linux-kernel - [PATCH 5.15 004/132] kernel/resource: Introduce request_mem_region

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Date:   Mon, 23 May 2022 19:03:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Terry Bowman <terry.bowman@....com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Wolfram Sang <wsa@...nel.org>,
        Mario Limonciello <Mario.Limonciello@....com>
Subject: [PATCH 5.15 004/132] kernel/resource: Introduce request_mem_region_muxed()

From: Terry Bowman <terry.bowman@....com>

commit 27c196c7b73cb70bbed3a9df46563bab60e63415 upstream.

Support for requesting muxed memory region is implemented but not
currently callable as a macro. Add the request muxed memory
region macro.

MMIO memory accesses can be synchronized using request_mem_region() which
is already available. This call will return failure if the resource is
busy. The 'muxed' version of this macro will handle a busy resource by
using a wait queue to retry until the resource is available.

Signed-off-by: Terry Bowman <terry.bowman@....com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Signed-off-by: Wolfram Sang <wsa@...nel.org>
Cc: Mario Limonciello <Mario.Limonciello@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/linux/ioport.h |    2 ++
 1 file changed, 2 insertions(+)

--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -262,6 +262,8 @@ resource_union(struct resource *r1, stru
 #define request_muxed_region(start,n,name)	__request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED)
 #define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)
 #define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0)
+#define request_mem_region_muxed(start, n, name) \
+	__request_region(&iomem_resource, (start), (n), (name), IORESOURCE_MUXED)
 #define request_mem_region_exclusive(start,n,name) \
 	__request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE)
 #define rename_region(region, newname) do { (region)->name = (newname); } while (0)