[Crash-utility] [RESEND PATCH v2 08/10] LoongArch64: Add 'irq' command support

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Added support for the 'irq' series of commands in the LoongArch64
architecture, except for the 'irq -d' command, others can be used.

The result of using the 'irq' command without this patch is as follows:
crash> irq
 IRQ   IRQ_DESC/_DATA      IRQACTION      NAME
 ...
 16   9000000090423c00  9000000000f4c500
 17   9000000090423e00  9000000000f4c500
 18   9000000090495c00  9000000000f4c500
 19   9000000090494a00  9000000000f4c500
 20   9000000090496400  9000000090418480  "IPI"
 21   9000000090496200  9000000090418500  "timer"
 22   9000000090cb2600  9000000090d9c780  "acpi"
 23   9000000090cb3c00      (unused)
 24   9000000090cb1800      (unused)
 25   9000000090cb0800  900000009117f580  "loongson_i2c"
                        900000009117ee80  "loongson_i2c"
                        900000009117cc00  "loongson_i2c"
                        900000009117e800  "loongson_i2c"
                        900000009117c780  "loongson_i2c"
                        900000009117df00  "loongson_i2c"
...

Co-developed-by: Youling Tang <tangyouling@xxxxxxxxxxx>
Signed-off-by: Youling Tang <tangyouling@xxxxxxxxxxx>
Signed-off-by: Ming Wang <wangming01@xxxxxxxxxxx>
---
 loongarch64.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/loongarch64.c b/loongarch64.c
index ee07b4c..6c5ebd3 100644
--- a/loongarch64.c
+++ b/loongarch64.c
@@ -1156,6 +1156,9 @@ loongarch64_dump_machdep_table(ulong arg)
 	fprintf(fp, "       is_task_addr: loongarch64_is_task_addr()\n");
 	fprintf(fp, "      verify_symbol: loongarch64_verify_symbol()\n");
 	fprintf(fp, "         dis_filter: generic_dis_filter()\n");
+	fprintf(fp, "           dump_irq: generic_dump_irq()\n");
+	fprintf(fp, "    show_interrupts: generic_show_interrupts()\n");
+	fprintf(fp, "   get_irq_affinity: generic_get_irq_affinity()\n");
 	fprintf(fp, "           cmd_mach: loongarch64_cmd_mach()\n");
 	fprintf(fp, "       get_smp_cpus: loongarch64_get_smp_cpus()\n");
 	fprintf(fp, "          is_kvaddr: generic_is_kvaddr()\n");
@@ -1238,6 +1241,9 @@ loongarch64_init(int when)
 		machdep->is_task_addr = loongarch64_is_task_addr;
 		machdep->get_smp_cpus = loongarch64_get_smp_cpus;
 		machdep->dis_filter = generic_dis_filter;
+		machdep->dump_irq = generic_dump_irq;
+		machdep->show_interrupts = generic_show_interrupts;
+		machdep->get_irq_affinity = generic_get_irq_affinity;
 		machdep->value_to_symbol = generic_machdep_value_to_symbol;
 		machdep->init_kernel_pgd = NULL;
 		break;
@@ -1245,7 +1251,16 @@ loongarch64_init(int when)
 	case POST_GDB:
 		machdep->section_size_bits = _SECTION_SIZE_BITS;
 		machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
+
+		if (symbol_exists("irq_desc"))
+			ARRAY_LENGTH_INIT(machdep->nr_irqs, irq_desc,
+					  "irq_desc", NULL, 0);
+		else if (kernel_symbol_exists("nr_irqs"))
+			get_symbol_data("nr_irqs", sizeof(unsigned int),
+					&machdep->nr_irqs);
+
 		loongarch64_stackframe_init();
+
 		if (!machdep->hz)
 			machdep->hz = 250;
 		break;
-- 
2.39.2
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