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aa5e65dc08
We can see that "Time namespaces are not supported" on LoongArch: (1) clone3 test # cd tools/testing/selftests/clone3 && make && ./clone3 ... # Time namespaces are not supported ok 18 # SKIP Skipping clone3() with CLONE_NEWTIME # Totals: pass:17 fail:0 xfail:0 xpass:0 skip:1 error:0 (2) timens test # cd tools/testing/selftests/timens && make && ./timens ... 1..0 # SKIP Time namespaces are not supported On LoongArch the current kernel does not support CONFIG_TIME_NS which depends on GENERIC_VDSO_TIME_NS, select GENERIC_VDSO_TIME_NS to enable CONFIG_TIME_NS to build kernel/time/namespace.c. Additionally, it needs to define some arch-dependent functions for the timens, such as __arch_get_timens_vdso_data(), arch_get_vdso_data() and vdso_join_timens(). At the same time, modify the layout of vvar to use one page size for generic vdso data, expand another page size for timens vdso data and assign LOONGARCH_VDSO_DATA_SIZE (maybe exceeds a page size if expand in the future) for loongarch vdso data, at last add the callback function vvar_fault() and modify stack_top(). With this patch under CONFIG_TIME_NS: (1) clone3 test # cd tools/testing/selftests/clone3 && make && ./clone3 ... ok 18 [739] Result (0) matches expectation (0) # Totals: pass:18 fail:0 xfail:0 xpass:0 skip:0 error:0 (2) timens test # cd tools/testing/selftests/timens && make && ./timens ... # Totals: pass:10 fail:0 xfail:0 xpass:0 skip:0 error:0 Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Author: Huacai Chen <chenhuacai@loongson.cn>
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef __ASSEMBLY__
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#include <asm/asm.h>
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#include <asm/page.h>
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#include <asm/vdso.h>
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struct vdso_pcpu_data {
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u32 node;
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} ____cacheline_aligned_in_smp;
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struct loongarch_vdso_data {
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struct vdso_pcpu_data pdata[NR_CPUS];
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};
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/*
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* The layout of vvar:
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*
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* high
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* +---------------------+--------------------------+
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* | loongarch vdso data | LOONGARCH_VDSO_DATA_SIZE |
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* +---------------------+--------------------------+
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* | time-ns vdso data | PAGE_SIZE |
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* +---------------------+--------------------------+
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* | generic vdso data | PAGE_SIZE |
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* +---------------------+--------------------------+
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* low
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*/
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#define LOONGARCH_VDSO_DATA_SIZE PAGE_ALIGN(sizeof(struct loongarch_vdso_data))
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#define LOONGARCH_VDSO_DATA_PAGES (LOONGARCH_VDSO_DATA_SIZE >> PAGE_SHIFT)
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enum vvar_pages {
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VVAR_GENERIC_PAGE_OFFSET,
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VVAR_TIMENS_PAGE_OFFSET,
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VVAR_LOONGARCH_PAGES_START,
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VVAR_LOONGARCH_PAGES_END = VVAR_LOONGARCH_PAGES_START + LOONGARCH_VDSO_DATA_PAGES - 1,
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VVAR_NR_PAGES,
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};
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#define VVAR_SIZE (VVAR_NR_PAGES << PAGE_SHIFT)
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static inline unsigned long get_vdso_base(void)
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{
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unsigned long addr;
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__asm__(
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" la.pcrel %0, _start\n"
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: "=r" (addr)
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:
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:);
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return addr;
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}
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static inline unsigned long get_vdso_data(void)
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{
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return get_vdso_base() - VVAR_SIZE;
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}
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#endif /* __ASSEMBLY__ */
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