From patchwork Wed Nov 25 17:20:36 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 11931925 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 72068C83011 for ; Wed, 25 Nov 2020 17:25:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3658B2065E for ; Wed, 25 Nov 2020 17:25:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732633AbgKYRYv (ORCPT ); Wed, 25 Nov 2020 12:24:51 -0500 Received: from szxga05-in.huawei.com ([45.249.212.191]:8038 "EHLO szxga05-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730293AbgKYRYv (ORCPT ); Wed, 25 Nov 2020 12:24:51 -0500 Received: from DGGEMS404-HUB.china.huawei.com (unknown [172.30.72.58]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4Ch76f5PP0zhcqL; Thu, 26 Nov 2020 01:24:26 +0800 (CST) Received: from localhost.localdomain (10.69.192.58) by DGGEMS404-HUB.china.huawei.com (10.3.19.204) with Microsoft SMTP Server id 14.3.487.0; Thu, 26 Nov 2020 01:24:37 +0800 From: John Garry To: , , , , , CC: , , , , , "John Garry" Subject: [PATCH v3 0/5] Support managed interrupts for platform devices Date: Thu, 26 Nov 2020 01:20:36 +0800 Message-ID: <1606324841-217570-1-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 2.8.1 MIME-Version: 1.0 X-Originating-IP: [10.69.192.58] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org So far, managed interrupts are only used for PCI MSIs. This series adds platform device support for managed interrupts. Initially this topic was discussed at [0]. The method to enable managed interrupts is to allocate a group of IRQs for the device, and then switch the interrupts to managed - this is done through new function irq_update_affinity_desc(). Function devm_platform_get_irqs_affinity() is added as a helper to manage this work, such that we don't need to export irq_update_affinity_desc() or irq_create_affinity_masks(). In the devm_platform_get_irqs_affinity() release call a new platform method is used to "put" an irq. The reason for this is that per-irq mapping (and irq_desc) needs to be recreated anew for re-probing the LLDD, such that we don't attempt to reconfigure the managed or any other flag for an irq_desc. For now, the HiSilicon SAS v2 hw driver is switched over. This is used in the D05 dev board. Performance gain observed for 6x SAS SSDs is ~357K -> 420K IOPs for fio read. [0] https://lore.kernel.org/lkml/84a9411b-4ae3-1928-3d35-1666f2687ec8@huawei.com/ Changes since v2: - Update genirq change as follows: - Handle when the irq is started, active, or already managed - Reject update when CONFIG_GENERIC_IRQ_RESERVATION_MODE is set - Revamp platform.c API as follows: - Make it devm type - Add platform_put_irq() and associated change in ACPI code to allow irq resource to be reset - Unmap irqs for driver removal - Change API to accept min and max vectors John Garry (5): genirq/affinity: Add irq_update_affinity_desc() ACPI: Make acpi_dev_irqresource_disabled() public driver core: platform: Add platform_put_irq() Driver core: platform: Add devm_platform_get_irqs_affinity() scsi: hisi_sas: Expose HW queues for v2 hw drivers/acpi/resource.c | 2 +- drivers/base/platform.c | 126 +++++++++++++++++++++++++ drivers/scsi/hisi_sas/hisi_sas.h | 4 + drivers/scsi/hisi_sas/hisi_sas_main.c | 11 +++ drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 68 ++++++++++--- include/linux/acpi.h | 5 + include/linux/interrupt.h | 8 ++ include/linux/platform_device.h | 6 ++ kernel/irq/manage.c | 63 +++++++++++++ 9 files changed, 279 insertions(+), 14 deletions(-)