, irqreturn_t (*isr)(int irq, void *arg),
+		      unsigned long flags, const char *name, void *arg);
+int qbman_free_irq(int irq, void *arg);
+
+void qbman_invoke_irq(int irq);
+
+#endif /* __DPAA_SYS_H */
-- 
2.7.4