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Message-Id: <20240823103936.25092-2-zhangtianyang@loongson.cn>
Date: Fri, 23 Aug 2024 18:39:33 +0800
From: Tianyang Zhang <zhangtianyang@...ngson.cn>
To: corbet@....net,
alexs@...nel.org,
chenhuacai@...nel.org,
kernel@...0n.name,
tglx@...utronix.de,
jiaxun.yang@...goat.com,
gaoliang@...ngson.cn,
wangliupu@...ngson.cn,
lvjianmin@...ngson.cn,
zhangtianyang@...ngson.cn,
yijun@...ngson.cn,
mhocko@...e.com,
akpm@...ux-foundation.org,
dianders@...omium.org,
maobibo@...ngson.cn,
xry111@...111.site,
zhaotianrui@...ngson.cn,
nathan@...nel.org,
yangtiezhu@...ngson.cn,
zhoubinbin@...ngson.cn
Cc: loongarch@...ts.linux.dev,
linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org,
Huacai Chen <chenhuacai@...ngson.cn>
Subject: [PATCH v11 4/7] LoongArch: Architectural preparation for AVEC irqchip
From: Huacai Chen <chenhuacai@...ngson.cn>
Add architectural preparation for AVEC irqchip, including:
1. CPUCFG feature bits definition for AVEC;
2. Detection of AVEC irqchip in cpu_probe();
3. New IPI type definition (IPI_CLEAR_VECTOR) for AVEC;
4. Provide arch_probe_nr_irqs() for large NR_IRQS;
5. Other related changes about the number of interrupts.
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
Signed-off-by: Tianyang Zhang <zhangtianyang@...ngson.cn>
---
arch/loongarch/include/asm/cpu-features.h | 1 +
arch/loongarch/include/asm/cpu.h | 2 ++
arch/loongarch/include/asm/hardirq.h | 3 ++-
arch/loongarch/include/asm/irq.h | 15 +++++++++++++--
arch/loongarch/include/asm/loongarch.h | 18 ++++++++++++++----
arch/loongarch/include/asm/smp.h | 2 ++
arch/loongarch/kernel/cpu-probe.c | 3 ++-
arch/loongarch/kernel/irq.c | 12 ++++++++++++
8 files changed, 48 insertions(+), 8 deletions(-)
diff --git a/arch/loongarch/include/asm/cpu-features.h b/arch/loongarch/include/asm/cpu-features.h
index 2eafe6a6aca8..16a716f88a5c 100644
--- a/arch/loongarch/include/asm/cpu-features.h
+++ b/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 */
diff --git a/arch/loongarch/include/asm/cpu.h b/arch/loongarch/include/asm/cpu.h
index 48b9f7168bcc..843f9c4ec980 100644
--- a/arch/loongarch/include/asm/cpu.h
+++ b/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 */
diff --git a/arch/loongarch/include/asm/hardirq.h b/arch/loongarch/include/asm/hardirq.h
index 1d7feb719515..10da8d6961cb 100644
--- a/arch/loongarch/include/asm/hardirq.h
+++ b/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 {
diff --git a/arch/loongarch/include/asm/irq.h b/arch/loongarch/include/asm/irq.h
index 65503c9eb529..c4835800c8b9 100644
--- a/arch/loongarch/include/asm/irq.h
+++ b/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)
diff --git a/arch/loongarch/include/asm/loongarch.h b/arch/loongarch/include/asm/loongarch.h
index 04a78010fc72..631d249b3ef2 100644
--- a/arch/loongarch/include/asm/loongarch.h
+++ b/arch/loongarch/include/asm/loongarch.h
@@ -253,8 +253,8 @@
#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 */
@@ -649,6 +649,13 @@
#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 */
@@ -1011,7 +1018,7 @@
/*
* 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
@@ -1054,6 +1061,7 @@
#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
@@ -1065,6 +1073,7 @@
#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
@@ -1387,9 +1396,10 @@ __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)
diff --git a/arch/loongarch/include/asm/smp.h b/arch/loongarch/include/asm/smp.h
index 50db503f44e3..3383c9d24e94 100644
--- a/arch/loongarch/include/asm/smp.h
+++ b/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;
diff --git a/arch/loongarch/kernel/cpu-probe.c b/arch/loongarch/kernel/cpu-probe.c
index 55320813ee08..14f0449f5452 100644
--- a/arch/loongarch/kernel/cpu-probe.c
+++ b/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;
diff --git a/arch/loongarch/kernel/irq.c b/arch/loongarch/kernel/irq.c
index adac8fcbb2ac..d129039b368b 100644
--- a/arch/loongarch/kernel/irq.c
+++ b/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;
--
2.20.1
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