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* Merge tag 'riscv-for-linus-6.4-mw1' of ↵Linus Torvalds2023-04-282-0/+87
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux Pull RISC-V updates from Palmer Dabbelt: - Support for runtime detection of the Svnapot extension - Support for Zicboz when clearing pages - We've moved to GENERIC_ENTRY - Support for !MMU on rv32 systems - The linear region is now mapped via huge pages - Support for building relocatable kernels - Support for the hwprobe interface - Various fixes and cleanups throughout the tree * tag 'riscv-for-linus-6.4-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: (57 commits) RISC-V: hwprobe: Explicity check for -1 in vdso init RISC-V: hwprobe: There can only be one first riscv: Allow to downgrade paging mode from the command line dt-bindings: riscv: add sv57 mmu-type RISC-V: hwprobe: Remove __init on probe_vendor_features() riscv: Use --emit-relocs in order to move .rela.dyn in init riscv: Check relocations at compile time powerpc: Move script to check relocations at compile time in scripts/ riscv: Introduce CONFIG_RELOCATABLE riscv: Move .rela.dyn outside of init to avoid empty relocations riscv: Prepare EFI header for relocatable kernels riscv: Unconditionnally select KASAN_VMALLOC if KASAN riscv: Fix ptdump when KASAN is enabled riscv: Fix EFI stub usage of KASAN instrumented strcmp function riscv: Move DTB_EARLY_BASE_VA to the kernel address space riscv: Rework kasan population functions riscv: Split early and final KASAN population functions riscv: Use PUD/P4D/PGD pages for the linear mapping riscv: Move the linear mapping creation in its own function riscv: Get rid of riscv_pfn_base variable ...
| * RISC-V: hwprobe: Support probing of misaligned access performanceEvan Green2023-04-181-0/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This allows userspace to select various routines to use based on the performance of misaligned access on the target hardware. Rather than adding DT bindings, this change taps into the alternatives mechanism used to probe CPU errata. Add a new function pointer alongside the vendor-specific errata_patch_func() that probes for desirable errata (otherwise known as "features"). Unlike the errata_patch_func(), this function is called on each CPU as it comes up, so it can save feature information per-CPU. The T-head C906 has fast unaligned access, both as defined by GCC [1], and in performing a basic benchmark, which determined that byte copies are >50% slower than a misaligned word copy of the same data size (source for this test at [2]): bytecopy size f000 count 50000 offset 0 took 31664899 us wordcopy size f000 count 50000 offset 0 took 5180919 us wordcopy size f000 count 50000 offset 1 took 13416949 us [1] https://github.com/gcc-mirror/gcc/blob/master/gcc/config/riscv/riscv.cc#L353 [2] https://pastebin.com/EPXvDHSW Co-developed-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Evan Green <evan@rivosinc.com> Reviewed-by: Heiko Stuebner <heiko.stuebner@vrull.eu> Tested-by: Heiko Stuebner <heiko.stuebner@vrull.eu> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Paul Walmsley <paul.walmsley@sifive.com> Link: https://lore.kernel.org/r/20230407231103.2622178-5-evan@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
| * RISC-V: hwprobe: Add support for RISCV_HWPROBE_BASE_BEHAVIOR_IMAEvan Green2023-04-181-0/+24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | We have an implicit set of base behaviors that userspace depends on, which are mostly defined in various ISA specifications. Co-developed-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Evan Green <evan@rivosinc.com> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Heiko Stuebner <heiko.stuebner@vrull.eu> Tested-by: Heiko Stuebner <heiko.stuebner@vrull.eu> Reviewed-by: Paul Walmsley <paul.walmsley@sifive.com> Link: https://lore.kernel.org/r/20230407231103.2622178-4-evan@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
| * RISC-V: Add a syscall for HW probingEvan Green2023-04-182-0/+42
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We don't have enough space for these all in ELF_HWCAP{,2} and there's no system call that quite does this, so let's just provide an arch-specific one to probe for hardware capabilities. This currently just provides m{arch,imp,vendor}id, but with the key-value pairs we can pass more in the future. Co-developed-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Evan Green <evan@rivosinc.com> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Heiko Stuebner <heiko.stuebner@vrull.eu> Tested-by: Heiko Stuebner <heiko.stuebner@vrull.eu> Reviewed-by: Paul Walmsley <paul.walmsley@sifive.com> Link: https://lore.kernel.org/r/20230407231103.2622178-3-evan@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
* | riscv: Move early dtb mapping into the fixmap regionAlexandre Ghiti2023-04-131-3/+3
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | riscv establishes 2 virtual mappings: - early_pg_dir maps the kernel which allows to discover the system memory - swapper_pg_dir installs the final mapping (linear mapping included) We used to map the dtb in early_pg_dir using DTB_EARLY_BASE_VA, and this mapping was not carried over in swapper_pg_dir. It happens that early_init_fdt_scan_reserved_mem() must be called before swapper_pg_dir is setup otherwise we could allocate reserved memory defined in the dtb. And this function initializes reserved_mem variable with addresses that lie in the early_pg_dir dtb mapping: when those addresses are reused with swapper_pg_dir, this mapping does not exist and then we trap. The previous "fix" was incorrect as early_init_fdt_scan_reserved_mem() must be called before swapper_pg_dir is set up otherwise we could allocate in reserved memory defined in the dtb. So move the dtb mapping in the fixmap region which is established in early_pg_dir and handed over to swapper_pg_dir. Fixes: 922b0375fc93 ("riscv: Fix memblock reservation for device tree blob") Fixes: 8f3a2b4a96dc ("RISC-V: Move DT mapping outof fixmap") Fixes: 50e63dd8ed92 ("riscv: fix reserved memory setup") Reported-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/all/f8e67f82-103d-156c-deb0-d6d6e2756f5e@microchip.com/ Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Tested-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20230329081932.79831-2-alexghiti@rivosinc.com Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
* Documentation: riscv: fix insufficient list item indentConor Dooley2023-02-141-4/+4
| | | | | | | | | | | | | When adding the ISA string ordering rules, I didn't sufficiently indent one of the list items. Reported-by: kernel test robot <lkp@intel.com> Link: https://lore.kernel.org/linux-doc/202301300743.bp7Dpazv-lkp@intel.com/ Fixes: f07b2b3f9d47 ("Documentation: riscv: add a section about ISA string ordering in /proc/cpuinfo") Signed-off-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com> Link: https://lore.kernel.org/r/20230129235701.2393241-1-conor@kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
* Merge patch series "Putting some basic order on isa extension lists"Palmer Dabbelt2023-01-191-0/+42
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This cleans up the ISA string handling to more closely match a version of the ISA spec. This is visible in /proc/cpuinfo and the ordering changes may break something in userspace, but these orderings have changed before without issues so with any luck that's still the case. This also adds documentation so userspace has a better idea of what is intended when it comes to compatibility for /proc/cpuinfo, which should help everyone as this will likely keep changing. * b4-shazam-merge: Documentation: riscv: add a section about ISA string ordering in /proc/cpuinfo RISC-V: resort all extensions in consistent orders RISC-V: clarify ISA string ordering rules in cpu.c Link: https://lore.kernel.org/r/20221205144525.2148448-1-conor.dooley@microchip.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
| * Documentation: riscv: add a section about ISA string ordering in /proc/cpuinfoConor Dooley2023-01-171-0/+42
| | | | | | | | | | | | | | | | | | | | | | | | The RISC-V specs are permissive in what they allow as the ISA string, but how we output this to userspace in /proc/cpuinfo is quasi uABI. Formalise this as part of the uABI, by documenting the list of rules we use at this point in time. Signed-off-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20221205144525.2148448-4-conor.dooley@microchip.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
* | Merge tag 'riscv-for-linus-6.2-mw1' of ↵Linus Torvalds2022-12-141-8/+14
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux Pull RISC-V updates from Palmer Dabbelt: - Support for the T-Head PMU via the perf subsystem - ftrace support for rv32 - Support for non-volatile memory devices - Various fixes and cleanups * tag 'riscv-for-linus-6.2-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: (52 commits) Documentation: RISC-V: patch-acceptance: s/implementor/implementer Documentation: RISC-V: Mention the UEFI Standards Documentation: RISC-V: Allow patches for non-standard behavior Documentation: RISC-V: Fix a typo in patch-acceptance riscv: Fixup compile error with !MMU riscv: Fix P4D_SHIFT definition for 3-level page table mode riscv: Apply a static assert to riscv_isa_ext_id RISC-V: Add some comments about the shadow and overflow stacks RISC-V: Align the shadow stack RISC-V: Ensure Zicbom has a valid block size RISC-V: Introduce riscv_isa_extension_check RISC-V: Improve use of isa2hwcap[] riscv: Don't duplicate _ALTERNATIVE_CFG* macros riscv: alternatives: Drop the underscores from the assembly macro names riscv: alternatives: Don't name unused macro parameters riscv: Don't duplicate __ALTERNATIVE_CFG in __ALTERNATIVE_CFG_2 riscv: mm: call best_map_size many times during linear-mapping riscv: Move cast inside kernel_mapping_[pv]a_to_[vp]a riscv: Fix crash during early errata patching riscv: boot: add zstd support ...
| * | Documentation: RISC-V: patch-acceptance: s/implementor/implementerPalmer Dabbelt2022-12-131-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Implementor does appear to be a word, but it's not very common. Suggested-by: Conor Dooley <conor@kernel.org> Reviewed-by: Anup Patel <anup@brainfault.org> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20221207020815.16214-5-palmer@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
| * | Documentation: RISC-V: Mention the UEFI StandardsPalmer Dabbelt2022-12-131-3/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The current patch acceptance policy requires that specifications are approved by the RISC-V foundation, but we rely on external specifications as well. This explicitly calls out the UEFI specifications that we're starting to depend on. Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Atish Patra <atishp@rivosinc.com> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20221207020815.16214-4-palmer@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
| * | Documentation: RISC-V: Allow patches for non-standard behaviorPalmer Dabbelt2022-12-131-4/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The patch acceptance policy forbids accepting support for non-standard behavior. This policy was written in order to both steer implementers towards the standards and to avoid coupling the upstream kernel too tightly to vendor-specific features. Those were good goals, but in practice the policy just isn't working: every RISC-V system we have needs vendor-specific behavior in the kernel and we end up taking that support which violates the policy. That's confusing for contributors, which is the main reason we have a written policy in the first place. So let's just start taking code for vendor-defined behavior. Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com> Link: https://lore.kernel.org/all/alpine.DEB.2.21.999.2211181027590.4480@utopia.booyaka.com/ [Palmer: merge in Paul's suggestions] Link: https://lore.kernel.org/r/20221207020815.16214-3-palmer@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
| * | Documentation: RISC-V: Fix a typo in patch-acceptancePalmer Dabbelt2022-12-131-1/+1
| |/ | | | | | | | | | | | | | | I just stumbled on this when modifying the docs. Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20221207020815.16214-2-palmer@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
* / Documentation: riscv: Document the sv57 VM layoutBjörn Töpel2022-11-211-0/+36
|/ | | | | | | | | | | RISC-V has been supporting the "sv57" address translation mode for a while, but is has not been added to the VM layout documentation. Let us fix that. Signed-off-by: Björn Töpel <bjorn@rivosinc.com> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/20221118171556.1612190-1-bjorn@kernel.org Signed-off-by: Jonathan Corbet <corbet@lwn.net>
* doc: RISC-V: Document that misaligned accesses are supportedPalmer Dabbelt2022-10-122-0/+7
| | | | | | | | | | | | The RISC-V ISA manual used to mandate that misaligned accesses were supported in user mode, but that requirement was removed in 2018 via riscv-isa-manual commit 61cadb9 ("Provide new description of misaligned load/store behavior compatible with privileged architecture."). Since the Linux uABI was already frozen at that point it's just been demoted to part of the uABI, but that was never written down. Link: https://lore.kernel.org/r/20220728210715.17214-1-palmer@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
* Documentation: riscv: Add sv48 description to VM layoutAlexandre Ghiti2022-06-011-0/+36
| | | | | | | | sv48 was just introduced, so add its virtual memory layout to the documentation. Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
* Documentation: riscv: remove non-existent directory from table of contentsBagas Sanjaya2022-03-311-1/+0
| | | | | | | | | | | | | This subdir no longer exists: it was there to document some of the quirks and paths forward for handling them, but those have been dealt with as of Atish's recent patch set. Fixes: 23b1f18326ec ("Documentation: riscv: Remove the old documentation") Link: https://lore.kernel.org/linux-next/20220329133412.591d6882@canb.auug.org.au/ Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com> [Palmer: commit text] Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
* Documentation: riscv: Remove the old documentationAtish Patra2022-03-211-255/+0
| | | | | | | | | | | | | | The existing pmu documentation describes the limitation of perf infrastructure in RISC-V ISA and limited feature set of perf in RISC-V. However, SBI PMU extension and sscofpmf extension(ISA extension) allows to implement most of the required features of perf. Remove the old documentation which is not accurate anymore. Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Atish Patra <atish.patra@wdc.com> Signed-off-by: Atish Patra <atishp@rivosinc.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
* riscv: Move KASAN mapping next to the kernel mappingAlexandre Ghiti2022-01-191-6/+6
| | | | | | | | | | Now that KASAN_SHADOW_OFFSET is defined at compile time as a config, this value must remain constant whatever the size of the virtual address space, which is only possible by pushing this region at the end of the address space next to the kernel mapping. Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
* riscv: Ensure BPF_JIT_REGION_START aligned with PMD sizeJisheng Zhang2021-06-181-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Andreas reported commit fc8504765ec5 ("riscv: bpf: Avoid breaking W^X") breaks booting with one kind of defconfig, I reproduced a kernel panic with the defconfig: [ 0.138553] Unable to handle kernel paging request at virtual address ffffffff81201220 [ 0.139159] Oops [#1] [ 0.139303] Modules linked in: [ 0.139601] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.13.0-rc5-default+ #1 [ 0.139934] Hardware name: riscv-virtio,qemu (DT) [ 0.140193] epc : __memset+0xc4/0xfc [ 0.140416] ra : skb_flow_dissector_init+0x1e/0x82 [ 0.140609] epc : ffffffff8029806c ra : ffffffff8033be78 sp : ffffffe001647da0 [ 0.140878] gp : ffffffff81134b08 tp : ffffffe001654380 t0 : ffffffff81201158 [ 0.141156] t1 : 0000000000000002 t2 : 0000000000000154 s0 : ffffffe001647dd0 [ 0.141424] s1 : ffffffff80a43250 a0 : ffffffff81201220 a1 : 0000000000000000 [ 0.141654] a2 : 000000000000003c a3 : ffffffff81201258 a4 : 0000000000000064 [ 0.141893] a5 : ffffffff8029806c a6 : 0000000000000040 a7 : ffffffffffffffff [ 0.142126] s2 : ffffffff81201220 s3 : 0000000000000009 s4 : ffffffff81135088 [ 0.142353] s5 : ffffffff81135038 s6 : ffffffff8080ce80 s7 : ffffffff80800438 [ 0.142584] s8 : ffffffff80bc6578 s9 : 0000000000000008 s10: ffffffff806000ac [ 0.142810] s11: 0000000000000000 t3 : fffffffffffffffc t4 : 0000000000000000 [ 0.143042] t5 : 0000000000000155 t6 : 00000000000003ff [ 0.143220] status: 0000000000000120 badaddr: ffffffff81201220 cause: 000000000000000f [ 0.143560] [<ffffffff8029806c>] __memset+0xc4/0xfc [ 0.143859] [<ffffffff8061e984>] init_default_flow_dissectors+0x22/0x60 [ 0.144092] [<ffffffff800010fc>] do_one_initcall+0x3e/0x168 [ 0.144278] [<ffffffff80600df0>] kernel_init_freeable+0x1c8/0x224 [ 0.144479] [<ffffffff804868a8>] kernel_init+0x12/0x110 [ 0.144658] [<ffffffff800022de>] ret_from_exception+0x0/0xc [ 0.145124] ---[ end trace f1e9643daa46d591 ]--- After some investigation, I think I found the root cause: commit 2bfc6cd81bd ("move kernel mapping outside of linear mapping") moves BPF JIT region after the kernel: | #define BPF_JIT_REGION_START PFN_ALIGN((unsigned long)&_end) The &_end is unlikely aligned with PMD size, so the front bpf jit region sits with part of kernel .data section in one PMD size mapping. But kernel is mapped in PMD SIZE, when bpf_jit_binary_lock_ro() is called to make the first bpf jit prog ROX, we will make part of kernel .data section RO too, so when we write to, for example memset the .data section, MMU will trigger a store page fault. To fix the issue, we need to ensure the BPF JIT region is PMD size aligned. This patch acchieve this goal by restoring the BPF JIT region to original position, I.E the 128MB before kernel .text section. The modification to kasan_init.c is inspired by Alexandre. Fixes: fc8504765ec5 ("riscv: bpf: Avoid breaking W^X") Reported-by: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: Jisheng Zhang <jszhang@kernel.org> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
* Documentation: riscv: Add documentation that describes the VM layoutAlexandre Ghiti2021-04-262-0/+64
| | | | | | | | | This new document presents the RISC-V virtual memory layout and is based one the x86 one: it describes the different limits of the different regions of the virtual address space. Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
* docs: archis: add a per-architecture features listMauro Carvalho Chehab2020-12-032-0/+5
| | | | | | | | | Add a feature list matrix for each architecture to their respective Kernel books. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Link: https://lore.kernel.org/r/9c39d4dd93e05c0008205527d2c3450912f029ed.1606748711.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <corbet@lwn.net>
* Merge tag 'docs-5.6' of git://git.lwn.net/linuxLinus Torvalds2020-01-291-2/+2
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull documentation updates from Jonathan Corbet: "It has been a relatively quiet cycle for documentation, but there's still a couple of things of note: - Conversion of the NFS documentation to RST - A new document on how to help with documentation (and a maintainer profile entry too) Plus the usual collection of typo fixes, etc" * tag 'docs-5.6' of git://git.lwn.net/linux: (40 commits) docs: filesystems: add overlayfs to index.rst docs: usb: remove some broken references scripts/find-unused-docs: Fix massive false positives docs: nvdimm: use ReST notation for subsection zram: correct documentation about sysfs node of huge page writeback Documentation: zram: various fixes in zram.rst Add a maintainer entry profile for documentation Add a document on how to contribute to the documentation docs: Keep up with the location of NoUri Documentation: Call out example SYM_FUNC_* usage as x86-specific Documentation: nfs: fault_injection: convert to ReST Documentation: nfs: pnfs-scsi-server: convert to ReST Documentation: nfs: convert pnfs-block-server to ReST Documentation: nfs: idmapper: convert to ReST Documentation: convert nfsd-admin-interfaces to ReST Documentation: nfs-rdma: convert to ReST Documentation: nfsroot.rst: COSMETIC: refill a paragraph Documentation: nfsroot.txt: convert to ReST Documentation: convert nfs.txt to ReST Documentation: filesystems: convert vfat.txt to RST ...
| * RISC-V: Typo fixes in image header and documentation.Atish Patra2019-12-191-2/+2
| | | | | | | | | | | | | | | | | | | | | | There are some typos in boot image header and riscv boot documentation. Fix the typos. Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com> Link: https://lore.kernel.org/r/20191009010637.9955-1-atish.patra@wdc.com Signed-off-by: Jonathan Corbet <corbet@lwn.net>
* | Documentation: riscv: add patch acceptance guidelinesPaul Walmsley2020-01-042-0/+36
|/ | | | | | | | | | | | | | | | | | | | | | | | | | 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: Paul Walmsley <paul.walmsley@sifive.com> Reviewed-by: Palmer 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>
* riscv-docs: correct the sequence of the magic number 2 since it's little endianChester Lin2019-10-031-1/+1
| | | | | | | | Correct the sequence of the magic number 2 since it's little endian. Signed-off-by: Chester Lin <clin@suse.com> Reviewed-by: Paul Walmsley <paul.walmsley@sifive.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
* Merge tag 'docs-5.4' of git://git.lwn.net/linuxLinus Torvalds2019-09-172-14/+26
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull documentation updates from Jonathan Corbet: "It's a somewhat calmer cycle for docs this time, as the churn of the mass RST conversion is happily mostly behind us. - A new document on reproducible builds. - We finally got around to zapping the documentation for hardware support that was removed in 2004; one doesn't want to rush these things. - The usual assortment of fixes, typo corrections, etc" * tag 'docs-5.4' of git://git.lwn.net/linux: (67 commits) Documentation: kbuild: Add document about reproducible builds docs: printk-formats: Stop encouraging use of unnecessary %h[xudi] and %hh[xudi] Documentation: Add "earlycon=sbi" to the admin guide doc:lock: remove reference to clever use of read-write lock devices.txt: improve entry for comedi (char major 98) docs: mtd: Update spi nor reference driver doc: arm64: fix grammar dtb placed in no attributes region Documentation: sysrq: don't recommend 'S' 'U' before 'B' mailmap: Update email address for Quentin Perret docs: ftrace: clarify when tracing is disabled by the trace file docs: process: fix broken link Documentation/arm/samsung-s3c24xx: Remove stray U+FEFF character to fix title Documentation/arm/sa1100/assabet: Fix 'make assabet_defconfig' command Documentation/arm/sa1100: Remove some obsolete documentation docs/zh_CN: update Chinese howto.rst for latexdocs making Documentation: virt: Fix broken reference to virt tree's index docs: Fix typo on pull requests guide kernel-doc: Allow anonymous enum Documentation: sphinx: Don't parse socket() as identifier reference Documentation: sphinx: Add missing comma to list of strings ...
| * docs: riscv: convert boot-image-header.txt to ReSTMauro Carvalho Chehab2019-07-312-14/+26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Convert this small file to ReST format by: - Using a proper markup for the document title; - marking a code block as such; - use tags for Author and date; - use tables for bit map fields. While here, fix a broken reference for a document with is planned but is not here yet. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Reviewed-by: Atish Patra <atish.patra@wdc.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
* | riscv: modify the Image header to improve compatibility with the ARM64 headerPaul Walmsley2019-09-131-6/+7
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | Part of the intention during the definition of the RISC-V kernel image header was to lay the groundwork for a future merge with the ARM64 image header. One error during my original review was not noticing that the RISC-V header's "magic" field was at a different size and position than the ARM64's "magic" field. If the existing ARM64 Image header parsing code were to attempt to parse an existing RISC-V kernel image header format, it would see a magic number 0. This is undesirable, since it's our intention to align as closely as possible with the ARM64 header format. Another problem was that the original "res3" field was not being initialized correctly to zero. Address these issues by creating a 32-bit "magic2" field in the RISC-V header which matches the ARM64 "magic" field. RISC-V binaries will store "RSC\x05" in this field. The intention is that the use of the existing 64-bit "magic" field in the RISC-V header will be deprecated over time. Increment the minor version number of the file format to indicate this change, and update the documentation accordingly. Fix the assembler directives in head.S to ensure that reserved fields are properly zero-initialized. Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com> Reported-by: Palmer Dabbelt <palmer@sifive.com> Reviewed-by: Palmer Dabbelt <palmer@sifive.com> Cc: Atish Patra <atish.patra@wdc.com> Cc: Karsten Merker <merker@debian.org> Link: https://lore.kernel.org/linux-riscv/194c2f10c9806720623430dbf0cc59a965e50448.camel@wdc.com/T/#u Link: https://lore.kernel.org/linux-riscv/mhng-755b14c4-8f35-4079-a7ff-e421fd1b02bc@palmer-si-x1e/T/#t
* Merge tag 'riscv/for-v5.3-rc1' of ↵Linus Torvalds2019-07-181-0/+50
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux Pull RISC-V updates from Paul Walmsley: - Hugepage support - "Image" header support for RISC-V kernel binaries, compatible with the current ARM64 "Image" header - Initial page table setup now split into two stages - CONFIG_SOC support (starting with SiFive SoCs) - Avoid reserving memory between RAM start and the kernel in setup_bootmem() - Enable high-res timers and dynamic tick in the RV64 defconfig - Remove long-deprecated gate area stubs - MAINTAINERS updates to switch to the newly-created shared RISC-V git tree, and to fix a get_maintainers.pl issue for patches involving SiFive E-mail addresses Also, one integration fix to resolve a build problem introduced during in the v5.3-rc1 merge window: - Fix build break after macro-to-function conversion in asm-generic/cacheflush.h * tag 'riscv/for-v5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: riscv: fix build break after macro-to-function conversion in generic cacheflush.h RISC-V: Add an Image header that boot loader can parse. RISC-V: Setup initial page tables in two stages riscv: remove free_initrd_mem riscv: ccache: Remove unused variable riscv: Introduce huge page support for 32/64bit kernel x86, arm64: Move ARCH_WANT_HUGE_PMD_SHARE config in arch/Kconfig RISC-V: Fix memory reservation in setup_bootmem() riscv: defconfig: enable SOC_SIFIVE riscv: select SiFive platform drivers with SOC_SIFIVE arch: riscv: add config option for building SiFive's SoC resource riscv: Remove gate area stubs MAINTAINERS: change the arch/riscv git tree to the new shared tree MAINTAINERS: don't automatically patches involving SiFive to the linux-riscv list RISC-V: defconfig: Enable NO_HZ_IDLE and HIGH_RES_TIMERS
| * RISC-V: Add an Image header that boot loader can parse.Atish Patra2019-07-111-0/+50
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently, the last stage boot loaders such as U-Boot can accept only uImage which is an unnecessary additional step in automating boot process. Add an image header that boot loader understands and boot Linux from flat Image directly. This header is based on ARM64 boot image header and provides an opportunity to combine both ARM64 & RISC-V image headers in future. Also make sure that PE/COFF header can co-exist in the same image so that EFI stub can be supported for RISC-V in future. EFI specification needs PE/COFF image header in the beginning of the kernel image in order to load it as an EFI application. In order to support EFI stub, code0 should be replaced with "MZ" magic string and res4(at offset 0x3c) should point to the rest of the PE/COFF header (which will be added during EFI support). Tested on both QEMU and HiFive Unleashed using OpenSBI + U-Boot + Linux. Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Karsten Merker <merker@debian.org> Tested-by: Karsten Merker <merker@debian.org> (QEMU+OpenSBI+U-Boot) Tested-by: Kevin Hilman <khilman@baylibre.com> (OpenSBI + U-Boot + Linux) [paul.walmsley@sifive.com: fixed whitespace in boot-image-header.txt; converted structure comment to kernel-doc format and added some detail] Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
* | docs: add arch doc directories to the indexMauro Carvalho Chehab2019-07-151-2/+0
| | | | | | | | | | | | | | | | Now that several arch documents were converted to ReST, add their indexes to Documentation/index.rst and remove the :orphan: from them. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
* | docs: riscv: convert docs to ReST and rename to *.rstMauro Carvalho Chehab2019-06-142-46/+69
|/ | | | | | | | | | | | | | The conversion here is trivial: - Adjust the document title's markup - Do some whitespace alignment; - mark literal blocks; - Use ReST way to markup indented lists. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
* perf: riscv: Add Document for Future Porting GuideAlan Kao2018-06-041-0/+249
Reviewed-by: Alex Solomatnikov <sols@sifive.com> Cc: Nick Hu <nickhu@andestech.com> Cc: Greentime Hu <greentime@andestech.com> Signed-off-by: Alan Kao <alankao@andestech.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
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