Commit 926ff9ad authored Nov 17, 2014 by Thomas Gleixner

asm-generic: Add msi.h



To support MSI irq domains we want a generic data structure for
allocation, but we need the option to provide an architecture specific
version of it. So instead of playing #ifdef games in linux/msi.h we
add a generic header file and let architectures decide whether to
include it or to provide their own implementation and provide the
required typedef.

I know that typedefs are not really nice, but in this case there are no
forward declarations required and it's the simplest solution.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Yijing Wang <wangyijing@huawei.com>
Cc: Yingjoe Chen <yingjoe.chen@mediatek.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Alexander Gordeev <agordeev@redhat.com>

parent f3cf8bb0

include/asm-generic/msi.h

0 → 100644

+32 −0

Original line number	Diff line number	Diff line
		#ifndef __ASM_GENERIC_MSI_H
		#define __ASM_GENERIC_MSI_H

		#include <linux/types.h>

		#ifndef NUM_MSI_ALLOC_SCRATCHPAD_REGS
		# define NUM_MSI_ALLOC_SCRATCHPAD_REGS 2
		#endif

		struct msi_desc;

		/**
		* struct msi_alloc_info - Default structure for MSI interrupt allocation.
		* @desc: Pointer to msi descriptor
		* @hwirq: Associated hw interrupt number in the domain
		* @scratchpad: Storage for implementation specific scratch data
		*
		* Architectures can provide their own implementation by not including
		* asm-generic/msi.h into their arch specific header file.
		*/
		typedef struct msi_alloc_info {
		struct msi_desc *desc;
		irq_hw_number_t hwirq;
		union {
		unsigned long ul;
		void *ptr;
		} scratchpad[NUM_MSI_ALLOC_SCRATCHPAD_REGS];
		} msi_alloc_info_t;

		#define GENERIC_MSI_DOMAIN_OPS 1

		#endif