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ppc/xive: Provide backlog support

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If backlog is activated ('b' bit) on the END, the pending priority of
a missed event is recorded in the IPB field of the NVT for a later
resend.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20190718115420.19919-5-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Cédric Le Goater 2019-07-18 13:54:07 +02:00 committed by David Gibson
parent d98ec603c6
commit 52c5acf04e
1 changed files with 48 additions and 29 deletions
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77
hw/intc/xive.c
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@ -1411,46 +1411,22 @@ static bool xive_presenter_match(XiveRouter *xrtr, uint8_t format,
*
* The parameters represent what is sent on the PowerBus
*/
static void xive_presenter_notify(XiveRouter *xrtr, uint8_t format,
static bool xive_presenter_notify(XiveRouter *xrtr, uint8_t format,
uint8_t nvt_blk, uint32_t nvt_idx,
bool cam_ignore, uint8_t priority,
uint32_t logic_serv)
{
XiveNVT nvt;
XiveTCTXMatch match = { .tctx = NULL, .ring = 0 };
bool found;
/* NVT cache lookup */
if (xive_router_get_nvt(xrtr, nvt_blk, nvt_idx, &nvt)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: no NVT %x/%x\n",
nvt_blk, nvt_idx);
return;
}
if (!xive_nvt_is_valid(&nvt)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: NVT %x/%x is invalid\n",
nvt_blk, nvt_idx);
return;
}
found = xive_presenter_match(xrtr, format, nvt_blk, nvt_idx, cam_ignore,
priority, logic_serv, &match);
if (found) {
ipb_update(&match.tctx->regs[match.ring], priority);
xive_tctx_notify(match.tctx, match.ring);
return;
}
/* Record the IPB in the associated NVT structure */
ipb_update((uint8_t *) &nvt.w4, priority);
xive_router_write_nvt(xrtr, nvt_blk, nvt_idx, &nvt, 4);
/*
* If no matching NVT is dispatched on a HW thread :
* - update the NVT structure if backlog is activated
* - escalate (ESe PQ bits and EAS in w4-5) if escalation is
* activated
*/
return found;
}
/*
@ -1464,6 +1440,10 @@ static void xive_router_end_notify(XiveRouter *xrtr, uint8_t end_blk,
XiveEND end;
uint8_t priority;
uint8_t format;
uint8_t nvt_blk;
uint32_t nvt_idx;
XiveNVT nvt;
bool found;
/* END cache lookup */
if (xive_router_get_end(xrtr, end_blk, end_idx, &end)) {
@ -1522,14 +1502,53 @@ static void xive_router_end_notify(XiveRouter *xrtr, uint8_t end_blk,
/*
* Follows IVPE notification
*/
xive_presenter_notify(xrtr, format,
xive_get_field32(END_W6_NVT_BLOCK, end.w6),
xive_get_field32(END_W6_NVT_INDEX, end.w6),
nvt_blk = xive_get_field32(END_W6_NVT_BLOCK, end.w6);
nvt_idx = xive_get_field32(END_W6_NVT_INDEX, end.w6);
/* NVT cache lookup */
if (xive_router_get_nvt(xrtr, nvt_blk, nvt_idx, &nvt)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: no NVT %x/%x\n",
nvt_blk, nvt_idx);
return;
}
if (!xive_nvt_is_valid(&nvt)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: NVT %x/%x is invalid\n",
nvt_blk, nvt_idx);
return;
}
found = xive_presenter_notify(xrtr, format, nvt_blk, nvt_idx,
xive_get_field32(END_W7_F0_IGNORE, end.w7),
priority,
xive_get_field32(END_W7_F1_LOG_SERVER_ID, end.w7));
/* TODO: Auto EOI. */
if (found) {
return;
}
/*
* If no matching NVT is dispatched on a HW thread :
* - specific VP: update the NVT structure if backlog is activated
* - logical server : forward request to IVPE (not supported)
*/
if (xive_end_is_backlog(&end)) {
if (format == 1) {
qemu_log_mask(LOG_GUEST_ERROR,
"XIVE: END %x/%x invalid config: F1 & backlog\n",
end_blk, end_idx);
return;
}
/* Record the IPB in the associated NVT structure */
ipb_update((uint8_t *) &nvt.w4, priority);
xive_router_write_nvt(xrtr, nvt_blk, nvt_idx, &nvt, 4);
/*
* On HW, follows a "Broadcast Backlog" to IVPEs
*/
}
}
void xive_router_notify(XiveNotifier *xn, uint32_t lisn)