From: Megha Dey <megha.dey@intel.com>
To: tglx@linutronix.de
Cc: linux-kernel@vger.kernel.org, dave.jiang@intel.com,
ashok.raj@intel.com, kevin.tian@intel.com, dwmw@amazon.co.uk,
x86@kernel.org, tony.luck@intel.com, dan.j.williams@intel.com,
megha.dey@intel.com, jgg@mellanox.com, kvm@vger.kernel.org,
iommu@lists.linux-foundation.org, alex.williamson@redhat.com,
bhelgaas@google.com, maz@kernel.org, linux-pci@vger.kernel.org,
baolu.lu@linux.intel.com, ravi.v.shankar@intel.com
Subject: [Patch V2 08/13] genirq: Set auxiliary data for an interrupt
Date: Fri, 26 Feb 2021 12:11:12 -0800 [thread overview]
Message-ID: <1614370277-23235-9-git-send-email-megha.dey@intel.com> (raw)
In-Reply-To: <1614370277-23235-1-git-send-email-megha.dey@intel.com>
Introduce a new function pointer in the irq_chip structure(irq_set_auxdata)
which is responsible for updating data which is stored in a shared register
or data storage. For example, the idxd driver uses the auxiliary data API
to enable/set and disable PASID field that is in the IMS entry (introduced
in a later patch) and that data are not typically present in MSI entry.
Reviewed-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Megha Dey <megha.dey@intel.com>
---
include/linux/interrupt.h | 2 ++
include/linux/irq.h | 4 ++++
kernel/irq/manage.c | 32 ++++++++++++++++++++++++++++++++
3 files changed, 38 insertions(+)
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 967e257..461ed1c 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -496,6 +496,8 @@ extern int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
extern int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
bool state);
+int irq_set_auxdata(unsigned int irq, unsigned int which, u64 val);
+
#ifdef CONFIG_IRQ_FORCED_THREADING
# ifdef CONFIG_PREEMPT_RT
# define force_irqthreads (true)
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 2efde6a..fc19f32 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -491,6 +491,8 @@ static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
* irq_request_resources
* @irq_compose_msi_msg: optional to compose message content for MSI
* @irq_write_msi_msg: optional to write message content for MSI
+ * @irq_set_auxdata: Optional function to update auxiliary data e.g. in
+ * shared registers
* @irq_get_irqchip_state: return the internal state of an interrupt
* @irq_set_irqchip_state: set the internal state of a interrupt
* @irq_set_vcpu_affinity: optional to target a vCPU in a virtual machine
@@ -538,6 +540,8 @@ struct irq_chip {
void (*irq_compose_msi_msg)(struct irq_data *data, struct msi_msg *msg);
void (*irq_write_msi_msg)(struct irq_data *data, struct msi_msg *msg);
+ int (*irq_set_auxdata)(struct irq_data *data, unsigned int which, u64 auxval);
+
int (*irq_get_irqchip_state)(struct irq_data *data, enum irqchip_irq_state which, bool *state);
int (*irq_set_irqchip_state)(struct irq_data *data, enum irqchip_irq_state which, bool state);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 85ede4e..68ff559 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -2860,3 +2860,35 @@ bool irq_check_status_bit(unsigned int irq, unsigned int bitmask)
return res;
}
EXPORT_SYMBOL_GPL(irq_check_status_bit);
+
+/**
+ * irq_set_auxdata - Set auxiliary data
+ * @irq: Interrupt to update
+ * @which: Selector which data to update
+ * @auxval: Auxiliary data value
+ *
+ * Function to update auxiliary data for an interrupt, e.g. to update data
+ * which is stored in a shared register or data storage (e.g. IMS).
+ */
+int irq_set_auxdata(unsigned int irq, unsigned int which, u64 val)
+{
+ struct irq_desc *desc;
+ struct irq_data *data;
+ unsigned long flags;
+ int res = -ENODEV;
+
+ desc = irq_get_desc_buslock(irq, &flags, 0);
+ if (!desc)
+ return -EINVAL;
+
+ for (data = &desc->irq_data; data; data = irqd_get_parent_data(data)) {
+ if (data->chip->irq_set_auxdata) {
+ res = data->chip->irq_set_auxdata(data, which, val);
+ break;
+ }
+ }
+
+ irq_put_desc_busunlock(desc, flags);
+ return res;
+}
+EXPORT_SYMBOL_GPL(irq_set_auxdata);
--
2.7.4
next prev parent reply other threads:[~2021-02-26 20:24 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-26 20:11 [Patch V2 00/13] Introduce dev-msi and interrupt message store Megha Dey
2021-02-26 20:11 ` [Patch V2 01/13] x86/irq: Add DEV_MSI allocation type Megha Dey
2021-02-26 20:11 ` [Patch V2 02/13] x86/msi: Rename and rework pci_msi_prepare() to cover non-PCI MSI Megha Dey
2021-02-26 20:11 ` [Patch V2 03/13] platform-msi: Provide default irq_chip:: Ack Megha Dey
2021-02-26 20:11 ` [Patch V2 04/13] genirq/proc: Take buslock on affinity write Megha Dey
2021-02-26 20:11 ` [Patch V2 05/13] genirq/msi: Provide and use msi_domain_set_default_info_flags() Megha Dey
2021-02-26 20:11 ` [Patch V2 06/13] platform-msi: Add device MSI infrastructure Megha Dey
2021-02-26 20:11 ` [Patch V2 07/13] irqdomain/msi: Provide msi_alloc/free_store() callbacks Megha Dey
2021-03-25 17:08 ` Marc Zyngier
2021-03-25 18:44 ` Thomas Gleixner
2021-03-26 10:14 ` Marc Zyngier
2021-02-26 20:11 ` Megha Dey [this message]
2021-03-25 17:23 ` [Patch V2 08/13] genirq: Set auxiliary data for an interrupt Marc Zyngier
2021-03-25 18:59 ` Thomas Gleixner
2021-03-26 10:32 ` Marc Zyngier
2021-03-26 15:09 ` Thomas Gleixner
2021-02-26 20:11 ` [Patch V2 09/13] iommu/vt-d: Add DEV-MSI support Megha Dey
2021-02-26 20:11 ` [Patch V2 10/13] iommu: Add capability IOMMU_CAP_VIOMMU_HINT Megha Dey
2021-02-26 20:11 ` [Patch V2 11/13] platform-msi: Add platform check for subdevice irq domain Megha Dey
2021-02-26 20:11 ` [Patch V2 12/13] irqchip: Add IMS (Interrupt Message Store) driver Megha Dey
2021-03-25 17:43 ` Marc Zyngier
2021-03-25 19:07 ` Thomas Gleixner
2021-03-26 1:03 ` Dey, Megha
2021-02-26 20:11 ` [Patch V2 13/13] genirq/msi: Provide helpers to return Linux IRQ/dev_msi hw IRQ number Megha Dey
2021-03-25 17:53 ` Marc Zyngier
2021-03-26 1:02 ` Dey, Megha
2021-03-26 12:58 ` Marc Zyngier
2021-03-30 1:57 ` Dey, Megha
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