[Xen-devel] [RFC v3 2/4] xen/linux_compat: Add a Linux compat header

[Sameer Goel <sgoel@xxxxxxxxxxxxxx>]

For porting files from Linux it is useful to have a Linux API to Xen API
mapping header at a common location.
This file adds common API functions and other defines that are needed for
porting arm SMMU drivers.

---
 xen/include/xen/linux_compat.h | 106 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 xen/include/xen/linux_compat.h

diff --git a/xen/include/xen/linux_compat.h b/xen/include/xen/linux_compat.h
new file mode 100644
index 0000000..217e0cc
--- /dev/null
+++ b/xen/include/xen/linux_compat.h
@@ -0,0 +1,106 @@
+/******************************************************************************
+ * include/xen/linux_compat.h
+ *
+ * Compatibility defines for porting code from Linux to Xen
+ *
+ * Copyright (c) 2017 Linaro Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __XEN_LINUX_COMPAT_H__
+#define __XEN_LINUX_COMPAT_H__
+
+#include <asm/types.h>
+
+typedef paddr_t phys_addr_t;
+typedef paddr_t dma_addr_t;
+
+/* Alias to Xen device tree helpers */
+#define device_node dt_device_node
+#define of_phandle_args dt_phandle_args
+#define of_device_id dt_device_match
+#define of_match_node dt_match_node
+#define of_property_read_u32(np, pname, out) (!dt_property_read_u32(np, pname, 
out))
+#define of_property_read_bool dt_property_read_bool
+#define of_parse_phandle_with_args dt_parse_phandle_with_args
+/* The user should consider if it is safe to treat mutex as a spinlock */
+#define mutex spinlock_t
+#define mutex_init spin_lock_init
+#define mutex_lock spin_lock
+#define mutex_unlock spin_unlock
+
+#define ilog2 LOG_2
+
+#define readx_poll_timeout(op, addr, val, cond, sleep_us, timeout_us) \
+({ \
+    s_time_t deadline = NOW() + MICROSECS(timeout_us); \
+    for (;;) \
+    { \
+        (val) = op(addr); \
+        if ( cond ) \
+            break; \
+        if ( NOW() > deadline ) \
+        { \
+            (val) = op(addr); \
+            break; \
+        } \
+        udelay(sleep_us); \
+    } \
+    (cond) ? 0 : -ETIMEDOUT; \
+})
+
+#define readl_relaxed_poll_timeout(addr, val, cond, delay_us, timeout_us) \
+    readx_poll_timeout(readl_relaxed, addr, val, cond, delay_us, timeout_us)
+
+/* Xen: Helpers for IRQ functions */
+#define request_irq(irq, func, flags, name, dev) request_irq(irq, flags, func, 
name, dev)
+#define free_irq release_irq
+
+enum irqreturn {
+    IRQ_NONE    = (0 << 0),
+    IRQ_HANDLED = (1 << 0),
+    IRQ_WAKE_THREAD = (2 << 0),
+};
+
+typedef enum irqreturn irqreturn_t;
+
+/* Device logger functions */
+#define dev_print(dev, lvl, fmt, ...)                       \
+     printk(lvl fmt, ## __VA_ARGS__)
+
+#define dev_dbg(dev, fmt, ...) dev_print(dev, XENLOG_DEBUG, fmt, ## 
__VA_ARGS__)
+#define dev_notice(dev, fmt, ...) dev_print(dev, XENLOG_INFO, fmt, ## 
__VA_ARGS__)
+#define dev_warn(dev, fmt, ...) dev_print(dev, XENLOG_WARNING, fmt, ## 
__VA_ARGS__)
+#define dev_err(dev, fmt, ...) dev_print(dev, XENLOG_ERR, fmt, ## __VA_ARGS__)
+#define dev_info(dev, fmt, ...) dev_print(dev, XENLOG_INFO, fmt, ## 
__VA_ARGS__)
+
+#define dev_err_ratelimited(dev, fmt, ...)                  \
+     dev_print(dev, XENLOG_ERR, fmt, ## __VA_ARGS__)
+
+#define dev_name(dev) dt_node_full_name(dev_to_dt(dev))
+
+/* Alias to Xen allocation helpers */
+#define kfree xfree
+#define kmalloc(size, flags)        _xmalloc(size, sizeof(void *))
+#define kzalloc(size, flags)        _xzalloc(size, sizeof(void *))
+#define devm_kzalloc(dev, size, flags)  _xzalloc(size, sizeof(void *))
+#define kmalloc_array(size, n, flags)   _xmalloc_array(size, sizeof(void *), n)
+
+/* Alias to Xen time functions */
+#define ktime_t s_time_t
+#define ktime_add_us(t,i)       (NOW() + MICROSECS(i))
+#define ktime_compare(t,i)      (NOW() > (i))
+
+#endif /* __XEN_LINUX_COMPAT_H__ */
-- 
Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, Inc. 
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux 
Foundation Collaborative Project.


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel