linux-kernel - Re: [PATCH V16 11/14] LoongArch: prepare to support multiple pch-pic and pch-msi irqdomain

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Date:   Tue, 19 Jul 2022 21:41:09 +0800
From:   Jianmin Lv <lvjianmin@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, loongarch@...ts.linux.dev,
        Hanjun Guo <guohanjun@...wei.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Huacai Chen <chenhuacai@...ngson.cn>
Subject: Re: [PATCH V16 11/14] LoongArch: prepare to support multiple pch-pic
 and pch-msi irqdomain



On 2022/7/19 上午10:38, Huacai Chen wrote:
> Hi, Jianmin,
> 
> Please change "prepare" to "Prepare" in the title, and move this patch
> just after "LoongArch: Use ACPI_GENERIC_GSI for gsi handling", since
> the former patches are all "preparation".
> 

Ok, thanks.


> Huacai
> 
> On Mon, Jul 18, 2022 at 10:21 PM Jianmin Lv <lvjianmin@...ngson.cn> wrote:
>>
>> For systems with two chipsets, there are two related pch-pic and
>> pch-msi irqdomains, each of which has the same node id as its
>> parent irqdomain. So we use a structure to mantain the relation
>> of node and it's parent irqdomain as pch irqdomin, the 'pci_segment'
>> field is only used to match the pci segment of a pci device when
>> setting msi irqdomain for the device.
>>
>> struct acpi_vector_group {
>>          int node;
>>          int pci_segment;
>>          struct irq_domain *parent;
>> };
>>
>> The field 'pci_segment' and 'node' are initialized from MCFG, and
>> the parent irqdomain driver will set field 'parent' by matching same
>> 'node'.
>>
>> Signed-off-by: Jianmin Lv <lvjianmin@...ngson.cn>
>> ---
>>   arch/loongarch/include/asm/irq.h |  8 ++++++++
>>   arch/loongarch/kernel/irq.c      | 38 ++++++++++++++++++++++++++++++++++++++
>>   2 files changed, 46 insertions(+)
>>
>> diff --git a/arch/loongarch/include/asm/irq.h b/arch/loongarch/include/asm/irq.h
>> index de8af43..c847300 100644
>> --- a/arch/loongarch/include/asm/irq.h
>> +++ b/arch/loongarch/include/asm/irq.h
>> @@ -48,6 +48,14 @@ static inline bool on_irq_stack(int cpu, unsigned long sp)
>>   #define MAX_IO_PICS 2
>>   #define NR_IRQS        (64 + (256 * MAX_IO_PICS))
>>
>> +struct acpi_vector_group {
>> +       int node;
>> +       int pci_segment;
>> +       struct irq_domain *parent;
>> +};
>> +extern struct acpi_vector_group pch_group[MAX_IO_PICS];
>> +extern struct acpi_vector_group msi_group[MAX_IO_PICS];
>> +
>>   #define CORES_PER_EIO_NODE     4
>>
>>   #define LOONGSON_CPU_UART0_VEC         10 /* CPU UART0 */
>> diff --git a/arch/loongarch/kernel/irq.c b/arch/loongarch/kernel/irq.c
>> index b04201c..06f2a15 100644
>> --- a/arch/loongarch/kernel/irq.c
>> +++ b/arch/loongarch/kernel/irq.c
>> @@ -26,6 +26,8 @@
>>   EXPORT_PER_CPU_SYMBOL(irq_stat);
>>
>>   struct irq_domain *cpu_domain;
>> +struct acpi_vector_group pch_group[MAX_IO_PICS];
>> +struct acpi_vector_group msi_group[MAX_IO_PICS];
>>
>>   /*
>>    * 'what should we do if we get a hw irq event on an illegal vector'.
>> @@ -52,6 +54,41 @@ int arch_show_interrupts(struct seq_file *p, int prec)
>>          return 0;
>>   }
>>
>> +static int __init early_pci_mcfg_parse(struct acpi_table_header *header)
>> +{
>> +       struct acpi_table_mcfg *mcfg;
>> +       struct acpi_mcfg_allocation *mptr;
>> +       int i, n;
>> +
>> +       if (header->length < sizeof(struct acpi_table_mcfg))
>> +               return -EINVAL;
>> +
>> +       n = (header->length - sizeof(struct acpi_table_mcfg)) /
>> +                                       sizeof(struct acpi_mcfg_allocation);
>> +       mcfg = (struct acpi_table_mcfg *)header;
>> +       mptr = (struct acpi_mcfg_allocation *) &mcfg[1];
>> +
>> +       for (i = 0; i < n; i++, mptr++) {
>> +               msi_group[i].pci_segment = mptr->pci_segment;
>> +               pch_group[i].node = msi_group[i].node = (mptr->address >> 44) & 0xf;
>> +       }
>> +
>> +       return 0;
>> +}
>> +
>> +static void __init init_vec_parent_group(void)
>> +{
>> +       int i;
>> +
>> +       for (i = 0; i < MAX_IO_PICS; i++) {
>> +               msi_group[i].pci_segment = -1;
>> +               msi_group[i].node = -1;
>> +               pch_group[i].node = -1;
>> +       }
>> +
>> +       acpi_table_parse(ACPI_SIG_MCFG, early_pci_mcfg_parse);
>> +}
>> +
>>   void __init init_IRQ(void)
>>   {
>>          int i;
>> @@ -65,6 +102,7 @@ void __init init_IRQ(void)
>>          clear_csr_ecfg(ECFG0_IM);
>>          clear_csr_estat(ESTATF_IP);
>>
>> +       init_vec_parent_group();
>>          irqchip_init();
>>   #ifdef CONFIG_SMP
>>          ipi_irq = EXCCODE_IPI - EXCCODE_INT_START;
>> --
>> 1.8.3.1
>>
>>