Date:   Mon, 19 Aug 2019 16:29:35 +0000
From:   <Mario.Limonciello@...l.com>
To:     <mika.westerberg@...ux.intel.com>, <linux-kernel@...r.kernel.org>
CC:     <andreas.noever@...il.com>, <michael.jamet@...el.com>,
        <YehezkelShB@...il.com>, <rjw@...ysocki.net>, <lenb@...nel.org>,
        <lukas@...ner.de>, <anthony.wong@...onical.com>,
        <rajmohan.mani@...el.com>, <raanan.avargil@...el.com>,
        <David.Laight@...LAB.COM>, <linux-acpi@...r.kernel.org>
Subject: RE: [PATCH v3 0/8] thunderbolt: Intel Ice Lake support

> -----Original Message-----
> From: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Sent: Monday, August 19, 2019 6:22 AM
> To: linux-kernel@...r.kernel.org
> Cc: Andreas Noever; Michael Jamet; Yehezkel Bernat; Rafael J. Wysocki; Len
> Brown; Lukas Wunner; Limonciello, Mario; Anthony Wong; Rajmohan Mani;
> Raanan Avargil; David Laight; Mika Westerberg; linux-acpi@...r.kernel.org
> Subject: [PATCH v3 0/8] thunderbolt: Intel Ice Lake support
> 
> 
> [EXTERNAL EMAIL]
> 
> Hi all,
> 
> This is third iteration of the patch series adding support for the Intel
> Ice Lake integrated Thunderbolt controller. The biggest difference from the
> previous discrete controllers is that the Ice Lake Thunderbolt controller
> is now integrated as part of the SoC. The firmware messages pretty much
> follow Titan Ridge but there are some differences as well (such as the new
> RTD3 veto notification). Also Ice Lake does not implement security levels
> so DMA protection is handled by IOMMU.
> 
> The previous versions of the series can be found here:
> 
>   v2: https://lwn.net/Articles/795979/
>   v1: https://lwn.net/Articles/793066/
> 
> Changes from v2:
> 
>   * Moved ICL specific NHI ops into a separate file (nhi_ops.c)
> 
>   * Postpone rescan thread during resume when if get device connected
>     notification from the firmware. This fixes an issue that happened
>     occasionally when resuming with full chain of devices. The driver
>     started to remove last devices in the chain even if they are still
>     connected.
> 
>   * Move call to nhi->ops->init() before CM specific probe happens.
> 
>   * Added ack from Rafael
> 
> Changes from v1:
> 
>   * Check !x86_apple_machine for Titan Ridge also.
> 
>   * Drop ioread32() when updating prod/cons because hardware ignores writes
>     to the read-only parts of the register this allows us to save one read.
> 
>   * Remove Light Ridge specific handling in eeprom.c as it is not necessary
>     after patch 4/8.
> 
>   * Moved RTD3 veto handling into separate functions to avoid code
>     duplication.
> 
>   * Reworked struct nhi_ops so that it provides hooks such as
>     runtime_suspend and so on. The NHI implementation then can use those
>     hooks to implement whatever additional logic is needed. This should
>     allow us to move those bits into a separate files in future if needed.
> 
>     I also looked whether we could replace
>     quirk_apple_poweroff_thunderbolt() using struct nhi_ops as well but it
>     turns out to be unsuitable. The reason is that the ACPI magic sequence
>     needs to be done after PCI core has moved the device into D3. The NHI
>     driver does not have easy means to do so.
> 
>   * Clarified comment in icl_nhi_suspend()
> 
>   * Added clarification comment to icl_nhi_force_power()
> 
>   * Use "Thunderbolt" instead of "TBT" in new GUID entries
> 
>   * Added reviewed tag from Yehezkel
> 
> Mika Westerberg (8):
>   thunderbolt: Correct path indices for PCIe tunnel
>   thunderbolt: Move NVM upgrade support flag to struct icm
>   thunderbolt: Use 32-bit writes when writing ring producer/consumer
>   thunderbolt: Do not fail adding switch if some port is not implemented
>   thunderbolt: Hide switch attributes that are not set
>   thunderbolt: Expose active parts of NVM even if upgrade is not supported
>   thunderbolt: Add support for Intel Ice Lake
>   ACPI / property: Add two new Thunderbolt property GUIDs to the list
> 
>  drivers/acpi/property.c        |   6 +
>  drivers/thunderbolt/Makefile   |   2 +-
>  drivers/thunderbolt/ctl.c      |  23 +++-
>  drivers/thunderbolt/eeprom.c   |   4 -
>  drivers/thunderbolt/icm.c      | 194 ++++++++++++++++++++++++++++++---
>  drivers/thunderbolt/nhi.c      | 134 +++++++++++++++++++++--
>  drivers/thunderbolt/nhi.h      |  22 ++++
>  drivers/thunderbolt/nhi_ops.c  | 179 ++++++++++++++++++++++++++++++
>  drivers/thunderbolt/nhi_regs.h |  37 +++++++
>  drivers/thunderbolt/switch.c   |  52 +++++++--
>  drivers/thunderbolt/tb_msgs.h  |  16 ++-
>  drivers/thunderbolt/tunnel.c   |   4 +-
>  include/linux/thunderbolt.h    |   2 +
>  13 files changed, 622 insertions(+), 53 deletions(-)
>  create mode 100644 drivers/thunderbolt/nhi_ops.c
> 
> --
> 2.23.0.rc1

I've tested this on a pre-production ICL platform.  This was on top of 5.3-rc5, both of
your patches from -next and this series.

I've run into a problem when using
a WD19TB that after unplugging it will cause the following to spew in dmesg:

[ 2198.017003] ============================================
[ 2198.017005] WARNING: possible recursive locking detected
[ 2198.017008] 5.3.0-rc5+ #75 Not tainted
[ 2198.017009] --------------------------------------------
[ 2198.017012] irq/122-pciehp/121 is trying to acquire lock:
[ 2198.017015] 00000000801d4de8 (&ctrl->reset_lock){.+.+}, at: pciehp_check_presence+0x1b/0x80
[ 2198.017026] 
               but task is already holding lock:
[ 2198.017028] 000000000899e2eb (&ctrl->reset_lock){.+.+}, at: pciehp_ist+0xaf/0x1c0
[ 2198.017033] 
               other info that might help us debug this:
[ 2198.017035]  Possible unsafe locking scenario:

[ 2198.017037]        CPU0
[ 2198.017038]        ----
[ 2198.017041]   lock(&ctrl->reset_lock);
[ 2198.017044]   lock(&ctrl->reset_lock);
[ 2198.017046] 
                *** DEADLOCK ***

[ 2198.017048]  May be due to missing lock nesting notation

[ 2198.017051] 3 locks held by irq/122-pciehp/121:
[ 2198.017052]  #0: 000000000899e2eb (&ctrl->reset_lock){.+.+}, at: pciehp_ist+0xaf/0x1c0
[ 2198.017057]  #1: 0000000069e1fd47 (pci_rescan_remove_lock){+.+.}, at: pciehp_unconfigure_device+0x41/0x130
[ 2198.017064]  #2: 0000000046a5bfbf (&dev->mutex){....}, at: device_release_driver_internal+0x1c/0x1a0
[ 2198.017071] 
               stack backtrace:
[ 2198.017075] CPU: 3 PID: 121 Comm: irq/122-pciehp Not tainted 5.3.0-rc5+ #75
[ 2198.017077] Hardware name: Dell Inc. XPS 13 7300/, BIOS 0.1.16 08/06/2019
[ 2198.017079] Call Trace:
[ 2198.017089]  dump_stack+0x5e/0x8b
[ 2198.017096]  __lock_acquire+0x12fe/0x1520
[ 2198.017102]  lock_acquire+0x9d/0x1a0
[ 2198.017105]  ? pciehp_check_presence+0x1b/0x80
[ 2198.017113]  ? pci_restore_standard_config+0x40/0x40
[ 2198.017118]  down_read+0x3b/0x160
[ 2198.017121]  ? pciehp_check_presence+0x1b/0x80
[ 2198.017123]  pciehp_check_presence+0x1b/0x80
[ 2198.017128]  ? quirk_disable_msi.part.29+0x31/0x31
[ 2198.017131]  pciehp_resume+0x27/0x30
[ 2198.017136]  device_for_each_child+0x47/0x90
[ 2198.017140]  ? pci_restore_standard_config+0x40/0x40
[ 2198.017145]  pcie_port_device_runtime_resume+0x30/0x50
[ 2198.017150]  pci_pm_runtime_resume+0x6e/0xc0
[ 2198.017156]  __rpm_callback+0xb0/0x110
[ 2198.017161]  ? pci_restore_standard_config+0x40/0x40
[ 2198.017165]  rpm_callback+0x1f/0x70
[ 2198.017169]  ? pci_restore_standard_config+0x40/0x40
[ 2198.017173]  rpm_resume+0x4fe/0x690
[ 2198.017179]  ? irq_forced_thread_fn+0x70/0x70
[ 2198.017183]  __pm_runtime_resume+0x47/0x80
[ 2198.017187]  device_release_driver_internal+0x7c/0x1a0
[ 2198.017191]  pci_stop_bus_device+0x5d/0x80
[ 2198.017195]  pci_stop_bus_device+0x2b/0x80
[ 2198.017198]  pci_stop_and_remove_bus_device+0xe/0x20
[ 2198.017202]  pciehp_unconfigure_device+0x7c/0x130
[ 2198.017206]  pciehp_disable_slot+0x69/0x120
[ 2198.017211]  pciehp_handle_presence_or_link_change+0x7d/0x4b0
[ 2198.017215]  pciehp_ist+0x12a/0x1c0
[ 2198.017219]  irq_thread_fn+0x1b/0x60
[ 2198.017222]  irq_thread+0x15b/0x1c0
[ 2198.017226]  ? lockdep_hardirqs_on+0x115/0x180
[ 2198.017229]  ? wake_threads_waitq+0x30/0x30
[ 2198.017233]  ? irq_thread_dtor+0x90/0x90
[ 2198.017237]  kthread+0x101/0x140
[ 2198.017241]  ? kthread_cancel_delayed_work_sync+0x10/0x10
[ 2198.017245]  ret_from_fork+0x24/0x30
[ 2198.017897] xhci_hcd 0000:03:00.0: remove, state 1
[ 2198.017917] usb usb6: USB disconnect, device number 1
[ 2198.017925] usb 6-2: USB disconnect, device number 2
[ 2198.017932] usb 6-2.3: USB disconnect, device number 3
[ 2198.017939] usb 6-2.3.1: USB disconnect, device number 5
[ 2198.019565] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[ 2198.019671] sd 0:0:0:0: [sda] Synchronize Cache(10) failed: Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
[ 2198.057200] xhci_hcd 0000:03:00.0: xHCI host controller not responding, assume dead
[ 2198.057227] r8152 6-2.4:1.0 enxd8d090034dcb: Stop submitting intr, status -108
[ 2198.057574] usb 6-2.4: USB disconnect, device number 4
[ 2198.074541] xhci_hcd 0000:03:00.0: USB bus 6 deregistered
[ 2198.074558] xhci_hcd 0000:03:00.0: remove, state 1
[ 2198.074564] usb usb5: USB disconnect, device number 1
[ 2198.074566] usb 5-2: USB disconnect, device number 2
[ 2198.074569] usb 5-2.3: USB disconnect, device number 3
[ 2198.074571] usb 5-2.3.4: USB disconnect, device number 5
[ 2198.077367] usb 5-2.3.5: USB disconnect, device number 6
[ 2198.078488] usb 5-2.5: USB disconnect, device number 4
[ 2198.080340] xhci_hcd 0000:03:00.0: Host halt failed, -19
[ 2198.080344] xhci_hcd 0000:03:00.0: Host not accessible, reset failed.
[ 2198.080770] xhci_hcd 0000:03:00.0: USB bus 5 deregistered
[ 2198.081153] pci 0000:03:00.0: Removing from iommu group 3
[ 2198.081180] pci_bus 0000:03: busn_res: [bus 03] is released
[ 2198.081287] pci 0000:02:02.0: Removing from iommu group 3
[ 2198.081396] pci_bus 0000:04: busn_res: [bus 04-2d] is released
[ 2198.081509] pci 0000:02:04.0: Removing from iommu group 3
[ 2198.082273] pci_bus 0000:02: busn_res: [bus 02-2d] is released
[ 2198.085759] pci 0000:01:00.0: Removing from iommu group 3
[ 2198.630098] thunderbolt 0-1: device disconnected

Additionally I've found after this I can't get the dock to work by hotplugging again
until I reboot the system.

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