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authorMing Lei <ming.lei@redhat.com>2019-02-16 20:13:09 +0300
committerThomas Gleixner <tglx@linutronix.de>2019-02-18 13:21:28 +0300
commitc66d4bd110a1f8a68c1a88bfbf866eb50c6464b7 (patch)
tree772a8ffe770a1386abd0a5f541cc2b38f2f4c1cd /include/linux/interrupt.h
parent9cfef55bb57e7620c63087be18a76351628f8d0f (diff)
downloadlinux-c66d4bd110a1f8a68c1a88bfbf866eb50c6464b7.tar.xz
genirq/affinity: Add new callback for (re)calculating interrupt sets
The interrupt affinity spreading mechanism supports to spread out affinities for one or more interrupt sets. A interrupt set contains one or more interrupts. Each set is mapped to a specific functionality of a device, e.g. general I/O queues and read I/O queus of multiqueue block devices. The number of interrupts per set is defined by the driver. It depends on the total number of available interrupts for the device, which is determined by the PCI capabilites and the availability of underlying CPU resources, and the number of queues which the device provides and the driver wants to instantiate. The driver passes initial configuration for the interrupt allocation via a pointer to struct irq_affinity. Right now the allocation mechanism is complex as it requires to have a loop in the driver to determine the maximum number of interrupts which are provided by the PCI capabilities and the underlying CPU resources. This loop would have to be replicated in every driver which wants to utilize this mechanism. That's unwanted code duplication and error prone. In order to move this into generic facilities it is required to have a mechanism, which allows the recalculation of the interrupt sets and their size, in the core code. As the core code does not have any knowledge about the underlying device, a driver specific callback is required in struct irq_affinity, which can be invoked by the core code. The callback gets the number of available interupts as an argument, so the driver can calculate the corresponding number and size of interrupt sets. At the moment the struct irq_affinity pointer which is handed in from the driver and passed through to several core functions is marked 'const', but for the callback to be able to modify the data in the struct it's required to remove the 'const' qualifier. Add the optional callback to struct irq_affinity, which allows drivers to recalculate the number and size of interrupt sets and remove the 'const' qualifier. For simple invocations, which do not supply a callback, a default callback is installed, which just sets nr_sets to 1 and transfers the number of spreadable vectors to the set_size array at index 0. This is for now guarded by a check for nr_sets != 0 to keep the NVME driver working until it is converted to the callback mechanism. To make sure that the driver configuration is correct under all circumstances the callback is invoked even when there are no interrupts for queues left, i.e. the pre/post requirements already exhaust the numner of available interrupts. At the PCI layer irq_create_affinity_masks() has to be invoked even for the case where the legacy interrupt is used. That ensures that the callback is invoked and the device driver can adjust to that situation. [ tglx: Fixed the simple case (no sets required). Moved the sanity check for nr_sets after the invocation of the callback so it catches broken drivers. Fixed the kernel doc comments for struct irq_affinity and de-'This patch'-ed the changelog ] Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Bjorn Helgaas <helgaas@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: linux-block@vger.kernel.org Cc: Sagi Grimberg <sagi@grimberg.me> Cc: linux-nvme@lists.infradead.org Cc: linux-pci@vger.kernel.org Cc: Keith Busch <keith.busch@intel.com> Cc: Sumit Saxena <sumit.saxena@broadcom.com> Cc: Kashyap Desai <kashyap.desai@broadcom.com> Cc: Shivasharan Srikanteshwara <shivasharan.srikanteshwara@broadcom.com> Link: https://lkml.kernel.org/r/20190216172228.512444498@linutronix.de
Diffstat (limited to 'include/linux/interrupt.h')
-rw-r--r--include/linux/interrupt.h10
1 files changed, 8 insertions, 2 deletions
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 5afdfd5dc39b..dcdddf4fa76b 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -252,12 +252,18 @@ struct irq_affinity_notify {
* @nr_sets: The number of interrupt sets for which affinity
* spreading is required
* @set_size: Array holding the size of each interrupt set
+ * @calc_sets: Callback for calculating the number and size
+ * of interrupt sets
+ * @priv: Private data for usage by @calc_sets, usually a
+ * pointer to driver/device specific data.
*/
struct irq_affinity {
unsigned int pre_vectors;
unsigned int post_vectors;
unsigned int nr_sets;
unsigned int set_size[IRQ_AFFINITY_MAX_SETS];
+ void (*calc_sets)(struct irq_affinity *, unsigned int nvecs);
+ void *priv;
};
/**
@@ -317,7 +323,7 @@ extern int
irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
struct irq_affinity_desc *
-irq_create_affinity_masks(unsigned int nvec, const struct irq_affinity *affd);
+irq_create_affinity_masks(unsigned int nvec, struct irq_affinity *affd);
unsigned int irq_calc_affinity_vectors(unsigned int minvec, unsigned int maxvec,
const struct irq_affinity *affd);
@@ -354,7 +360,7 @@ irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
}
static inline struct irq_affinity_desc *
-irq_create_affinity_masks(unsigned int nvec, const struct irq_affinity *affd)
+irq_create_affinity_masks(unsigned int nvec, struct irq_affinity *affd)
{
return NULL;
}