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asm-generic: Add msi.h

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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>
This commit is contained in:
Thomas Gleixner 2014-11-17 18:09:34 +01:00
parent f3cf8bb0d6
commit 926ff9ad76
1 changed files with 32 additions and 0 deletions
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32
include/asm-generic/msi.h Normal file
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#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