From patchwork Mon Feb 6 12:21:09 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Gerd Hoffmann X-Patchwork-Id: 724484 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3vH66Q6Dkpz9ryr for ; Mon, 6 Feb 2017 23:22:06 +1100 (AEDT) Received: from localhost ([::1]:47087 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1caiIz-0005F7-Oj for incoming@patchwork.ozlabs.org; Mon, 06 Feb 2017 07:22:01 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60945) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1caiIJ-0004kl-GF for qemu-devel@nongnu.org; Mon, 06 Feb 2017 07:21:20 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1caiIF-0006Kl-J0 for qemu-devel@nongnu.org; Mon, 06 Feb 2017 07:21:19 -0500 Received: from mx1.redhat.com ([209.132.183.28]:54268) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1caiIF-0006KL-BD for qemu-devel@nongnu.org; Mon, 06 Feb 2017 07:21:15 -0500 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id F1BC581252 for ; Mon, 6 Feb 2017 12:21:14 +0000 (UTC) Received: from nilsson.home.kraxel.org (ovpn-116-97.ams2.redhat.com [10.36.116.97]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id v16CLDXG028416; Mon, 6 Feb 2017 07:21:14 -0500 Received: by nilsson.home.kraxel.org (Postfix, from userid 500) id 26C8E8084E; Mon, 6 Feb 2017 13:21:11 +0100 (CET) From: Gerd Hoffmann To: qemu-devel@nongnu.org Date: Mon, 6 Feb 2017 13:21:09 +0100 Message-Id: <1486383669-6421-1-git-send-email-kraxel@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Mon, 06 Feb 2017 12:21:15 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH] xhci: apply limits to loops X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Gerd Hoffmann Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Limits should be big enough that normal guest should not hit it. Add a tracepoint to log them, just in case. Also, while being at it, log the existing link trb limit too. Reported-by: 李强 Signed-off-by: Gerd Hoffmann --- hw/usb/hcd-xhci.c | 15 ++++++++++++++- hw/usb/trace-events | 1 + 2 files changed, 15 insertions(+), 1 deletion(-) diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c index fbf8a8b..28dd2f2 100644 --- a/hw/usb/hcd-xhci.c +++ b/hw/usb/hcd-xhci.c @@ -51,6 +51,8 @@ #define EV_QUEUE (((3 * 24) + 16) * MAXSLOTS) #define TRB_LINK_LIMIT 4 +#define COMMAND_LIMIT 256 +#define TRANSFER_LIMIT 256 #define LEN_CAP 0x40 #define LEN_OPER (0x400 + 0x10 * MAXPORTS) @@ -943,6 +945,7 @@ static TRBType xhci_ring_fetch(XHCIState *xhci, XHCIRing *ring, XHCITRB *trb, return type; } else { if (++link_cnt > TRB_LINK_LIMIT) { + trace_usb_xhci_enforced_limit("trb-link"); return 0; } ring->dequeue = xhci_mask64(trb->parameter); @@ -2060,6 +2063,7 @@ static void xhci_kick_epctx(XHCIEPContext *epctx, unsigned int streamid) XHCIRing *ring; USBEndpoint *ep = NULL; uint64_t mfindex; + unsigned int count = 0; int length; int i; @@ -2172,6 +2176,10 @@ static void xhci_kick_epctx(XHCIEPContext *epctx, unsigned int streamid) epctx->retry = xfer; break; } + if (count++ > TRANSFER_LIMIT) { + trace_usb_xhci_enforced_limit("transfers"); + break; + } } epctx->kick_active--; @@ -2618,7 +2626,7 @@ static void xhci_process_commands(XHCIState *xhci) TRBType type; XHCIEvent event = {ER_COMMAND_COMPLETE, CC_SUCCESS}; dma_addr_t addr; - unsigned int i, slotid = 0; + unsigned int i, slotid = 0, count = 0; DPRINTF("xhci_process_commands()\n"); if (!xhci_running(xhci)) { @@ -2735,6 +2743,11 @@ static void xhci_process_commands(XHCIState *xhci) } event.slotid = slotid; xhci_event(xhci, &event, 0); + + if (count++ > COMMAND_LIMIT) { + trace_usb_xhci_enforced_limit("commands"); + return; + } } } diff --git a/hw/usb/trace-events b/hw/usb/trace-events index fdd1d29..0c323d4 100644 --- a/hw/usb/trace-events +++ b/hw/usb/trace-events @@ -174,6 +174,7 @@ usb_xhci_xfer_retry(void *xfer) "%p" usb_xhci_xfer_success(void *xfer, uint32_t bytes) "%p: len %d" usb_xhci_xfer_error(void *xfer, uint32_t ret) "%p: ret %d" usb_xhci_unimplemented(const char *item, int nr) "%s (0x%x)" +usb_xhci_enforced_limit(const char *item) "%s" # hw/usb/desc.c usb_desc_device(int addr, int len, int ret) "dev %d query device, len %d, ret %d"