target/linux/goldfish/patches-2.6.30/0133--ARM-goldfish-qemutrace-Add-mmap-support.patch

   1 From 2309613958ee518f94f1a7ba900e08e604e06048 Mon Sep 17 00:00:00 2001
   2 From: Jack Veenstra <veenstra@android.com>
   3 Date: Fri, 1 May 2009 18:50:10 -0700
   4 Subject: [PATCH 133/134] [ARM] goldfish: qemutrace: Add mmap support.
   5
   6 This makes a page of data available for writing from user-space to allow
   7 the Dalvik interpreter to send method trace information to the emulator.
   8
   9 Signed-off-by: Jack Veenstra <veenstra@android.com>
  10 ---
  11  drivers/misc/qemutrace/qemu_trace.c |   35 ++++++++++++++++++++++++++++++++++-
  12  1 files changed, 34 insertions(+), 1 deletions(-)
  13
  14 --- a/drivers/misc/qemutrace/qemu_trace.c
  15 +++ b/drivers/misc/qemutrace/qemu_trace.c
  16 @@ -53,6 +53,7 @@
  17
  18  static unsigned char __iomem *qt_base;
  19  static int init_called;
  20 +static uint32_t qemu_trace_paddr;
  21
  22  /* PIDs that start before our device registered */
  23  #define MAX_INIT_PIDS   2048
  24 @@ -330,8 +331,30 @@ static void qemu_trace_dump_init_threads
  25         }
  26  }
  27
  28 +static int qemu_trace_mmap_fop(struct file *file, struct vm_area_struct *vma)
  29 +{
  30 +       int ret = io_remap_pfn_range(vma, vma->vm_start,
  31 +                       (qemu_trace_paddr >> PAGE_SHIFT) + 1,
  32 +                       PAGE_SIZE, vma->vm_page_prot);
  33 +       if (ret < 0)
  34 +               return ret;
  35 +       return 0;
  36 +}
  37 +
  38 +static const struct file_operations qemu_trace_fops = {
  39 +       .owner = THIS_MODULE,
  40 +       .mmap = qemu_trace_mmap_fop,
  41 +};
  42 +
  43 +static struct miscdevice qemu_trace_device = {
  44 +       .minor = MISC_DYNAMIC_MINOR,
  45 +       .name = "qemu_trace",
  46 +       .fops = &qemu_trace_fops,
  47 +};
  48 +
  49  static int qemu_trace_probe(struct platform_device *pdev)
  50  {
  51 +       int err;
  52         struct resource *r;
  53
  54         /* not thread safe, but this should not happen */
  55 @@ -340,18 +363,28 @@ static int qemu_trace_probe(struct platf
  56                 return -ENODEV;
  57         }
  58         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  59 -       if (r == NULL)
  60 +       if (r == NULL || r->end - r->start < 2 * PAGE_SIZE - 1)
  61                 return -EINVAL;
  62 +       qemu_trace_paddr = r->start;
  63         qt_base = ioremap(r->start, PAGE_SIZE);
  64         printk(KERN_INFO "QEMU TRACE Device: The mapped IO base is %p\n", qt_base);
  65
  66         qemu_trace_dump_init_threads();
  67 +       err = misc_register(&qemu_trace_device);
  68 +       if (err)
  69 +               goto err_misc_register;
  70
  71         return 0;
  72 +
  73 +err_misc_register:
  74 +       iounmap(qt_base);
  75 +       qt_base = NULL;
  76 +       return err;
  77  }
  78
  79  static int qemu_trace_remove(struct platform_device *pdev)
  80  {
  81 +       misc_deregister(&qemu_trace_device);
  82         iounmap(qt_base);
  83         qt_base = NULL;
  84         return 0;