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fpga: dfl: afu: support debug access to memory-mapped afu regions

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Allow debug access to memory-mapped regions using e.g. gdb.

Signed-off-by: Dominic Chen <d.c.ddcc@gmail.com>
Acked-by: Wu Hao <hao.wu@intel.com>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
This commit is contained in:
Dominic Chen 2020-03-09 14:53:23 -04:00 committed by Moritz Fischer
parent 5a53881580
commit a2b9d4eadb
1 changed files with 9 additions and 0 deletions
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9
drivers/fpga/dfl-afu-main.c
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@ -750,6 +750,12 @@ static long afu_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return -EINVAL; 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) static int afu_mmap(struct file *filp, struct vm_area_struct *vma)
{ {
struct platform_device *pdev = filp->private_data; struct platform_device *pdev = filp->private_data;
@ -779,6 +785,9 @@ static int afu_mmap(struct file *filp, struct vm_area_struct *vma)
!(region.flags & DFL_PORT_REGION_WRITE)) !(region.flags & DFL_PORT_REGION_WRITE))
return -EPERM; return -EPERM;
/* Support debug access to the mapping */
vma->vm_ops = &afu_vma_ops;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
return remap_pfn_range(vma, vma->vm_start, return remap_pfn_range(vma, vma->vm_start,