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git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
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Thomas Gleixner
926ff9ad76
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 <[email protected]> Acked-by: Arnd Bergmann <[email protected]> Cc: Jiang Liu <[email protected]> Cc: Tony Luck <[email protected]> Cc: [email protected] Cc: Bjorn Helgaas <[email protected]> Cc: Grant Likely <[email protected]> Cc: Marc Zyngier <[email protected]> Cc: Yijing Wang <[email protected]> Cc: Yingjoe Chen <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Matthias Brugger <[email protected]> Cc: Alexander Gordeev <[email protected]>
33 lines
799 B
C
33 lines
799 B
C
#ifndef __ASM_GENERIC_MSI_H
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#define __ASM_GENERIC_MSI_H
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#include <linux/types.h>
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#ifndef NUM_MSI_ALLOC_SCRATCHPAD_REGS
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# define NUM_MSI_ALLOC_SCRATCHPAD_REGS 2
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#endif
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struct msi_desc;
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/**
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* struct msi_alloc_info - Default structure for MSI interrupt allocation.
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* @desc: Pointer to msi descriptor
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* @hwirq: Associated hw interrupt number in the domain
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* @scratchpad: Storage for implementation specific scratch data
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*
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* Architectures can provide their own implementation by not including
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* asm-generic/msi.h into their arch specific header file.
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*/
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typedef struct msi_alloc_info {
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struct msi_desc *desc;
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irq_hw_number_t hwirq;
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union {
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unsigned long ul;
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void *ptr;
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} scratchpad[NUM_MSI_ALLOC_SCRATCHPAD_REGS];
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} msi_alloc_info_t;
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#define GENERIC_MSI_DOMAIN_OPS 1
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#endif
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