Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 230 insertions, 0 deletions

diff --git a/arch/nds32/kernel/vdso.c b/arch/nds32/kernel/vdso.c
new file mode 100644
index 000000000..016f15891
--- /dev/null
+++ b/arch/nds32/kernel/vdso.c
@@ -0,0 +1,230 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2012 ARM Limited
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/cache.h>
+#include <linux/clocksource.h>
+#include <linux/elf.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/gfp.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/slab.h>
+#include <linux/timekeeper_internal.h>
+#include <linux/vmalloc.h>
+#include <linux/random.h>
+
+#include <asm/cacheflush.h>
+#include <asm/vdso.h>
+#include <asm/vdso_datapage.h>
+#include <asm/vdso_timer_info.h>
+#include <asm/cache_info.h>
+extern struct cache_info L1_cache_info[2];
+extern char vdso_start[], vdso_end[];
+static unsigned long vdso_pages __ro_after_init;
+static unsigned long timer_mapping_base;
+
+struct timer_info_t timer_info = {
+	.cycle_count_down = true,
+	.mapping_base = EMPTY_TIMER_MAPPING,
+	.cycle_count_reg_offset = EMPTY_REG_OFFSET
+};
+/*
+ * The vDSO data page.
+ */
+static struct page *no_pages[] = { NULL };
+
+static union {
+	struct vdso_data data;
+	u8 page[PAGE_SIZE];
+} vdso_data_store __page_aligned_data;
+struct vdso_data *vdso_data = &vdso_data_store.data;
+static struct vm_special_mapping vdso_spec[2] __ro_after_init = {
+	{
+	 .name = "[vvar]",
+	 .pages = no_pages,
+	 },
+	{
+	 .name = "[vdso]",
+	 },
+};
+
+static void get_timer_node_info(void)
+{
+	timer_mapping_base = timer_info.mapping_base;
+	vdso_data->cycle_count_offset =
+		timer_info.cycle_count_reg_offset;
+	vdso_data->cycle_count_down =
+		timer_info.cycle_count_down;
+}
+
+static int __init vdso_init(void)
+{
+	int i;
+	struct page **vdso_pagelist;
+
+	if (memcmp(vdso_start, "\177ELF", 4)) {
+		pr_err("vDSO is not a valid ELF object!\n");
+		return -EINVAL;
+	}
+	/* Creat a timer io mapping to get clock cycles counter */
+	get_timer_node_info();
+
+	vdso_pages = (vdso_end - vdso_start) >> PAGE_SHIFT;
+	pr_info("vdso: %ld pages (%ld code @ %p, %ld data @ %p)\n",
+		vdso_pages + 1, vdso_pages, vdso_start, 1L, vdso_data);
+
+	/* Allocate the vDSO pagelist */
+	vdso_pagelist = kcalloc(vdso_pages, sizeof(struct page *), GFP_KERNEL);
+	if (vdso_pagelist == NULL)
+		return -ENOMEM;
+
+	for (i = 0; i < vdso_pages; i++)
+		vdso_pagelist[i] = virt_to_page(vdso_start + i * PAGE_SIZE);
+	vdso_spec[1].pages = &vdso_pagelist[0];
+
+	return 0;
+}
+
+arch_initcall(vdso_init);
+
+unsigned long inline vdso_random_addr(unsigned long vdso_mapping_len)
+{
+	unsigned long start = current->mm->mmap_base, end, offset, addr;
+	start = PAGE_ALIGN(start);
+
+	/* Round the lowest possible end address up to a PMD boundary. */
+	end = (start + vdso_mapping_len + PMD_SIZE - 1) & PMD_MASK;
+	if (end >= TASK_SIZE)
+		end = TASK_SIZE;
+	end -= vdso_mapping_len;
+
+	if (end > start) {
+		offset = get_random_int() % (((end - start) >> PAGE_SHIFT) + 1);
+		addr = start + (offset << PAGE_SHIFT);
+	} else {
+		addr = start;
+	}
+	return addr;
+}
+
+int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
+{
+	struct mm_struct *mm = current->mm;
+	unsigned long vdso_base, vdso_text_len, vdso_mapping_len;
+	struct vm_area_struct *vma;
+	unsigned long addr = 0;
+	pgprot_t prot;
+	int ret, vvar_page_num = 2;
+
+	vdso_text_len = vdso_pages << PAGE_SHIFT;
+
+	if(timer_mapping_base == EMPTY_VALUE)
+		vvar_page_num = 1;
+	/* Be sure to map the data page */
+	vdso_mapping_len = vdso_text_len + vvar_page_num * PAGE_SIZE;
+#ifdef CONFIG_CPU_CACHE_ALIASING
+	vdso_mapping_len += L1_cache_info[DCACHE].aliasing_num - 1;
+#endif
+
+	if (down_write_killable(&mm->mmap_sem))
+		return -EINTR;
+
+	addr = vdso_random_addr(vdso_mapping_len);
+	vdso_base = get_unmapped_area(NULL, addr, vdso_mapping_len, 0, 0);
+	if (IS_ERR_VALUE(vdso_base)) {
+		ret = vdso_base;
+		goto up_fail;
+	}
+
+#ifdef CONFIG_CPU_CACHE_ALIASING
+	{
+		unsigned int aliasing_mask =
+		    L1_cache_info[DCACHE].aliasing_mask;
+		unsigned int page_colour_ofs;
+		page_colour_ofs = ((unsigned int)vdso_data & aliasing_mask) -
+		    (vdso_base & aliasing_mask);
+		vdso_base += page_colour_ofs & aliasing_mask;
+	}
+#endif
+
+	vma = _install_special_mapping(mm, vdso_base, vvar_page_num * PAGE_SIZE,
+				       VM_READ | VM_MAYREAD, &vdso_spec[0]);
+	if (IS_ERR(vma)) {
+		ret = PTR_ERR(vma);
+		goto up_fail;
+	}
+
+	/*Map vdata to user space */
+	ret = io_remap_pfn_range(vma, vdso_base,
+				 virt_to_phys(vdso_data) >> PAGE_SHIFT,
+				 PAGE_SIZE, vma->vm_page_prot);
+	if (ret)
+		goto up_fail;
+
+	/*Map timer to user space */
+	vdso_base += PAGE_SIZE;
+	prot = __pgprot(_PAGE_V | _PAGE_M_UR_KR | _PAGE_D |  _PAGE_C_DEV);
+	ret = io_remap_pfn_range(vma, vdso_base, timer_mapping_base >> PAGE_SHIFT,
+				 PAGE_SIZE, prot);
+	if (ret)
+		goto up_fail;
+
+	/*Map vdso to user space */
+	vdso_base += PAGE_SIZE;
+	mm->context.vdso = (void *)vdso_base;
+	vma = _install_special_mapping(mm, vdso_base, vdso_text_len,
+				       VM_READ | VM_EXEC |
+				       VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC,
+				       &vdso_spec[1]);
+	if (IS_ERR(vma)) {
+		ret = PTR_ERR(vma);
+		goto up_fail;
+	}
+
+	up_write(&mm->mmap_sem);
+	return 0;
+
+up_fail:
+	mm->context.vdso = NULL;
+	up_write(&mm->mmap_sem);
+	return ret;
+}
+
+static void vdso_write_begin(struct vdso_data *vdata)
+{
+	++vdso_data->seq_count;
+	smp_wmb();		/* Pairs with smp_rmb in vdso_read_retry */
+}
+
+static void vdso_write_end(struct vdso_data *vdata)
+{
+	smp_wmb();		/* Pairs with smp_rmb in vdso_read_begin */
+	++vdso_data->seq_count;
+}
+
+void update_vsyscall(struct timekeeper *tk)
+{
+	vdso_write_begin(vdso_data);
+	vdso_data->cs_mask = tk->tkr_mono.mask;
+	vdso_data->cs_mult = tk->tkr_mono.mult;
+	vdso_data->cs_shift = tk->tkr_mono.shift;
+	vdso_data->cs_cycle_last = tk->tkr_mono.cycle_last;
+	vdso_data->wtm_clock_sec = tk->wall_to_monotonic.tv_sec;
+	vdso_data->wtm_clock_nsec = tk->wall_to_monotonic.tv_nsec;
+	vdso_data->xtime_clock_sec = tk->xtime_sec;
+	vdso_data->xtime_clock_nsec = tk->tkr_mono.xtime_nsec;
+	vdso_data->xtime_coarse_sec = tk->xtime_sec;
+	vdso_data->xtime_coarse_nsec = tk->tkr_mono.xtime_nsec >>
+	    tk->tkr_mono.shift;
+	vdso_write_end(vdso_data);
+}
+
+void update_vsyscall_tz(void)
+{
+	vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
+	vdso_data->tz_dsttime = sys_tz.tz_dsttime;
+}