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Date: Wed, 17 Dec 2014 10:41:51 +0800
From: Jiang Liu <jiang.liu@...ux.intel.com>
To: Dimitri Sivanich <sivanich@....com>
CC: Bjorn Helgaas <bhelgaas@...gle.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>,
Randy Dunlap <rdunlap@...radead.org>,
Yinghai Lu <yinghai@...nel.org>,
Borislav Petkov <bp@...en8.de>, x86@...nel.org,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Tony Luck <tony.luck@...el.com>,
Joerg Roedel <joro@...tes.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
linux-acpi@...r.kernel.org, Russ Anderson <rja@....com>,
Nathan Zimmer <nzimmer@....com>
Subject: Re: [Patch Part2 v6 22/27] x86, uv: Use hierarchy irqdomain to manage
UV interrupts
On 2014/12/17 1:29, Dimitri Sivanich wrote:
> I answered my own question, this had never been tested on UV.
>
> The gru driver fails with:
> SGI GRU Device Driver: uv_setup_irq failed, errno=22
>
> The info->type in uv_domain_alloc() is not set to X86_IRQ_ALLOC_TYPE_UV
> (info->type is never set to that value anywhere).
>
> Adding the following to uv_setup_irq allows it to work:
>
> --- linux.orig/arch/x86/platform/uv/uv_irq.c
> +++ linux/arch/x86/platform/uv/uv_irq.c
> @@ -187,6 +187,7 @@ int uv_setup_irq(char *irq_name, int cpu
> return -ENOMEM;
>
> init_irq_alloc_info(&info, cpumask_of(cpu));
> + info.type = X86_IRQ_ALLOC_TYPE_UV;
> info.uv_limit = limit;
> info.uv_blade = mmr_blade;
> info.uv_offset = mmr_offset;
>
> On Mon, Dec 15, 2014 at 03:37:35PM -0600, Dimitri Sivanich wrote:
Hi Dimitri,
Thanks for reporting and fixing this bug. We will rebase the
tip/x86/apic branch and fold the above patch into the original patch.
May I assume a Tested-by from you? I have no UV systems for testing.
Regards!
Gerry
>> Was this patch ever tested on a UV system?
>>
>> Also, adding some SGI folks to the CC list, since there were none listed before.
>>
>> On Tue, Nov 25, 2014 at 01:53:31PM +0800, Jiang Liu wrote:
>>> Enhance UV code to support hierarchy irqdomain, it helps to make
>>> the architecture more clear.
>>>
>>> We should construct hwirq based on mmr_blade and mmr_offset, but
>>> mmr_offset is type of unsigned long, it may exceed the range of
>>> irq_hw_number_t. So help about the way to construct hwirq based
>>> on mmr_blade and mmr_offset is welcomed!
>>>
>>> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
>>> ---
>>> arch/x86/include/asm/hw_irq.h | 9 ++
>>> arch/x86/platform/uv/uv_irq.c | 287 ++++++++++++++++-------------------------
>>> 2 files changed, 117 insertions(+), 179 deletions(-)
>>>
>>> diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
>>> index 46dec7e37829..bbf90fe2a224 100644
>>> --- a/arch/x86/include/asm/hw_irq.h
>>> +++ b/arch/x86/include/asm/hw_irq.h
>>> @@ -123,6 +123,7 @@ enum irq_alloc_type {
>>> X86_IRQ_ALLOC_TYPE_MSI,
>>> X86_IRQ_ALLOC_TYPE_MSIX,
>>> X86_IRQ_ALLOC_TYPE_DMAR,
>>> + X86_IRQ_ALLOC_TYPE_UV,
>>> };
>>>
>>> struct irq_alloc_info {
>>> @@ -169,6 +170,14 @@ struct irq_alloc_info {
>>> void *ht_update;
>>> };
>>> #endif
>>> +#ifdef CONFIG_X86_UV
>>> + struct {
>>> + int uv_limit;
>>> + int uv_blade;
>>> + unsigned long uv_offset;
>>> + char *uv_name;
>>> + };
>>> +#endif
>>> };
>>> };
>>>
>>> diff --git a/arch/x86/platform/uv/uv_irq.c b/arch/x86/platform/uv/uv_irq.c
>>> index 474912d03f40..c237ed34a498 100644
>>> --- a/arch/x86/platform/uv/uv_irq.c
>>> +++ b/arch/x86/platform/uv/uv_irq.c
>>> @@ -19,17 +19,31 @@
>>> #include <asm/uv/uv_hub.h>
>>>
>>> /* MMR offset and pnode of hub sourcing interrupts for a given irq */
>>> -struct uv_irq_2_mmr_pnode{
>>> - struct rb_node list;
>>> +struct uv_irq_2_mmr_pnode {
>>> unsigned long offset;
>>> int pnode;
>>> - int irq;
>>> };
>>>
>>> -static DEFINE_SPINLOCK(uv_irq_lock);
>>> -static struct rb_root uv_irq_root;
>>> +static void uv_program_mmr(struct irq_cfg *cfg, struct uv_irq_2_mmr_pnode *info)
>>> +{
>>> + unsigned long mmr_value;
>>> + struct uv_IO_APIC_route_entry *entry;
>>> +
>>> + BUILD_BUG_ON(sizeof(struct uv_IO_APIC_route_entry) !=
>>> + sizeof(unsigned long));
>>> +
>>> + mmr_value = 0;
>>> + entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
>>> + entry->vector = cfg->vector;
>>> + entry->delivery_mode = apic->irq_delivery_mode;
>>> + entry->dest_mode = apic->irq_dest_mode;
>>> + entry->polarity = 0;
>>> + entry->trigger = 0;
>>> + entry->mask = 0;
>>> + entry->dest = cfg->dest_apicid;
>>>
>>> -static int uv_set_irq_affinity(struct irq_data *, const struct cpumask *, bool);
>>> + uv_write_global_mmr64(info->pnode, info->offset, mmr_value);
>>> +}
>>>
>>> static void uv_noop(struct irq_data *data) { }
>>>
>>> @@ -38,6 +52,24 @@ static void uv_ack_apic(struct irq_data *data)
>>> ack_APIC_irq();
>>> }
>>>
>>> +static int
>>> +uv_set_irq_affinity(struct irq_data *data, const struct cpumask *mask,
>>> + bool force)
>>> +{
>>> + struct irq_data *parent = data->parent_data;
>>> + struct irq_cfg *cfg = irqd_cfg(data);
>>> + int ret;
>>> +
>>> + ret = parent->chip->irq_set_affinity(parent, mask, force);
>>> + if (ret >= 0) {
>>> + uv_program_mmr(cfg, data->chip_data);
>>> + if (cfg->move_in_progress)
>>> + send_cleanup_vector(cfg);
>>> + }
>>> +
>>> + return ret;
>>> +}
>>> +
>>> static struct irq_chip uv_irq_chip = {
>>> .name = "UV-CORE",
>>> .irq_mask = uv_noop,
>>> @@ -46,179 +78,99 @@ static struct irq_chip uv_irq_chip = {
>>> .irq_set_affinity = uv_set_irq_affinity,
>>> };
>>>
>>> -/*
>>> - * Add offset and pnode information of the hub sourcing interrupts to the
>>> - * rb tree for a specific irq.
>>> - */
>>> -static int uv_set_irq_2_mmr_info(int irq, unsigned long offset, unsigned blade)
>>> +static int uv_domain_alloc(struct irq_domain *domain, unsigned int virq,
>>> + unsigned int nr_irqs, void *arg)
>>> {
>>> - struct rb_node **link = &uv_irq_root.rb_node;
>>> - struct rb_node *parent = NULL;
>>> - struct uv_irq_2_mmr_pnode *n;
>>> - struct uv_irq_2_mmr_pnode *e;
>>> - unsigned long irqflags;
>>> -
>>> - n = kmalloc_node(sizeof(struct uv_irq_2_mmr_pnode), GFP_KERNEL,
>>> - uv_blade_to_memory_nid(blade));
>>> - if (!n)
>>> + struct uv_irq_2_mmr_pnode *chip_data;
>>> + struct irq_alloc_info *info = arg;
>>> + struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
>>> + int ret;
>>> +
>>> + if (nr_irqs > 1 || !info || info->type != X86_IRQ_ALLOC_TYPE_UV)
>>> + return -EINVAL;
>>> +
>>> + chip_data = kmalloc_node(sizeof(*chip_data), GFP_KERNEL,
>>> + irq_data->node);
>>> + if (!chip_data)
>>> return -ENOMEM;
>>>
>>> - n->irq = irq;
>>> - n->offset = offset;
>>> - n->pnode = uv_blade_to_pnode(blade);
>>> - spin_lock_irqsave(&uv_irq_lock, irqflags);
>>> - /* Find the right place in the rbtree: */
>>> - while (*link) {
>>> - parent = *link;
>>> - e = rb_entry(parent, struct uv_irq_2_mmr_pnode, list);
>>> -
>>> - if (unlikely(irq == e->irq)) {
>>> - /* irq entry exists */
>>> - e->pnode = uv_blade_to_pnode(blade);
>>> - e->offset = offset;
>>> - spin_unlock_irqrestore(&uv_irq_lock, irqflags);
>>> - kfree(n);
>>> - return 0;
>>> - }
>>> -
>>> - if (irq < e->irq)
>>> - link = &(*link)->rb_left;
>>> + ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
>>> + if (ret >= 0) {
>>> + if (info->uv_limit == UV_AFFINITY_CPU)
>>> + irq_set_status_flags(virq, IRQ_NO_BALANCING);
>>> else
>>> - link = &(*link)->rb_right;
>>> + irq_set_status_flags(virq, IRQ_MOVE_PCNTXT);
>>> +
>>> + chip_data->pnode = uv_blade_to_pnode(info->uv_blade);
>>> + chip_data->offset = info->uv_offset;
>>> + irq_domain_set_info(domain, virq, virq, &uv_irq_chip, chip_data,
>>> + handle_percpu_irq, NULL, info->uv_name);
>>> + } else {
>>> + kfree(chip_data);
>>> }
>>>
>>> - /* Insert the node into the rbtree. */
>>> - rb_link_node(&n->list, parent, link);
>>> - rb_insert_color(&n->list, &uv_irq_root);
>>> -
>>> - spin_unlock_irqrestore(&uv_irq_lock, irqflags);
>>> - return 0;
>>> + return ret;
>>> }
>>>
>>> -/* Retrieve offset and pnode information from the rb tree for a specific irq */
>>> -int uv_irq_2_mmr_info(int irq, unsigned long *offset, int *pnode)
>>> +static void uv_domain_free(struct irq_domain *domain, unsigned int virq,
>>> + unsigned int nr_irqs)
>>> {
>>> - struct uv_irq_2_mmr_pnode *e;
>>> - struct rb_node *n;
>>> - unsigned long irqflags;
>>> -
>>> - spin_lock_irqsave(&uv_irq_lock, irqflags);
>>> - n = uv_irq_root.rb_node;
>>> - while (n) {
>>> - e = rb_entry(n, struct uv_irq_2_mmr_pnode, list);
>>> -
>>> - if (e->irq == irq) {
>>> - *offset = e->offset;
>>> - *pnode = e->pnode;
>>> - spin_unlock_irqrestore(&uv_irq_lock, irqflags);
>>> - return 0;
>>> - }
>>> -
>>> - if (irq < e->irq)
>>> - n = n->rb_left;
>>> - else
>>> - n = n->rb_right;
>>> - }
>>> - spin_unlock_irqrestore(&uv_irq_lock, irqflags);
>>> - return -1;
>>> + struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
>>> +
>>> + BUG_ON(nr_irqs != 1);
>>> + kfree(irq_data->chip_data);
>>> + irq_clear_status_flags(virq, IRQ_MOVE_PCNTXT);
>>> + irq_clear_status_flags(virq, IRQ_NO_BALANCING);
>>> + irq_domain_free_irqs_top(domain, virq, nr_irqs);
>>> }
>>>
>>> /*
>>> * Re-target the irq to the specified CPU and enable the specified MMR located
>>> * on the specified blade to allow the sending of MSIs to the specified CPU.
>>> */
>>> -static int
>>> -arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade,
>>> - unsigned long mmr_offset, int limit)
>>> +static void uv_domain_activate(struct irq_domain *domain,
>>> + struct irq_data *irq_data)
>>> {
>>> - struct irq_cfg *cfg = irq_cfg(irq);
>>> - unsigned long mmr_value;
>>> - struct uv_IO_APIC_route_entry *entry;
>>> - int mmr_pnode;
>>> -
>>> - BUILD_BUG_ON(sizeof(struct uv_IO_APIC_route_entry) !=
>>> - sizeof(unsigned long));
>>> -
>>> - if (limit == UV_AFFINITY_CPU)
>>> - irq_set_status_flags(irq, IRQ_NO_BALANCING);
>>> - else
>>> - irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
>>> -
>>> - irq_set_chip_and_handler_name(irq, &uv_irq_chip, handle_percpu_irq,
>>> - irq_name);
>>> -
>>> - mmr_value = 0;
>>> - entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
>>> - entry->vector = cfg->vector;
>>> - entry->delivery_mode = apic->irq_delivery_mode;
>>> - entry->dest_mode = apic->irq_dest_mode;
>>> - entry->polarity = 0;
>>> - entry->trigger = 0;
>>> - entry->mask = 0;
>>> - entry->dest = cfg->dest_apicid;
>>> -
>>> - mmr_pnode = uv_blade_to_pnode(mmr_blade);
>>> - uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value);
>>> -
>>> - if (cfg->move_in_progress)
>>> - send_cleanup_vector(cfg);
>>> -
>>> - return irq;
>>> + uv_program_mmr(irqd_cfg(irq_data), irq_data->chip_data);
>>> }
>>>
>>> /*
>>> * Disable the specified MMR located on the specified blade so that MSIs are
>>> * longer allowed to be sent.
>>> */
>>> -static void arch_disable_uv_irq(int mmr_pnode, unsigned long mmr_offset)
>>> +static void uv_domain_deactivate(struct irq_domain *domain,
>>> + struct irq_data *irq_data)
>>> {
>>> unsigned long mmr_value;
>>> struct uv_IO_APIC_route_entry *entry;
>>>
>>> - BUILD_BUG_ON(sizeof(struct uv_IO_APIC_route_entry) !=
>>> - sizeof(unsigned long));
>>> -
>>> mmr_value = 0;
>>> entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
>>> entry->mask = 1;
>>> -
>>> - uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value);
>>> + uv_program_mmr(irqd_cfg(irq_data), irq_data->chip_data);
>>> }
>>>
>>> -static int
>>> -uv_set_irq_affinity(struct irq_data *data, const struct cpumask *mask,
>>> - bool force)
>>> -{
>>> - struct irq_cfg *cfg = irqd_cfg(data);
>>> - unsigned int dest;
>>> - unsigned long mmr_value, mmr_offset;
>>> - struct uv_IO_APIC_route_entry *entry;
>>> - int mmr_pnode;
>>> -
>>> - if (apic_set_affinity(data, mask, &dest))
>>> - return -1;
>>> -
>>> - mmr_value = 0;
>>> - entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
>>> -
>>> - entry->vector = cfg->vector;
>>> - entry->delivery_mode = apic->irq_delivery_mode;
>>> - entry->dest_mode = apic->irq_dest_mode;
>>> - entry->polarity = 0;
>>> - entry->trigger = 0;
>>> - entry->mask = 0;
>>> - entry->dest = dest;
>>> -
>>> - /* Get previously stored MMR and pnode of hub sourcing interrupts */
>>> - if (uv_irq_2_mmr_info(data->irq, &mmr_offset, &mmr_pnode))
>>> - return -1;
>>> -
>>> - uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value);
>>> +static struct irq_domain_ops uv_domain_ops = {
>>> + .alloc = uv_domain_alloc,
>>> + .free = uv_domain_free,
>>> + .activate = uv_domain_activate,
>>> + .deactivate = uv_domain_deactivate,
>>> +};
>>>
>>> - if (cfg->move_in_progress)
>>> - send_cleanup_vector(cfg);
>>> +static struct irq_domain *uv_get_irq_domain(void)
>>> +{
>>> + static struct irq_domain *uv_domain;
>>> + static DEFINE_MUTEX(uv_lock);
>>> +
>>> + mutex_lock(&uv_lock);
>>> + if (uv_domain == NULL) {
>>> + uv_domain = irq_domain_add_tree(NULL, &uv_domain_ops, NULL);
>>> + if (uv_domain)
>>> + uv_domain->parent = x86_vector_domain;
>>> + }
>>> + mutex_unlock(&uv_lock);
>>>
>>> - return IRQ_SET_MASK_OK_NOCOPY;
>>> + return uv_domain;
>>> }
>>>
>>> /*
>>> @@ -229,23 +181,20 @@ uv_set_irq_affinity(struct irq_data *data, const struct cpumask *mask,
>>> int uv_setup_irq(char *irq_name, int cpu, int mmr_blade,
>>> unsigned long mmr_offset, int limit)
>>> {
>>> - int ret, irq;
>>> struct irq_alloc_info info;
>>> + struct irq_domain *domain = uv_get_irq_domain();
>>> +
>>> + if (!domain)
>>> + return -ENOMEM;
>>>
>>> init_irq_alloc_info(&info, cpumask_of(cpu));
>>> - irq = irq_domain_alloc_irqs(NULL, 1, uv_blade_to_memory_nid(mmr_blade),
>>> - &info);
>>> - if (irq <= 0)
>>> - return -EBUSY;
>>> -
>>> - ret = arch_enable_uv_irq(irq_name, irq, cpu, mmr_blade, mmr_offset,
>>> - limit);
>>> - if (ret == irq)
>>> - uv_set_irq_2_mmr_info(irq, mmr_offset, mmr_blade);
>>> - else
>>> - irq_domain_free_irqs(irq, 1);
>>> + info.uv_limit = limit;
>>> + info.uv_blade = mmr_blade;
>>> + info.uv_offset = mmr_offset;
>>> + info.uv_name = irq_name;
>>>
>>> - return ret;
>>> + return irq_domain_alloc_irqs(domain, 1,
>>> + uv_blade_to_memory_nid(mmr_blade), &info);
>>> }
>>> EXPORT_SYMBOL_GPL(uv_setup_irq);
>>>
>>> @@ -258,26 +207,6 @@ EXPORT_SYMBOL_GPL(uv_setup_irq);
>>> */
>>> void uv_teardown_irq(unsigned int irq)
>>> {
>>> - struct uv_irq_2_mmr_pnode *e;
>>> - struct rb_node *n;
>>> - unsigned long irqflags;
>>> -
>>> - spin_lock_irqsave(&uv_irq_lock, irqflags);
>>> - n = uv_irq_root.rb_node;
>>> - while (n) {
>>> - e = rb_entry(n, struct uv_irq_2_mmr_pnode, list);
>>> - if (e->irq == irq) {
>>> - arch_disable_uv_irq(e->pnode, e->offset);
>>> - rb_erase(n, &uv_irq_root);
>>> - kfree(e);
>>> - break;
>>> - }
>>> - if (irq < e->irq)
>>> - n = n->rb_left;
>>> - else
>>> - n = n->rb_right;
>>> - }
>>> - spin_unlock_irqrestore(&uv_irq_lock, irqflags);
>>> irq_domain_free_irqs(irq, 1);
>>> }
>>> EXPORT_SYMBOL_GPL(uv_teardown_irq);
>>> --
>>> 1.7.10.4
>>>
>>> --
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