[RFC PR] RISC-V changes for 4.17

Tue Apr 3 00:22:13 PDT 2018

Hi Palmer,
A bit off-topic question:
What is the best way to boot/test riscv-linux tree with freedom-u-sdk setup ?
The tag riscv-for-linus-4.17-mw0 in riscv-linux repo doesn't boot with qemu in freedom-u-sdk setup.
I verified that riscv-all from github boots fine. So I tried cherry-picking the missing changes from riscv-linux to riscv-all branch. It still failed to boot.

It might be a my work space specific issue but couldn't identify what's causing it hang.

kernel hangs during the boot after:
[    0.000000] usbcore: registered new interface driver usb-storage
[    0.000000] usbcore: registered new interface driver usbhid
[    0.000000] usbhid: USB HID core driver
[    0.000000] NET: Registered protocol family 17
[    0.000000] Freeing unused kernel memory: 7976K
[    0.000000] This architecture does not have kernel memory protection.

Regards,
Atish

> On Apr 2, 2018, at 8:58 PM, Palmer Dabbelt <palmer at sifive.com> wrote:
> 
> Here's the PR I'm planning on submitting to Linus for the first half of the
> 4.17 merge window.  Unless anyone knows of any problems I'll submit the PR on
> Wednesday morning.  I haven't given this a much testing as I probably should
> have, so please go give things a shot!
> 
> I don't want to take any new code for Wednesday, but I'm planning on taking the
> perf stuff for next week if some small issues iron themselves out.
> 
> Thanks to everyone for all the help!
> 
>    The following changes since commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda:
> 
>      Linux 4.16 (2018-04-01 14:20:27 -0700)
> 
>    are available in the Git repository at:
> 
>      git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux.git tags/riscv-for-linus-4.17-mw0
> 
>    for you to fetch changes up to 7a8e7da42250138adf202ba2596ef7f68651060a:
> 
>      RISC-V: Fixes to module loading (2018-04-02 20:43:14 -0700)
> 
>    ----------------------------------------------------------------
>    RISC-V changes for 4.17
> 
>    This tag contains the new features we'd like to incorporate into the
>    RISC-V port for 4.17.  We might have a bit more stuff land later in the
>    merge window, but I wanted to get this out earlier just so everyone can
>    see where we currently stand.
> 
>    A short summary of the changes is:
> 
>    * We've added support for dynamic ftrace on RISC-V targets.
>    * There have been a handful of cleanups to our atomic and locking
>      routines.  They now more closely match the released RISC-V memory
>      model draft.
>    * Our module loading support has been cleaned up and is now enabled by
>      default, despite some limitations still existing.
> 
>    There's more information in the merge commits for each patch set.
> 
>    ----------------------------------------------------------------
>    Alan Kao (6):
>          riscv/ftrace: Add RECORD_MCOUNT support
>          riscv/ftrace: Add dynamic function tracer support
>          riscv/ftrace: Add dynamic function graph tracer support
>          riscv/ftrace: Add ARCH_SUPPORTS_FTRACE_OPS support
>          riscv/ftrace: Add DYNAMIC_FTRACE_WITH_REGS support
>          riscv/ftrace: Add HAVE_FUNCTION_GRAPH_RET_ADDR_PTR support
> 
>    Andrea Parri (3):
>          riscv/barrier: Define __smp_{store_release,load_acquire}
>          riscv/spinlock: Strengthen implementations with fences
>          riscv/atomic: Strengthen implementations with fences
> 
>    Palmer Dabbelt (3):
>          RISC-V: Add dynamic ftrace support for RISC-V platforms
>          RISC-V: Assorted memory model fixes
>          RISC-V: Fixes to module loading
> 
>    Zong Li (11):
>          RISC-V: Add sections of PLT and GOT for kernel module
>          RISC-V: Add section of GOT.PLT for kernel module
>          RISC-V: Support GOT_HI20/CALL_PLT relocation type in kernel module
>          RISC-V: Support CALL relocation type in kernel module
>          RISC-V: Support HI20/LO12_I/LO12_S relocation type in kernel module
>          RISC-V: Support RVC_BRANCH/JUMP relocation type in kernel modulewq
>          RISC-V: Support ALIGN relocation type in kernel module
>          RISC-V: Support ADD32 relocation type in kernel module
>          RISC-V: Support SUB32 relocation type in kernel module
>          RISC-V: Enable module support in defconfig
>          RISC-V: Add definition of relocation types
> 
>     arch/riscv/Kconfig                  |   8 +
>     arch/riscv/Makefile                 |   8 +
>     arch/riscv/configs/defconfig        |   2 +
>     arch/riscv/include/asm/atomic.h     | 417 +++++++++++++++++++++++-------------
>     arch/riscv/include/asm/barrier.h    |  15 ++
>     arch/riscv/include/asm/cmpxchg.h    | 391 +++++++++++++++++++++++++++------
>     arch/riscv/include/asm/fence.h      |  12 ++
>     arch/riscv/include/asm/ftrace.h     |  56 +++++
>     arch/riscv/include/asm/module.h     | 113 ++++++++++
>     arch/riscv/include/asm/spinlock.h   |  29 +--
>     arch/riscv/include/uapi/asm/elf.h   |   7 +
>     arch/riscv/kernel/Makefile          |   6 +-
>     arch/riscv/kernel/ftrace.c          | 175 ++++++++++++++-
>     arch/riscv/kernel/mcount-dyn.S      | 239 +++++++++++++++++++++
>     arch/riscv/kernel/mcount.S          |  22 +-
>     arch/riscv/kernel/module-sections.c | 156 ++++++++++++++
>     arch/riscv/kernel/module.c          | 179 +++++++++++++++-
>     arch/riscv/kernel/module.lds        |   8 +
>     arch/riscv/kernel/stacktrace.c      |   6 +
>     scripts/recordmcount.pl             |   5 +
>     20 files changed, 1601 insertions(+), 253 deletions(-)
>     create mode 100644 arch/riscv/include/asm/fence.h
>     create mode 100644 arch/riscv/include/asm/module.h
>     create mode 100644 arch/riscv/kernel/mcount-dyn.S
>     create mode 100644 arch/riscv/kernel/module-sections.c
>     create mode 100644 arch/riscv/kernel/module.lds
> 
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