From patchwork Wed Dec 19 08:52:18 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexey Kardashevskiy X-Patchwork-Id: 1015923 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 43KTPm1PTZz9s6w for ; Wed, 19 Dec 2018 20:00:44 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728574AbeLSJA0 (ORCPT ); Wed, 19 Dec 2018 04:00:26 -0500 Received: from ozlabs.ru ([107.173.13.209]:42670 "EHLO ozlabs.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728570AbeLSJA0 (ORCPT ); Wed, 19 Dec 2018 04:00:26 -0500 Received: from fstn1-p1.ozlabs.ibm.com (localhost [IPv6:::1]) by ozlabs.ru (Postfix) with ESMTP id 11766AE80337; Wed, 19 Dec 2018 03:52:53 -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 , Daniel Henrique Barboza , Alex Williamson , Paul Mackerras Subject: [PATCH kernel v6 06/20] powerpc/pseries/iommu: Use memory@ nodes in max RAM address calculation Date: Wed, 19 Dec 2018 19:52:18 +1100 Message-Id: <20181219085232.103441-7-aik@ozlabs.ru> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181219085232.103441-1-aik@ozlabs.ru> References: <20181219085232.103441-1-aik@ozlabs.ru> Sender: kvm-ppc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org We might have memory@ nodes with "linux,usable-memory" set to zero (for example, to replicate powernv's behaviour for GPU coherent memory) which means that the memory needs an extra initialization but since it can be used afterwards, the pseries platform will try mapping it for DMA so the DMA window needs to cover those memory regions too; if the window cannot cover new memory regions, the memory onlining fails. This walks through the memory nodes to find the highest RAM address to let a huge DMA window cover that too in case this memory gets onlined later. Signed-off-by: Alexey Kardashevskiy --- Changes: v4: * uses of_read_number directly instead of cut-n-pasted read_n_cells --- arch/powerpc/platforms/pseries/iommu.c | 33 +++++++++++++++++++++++++- 1 file changed, 32 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c index 06f0296..cbcc8ce 100644 --- a/arch/powerpc/platforms/pseries/iommu.c +++ b/arch/powerpc/platforms/pseries/iommu.c @@ -964,6 +964,37 @@ struct failed_ddw_pdn { static LIST_HEAD(failed_ddw_pdn_list); +static phys_addr_t ddw_memory_hotplug_max(void) +{ + phys_addr_t max_addr = memory_hotplug_max(); + struct device_node *memory; + + for_each_node_by_type(memory, "memory") { + unsigned long start, size; + int ranges, n_mem_addr_cells, n_mem_size_cells, len; + const __be32 *memcell_buf; + + memcell_buf = of_get_property(memory, "reg", &len); + if (!memcell_buf || len <= 0) + continue; + + n_mem_addr_cells = of_n_addr_cells(memory); + n_mem_size_cells = of_n_size_cells(memory); + + /* ranges in cell */ + ranges = (len >> 2) / (n_mem_addr_cells + n_mem_size_cells); + + start = of_read_number(memcell_buf, n_mem_addr_cells); + memcell_buf += n_mem_addr_cells; + size = of_read_number(memcell_buf, n_mem_size_cells); + memcell_buf += n_mem_size_cells; + + max_addr = max_t(phys_addr_t, max_addr, start + size); + } + + return max_addr; +} + /* * If the PE supports dynamic dma windows, and there is space for a table * that can map all pages in a linear offset, then setup such a table, @@ -1053,7 +1084,7 @@ static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn) } /* verify the window * number of ptes will map the partition */ /* check largest block * page size > max memory hotplug addr */ - max_addr = memory_hotplug_max(); + max_addr = ddw_memory_hotplug_max(); if (query.largest_available_block < (max_addr >> page_shift)) { dev_dbg(&dev->dev, "can't map partition max 0x%llx with %u " "%llu-sized pages\n", max_addr, query.largest_available_block,