6.1-stable review patch. If anyone has any objections, please let me know.
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From: Sourabh Jain sourabhjain@linux.ibm.com
[ Upstream commit 0857beff9c1ec8bb421a8b7a721da0f34cc886c0 ]
Move the update_cpus_node() from kexec/{file_load_64.c => core_64.c} to allow other kexec components to use it.
Later in the series, this function is used for in-kernel updates to the kdump image during CPU/memory hotplug or online/offline events for both kexec_load and kexec_file_load syscalls.
No functional changes are intended.
Signed-off-by: Sourabh Jain sourabhjain@linux.ibm.com Acked-by: Hari Bathini hbathini@linux.ibm.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://msgid.link/20240326055413.186534-5-sourabhjain@linux.ibm.com Stable-dep-of: 932bed412170 ("powerpc/kexec_file: fix cpus node update to FDT") Signed-off-by: Sasha Levin sashal@kernel.org --- arch/powerpc/include/asm/kexec.h | 4 ++ arch/powerpc/kexec/core_64.c | 91 +++++++++++++++++++++++++++++++ arch/powerpc/kexec/file_load_64.c | 87 ----------------------------- 3 files changed, 95 insertions(+), 87 deletions(-)
diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h index a1ddba01e7d13..f2db1b443920e 100644 --- a/arch/powerpc/include/asm/kexec.h +++ b/arch/powerpc/include/asm/kexec.h @@ -181,6 +181,10 @@ static inline void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
#endif /* CONFIG_KEXEC_CORE */
+#if defined(CONFIG_KEXEC_FILE) || defined(CONFIG_CRASH_DUMP) +int update_cpus_node(void *fdt); +#endif + #ifdef CONFIG_PPC_BOOK3S_64 #include <asm/book3s/64/kexec.h> #endif diff --git a/arch/powerpc/kexec/core_64.c b/arch/powerpc/kexec/core_64.c index e465e44877376..8a33de499316e 100644 --- a/arch/powerpc/kexec/core_64.c +++ b/arch/powerpc/kexec/core_64.c @@ -17,6 +17,7 @@ #include <linux/cpu.h> #include <linux/hardirq.h> #include <linux/of.h> +#include <linux/libfdt.h>
#include <asm/page.h> #include <asm/current.h> @@ -31,6 +32,7 @@ #include <asm/hw_breakpoint.h> #include <asm/svm.h> #include <asm/ultravisor.h> +#include <asm/crashdump-ppc64.h>
int machine_kexec_prepare(struct kimage *image) { @@ -431,3 +433,92 @@ static int __init export_htab_values(void) } late_initcall(export_htab_values); #endif /* CONFIG_PPC_64S_HASH_MMU */ + +#if defined(CONFIG_KEXEC_FILE) || defined(CONFIG_CRASH_DUMP) +/** + * add_node_props - Reads node properties from device node structure and add + * them to fdt. + * @fdt: Flattened device tree of the kernel + * @node_offset: offset of the node to add a property at + * @dn: device node pointer + * + * Returns 0 on success, negative errno on error. + */ +static int add_node_props(void *fdt, int node_offset, const struct device_node *dn) +{ + int ret = 0; + struct property *pp; + + if (!dn) + return -EINVAL; + + for_each_property_of_node(dn, pp) { + ret = fdt_setprop(fdt, node_offset, pp->name, pp->value, pp->length); + if (ret < 0) { + pr_err("Unable to add %s property: %s\n", pp->name, fdt_strerror(ret)); + return ret; + } + } + return ret; +} + +/** + * update_cpus_node - Update cpus node of flattened device tree using of_root + * device node. + * @fdt: Flattened device tree of the kernel. + * + * Returns 0 on success, negative errno on error. + */ +int update_cpus_node(void *fdt) +{ + struct device_node *cpus_node, *dn; + int cpus_offset, cpus_subnode_offset, ret = 0; + + cpus_offset = fdt_path_offset(fdt, "/cpus"); + if (cpus_offset < 0 && cpus_offset != -FDT_ERR_NOTFOUND) { + pr_err("Malformed device tree: error reading /cpus node: %s\n", + fdt_strerror(cpus_offset)); + return cpus_offset; + } + + if (cpus_offset > 0) { + ret = fdt_del_node(fdt, cpus_offset); + if (ret < 0) { + pr_err("Error deleting /cpus node: %s\n", fdt_strerror(ret)); + return -EINVAL; + } + } + + /* Add cpus node to fdt */ + cpus_offset = fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"), "cpus"); + if (cpus_offset < 0) { + pr_err("Error creating /cpus node: %s\n", fdt_strerror(cpus_offset)); + return -EINVAL; + } + + /* Add cpus node properties */ + cpus_node = of_find_node_by_path("/cpus"); + ret = add_node_props(fdt, cpus_offset, cpus_node); + of_node_put(cpus_node); + if (ret < 0) + return ret; + + /* Loop through all subnodes of cpus and add them to fdt */ + for_each_node_by_type(dn, "cpu") { + cpus_subnode_offset = fdt_add_subnode(fdt, cpus_offset, dn->full_name); + if (cpus_subnode_offset < 0) { + pr_err("Unable to add %s subnode: %s\n", dn->full_name, + fdt_strerror(cpus_subnode_offset)); + ret = cpus_subnode_offset; + goto out; + } + + ret = add_node_props(fdt, cpus_subnode_offset, dn); + if (ret < 0) + goto out; + } +out: + of_node_put(dn); + return ret; +} +#endif /* CONFIG_KEXEC_FILE || CONFIG_CRASH_DUMP */ diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c index 349a781cea0b3..180c1dfe4aa77 100644 --- a/arch/powerpc/kexec/file_load_64.c +++ b/arch/powerpc/kexec/file_load_64.c @@ -952,93 +952,6 @@ unsigned int kexec_extra_fdt_size_ppc64(struct kimage *image) return (unsigned int)(usm_entries * sizeof(u64)); }
-/** - * add_node_props - Reads node properties from device node structure and add - * them to fdt. - * @fdt: Flattened device tree of the kernel - * @node_offset: offset of the node to add a property at - * @dn: device node pointer - * - * Returns 0 on success, negative errno on error. - */ -static int add_node_props(void *fdt, int node_offset, const struct device_node *dn) -{ - int ret = 0; - struct property *pp; - - if (!dn) - return -EINVAL; - - for_each_property_of_node(dn, pp) { - ret = fdt_setprop(fdt, node_offset, pp->name, pp->value, pp->length); - if (ret < 0) { - pr_err("Unable to add %s property: %s\n", pp->name, fdt_strerror(ret)); - return ret; - } - } - return ret; -} - -/** - * update_cpus_node - Update cpus node of flattened device tree using of_root - * device node. - * @fdt: Flattened device tree of the kernel. - * - * Returns 0 on success, negative errno on error. - */ -static int update_cpus_node(void *fdt) -{ - struct device_node *cpus_node, *dn; - int cpus_offset, cpus_subnode_offset, ret = 0; - - cpus_offset = fdt_path_offset(fdt, "/cpus"); - if (cpus_offset < 0 && cpus_offset != -FDT_ERR_NOTFOUND) { - pr_err("Malformed device tree: error reading /cpus node: %s\n", - fdt_strerror(cpus_offset)); - return cpus_offset; - } - - if (cpus_offset > 0) { - ret = fdt_del_node(fdt, cpus_offset); - if (ret < 0) { - pr_err("Error deleting /cpus node: %s\n", fdt_strerror(ret)); - return -EINVAL; - } - } - - /* Add cpus node to fdt */ - cpus_offset = fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"), "cpus"); - if (cpus_offset < 0) { - pr_err("Error creating /cpus node: %s\n", fdt_strerror(cpus_offset)); - return -EINVAL; - } - - /* Add cpus node properties */ - cpus_node = of_find_node_by_path("/cpus"); - ret = add_node_props(fdt, cpus_offset, cpus_node); - of_node_put(cpus_node); - if (ret < 0) - return ret; - - /* Loop through all subnodes of cpus and add them to fdt */ - for_each_node_by_type(dn, "cpu") { - cpus_subnode_offset = fdt_add_subnode(fdt, cpus_offset, dn->full_name); - if (cpus_subnode_offset < 0) { - pr_err("Unable to add %s subnode: %s\n", dn->full_name, - fdt_strerror(cpus_subnode_offset)); - ret = cpus_subnode_offset; - goto out; - } - - ret = add_node_props(fdt, cpus_subnode_offset, dn); - if (ret < 0) - goto out; - } -out: - of_node_put(dn); - return ret; -} - static int copy_property(void *fdt, int node_offset, const struct device_node *dn, const char *propname) {