Merge tag 'riscv-for-linus-6.19-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

Pull RISC-V updates from Paul Walmsley:

 - Enable parallel hotplug for RISC-V

 - Optimize vector regset allocation for ptrace()

 - Add a kernel selftest for the vector ptrace interface

 - Enable the userspace RAID6 test to build and run using RISC-V vectors

 - Add initial support for the Zalasr RISC-V ratified ISA extension

 - For the Zicbop RISC-V ratified ISA extension to userspace, expose
   hardware and kernel support to userspace and add a kselftest for
   Zicbop

 - Convert open-coded instances of 'asm goto's that are controlled by
   runtime ALTERNATIVEs to use riscv_has_extension_{un,}likely(),
   following arm64's alternative_has_cap_{un,}likely()

 - Remove an unnecessary mask in the GFP flags used in some calls to
   pagetable_alloc()

* tag 'riscv-for-linus-6.19-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  selftests/riscv: Add Zicbop prefetch test
  riscv: hwprobe: Expose Zicbop extension and its block size
  riscv: Introduce Zalasr instructions
  riscv: hwprobe: Export Zalasr extension
  dt-bindings: riscv: Add Zalasr ISA extension description
  riscv: Add ISA extension parsing for Zalasr
  selftests: riscv: Add test for the Vector ptrace interface
  riscv: ptrace: Optimize the allocation of vector regset
  raid6: test: Add support for RISC-V
  raid6: riscv: Allow code to be compiled in userspace
  raid6: riscv: Prevent compiler from breaking inline vector assembly code
  riscv: cmpxchg: Use riscv_has_extension_likely
  riscv: bitops: Use riscv_has_extension_likely
  riscv: hweight: Use riscv_has_extension_likely
  riscv: checksum: Use riscv_has_extension_likely
  riscv: pgtable: Use riscv_has_extension_unlikely
  riscv: Remove __GFP_HIGHMEM masking
  RISC-V: Enable HOTPLUG_PARALLEL for secondary CPUs

5 files changed, 46 insertions, 3 deletions

diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index 5441282656a7..b057362f8fb5 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -472,6 +472,7 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
 	__RISCV_ISA_EXT_DATA(zaamo, RISCV_ISA_EXT_ZAAMO),
 	__RISCV_ISA_EXT_DATA(zabha, RISCV_ISA_EXT_ZABHA),
 	__RISCV_ISA_EXT_DATA(zacas, RISCV_ISA_EXT_ZACAS),
+	__RISCV_ISA_EXT_DATA(zalasr, RISCV_ISA_EXT_ZALASR),
 	__RISCV_ISA_EXT_DATA(zalrsc, RISCV_ISA_EXT_ZALRSC),
 	__RISCV_ISA_EXT_DATA(zawrs, RISCV_ISA_EXT_ZAWRS),
 	__RISCV_ISA_EXT_DATA_VALIDATE(zfa, RISCV_ISA_EXT_ZFA, riscv_ext_f_depends),
diff --git a/arch/riscv/kernel/ptrace.c b/arch/riscv/kernel/ptrace.c
index 8e86305831ea..e6272d74572f 100644
--- a/arch/riscv/kernel/ptrace.c
+++ b/arch/riscv/kernel/ptrace.c
@@ -153,6 +153,17 @@ static int riscv_vr_set(struct task_struct *target,
 				 0, riscv_v_vsize);
 	return ret;
 }
+
+static int riscv_vr_active(struct task_struct *target, const struct user_regset *regset)
+{
+	if (!(has_vector() || has_xtheadvector()))
+		return -ENODEV;
+
+	if (!riscv_v_vstate_query(task_pt_regs(target)))
+		return 0;
+
+	return regset->n;
+}
 #endif
 
 #ifdef CONFIG_RISCV_ISA_SUPM
@@ -184,7 +195,7 @@ static int tagged_addr_ctrl_set(struct task_struct *target,
 }
 #endif
 
-static const struct user_regset riscv_user_regset[] = {
+static struct user_regset riscv_user_regset[] __ro_after_init = {
 	[REGSET_X] = {
 		USER_REGSET_NOTE_TYPE(PRSTATUS),
 		.n = ELF_NGREG,
@@ -207,11 +218,10 @@ static const struct user_regset riscv_user_regset[] = {
 	[REGSET_V] = {
 		USER_REGSET_NOTE_TYPE(RISCV_VECTOR),
 		.align = 16,
-		.n = ((32 * RISCV_MAX_VLENB) +
-		      sizeof(struct __riscv_v_regset_state)) / sizeof(__u32),
 		.size = sizeof(__u32),
 		.regset_get = riscv_vr_get,
 		.set = riscv_vr_set,
+		.active = riscv_vr_active,
 	},
 #endif
 #ifdef CONFIG_RISCV_ISA_SUPM
@@ -233,6 +243,14 @@ static const struct user_regset_view riscv_user_native_view = {
 	.n = ARRAY_SIZE(riscv_user_regset),
 };
 
+#ifdef CONFIG_RISCV_ISA_V
+void __init update_regset_vector_info(unsigned long size)
+{
+	riscv_user_regset[REGSET_V].n = (size + sizeof(struct __riscv_v_regset_state)) /
+					sizeof(__u32);
+}
+#endif
+
 struct pt_regs_offset {
 	const char *name;
 	int offset;
diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 601a321e0f17..d85916a3660c 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -39,7 +39,9 @@
 
 #include "head.h"
 
+#ifndef CONFIG_HOTPLUG_PARALLEL
 static DECLARE_COMPLETION(cpu_running);
+#endif
 
 void __init smp_prepare_cpus(unsigned int max_cpus)
 {
@@ -179,6 +181,12 @@ static int start_secondary_cpu(int cpu, struct task_struct *tidle)
 	return -EOPNOTSUPP;
 }
 
+#ifdef CONFIG_HOTPLUG_PARALLEL
+int arch_cpuhp_kick_ap_alive(unsigned int cpu, struct task_struct *tidle)
+{
+	return start_secondary_cpu(cpu, tidle);
+}
+#else
 int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 {
 	int ret = 0;
@@ -199,6 +207,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 
 	return ret;
 }
+#endif
 
 void __init smp_cpus_done(unsigned int max_cpus)
 {
@@ -225,6 +234,10 @@ asmlinkage __visible void smp_callin(void)
 	mmgrab(mm);
 	current->active_mm = mm;
 
+#ifdef CONFIG_HOTPLUG_PARALLEL
+	cpuhp_ap_sync_alive();
+#endif
+
 	store_cpu_topology(curr_cpuid);
 	notify_cpu_starting(curr_cpuid);
 
@@ -243,7 +256,9 @@ asmlinkage __visible void smp_callin(void)
 	 */
 	local_flush_icache_all();
 	local_flush_tlb_all();
+#ifndef CONFIG_HOTPLUG_PARALLEL
 	complete(&cpu_running);
+#endif
 	/*
 	 * Disable preemption before enabling interrupts, so we don't try to
 	 * schedule a CPU that hasn't actually started yet.
diff --git a/arch/riscv/kernel/sys_hwprobe.c b/arch/riscv/kernel/sys_hwprobe.c
index 199d13f86f31..0f701ace3bb9 100644
--- a/arch/riscv/kernel/sys_hwprobe.c
+++ b/arch/riscv/kernel/sys_hwprobe.c
@@ -109,6 +109,7 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
 		EXT_KEY(ZAAMO);
 		EXT_KEY(ZABHA);
 		EXT_KEY(ZACAS);
+		EXT_KEY(ZALASR);
 		EXT_KEY(ZALRSC);
 		EXT_KEY(ZAWRS);
 		EXT_KEY(ZBA);
@@ -122,6 +123,7 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
 		EXT_KEY(ZCB);
 		EXT_KEY(ZCMOP);
 		EXT_KEY(ZICBOM);
+		EXT_KEY(ZICBOP);
 		EXT_KEY(ZICBOZ);
 		EXT_KEY(ZICNTR);
 		EXT_KEY(ZICOND);
@@ -302,6 +304,11 @@ static void hwprobe_one_pair(struct riscv_hwprobe *pair,
 		if (hwprobe_ext0_has(cpus, RISCV_HWPROBE_EXT_ZICBOM))
 			pair->value = riscv_cbom_block_size;
 		break;
+	case RISCV_HWPROBE_KEY_ZICBOP_BLOCK_SIZE:
+		pair->value = 0;
+		if (hwprobe_ext0_has(cpus, RISCV_HWPROBE_EXT_ZICBOP))
+			pair->value = riscv_cbop_block_size;
+		break;
 	case RISCV_HWPROBE_KEY_HIGHEST_VIRT_ADDRESS:
 		pair->value = user_max_virt_addr();
 		break;
diff --git a/arch/riscv/kernel/vector.c b/arch/riscv/kernel/vector.c
index 901e67adf576..3ed071dab9d8 100644
--- a/arch/riscv/kernel/vector.c
+++ b/arch/riscv/kernel/vector.c
@@ -66,6 +66,8 @@ void __init riscv_v_setup_ctx_cache(void)
 	if (!(has_vector() || has_xtheadvector()))
 		return;
 
+	update_regset_vector_info(riscv_v_vsize);
+
 	riscv_v_user_cachep = kmem_cache_create_usercopy("riscv_vector_ctx",
 							 riscv_v_vsize, 16, SLAB_PANIC,
 							 0, riscv_v_vsize, NULL);