So called "soft-reserved" memory is an EFI conventional memory range
with the EFI_MEMORY_SP attribute set. That attribute indicates that the
memory is not part of the platform general purpose memory pool and may
want some consideration from the system administrator about whether to
keep that memory set aside for dedicated access through device-dax (map
a device file), or assigned to the page allocator as another general
purpose memory node target.
Absent an ACPI HMAT table the default device-dax registration creates
coarse grained devices that are delineated by EFI Memory Map entries.
With the HMAT the devices are delineated by the finer grained ranges
associated with the proximity domain of the memory target. I.e. the HMAT
describes the properties of performance differentiated memory and each
unique performance description results in a unique target proximity
domain where each memory proximity domain has an associated SRAT entry
that delineates the address range.
The intent was that SRAT-defined device-dax instances are registered
first. Then any left-over address range with the EFI_MEMORY_SP
attribute, but not covered by the SRAT, would have a coarse grained
device-dax instance established. However, the scheme to detect what
ranges are left to be assigned to a device was buggy and resulted in
multiple overlapping device-dax instances. Fix this by using explicit
tracking for which ranges have been handled.
Now, this new approach may leave memory stranded in the presence of
broken platform firmware that fails to fully describe all EFI_MEMORY_SP
ranges in the HMAT. That requires a deeper fix if it becomes a problem
in practice.
(backported from commit 472faf72b33d80aa8e7a99c9410c1a23d3bf0cd8)
[mreed: resolved the conflict due to spacing. No changes to the actual
patch were made]
Signed-off-by: Michael Reed <email address hidden>
Acked-by: Jacob Martin <email address hidden>
Acked-by: Tim Gardner <email address hidden>
Signed-off-by: Stefan Bader <email address hidden>
Signed-off-by: Chia-Lin Kao (AceLan) <email address hidden>
Acked-by: Roxana Nicolescu <email address hidden>
Acked-by: Stefan Bader <email address hidden>
Signed-off-by: Stefan Bader <email address hidden>
[smb: Added annotations to not build this on armhf, arm64, and ppc64el]
This patch adds support for Fintek USB to 2CAN controller.
Changelog:
v7: https://<email address hidden>
1. Fix consistency of coding style for "break" in f81604_register_urbs().
2. Remove goto statement in f81604_open().
v6: https://<email address hidden>
1. Remove non-used define and change constant mask to GENMASK().
2. Move some variables declaration from function start to block start.
3. Move some variables initization into declaration.
4. Change variable "id" in f81604_start_xmit() only for CAN ID usage.
v5: https://<email address hidden>
1. Change all u8 *buff to struct f81604_int_data/f81604_can_frame.
2. Change all netdev->dev_id to netdev->dev_port.
3. Remove over design for f81604_process_rx_packet(). This device only
report a frame at once, so the f81604_process_rx_packet() are reduced
to process 1 frame.
v4: https://<email address hidden>
1. Remove f81604_prepare_urbs/f81604_remove_urbs() and alloc URB/buffer
dynamically in f81604_register_urbs(), using "urbs_anchor" for manage
all rx/int URBs.
2. Add F81604 to MAINTAINERS list.
3. Change handle_clear_reg_work/handle_clear_overrun_work to single
clear_reg_work and using bitwise "clear_flags" to record it.
4. Move __f81604_set_termination in front of f81604_probe() to avoid
rarely racing condition.
5. Add __aligned to struct f81604_int_data / f81604_sff / f81604_eff.
6. Add aligned operations in f81604_start_xmit/f81604_process_rx_packet().
7. Change lots of CANBUS functions first parameter from struct usb_device*
to struct f81604_port_priv *priv. But remain f81604_write / f81604_read
/ f81604_update_bits() as struct usb_device* for
__f81604_set_termination() in probe() stage.
8. Simplify f81604_read_int_callback() and separate into
f81604_handle_tx / f81604_handle_can_bus_errors() functions.
v3: https://<email address hidden>
1. Change CAN clock to using MEGA units.
2. Remove USB set/get retry, only remain SJA1000 reset/operation retry.
3. Fix all numberic constant to define.
4. Add terminator control. (only 0 & 120 ohm)
5. Using struct data to represent INT/TX/RX endpoints data instead byte
arrays.
6. Error message reports changed from %d to %pe for mnemotechnic values.
7. Some bit operations are changed to FIELD_PREP().
8. Separate TX functions from f81604_read_int_callback().
9. cf->can_id |= CAN_ERR_CNT in f81604_read_int_callback to report valid
TX/RX error counts.
10. Move f81604_prepare_urbs/f81604_remove_urbs() from CAN open/close() to
USB probe/disconnect().
11. coding style refactoring.
v2: https://<email address hidden>
1. coding style refactoring.
2. some const number are defined to describe itself.
3. fix wrong usage for can_get_echo_skb() in f81604_write_bulk_callback().
v1: https://<email address hidden>
Signed-off-by: Ji-Ze Hong (Peter Hong) <email address hidden>
Reviewed-by: Vincent Mailhol <email address hidden>
Link: https://<email address hidden>
[mkl: add changelog, fix printf format]
Signed-off-by: Marc Kleine-Budde <email address hidden>
(backported from commit 88da17436973e463bed59bea79771fb03a21555e)
[smb: Locally define CAN_ERR_CNT and replace can_dev_dropped_skb() which is not
defined in 5.15 by can_dropped_invalid_skb()]
Signed-off-by: Filippo Copetti <email address hidden>
Signed-off-by: Chia-Lin Kao (AceLan) <email address hidden>
Acked-by: Roxana Nicolescu <email address hidden>
Acked-by: Stefan Bader <email address hidden>
Signed-off-by: Stefan Bader <email address hidden>
