!765 LoongArch: fix some stability issues

Merge Pull Request from: @Hongchen_Zhang 
 
LoongArch: fix the following issues:
- Modify loongson3_defconfig to support the cachefilesd service
- Loongson: i2c fixes the issue of interrupt not freed after remove the module
- Fix page table property operation issues
- Fix kernel crash triggered by ltp io_uring02 testcase
- Fix nvme timeout issue triggered by LTP cpuhotplug testcase
- Fix double bridge machine boot failed 
 
Link:https://gitee.com/openeuler/kernel/pulls/765 

Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com> 
Reviewed-by: Guo Dongtai <guodongtai@kylinos.cn> 
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com> 

arch/loongarch/Kconfig

@@ -395,13 +395,12 @@ config SMP
 config HOTPLUG_CPU
 	bool "Support for hot-pluggable CPUs"
 	depends on SMP
-	select GENERIC_IRQ_MIGRATION
 	help
-	  Say Y here to allow turning CPUs off and on. CPUs can be
-	  controlled through /sys/devices/system/cpu.
-	  (Note: power management support will enable this option
-	    automatically on SMP systems. )
-	  Say N if you want to disable CPU hotplug.
+	Say Y here to allow turning CPUs off and on. CPUs can be
+	controlled through /sys/devices/system/cpu.
+	(Note: power management support will enable this option
+	automatically on SMP systems. )
+	Say N if you want to disable CPU hotplug.
 
 config NR_CPUS
 	int "Maximum number of CPUs (2-256)"

arch/loongarch/configs/loongson3_defconfig

@@ -983,6 +983,7 @@ CONFIG_OVERLAY_FS_INDEX=y
 CONFIG_OVERLAY_FS_XINO_AUTO=y
 CONFIG_OVERLAY_FS_METACOPY=y
 CONFIG_FSCACHE=y
+CONFIG_CACHEFILES=m
 CONFIG_ISO9660_FS=y
 CONFIG_JOLIET=y
 CONFIG_ZISOFS=y

arch/loongarch/include/asm/irq.h

@@ -119,6 +119,7 @@ extern struct fwnode_handle *pch_lpc_handle;
 extern struct fwnode_handle *pch_pic_handle[MAX_IO_PICS];
 
 extern irqreturn_t loongson3_ipi_interrupt(int irq, void *dev);
+extern void fixup_irqs(void);
 
 #include <asm-generic/irq.h>
 

arch/loongarch/include/asm/pgtable.h

@@ -361,13 +361,17 @@ static inline pte_t pte_mkclean(pte_t pte)
 
 static inline pte_t pte_mkdirty(pte_t pte)
 {
-	pte_val(pte) |= (_PAGE_DIRTY | _PAGE_MODIFIED);
+	pte_val(pte) |= _PAGE_MODIFIED;
+	if (pte_val(pte) & _PAGE_WRITE)
+		pte_val(pte) |= _PAGE_DIRTY;
 	return pte;
 }
 
 static inline pte_t pte_mkwrite(pte_t pte)
 {
-	pte_val(pte) |= (_PAGE_WRITE | _PAGE_DIRTY);
+	pte_val(pte) |= _PAGE_WRITE;
+	if (pte_val(pte) & _PAGE_MODIFIED)
+		pte_val(pte) |= _PAGE_DIRTY;
 	return pte;
 }
 
@@ -464,7 +468,9 @@ static inline int pmd_write(pmd_t pmd)
 
 static inline pmd_t pmd_mkwrite(pmd_t pmd)
 {
-	pmd_val(pmd) |= (_PAGE_WRITE | _PAGE_DIRTY);
+	pmd_val(pmd) |= _PAGE_WRITE;
+	if (pmd_val(pmd) & _PAGE_MODIFIED)
+		pmd_val(pmd) |= _PAGE_DIRTY;
 	return pmd;
 }
 
@@ -487,7 +493,9 @@ static inline pmd_t pmd_mkclean(pmd_t pmd)
 
 static inline pmd_t pmd_mkdirty(pmd_t pmd)
 {
-	pmd_val(pmd) |= (_PAGE_DIRTY | _PAGE_MODIFIED);
+	pmd_val(pmd) |= _PAGE_MODIFIED;
+	if (pmd_val(pmd) & _PAGE_WRITE)
+		pmd_val(pmd) |= _PAGE_DIRTY;
 	return pmd;
 }
 

arch/loongarch/kernel/irq.c

@@ -96,6 +96,42 @@ static int __init get_ipi_irq(void)
 	return -EINVAL;
 }
 
+#ifdef CONFIG_HOTPLUG_CPU
+static void handle_irq_affinity(void)
+{
+	struct irq_desc *desc;
+	struct irq_chip *chip;
+	unsigned int irq;
+	unsigned long flags;
+	struct cpumask *affinity;
+
+	for_each_active_irq(irq) {
+		desc = irq_to_desc(irq);
+		if (!desc)
+			continue;
+
+		raw_spin_lock_irqsave(&desc->lock, flags);
+
+		affinity = desc->irq_data.common->affinity;
+		if (!cpumask_intersects(affinity, cpu_online_mask))
+			cpumask_copy(affinity, cpu_online_mask);
+
+		chip = irq_data_get_irq_chip(&desc->irq_data);
+		if (chip && chip->irq_set_affinity)
+			chip->irq_set_affinity(&desc->irq_data,
+					desc->irq_data.common->affinity, true);
+		raw_spin_unlock_irqrestore(&desc->lock, flags);
+	}
+}
+
+void fixup_irqs(void)
+{
+	handle_irq_affinity();
+	irq_cpu_offline();
+	clear_csr_ecfg(ECFG0_IM);
+}
+#endif
+
 void __init init_IRQ(void)
 {
 	int i, ret;

arch/loongarch/kernel/process.c

@@ -156,7 +156,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 		childregs->csr_crmd = p->thread.csr_crmd;
 		childregs->csr_prmd = p->thread.csr_prmd;
 		childregs->csr_ecfg = p->thread.csr_ecfg;
-		return 0;
+		goto out;
 	}
 
 	/* user thread */
@@ -175,14 +175,15 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 	 */
 	childregs->csr_euen = 0;
 
+	if (clone_flags & CLONE_SETTLS)
+		childregs->regs[2] = tls;
+
+out:
 	clear_tsk_thread_flag(p, TIF_USEDFPU);
 	clear_tsk_thread_flag(p, TIF_USEDSIMD);
 	clear_tsk_thread_flag(p, TIF_LSX_CTX_LIVE);
 	clear_tsk_thread_flag(p, TIF_LASX_CTX_LIVE);
 
-	if (clone_flags & CLONE_SETTLS)
-		childregs->regs[2] = tls;
-
 	return 0;
 }
 

arch/loongarch/kernel/smp.c

@@ -272,8 +272,7 @@ int loongson3_cpu_disable(void)
 	set_cpu_online(cpu, false);
 	calculate_cpu_foreign_map();
 	local_irq_save(flags);
-	irq_migrate_all_off_this_cpu();
-	clear_csr_ecfg(ECFG0_IM);
+	fixup_irqs();
 	local_irq_restore(flags);
 	local_flush_tlb_all();
 

drivers/i2c/busses/i2c-loongson.c

@@ -508,6 +508,7 @@ static int loongson_i2c_remove(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, NULL);
 	i2c_del_adapter(&dev->adapter);
+	free_irq(dev->irq, dev);
 	iounmap(dev->base);
 	kfree(dev);
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);

drivers/irqchip/irq-loongson-pch-pic.c

@@ -392,14 +392,12 @@ static int __init acpi_cascade_irqdomain_init(void)
 int __init pch_pic_acpi_init(struct irq_domain *parent,
 					struct acpi_madt_bio_pic *acpi_pchpic)
 {
-	int ret, vec_base;
+	int ret;
 	struct fwnode_handle *domain_handle;
 
 	if (find_pch_pic(acpi_pchpic->gsi_base) >= 0)
 		return 0;
 
-	vec_base = acpi_pchpic->gsi_base - GSI_MIN_PCH_IRQ;
-
 	domain_handle = irq_domain_alloc_fwnode(&acpi_pchpic->address);
 	if (!domain_handle) {
 		pr_err("Unable to allocate domain handle\n");
@@ -407,7 +405,7 @@ int __init pch_pic_acpi_init(struct irq_domain *parent,
 	}
 
 	ret = pch_pic_init(acpi_pchpic->address, acpi_pchpic->size,
-				vec_base, parent, domain_handle, acpi_pchpic->gsi_base);
+				0, parent, domain_handle, acpi_pchpic->gsi_base);
 
 	if (ret < 0) {
 		irq_domain_free_fwnode(domain_handle);