Enable LTR for endpoints behind VMD

Bug #1896598 reported by Kai-Heng Feng
This bug affects 1 person
Affects Status Importance Assigned to Milestone
HWE Next
Fix Released
linux (Ubuntu)
Fix Released
Won't Fix
Fix Released
linux-oem-5.6 (Ubuntu)
Fix Released

Bug Description

PCIe links behind VMD may not be able to reach ASPM L1.2, because PCIe
Link Tolenrence Reporting doesn't get programmed with a sensible value.

Temporarily hardcode LTR value, which is used by Windows, for NVMe
devices behind VMD.

With the patch applied, PCIe links can reach ASPM L1.2, hence the entire
Intel SoC can reach deeper power saving state.

[Regression Potential]
This patch targets specifically Intel Tigerlake VMD bridges, so there
won't be any regression since they are not on the market yet.

Changed in linux (Ubuntu Focal):
status: New → Won't Fix
Changed in linux-oem-5.6 (Ubuntu Groovy):
status: New → Won't Fix
status: Won't Fix → Invalid
Changed in linux (Ubuntu Groovy):
importance: Undecided → Medium
Changed in linux-oem-5.6 (Ubuntu Focal):
importance: Undecided → Medium
status: New → Confirmed
Changed in linux (Ubuntu Groovy):
status: New → Confirmed
tags: added: oem-priority originate-from-1890125 somerville
Timo Aaltonen (tjaalton)
Changed in linux-oem-5.6 (Ubuntu Focal):
status: Confirmed → Fix Committed
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags: added: verification-needed-focal
tags: added: verification-done-focal
removed: verification-needed-focal
Revision history for this message
Launchpad Janitor (janitor) wrote :
Download full text (44.2 KiB)

This bug was fixed in the package linux - 5.8.0-20.21

linux (5.8.0-20.21) groovy; urgency=medium

  * groovy/linux: 5.8.0-20.21 -proposed tracker (LP: #1896668)

  * Lenovo ThinkBook 14-IML Touchpad not showing up in /proc/bus/input/devices
    (LP: #1853277)
    - i2c: core: Call i2c_acpi_install_space_handler() before

  * Enable LTR for endpoints behind VMD (LP: #1896598)
    - SAUCE: PCI/ASPM: Enable LTR for endpoints behind VMD

  * Remove duplicated code in ip_defrag.sh of kselftests/net (LP: #1894062)
    - Revert "UBUNTU: SAUCE: selftests: net: ip_defrag: modprobe missing
      nf_defrag_ipv6 support"

  * [SRU] [Focal/OEM-5.6/Groovy]Fix AMD usb host controller lost after stress S3
    (LP: #1893914)
    - SAUCE: xhci: workaround for S3 issue on AMD SNPS 3.0 xHC

  * debian/rules editconfigs does not work on s390x to change s390x only configs
    (LP: #1863116)
    - [Packaging] kernelconfig -- only update/edit configurations on architectures
      we have compiler support

  * [Ubuntu 20.10] zPCI DMA tables and bitmap leak on hard unplug (PCI Event
    0x0304) (LP: #1896216)
    - s390/pci: fix leak of DMA tables on hard unplug

  * md: improve IO accounting (LP: #1891151)
    - md: improve io stats accounting

  * Groovy update: v5.8.10 upstream stable release (LP: #1896078)
    - ARM: OMAP2+: Fix an IS_ERR() vs NULL check in _get_pwrdm()
    - ARM: dts: logicpd-torpedo-baseboard: Fix broken audio
    - ARM: dts: logicpd-som-lv-baseboard: Fix broken audio
    - ARM: dts: logicpd-som-lv-baseboard: Fix missing video
    - regulator: push allocation in regulator_ena_gpio_request() out of lock
    - regulator: remove superfluous lock in regulator_resolve_coupling()
    - ARM: dts: socfpga: fix register entry for timer3 on Arria10
    - ARM: dts: omap5: Fix DSI base address and clocks
    - ARM: dts: ls1021a: fix QuadSPI-memory reg range
    - ARM: dts: imx7ulp: Correct gpio ranges
    - arm64: dts: imx: Add missing imx8mm-beacon-kit.dtb to build
    - ARM: dts: imx7d-zii-rmu2: fix rgmii phy-mode for ksz9031 phy
    - RDMA/rtrs-srv: Replace device_register with device_initialize and device_add
    - RDMA/rxe: Fix memleak in rxe_mem_init_user
    - RDMA/rxe: Drop pointless checks in rxe_init_ports
    - RDMA/rxe: Fix panic when calling kmem_cache_create()
    - RDMA/bnxt_re: Do not report transparent vlan from QP1
    - RDMA/bnxt_re: Fix the qp table indexing
    - RDMA/bnxt_re: Static NQ depth allocation
    - RDMA/bnxt_re: Fix driver crash on unaligned PSN entry address
    - RDMA/bnxt_re: Remove the qp from list only if the qp destroy succeeds
    - drm/sun4i: add missing put_device() call in sun8i_r40_tcon_tv_set_mux()
    - arm64: dts: imx8mq: Fix TMU interrupt property
    - drm/sun4i: Fix dsi dcs long write function
    - scsi: qla2xxx: Fix regression on sparc64
    - scsi: libsas: Set data_dir as DMA_NONE if libata marks qc as NODATA
    - drm/virtio: fix unblank
    - RDMA/core: Fix unsafe linked list traversal after failing to allocate CQ
    - RDMA/core: Fix reported speed and width
    - scsi: megaraid_sas: Don't call disable_irq from process IRQ poll
    - scsi: mpt3sas: Don'...

Changed in linux (Ubuntu Groovy):
status: Confirmed → Fix Released
Revision history for this message
Launchpad Janitor (janitor) wrote :
Download full text (3.3 KiB)

This bug was fixed in the package linux-oem-5.6 - 5.6.0-1031.32

linux-oem-5.6 (5.6.0-1031.32) focal; urgency=medium

  * Packaging resync (LP: #1786013)
    - update dkms package versions

  * CVE-2020-16119
    - SAUCE: dccp: avoid double free of ccid on child socket

  * CVE-2020-16120
    - ovl: pass correct flags for opening real directory
    - ovl: switch to mounter creds in readdir
    - ovl: verify permissions in ovl_path_open()
    - ovl: call secutiry hook in ovl_real_ioctl()
    - ovl: check permission to open real file

linux-oem-5.6 (5.6.0-1030.30) focal; urgency=medium

  * focal/linux-oem-5.6: 5.6.0-1030.30 -proposed tracker (LP: #1898714)

  * Fix broken e1000e device after S3 (LP: #1897755)
    - SAUCE: e1000e: Increase polling timeout on MDIC ready bit

  * Fix headset jack detection on Dell UFF desktops (LP: #1897508)
    - Revert "ALSA: hda: call runtime_allow() for all hda controllers"

  * [SRU][OEM-5.6]Fix AMD system hang after re-plugin USBC-DP dongle
    (LP: #1896716)
    - drm/amd/display: Move USB-C workaround to after parameter variables are set

  * alsa/hda: mic doesn't work on a HP AIO machine (LP: #1897694)
    - SAUCE: ALSA: hda/realtek - set mic to auto detect on a HP AIO machine

  * CVE-2020-26088
    - net/nfc/rawsock.c: add CAP_NET_RAW check.

  * HP Zbook Studio G7 boots into corrupted screen with PSR featured panel
    (LP: #1897501)
    - SAUCE: drm/i915/psr: allow overriding PSR disable param by quirk
    - SAUCE: drm/dp: add DP_QUIRK_FORCE_PSR_CHIP_DEFAULT quirk to CMN prod-ID

linux-oem-5.6 (5.6.0-1029.29) focal; urgency=medium

  * focal/linux-oem-5.6: 5.6.0-1029.29 -proposed tracker (LP: #1895982)

  * linux-libc-dev in proposed cause seccomp_bpf from seccomp in
    ubuntu_kernel_selftests to fail on F-oem-5.6 (LP: #1896008)
    - seccomp: Fix ioctl number for SECCOMP_IOCTL_NOTIF_ID_VALID

  * Enable LTR for endpoints behind VMD (LP: #1896598)
    - SAUCE: PCI/ASPM: Enable LTR for endpoints behind VMD

  * CVE-2020-14385
    - xfs: fix boundary test in xfs_attr_shortform_verify

  * Fix non-working NVMe after S3 (LP: #1895718)
    - SAUCE: PCI: Enable ACS quirk on CML root port

  * CVE-2020-12655
    - xfs: add agf freeblocks verify in xfs_agf_verify

  * Thunderbolt3 daisy chain sometimes doesn't work (LP: #1895606)
    - thunderbolt: Retry DROM read once if parsing fails

  * CVE-2020-12656
    - sunrpc: svcauth_gss_register_pseudoflavor must reject duplicate
    - sunrpc: clean up properly in gss_mech_unregister()

  * CVE-2020-15393
    - usb: usbtest: fix missing kfree(dev->buf) in usbtest_disconnect

  * CVE-2020-12771
    - bcache: fix potential deadlock problem in btree_gc_coalesce

  * CVE-2020-15780
    - ACPI: configfs: Disallow loading ACPI tables when locked down

  * CVE-2020-16166
    - random32: update the net random state on interrupt and activity

  * Get the extended DPCD according to the related field in the DPCD registers.
    (LP: #1893752)
    - drm: move DP_MAX_DOWNSTREAM_PORTS from i915 to drm core
    - drm/i915/dp: Extract drm_dp_read_dpcd_caps()
    - SAUCE: drm/dp_mst: Retrieve extended DPCD caps for topology manager


Changed in linux-oem-5.6 (Ubuntu Focal):
status: Fix Committed → Fix Released
You-Sheng Yang (vicamo)
tags: added: originate-from-1891607
Changed in linux-oem-5.6 (Ubuntu):
status: New → Invalid
Changed in hwe-next:
status: New → Fix Released
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