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Commit 02a8e5bc authored by Alastair D'Silva's avatar Alastair D'Silva Committed by Michael Ellerman
Browse files

ocxl: Add an IOCTL so userspace knows what OCXL features are available 



In order for a userspace AFU driver to call the POWER9 specific
OCXL_IOCTL_ENABLE_P9_WAIT, it needs to verify that it can actually
make that call.

Signed-off-by: default avatarAlastair D'Silva <alastair@d-silva.org>
Acked-by: default avatarFrederic Barrat <fbarrat@linux.vnet.ibm.com>
Acked-by: default avatarAndrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent e948e06f

drivers/misc/ocxl/file.c

+25 −0
Original line number Diff line number Diff line
@@ -168,12 +168,32 @@ static long afu_ioctl_enable_p9_wait(struct ocxl_context *ctx, 
}

#endif





static long afu_ioctl_get_features(struct ocxl_context *ctx,

		struct ocxl_ioctl_features __user *uarg)

{

	struct ocxl_ioctl_features arg;



	memset(&arg, 0, sizeof(arg));



#ifdef CONFIG_PPC64

	if (cpu_has_feature(CPU_FTR_P9_TIDR))

		arg.flags[0] |= OCXL_IOCTL_FEATURES_FLAGS0_P9_WAIT;

#endif



	if (copy_to_user(uarg, &arg, sizeof(arg)))

		return -EFAULT;



	return 0;

}



#define CMD_STR(x) (x == OCXL_IOCTL_ATTACH ? "ATTACH" :			\

			x == OCXL_IOCTL_IRQ_ALLOC ? "IRQ_ALLOC" :	\

			x == OCXL_IOCTL_IRQ_FREE ? "IRQ_FREE" :		\

			x == OCXL_IOCTL_IRQ_SET_FD ? "IRQ_SET_FD" :	\

			x == OCXL_IOCTL_GET_METADATA ? "GET_METADATA" :	\

			x == OCXL_IOCTL_ENABLE_P9_WAIT ? "ENABLE_P9_WAIT" :	\

			x == OCXL_IOCTL_GET_FEATURES ? "GET_FEATURES" :	\

			"UNKNOWN")



static long afu_ioctl(struct file *file, unsigned int cmd,
@@ -239,6 +259,11 @@ static long afu_ioctl(struct file *file, unsigned int cmd, 
		break;

#endif



	case OCXL_IOCTL_GET_FEATURES:

		rc = afu_ioctl_get_features(ctx,

				(struct ocxl_ioctl_features __user *) args);

		break;



	default:

		rc = -EINVAL;

	}

include/uapi/misc/ocxl.h

+6 −0
Original line number Diff line number Diff line
@@ -55,6 +55,11 @@ struct ocxl_ioctl_p9_wait { 
	__u64 reserved3[3];

};



#define OCXL_IOCTL_FEATURES_FLAGS0_P9_WAIT	0x01

struct ocxl_ioctl_features {

	__u64 flags[4];

};



struct ocxl_ioctl_irq_fd {

	__u64 irq_offset;

	__s32 eventfd;
@@ -70,5 +75,6 @@ struct ocxl_ioctl_irq_fd { 
#define OCXL_IOCTL_IRQ_SET_FD	_IOW(OCXL_MAGIC, 0x13, struct ocxl_ioctl_irq_fd)

#define OCXL_IOCTL_GET_METADATA _IOR(OCXL_MAGIC, 0x14, struct ocxl_ioctl_metadata)

#define OCXL_IOCTL_ENABLE_P9_WAIT	_IOR(OCXL_MAGIC, 0x15, struct ocxl_ioctl_p9_wait)

#define OCXL_IOCTL_GET_FEATURES _IOR(OCXL_MAGIC, 0x16, struct ocxl_ioctl_features)



#endif /* _UAPI_MISC_OCXL_H */