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hw/cxl: Support aborting background commands

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As of 3.1 spec, background commands can be canceled with a new
abort command. Implement the support, which is advertised in
the CEL. No ad-hoc context undoing is necessary as all the
command logic of the running bg command is done upon completion.
Arbitrarily, the on-going background cmd will not be aborted if
already at least 85% done;

A mutex is introduced to stabilize mbox request cancel command vs
the timer callback being fired scenarios (as well as reading the
mbox registers). While some operations under critical regions
may be unnecessary (irq notifying, cmd callbacks), this is not
a path where performance is important, so simplicity is preferred.

Tested-by: Ajay Joshi <ajay.opensrc@micron.com>
Reviewed-by: Ajay Joshi <ajay.opensrc@micron.com>
Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20250305092501.191929-2-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Davidlohr Bueso 2025-03-05 09:24:52 +00:00 • committed by Michael S. Tsirkin
parent 7be29f2f1a
commit 98cbac128f
5 changed files with 86 additions and 13 deletions
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14
hw/cxl/cxl-device-utils.c
View file

@ -95,11 +95,15 @@ static uint64_t mailbox_reg_read(void *opaque, hwaddr offset, unsigned size)
}
if (offset == A_CXL_DEV_MAILBOX_STS) {
uint64_t status_reg = cxl_dstate->mbox_reg_state64[offset / size];
if (cci->bg.complete_pct) {
status_reg = FIELD_DP64(status_reg, CXL_DEV_MAILBOX_STS, BG_OP,
0);
cxl_dstate->mbox_reg_state64[offset / size] = status_reg;
}
int bgop;
qemu_mutex_lock(&cci->bg.lock);
bgop = !(cci->bg.complete_pct == 100 || cci->bg.aborted);
status_reg = FIELD_DP64(status_reg, CXL_DEV_MAILBOX_STS, BG_OP,
bgop);
cxl_dstate->mbox_reg_state64[offset / size] = status_reg;
qemu_mutex_unlock(&cci->bg.lock);
}
return cxl_dstate->mbox_reg_state64[offset / size];
default: