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The LoongArch architecture is quite different from other architectures.
When the allocating of KFENCE itself is done, it is mapped to the direct
mapping configuration window [1] by default on LoongArch. It means that
it is not possible to use the page table mapped mode which required by
the KFENCE system and therefore it should be remapped to the appropriate
region.
This patch adds architecture specific implementation details for KFENCE.
In particular, this implements the required interface in <asm/kfence.h>.
Tested this patch by running the testcases and all passed.
[1] https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#virtual-address-space-and-address-translation-mode
Signed-off-by: Enze Li <lienze@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Currently, arch_stack_walk() can only get the full stack information
including NMI. This is because the implementation of arch_stack_walk()
is forced to ignore the information passed by the regs parameter and use
the current stack information instead.
For some detection systems like KFENCE, only partial stack information
is needed. In particular, the stack frame where the interrupt occurred.
To support KFENCE, this patch modifies the implementation of the
arch_stack_walk() function so that if this function is called with the
regs argument passed, it retains all the stack information in regs and
uses it to provide accurate information.
Before this patch:
[ 1.531195 ] ==================================================================
[ 1.531442 ] BUG: KFENCE: out-of-bounds read in stack_trace_save_regs+0x48/0x6c
[ 1.531442 ]
[ 1.531900 ] Out-of-bounds read at 0xffff800012267fff (1B left of kfence-#12):
[ 1.532046 ] stack_trace_save_regs+0x48/0x6c
[ 1.532169 ] kfence_report_error+0xa4/0x528
[ 1.532276 ] kfence_handle_page_fault+0x124/0x270
[ 1.532388 ] no_context+0x50/0x94
[ 1.532453 ] do_page_fault+0x1a8/0x36c
[ 1.532524 ] tlb_do_page_fault_0+0x118/0x1b4
[ 1.532623 ] test_out_of_bounds_read+0xa0/0x1d8
[ 1.532745 ] kunit_generic_run_threadfn_adapter+0x1c/0x28
[ 1.532854 ] kthread+0x124/0x130
[ 1.532922 ] ret_from_kernel_thread+0xc/0xa4
<snip>
After this patch:
[ 1.320220 ] ==================================================================
[ 1.320401 ] BUG: KFENCE: out-of-bounds read in test_out_of_bounds_read+0xa8/0x1d8
[ 1.320401 ]
[ 1.320898 ] Out-of-bounds read at 0xffff800012257fff (1B left of kfence-#10):
[ 1.321134 ] test_out_of_bounds_read+0xa8/0x1d8
[ 1.321264 ] kunit_generic_run_threadfn_adapter+0x1c/0x28
[ 1.321392 ] kthread+0x124/0x130
[ 1.321459 ] ret_from_kernel_thread+0xc/0xa4
<snip>
Suggested-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Enze Li <lienze@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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According to LoongArch documentations, there are two types of address
translation modes: direct mapped address translation mode (DMW mode) and
page table mapped address translation mode (TLB mode).
Currently, virt_to_page() only supports direct mapped mode. This patch
determines which mode is used, and adds corresponding handling functions
for both modes.
For more details on the two modes, see [1].
[1] https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#virtual-address-space-and-address-translation-mode
Signed-off-by: Enze Li <lienze@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Add ARCH_HAS_KCOV and HAVE_GCC_PLUGINS to the LoongArch Kconfig. And
also disable instrumentation of vdso.
Signed-off-by: Feiyang Chen <chenfeiyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Provide kaslr_offset() to get the kernel offset when KASLR is enabled.
Signed-off-by: Feiyang Chen <chenfeiyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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KGDB is intended to be used as a source level debugger for the Linux
kernel. It is used along with gdb to debug a Linux kernel. GDB can be
used to "break in" to the kernel to inspect memory, variables and regs
similar to the way an application developer would use GDB to debug an
application. KDB is a frontend of KGDB which is similar to GDB.
By now, in addition to the generic KGDB features, the LoongArch KGDB
implements the following features:
- Hardware breakpoints/watchpoints;
- Software single-step support for KDB.
Signed-off-by: Qing Zhang <zhangqing@loongson.cn> # Framework & CoreFeature
Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn> # BreakPoint & SingleStep
Signed-off-by: Hui Li <lihui@loongson.cn> # Some Minor Improvements
Signed-off-by: Randy Dunlap <rdunlap@infradead.org> # Some Build Error Fixes
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Loongson Binary Translation (LBT) is used to accelerate binary translation,
which contains 4 scratch registers (scr0 to scr3), x86/ARM eflags (eflags)
and x87 fpu stack pointer (ftop).
This patch support kernel to save/restore these registers, handle the LBT
exception and maintain sigcontext.
Signed-off-by: Qi Hu <huqi@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Add LSX and LASX implementations of xor operations, operating on 64
bytes (one L1 cache line) at a time, for a balance between memory
utilization and instruction mix. Huacai confirmed that all future
LoongArch implementations by Loongson (that we care) will likely also
feature 64-byte cache lines, and experiments show no throughput
improvement with further unrolling.
Performance numbers measured during system boot on a 3A5000 @ 2.5GHz:
> 8regs : 12702 MB/sec
> 8regs_prefetch : 10920 MB/sec
> 32regs : 12686 MB/sec
> 32regs_prefetch : 10918 MB/sec
> lsx : 17589 MB/sec
> lasx : 26116 MB/sec
Acked-by: Song Liu <song@kernel.org>
Signed-off-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Allow usage of LSX/LASX in the kernel by extending kernel_fpu_begin()
and kernel_fpu_end().
Reviewed-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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The initial aim is to silence the following objtool warnings:
arch/loongarch/kernel/fpu.o: warning: objtool: _save_fp_context() falls through to next function fault()
arch/loongarch/kernel/fpu.o: warning: objtool: _restore_fp_context() falls through to next function fault()
arch/loongarch/kernel/fpu.o: warning: objtool: _save_lsx_context() falls through to next function fault()
arch/loongarch/kernel/fpu.o: warning: objtool: _restore_lsx_context() falls through to next function fault()
arch/loongarch/kernel/fpu.o: warning: objtool: _save_lasx_context() falls through to next function fault()
arch/loongarch/kernel/fpu.o: warning: objtool: _restore_lasx_context() falls through to next function fault()
Currently, SYM_FUNC_START()/SYM_FUNC_END() defines the symbol 'fault' as
SYM_T_FUNC which is STT_FUNC, the objtool warnings are generated through
the following code:
tools/objtool/include/objtool/check.h:
static inline struct symbol *insn_func(struct instruction *insn)
{
struct symbol *sym = insn->sym;
if (sym && sym->type != STT_FUNC)
sym = NULL;
return sym;
}
tools/objtool/check.c:
static int validate_branch(struct objtool_file *file, struct symbol *func,
struct instruction *insn, struct insn_state state)
{
...
if (func && insn_func(insn) && func != insn_func(insn)->pfunc) {
...
WARN("%s() falls through to next function %s()",
func->name, insn_func(insn)->name);
return 1;
}
...
}
We can see that the fixup can be a local label in the following code:
arch/loongarch/include/asm/asm-extable.h:
.pushsection __ex_table, "a"; \
.balign 4; \
.long ((insn) - .); \
.long ((fixup) - .); \
.short (type); \
.short (data); \
.popsection;
.macro _asm_extable, insn, fixup
__ASM_EXTABLE_RAW(\insn, \fixup, EX_TYPE_FIXUP, 0)
.endm
Like arch/loongarch/lib/*.S, just define the symbol 'fault' as a local
label in fpu.S.
Before:
$ readelf -s arch/loongarch/kernel/fpu.o | awk -F: /fault/'{print $2}'
000000000000053c 8 FUNC GLOBAL DEFAULT 1 fault
After:
$ readelf -s arch/loongarch/kernel/fpu.o | awk -F: /fault/'{print $2}'
000000000000053c 0 NOTYPE LOCAL DEFAULT 1 .L_fpu_fault
Co-developed-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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The {copy, clear}_user function should returns number of bytes that
could not be {copied, cleared}. So, try to {copy, clear} byte by byte
when ld.{d,w,h} and st.{d,w,h} trapped into an exception.
Reviewed-by: WANG Rui <wangrui@loongson.cn>
Signed-off-by: Weihao Li <liweihao@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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On LoongArch system, there is only one page needed for zero page (no
cache synonyms), and there is no COLOR_ZERO_PAGE, so zero_page_mask is
useless and the macro __HAVE_COLOR_ZERO_PAGE is not necessary.
Like other popular architectures, It is simpler to define the zero page
in kernel BSS code segment rather than dynamically allocate.
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Function pcpu_populate_pte() and fixmap_pte() are similar, they populate
one page from kernel address space. And there is confusion between pgd
and p4d in the function fixmap_pte(), such as pgd_none() always returns
zero. This patch introduces a unified function populate_kernel_pte() and
then replaces pcpu_populate_pte() and fixmap_pte().
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Do some code improvements in function pcpu_populate_pte():
1. Add memory allocation failure handling;
2. Replace pgd_populate() with p4d_populate(), it will be useful if
there are four-level page tables.
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Both shm_align_mask and SHMLBA want to avoid cache alias. But they are
inconsistent: shm_align_mask is (PAGE_SIZE - 1) while SHMLBA is SZ_64K,
but PAGE_SIZE is not always equal to SZ_64K.
This may cause problems when shmat() twice. Fix this problem by removing
shm_align_mask and using SHMLBA (strictly SHMLBA - 1) instead.
Reported-by: Jiantao Shan <shanjiantao@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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When I do LTP test, LTP test case ksm06 caused panic at
break_ksm_pmd_entry
-> pmd_leaf (Huge page table but False)
-> pte_present (panic)
The reason is pmd_leaf() is not defined, So like commit 501b81046701
("mips: mm: add p?d_leaf() definitions") add p?d_leaf() definition for
LoongArch.
Fixes: 09cfefb7fa70 ("LoongArch: Add memory management")
Cc: stable@vger.kernel.org
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Hongchen Zhang <zhanghongchen@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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When building with CONFIG_LTO_CLANG_FULL, there are several errors due
to the way that parse_r is defined with an __asm__ statement in a
header:
ld.lld: error: ld-temp.o <inline asm>:105:1: macro 'parse_r' is already defined
.macro parse_r var r
^
This was an issue for arch/mips as well, which was resolved by commit
67512a8cf5a7 ("MIPS: Avoid macro redefinitions").
However, parse_r is unused in arch/loongarch after commit 83d8b38967d2
("LoongArch: Simplify the invtlb wrappers"), so doing the same change
does not make much sense now. Just remove parse_r (and parse_v, which
is also unused) to resolve the redefinition error. If it needs to be
brought back due to an actual use, it should be brought back with the
same changes as the aforementioned arch/mips commit.
Closes: https://github.com/ClangBuiltLinux/linux/issues/1924
Reviewed-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Use bpf_jit_binary_pack_alloc() for memory management of JIT binaries in
RISCV BPF JIT. The bpf_jit_binary_pack_alloc creates a pair of RW and RX
buffers. The JIT writes the program into the RW buffer. When the JIT is
done, the program is copied to the final RX buffer with
bpf_jit_binary_pack_finalize.
Implement bpf_arch_text_copy() and bpf_arch_text_invalidate() for RISCV
JIT as these functions are required by bpf_jit_binary_pack allocator.
Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
Reviewed-by: Song Liu <song@kernel.org>
Reviewed-by: Pu Lehui <pulehui@huawei.com>
Acked-by: Björn Töpel <bjorn@kernel.org>
Tested-by: Björn Töpel <bjorn@rivosinc.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20230831131229.497941-5-puranjay12@gmail.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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The BPF JIT needs to write invalid instructions to RX regions of memory to
invalidate removed BPF programs. This needs a function like memset() that
can work with RX memory.
Implement patch_text_set_nosync() which is similar to text_poke_set() of
x86.
Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
Reviewed-by: Pu Lehui <pulehui@huawei.com>
Acked-by: Björn Töpel <bjorn@kernel.org>
Tested-by: Björn Töpel <bjorn@rivosinc.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20230831131229.497941-4-puranjay12@gmail.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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The patch_insn_write() function currently doesn't work for multiple pages
of instructions, therefore patch_text_nosync() will fail with a page fault
if called with lengths spanning multiple pages.
This commit extends the patch_insn_write() function to support multiple
pages by copying at max 2 pages at a time in a loop. This implementation
is similar to text_poke_copy() function of x86.
Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
Reviewed-by: Pu Lehui <pulehui@huawei.com>
Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Tested-by: Björn Töpel <bjorn@rivosinc.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20230831131229.497941-3-puranjay12@gmail.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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s390x eBPF programs use the following extension to the s390x calling
convention: tail call counter is passed on stack at offset
STK_OFF_TCCNT, which callees otherwise use as scratch space.
Currently trampoline does not respect this and clobbers tail call
counter. This breaks enforcing tail call limits in eBPF programs, which
have trampolines attached to them.
Fix by forwarding a copy of the tail call counter to the original eBPF
program in the trampoline (for fexit), and by restoring it at the end
of the trampoline (for fentry).
Fixes: 528eb2cb87bc ("s390/bpf: Implement arch_prepare_bpf_trampoline()")
Reported-by: Leon Hwang <hffilwlqm@gmail.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230906004448.111674-1-iii@linux.ibm.com
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We can now use arm64 functions to handle the move of the kernel physical
mapping: if KASLR is enabled, we will try to get a random seed from the
firmware, if not possible, the kernel will be moved to a location that
suits its alignment constraints.
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Tested-by: Conor Dooley <conor.dooley@microchip.com>
Tested-by: Song Shuai <songshuaishuai@tinylab.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Tested-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lore.kernel.org/r/20230722123850.634544-6-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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This prepares for riscv to use the same functions to handle the pĥysical
kernel move when KASLR is enabled.
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Conor Dooley <conor.dooley@microchip.com>
Tested-by: Song Shuai <songshuaishuai@tinylab.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Tested-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lore.kernel.org/r/20230722123850.634544-4-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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Dump out the KASLR virtual kernel offset when panic to help debug kernel.
Signed-off-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Tested-by: Conor Dooley <conor.dooley@microchip.com>
Tested-by: Song Shuai <songshuaishuai@tinylab.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Tested-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lore.kernel.org/r/20230722123850.634544-3-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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KASLR implementation relies on a relocatable kernel so that we can move
the kernel mapping.
The seed needed to virtually move the kernel is taken from the device tree,
so we rely on the bootloader to provide a correct seed. Zkr could be used
unconditionnally instead if implemented, but that's for another patch.
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Tested-by: Conor Dooley <conor.dooley@microchip.com>
Tested-by: Song Shuai <songshuaishuai@tinylab.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Tested-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lore.kernel.org/r/20230722123850.634544-2-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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Starting from SPR, the basic uncore PMON information is retrieved from
the discovery table (resides in an MMIO space populated by BIOS). It is
called the discovery method. The existing value of the type->num_boxes
is from the discovery table.
On some SPR variants, there is a firmware bug that makes the value from the
discovery table incorrect. We use the value from the
SPR_MSR_UNC_CBO_CONFIG MSR to replace the one from the discovery table:
38776cc45eb7 ("perf/x86/uncore: Correct the number of CHAs on SPR")
Unfortunately, the SPR_MSR_UNC_CBO_CONFIG isn't available for the EMR
XCC (Always returns 0), but the above firmware bug doesn't impact the
EMR XCC.
Don't let the value from the MSR replace the existing value from the
discovery table.
Fixes: 38776cc45eb7 ("perf/x86/uncore: Correct the number of CHAs on SPR")
Reported-by: Stephane Eranian <eranian@google.com>
Reported-by: Yunying Sun <yunying.sun@intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Yunying Sun <yunying.sun@intel.com>
Link: https://lore.kernel.org/r/20230905134248.496114-1-kan.liang@linux.intel.com
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git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata
Pull ata updates from Damien Le Moal:
- Fix OF include file for ata platform drivers (Rob)
- Simplify various ahci, sata and pata platform drivers using the
function devm_platform_ioremap_resource() (Yangtao)
- Cleanup libata time related argument types (e.g. timeouts values)
(Sergey)
- Cleanup libata code around error handling as all ata drivers now
define a error_handler operation (Hannes and Niklas)
- Remove functions intended for libsas that are in fact unused (Niklas)
- Change the remove device callback of platform drivers to a null
function (Uwe)
- Simplify the pata_imx driver using devm_clk_get_enabled() (Li)
- Remove old and uinused remnants of the ide code in arm, parisc,
powerpc, sparc and m68k architectures and associated drivers
(pata_buddha, pata_falcon and pata_gayle) (Geert)
- Add missing MODULE_DESCRIPTION() in the sata_gemini and pata_ftide010
drivers (me)
- Several fixes for the pata_ep93xx and pata_falcon drivers (Nikita,
Michael)
- Add Elkhart Lake AHCI controller support to the ahci driver (Werner)
- Disable NCQ trim on Micron 1100 drives (Pawel)
* tag 'ata-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata: (60 commits)
ata: libata-core: Disable NCQ_TRIM on Micron 1100 drives
ata: ahci: Add Elkhart Lake AHCI controller
ata: pata_falcon: add data_swab option to byte-swap disk data
ata: pata_falcon: fix IO base selection for Q40
ata: pata_ep93xx: use soc_device_match for UDMA modes
ata: pata_ep93xx: fix error return code in probe
ata: sata_gemini: Add missing MODULE_DESCRIPTION
ata: pata_ftide010: Add missing MODULE_DESCRIPTION
m68k: Remove <asm/ide.h>
ata: pata_gayle: Remove #include <asm/ide.h>
ata: pata_falcon: Remove #include <asm/ide.h>
ata: pata_buddha: Remove #include <asm/ide.h>
asm-generic: Remove ide_iops.h
sparc: Remove <asm/ide.h>
powerpc: Remove <asm/ide.h>
parisc: Remove <asm/ide.h>
ARM: Remove <asm/ide.h>
ata: pata_imx: Use helper function devm_clk_get_enabled()
ata: sata_rcar: Convert to platform remove callback returning void
ata: sata_mv: Convert to platform remove callback returning void
...
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git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull misc fixes from Andrew Morton:
"Seven hotfixes. Four are cc:stable and the remainder pertain to issues
which were introduced in the current merge window"
* tag 'mm-hotfixes-stable-2023-09-05-11-51' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
sparc64: add missing initialization of folio in tlb_batch_add()
mm: memory-failure: use rcu lock instead of tasklist_lock when collect_procs()
revert "memfd: improve userspace warnings for missing exec-related flags".
rcu: dump vmalloc memory info safely
mm/vmalloc: add a safer version of find_vm_area() for debug
tools/mm: fix undefined reference to pthread_once
memcontrol: ensure memcg acquired by id is properly set up
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The only interface that allows drivers establishing
liner mappings is vmem_add_mapping(). It does check
a requested range against allowed limits and a call
to modify_pagetable() with an invalid mapping range
is impossible.
Hence, an attempt to map an address range outside of
the identity mapping or vmemmap array could only be
kernel bug.
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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MAX_DMA_ADDRESS is defined and treated as a physical address,
whereas it should be virtual.
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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Commit 1a10a44dfc1d ("sparc64: implement the new page table range API")
missed initialization of folio variable in tlb_batch_add() which causes
boot tests to crash.
Add missing initialization.
Link: https://lkml.kernel.org/r/20230904174350.GF3223@kernel.org
Fixes: 1a10a44dfc1d ("sparc64: implement the new page table range API")
Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull Kbuild updates from Masahiro Yamada:
- Enable -Wenum-conversion warning option
- Refactor the rpm-pkg target
- Fix scripts/setlocalversion to consider annotated tags for rt-kernel
- Add a jump key feature for the search menu of 'make nconfig'
- Support Qt6 for 'make xconfig'
- Enable -Wformat-overflow, -Wformat-truncation, -Wstringop-overflow,
and -Wrestrict warnings for W=1 builds
- Replace <asm/export.h> with <linux/export.h> for alpha, ia64, and
sparc
- Support DEB_BUILD_OPTIONS=parallel=N for the debian source package
- Refactor scripts/Makefile.modinst and fix some modules_sign issues
- Add a new Kconfig env variable to warn symbols that are not defined
anywhere
- Show help messages of config fragments in 'make help'
* tag 'kbuild-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (62 commits)
kconfig: fix possible buffer overflow
kbuild: Show marked Kconfig fragments in "help"
kconfig: add warn-unknown-symbols sanity check
kbuild: dummy-tools: make MPROFILE_KERNEL checks work on BE
Documentation/llvm: refresh docs
modpost: Skip .llvm.call-graph-profile section check
kbuild: support modules_sign for external modules as well
kbuild: support 'make modules_sign' with CONFIG_MODULE_SIG_ALL=n
kbuild: move more module installation code to scripts/Makefile.modinst
kbuild: reduce the number of mkdir calls during modules_install
kbuild: remove $(MODLIB)/source symlink
kbuild: move depmod rule to scripts/Makefile.modinst
kbuild: add modules_sign to no-{compiler,sync-config}-targets
kbuild: do not run depmod for 'make modules_sign'
kbuild: deb-pkg: support DEB_BUILD_OPTIONS=parallel=N in debian/rules
alpha: remove <asm/export.h>
alpha: replace #include <asm/export.h> with #include <linux/export.h>
ia64: remove <asm/export.h>
ia64: replace #include <asm/export.h> with #include <linux/export.h>
sparc: remove <asm/export.h>
...
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Pull microblaze updates from Michal Simek:
- Cleanup DT headers
- Remove unused zalloc_maybe_bootmem()
- Make virt_to_pfn() a static inline
* tag 'microblaze-v6.6' of git://git.monstr.eu/linux-2.6-microblaze:
microblaze: Make virt_to_pfn() a static inline
microblaze: Remove zalloc_maybe_bootmem()
microblaze: Explicitly include correct DT includes
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Pull OpenRISC updates from Stafford Horne:
- Fixes from me to cleanup all compiler warnings reported under
arch/openrisc
- One cleanup from Linus Walleij to convert pfn macros to static
inlines
* tag 'for-linus' of https://github.com/openrisc/linux:
openrisc: Remove kernel-doc marker from ioremap comment
openrisc: Remove unused tlb_init function
openriac: Remove unused nommu_dump_state function
openrisc: Include cpu.h and switch_to.h for prototypes
openrisc: Add prototype for die to bug.h
openrisc: Add prototype for show_registers to processor.h
openrisc: Declare do_signal function as static
openrisc: Add missing prototypes for assembly called fnctions
openrisc: Make pfn accessors statics inlines
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git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
Pull ARC updates from Vineet Gupta:
- fixes for -Wmissing-prototype warnings
- missing compiler barrier in relaxed atomics
- some uaccess simplification, declutter
- removal of massive glocal struct cpuinfo_arc from bootlog code
- __switch_to consolidation (removal of inline asm variant)
- use GP to cache task pointer (vs. r25)
- misc rework of entry code
* tag 'arc-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: (24 commits)
ARC: boot log: fix warning
arc: Explicitly include correct DT includes
ARC: pt_regs: create seperate type for ecr
ARCv2: entry: rearrange pt_regs slightly
ARC: entry: replace 8 byte ADD.ne with 4 byte ADD2.ne
ARC: entry: replace 8 byte OR with 4 byte BSET
ARC: entry: Add more common chores to EXCEPTION_PROLOGUE
ARC: entry: EV_MachineCheck dont re-read ECR
ARC: entry: ARcompact EV_ProtV to use r10 directly
ARC: entry: rework (non-functional)
ARC: __switch_to: move ksp to thread_info from thread_struct
ARC: __switch_to: asm with dwarf ops (vs. inline asm)
ARC: kernel stack: INIT_THREAD need not setup @init_stack in @ksp
ARC: entry: use gp to cache task pointer (vs. r25)
ARC: boot log: eliminate struct cpuinfo_arc #4: boot log per ISA
ARC: boot log: eliminate struct cpuinfo_arc #3: don't export
ARC: boot log: eliminate struct cpuinfo_arc #2: cache
ARC: boot log: eliminate struct cpuinfo_arc #1: mm
ARCv2: memset: don't prefetch for len == 0 which happens a alot
ARC: uaccess: elide unaliged handling if hardware supports
...
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git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu
Pull m68knommu updates from Greg Ungerer:
"Two changes, one a trivial white space clean up, the other removes the
unnecessary local pcibios_setup() code"
* tag 'm68knommu-for-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu:
m68k: coldfire: dma_timer: ERROR: "foo __init bar" should be "foo __init bar"
m68k/pci: Drop useless pcibios_setup()
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git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux
Pull UML updates from Richard Weinberger:
- Drop 32-bit checksum implementation and re-use it from arch/x86
- String function cleanup
- Fixes for -Wmissing-variable-declarations and -Wmissing-prototypes
builds
* tag 'uml-for-linus-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux:
um: virt-pci: fix missing declaration warning
um: Refactor deprecated strncpy to memcpy
um: fix 3 instances of -Wmissing-prototypes
um: port_kern: fix -Wmissing-variable-declarations
uml: audio: fix -Wmissing-variable-declarations
um: vector: refactor deprecated strncpy
um: use obj-y to descend into arch/um/*/
um: Hard-code the result of 'uname -s'
um: Use the x86 checksum implementation on 32-bit
asm-generic: current: Don't include thread-info.h if building asm
um: Remove unsued extern declaration ldt_host_info()
um: Fix hostaudio build errors
um: Remove strlcpy usage
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git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux
Pull hyperv updates from Wei Liu:
- Support for SEV-SNP guests on Hyper-V (Tianyu Lan)
- Support for TDX guests on Hyper-V (Dexuan Cui)
- Use SBRM API in Hyper-V balloon driver (Mitchell Levy)
- Avoid dereferencing ACPI root object handle in VMBus driver (Maciej
Szmigiero)
- A few misecllaneous fixes (Jiapeng Chong, Nathan Chancellor, Saurabh
Sengar)
* tag 'hyperv-next-signed-20230902' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: (24 commits)
x86/hyperv: Remove duplicate include
x86/hyperv: Move the code in ivm.c around to avoid unnecessary ifdef's
x86/hyperv: Remove hv_isolation_type_en_snp
x86/hyperv: Use TDX GHCI to access some MSRs in a TDX VM with the paravisor
Drivers: hv: vmbus: Bring the post_msg_page back for TDX VMs with the paravisor
x86/hyperv: Introduce a global variable hyperv_paravisor_present
Drivers: hv: vmbus: Support >64 VPs for a fully enlightened TDX/SNP VM
x86/hyperv: Fix serial console interrupts for fully enlightened TDX guests
Drivers: hv: vmbus: Support fully enlightened TDX guests
x86/hyperv: Support hypercalls for fully enlightened TDX guests
x86/hyperv: Add hv_isolation_type_tdx() to detect TDX guests
x86/hyperv: Fix undefined reference to isolation_type_en_snp without CONFIG_HYPERV
x86/hyperv: Add missing 'inline' to hv_snp_boot_ap() stub
hv: hyperv.h: Replace one-element array with flexible-array member
Drivers: hv: vmbus: Don't dereference ACPI root object handle
x86/hyperv: Add hyperv-specific handling for VMMCALL under SEV-ES
x86/hyperv: Add smp support for SEV-SNP guest
clocksource: hyper-v: Mark hyperv tsc page unencrypted in sev-snp enlightened guest
x86/hyperv: Use vmmcall to implement Hyper-V hypercall in sev-snp enlightened guest
drivers: hv: Mark percpu hvcall input arg page unencrypted in SEV-SNP enlightened guest
...
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Vasant reported that kexec() can hang or reset the machine when it tries to
park CPUs via INIT. This happens when the kernel is using extended APIC,
but the present mask has APIC IDs >= 0x100 enumerated.
As extended APIC can only handle 8 bit of APIC ID sending INIT to APIC ID
0x100 sends INIT to APIC ID 0x0. That's the boot CPU which is special on
x86 and INIT causes the system to hang or resets the machine.
Prevent this by sending INIT only to those CPUs which have been booted
once.
Fixes: 45e34c8af58f ("x86/smp: Put CPUs into INIT on shutdown if possible")
Reported-by: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@amd.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/87cyzwjbff.ffs@tglx
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Currently the Kconfig fragments in kernel/configs and arch/*/configs
that aren't used internally aren't discoverable through "make help",
which consists of hard-coded lists of config fragments. Instead, list
all the fragment targets that have a "# Help: " comment prefix so the
targets can be generated dynamically.
Add logic to the Makefile to search for and display the fragment and
comment. Add comments to fragments that are intended to be direct targets.
Signed-off-by: Kees Cook <keescook@chromium.org>
Co-developed-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Dave Hansen:
"The most important fix here adds a missing CPU model to the recent
Gather Data Sampling (GDS) mitigation list to ensure that mitigations
are available on that CPU.
There are also a pair of warning fixes, and closure of a covert
channel that pops up when protection keys are disabled.
Summary:
- Mark all Skylake CPUs as vulnerable to GDS
- Fix PKRU covert channel
- Fix -Wmissing-variable-declarations warning for ia32_xyz_class
- Fix kernel-doc annotation warning"
* tag 'x86-urgent-2023-09-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/fpu/xstate: Fix PKRU covert channel
x86/irq/i8259: Fix kernel-doc annotation warning
x86/speculation: Mark all Skylake CPUs as vulnerable to GDS
x86/audit: Fix -Wmissing-variable-declarations warning for ia32_xyz_class
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git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto fix from Herbert Xu:
"This fixes a random config build failure on powerpc"
* tag 'v6.6-p2' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
crypto: powerpc/chacha20,poly1305-p10 - Add dependency on VSX
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This patch add back the ptrace support with the following fix:
- Define NT_RISCV_CSR and re-number NT_RISCV_VECTOR to prevent
conflicting with gdb's NT_RISCV_CSR.
- Use struct __riscv_v_regset_state to handle ptrace requests
Since gdb does not directly include the note description header in
Linux and has already defined NT_RISCV_CSR as 0x900, we decide to
sync with gdb and renumber NT_RISCV_VECTOR to solve and prevent future
conflicts.
Fixes: 0c59922c769a ("riscv: Add ptrace vector support")
Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Link: https://lore.kernel.org/r/20230825050248.32681-1-andy.chiu@sifive.com
[Palmer: Drop the unused "size" variable in riscv_vr_set().]
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
Pull media updates from Mauro Carvalho Chehab:
- new i2c drivers: ds90ub913, ds90ub953, ds90ub960, dw9719, ds90ub913
- new Intel IVSC MEI drivers
- some Mediatek platform drivers were moved to a common location
- Intel atomisp2 driver is now working with the main ov2680 driver. Due
to that, the atomisp2 ov2680 staging one was removed
- the bttv driver was finally converted to videobuf2 framework. This
was the last one upstream using videobuf version 1 core. We'll likely
remove the old videobuf framework on 6.7
- lots of improvements at atomisp driver: it now works with normal I2C
sensors. Several compile-mode dependecies to select between ISP2400
and ISP2401 are now solved in runtime
- a new ipu-bridge logic was added to work with IVSC MEI drivers
- venus driver gained better support for new VPU versions
- the v4l core async framework has gained lots of improvements and
cleanups
- lots of other cleanups, improvements and driver fixes
* tag 'media/v6.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (358 commits)
media: ivsc: Add ACPI dependency
media: bttv: convert to vb2
media: bttv: use audio defaults for winfast2000
media: bttv: refactor bttv_set_dma()
media: bttv: move vbi_skip/vbi_count out of buffer
media: bttv: remove crop info from bttv_buffer
media: bttv: remove tvnorm field from bttv_buffer
media: bttv: remove format field from bttv_buffer
media: bttv: move do_crop flag out of bttv_fh
media: bttv: copy vbi_fmt from bttv_fh
media: bttv: copy vid fmt/width/height from fh
media: bttv: radio use v4l2_fh instead of bttv_fh
media: bttv: replace BUG with WARN_ON
media: bttv: use video_drvdata to get bttv
media: i2c: rdacm21: Fix uninitialized value
media: coda: Remove duplicated include
media: vivid: fix the racy dev->radio_tx_rds_owner
media: i2c: ccs: Check rules is non-NULL
media: i2c: ds90ub960: Fix PLL config for 1200 MHz CSI rate
media: i2c: ds90ub953: Fix use of uninitialized variables
...
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc driver updates from Greg KH:
"Here is the big set of char/misc and other small driver subsystem
changes for 6.6-rc1.
Stuff all over the place here, lots of driver updates and changes and
new additions. Short summary is:
- new IIO drivers and updates
- Interconnect driver updates
- fpga driver updates and additions
- fsi driver updates
- mei driver updates
- coresight driver updates
- nvmem driver updates
- counter driver updates
- lots of smaller misc and char driver updates and additions
All of these have been in linux-next for a long time with no reported
problems"
* tag 'char-misc-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (267 commits)
nvmem: core: Notify when a new layout is registered
nvmem: core: Do not open-code existing functions
nvmem: core: Return NULL when no nvmem layout is found
nvmem: core: Create all cells before adding the nvmem device
nvmem: u-boot-env:: Replace zero-length array with DECLARE_FLEX_ARRAY() helper
nvmem: sec-qfprom: Add Qualcomm secure QFPROM support
dt-bindings: nvmem: sec-qfprom: Add bindings for secure qfprom
dt-bindings: nvmem: Add compatible for QCM2290
nvmem: Kconfig: Fix typo "drive" -> "driver"
nvmem: Explicitly include correct DT includes
nvmem: add new NXP QorIQ eFuse driver
dt-bindings: nvmem: Add t1023-sfp efuse support
dt-bindings: nvmem: qfprom: Add compatible for MSM8226
nvmem: uniphier: Use devm_platform_get_and_ioremap_resource()
nvmem: qfprom: do some cleanup
nvmem: stm32-romem: Use devm_platform_get_and_ioremap_resource()
nvmem: rockchip-efuse: Use devm_platform_get_and_ioremap_resource()
nvmem: meson-mx-efuse: Convert to devm_platform_ioremap_resource()
nvmem: lpc18xx_otp: Convert to devm_platform_ioremap_resource()
nvmem: brcm_nvram: Use devm_platform_get_and_ioremap_resource()
...
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core updates from Greg KH:
"Here is a small set of driver core updates and additions for 6.6-rc1.
Included in here are:
- stable kernel documentation updates
- class structure const work from Ivan on various subsystems
- kernfs tweaks
- driver core tests!
- kobject sanity cleanups
- kobject structure reordering to save space
- driver core error code handling fixups
- other minor driver core cleanups
All of these have been in linux-next for a while with no reported
problems"
* tag 'driver-core-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (32 commits)
driver core: Call in reversed order in device_platform_notify_remove()
driver core: Return proper error code when dev_set_name() fails
kobject: Remove redundant checks for whether ktype is NULL
kobject: Add sanity check for kset->kobj.ktype in kset_register()
drivers: base: test: Add missing MODULE_* macros to root device tests
drivers: base: test: Add missing MODULE_* macros for platform devices tests
drivers: base: Free devm resources when unregistering a device
drivers: base: Add basic devm tests for platform devices
drivers: base: Add basic devm tests for root devices
kernfs: fix missing kernfs_iattr_rwsem locking
docs: stable-kernel-rules: mention that regressions must be prevented
docs: stable-kernel-rules: fine-tune various details
docs: stable-kernel-rules: make the examples for option 1 a proper list
docs: stable-kernel-rules: move text around to improve flow
docs: stable-kernel-rules: improve structure by changing headlines
base/node: Remove duplicated include
kernfs: attach uuid for every kernfs and report it in fsid
kernfs: add stub helper for kernfs_generic_poll()
x86/resctrl: make pseudo_lock_class a static const structure
x86/MSR: make msr_class a static const structure
...
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull tty/serial driver updates from Greg KH:
"Here is the big set of tty and serial driver changes for 6.6-rc1.
Lots of cleanups in here this cycle, and some driver updates. Short
summary is:
- Jiri's continued work to make the tty code and apis be a bit more
sane with regards to modern kernel coding style and types
- cpm_uart driver updates
- n_gsm updates and fixes
- meson driver updates
- sc16is7xx driver updates
- 8250 driver updates for different hardware types
- qcom-geni driver fixes
- tegra serial driver change
- stm32 driver updates
- synclink_gt driver cleanups
- tty structure size reduction
All of these have been in linux-next this week with no reported
issues. The last bit of cleanups from Jiri and the tty structure size
reduction came in last week, a bit late but as they were just style
changes and size reductions, I figured they should get into this merge
cycle so that others can work on top of them with no merge conflicts"
* tag 'tty-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (199 commits)
tty: shrink the size of struct tty_struct by 40 bytes
tty: n_tty: deduplicate copy code in n_tty_receive_buf_real_raw()
tty: n_tty: extract ECHO_OP processing to a separate function
tty: n_tty: unify counts to size_t
tty: n_tty: use u8 for chars and flags
tty: n_tty: simplify chars_in_buffer()
tty: n_tty: remove unsigned char casts from character constants
tty: n_tty: move newline handling to a separate function
tty: n_tty: move canon handling to a separate function
tty: n_tty: use MASK() for masking out size bits
tty: n_tty: make n_tty_data::num_overrun unsigned
tty: n_tty: use time_is_before_jiffies() in n_tty_receive_overrun()
tty: n_tty: use 'num' for writes' counts
tty: n_tty: use output character directly
tty: n_tty: make flow of n_tty_receive_buf_common() a bool
Revert "tty: serial: meson: Add a earlycon for the T7 SoC"
Documentation: devices.txt: Fix minors for ttyCPM*
Documentation: devices.txt: Remove ttySIOC*
Documentation: devices.txt: Remove ttyIOC*
serial: 8250_bcm7271: improve bcm7271 8250 port
...
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Pull USB / Thunderbolt / PHY driver updates from Greg KH:
"Here is the big set of USB, Thunderbolt, and PHY driver updates for
6.6-rc1. Included in here are:
- PHY driver additions and cleanups
- Thunderbolt minor additions and fixes
- USB MIDI 2 gadget support added
- dwc3 driver updates and additions
- Removal of some old USB wireless code that was missed when that
codebase was originally removed a few years ago, cleaning up some
core USB code paths
- USB core potential use-after-free fixes that syzbot from different
people/groups keeps tripping over
- typec updates and additions
- gadget fixes and cleanups
- loads of smaller USB core and driver cleanups all over the place
Full details are in the shortlog. All of these have been in linux-next
for a while with no reported problems"
* tag 'usb-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (154 commits)
platform/chrome: cros_ec_typec: Configure Retimer cable type
tcpm: Avoid soft reset when partner does not support get_status
usb: typec: tcpm: reset counter when enter into unattached state after try role
usb: typec: tcpm: set initial svdm version based on pd revision
USB: serial: option: add FOXCONN T99W368/T99W373 product
USB: serial: option: add Quectel EM05G variant (0x030e)
usb: dwc2: add pci_device_id driver_data parse support
usb: gadget: remove max support speed info in bind operation
usb: gadget: composite: cleanup function config_ep_by_speed_and_alt()
usb: gadget: config: remove max speed check in usb_assign_descriptors()
usb: gadget: unconditionally allocate hs/ss descriptor in bind operation
usb: gadget: f_uvc: change endpoint allocation in uvc_function_bind()
usb: gadget: add a inline function gether_bitrate()
usb: gadget: use working speed to calcaulate network bitrate and qlen
dt-bindings: usb: samsung,exynos-dwc3: Add Exynos850 support
usb: dwc3: exynos: Add support for Exynos850 variant
usb: gadget: udc-xilinx: fix incorrect type in assignment warning
usb: gadget: udc-xilinx: fix cast from restricted __le16 warning
usb: gadget: udc-xilinx: fix restricted __le16 degrades to integer warning
USB: dwc2: hande irq on dead controller correctly
...
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Introduce support for nonstandard noncoherent systems in the RISC-V
architecture. It enables function pointer support to handle cache
management in such systems.
This patch adds a new configuration option called
"RISCV_NONSTANDARD_CACHE_OPS." This option is a boolean flag that
depends on "RISCV_DMA_NONCOHERENT" and enables the function pointer
support for cache management in nonstandard noncoherent systems.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Tested-by: Conor Dooley <conor.dooley@microchip.com> # tyre-kicking on a d1
Reviewed-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Tested-by: Emil Renner Berthing <emil.renner.berthing@canonical.com> #
Link: https://lore.kernel.org/r/20230818135723.80612-4-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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Add required ports of the Alternative scheme for Andes CPU cores.
I/O Coherence Port (IOCP) provides an AXI interface for connecting external
non-caching masters, such as DMA controllers. IOCP is a specification
option and is disabled on the Renesas RZ/Five SoC due to this reason cache
management needs a software workaround.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Tested-by: Conor Dooley <conor.dooley@microchip.com> # tyre-kicking on a d1
Link: https://lore.kernel.org/r/20230818135723.80612-3-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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