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