From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (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 3sz29k4XzJzDvHN for ; Wed, 19 Oct 2016 04:28:58 +1100 (AEDT) Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id u9IHOeTQ113647 for ; Tue, 18 Oct 2016 13:28:57 -0400 Received: from e32.co.us.ibm.com (e32.co.us.ibm.com [32.97.110.150]) by mx0a-001b2d01.pphosted.com with ESMTP id 265p26pfsc-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 18 Oct 2016 13:28:56 -0400 Received: from localhost by e32.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 18 Oct 2016 11:28:55 -0600 Subject: [PATCH v6 3/3] powerpc/pseries: Implement indexed-count hotplug memory remove To: linuxppc-dev@lists.ozlabs.org From: Nathan Fontenot Cc: sahilmehta17@gmail.com Date: Tue, 18 Oct 2016 13:21:06 -0400 In-Reply-To: <20161018171803.37287.54834.stgit@ltcalpine2-lp14.aus.stglabs.ibm.com> References: <20161018171803.37287.54834.stgit@ltcalpine2-lp14.aus.stglabs.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Message-Id: <20161018172053.37287.78128.stgit@ltcalpine2-lp14.aus.stglabs.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Sahil Mehta Indexed-count remove for memory hotplug guarantees that a contiguous block of lmbs beginning at a specified will be unassigned (NOT that lmbs will be removed). Because of Qemu's per-DIMM memory management, the removal of a contiguous block of memory currently requires a series of individual calls. Indexed-count remove reduces this series into a single call. Signed-off-by: Sahil Mehta Signed-off-by: Nathan Fontenot --- v2: -use u32s drc_index and count instead of u32 ic[] in dlpar_memory v3: -add logic to handle invalid drc_index input v4: -none v5: -Update for() loop to start at start_index v6: -none arch/powerpc/platforms/pseries/hotplug-memory.c | 90 +++++++++++++++++++++++ 1 file changed, 90 insertions(+) diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c index badc66d..19ad081 100644 --- a/arch/powerpc/platforms/pseries/hotplug-memory.c +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c @@ -558,6 +558,92 @@ static int dlpar_memory_remove_by_index(u32 drc_index, struct property *prop) return rc; } +static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index, + struct property *prop) +{ + struct of_drconf_cell *lmbs; + u32 num_lmbs, *p; + int i, rc, start_lmb_found; + int lmbs_available = 0, start_index = 0, end_index; + + pr_info("Attempting to hot-remove %u LMB(s) at %x\n", + lmbs_to_remove, drc_index); + + if (lmbs_to_remove == 0) + return -EINVAL; + + p = prop->value; + num_lmbs = *p++; + lmbs = (struct of_drconf_cell *)p; + start_lmb_found = 0; + + /* Navigate to drc_index */ + while (start_index < num_lmbs) { + if (lmbs[start_index].drc_index == drc_index) { + start_lmb_found = 1; + break; + } + + start_index++; + } + + if (!start_lmb_found) + return -EINVAL; + + end_index = start_index + lmbs_to_remove; + + /* Validate that there are enough LMBs to satisfy the request */ + for (i = start_index; i < end_index; i++) { + if (lmbs[i].flags & DRCONF_MEM_RESERVED) + break; + + lmbs_available++; + } + + if (lmbs_available < lmbs_to_remove) + return -EINVAL; + + for (i = start_index; i < end_index; i++) { + if (!(lmbs[i].flags & DRCONF_MEM_ASSIGNED)) + continue; + + rc = dlpar_remove_lmb(&lmbs[i]); + if (rc) + break; + + lmbs[i].reserved = 1; + } + + if (rc) { + pr_err("Memory indexed-count-remove failed, adding any removed LMBs\n"); + + for (i = start_index; i < end_index; i++) { + if (!lmbs[i].reserved) + continue; + + rc = dlpar_add_lmb(&lmbs[i]); + if (rc) + pr_err("Failed to add LMB, drc index %x\n", + be32_to_cpu(lmbs[i].drc_index)); + + lmbs[i].reserved = 0; + } + rc = -EINVAL; + } else { + for (i = start_index; i < end_index; i++) { + if (!lmbs[i].reserved) + continue; + + pr_info("Memory at %llx (drc index %x) was hot-removed\n", + lmbs[i].base_addr, lmbs[i].drc_index); + + lmbs[i].reserved = 0; + } + } + + return rc; +} + #else static inline int pseries_remove_memblock(unsigned long base, unsigned int memblock_size) @@ -853,6 +939,10 @@ int dlpar_memory(struct pseries_hp_errorlog *hp_elog) } else if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_INDEX) { drc_index = hp_elog->_drc_u.drc_index; rc = dlpar_memory_remove_by_index(drc_index, prop); + } else if (hp_elog->id_type == PSERIES_HP_ELOG_ID_DRC_IC) { + count = hp_elog->_drc_u.indexed_count[0]; + drc_index = hp_elog->_drc_u.indexed_count[1]; + rc = dlpar_memory_remove_by_ic(count, drc_index, prop); } else { rc = -EINVAL; }