From patchwork Tue Nov 13 08:28:17 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexey Kardashevskiy X-Patchwork-Id: 996922 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=kvm-ppc-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=ozlabs.ru Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 42vLQF63Xvz9sNG for ; Tue, 13 Nov 2018 19:29:25 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731350AbeKMS00 (ORCPT ); Tue, 13 Nov 2018 13:26:26 -0500 Received: from 107-173-13-209-host.colocrossing.com ([107.173.13.209]:52432 "EHLO ozlabs.ru" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1731317AbeKMS00 (ORCPT ); Tue, 13 Nov 2018 13:26:26 -0500 Received: from fstn1-p1.ozlabs.ibm.com (localhost [IPv6:::1]) by ozlabs.ru (Postfix) with ESMTP id CBD54AE8030F; Tue, 13 Nov 2018 03:29:21 -0500 (EST) From: Alexey Kardashevskiy To: linuxppc-dev@lists.ozlabs.org Cc: Alexey Kardashevskiy , David Gibson , kvm-ppc@vger.kernel.org, Alistair Popple , Reza Arbab , Sam Bobroff , Piotr Jaroszynski , =?utf-8?q?Leonardo_Augusto_Guimar=C3=A3es_?= =?utf-8?q?Garcia?= , Jose Ricardo Ziviani , "Oliver O'Halloran" , Alex Williamson , Andrew Donnellan , Balbir Singh , Russell Currey Subject: [PATCH kernel v3 16/22] powerpc/powernv: Add purge cache OPAL call Date: Tue, 13 Nov 2018 19:28:17 +1100 Message-Id: <20181113082823.2440-17-aik@ozlabs.ru> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181113082823.2440-1-aik@ozlabs.ru> References: <20181113082823.2440-1-aik@ozlabs.ru> Sender: kvm-ppc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org Flushing caches using the dcbf instruction takes quite some time if we need to flush gigabytes (16GB takes more than 15s); OPAL just added a big hammer to flush all caches. This adds opal_purge_cache() which will be used later to flush caches for coherent GPU memory which might suddenly become unavailable if a GPU is reset and NVLink is not (re)trained. Signed-off-by: Alexey Kardashevskiy Reviewed-by: David Gibson --- arch/powerpc/include/asm/opal-api.h | 3 ++- arch/powerpc/include/asm/opal.h | 1 + arch/powerpc/platforms/powernv/opal.c | 1 + arch/powerpc/platforms/powernv/opal-wrappers.S | 1 + 4 files changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h index 870fb7b..55bc640 100644 --- a/arch/powerpc/include/asm/opal-api.h +++ b/arch/powerpc/include/asm/opal-api.h @@ -210,7 +210,8 @@ #define OPAL_PCI_GET_PBCQ_TUNNEL_BAR 164 #define OPAL_PCI_SET_PBCQ_TUNNEL_BAR 165 #define OPAL_NX_COPROC_INIT 167 -#define OPAL_LAST 167 +#define OPAL_CLEAR_CACHE 170 +#define OPAL_LAST 170 #define QUIESCE_HOLD 1 /* Spin all calls at entry */ #define QUIESCE_REJECT 2 /* Fail all calls with OPAL_BUSY */ diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h index ff38664..7db576e 100644 --- a/arch/powerpc/include/asm/opal.h +++ b/arch/powerpc/include/asm/opal.h @@ -294,6 +294,7 @@ int opal_set_power_shift_ratio(u32 handle, int token, u32 psr); int opal_sensor_group_clear(u32 group_hndl, int token); int opal_sensor_group_enable(u32 group_hndl, int token, bool enable); int opal_nx_coproc_init(uint32_t chip_id, uint32_t ct); +int opal_purge_cache(void); s64 opal_signal_system_reset(s32 cpu); s64 opal_quiesce(u64 shutdown_type, s32 cpu); diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c index beed86f..44ce824 100644 --- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -1113,3 +1113,4 @@ EXPORT_SYMBOL_GPL(opal_int_eoi); EXPORT_SYMBOL_GPL(opal_error_code); /* Export the below symbol for NX compression */ EXPORT_SYMBOL(opal_nx_coproc_init); +EXPORT_SYMBOL(opal_purge_cache); diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S index 2515282..5b886a6 100644 --- a/arch/powerpc/platforms/powernv/opal-wrappers.S +++ b/arch/powerpc/platforms/powernv/opal-wrappers.S @@ -331,3 +331,4 @@ OPAL_CALL(opal_pci_set_pbcq_tunnel_bar, OPAL_PCI_SET_PBCQ_TUNNEL_BAR); OPAL_CALL(opal_sensor_read_u64, OPAL_SENSOR_READ_U64); OPAL_CALL(opal_sensor_group_enable, OPAL_SENSOR_GROUP_ENABLE); OPAL_CALL(opal_nx_coproc_init, OPAL_NX_COPROC_INIT); +OPAL_CALL(opal_purge_cache, OPAL_CLEAR_CACHE);