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From 2309613958ee518f94f1a7ba900e08e604e06048 Mon Sep 17 00:00:00 2001
From: Jack Veenstra <veenstra@android.com>
Date: Fri, 1 May 2009 18:50:10 -0700
Subject: [PATCH 133/134] [ARM] goldfish: qemutrace: Add mmap support.
This makes a page of data available for writing from user-space to allow
the Dalvik interpreter to send method trace information to the emulator.
Signed-off-by: Jack Veenstra <veenstra@android.com>
---
drivers/misc/qemutrace/qemu_trace.c | 35 ++++++++++++++++++++++++++++++++++-
1 files changed, 34 insertions(+), 1 deletions(-)
--- a/drivers/misc/qemutrace/qemu_trace.c
+++ b/drivers/misc/qemutrace/qemu_trace.c
@@ -53,6 +53,7 @@
static unsigned char __iomem *qt_base;
static int init_called;
+static uint32_t qemu_trace_paddr;
/* PIDs that start before our device registered */
#define MAX_INIT_PIDS 2048
@@ -330,8 +331,30 @@ static void qemu_trace_dump_init_threads
}
}
+static int qemu_trace_mmap_fop(struct file *file, struct vm_area_struct *vma)
+{
+ int ret = io_remap_pfn_range(vma, vma->vm_start,
+ (qemu_trace_paddr >> PAGE_SHIFT) + 1,
+ PAGE_SIZE, vma->vm_page_prot);
+ if (ret < 0)
+ return ret;
+ return 0;
+}
+
+static const struct file_operations qemu_trace_fops = {
+ .owner = THIS_MODULE,
+ .mmap = qemu_trace_mmap_fop,
+};
+
+static struct miscdevice qemu_trace_device = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "qemu_trace",
+ .fops = &qemu_trace_fops,
+};
+
static int qemu_trace_probe(struct platform_device *pdev)
{
+ int err;
struct resource *r;
/* not thread safe, but this should not happen */
@@ -340,18 +363,28 @@ static int qemu_trace_probe(struct platf
return -ENODEV;
}
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (r == NULL)
+ if (r == NULL || r->end - r->start < 2 * PAGE_SIZE - 1)
return -EINVAL;
+ qemu_trace_paddr = r->start;
qt_base = ioremap(r->start, PAGE_SIZE);
printk(KERN_INFO "QEMU TRACE Device: The mapped IO base is %p\n", qt_base);
qemu_trace_dump_init_threads();
+ err = misc_register(&qemu_trace_device);
+ if (err)
+ goto err_misc_register;
return 0;
+
+err_misc_register:
+ iounmap(qt_base);
+ qt_base = NULL;
+ return err;
}
static int qemu_trace_remove(struct platform_device *pdev)
{
+ misc_deregister(&qemu_trace_device);
iounmap(qt_base);
qt_base = NULL;
return 0;
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