aws: enable PCI write-combine for arm64

[Kamal Mostafa]

To improve PCI performance on certain arm64 AWS instance types, enable arch_can_pci_mmap_wc() via the patch:

    From: Clint Sbisa <email address hidden>
    Subject: [PATCH] arm64: Enable PCI write-combine resources under sysfs

    https://<email address hidden>/

--------------

[Impact]

 * AWS requires PCI-write-combine be enabled for arm64 via this one-line patch, to effect a significant performance improvement on certain AWS arm64 instance types.

 * After considerable discussion, upstream indicates that this patch will be accepted into mainline[0] once additional documentation details get added to the commit description.

 * Applying this patch to linux-aws affects only AWS arm64 instance types.

[Test Case]

 * Has been performance-tested by AWS; smoke-tested by me.

[Regression Potential]

 * Low.

[0] https://<email address hidden>/

[Kamal Mostafa (kamalmostafa)]

https://lists.ubuntu.com/archives/kernel-team/2020-September/113166.html

Smoke-tested on AWS arm64 instances.

[Kamal Mostafa (kamalmostafa)]

Application of this will be deferred pending resolution of upstream discussion.

[Kamal Mostafa (kamalmostafa)]

Upstream resolution: https://<email address hidden>/

TL;dr "If that's the case we can go ahead and merge this patch with a reworded commit log [...] Clint, please reword the commit and resend, not sure we can hit v5.10 but we shall try."

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-aws - 5.8.0-1008.8

---------------
linux-aws (5.8.0-1008.8) groovy; urgency=medium

  * groovy/linux-aws: 5.8.0-1008.8 -proposed tracker (LP: #1899092)

  * aws: enable PCI write-combine for arm64 (LP: #1893817)
    - SAUCE: arm64: Enable PCI write-combine resources under sysfs

  * Miscellaneous Ubuntu changes
    - CONFIG_UBUNTU_HOST=m
    - [Packaging] [aws] remove python3-venv dependency

  [ Ubuntu: 5.8.0-22.23 ]

  * groovy/linux: 5.8.0-22.23 -proposed tracker (LP: #1899099)
  * Packaging resync (LP: #1786013)
    - update dkms package versions
  * oops in nvkm_udevice_info() [nouveau] (LP: #1898130)
    - drm/nouveau/device: return error for unknown chipsets
  * python3-venv is gone (LP: #1896801)
    - SAUCE: doc: remove python3-venv dependency
  * *-tools-common packages descriptions have typo "PGKVER" (LP: #1898903)
    - [Packaging] Fix typo in -tools template s/PGKVER/PKGVER/
  * Enable brightness control on HP DreamColor panel (LP: #1898865)
    - SAUCE: drm/i915/dpcd_bl: Skip testing control capability with force DPCD
      quirk
    - SAUCE: drm/dp: HP DreamColor panel brigntness fix
  * Groovy update: v5.8.14 upstream stable release (LP: #1898853)
    - io_uring: always delete double poll wait entry on match
    - btrfs: fix filesystem corruption after a device replace
    - mmc: sdhci: Workaround broken command queuing on Intel GLK based IRBIS
      models
    - USB: gadget: f_ncm: Fix NDP16 datagram validation
    - Revert "usbip: Implement a match function to fix usbip"
    - usbcore/driver: Fix specific driver selection
    - usbcore/driver: Fix incorrect downcast
    - usbcore/driver: Accommodate usbip
    - gpio: siox: explicitly support only threaded irqs
    - gpio: mockup: fix resource leak in error path
    - gpio: tc35894: fix up tc35894 interrupt configuration
    - gpio: amd-fch: correct logic of GPIO_LINE_DIRECTION
    - clk: samsung: Keep top BPLL mux on Exynos542x enabled
    - clk: socfpga: stratix10: fix the divider for the emac_ptp_free_clk
    - scsi: iscsi: iscsi_tcp: Avoid holding spinlock while calling getpeername()
    - i2c: i801: Exclude device from suspend direct complete optimization
    - Input: i8042 - add nopnp quirk for Acer Aspire 5 A515
    - iio: adc: qcom-spmi-adc5: fix driver name
    - ftrace: Move RCU is watching check after recursion check
    - tracing: Fix trace_find_next_entry() accounting of temp buffer size
    - memstick: Skip allocating card when removing host
    - drm/amdgpu: restore proper ref count in amdgpu_display_crtc_set_config
    - xen/events: don't use chip_data for legacy IRQs
    - clocksource/drivers/timer-gx6605s: Fixup counter reload
    - vboxsf: Fix the check for the old binary mount-arguments struct
    - mt76: mt7915: use ieee80211_free_txskb to free tx skbs
    - libbpf: Remove arch-specific include path in Makefile
    - drivers/net/wan/hdlc_fr: Add needed_headroom for PVC devices
    - Revert "wlcore: Adding suppoprt for IGTK key in wlcore driver"
    - drm/sun4i: mixer: Extend regmap max_register
    - hv_netvsc: Cache the current data path to avoid duplicate call and message
    - net: dec: de2104x: Increase receive...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-aws - 4.15.0-1087.92

---------------
linux-aws (4.15.0-1087.92) bionic; urgency=medium

  * bionic/linux-aws: 4.15.0-1087.92 -proposed tracker (LP: #1900674)

  * CVE-2020-12351 // CVE-2020-12352 // CVE-2020-24490
    - [Config] aws: Disable BlueZ highspeed support

  * EFA: add support for 0xefa1 devices (LP: #1896791)
    - RDMA/efa: Expose maximum TX doorbell batch
    - RDMA/efa: Expose minimum SQ size
    - RDMA/efa: User/kernel compatibility handshake mechanism
    - RDMA/efa: Add EFA 0xefa1 PCI ID

  * aws: enable PCI write-combine for arm64 (LP: #1893817)
    - SAUCE: arm64: Enable PCI write-combine resources under sysfs

  [ Ubuntu: 4.15.0-122.124 ]

  * bionic/linux: 4.15.0-122.124 -proposed tracker (LP: #1899941)
  * CVE-2020-12351 // CVE-2020-12352 // CVE-2020-24490
    - Bluetooth: Disable High Speed by default
    - Bluetooth: MGMT: Fix not checking if BT_HS is enabled
    - [Config] Disable BlueZ highspeed support
  * CVE-2020-12351
    - Bluetooth: L2CAP: Fix calling sk_filter on non-socket based channel
  * CVE-2020-12352
    - Bluetooth: A2MP: Fix not initializing all members

 -- Stefan Bader <email address hidden> Tue, 20 Oct 2020 12:01:06 +0200

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-aws - 5.4.0-1029.30

---------------
linux-aws (5.4.0-1029.30) focal; urgency=medium

  * focal/linux-aws: 5.4.0-1029.30 -proposed tracker (LP: #1900671)

  * CVE-2020-12351 // CVE-2020-12352 // CVE-2020-24490
    - [Config] [aws] Disable BlueZ highspeed support

  * EFA: add support for 0xefa1 devices (LP: #1896791)
    - RDMA/efa: Expose maximum TX doorbell batch
    - RDMA/efa: Expose minimum SQ size
    - RDMA/efa: User/kernel compatibility handshake mechanism
    - RDMA/efa: Add EFA 0xefa1 PCI ID

  * aws: enable PCI write-combine for arm64 (LP: #1893817)
    - SAUCE: arm64: Enable PCI write-combine resources under sysfs

  * AWS: enable FPGA support in amd64 AWS kernels (LP: #1898781)
    - [Config] aws: enable FPGA for amd64 also

  [ Ubuntu: 5.4.0-52.57 ]

  * focal/linux: 5.4.0-52.57 -proposed tracker (LP: #1899920)
  * CVE-2020-12351 // CVE-2020-12352 // CVE-2020-24490
    - Bluetooth: Disable High Speed by default
    - Bluetooth: MGMT: Fix not checking if BT_HS is enabled
    - [Config] Disable BlueZ highspeed support
  * CVE-2020-12351
    - Bluetooth: L2CAP: Fix calling sk_filter on non-socket based channel
  * CVE-2020-12352
    - Bluetooth: A2MP: Fix not initializing all members

 -- Andrea Righi <email address hidden> Tue, 20 Oct 2020 11:32:33 +0200