Allow debug access to memory-mapped regions using e.g. gdb.
Signed-off-by: Dominic Chen <d.c.ddcc@xxxxxxxxx>
---
drivers/fpga/dfl-afu-main.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
index 02baa6a227c0..8fa1666b5b20 100644
--- a/drivers/fpga/dfl-afu-main.c
+++ b/drivers/fpga/dfl-afu-main.c
@@ -459,6 +459,12 @@ 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 /* CONFIG_HAVE_IOREMAP_PROT */
+};
+
static int afu_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct platform_device *pdev = filp->private_data;
@@ -488,6 +494,9 @@ 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,
--
2.17.1
