| 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; |
| 85 | |
