From 926ff9ad76e097011030feaee904395e06eea17a Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Mon, 17 Nov 2014 18:09:34 +0100 Subject: [PATCH] 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 Acked-by: Arnd Bergmann Cc: Jiang Liu Cc: Tony Luck Cc: linux-arm-kernel@lists.infradead.org Cc: Bjorn Helgaas Cc: Grant Likely Cc: Marc Zyngier Cc: Yijing Wang Cc: Yingjoe Chen Cc: Borislav Petkov Cc: Matthias Brugger Cc: Alexander Gordeev --- include/asm-generic/msi.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 include/asm-generic/msi.h diff --git a/include/asm-generic/msi.h b/include/asm-generic/msi.h new file mode 100644 index 000000000000..61c58d8878ce --- /dev/null +++ b/include/asm-generic/msi.h @@ -0,0 +1,32 @@ +#ifndef __ASM_GENERIC_MSI_H +#define __ASM_GENERIC_MSI_H + +#include + +#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 -- 2.39.5