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author | Felix Fietkau <nbd@nbd.name> | 2020-10-24 21:14:16 +0200 |
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committer | Felix Fietkau <nbd@nbd.name> | 2021-02-16 20:06:51 +0100 |
commit | b10d6044599d8c1fa7fbb2374bcbf30118d39db1 (patch) | |
tree | 3fc84f92c14dfa7178487b71e1b8d63c2b688439 /target/linux/generic/pending-5.10/330-MIPS-kexec-Accept-command-line-parameters-from-users.patch | |
parent | 299b8554183791b325e393c880d32360d7d72f73 (diff) | |
download | upstream-b10d6044599d8c1fa7fbb2374bcbf30118d39db1.tar.gz upstream-b10d6044599d8c1fa7fbb2374bcbf30118d39db1.tar.bz2 upstream-b10d6044599d8c1fa7fbb2374bcbf30118d39db1.zip |
kernel: add linux 5.10 support
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Diffstat (limited to 'target/linux/generic/pending-5.10/330-MIPS-kexec-Accept-command-line-parameters-from-users.patch')
-rw-r--r-- | target/linux/generic/pending-5.10/330-MIPS-kexec-Accept-command-line-parameters-from-users.patch | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/target/linux/generic/pending-5.10/330-MIPS-kexec-Accept-command-line-parameters-from-users.patch b/target/linux/generic/pending-5.10/330-MIPS-kexec-Accept-command-line-parameters-from-users.patch new file mode 100644 index 0000000000..5a0e44b76b --- /dev/null +++ b/target/linux/generic/pending-5.10/330-MIPS-kexec-Accept-command-line-parameters-from-users.patch @@ -0,0 +1,281 @@ +From: Yousong Zhou <yszhou4tech@gmail.com> +Subject: MIPS: kexec: Accept command line parameters from userspace. + +Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com> +--- + arch/mips/kernel/machine_kexec.c | 153 +++++++++++++++++++++++++++++++----- + arch/mips/kernel/machine_kexec.h | 20 +++++ + arch/mips/kernel/relocate_kernel.S | 21 +++-- + 3 files changed, 167 insertions(+), 27 deletions(-) + create mode 100644 arch/mips/kernel/machine_kexec.h + +--- a/arch/mips/kernel/machine_kexec.c ++++ b/arch/mips/kernel/machine_kexec.c +@@ -9,14 +9,11 @@ + #include <linux/delay.h> + #include <linux/libfdt.h> + ++#include <asm/bootinfo.h> + #include <asm/cacheflush.h> + #include <asm/page.h> +- +-extern const unsigned char relocate_new_kernel[]; +-extern const size_t relocate_new_kernel_size; +- +-extern unsigned long kexec_start_address; +-extern unsigned long kexec_indirection_page; ++#include <linux/uaccess.h> ++#include "machine_kexec.h" + + static unsigned long reboot_code_buffer; + +@@ -30,6 +27,101 @@ void (*_crash_smp_send_stop)(void) = NUL + void (*_machine_kexec_shutdown)(void) = NULL; + void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL; + ++static void machine_kexec_print_args(void) ++{ ++ unsigned long argc = (int)kexec_args[0]; ++ int i; ++ ++ pr_info("kexec_args[0] (argc): %lu\n", argc); ++ pr_info("kexec_args[1] (argv): %p\n", (void *)kexec_args[1]); ++ pr_info("kexec_args[2] (env ): %p\n", (void *)kexec_args[2]); ++ pr_info("kexec_args[3] (desc): %p\n", (void *)kexec_args[3]); ++ ++ for (i = 0; i < argc; i++) { ++ pr_info("kexec_argv[%d] = %p, %s\n", ++ i, kexec_argv[i], kexec_argv[i]); ++ } ++} ++ ++static void machine_kexec_init_argv(struct kimage *image) ++{ ++ void __user *buf = NULL; ++ size_t bufsz; ++ size_t size; ++ int i; ++ ++ bufsz = 0; ++ for (i = 0; i < image->nr_segments; i++) { ++ struct kexec_segment *seg; ++ ++ seg = &image->segment[i]; ++ if (seg->bufsz < 6) ++ continue; ++ ++ if (strncmp((char *) seg->buf, "kexec ", 6)) ++ continue; ++ ++ buf = seg->buf; ++ bufsz = seg->bufsz; ++ break; ++ } ++ ++ if (!buf) ++ return; ++ ++ size = KEXEC_COMMAND_LINE_SIZE; ++ size = min(size, bufsz); ++ if (size < bufsz) ++ pr_warn("kexec command line truncated to %zd bytes\n", size); ++ ++ /* Copy to kernel space */ ++ if (copy_from_user(kexec_argv_buf, buf, size)) ++ pr_warn("kexec command line copy to kernel space failed\n"); ++ ++ kexec_argv_buf[size - 1] = 0; ++} ++ ++static void machine_kexec_parse_argv(struct kimage *image) ++{ ++ char *reboot_code_buffer; ++ int reloc_delta; ++ char *ptr; ++ int argc; ++ int i; ++ ++ ptr = kexec_argv_buf; ++ argc = 0; ++ ++ /* ++ * convert command line string to array of parameters ++ * (as bootloader does). ++ */ ++ while (ptr && *ptr && (KEXEC_MAX_ARGC > argc)) { ++ if (*ptr == ' ') { ++ *ptr++ = '\0'; ++ continue; ++ } ++ ++ kexec_argv[argc++] = ptr; ++ ptr = strchr(ptr, ' '); ++ } ++ ++ if (!argc) ++ return; ++ ++ kexec_args[0] = argc; ++ kexec_args[1] = (unsigned long)kexec_argv; ++ kexec_args[2] = 0; ++ kexec_args[3] = 0; ++ ++ reboot_code_buffer = page_address(image->control_code_page); ++ reloc_delta = reboot_code_buffer - (char *)kexec_relocate_new_kernel; ++ ++ kexec_args[1] += reloc_delta; ++ for (i = 0; i < argc; i++) ++ kexec_argv[i] += reloc_delta; ++} ++ + static void kexec_image_info(const struct kimage *kimage) + { + unsigned long i; +@@ -99,6 +191,18 @@ machine_kexec_prepare(struct kimage *kim + #endif + + kexec_image_info(kimage); ++ /* ++ * Whenever arguments passed from kexec-tools, Init the arguments as ++ * the original ones to try avoiding booting failure. ++ */ ++ ++ kexec_args[0] = fw_arg0; ++ kexec_args[1] = fw_arg1; ++ kexec_args[2] = fw_arg2; ++ kexec_args[3] = fw_arg3; ++ ++ machine_kexec_init_argv(kimage); ++ machine_kexec_parse_argv(kimage); + + if (_machine_kexec_prepare) + return _machine_kexec_prepare(kimage); +@@ -161,7 +265,7 @@ machine_crash_shutdown(struct pt_regs *r + void kexec_nonboot_cpu_jump(void) + { + local_flush_icache_range((unsigned long)relocated_kexec_smp_wait, +- reboot_code_buffer + relocate_new_kernel_size); ++ reboot_code_buffer + KEXEC_RELOCATE_NEW_KERNEL_SIZE); + + relocated_kexec_smp_wait(NULL); + } +@@ -199,7 +303,7 @@ void kexec_reboot(void) + * machine_kexec() CPU. + */ + local_flush_icache_range(reboot_code_buffer, +- reboot_code_buffer + relocate_new_kernel_size); ++ reboot_code_buffer + KEXEC_RELOCATE_NEW_KERNEL_SIZE); + + do_kexec = (void *)reboot_code_buffer; + do_kexec(); +@@ -212,10 +316,12 @@ machine_kexec(struct kimage *image) + unsigned long *ptr; + + reboot_code_buffer = +- (unsigned long)page_address(image->control_code_page); ++ (unsigned long)page_address(image->control_code_page); ++ pr_info("reboot_code_buffer = %p\n", (void *)reboot_code_buffer); + + kexec_start_address = + (unsigned long) phys_to_virt(image->start); ++ pr_info("kexec_start_address = %p\n", (void *)kexec_start_address); + + if (image->type == KEXEC_TYPE_DEFAULT) { + kexec_indirection_page = +@@ -223,9 +329,19 @@ machine_kexec(struct kimage *image) + } else { + kexec_indirection_page = (unsigned long)&image->head; + } ++ pr_info("kexec_indirection_page = %p\n", (void *)kexec_indirection_page); + +- memcpy((void*)reboot_code_buffer, relocate_new_kernel, +- relocate_new_kernel_size); ++ pr_info("Where is memcpy: %p\n", memcpy); ++ pr_info("kexec_relocate_new_kernel = %p, kexec_relocate_new_kernel_end = %p\n", ++ (void *)kexec_relocate_new_kernel, &kexec_relocate_new_kernel_end); ++ pr_info("Copy %lu bytes from %p to %p\n", KEXEC_RELOCATE_NEW_KERNEL_SIZE, ++ (void *)kexec_relocate_new_kernel, (void *)reboot_code_buffer); ++ memcpy((void*)reboot_code_buffer, kexec_relocate_new_kernel, ++ KEXEC_RELOCATE_NEW_KERNEL_SIZE); ++ ++ pr_info("Before _print_args().\n"); ++ machine_kexec_print_args(); ++ pr_info("Before eval loop.\n"); + + /* + * The generic kexec code builds a page list with physical +@@ -256,7 +372,7 @@ machine_kexec(struct kimage *image) + #ifdef CONFIG_SMP + /* All secondary cpus now may jump to kexec_wait cycle */ + relocated_kexec_smp_wait = reboot_code_buffer + +- (void *)(kexec_smp_wait - relocate_new_kernel); ++ (void *)(kexec_smp_wait - kexec_relocate_new_kernel); + smp_wmb(); + atomic_set(&kexec_ready_to_reboot, 1); + #endif +--- /dev/null ++++ b/arch/mips/kernel/machine_kexec.h +@@ -0,0 +1,20 @@ ++#ifndef _MACHINE_KEXEC_H ++#define _MACHINE_KEXEC_H ++ ++#ifndef __ASSEMBLY__ ++extern const unsigned char kexec_relocate_new_kernel[]; ++extern unsigned long kexec_relocate_new_kernel_end; ++extern unsigned long kexec_start_address; ++extern unsigned long kexec_indirection_page; ++ ++extern char kexec_argv_buf[]; ++extern char *kexec_argv[]; ++ ++#define KEXEC_RELOCATE_NEW_KERNEL_SIZE ((unsigned long)&kexec_relocate_new_kernel_end - (unsigned long)kexec_relocate_new_kernel) ++#endif /* !__ASSEMBLY__ */ ++ ++#define KEXEC_COMMAND_LINE_SIZE 256 ++#define KEXEC_ARGV_SIZE (KEXEC_COMMAND_LINE_SIZE / 16) ++#define KEXEC_MAX_ARGC (KEXEC_ARGV_SIZE / sizeof(long)) ++ ++#endif +--- a/arch/mips/kernel/relocate_kernel.S ++++ b/arch/mips/kernel/relocate_kernel.S +@@ -10,8 +10,9 @@ + #include <asm/mipsregs.h> + #include <asm/stackframe.h> + #include <asm/addrspace.h> ++#include "machine_kexec.h" + +-LEAF(relocate_new_kernel) ++LEAF(kexec_relocate_new_kernel) + PTR_L a0, arg0 + PTR_L a1, arg1 + PTR_L a2, arg2 +@@ -96,7 +97,7 @@ done: + #endif + /* jump to kexec_start_address */ + j s1 +- END(relocate_new_kernel) ++ END(kexec_relocate_new_kernel) + + #ifdef CONFIG_SMP + /* +@@ -182,9 +183,15 @@ kexec_indirection_page: + PTR 0 + .size kexec_indirection_page, PTRSIZE + +-relocate_new_kernel_end: ++kexec_argv_buf: ++ EXPORT(kexec_argv_buf) ++ .skip KEXEC_COMMAND_LINE_SIZE ++ .size kexec_argv_buf, KEXEC_COMMAND_LINE_SIZE + +-relocate_new_kernel_size: +- EXPORT(relocate_new_kernel_size) +- PTR relocate_new_kernel_end - relocate_new_kernel +- .size relocate_new_kernel_size, PTRSIZE ++kexec_argv: ++ EXPORT(kexec_argv) ++ .skip KEXEC_ARGV_SIZE ++ .size kexec_argv, KEXEC_ARGV_SIZE ++ ++kexec_relocate_new_kernel_end: ++ EXPORT(kexec_relocate_new_kernel_end) |