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ppc/xive: Provide silent escalation support 

When the 's' bit is set the escalation is said to be 'silent' or
'silent/gather'. In such configuration, the notification sequence is
skipped and only the escalation sequence is performed. This is used to
configure all the EQs of a vCPU to escalate on a single EQ which will
then target the hypervisor.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20190718115420.19919-8-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Cédric Le Goater 2019-07-18 13:54:10 +02:00 committed by David Gibson
parent 53e934921d
commit ad31e2d242
2 changed files with 10 additions and 0 deletions
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8
hw/intc/xive.c
View File

@ -1485,6 +1485,13 @@ static void xive_router_end_notify(XiveRouter *xrtr, uint8_t end_blk,
xive_router_write_end(xrtr, end_blk, end_idx, &end, 1);
}
/*
* When the END is silent, we skip the notification part.
*/
if (xive_end_is_silent_escalation(&end)) {
goto do_escalation;
}
/*
* The W7 format depends on the F bit in W6. It defines the type
* of the notification :
@ -1564,6 +1571,7 @@ static void xive_router_end_notify(XiveRouter *xrtr, uint8_t end_blk,
*/
}
do_escalation:
/*
* If activated, escalate notification using the ESe PQ bits and
* the EAS in w4-5

2
include/hw/ppc/xive_regs.h
View File

@ -212,6 +212,8 @@ typedef struct XiveEND {
#define xive_end_is_escalate(end) (be32_to_cpu((end)->w0) & END_W0_ESCALATE_CTL)
#define xive_end_is_uncond_escalation(end) \
(be32_to_cpu((end)->w0) & END_W0_UNCOND_ESCALATE)
#define xive_end_is_silent_escalation(end) \
(be32_to_cpu((end)->w0) & END_W0_SILENT_ESCALATE)
static inline uint64_t xive_end_qaddr(XiveEND *end)
{