From patchwork Fri Dec 9 00:07:37 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Gibson X-Patchwork-Id: 704273 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3tZXhB6xSzz9tlB for ; Fri, 9 Dec 2016 11:11:06 +1100 (AEDT) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=gibson.dropbear.id.au header.i=@gibson.dropbear.id.au header.b="hWcgX/rq"; dkim-atps=neutral Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 3tZXhB5yMkzDw7j for ; Fri, 9 Dec 2016 11:11:06 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=gibson.dropbear.id.au header.i=@gibson.dropbear.id.au header.b="hWcgX/rq"; dkim-atps=neutral X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from ozlabs.org (ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3tZXcK0h07zDw6M for ; Fri, 9 Dec 2016 11:07:45 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=gibson.dropbear.id.au header.i=@gibson.dropbear.id.au header.b="hWcgX/rq"; dkim-atps=neutral Received: by ozlabs.org (Postfix) id 3tZXcJ3tV4z9vFK; Fri, 9 Dec 2016 11:07:44 +1100 (AEDT) Delivered-To: linuxppc-dev@ozlabs.org Received: by ozlabs.org (Postfix, from userid 1007) id 3tZXcJ2c4Sz9vDc; Fri, 9 Dec 2016 11:07:44 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gibson.dropbear.id.au; s=201602; t=1481242064; bh=EgPj7ouOHVRl9aK5m4+7hkzN5WSWYci8ktuAeRl3hrg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hWcgX/rq9tcX4ToDh7Z+UL+PbmmzV9F/VdMtFBelmiDYw4v/BUjqWeg8ZSaAsXjd9 bFZ/IA3+Ff2ECM/ps4XwQjOWvT4LW9Bbt/VxBJSc7eWLyTeKmC30Yvef7tMda4E3TF v5xIpvLrGIXR9NPXaW7bD+JeP7JLiOZ8WDu5MWYY= From: David Gibson To: michael@ellerman.id.au, paulus@samba.org Subject: [PATCHv2 3/4] pseries: Advertise HPT resizing support via CAS Date: Fri, 9 Dec 2016 11:07:37 +1100 Message-Id: <20161209000738.8984-4-david@gibson.dropbear.id.au> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20161209000738.8984-1-david@gibson.dropbear.id.au> References: <20161209000738.8984-1-david@gibson.dropbear.id.au> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@ozlabs.org, David Gibson Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" The hypervisor needs to know a guest is capable of using the HPT resizing PAPR extension in order to make full advantage of it for memory hotplug. If the hypervisor knows the guest is HPT resize aware, it can size the initial HPT based on the initial guest RAM size, relying on the guest to resize the HPT when more memory is hot-added. Without this, the hypervisor must size the HPT for the maximum possible guest RAM, which can lead to a huge waste of space if the guest never actually expends to that maximum size. This patch advertises the guest's support for HPT resizing via the ibm,client-architecture-support OF interface. We use bit 5 of byte 6 of option vector 5 for this purpose (tentatively assigned in in-progress PAPR change request). Signed-off-by: David Gibson Reviewed-by: Anshuman Khandual Reviewed-by: Paul Mackerras --- arch/powerpc/include/asm/prom.h | 1 + arch/powerpc/kernel/prom_init.c | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/prom.h b/arch/powerpc/include/asm/prom.h index 7f436ba..94c92bb 100644 --- a/arch/powerpc/include/asm/prom.h +++ b/arch/powerpc/include/asm/prom.h @@ -151,6 +151,7 @@ struct of_drconf_cell { #define OV5_XCMO 0x0440 /* Page Coalescing */ #define OV5_TYPE1_AFFINITY 0x0580 /* Type 1 NUMA affinity */ #define OV5_PRRN 0x0540 /* Platform Resource Reassignment */ +#define OV5_RESIZE_HPT 0x0601 /* Hash Page Table resizing */ #define OV5_PFO_HW_RNG 0x0E80 /* PFO Random Number Generator */ #define OV5_PFO_HW_842 0x0E40 /* PFO Compression Accelerator */ #define OV5_PFO_HW_ENCR 0x0E20 /* PFO Encryption Accelerator */ diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c index 88ac964..9942d9f 100644 --- a/arch/powerpc/kernel/prom_init.c +++ b/arch/powerpc/kernel/prom_init.c @@ -713,7 +713,7 @@ unsigned char ibm_architecture_vec[] = { 0, #endif OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN), - 0, + OV5_FEAT(OV5_RESIZE_HPT), 0, 0, /* WARNING: The offset of the "number of cores" field below