From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from VA3EHSOBE010.bigfish.com (va3ehsobe010.messaging.microsoft.com [216.32.180.30]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (Client CN "mail.global.frontbridge.com", Issuer "Microsoft Secure Server Authority" (not verified)) by ozlabs.org (Postfix) with ESMTPS id 1E0E4B6FA7 for ; Tue, 21 Feb 2012 15:51:20 +1100 (EST) From: Liu Yu To: , , Subject: [PATCH v5 3/4] KVM: PPC: epapr: install ev_idle hcall for e500 guest Date: Tue, 21 Feb 2012 12:46:12 +0800 Message-ID: <1329799573-8820-3-git-send-email-yu.liu@freescale.com> In-Reply-To: <1329799573-8820-2-git-send-email-yu.liu@freescale.com> References: <1329799573-8820-1-git-send-email-yu.liu@freescale.com> <1329799573-8820-2-git-send-email-yu.liu@freescale.com> MIME-Version: 1.0 Content-Type: text/plain Cc: linuxppc-dev@ozlabs.org, Liu Yu , B07421@freescale.com List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , If the guest hypervisor node contains "has-idle" property. Signed-off-by: Liu Yu --- v5: no change arch/powerpc/kernel/epapr_hcalls.S | 29 +++++++++++++++++++++++++++++ arch/powerpc/kernel/epapr_paravirt.c | 11 ++++++++++- 2 files changed, 39 insertions(+), 1 deletions(-) diff --git a/arch/powerpc/kernel/epapr_hcalls.S b/arch/powerpc/kernel/epapr_hcalls.S index 697b390..72fa234 100644 --- a/arch/powerpc/kernel/epapr_hcalls.S +++ b/arch/powerpc/kernel/epapr_hcalls.S @@ -15,6 +15,35 @@ #include #include +#define HC_VENDOR_EPAPR (1 << 16) +#define HC_EV_IDLE 16 + +_GLOBAL(epapr_ev_idle) +epapr_ev_idle: + rlwinm r3,r1,0,0,31-THREAD_SHIFT /* current thread_info */ + lwz r4,TI_LOCAL_FLAGS(r3) /* set napping bit */ + ori r4,r4,_TLF_NAPPING /* so when we take an exception */ + stw r4,TI_LOCAL_FLAGS(r3) /* it will return to our caller */ + + wrteei 1 + +idle_loop: + LOAD_REG_IMMEDIATE(r11, HC_VENDOR_EPAPR | HC_EV_IDLE) + +.global epapr_ev_idle_start +epapr_ev_idle_start: + li r3, -1 + nop + nop + nop + + /* + * Guard against spurious wakeups from a hypervisor -- + * only interrupt will cause us to return to LR due to + * _TLF_NAPPING. + */ + b idle_loop + /* Hypercall entry point. Will be patched with device tree instructions. */ .global epapr_hypercall_start epapr_hypercall_start: diff --git a/arch/powerpc/kernel/epapr_paravirt.c b/arch/powerpc/kernel/epapr_paravirt.c index e601da7..43d875e 100644 --- a/arch/powerpc/kernel/epapr_paravirt.c +++ b/arch/powerpc/kernel/epapr_paravirt.c @@ -21,6 +21,10 @@ #include #include #include +#include + +extern void epapr_ev_idle(void); +extern u32 epapr_ev_idle_start[]; bool epapr_para_enabled = false; @@ -39,8 +43,13 @@ static int __init epapr_para_init(void) insts = of_get_property(hyper_node, "hcall-instructions", &len); if (insts && !(len % 4) && len <= (4 * 4)) { - for (i = 0; i < (len / 4); i++) + for (i = 0; i < (len / 4); i++) { patch_instruction(epapr_hypercall_start + i, insts[i]); + patch_instruction(epapr_ev_idle_start + i, insts[i]); + } + + if (of_get_property(hyper_node, "has-idle", NULL)) + ppc_md.power_save = epapr_ev_idle; epapr_para_enabled = true; } else { -- 1.7.0.4