From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3wtcgl6bwBzDr1n for ; Thu, 22 Jun 2017 20:06:59 +1000 (AEST) Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v5MA3jt2104307 for ; Thu, 22 Jun 2017 06:06:57 -0400 Received: from e06smtp10.uk.ibm.com (e06smtp10.uk.ibm.com [195.75.94.106]) by mx0a-001b2d01.pphosted.com with ESMTP id 2b8bsr04ub-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 22 Jun 2017 06:06:56 -0400 Received: from localhost by e06smtp10.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 22 Jun 2017 11:06:55 +0100 From: Frederic Barrat To: mpe@ellerman.id.au, aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com, linuxppc-dev@lists.ozlabs.org Cc: clombard@linux.vnet.ibm.com Subject: [RFC v2 0/3] powerpc/mm: Mark memory contexts requiring global TLBIs Date: Thu, 22 Jun 2017 12:06:46 +0200 Message-Id: <20170622100649.3846-1-fbarrat@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , capi2 and opencapi require the TLB invalidations being sent for addresses used on the cxl adapter or opencapi device to be global, as there's a translation cache in the PSL (for capi2) or NPU (for opencapi). The CAPP (for PSL) and NPU snoop the power bus. This is not new: for the hash memory model, as soon as the cxl driver is active, all local TLBIs become global. We need a similar mechanism for the radix memory model. This patch tries to improve things a bit by flagging the contexts requiring global TLBIs, therefore limiting the "upgrade" and not affecting contexts not used by the card. A longer-term goal is to modify the current implementation for hash to follow the same direction, i.e. identify contexts needing global TLBIs, but that will be for later. It would be required to support hash for opencapi. Changelog: >>From previous comments: - rename MM_CONTEXT_GLOBAL_TLBI -> MM_GLOBAL_TLBIE - add memory barriers to make sure the device doesn't miss any TLBI - also add barrier for the hash implemention to fix the same issue Frederic Barrat (3): powerpc/mm: Add marker for contexts requiring global TLB invalidations cxl: Mark context requiring global TLBIs cxl: Add memory barrier to guarantee TLBI scope arch/powerpc/include/asm/book3s/64/mmu.h | 18 ++++++++++++++++++ arch/powerpc/include/asm/tlb.h | 23 +++++++++++++++++++++-- arch/powerpc/mm/mmu_context_book3s64.c | 1 + drivers/misc/cxl/api.c | 12 ++++++++++-- drivers/misc/cxl/file.c | 12 ++++++++++-- include/misc/cxl-base.h | 18 +++++++++++++++++- 6 files changed, 77 insertions(+), 7 deletions(-) -- 2.11.0