diff options
Diffstat (limited to 'target/linux/ipq806x/patches/0008-ARM-Introduce-CPU_METHOD_OF_DECLARE-for-cpu-hotplug-.patch')
| -rw-r--r-- | target/linux/ipq806x/patches/0008-ARM-Introduce-CPU_METHOD_OF_DECLARE-for-cpu-hotplug-.patch | 150 |
1 files changed, 0 insertions, 150 deletions
diff --git a/target/linux/ipq806x/patches/0008-ARM-Introduce-CPU_METHOD_OF_DECLARE-for-cpu-hotplug-.patch b/target/linux/ipq806x/patches/0008-ARM-Introduce-CPU_METHOD_OF_DECLARE-for-cpu-hotplug-.patch deleted file mode 100644 index b4a8b4b5ef..0000000000 --- a/target/linux/ipq806x/patches/0008-ARM-Introduce-CPU_METHOD_OF_DECLARE-for-cpu-hotplug-.patch +++ /dev/null @@ -1,150 +0,0 @@ -From 48f17325fef9cbebc5cb39aa78f4c1caff5d7b16 Mon Sep 17 00:00:00 2001 -From: Stephen Boyd <sboyd@codeaurora.org> -Date: Wed, 30 Oct 2013 18:21:09 -0700 -Subject: [PATCH 008/182] ARM: Introduce CPU_METHOD_OF_DECLARE() for cpu - hotplug/smp - -The goal of multi-platform kernels is to remove the need for mach -directories and machine descriptors. To further that goal, -introduce CPU_METHOD_OF_DECLARE() to allow cpu hotplug/smp -support to be separated from the machine descriptors. -Implementers should specify an enable-method property in their -cpus node and then implement a matching set of smp_ops in their -hotplug/smp code, wiring it up with the CPU_METHOD_OF_DECLARE() -macro. When the kernel is compiled we'll collect all the -enable-method smp_ops into one section for use at boot. - -At boot time we'll look for an enable-method in each cpu node and -try to match that against all known CPU enable methods in the -kernel. If there are no enable-methods in the cpu nodes we -fallback to the cpus node and try to use any enable-method found -there. If that doesn't work we fall back to the old way of using -the machine descriptor. - -Acked-by: Mark Rutland <mark.rutland@arm.com> -Cc: Russell King <linux@arm.linux.org.uk> -Cc: <devicetree@vger.kernel.org> -Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> -Signed-off-by: Kumar Gala <galak@codeaurora.org> ---- - arch/arm/include/asm/smp.h | 9 +++++++++ - arch/arm/kernel/devtree.c | 40 +++++++++++++++++++++++++++++++++++++ - include/asm-generic/vmlinux.lds.h | 10 ++++++++++ - 3 files changed, 59 insertions(+) - ---- a/arch/arm/include/asm/smp.h -+++ b/arch/arm/include/asm/smp.h -@@ -114,6 +114,15 @@ struct smp_operations { - #endif - }; - -+struct of_cpu_method { -+ const char *method; -+ struct smp_operations *ops; -+}; -+ -+#define CPU_METHOD_OF_DECLARE(name, _method, _ops) \ -+ static const struct of_cpu_method __cpu_method_of_table_##name \ -+ __used __section(__cpu_method_of_table) \ -+ = { .method = _method, .ops = _ops } - /* - * set platform specific SMP operations - */ ---- a/arch/arm/kernel/devtree.c -+++ b/arch/arm/kernel/devtree.c -@@ -18,6 +18,7 @@ - #include <linux/of_fdt.h> - #include <linux/of_irq.h> - #include <linux/of_platform.h> -+#include <linux/smp.h> - - #include <asm/cputype.h> - #include <asm/setup.h> -@@ -63,6 +64,34 @@ void __init arm_dt_memblock_reserve(void - } - } - -+#ifdef CONFIG_SMP -+extern struct of_cpu_method __cpu_method_of_table_begin[]; -+extern struct of_cpu_method __cpu_method_of_table_end[]; -+ -+static int __init set_smp_ops_by_method(struct device_node *node) -+{ -+ const char *method; -+ struct of_cpu_method *m = __cpu_method_of_table_begin; -+ -+ if (of_property_read_string(node, "enable-method", &method)) -+ return 0; -+ -+ for (; m < __cpu_method_of_table_end; m++) -+ if (!strcmp(m->method, method)) { -+ smp_set_ops(m->ops); -+ return 1; -+ } -+ -+ return 0; -+} -+#else -+static inline int set_smp_ops_by_method(struct device_node *node) -+{ -+ return 1; -+} -+#endif -+ -+ - /* - * arm_dt_init_cpu_maps - Function retrieves cpu nodes from the device tree - * and builds the cpu logical map array containing MPIDR values related to -@@ -79,6 +108,7 @@ void __init arm_dt_init_cpu_maps(void) - * read as 0. - */ - struct device_node *cpu, *cpus; -+ int found_method = 0; - u32 i, j, cpuidx = 1; - u32 mpidr = is_smp() ? read_cpuid_mpidr() & MPIDR_HWID_BITMASK : 0; - -@@ -150,8 +180,18 @@ void __init arm_dt_init_cpu_maps(void) - } - - tmp_map[i] = hwid; -+ -+ if (!found_method) -+ found_method = set_smp_ops_by_method(cpu); - } - -+ /* -+ * Fallback to an enable-method in the cpus node if nothing found in -+ * a cpu node. -+ */ -+ if (!found_method) -+ set_smp_ops_by_method(cpus); -+ - if (!bootcpu_valid) { - pr_warn("DT missing boot CPU MPIDR[23:0], fall back to default cpu_logical_map\n"); - return; ---- a/include/asm-generic/vmlinux.lds.h -+++ b/include/asm-generic/vmlinux.lds.h -@@ -177,6 +177,15 @@ - #define CLK_OF_TABLES() - #endif - -+#ifdef CONFIG_SMP -+#define CPU_METHOD_OF_TABLES() . = ALIGN(8); \ -+ VMLINUX_SYMBOL(__cpu_method_of_table_begin) = .; \ -+ *(__cpu_method_of_table) \ -+ VMLINUX_SYMBOL(__cpu_method_of_table_end) = .; -+#else -+#define CPU_METHOD_OF_TABLES() -+#endif -+ - #define KERNEL_DTB() \ - STRUCT_ALIGN(); \ - VMLINUX_SYMBOL(__dtb_start) = .; \ -@@ -502,6 +511,7 @@ - MEM_DISCARD(init.rodata) \ - CLK_OF_TABLES() \ - CLKSRC_OF_TABLES() \ -+ CPU_METHOD_OF_TABLES() \ - KERNEL_DTB() \ - IRQCHIP_OF_MATCH_TABLE() - |