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cxl: Add support for ASB_Notify on POWER9

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The POWER9 core supports a new feature: ASB_Notify which requires the
support of the Special Purpose Register: TIDR.

The ASB_Notify command, generated by the AFU, will attempt to
wake-up the host thread identified by the particular LPID:PID:TID.

This patch assign a unique TIDR (thread id) for the current thread which
will be used in the process element entry.

Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Reviewed-by: Philippe Bergheaud <felix@linux.vnet.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Reviewed-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Lombard
2018-01-11 09:55:25 +01:00
committed by Michael Ellerman
parent 074db39e00
commit b1db551324
7 changed files with 39 additions and 8 deletions
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include/uapi/misc/cxl.h
+6 -4
View File
@@ -20,20 +20,22 @@ struct cxl_ioctl_start_work {
__u64 work_element_descriptor;
__u64 amr;
__s16 num_interrupts;
__s16 reserved1;
__s32 reserved2;
__u16 tid;
__s32 reserved1;
__u64 reserved2;
__u64 reserved3;
__u64 reserved4;
__u64 reserved5;
__u64 reserved6;
};
#define CXL_START_WORK_AMR 0x0000000000000001ULL
#define CXL_START_WORK_NUM_IRQS 0x0000000000000002ULL
#define CXL_START_WORK_ERR_FF 0x0000000000000004ULL
#define CXL_START_WORK_TID 0x0000000000000008ULL
#define CXL_START_WORK_ALL (CXL_START_WORK_AMR |\
CXL_START_WORK_NUM_IRQS |\
CXL_START_WORK_ERR_FF)
CXL_START_WORK_ERR_FF |\
CXL_START_WORK_TID)
/* Possible modes that an afu can be in */