From patchwork Fri Mar 10 17:20:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mario Limonciello X-Patchwork-Id: 662332 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2F0BEC64EC4 for ; Fri, 10 Mar 2023 17:21:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231235AbjCJRVO (ORCPT ); Fri, 10 Mar 2023 12:21:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47954 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230456AbjCJRVK (ORCPT ); Fri, 10 Mar 2023 12:21:10 -0500 Received: from NAM02-SN1-obe.outbound.protection.outlook.com (mail-sn1nam02on20619.outbound.protection.outlook.com [IPv6:2a01:111:f400:7ea9::619]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5668910F854; 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DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Mar 2023 17:21:05.1054 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b8903eac-c44c-4688-9cea-08db218bd477 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS1PEPF0000B079.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB7650 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org `ring_interrupt_index` doesn't change the data for `ring` so mark it as const. Cc: Sanju Mehta Signed-off-by: Mario Limonciello --- drivers/thunderbolt/nhi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c index 4dce2edd86ea0..fdc0c3ba2ef01 100644 --- a/drivers/thunderbolt/nhi.c +++ b/drivers/thunderbolt/nhi.c @@ -46,7 +46,7 @@ #define QUIRK_AUTO_CLEAR_INT BIT(0) #define QUIRK_E2E BIT(1) -static int ring_interrupt_index(struct tb_ring *ring) +static int ring_interrupt_index(const struct tb_ring *ring) { int bit = ring->hop; if (!ring->is_tx) From patchwork Fri Mar 10 17:20:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mario Limonciello X-Patchwork-Id: 662072 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 536FFC64EC4 for ; Fri, 10 Mar 2023 17:21:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229845AbjCJRVW (ORCPT ); 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Fri, 10 Mar 2023 11:21:03 -0600 From: Mario Limonciello To: Andreas Noever , Michael Jamet , Mika Westerberg , Yehezkel Bernat , Basavaraj Natikar , Sanjay R Mehta CC: , Mario Limonciello , "Sanju Mehta" , , Subject: [PATCH 2/2] thunderbolt: Disable interrupt auto clear for rings Date: Fri, 10 Mar 2023 11:20:50 -0600 Message-ID: <20230310172050.1394-3-mario.limonciello@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230310172050.1394-1-mario.limonciello@amd.com> References: <20230310172050.1394-1-mario.limonciello@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS1PEPF0000B079:EE_|PH0PR12MB8125:EE_ X-MS-Office365-Filtering-Correlation-Id: f0a8bc00-e4c7-45a4-039b-08db218bd5a4 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230025)(4636009)(136003)(376002)(396003)(39860400002)(346002)(451199018)(36840700001)(46966006)(40470700004)(8676002)(4326008)(70586007)(70206006)(54906003)(6636002)(316002)(7696005)(41300700001)(110136005)(44832011)(5660300002)(2906002)(6666004)(26005)(1076003)(2616005)(16526019)(186003)(47076005)(426003)(40480700001)(36860700001)(336012)(8936002)(478600001)(82310400005)(356005)(86362001)(36756003)(83380400001)(81166007)(82740400003)(40460700003)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Mar 2023 17:21:07.0742 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f0a8bc00-e4c7-45a4-039b-08db218bd5a4 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS1PEPF0000B079.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB8125 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org When interrupt auto clear is programmed, any read to the interrupt status register will clear all interrupts. If two interrupts have come in before one can be serviced then this will cause lost interrupts. On AMD USB4 routers this has manifested in odd problems particularly with long strings of control tranfers such as reading the DROM via bit banging. Instead of clearing interrupts automatically, clear the bit corresponding to the given ring's interrupt in the ISR. Fixes: 7a1808f82a37 ("thunderbolt: Handle ring interrupt by reading interrupt status register") Cc: Sanju Mehta Tested-by: Anson Tsao Signed-off-by: Mario Limonciello --- drivers/thunderbolt/nhi.c | 40 +++++++++++++++++++++------------- drivers/thunderbolt/nhi_regs.h | 6 +++-- 2 files changed, 29 insertions(+), 17 deletions(-) diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c index fdc0c3ba2ef01..318d20bd5b695 100644 --- a/drivers/thunderbolt/nhi.c +++ b/drivers/thunderbolt/nhi.c @@ -71,24 +71,31 @@ static void ring_interrupt_active(struct tb_ring *ring, bool active) u32 step, shift, ivr, misc; void __iomem *ivr_base; int index; + int bit; if (ring->is_tx) index = ring->hop; else index = ring->hop + ring->nhi->hop_count; - if (ring->nhi->quirks & QUIRK_AUTO_CLEAR_INT) { - /* - * Ask the hardware to clear interrupt status - * bits automatically since we already know - * which interrupt was triggered. - */ - misc = ioread32(ring->nhi->iobase + REG_DMA_MISC); - if (!(misc & REG_DMA_MISC_INT_AUTO_CLEAR)) { - misc |= REG_DMA_MISC_INT_AUTO_CLEAR; - iowrite32(misc, ring->nhi->iobase + REG_DMA_MISC); - } - } + /* + * Intel routers support a bit that isn't part of + * the USB4 spec to ask the hardware to clear + * interrupt status bits automatically since + * we already know which interrupt was triggered. + * + * Other routers explicitly disable auto-clear + * to prevent conditions that may occur where two + * MSIX interrupts are simultaneously active and + * reading the register clears both of them. + */ + misc = ioread32(ring->nhi->iobase + REG_DMA_MISC); + if (ring->nhi->quirks & QUIRK_AUTO_CLEAR_INT) + bit = REG_DMA_MISC_INT_AUTO_CLEAR; + else + bit = REG_DMA_MISC_DISABLE_AUTO_CLEAR; + if (!(misc & bit)) + iowrite32(misc | bit, ring->nhi->iobase + REG_DMA_MISC); ivr_base = ring->nhi->iobase + REG_INT_VEC_ALLOC_BASE; step = index / REG_INT_VEC_ALLOC_REGS * REG_INT_VEC_ALLOC_BITS; @@ -393,14 +400,17 @@ EXPORT_SYMBOL_GPL(tb_ring_poll_complete); static void ring_clear_msix(const struct tb_ring *ring) { + int bit; + if (ring->nhi->quirks & QUIRK_AUTO_CLEAR_INT) return; + bit = ring_interrupt_index(ring) & 31; if (ring->is_tx) - ioread32(ring->nhi->iobase + REG_RING_NOTIFY_BASE); + iowrite32(BIT(bit), ring->nhi->iobase + REG_RING_INT_CLEAR); else - ioread32(ring->nhi->iobase + REG_RING_NOTIFY_BASE + - 4 * (ring->nhi->hop_count / 32)); + iowrite32(BIT(bit), ring->nhi->iobase + REG_RING_INT_CLEAR + + 4 * (ring->nhi->hop_count / 32)); } static irqreturn_t ring_msix(int irq, void *data) diff --git a/drivers/thunderbolt/nhi_regs.h b/drivers/thunderbolt/nhi_regs.h index 0d4970dcef842..faef165a919cc 100644 --- a/drivers/thunderbolt/nhi_regs.h +++ b/drivers/thunderbolt/nhi_regs.h @@ -77,12 +77,13 @@ struct ring_desc { /* * three bitfields: tx, rx, rx overflow - * Every bitfield contains one bit for every hop (REG_HOP_COUNT). Registers are - * cleared on read. New interrupts are fired only after ALL registers have been + * Every bitfield contains one bit for every hop (REG_HOP_COUNT). + * New interrupts are fired only after ALL registers have been * read (even those containing only disabled rings). */ #define REG_RING_NOTIFY_BASE 0x37800 #define RING_NOTIFY_REG_COUNT(nhi) ((31 + 3 * nhi->hop_count) / 32) +#define REG_RING_INT_CLEAR 0x37808 /* * two bitfields: rx, tx @@ -105,6 +106,7 @@ struct ring_desc { #define REG_DMA_MISC 0x39864 #define REG_DMA_MISC_INT_AUTO_CLEAR BIT(2) +#define REG_DMA_MISC_DISABLE_AUTO_CLEAR BIT(17) #define REG_INMAIL_DATA 0x39900