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Message-ID: <545B5ED7.7090901@huawei.com>
Date: Thu, 6 Nov 2014 19:43:19 +0800
From: Yijing Wang <wangyijing@...wei.com>
To: Jiang Liu <jiang.liu@...ux.intel.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Randy Dunlap <rdunlap@...radead.org>,
Yinghai Lu <yinghai@...nel.org>,
Borislav Petkov <bp@...en8.de>,
Grant Likely <grant.likely@...aro.org>,
Marc Zyngier <marc.zyngier@....com>,
Yingjoe Chen <yingjoe.chen@...iatek.com>, <x86@...nel.org>,
Joerg Roedel <joro@...tes.org>,
Matthias Brugger <matthias.bgg@...il.com>
CC: Tony Luck <tony.luck@...el.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
<linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
<iommu@...ts.linux-foundation.org>, <linux-pci@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Patch Part2 v4 13/31] x86: irq_remapping: Introduce new interfaces
to support hierarchy irqdomain
> +
> +enum irq_alloc_type {
> + X86_IRQ_ALLOC_TYPE_IOAPIC = 1,
> + X86_IRQ_ALLOC_TYPE_HPET,
> + X86_IRQ_ALLOC_TYPE_MSI,
> + X86_IRQ_ALLOC_TYPE_MSIX,
> +};
Hi Gerry, why not to use X86_IRQ_ALLOC_TYPE_MSI to represent both MSI and MSI-X type?
There are some differences to process MSI and MSI-X in irq remapping domain ?
>
> +extern struct irq_domain *irq_remapping_get_ir_irq_domain(
> + struct irq_alloc_info *info);
> +extern struct irq_domain *irq_remapping_get_irq_domain(
> + struct irq_alloc_info *info);
The two functions are too similar, and both get irq_domain by irq_alloc_info, possible to merge them ?
> +extern void irq_remapping_print_chip(struct irq_data *data, struct seq_file *p);
> +
> +/*
> + * Create MSI/MSIx irqdomain for interrupt remapping device, use @parent as
> + * parent irqdomain.
> + */
> +static inline struct irq_domain *
> +arch_create_msi_irq_domain(struct irq_domain *parent)
> +{
> + return NULL;
> +}
> +
> +/* Get parent irqdomain for interrupt remapping irqdomain */
> +static inline struct irq_domain *arch_get_ir_parent_domain(void)
> +{
> + return x86_vector_domain;
> +}
> +
> #else /* CONFIG_IRQ_REMAP */
>
> static inline void setup_irq_remapping_ops(void) { }
> @@ -101,6 +126,20 @@ static inline bool setup_remapped_irq(int irq,
> {
> return false;
> }
> +
> +static inline struct irq_domain *
> +irq_remapping_get_ir_irq_domain(struct irq_alloc_info *info)
> +{
> + return NULL;
> +}
> +
> +static inline struct irq_domain *
> +irq_remapping_get_irq_domain(struct irq_alloc_info *info)
> +{
> + return NULL;
> +}
> +
> +#define irq_remapping_print_chip NULL
> #endif /* CONFIG_IRQ_REMAP */
>
> extern int dmar_alloc_hwirq(void);
> diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
> index 63886bafed9f..176ff4372b7d 100644
> --- a/drivers/iommu/irq_remapping.c
> +++ b/drivers/iommu/irq_remapping.c
> @@ -377,7 +377,7 @@ void panic_if_irq_remap(const char *msg)
> panic(msg);
> }
>
> -static void ir_ack_apic_edge(struct irq_data *data)
> +void ir_ack_apic_edge(struct irq_data *data)
> {
> ack_APIC_irq();
> }
> @@ -388,6 +388,19 @@ static void ir_ack_apic_level(struct irq_data *data)
> eoi_ioapic_irq(data->irq, irqd_cfg(data));
> }
>
> +void irq_remapping_print_chip(struct irq_data *data, struct seq_file *p)
> +{
> + /*
> + * Assume interrupt is remapped if the parent irqdomain isn't the
> + * vector domain, which is true for MSI, HPET and IOAPIC on x86
> + * platforms.
> + */
> + if (data->domain && data->domain->parent != arch_get_ir_parent_domain())
> + seq_printf(p, " IR-%s", data->chip->name);
> + else
> + seq_printf(p, " %s", data->chip->name);
> +}
> +
> static void ir_print_prefix(struct irq_data *data, struct seq_file *p)
> {
> seq_printf(p, " IR-%s", data->chip->name);
> @@ -409,3 +422,36 @@ bool setup_remapped_irq(int irq, struct irq_cfg *cfg, struct irq_chip *chip)
> irq_remap_modify_chip_defaults(chip);
> return true;
> }
> +
> +/**
> + * irq_remapping_get_ir_irq_domain - Get the irqdomain associated the IOMMU
> + * device serving @info
> + * @info: interrupt allocation information, used to find the IOMMU device
> + *
> + * It's used to get parent irqdomain for HPET and IOAPIC domains.
> + * Returns pointer to IRQ domain, or NULL on failure.
> + */
> +struct irq_domain *
> +irq_remapping_get_ir_irq_domain(struct irq_alloc_info *info)
> +{
> + if (!remap_ops || !remap_ops->get_ir_irq_domain)
> + return NULL;
> +
> + return remap_ops->get_ir_irq_domain(info);
> +}
> +
> +/**
> + * irq_remapping_get_irq_domain - Get the irqdomain serving the MSI interrupt
> + * @info: interrupt allocation information, used to find the IOMMU device
> + *
> + * It's used to get irqdomain for MSI/MSIx interrupt allocation.
> + * Returns pointer to IRQ domain, or NULL on failure.
> + */
> +struct irq_domain *
> +irq_remapping_get_irq_domain(struct irq_alloc_info *info)
> +{
> + if (!remap_ops || !remap_ops->get_irq_domain)
> + return NULL;
> +
> + return remap_ops->get_irq_domain(info);
> +}
> diff --git a/drivers/iommu/irq_remapping.h b/drivers/iommu/irq_remapping.h
> index fde250f86e60..8c159d6fac46 100644
> --- a/drivers/iommu/irq_remapping.h
> +++ b/drivers/iommu/irq_remapping.h
> @@ -30,6 +30,8 @@ struct irq_data;
> struct cpumask;
> struct pci_dev;
> struct msi_msg;
> +struct irq_domain;
> +struct irq_alloc_info;
>
> extern int disable_irq_remap;
> extern int irq_remap_broken;
> @@ -81,11 +83,19 @@ struct irq_remap_ops {
>
> /* Setup interrupt remapping for an HPET MSI */
> int (*alloc_hpet_msi)(unsigned int, unsigned int);
> +
> + /* Get the irqdomain associated the IOMMU device */
> + struct irq_domain *(*get_ir_irq_domain)(struct irq_alloc_info *);
> +
> + /* Get the MSI irqdomain associated with the IOMMU device */
> + struct irq_domain *(*get_irq_domain)(struct irq_alloc_info *);
> };
>
> extern struct irq_remap_ops intel_irq_remap_ops;
> extern struct irq_remap_ops amd_iommu_irq_ops;
>
> +extern void ir_ack_apic_edge(struct irq_data *data);
> +
> #else /* CONFIG_IRQ_REMAP */
>
> #define irq_remapping_enabled 0
>
--
Thanks!
Yijing
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