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path: root/drivers/fpga/dfl-afu-main.c
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Diffstat (limited to 'drivers/fpga/dfl-afu-main.c')
-rw-r--r--drivers/fpga/dfl-afu-main.c35
1 files changed, 24 insertions, 11 deletions
diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
index 65437b6a6842..b0c31789a909 100644
--- a/drivers/fpga/dfl-afu-main.c
+++ b/drivers/fpga/dfl-afu-main.c
@@ -561,14 +561,16 @@ static int afu_open(struct inode *inode, struct file *filp)
if (WARN_ON(!pdata))
return -ENODEV;
- ret = dfl_feature_dev_use_begin(pdata);
- if (ret)
- return ret;
-
- dev_dbg(&fdev->dev, "Device File Open\n");
- filp->private_data = fdev;
+ mutex_lock(&pdata->lock);
+ ret = dfl_feature_dev_use_begin(pdata, filp->f_flags & O_EXCL);
+ if (!ret) {
+ dev_dbg(&fdev->dev, "Device File Opened %d Times\n",
+ dfl_feature_dev_use_count(pdata));
+ filp->private_data = fdev;
+ }
+ mutex_unlock(&pdata->lock);
- return 0;
+ return ret;
}
static int afu_release(struct inode *inode, struct file *filp)
@@ -581,12 +583,14 @@ static int afu_release(struct inode *inode, struct file *filp)
pdata = dev_get_platdata(&pdev->dev);
mutex_lock(&pdata->lock);
- __port_reset(pdev);
- afu_dma_region_destroy(pdata);
- mutex_unlock(&pdata->lock);
-
dfl_feature_dev_use_end(pdata);
+ if (!dfl_feature_dev_use_count(pdata)) {
+ __port_reset(pdev);
+ afu_dma_region_destroy(pdata);
+ }
+ mutex_unlock(&pdata->lock);
+
return 0;
}
@@ -746,6 +750,12 @@ static long afu_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return -EINVAL;
}
+static const struct vm_operations_struct afu_vma_ops = {
+#ifdef CONFIG_HAVE_IOREMAP_PROT
+ .access = generic_access_phys,
+#endif
+};
+
static int afu_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct platform_device *pdev = filp->private_data;
@@ -775,6 +785,9 @@ static int afu_mmap(struct file *filp, struct vm_area_struct *vma)
!(region.flags & DFL_PORT_REGION_WRITE))
return -EPERM;
+ /* Support debug access to the mapping */
+ vma->vm_ops = &afu_vma_ops;
+
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
return remap_pfn_range(vma, vma->vm_start,