From ad31e2d242399bdaa300b940bbef253331c92ec3 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Date: Thu, 18 Jul 2019 13:54:10 +0200 Subject: ppc/xive: Provide silent escalation support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Message-Id: <20190718115420.19919-8-clg@kaod.org> Signed-off-by: David Gibson --- hw/intc/xive.c | 8 ++++++++ include/hw/ppc/xive_regs.h | 2 ++ 2 files changed, 10 insertions(+) diff --git a/hw/intc/xive.c b/hw/intc/xive.c index 3fe84f3e76..dd7d02dfdf 100644 --- a/hw/intc/xive.c +++ b/hw/intc/xive.c @@ -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 diff --git a/include/hw/ppc/xive_regs.h b/include/hw/ppc/xive_regs.h index 4378d7259c..fed019516f 100644 --- a/include/hw/ppc/xive_regs.h +++ b/include/hw/ppc/xive_regs.h @@ -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) { -- cgit v1.2.3