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Date: Wed, 19 Oct 2022 18:03:22 +0800
From: Huacai Chen <chenhuacai@...il.com>
To: Marc Zyngier <maz@...nel.org>
Cc: Huacai Chen <chenhuacai@...ngson.cn>,
Thomas Gleixner <tglx@...utronix.de>,
linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>,
Jiaxun Yang <jiaxun.yang@...goat.com>,
Jianmin Lv <lvjianmin@...ngson.cn>
Subject: Re: [PATCH] irqchip/loongson-htvec: Add ACPI init support
Hi, Marc,
On Wed, Oct 19, 2022 at 3:47 PM Marc Zyngier <maz@...nel.org> wrote:
>
> On Mon, 17 Oct 2022 04:18:47 +0100,
> Huacai Chen <chenhuacai@...ngson.cn> wrote:
> >
> > HTVECINTC stands for "HyperTransport Interrupts" that described in
> > Section 14.3 of "Loongson 3A5000 Processor Reference Manual". For more
> > information please refer Documentation/loongarch/irq-chip-model.rst.
> >
> > Though the extended model is the recommended one, there are still some
> > legacy model machines. So we add ACPI init support for HTVECINTC.
> >
> > Co-developed-by: Jianmin Lv <lvjianmin@...ngson.cn>
> > Signed-off-by: Jianmin Lv <lvjianmin@...ngson.cn>
> > Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> > ---
> > arch/loongarch/include/asm/irq.h | 2 +-
> > drivers/irqchip/Kconfig | 1 +
> > drivers/irqchip/irq-loongson-htvec.c | 145 +++++++++++++++++++------
> > drivers/irqchip/irq-loongson-liointc.c | 21 +++-
> > 4 files changed, 133 insertions(+), 36 deletions(-)
> >
> > diff --git a/arch/loongarch/include/asm/irq.h b/arch/loongarch/include/asm/irq.h
> > index d06d4542b634..9d3d36e41afe 100644
> > --- a/arch/loongarch/include/asm/irq.h
> > +++ b/arch/loongarch/include/asm/irq.h
> > @@ -93,7 +93,7 @@ int liointc_acpi_init(struct irq_domain *parent,
> > int eiointc_acpi_init(struct irq_domain *parent,
> > struct acpi_madt_eio_pic *acpi_eiointc);
> >
> > -struct irq_domain *htvec_acpi_init(struct irq_domain *parent,
> > +int htvec_acpi_init(struct irq_domain *parent,
> > struct acpi_madt_ht_pic *acpi_htvec);
> > int pch_lpc_acpi_init(struct irq_domain *parent,
> > struct acpi_madt_lpc_pic *acpi_pchlpc);
> > diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> > index 7ef9f5e696d3..17396e6e42fc 100644
> > --- a/drivers/irqchip/Kconfig
> > +++ b/drivers/irqchip/Kconfig
> > @@ -576,6 +576,7 @@ config IRQ_LOONGARCH_CPU
> > select GENERIC_IRQ_CHIP
> > select IRQ_DOMAIN
> > select GENERIC_IRQ_EFFECTIVE_AFF_MASK
> > + select LOONGSON_HTVEC
> > select LOONGSON_LIOINTC
> > select LOONGSON_EIOINTC
> > select LOONGSON_PCH_PIC
> > diff --git a/drivers/irqchip/irq-loongson-htvec.c b/drivers/irqchip/irq-loongson-htvec.c
> > index 60a335d7e64e..1bb414ec6e78 100644
> > --- a/drivers/irqchip/irq-loongson-htvec.c
> > +++ b/drivers/irqchip/irq-loongson-htvec.c
> > @@ -20,7 +20,6 @@
> > /* Registers */
> > #define HTVEC_EN_OFF 0x20
> > #define HTVEC_MAX_PARENT_IRQ 8
> > -
> > #define VEC_COUNT_PER_REG 32
> > #define VEC_REG_IDX(irq_id) ((irq_id) / VEC_COUNT_PER_REG)
> > #define VEC_REG_BIT(irq_id) ((irq_id) % VEC_COUNT_PER_REG)
> > @@ -32,6 +31,8 @@ struct htvec {
> > raw_spinlock_t htvec_lock;
> > };
> >
> > +static struct htvec *htvec_priv;
> > +
> > static void htvec_irq_dispatch(struct irq_desc *desc)
> > {
> > int i;
> > @@ -155,64 +156,140 @@ static void htvec_reset(struct htvec *priv)
> > }
> > }
> >
> > -static int htvec_of_init(struct device_node *node,
> > - struct device_node *parent)
> > +static int htvec_init(phys_addr_t addr, unsigned long size,
> > + int num_parents, int parent_irq[], struct fwnode_handle *domain_handle)
> > {
> > + int i;
> > struct htvec *priv;
> > - int err, parent_irq[8], i;
> >
> > priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> > if (!priv)
> > return -ENOMEM;
> >
> > + priv->num_parents = num_parents;
> > + priv->base = ioremap(addr, size);
> > raw_spin_lock_init(&priv->htvec_lock);
> > - priv->base = of_iomap(node, 0);
> > - if (!priv->base) {
> > - err = -ENOMEM;
> > - goto free_priv;
> > - }
> > -
> > - /* Interrupt may come from any of the 8 interrupt lines */
> > - for (i = 0; i < HTVEC_MAX_PARENT_IRQ; i++) {
> > - parent_irq[i] = irq_of_parse_and_map(node, i);
> > - if (parent_irq[i] <= 0)
> > - break;
> > -
> > - priv->num_parents++;
> > - }
> > -
> > - if (!priv->num_parents) {
> > - pr_err("Failed to get parent irqs\n");
> > - err = -ENODEV;
> > - goto iounmap_base;
> > - }
> >
> > - priv->htvec_domain = irq_domain_create_linear(of_node_to_fwnode(node),
> > + /* Setup IRQ domain */
> > + priv->htvec_domain = irq_domain_create_linear(domain_handle,
> > (VEC_COUNT_PER_REG * priv->num_parents),
> > &htvec_domain_ops, priv);
> > if (!priv->htvec_domain) {
> > - pr_err("Failed to create IRQ domain\n");
> > - err = -ENOMEM;
> > - goto irq_dispose;
> > + pr_err("loongson-htvec: cannot add IRQ domain\n");
> > + goto iounmap_base;
> > }
> >
> > htvec_reset(priv);
> >
> > - for (i = 0; i < priv->num_parents; i++)
> > + for (i = 0; i < priv->num_parents; i++) {
> > irq_set_chained_handler_and_data(parent_irq[i],
> > htvec_irq_dispatch, priv);
> > + }
> > +
> > + htvec_priv = priv;
> >
> > return 0;
> >
> > -irq_dispose:
> > - for (; i > 0; i--)
> > - irq_dispose_mapping(parent_irq[i - 1]);
> > iounmap_base:
> > iounmap(priv->base);
> > -free_priv:
> > kfree(priv);
> >
> > - return err;
> > + return -EINVAL;
> > +}
> > +
> > +#ifdef CONFIG_OF
> > +
> > +static int htvec_of_init(struct device_node *node,
> > + struct device_node *parent)
> > +{
> > + int i, err;
> > + int parent_irq[8];
> > + int num_parents = 0;
> > + struct resource res;
> > +
> > + if (of_address_to_resource(node, 0, &res))
> > + return -EINVAL;
> > +
> > + /* Interrupt may come from any of the 8 interrupt lines */
> > + for (i = 0; i < HTVEC_MAX_PARENT_IRQ; i++) {
> > + parent_irq[i] = irq_of_parse_and_map(node, i);
> > + if (parent_irq[i] <= 0)
> > + break;
> > +
> > + num_parents++;
> > + }
> > +
> > + err = htvec_init(res.start, resource_size(&res),
> > + num_parents, parent_irq, of_node_to_fwnode(node));
> > + if (err < 0)
> > + return err;
> > +
> > + return 0;
> > }
> >
> > IRQCHIP_DECLARE(htvec, "loongson,htvec-1.0", htvec_of_init);
> > +
> > +#endif
> > +
> > +#ifdef CONFIG_ACPI
> > +static int __init
> > +pch_pic_parse_madt(union acpi_subtable_headers *header,
> > + const unsigned long end)
>
> Please write the function name and the return type on the same
> line. Long lines are just fine.
This style keeps the same as other loongson irqchips, if I change it,
then should I send another patch to restyle other drivers?
>
> > +{
> > + struct acpi_madt_bio_pic *pchpic_entry = (struct acpi_madt_bio_pic *)header;
> > +
> > + return pch_pic_acpi_init(htvec_priv->htvec_domain, pchpic_entry);
> > +}
> > +
> > +static int __init
> > +pch_msi_parse_madt(union acpi_subtable_headers *header,
> > + const unsigned long end)
> > +{
> > + struct acpi_madt_msi_pic *pchmsi_entry = (struct acpi_madt_msi_pic *)header;
> > +
> > + return pch_msi_acpi_init(htvec_priv->htvec_domain, pchmsi_entry);
> > +}
> > +
> > +static int __init acpi_cascade_irqdomain_init(void)
> > +{
> > + acpi_table_parse_madt(ACPI_MADT_TYPE_BIO_PIC,
> > + pch_pic_parse_madt, 0);
> > + acpi_table_parse_madt(ACPI_MADT_TYPE_MSI_PIC,
> > + pch_msi_parse_madt, 0);
>
> What if any of these fail? They have a return value for a reason.
Similar to above, this keeps the same as other loongson irqchips, if I
change it, then should I send another patch to adjust other drivers?
>
> > + return 0;
>
> There is only a single possible return value, which is never checked.
>
> > +}
> > +
> > +int __init htvec_acpi_init(struct irq_domain *parent,
> > + struct acpi_madt_ht_pic *acpi_htvec)
> > +{
> > + int i, ret;
> > + int num_parents, parent_irq[8];
> > + struct fwnode_handle *domain_handle;
> > +
> > + if (!acpi_htvec)
> > + return -EINVAL;
> > +
> > + num_parents = HTVEC_MAX_PARENT_IRQ;
> > +
> > + domain_handle = irq_domain_alloc_fwnode((phys_addr_t *)acpi_htvec);
>
> NAK. Enough. I already mopped the floor for you during the previous
> cycle, I'm not going to do it again. Please see 7e4fd7a1a6fd.
Sorry, this will be fixed in the next version.
Huacai
>
> > + if (!domain_handle) {
> > + pr_err("Unable to allocate domain handle\n");
> > + return -ENOMEM;
> > + }
> > +
> > + /* Interrupt may come from any of the 8 interrupt lines */
> > + for (i = 0; i < HTVEC_MAX_PARENT_IRQ; i++)
> > + parent_irq[i] = irq_create_mapping(parent, acpi_htvec->cascade[i]);
> > +
> > + ret = htvec_init(acpi_htvec->address, acpi_htvec->size,
> > + num_parents, parent_irq, domain_handle);
> > +
> > + if (ret == 0)
> > + acpi_cascade_irqdomain_init();
> > + else
> > + irq_domain_free_fwnode(domain_handle);
> > +
> > + return ret;
> > +}
> > +
> > +#endif
> > diff --git a/drivers/irqchip/irq-loongson-liointc.c b/drivers/irqchip/irq-loongson-liointc.c
> > index 0da8716f8f24..ddf23b1114cb 100644
> > --- a/drivers/irqchip/irq-loongson-liointc.c
> > +++ b/drivers/irqchip/irq-loongson-liointc.c
> > @@ -349,6 +349,22 @@ IRQCHIP_DECLARE(loongson_liointc_2_0, "loongson,liointc-2.0", liointc_of_init);
> > #endif
> >
> > #ifdef CONFIG_ACPI
> > +static int __init htintc_parse_madt(union acpi_subtable_headers *header,
> > + const unsigned long end)
> > +{
> > + struct acpi_madt_ht_pic *htintc_entry = (struct acpi_madt_ht_pic *)header;
> > + struct irq_domain *parent = irq_find_matching_fwnode(liointc_handle, DOMAIN_BUS_ANY);
> > +
> > + return htvec_acpi_init(parent, htintc_entry);
> > +}
> > +
> > +static int __init acpi_cascade_irqdomain_init(void)
> > +{
> > + acpi_table_parse_madt(ACPI_MADT_TYPE_HT_PIC,
> > + htintc_parse_madt, 0);
> > + return 0;
>
> Same comments as above.
>
> > +}
> > +
> > int __init liointc_acpi_init(struct irq_domain *parent, struct acpi_madt_lio_pic *acpi_liointc)
> > {
> > int ret;
> > @@ -365,9 +381,12 @@ int __init liointc_acpi_init(struct irq_domain *parent, struct acpi_madt_lio_pic
> > pr_err("Unable to allocate domain handle\n");
> > return -ENOMEM;
> > }
> > +
> > ret = liointc_init(acpi_liointc->address, acpi_liointc->size,
> > 1, domain_handle, NULL);
> > - if (ret)
> > + if (ret == 0)
> > + acpi_cascade_irqdomain_init();
> > + else
> > irq_domain_free_fwnode(domain_handle);
> >
> > return ret;
>
> M.
>
> --
> Without deviation from the norm, progress is not possible.
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