From patchwork Tue Sep 8 20:10:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 11764381 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DAB33618 for ; Tue, 8 Sep 2020 20:11:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C16EC2177B for ; Tue, 8 Sep 2020 20:11:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="bYskYPYt" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730415AbgIHULD (ORCPT ); Tue, 8 Sep 2020 16:11:03 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:50195 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1731733AbgIHUKu (ORCPT ); Tue, 8 Sep 2020 16:10:50 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1599595849; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zFptVInSDSbB2nDLyh5K9NKtnygiDyhn7CU7AXmV4mo=; b=bYskYPYt9aiVUJ6gIgN0+JVAwt4I7PDsfCXfZjeLMWEZ3eEpZT2ul/+FD5mW0eCFK5xAue ++rAKM+zs6bqILol8FufMBmK3GZX0OY5fG1u46O2Cpmb3qIg8rvcNDmcPe1vh4wmzjY7x3 ROEgzp4sZ4rxFsWpypNTt7Xvx5+NjhE= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-530-LvQ5oUMCNbaDKH3Y7EmEEA-1; Tue, 08 Sep 2020 16:10:47 -0400 X-MC-Unique: LvQ5oUMCNbaDKH3Y7EmEEA-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 409D9839A48; Tue, 8 Sep 2020 20:10:42 +0000 (UTC) Received: from t480s.redhat.com (ovpn-115-46.ams2.redhat.com [10.36.115.46]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6279B5D9E8; Tue, 8 Sep 2020 20:10:35 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: virtualization@lists.linux-foundation.org, linux-mm@kvack.org, linux-hyperv@vger.kernel.org, xen-devel@lists.xenproject.org, linux-acpi@vger.kernel.org, linux-nvdimm@lists.01.org, linux-s390@vger.kernel.org, Andrew Morton , David Hildenbrand , Michal Hocko , Dan Williams , Jason Gunthorpe , Kees Cook , Ard Biesheuvel , Pankaj Gupta , Baoquan He , Wei Yang , Eric Biederman , Thomas Gleixner , Greg Kroah-Hartman , kexec@lists.infradead.org Subject: [PATCH v2 2/7] kernel/resource: move and rename IORESOURCE_MEM_DRIVER_MANAGED Date: Tue, 8 Sep 2020 22:10:07 +0200 Message-Id: <20200908201012.44168-3-david@redhat.com> In-Reply-To: <20200908201012.44168-1-david@redhat.com> References: <20200908201012.44168-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org IORESOURCE_MEM_DRIVER_MANAGED currently uses an unused PnP bit, which is always set to 0 by hardware. This is far from beautiful (and confusing), and the bit only applies to SYSRAM. So let's move it out of the bus-specific (PnP) defined bits. We'll add another SYSRAM specific bit soon. If we ever need more bits for other purposes, we can steal some from "desc", or reshuffle/regroup what we have. Cc: Andrew Morton Cc: Michal Hocko Cc: Dan Williams Cc: Jason Gunthorpe Cc: Kees Cook Cc: Ard Biesheuvel Cc: Pankaj Gupta Cc: Baoquan He Cc: Wei Yang Cc: Eric Biederman Cc: Thomas Gleixner Cc: Greg Kroah-Hartman Cc: kexec@lists.infradead.org Signed-off-by: David Hildenbrand --- include/linux/ioport.h | 4 +++- kernel/kexec_file.c | 2 +- mm/memory_hotplug.c | 4 ++-- 3 files changed, 6 insertions(+), 4 deletions(-) diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 52a91f5fa1a36..d7620d7c941a0 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -58,6 +58,9 @@ struct resource { #define IORESOURCE_EXT_TYPE_BITS 0x01000000 /* Resource extended types */ #define IORESOURCE_SYSRAM 0x01000000 /* System RAM (modifier) */ +/* IORESOURCE_SYSRAM specific bits. */ +#define IORESOURCE_SYSRAM_DRIVER_MANAGED 0x02000000 /* Always detected via a driver. */ + #define IORESOURCE_EXCLUSIVE 0x08000000 /* Userland may not map this resource */ #define IORESOURCE_DISABLED 0x10000000 @@ -103,7 +106,6 @@ struct resource { #define IORESOURCE_MEM_32BIT (3<<3) #define IORESOURCE_MEM_SHADOWABLE (1<<5) /* dup: IORESOURCE_SHADOWABLE */ #define IORESOURCE_MEM_EXPANSIONROM (1<<6) -#define IORESOURCE_MEM_DRIVER_MANAGED (1<<7) /* PnP I/O specific bits (IORESOURCE_BITS) */ #define IORESOURCE_IO_16BIT_ADDR (1<<0) diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index ca40bef75a616..dfeeed1aed084 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -520,7 +520,7 @@ static int locate_mem_hole_callback(struct resource *res, void *arg) /* Returning 0 will take to next memory range */ /* Don't use memory that will be detected and handled by a driver. */ - if (res->flags & IORESOURCE_MEM_DRIVER_MANAGED) + if (res->flags & IORESOURCE_SYSRAM_DRIVER_MANAGED) return 0; if (sz < kbuf->memsz) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 4c47b68a9f4b5..8e1cd18b5cf14 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -105,7 +105,7 @@ static struct resource *register_memory_resource(u64 start, u64 size, unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; if (strcmp(resource_name, "System RAM")) - flags |= IORESOURCE_MEM_DRIVER_MANAGED; + flags |= IORESOURCE_SYSRAM_DRIVER_MANAGED; /* * Make sure value parsed from 'mem=' only restricts memory adding @@ -1160,7 +1160,7 @@ EXPORT_SYMBOL_GPL(add_memory); * * For this memory, no entries in /sys/firmware/memmap ("raw firmware-provided * memory map") are created. Also, the created memory resource is flagged - * with IORESOURCE_MEM_DRIVER_MANAGED, so in-kernel users can special-case + * with IORESOURCE_SYSRAM_DRIVER_MANAGED, so in-kernel users can special-case * this memory as well (esp., not place kexec images onto it). * * The resource_name (visible via /proc/iomem) has to have the format