Merge tag 'irq-core-2024-09-16' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irq updates from Thomas Gleixner:
 "Core:

   - Remove a global lock in the affinity setting code

     The lock protects a cpumask for intermediate results and the lock
     causes a bottleneck on simultaneous start of multiple virtual
     machines. Replace the lock and the static cpumask with a per CPU
     cpumask which is nicely serialized by raw spinlock held when
     executing this code.

   - Provide support for giving a suffix to interrupt domain names.

     That's required to support devices with subfunctions so that the
     domain names are distinct even if they originate from the same
     device node.

   - The usual set of cleanups and enhancements all over the place

  Drivers:

   - Support for longarch AVEC interrupt chip

   - Refurbishment of the Armada driver so it can be extended for new
     variants.

   - The usual set of cleanups and enhancements all over the place"

* tag 'irq-core-2024-09-16' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (73 commits)
  genirq: Use cpumask_intersects()
  genirq/cpuhotplug: Use cpumask_intersects()
  irqchip/apple-aic: Only access system registers on SoCs which provide them
  irqchip/apple-aic: Add a new "Global fast IPIs only" feature level
  irqchip/apple-aic: Skip unnecessary enabling of use_fast_ipi
  dt-bindings: apple,aic: Document A7-A11 compatibles
  irqdomain: Use IS_ERR_OR_NULL() in irq_domain_trim_hierarchy()
  genirq/msi: Use kmemdup_array() instead of kmemdup()
  genirq/proc: Change the return value for set affinity permission error
  genirq/proc: Use irq_move_pending() in show_irq_affinity()
  genirq/proc: Correctly set file permissions for affinity control files
  genirq: Get rid of global lock in irq_do_set_affinity()
  genirq: Fix typo in struct comment
  irqchip/loongarch-avec: Add AVEC irqchip support
  irqchip/loongson-pch-msi: Prepare get_pch_msi_handle() for AVECINTC
  irqchip/loongson-eiointc: Rename CPUHP_AP_IRQ_LOONGARCH_STARTING
  LoongArch: Architectural preparation for AVEC irqchip
  LoongArch: Move irqchip function prototypes to irq-loongson.h
  irqchip/loongson-pch-msi: Switch to MSI parent domains
  softirq: Remove unused 'action' parameter from action callback
  ...

Author: torvalds

Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml

@@ -31,13 +31,25 @@ description: |
   This device also represents the FIQ interrupt sources on platforms using AIC,
   which do not go through a discrete interrupt controller.
 
+  IPIs may be performed via MMIO registers on all variants of AIC. Starting
+  from A11, system registers may also be used for "fast" IPIs. Starting from
+  M1, even faster IPIs within the same cluster may be achieved by writing to
+  a "local" fast IPI register as opposed to using the "global" fast IPI
+  register.
+
 allOf:
   - $ref: /schemas/interrupt-controller.yaml#
 
 properties:
   compatible:
     items:
-      - const: apple,t8103-aic
+      - enum:
+          - apple,s5l8960x-aic
+          - apple,t7000-aic
+          - apple,s8000-aic
+          - apple,t8010-aic
+          - apple,t8015-aic
+          - apple,t8103-aic
       - const: apple,aic
 
   interrupt-controller: true

arch/loongarch/Kconfig

@@ -85,6 +85,7 @@ config LOONGARCH
 	select GENERIC_ENTRY
 	select GENERIC_GETTIMEOFDAY
 	select GENERIC_IOREMAP if !ARCH_IOREMAP
+	select GENERIC_IRQ_MATRIX_ALLOCATOR
 	select GENERIC_IRQ_MULTI_HANDLER
 	select GENERIC_IRQ_PROBE
 	select GENERIC_IRQ_SHOW

arch/loongarch/include/asm/cpu-features.h

@@ -65,5 +65,6 @@
 #define cpu_has_guestid		cpu_opt(LOONGARCH_CPU_GUESTID)
 #define cpu_has_hypervisor	cpu_opt(LOONGARCH_CPU_HYPERVISOR)
 #define cpu_has_ptw		cpu_opt(LOONGARCH_CPU_PTW)
+#define cpu_has_avecint		cpu_opt(LOONGARCH_CPU_AVECINT)
 
 #endif /* __ASM_CPU_FEATURES_H */

arch/loongarch/include/asm/cpu.h

@@ -99,6 +99,7 @@ enum cpu_type_enum {
 #define CPU_FEATURE_GUESTID		24	/* CPU has GuestID feature */
 #define CPU_FEATURE_HYPERVISOR		25	/* CPU has hypervisor (running in VM) */
 #define CPU_FEATURE_PTW			26	/* CPU has hardware page table walker */
+#define CPU_FEATURE_AVECINT		27	/* CPU has avec interrupt */
 
 #define LOONGARCH_CPU_CPUCFG		BIT_ULL(CPU_FEATURE_CPUCFG)
 #define LOONGARCH_CPU_LAM		BIT_ULL(CPU_FEATURE_LAM)
@@ -127,5 +128,6 @@ enum cpu_type_enum {
 #define LOONGARCH_CPU_GUESTID		BIT_ULL(CPU_FEATURE_GUESTID)
 #define LOONGARCH_CPU_HYPERVISOR	BIT_ULL(CPU_FEATURE_HYPERVISOR)
 #define LOONGARCH_CPU_PTW		BIT_ULL(CPU_FEATURE_PTW)
+#define LOONGARCH_CPU_AVECINT		BIT_ULL(CPU_FEATURE_AVECINT)
 
 #endif /* _ASM_CPU_H */

arch/loongarch/include/asm/hardirq.h

@@ -12,12 +12,13 @@
 extern void ack_bad_irq(unsigned int irq);
 #define ack_bad_irq ack_bad_irq
 
-#define NR_IPI	3
+#define NR_IPI	4
 
 enum ipi_msg_type {
 	IPI_RESCHEDULE,
 	IPI_CALL_FUNCTION,
 	IPI_IRQ_WORK,
+	IPI_CLEAR_VECTOR,
 };
 
 typedef struct {

arch/loongarch/include/asm/irq.h

@@ -39,11 +39,22 @@ void spurious_interrupt(void);
 
 #define NR_IRQS_LEGACY 16
 
+/*
+ * 256 Vectors Mapping for AVECINTC:
+ *
+ * 0 - 15: Mapping classic IPs, e.g. IP0-12.
+ * 16 - 255: Mapping vectors for external IRQ.
+ *
+ */
+#define NR_VECTORS		256
+#define NR_LEGACY_VECTORS	16
+#define IRQ_MATRIX_BITS		NR_VECTORS
+
 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
 void arch_trigger_cpumask_backtrace(const struct cpumask *mask, int exclude_cpu);
 
 #define MAX_IO_PICS 2
-#define NR_IRQS	(64 + (256 * MAX_IO_PICS))
+#define NR_IRQS	(64 + NR_VECTORS * (NR_CPUS + MAX_IO_PICS))
 
 struct acpi_vector_group {
 	int node;
@@ -65,7 +76,7 @@ extern struct acpi_vector_group msi_group[MAX_IO_PICS];
 #define LOONGSON_LPC_LAST_IRQ		(LOONGSON_LPC_IRQ_BASE + 15)
 
 #define LOONGSON_CPU_IRQ_BASE		16
-#define LOONGSON_CPU_LAST_IRQ		(LOONGSON_CPU_IRQ_BASE + 14)
+#define LOONGSON_CPU_LAST_IRQ		(LOONGSON_CPU_IRQ_BASE + 15)
 
 #define LOONGSON_PCH_IRQ_BASE		64
 #define LOONGSON_PCH_ACPI_IRQ		(LOONGSON_PCH_IRQ_BASE + 47)
@@ -88,20 +99,8 @@ struct acpi_madt_bio_pic;
 struct acpi_madt_msi_pic;
 struct acpi_madt_lpc_pic;
 
-int liointc_acpi_init(struct irq_domain *parent,
-					struct acpi_madt_lio_pic *acpi_liointc);
-int eiointc_acpi_init(struct irq_domain *parent,
-					struct acpi_madt_eio_pic *acpi_eiointc);
-
-int htvec_acpi_init(struct irq_domain *parent,
-					struct acpi_madt_ht_pic *acpi_htvec);
-int pch_lpc_acpi_init(struct irq_domain *parent,
-					struct acpi_madt_lpc_pic *acpi_pchlpc);
-int pch_msi_acpi_init(struct irq_domain *parent,
-					struct acpi_madt_msi_pic *acpi_pchmsi);
-int pch_pic_acpi_init(struct irq_domain *parent,
-					struct acpi_madt_bio_pic *acpi_pchpic);
-int find_pch_pic(u32 gsi);
+void complete_irq_moving(void);
+
 struct fwnode_handle *get_pch_msi_handle(int pci_segment);
 
 extern struct acpi_madt_lio_pic *acpi_liointc;

arch/loongarch/include/asm/loongarch.h

@@ -246,8 +246,8 @@
 #define  CSR_ESTAT_EXC_WIDTH		6
 #define  CSR_ESTAT_EXC			(_ULCAST_(0x3f) << CSR_ESTAT_EXC_SHIFT)
 #define  CSR_ESTAT_IS_SHIFT		0
-#define  CSR_ESTAT_IS_WIDTH		14
-#define  CSR_ESTAT_IS			(_ULCAST_(0x3fff) << CSR_ESTAT_IS_SHIFT)
+#define  CSR_ESTAT_IS_WIDTH		15
+#define  CSR_ESTAT_IS			(_ULCAST_(0x7fff) << CSR_ESTAT_IS_SHIFT)
 
 #define LOONGARCH_CSR_ERA		0x6	/* ERA */
 
@@ -642,6 +642,13 @@
 
 #define LOONGARCH_CSR_CTAG		0x98	/* TagLo + TagHi */
 
+#define LOONGARCH_CSR_ISR0		0xa0
+#define LOONGARCH_CSR_ISR1		0xa1
+#define LOONGARCH_CSR_ISR2		0xa2
+#define LOONGARCH_CSR_ISR3		0xa3
+
+#define LOONGARCH_CSR_IRR		0xa4
+
 #define LOONGARCH_CSR_PRID		0xc0
 
 /* Shadow MCSR : 0xc0 ~ 0xff */
@@ -1004,7 +1011,7 @@
 /*
  * CSR_ECFG IM
  */
-#define ECFG0_IM		0x00001fff
+#define ECFG0_IM		0x00005fff
 #define ECFGB_SIP0		0
 #define ECFGF_SIP0		(_ULCAST_(1) << ECFGB_SIP0)
 #define ECFGB_SIP1		1
@@ -1047,6 +1054,7 @@
 #define  IOCSRF_EIODECODE		BIT_ULL(9)
 #define  IOCSRF_FLATMODE		BIT_ULL(10)
 #define  IOCSRF_VM			BIT_ULL(11)
+#define  IOCSRF_AVEC			BIT_ULL(15)
 
 #define LOONGARCH_IOCSR_VENDOR		0x10
 
@@ -1058,6 +1066,7 @@
 #define  IOCSR_MISC_FUNC_SOFT_INT	BIT_ULL(10)
 #define  IOCSR_MISC_FUNC_TIMER_RESET	BIT_ULL(21)
 #define  IOCSR_MISC_FUNC_EXT_IOI_EN	BIT_ULL(48)
+#define  IOCSR_MISC_FUNC_AVEC_EN	BIT_ULL(51)
 
 #define LOONGARCH_IOCSR_CPUTEMP		0x428
 
@@ -1380,9 +1389,10 @@ __BUILD_CSR_OP(tlbidx)
 #define INT_TI		11	/* Timer */
 #define INT_IPI		12
 #define INT_NMI		13
+#define INT_AVEC	14
 
 /* ExcCodes corresponding to interrupts */
-#define EXCCODE_INT_NUM		(INT_NMI + 1)
+#define EXCCODE_INT_NUM		(INT_AVEC + 1)
 #define EXCCODE_INT_START	64
 #define EXCCODE_INT_END		(EXCCODE_INT_START + EXCCODE_INT_NUM - 1)
 

arch/loongarch/include/asm/smp.h

@@ -70,10 +70,12 @@ extern int __cpu_logical_map[NR_CPUS];
 #define ACTION_RESCHEDULE	1
 #define ACTION_CALL_FUNCTION	2
 #define ACTION_IRQ_WORK		3
+#define ACTION_CLEAR_VECTOR	4
 #define SMP_BOOT_CPU		BIT(ACTION_BOOT_CPU)
 #define SMP_RESCHEDULE		BIT(ACTION_RESCHEDULE)
 #define SMP_CALL_FUNCTION	BIT(ACTION_CALL_FUNCTION)
 #define SMP_IRQ_WORK		BIT(ACTION_IRQ_WORK)
+#define SMP_CLEAR_VECTOR	BIT(ACTION_CLEAR_VECTOR)
 
 struct secondary_data {
 	unsigned long stack;

arch/loongarch/kernel/cpu-probe.c

@@ -106,7 +106,6 @@ static void cpu_probe_common(struct cpuinfo_loongarch *c)
 		elf_hwcap |= HWCAP_LOONGARCH_CRC32;
 	}
 
-
 	config = read_cpucfg(LOONGARCH_CPUCFG2);
 	if (config & CPUCFG2_LAM) {
 		c->options |= LOONGARCH_CPU_LAM;
@@ -174,6 +173,8 @@ static void cpu_probe_common(struct cpuinfo_loongarch *c)
 		c->options |= LOONGARCH_CPU_FLATMODE;
 	if (config & IOCSRF_EIODECODE)
 		c->options |= LOONGARCH_CPU_EIODECODE;
+	if (config & IOCSRF_AVEC)
+		c->options |= LOONGARCH_CPU_AVECINT;
 	if (config & IOCSRF_VM)
 		c->options |= LOONGARCH_CPU_HYPERVISOR;
 

arch/loongarch/kernel/irq.c

@@ -87,6 +87,18 @@ static void __init init_vec_parent_group(void)
 	acpi_table_parse(ACPI_SIG_MCFG, early_pci_mcfg_parse);
 }
 
+int __init arch_probe_nr_irqs(void)
+{
+	int nr_io_pics = bitmap_weight(loongson_sysconf.cores_io_master, NR_CPUS);
+
+	if (!cpu_has_avecint)
+		nr_irqs = (64 + NR_VECTORS * nr_io_pics);
+	else
+		nr_irqs = (64 + NR_VECTORS * (nr_cpu_ids + nr_io_pics));
+
+	return NR_IRQS_LEGACY;
+}
+
 void __init init_IRQ(void)
 {
 	int i;