From patchwork Thu Jun 17 15:03:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mathias Nyman X-Patchwork-Id: 462642 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham 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 0E828C49EA2 for ; Thu, 17 Jun 2021 15:01:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E621561406 for ; Thu, 17 Jun 2021 15:01:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232946AbhFQPDz (ORCPT ); Thu, 17 Jun 2021 11:03:55 -0400 Received: from mga04.intel.com ([192.55.52.120]:23962 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232964AbhFQPDx (ORCPT ); Thu, 17 Jun 2021 11:03:53 -0400 IronPort-SDR: 0uUOEHKw3/c5RrZ4SuXdrqNFpbBY3xXvjRXaIg1MFU9HGNwU6Rsey3YAohPo1g1rhwOnM1uE01 mlkrTkg13gRQ== X-IronPort-AV: E=McAfee;i="6200,9189,10017"; a="204557459" X-IronPort-AV: E=Sophos;i="5.83,280,1616482800"; d="scan'208";a="204557459" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jun 2021 08:01:45 -0700 IronPort-SDR: h7pnAAPleQ2VSFCJP6jzzml/5H02gMnoW8ObGss22lrkxZIMfdIZEAP9CdwsQC5ENwdEzPyh4N a7RE4BEbMqSA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.83,280,1616482800"; d="scan'208";a="479490848" Received: from mattu-haswell.fi.intel.com ([10.237.72.170]) by FMSMGA003.fm.intel.com with ESMTP; 17 Jun 2021 08:01:44 -0700 From: Mathias Nyman To: Cc: , Mathias Nyman Subject: [PATCH 2/4] xhci: Add adaptive interrupt rate for isoch TRBs with XHCI_AVOID_BEI quirk Date: Thu, 17 Jun 2021 18:03:52 +0300 Message-Id: <20210617150354.1512157-3-mathias.nyman@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210617150354.1512157-1-mathias.nyman@linux.intel.com> References: <20210617150354.1512157-1-mathias.nyman@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Save a bit of power by not interrupting so often by default if XHCI_AVOID_BEI quirk is set. In normal cases the xhci driver will only generate an interrupt on the last isochronous TRB of an URB. In a common UVC webcam usecase there are 32 TRBs per URB. if AVOID_BEI flag is set then xhci driver will force an interrupt every 8th isoc TRB to make sure the event ring doesn't get too full. This is however way too frequent in common single webcam use cases, causing 1000 interrupts/sec and thus poor powermanagement performance. Instead start with interrupting every 32 isoc TRB, and halve it in case event ring becomes half-full. Stop halving when reaching a rate of every 8th trb. This is a one way solution. If interrupt rate is increased it will stay high until driver is reloaded. The highest rate is the same as the old default rate. Signed-off-by: Mathias Nyman --- drivers/usb/host/xhci-mem.c | 2 ++ drivers/usb/host/xhci-ring.c | 7 ++++++- drivers/usb/host/xhci.h | 7 +++++++ 3 files changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index f66815fe8482..2f6da35e7977 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -2547,6 +2547,8 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags) xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Wrote ERST address to ir_set 0."); + xhci->isoc_bei_interval = AVOID_BEI_INTERVAL_MAX; + /* * XXX: Might need to set the Interrupter Moderation Register to * something other than the default (~1ms minimum between interrupts). diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 6acd2329e08d..8fea44bbc266 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -3076,6 +3076,11 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd) if (event_loop++ < TRBS_PER_SEGMENT / 2) continue; xhci_update_erst_dequeue(xhci, event_ring_deq); + + /* ring is half-full, force isoc trbs to interrupt more often */ + if (xhci->isoc_bei_interval > AVOID_BEI_INTERVAL_MIN) + xhci->isoc_bei_interval = xhci->isoc_bei_interval / 2; + event_loop = 0; } @@ -3956,7 +3961,7 @@ static bool trb_block_event_intr(struct xhci_hcd *xhci, int num_tds, int i) * generate an event at least every 8th TD to clear the event ring */ if (i && xhci->quirks & XHCI_AVOID_BEI) - return !!(i % 8); + return !!(i % xhci->isoc_bei_interval); return true; } diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 85ba326806ab..5ba01d5ccab8 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1526,6 +1526,12 @@ static inline const char *xhci_trb_type_string(u8 type) #define TRB_BUFF_LEN_UP_TO_BOUNDARY(addr) (TRB_MAX_BUFF_SIZE - \ (addr & (TRB_MAX_BUFF_SIZE - 1))) #define MAX_SOFT_RETRY 3 +/* + * Limits of consecutive isoc trbs that can Block Event Interrupt (BEI) if + * XHCI_AVOID_BEI quirk is in use. + */ +#define AVOID_BEI_INTERVAL_MIN 8 +#define AVOID_BEI_INTERVAL_MAX 32 struct xhci_segment { union xhci_trb *trbs; @@ -1768,6 +1774,7 @@ struct xhci_hcd { u8 isoc_threshold; /* imod_interval in ns (I * 250ns) */ u32 imod_interval; + u32 isoc_bei_interval; int event_ring_max; /* 4KB min, 128MB max */ int page_size;