Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755354AbbLAIV4 (ORCPT ); Tue, 1 Dec 2015 03:21:56 -0500 Received: from mga11.intel.com ([192.55.52.93]:63362 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751088AbbLAIVy (ORCPT ); Tue, 1 Dec 2015 03:21:54 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,368,1444719600"; d="scan'208";a="610490364" From: Mathias Nyman To: daniel@quora.org Cc: , , linux-kernel@vger.kernel.org, Mathias Nyman Subject: [TESTPATCH v2] xhci: fix usb2 resume timing and races. Date: Tue, 1 Dec 2015 10:26:58 +0200 Message-Id: <1448958418-6114-1-git-send-email-mathias.nyman@linux.intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5516 Lines: 134 usb2 ports need to signal resume for 20ms before moving to U0 state. Both device and host can initiate resume. On host initated resume port is set to resume state, sleep 20ms, and finally set port to U0 state. On device initated resume a port status interrupt with a port in resume state in issued. The interrupt handler tags a resume_done[port] timestamp with current time + 20ms, and kick roothub timer. Root hub timer requests for port status, finds the port in resume state, checks if resume_done[port] timestamp passed, and set port to U0 state. There are a few issues with this approach, 1. A host initated resume will also generate a resume event, the event handler will find the port in resume state, believe it's a device initated and act accordingly. 2. A port status request might cut the 20ms resume signalling short if a get_port_status request is handled during the 20ms host resume. The port will be found in resume state. The timestamp is not set leading to time_after_eq(jiffoes, timestamp) returning true, as timestamp = 0. get_port_status will proceed with moving the port to U0. 3. If an error, or anything else happends to the port during device initated 20ms resume signalling it will leave all device resume parameters hanging uncleared preventing further resume. Fix this by using the existing resuming_ports bitfield to indicate if resume signalling timing is taken care of. Also check if the resume_done[port] is set before using it in time comparison. Also clear out any resume signalling related variables if port is not in U0 or Resume state. v2. fix parentheses when checking for uncleared resume variables. we want: if ((unclear1 OR unclear2 ) AND !in_resume AND !in_U3) { .. } Signed-off-by: Mathias Nyman --- drivers/usb/host/xhci-hub.c | 38 ++++++++++++++++++++++++++++++++++++-- drivers/usb/host/xhci-ring.c | 3 ++- 2 files changed, 38 insertions(+), 3 deletions(-) diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c index 78241b5..a750298 100644 --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -616,8 +616,30 @@ static u32 xhci_get_port_status(struct usb_hcd *hcd, if ((raw_port_status & PORT_RESET) || !(raw_port_status & PORT_PE)) return 0xffffffff; - if (time_after_eq(jiffies, - bus_state->resume_done[wIndex])) { + /* did port event handler already start 20ms resume timing? */ + if (!bus_state->resume_done[wIndex]) { + /* If not, maybe we are in a host initated resume? */ + if (test_bit(wIndex, &bus_state->resuming_ports)) { + /* Host initated resume doesn't time the resume + * signalling using resume_done[]. + * It manually sets RESUME state, sleeps 20ms + * and sets U0 state. This should probably be + * changed, but not right now, do nothing + */ + } else { + /* port resume was discovered now and here, + * start resume timing + */ + unsigned long timeout = jiffies + + msecs_to_jiffies(USB_RESUME_TIMEOUT); + + set_bit(wIndex, &bus_state->resuming_ports); + bus_state->resume_done[wIndex] = timeout; + mod_timer(&hcd->rh_timer, timeout); + } + /* Has resume been signalled for 20ms? yet? */ + } else if (time_after_eq(jiffies, + bus_state->resume_done[wIndex])) { int time_left; xhci_dbg(xhci, "Resume USB2 port %d\n", @@ -665,6 +687,16 @@ static u32 xhci_get_port_status(struct usb_hcd *hcd, status |= USB_PORT_STAT_SUSPEND; } } + /* Clear stale usb2 resume signalling variables in case port changed + * state during 20ms resume signalling. For example on error + */ + if ((bus_state->resume_done[wIndex] || + test_bit(wIndex, &bus_state->resuming_ports)) && + (raw_port_status & PORT_PLS_MASK) != XDEV_U3 && + (raw_port_status & PORT_PLS_MASK) != XDEV_RESUME) { + bus_state->resume_done[wIndex] = 0; + clear_bit(wIndex, &bus_state->resuming_ports); + } if ((raw_port_status & PORT_PLS_MASK) == XDEV_U0 && (raw_port_status & PORT_POWER) && (bus_state->suspended_ports & (1 << wIndex))) { @@ -995,6 +1027,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, if ((temp & PORT_PE) == 0) goto error; + set_bit(wIndex, &bus_state->resuming_ports); xhci_set_link_state(xhci, port_array, wIndex, XDEV_RESUME); spin_unlock_irqrestore(&xhci->lock, flags); @@ -1002,6 +1035,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, spin_lock_irqsave(&xhci->lock, flags); xhci_set_link_state(xhci, port_array, wIndex, XDEV_U0); + clear_bit(wIndex, &bus_state->resuming_ports); } bus_state->port_c_suspend |= 1 << wIndex; diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 97ffe39..3743bb2 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -1583,7 +1583,8 @@ static void handle_port_status(struct xhci_hcd *xhci, */ bogus_port_status = true; goto cleanup; - } else { + } else if (!test_bit(faked_port_index, + &bus_state->resuming_ports)) { xhci_dbg(xhci, "resume HS port %d\n", port_id); bus_state->resume_done[faked_port_index] = jiffies + msecs_to_jiffies(USB_RESUME_TIMEOUT); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/