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Date: Sun, 17 Jul 2022 09:05:14 +0800
From: Jianmin Lv <lvjianmin@...ngson.cn>
To: Marc Zyngier <maz@...nel.org>,
Robert Moore <robert.moore@...el.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, 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 V15 01/15] ACPICA: MADT: Add LoongArch APICs support
On 2022/7/17 上午2:10, Marc Zyngier wrote:
> [+ Robert Moore]
>
> On Fri, 15 Jul 2022 08:05:37 +0100,
> Jianmin Lv <lvjianmin@...ngson.cn> wrote:
>>
>> From: Huacai Chen <chenhuacai@...ngson.cn>
>>
>> LoongArch-specific interrupt controllers (similar to APIC) are added
>> in the next revision of ACPI Specification (current revision is 6.4),
>> which including CORE_PIC (CPUINTC), LIO_PIC (LIOINTC), EIO_PIC (EIOINTC),
>> HT_PIC (HTVECINTC), BIO_PIC (PCHINTC), LPC_PIC (PCHLPC) and MSI_PIC
>> (PCHMSI). This patch add their definition.
>>
>> ACPI changes of LoongArch-specific interrupt controllers have already
>> been approved in the ECRs, and will be public in the next revision of
>> ACPI Specification.
>>
>> Reference: https://mantis.uefi.org/mantis/view.php?id=2203
>> Reference: https://mantis.uefi.org/mantis/view.php?id=2313
>>
>> Above links needs login(available for ASWG), so the following link(
>> the ECR file for adding LoongArch APICs into ACPI spec) is provided
>> for public:
>>
>> https://github.com/lvjianmin-loongson/acpica/blob/master/Add%20APIC%20Structures%20for%20Loongarch%20in%20MADT-rev3.pdf
>>
>> Signed-off-by: Jianmin Lv <lvjianmin@...ngson.cn>
>> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
>
> Since the ACPI maintainers are unwilling to take this patch (for
> undisclosed reasons), we need something to unblock this sorry
> situation, as I don't think it is fair on the LoongArch folks to be
> blocked for another cycle on this ground only.
>
> I'm proposing to replace this patch with the following, which will
> allow the patches to be merged without breaking anything. Once the
> ACPI support is updated, we'll be able to simply revert this patch.
>
> Thanks,
>
> M.
>
Ok, Marc, thanks very much really, I'll add the patch in the patch series.
> From 43ec25d2dbde3c422cce430c9d5ec32fbe7b255c Mon Sep 17 00:00:00 2001
> From: Marc Zyngier <maz@...nel.org>
> Date: Sat, 16 Jul 2022 18:56:10 +0100
> Subject: [PATCH] LoongArch: Provisionally add ACPICA data structures
>
> The LoongArch architecture is using ACPI, but the spec containing
> the required updates still is in an unreleased state.
>
> Instead of preventing the inclusion of the IRQ support into the
> kernel, add the missing bits to the arch-specific parts of
> the ACPICA support.
>
> Once the ACPICA bits are updated to the version that supports
> LoongArch, these bits can eventually be removed.
>
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> ---
> arch/loongarch/include/asm/acpi.h | 138 ++++++++++++++++++++++++++++++
> 1 file changed, 138 insertions(+)
>
> diff --git a/arch/loongarch/include/asm/acpi.h b/arch/loongarch/include/asm/acpi.h
> index 62044cd5b7bc..6155e46098af 100644
> --- a/arch/loongarch/include/asm/acpi.h
> +++ b/arch/loongarch/include/asm/acpi.h
> @@ -31,6 +31,144 @@ static inline bool acpi_has_cpu_in_madt(void)
>
> extern struct list_head acpi_wakeup_device_list;
>
> +/*
> + * Temporary definitions until the core ACPICA code gets updated (see
> + * 1656837932-18257-1-git-send-email-lvjianmin@...ngson.cn and its
> + * follow-ups for the "rationale").
> + *
> + * Once the "legal reasons" are cleared and that the code is merged,
> + * this can be dropped entierely.
> + */
> +#if (ACPI_CA_VERSION == 0x20220331 && !defined(LOONGARCH_ACPICA_EXT))
> +
> +#define LOONGARCH_ACPICA_EXT 1
> +
> +#define ACPI_MADT_TYPE_CORE_PIC 17
> +#define ACPI_MADT_TYPE_LIO_PIC 18
> +#define ACPI_MADT_TYPE_HT_PIC 19
> +#define ACPI_MADT_TYPE_EIO_PIC 20
> +#define ACPI_MADT_TYPE_MSI_PIC 21
> +#define ACPI_MADT_TYPE_BIO_PIC 22
> +#define ACPI_MADT_TYPE_LPC_PIC 23
> +
> +/* Values for Version field above */
> +
> +enum acpi_madt_core_pic_version {
> + ACPI_MADT_CORE_PIC_VERSION_NONE = 0,
> + ACPI_MADT_CORE_PIC_VERSION_V1 = 1,
> + ACPI_MADT_CORE_PIC_VERSION_RESERVED = 2 /* 2 and greater are reserved */
> +};
> +
> +enum acpi_madt_lio_pic_version {
> + ACPI_MADT_LIO_PIC_VERSION_NONE = 0,
> + ACPI_MADT_LIO_PIC_VERSION_V1 = 1,
> + ACPI_MADT_LIO_PIC_VERSION_RESERVED = 2 /* 2 and greater are reserved */
> +};
> +
> +enum acpi_madt_eio_pic_version {
> + ACPI_MADT_EIO_PIC_VERSION_NONE = 0,
> + ACPI_MADT_EIO_PIC_VERSION_V1 = 1,
> + ACPI_MADT_EIO_PIC_VERSION_RESERVED = 2 /* 2 and greater are reserved */
> +};
> +
> +enum acpi_madt_ht_pic_version {
> + ACPI_MADT_HT_PIC_VERSION_NONE = 0,
> + ACPI_MADT_HT_PIC_VERSION_V1 = 1,
> + ACPI_MADT_HT_PIC_VERSION_RESERVED = 2 /* 2 and greater are reserved */
> +};
> +
> +enum acpi_madt_bio_pic_version {
> + ACPI_MADT_BIO_PIC_VERSION_NONE = 0,
> + ACPI_MADT_BIO_PIC_VERSION_V1 = 1,
> + ACPI_MADT_BIO_PIC_VERSION_RESERVED = 2 /* 2 and greater are reserved */
> +};
> +
> +enum acpi_madt_msi_pic_version {
> + ACPI_MADT_MSI_PIC_VERSION_NONE = 0,
> + ACPI_MADT_MSI_PIC_VERSION_V1 = 1,
> + ACPI_MADT_MSI_PIC_VERSION_RESERVED = 2 /* 2 and greater are reserved */
> +};
> +
> +enum acpi_madt_lpc_pic_version {
> + ACPI_MADT_LPC_PIC_VERSION_NONE = 0,
> + ACPI_MADT_LPC_PIC_VERSION_V1 = 1,
> + ACPI_MADT_LPC_PIC_VERSION_RESERVED = 2 /* 2 and greater are reserved */
> +};
> +
> +/* Core Interrupt Controller */
> +
> +struct acpi_madt_core_pic {
> + struct acpi_subtable_header header;
> + u8 version;
> + u32 processor_id;
> + u32 core_id;
> + u32 flags;
> +};
> +
> +/* Legacy I/O Interrupt Controller */
> +
> +struct acpi_madt_lio_pic {
> + struct acpi_subtable_header header;
> + u8 version;
> + u64 address;
> + u16 size;
> + u8 cascade[2];
> + u32 cascade_map[2];
> +};
> +
> +/* Extend I/O Interrupt Controller */
> +
> +struct acpi_madt_eio_pic {
> + struct acpi_subtable_header header;
> + u8 version;
> + u8 cascade;
> + u8 node;
> + u64 node_map;
> +};
> +
> +/* HT Interrupt Controller */
> +
> +struct acpi_madt_ht_pic {
> + struct acpi_subtable_header header;
> + u8 version;
> + u64 address;
> + u16 size;
> + u8 cascade[8];
> +};
> +
> +/* Bridge I/O Interrupt Controller */
> +
> +struct acpi_madt_bio_pic {
> + struct acpi_subtable_header header;
> + u8 version;
> + u64 address;
> + u16 size;
> + u16 id;
> + u16 gsi_base;
> +};
> +
> +/* MSI Interrupt Controller */
> +
> +struct acpi_madt_msi_pic {
> + struct acpi_subtable_header header;
> + u8 version;
> + u64 msg_address;
> + u32 start;
> + u32 count;
> +};
> +
> +/* LPC Interrupt Controller */
> +
> +struct acpi_madt_lpc_pic {
> + struct acpi_subtable_header header;
> + u8 version;
> + u64 address;
> + u16 size;
> + u8 cascade;
> +};
> +
> +#endif
> +
> #endif /* !CONFIG_ACPI */
>
> #define ACPI_TABLE_UPGRADE_MAX_PHYS ARCH_LOW_ADDRESS_LIMIT
>
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