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  1. 15 Jan, 2020 1 commit
    • Wayne Lin's avatar
      drm/dp_mst: Have DP_Tx send one msg at a time · 5a64967a
      Wayne Lin authored 
      [Why]
Noticed this while testing MST with the 4 ports MST hub from
StarTech.com. Sometimes can't light up monitors normally and get the
error message as 'sideband msg build failed'.

Look into aux transactions, found out that source sometimes will send
out another down request before receiving the down reply of the
previous down request. On the other hand, in drm_dp_get_one_sb_msg(),
current code doesn't handle the interleaved replies case. Hence, source
can't build up message completely and can't light up monitors.

[How]
For good compatibility, enforce source to send out one down request at a
time. Add a flag, is_waiting_for_dwn_reply, to determine if the source
can send out a down request immediately or not.

- Check the flag before calling process_single_down_tx_qlock to send out
a msg
- Set the flag when successfully send out a down request
- Clear the flag when successfully build up a down reply
- Clear the flag when find erros during sending out a down request
- Clear the flag when find errors during building up a down reply
- Clear the flag when timeout occurs during waiting for a down reply
- Use drm_dp_mst_kick_tx() to try to send another down request in queue
at the end of drm_dp_mst_wait_tx_reply() (attempt to send out messages
in queue when errors occur)

Cc: Lyude Paul <lyude@redhat.com>
Signed-off-by: default avatarWayne Lin <Wayne.Lin@amd.com>
Signed-off-by: default avatarLyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200113093649.11755-1-Wayne.Lin@amd.com
      5a64967a
  3. 14 Jan, 2020 1 commit
    • Wayne Lin's avatar
      drm/dp_mst: clear time slots for ports invalid · 7617e962
      Wayne Lin authored 
      [Why]
When change the connection status in a MST topology, mst device
which detect the event will send out CONNECTION_STATUS_NOTIFY messgae.

e.g. src-mst-mst-sst => src-mst (unplug) mst-sst

Currently, under the above case of unplugging device, ports which have
been allocated payloads and are no longer in the topology still occupy
time slots and recorded in proposed_vcpi[] of topology manager.

If we don't clean up the proposed_vcpi[], when code flow goes to try to
update payload table by calling drm_dp_update_payload_part1(), we will
fail at checking port validation due to there are ports with proposed
time slots but no longer in the mst topology. As the result of that, we
will also stop updating the DPCD payload table of down stream port.

[How]
While handling the CONNECTION_STATUS_NOTIFY message, add a detection to
see if the event indicates that a device is unplugged to an output port.
If the detection is true, then iterrate over all proposed_vcpi[] to
see whether a port of the proposed_vcpi[] is still in the topology or
not. If the port is invalid, set its num_slots to 0.

Thereafter, when try to update payload table by calling
drm_dp_update_payload_part1(), we can successfully update the DPCD
payload table of down stream port and clear the proposed_vcpi[] to NULL.

Changes since v1:(https://patchwork.kernel.org/patch/11275801/)
* Invert the conditional to reduce the indenting
Reviewed-by: default avatarLyude Paul <lyude@redhat.com>
Signed-off-by: default avatarWayne Lin <Wayne.Lin@amd.com>
Signed-off-by: default avatarLyude Paul <lyude@redhat.com>
[removed cc for stable - there's too many patches this depends on for
this to backport cleanly]
Link: https://patchwork.freedesktop.org/patch/msgid/20200106102158.28261-1-Wayne.Lin@amd.com
      7617e962
  5. 13 Jan, 2020 2 commits
  7. 10 Jan, 2020 1 commit
  9. 09 Jan, 2020 2 commits
  11. 07 Jan, 2020 12 commits
  13. 05 Jan, 2020 7 commits
    • Linus Torvalds's avatar
      Linux 5.5-rc5 · c79f46a2
      Linus Torvalds authored
      c79f46a2
    • Linus Torvalds's avatar
      Merge tag 'riscv/for-v5.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux · 768fc661
      Linus Torvalds authored 
      Pull RISC-V fixes from Paul Walmsley:
 "Several fixes for RISC-V:

   - Fix function graph trace support

   - Prefix the CSR IRQ_* macro names with "RV_", to avoid collisions
     with macros elsewhere in the Linux kernel tree named "IRQ_TIMER"

   - Use __pa_symbol() when computing the physical address of a kernel
     symbol, rather than __pa()

   - Mark the RISC-V port as supporting GCOV

  One DT addition:

   - Describe the L2 cache controller in the FU540 DT file

  One documentation update:

   - Add patch acceptance guideline documentation"

* tag 'riscv/for-v5.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  Documentation: riscv: add patch acceptance guidelines
  riscv: prefix IRQ_ macro names with an RV_ namespace
  clocksource: riscv: add notrace to riscv_sched_clock
  riscv: ftrace: correct the condition logic in function graph tracer
  riscv: dts: Add DT support for SiFive L2 cache controller
  riscv: gcov: enable gcov for RISC-V
  riscv: mm: use __pa_symbol for kernel symbols
      768fc661
    • Paul Walmsley's avatar
      Documentation: riscv: add patch acceptance guidelines · 0e194d9d
      Paul Walmsley authored 
      Formalize, in kernel documentation, the patch acceptance policy for
arch/riscv.  In summary, it states that as maintainers, we plan to
only accept patches for new modules or extensions that have been
frozen or ratified by the RISC-V Foundation.

We've been following these guidelines for the past few months.  In the
meantime, we've received quite a bit of feedback that it would be
helpful to have these guidelines formally documented.

Based on a suggestion from Matthew Wilcox, we also add a link to this
file to Documentation/process/index.rst, to make this document easier
to find.  The format of this document has also been changed to align
to the format outlined in the maintainer entry profiles, in accordance
with comments from Jon Corbet and Dan Williams.
Signed-off-by: default avatarPaul Walmsley <paul.walmsley@sifive.com>
Reviewed-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Krste Asanovic <krste@berkeley.edu>
Cc: Andrew Waterman <waterman@eecs.berkeley.edu>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Jonathan Corbet <corbet@lwn.net>
      0e194d9d
    • Paul Walmsley's avatar
      riscv: prefix IRQ_ macro names with an RV_ namespace · 2f3035da
      Paul Walmsley authored 
      "IRQ_TIMER", used in the arch/riscv CSR header file, is a sufficiently
generic macro name that it's used by several source files across the
Linux code base.  Some of these other files ultimately include the
arch/riscv CSR include file, causing collisions.  Fix by prefixing the
RISC-V csr.h IRQ_ macro names with an RV_ prefix.

Fixes: a4c3733d ("riscv: abstract out CSR names for supervisor vs machine mode")
Reported-by: default avatarOlof Johansson <olof@lixom.net>
Acked-by: default avatarOlof Johansson <olof@lixom.net>
Signed-off-by: default avatarPaul Walmsley <paul.walmsley@sifive.com>
      2f3035da
    • Zong Li's avatar
      clocksource: riscv: add notrace to riscv_sched_clock · 9d05c18e
      Zong Li authored 
      When enabling ftrace graph tracer, it gets the tracing clock in
ftrace_push_return_trace().  Eventually, it invokes riscv_sched_clock()
to get the clock value.  If riscv_sched_clock() isn't marked with
'notrace', it will call ftrace_push_return_trace() and cause infinite
loop.

The result of failure as follow:

command: echo function_graph >current_tracer
[   46.176787] Unable to handle kernel paging request at virtual address ffffffe04fb38c48
[   46.177309] Oops [#1]
[   46.177478] Modules linked in:
[   46.177770] CPU: 0 PID: 256 Comm: $d Not tainted 5.5.0-rc1 #47
[   46.177981] epc: ffffffe00035e59a ra : ffffffe00035e57e sp : ffffffe03a7569b0
[   46.178216]  gp : ffffffe000d29b90 tp : ffffffe03a756180 t0 : ffffffe03a756968
[   46.178430]  t1 : ffffffe00087f408 t2 : ffffffe03a7569a0 s0 : ffffffe03a7569f0
[   46.178643]  s1 : ffffffe00087f408 a0 : 0000000ac054cda4 a1 : 000000000087f411
[   46.178856]  a2 : 0000000ac054cda4 a3 : 0000000000373ca0 a4 : ffffffe04fb38c48
[   46.179099]  a5 : 00000000153e22a8 a6 : 00000000005522ff a7 : 0000000000000005
[   46.179338]  s2 : ffffffe03a756a90 s3 : ffffffe00032811c s4 : ffffffe03a756a58
[   46.179570]  s5 : ffffffe000d29fe0 s6 : 0000000000000001 s7 : 0000000000000003
[   46.179809]  s8 : 0000000000000003 s9 : 0000000000000002 s10: 0000000000000004
[   46.180053]  s11: 0000000000000000 t3 : 0000003fc815749c t4 : 00000000000efc90
[   46.180293]  t5 : ffffffe000d29658 t6 : 0000000000040000
[   46.180482] status: 0000000000000100 badaddr: ffffffe04fb38c48 cause: 000000000000000f
Signed-off-by: default avatarZong Li <zong.li@sifive.com>
Reviewed-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
[paul.walmsley@sifive.com: cleaned up patch description]
Fixes: 92e0d143 ("clocksource/drivers/riscv_timer: Provide the sched_clock")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarPaul Walmsley <paul.walmsley@sifive.com>
      9d05c18e
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · 36487907
      Linus Torvalds authored 
      Merge misc fixes from Andrew Morton:
 "17 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  hexagon: define ioremap_uc
  ocfs2: fix the crash due to call ocfs2_get_dlm_debug once less
  ocfs2: call journal flush to mark journal as empty after journal recovery when mount
  mm/hugetlb: defer freeing of huge pages if in non-task context
  mm/gup: fix memory leak in __gup_benchmark_ioctl
  mm/oom: fix pgtables units mismatch in Killed process message
  fs/posix_acl.c: fix kernel-doc warnings
  hexagon: work around compiler crash
  hexagon: parenthesize registers in asm predicates
  fs/namespace.c: make to_mnt_ns() static
  fs/nsfs.c: include headers for missing declarations
  fs/direct-io.c: include fs/internal.h for missing prototype
  mm: move_pages: return valid node id in status if the page is already on the target node
  memcg: account security cred as well to kmemcg
  kcov: fix struct layout for kcov_remote_arg
  mm/zsmalloc.c: fix the migrated zspage statistics.
  mm/memory_hotplug: shrink zones when offlining memory
      36487907
    • Linus Torvalds's avatar
      Merge tag 'apparmor-pr-2020-01-04' of... · a125bcda
      Linus Torvalds authored 
      Merge tag 'apparmor-pr-2020-01-04' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor

Pull apparmor fixes from John Johansen:

 - performance regression: only get a label reference if the fast path
   check fails

 - fix aa_xattrs_match() may sleep while holding a RCU lock

 - fix bind mounts aborting with -ENOMEM

* tag 'apparmor-pr-2020-01-04' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor:
  apparmor: fix aa_xattrs_match() may sleep while holding a RCU lock
  apparmor: only get a label reference if the fast path check fails
  apparmor: fix bind mounts aborting with -ENOMEM
      a125bcda
  15. 04 Jan, 2020 14 commits
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