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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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15
drivers/misc/cxl/file.c
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@@ -173,7 +173,7 @@ static long afu_ioctl_start_work(struct cxl_context *ctx,
* flags are set it's invalid
*/
if (work.reserved1 || work.reserved2 || work.reserved3 ||
work.reserved4 || work.reserved5 || work.reserved6 ||
work.reserved4 || work.reserved5 ||
(work.flags & ~CXL_START_WORK_ALL)) {
rc = -EINVAL;
goto out;
@@ -186,12 +186,16 @@ static long afu_ioctl_start_work(struct cxl_context *ctx,
rc = -EINVAL;
goto out;
}
if ((rc = afu_register_irqs(ctx, work.num_interrupts)))
goto out;
if (work.flags & CXL_START_WORK_AMR)
amr = work.amr & mfspr(SPRN_UAMOR);
if (work.flags & CXL_START_WORK_TID)
ctx->assign_tidr = true;
ctx->mmio_err_ff = !!(work.flags & CXL_START_WORK_ERR_FF);
/*
@@ -263,8 +267,15 @@ static long afu_ioctl_start_work(struct cxl_context *ctx,
goto out;
}
ctx->status = STARTED;
rc = 0;
if (work.flags & CXL_START_WORK_TID) {
work.tid = ctx->tidr;
if (copy_to_user(uwork, &work, sizeof(work)))
rc = -EFAULT;
}
ctx->status = STARTED;
out:
mutex_unlock(&ctx->status_mutex);
return rc;