From a2b9d4eadb7727772698d06e4cbeb1a1e2538675 Mon Sep 17 00:00:00 2001
From: Dominic Chen <d.c.ddcc@gmail.com>
Date: Mon, 9 Mar 2020 14:53:23 -0400
Subject: [PATCH] fpga: dfl: afu: support debug access to memory-mapped afu
 regions
Git-commit: a2b9d4eadb7727772698d06e4cbeb1a1e2538675
References: jsc#SLE-13441
Patch-mainline: v5.8-rc1

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>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 drivers/fpga/dfl-afu-main.c |    9 +++++++++
 drivers/fpga/dfl.h          |    1 +
 2 files changed, 10 insertions(+)

--- a/drivers/fpga/dfl-afu-main.c
+++ b/drivers/fpga/dfl-afu-main.c
@@ -637,6 +637,12 @@ static long afu_ioctl(struct file *filp,
 	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;
@@ -666,6 +672,9 @@ static int afu_mmap(struct file *filp, s
 	    !(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,
--- a/drivers/fpga/dfl.h
+++ b/drivers/fpga/dfl.h
@@ -182,6 +182,7 @@ struct dfl_feature_id {
 struct dfl_feature_driver {
 	const struct dfl_feature_id *id_table;
 	const struct dfl_feature_ops *ops;
+	void *priv;
 };
 
 /**