15 files changed, 82 insertions, 57 deletions

diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 7be36c1e1db6..0e3640e14eb1 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -106,7 +106,7 @@ extra-y				+= vmlinux.lds
 
 obj-$(CONFIG_RELOCATABLE)	+= reloc_$(BITS).o
 
-obj-$(CONFIG_PPC32)		+= entry_32.o setup_32.o early_32.o
+obj-$(CONFIG_PPC32)		+= entry_32.o setup_32.o early_32.o static_call.o
 obj-$(CONFIG_PPC64)		+= dma-iommu.o iommu.o
 obj-$(CONFIG_KGDB)		+= kgdb.o
 obj-$(CONFIG_BOOTX_TEXT)	+= btext.o
diff --git a/arch/powerpc/kernel/align.c b/arch/powerpc/kernel/align.c
index bbb4181621dd..bf96b954a4eb 100644
--- a/arch/powerpc/kernel/align.c
+++ b/arch/powerpc/kernel/align.c
@@ -349,6 +349,7 @@ int fix_alignment(struct pt_regs *regs)
 		if (op.type != CACHEOP + DCBZ)
 			return -EINVAL;
 		PPC_WARN_ALIGNMENT(dcbz, regs);
+		WARN_ON_ONCE(!user_mode(regs));
 		r = emulate_dcbz(op.ea, regs);
 	} else {
 		if (type == LARX || type == STCX)
diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c
index e9b597ed423c..91e0f4cf1db3 100644
--- a/arch/powerpc/kernel/eeh.c
+++ b/arch/powerpc/kernel/eeh.c
@@ -589,6 +589,7 @@ EXPORT_SYMBOL(eeh_check_failure);
 /**
  * eeh_pci_enable - Enable MMIO or DMA transfers for this slot
  * @pe: EEH PE
+ * @function: EEH option
  *
  * This routine should be called to reenable frozen MMIO or DMA
  * so that it would work correctly again. It's useful while doing
@@ -761,8 +762,8 @@ int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state stat
 }
 
 /**
- * eeh_set_pe_freset - Check the required reset for the indicated device
- * @data: EEH device
+ * eeh_set_dev_freset - Check the required reset for the indicated device
+ * @edev: EEH device
  * @flag: return value
  *
  * Each device might have its preferred reset type: fundamental or
@@ -801,6 +802,7 @@ static void eeh_pe_refreeze_passed(struct eeh_pe *root)
 /**
  * eeh_pe_reset_full - Complete a full reset process on the indicated PE
  * @pe: EEH PE
+ * @include_passed: include passed-through devices?
  *
  * This function executes a full reset procedure on a PE, including setting
  * the appropriate flags, performing a fundamental or hot reset, and then
@@ -937,6 +939,7 @@ static struct notifier_block eeh_device_nb = {
 
 /**
  * eeh_init - System wide EEH initialization
+ * @ops: struct to trace EEH operation callback functions
  *
  * It's the platform's job to call this from an arch_initcall().
  */
@@ -1442,6 +1445,7 @@ static int eeh_pe_reenable_devices(struct eeh_pe *pe, bool include_passed)
  * eeh_pe_reset - Issue PE reset according to specified type
  * @pe: EEH PE
  * @option: reset type
+ * @include_passed: include passed-through devices?
  *
  * The routine is called to reset the specified PE with the
  * indicated type, either fundamental reset or hot reset.
@@ -1513,12 +1517,12 @@ EXPORT_SYMBOL_GPL(eeh_pe_configure);
  * eeh_pe_inject_err - Injecting the specified PCI error to the indicated PE
  * @pe: the indicated PE
  * @type: error type
- * @function: error function
+ * @func: error function
  * @addr: address
  * @mask: address mask
  *
  * The routine is called to inject the specified PCI error, which
- * is determined by @type and @function, to the indicated PE for
+ * is determined by @type and @func, to the indicated PE for
  * testing purpose.
  */
 int eeh_pe_inject_err(struct eeh_pe *pe, int type, int func,
diff --git a/arch/powerpc/kernel/firmware.c b/arch/powerpc/kernel/firmware.c
index c7022c41cc31..20328f72f9f2 100644
--- a/arch/powerpc/kernel/firmware.c
+++ b/arch/powerpc/kernel/firmware.c
@@ -31,11 +31,10 @@ int __init check_kvm_guest(void)
 	if (!hyper_node)
 		return 0;
 
-	if (!of_device_is_compatible(hyper_node, "linux,kvm"))
-		return 0;
-
-	static_branch_enable(&kvm_guest);
+	if (of_device_is_compatible(hyper_node, "linux,kvm"))
+		static_branch_enable(&kvm_guest);
 
+	of_node_put(hyper_node);
 	return 0;
 }
 core_initcall(check_kvm_guest); // before kvm_guest_init()
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 9bdb95f5694f..2d596881b70e 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -755,7 +755,7 @@ _GLOBAL(mmu_pin_tlb)
 	cmplw	r6, r9
 	bdnzt	lt, 2b
 
-4:	LOAD_REG_IMMEDIATE(r8, 0xf0 | _PAGE_SPS | _PAGE_SH | _PAGE_PRESENT)
+4:	LOAD_REG_IMMEDIATE(r8, 0xf0 | _PAGE_DIRTY | _PAGE_SPS | _PAGE_SH | _PAGE_PRESENT)
 2:	ori	r0, r6, MD_EVALID
 	mtspr	SPRN_MD_CTR, r5
 	mtspr	SPRN_MD_EPN, r0
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index e5503420b6c6..ef8d1b1c234e 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -465,12 +465,21 @@ label:
 	bl	do_page_fault;						      \
 	b	interrupt_return
 
+/*
+ * Instruction TLB Error interrupt handlers may call InstructionStorage
+ * directly without clearing ESR, so the ESR at this point may be left over
+ * from a prior interrupt.
+ *
+ * In any case, do_page_fault for BOOK3E does not use ESR and always expects
+ * dsisr to be 0. ESR_DST from a prior store in particular would confuse fault
+ * handling.
+ */
 #define INSTRUCTION_STORAGE_EXCEPTION					      \
 	START_EXCEPTION(InstructionStorage)				      \
-	NORMAL_EXCEPTION_PROLOG(0x400, INST_STORAGE);		      \
-	mfspr	r5,SPRN_ESR;		/* Grab the ESR and save it */	      \
+	NORMAL_EXCEPTION_PROLOG(0x400, INST_STORAGE);			      \
+	li	r5,0;			/* Store 0 in regs->esr (dsisr) */    \
 	stw	r5,_ESR(r11);						      \
-	stw	r12, _DEAR(r11);	/* Pass SRR0 as arg2 */		      \
+	stw	r12, _DEAR(r11);	/* Set regs->dear (dar) to SRR0 */    \
 	prepare_transfer_to_handler;					      \
 	bl	do_page_fault;						      \
 	b	interrupt_return
diff --git a/arch/powerpc/kernel/hw_breakpoint_constraints.c b/arch/powerpc/kernel/hw_breakpoint_constraints.c
index 675d1f66ab72..42b967e3d85c 100644
--- a/arch/powerpc/kernel/hw_breakpoint_constraints.c
+++ b/arch/powerpc/kernel/hw_breakpoint_constraints.c
@@ -127,15 +127,6 @@ bool wp_check_constraints(struct pt_regs *regs, struct ppc_inst instr,
 	return false;
 }
 
-static int cache_op_size(void)
-{
-#ifdef __powerpc64__
-	return ppc64_caches.l1d.block_size;
-#else
-	return L1_CACHE_BYTES;
-#endif
-}
-
 void wp_get_instr_detail(struct pt_regs *regs, struct ppc_inst *instr,
 			 int *type, int *size, unsigned long *ea)
 {
@@ -147,14 +138,14 @@ void wp_get_instr_detail(struct pt_regs *regs, struct ppc_inst *instr,
 	analyse_instr(&op, regs, *instr);
 	*type = GETTYPE(op.type);
 	*ea = op.ea;
-#ifdef __powerpc64__
+
 	if (!(regs->msr & MSR_64BIT))
 		*ea &= 0xffffffffUL;
-#endif
+
 
 	*size = GETSIZE(op.type);
 	if (*type == CACHEOP) {
-		*size = cache_op_size();
+		*size = l1_dcache_bytes();
 		*ea &= ~(*size - 1);
 	} else if (*type == LOAD_VMX || *type == STORE_VMX) {
 		*ea &= ~(*size - 1);
diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
index de10a2697258..835b626cd476 100644
--- a/arch/powerpc/kernel/interrupt.c
+++ b/arch/powerpc/kernel/interrupt.c
@@ -266,7 +266,7 @@ static void check_return_regs_valid(struct pt_regs *regs)
 	if (trap_is_scv(regs))
 		return;
 
-	trap = regs->trap;
+	trap = TRAP(regs);
 	// EE in HV mode sets HSRRs like 0xea0
 	if (cpu_has_feature(CPU_FTR_HVMODE) && trap == INTERRUPT_EXTERNAL)
 		trap = 0xea0;
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index b1e43b69a559..0b7894eed58d 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -278,9 +278,6 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 		seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 			   proc_freq / 1000000, proc_freq % 1000000);
 
-	if (ppc_md.show_percpuinfo != NULL)
-		ppc_md.show_percpuinfo(m, cpu_id);
-
 	/* If we are a Freescale core do a simple check so
 	 * we dont have to keep adding cases in the future */
 	if (PVR_VER(pvr) & 0x8000) {
diff --git a/arch/powerpc/kernel/static_call.c b/arch/powerpc/kernel/static_call.c
new file mode 100644
index 000000000000..863a7aa24650
--- /dev/null
+++ b/arch/powerpc/kernel/static_call.c
@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/memory.h>
+#include <linux/static_call.h>
+
+#include <asm/code-patching.h>
+
+void arch_static_call_transform(void *site, void *tramp, void *func, bool tail)
+{
+	int err;
+	bool is_ret0 = (func == __static_call_return0);
+	unsigned long target = (unsigned long)(is_ret0 ? tramp + PPC_SCT_RET0 : func);
+	bool is_short = is_offset_in_branch_range((long)target - (long)tramp);
+
+	if (!tramp)
+		return;
+
+	mutex_lock(&text_mutex);
+
+	if (func && !is_short) {
+		err = patch_instruction(tramp + PPC_SCT_DATA, ppc_inst(target));
+		if (err)
+			goto out;
+	}
+
+	if (!func)
+		err = patch_instruction(tramp, ppc_inst(PPC_RAW_BLR()));
+	else if (is_short)
+		err = patch_branch(tramp, target, 0);
+	else
+		err = patch_instruction(tramp, ppc_inst(PPC_RAW_NOP()));
+out:
+	mutex_unlock(&text_mutex);
+
+	if (err)
+		panic("%s: patching failed %pS at %pS\n", __func__, func, tramp);
+}
+EXPORT_SYMBOL_GPL(arch_static_call_transform);
diff --git a/arch/powerpc/kernel/swsusp_64.c b/arch/powerpc/kernel/swsusp_64.c
index aeea97ad85cf..16ee3baaf09a 100644
--- a/arch/powerpc/kernel/swsusp_64.c
+++ b/arch/powerpc/kernel/swsusp_64.c
@@ -17,8 +17,3 @@ void do_after_copyback(void)
 	touch_softlockup_watchdog();
 	mb();
 }
-
-void _iommu_save(void)
-{
-	iommu_save();
-}
diff --git a/arch/powerpc/kernel/swsusp_asm64.S b/arch/powerpc/kernel/swsusp_asm64.S
index 6d3189830dd3..96bb20715aa9 100644
--- a/arch/powerpc/kernel/swsusp_asm64.S
+++ b/arch/powerpc/kernel/swsusp_asm64.S
@@ -128,7 +128,6 @@ END_FW_FTR_SECTION_IFCLR(FW_FEATURE_LPAR)
 	 * stack pointer on the stack like a real stackframe */
 	addi	r1,r1,-128
 
-	bl _iommu_save
 	bl swsusp_save
 
 	/* restore LR */
diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index defecb3b1b15..08d8072d6e7a 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -928,7 +928,8 @@ static int unregister_cpu_online(unsigned int cpu)
 	struct device_attribute *attrs, *pmc_attrs;
 	int i, nattrs;
 
-	BUG_ON(!c->hotpluggable);
+	if (WARN_RATELIMIT(!c->hotpluggable, "cpu %d can't be offlined\n", cpu))
+		return -EBUSY;
 
 #ifdef CONFIG_PPC64
 	if (cpu_has_feature(CPU_FTR_SMT))
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 934d8ae66cc6..cae8f03a44fe 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -631,8 +631,12 @@ void timer_broadcast_interrupt(void)
 #endif
 
 #ifdef CONFIG_SUSPEND
-static void generic_suspend_disable_irqs(void)
+/* Overrides the weak version in kernel/power/main.c */
+void arch_suspend_disable_irqs(void)
 {
+	if (ppc_md.suspend_disable_irqs)
+		ppc_md.suspend_disable_irqs();
+
 	/* Disable the decrementer, so that it doesn't interfere
 	 * with suspending.
 	 */
@@ -642,23 +646,11 @@ static void generic_suspend_disable_irqs(void)
 	set_dec(decrementer_max);
 }
 
-static void generic_suspend_enable_irqs(void)
-{
-	local_irq_enable();
-}
-
-/* Overrides the weak version in kernel/power/main.c */
-void arch_suspend_disable_irqs(void)
-{
-	if (ppc_md.suspend_disable_irqs)
-		ppc_md.suspend_disable_irqs();
-	generic_suspend_disable_irqs();
-}
-
 /* Overrides the weak version in kernel/power/main.c */
 void arch_suspend_enable_irqs(void)
 {
-	generic_suspend_enable_irqs();
+	local_irq_enable();
+
 	if (ppc_md.suspend_enable_irqs)
 		ppc_md.suspend_enable_irqs();
 }
diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S
index 40bdefe9caa7..18e42c74abdd 100644
--- a/arch/powerpc/kernel/vmlinux.lds.S
+++ b/arch/powerpc/kernel/vmlinux.lds.S
@@ -143,6 +143,12 @@ SECTIONS
 	SOFT_MASK_TABLE(8)
 	RESTART_TABLE(8)
 
+	.opd : AT(ADDR(.opd) - LOAD_OFFSET) {
+		__start_opd = .;
+		KEEP(*(.opd))
+		__end_opd = .;
+	}
+
 	. = ALIGN(8);
 	__stf_entry_barrier_fixup : AT(ADDR(__stf_entry_barrier_fixup) - LOAD_OFFSET) {
 		__start___stf_entry_barrier_fixup = .;
@@ -339,12 +345,6 @@ SECTIONS
 		*(.branch_lt)
 	}
 
-	.opd : AT(ADDR(.opd) - LOAD_OFFSET) {
-		__start_opd = .;
-		KEEP(*(.opd))
-		__end_opd = .;
-	}
-
 	. = ALIGN(256);
 	.got : AT(ADDR(.got) - LOAD_OFFSET) {
 		__toc_start = .;