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a808878308
PCI subfunctions (SF) are anchored on the auxiliary bus. PCI physical and virtual functions are anchored on the PCI bus. The irq information of each such function is visible to users via sysfs directory "msi_irqs" containing files for each irq entry. However, for PCI SFs such information is unavailable. Due to this users have no visibility on IRQs used by the SFs. Secondly, an SF can be multi function device supporting rdma, netdevice and more. Without irq information at the bus level, the user is unable to view or use the affinity of the SF IRQs. Hence to match to the equivalent PCI PFs and VFs, add "irqs" directory, for supporting auxiliary devices, containing file for each irq entry. For example: $ ls /sys/bus/auxiliary/devices/mlx5_core.sf.1/irqs/ 50 51 52 53 54 55 56 57 58 Cc: Simon Horman <horms@kernel.org> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com> Reviewed-by: Parav Pandit <parav@nvidia.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Shay Drory <shayd@nvidia.com> Signed-off-by: Saeed Mahameed <saeedm@nvidia.com> --- v9-v10: - remove Przemek RB - add name field to auxiliary_irq_info (Greg and Przemek) - handle bogus IRQ in auxiliary_device_sysfs_irq_remove (Greg) v8-v9: - add Przemek RB - use guard() in auxiliary_irq_dir_prepare (Paolo) v7-v8: - use cleanup.h for info and name fields (Greg) - correct error flow in auxiliary_irq_dir_prepare (Przemek) - add documentation for new fields of auxiliary_device (Simon) v6-v7: - dynamically creating irqs directory when first irq file created (Greg) - removed irqs flag and simplified the dev_add() API (Greg) - move sysfs related new code to a new auxiliary_sysfs.c file (Greg) v5-v6: - removed concept of shared and exclusive and hence global xarray (Greg) v4-v5: - restore global mutex and replace refcount_t with simple integer (Greg) v3->4: - remove global mutex (Przemek) v2->v3: - fix function declaration in case SYSFS isn't defined v1->v2: - move #ifdefs from drivers/base/auxiliary.c to include/linux/auxiliary_bus.h (Greg) - use EXPORT_SYMBOL_GPL instead of EXPORT_SYMBOL (Greg) - Fix kzalloc(ref) to kzalloc(*ref) (Simon) - Add return description in auxiliary_device_sysfs_irq_add() kdoc (Simon) - Fix auxiliary_irq_mode_show doc (kernel test boot)
114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2024, NVIDIA CORPORATION & AFFILIATES
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*/
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#include <linux/auxiliary_bus.h>
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#include <linux/slab.h>
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#define AUXILIARY_MAX_IRQ_NAME 11
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struct auxiliary_irq_info {
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struct device_attribute sysfs_attr;
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char name[AUXILIARY_MAX_IRQ_NAME];
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};
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static struct attribute *auxiliary_irq_attrs[] = {
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NULL
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};
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static const struct attribute_group auxiliary_irqs_group = {
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.name = "irqs",
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.attrs = auxiliary_irq_attrs,
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};
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static int auxiliary_irq_dir_prepare(struct auxiliary_device *auxdev)
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{
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int ret = 0;
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guard(mutex)(&auxdev->sysfs.lock);
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if (auxdev->sysfs.irq_dir_exists)
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return 0;
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ret = devm_device_add_group(&auxdev->dev, &auxiliary_irqs_group);
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if (ret)
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return ret;
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auxdev->sysfs.irq_dir_exists = true;
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xa_init(&auxdev->sysfs.irqs);
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return 0;
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}
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/**
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* auxiliary_device_sysfs_irq_add - add a sysfs entry for the given IRQ
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* @auxdev: auxiliary bus device to add the sysfs entry.
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* @irq: The associated interrupt number.
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*
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* This function should be called after auxiliary device have successfully
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* received the irq.
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* The driver is responsible to add a unique irq for the auxiliary device. The
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* driver can invoke this function from multiple thread context safely for
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* unique irqs of the auxiliary devices. The driver must not invoke this API
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* multiple times if the irq is already added previously.
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*
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* Return: zero on success or an error code on failure.
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*/
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int auxiliary_device_sysfs_irq_add(struct auxiliary_device *auxdev, int irq)
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{
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struct auxiliary_irq_info *info __free(kfree) = NULL;
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struct device *dev = &auxdev->dev;
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int ret;
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ret = auxiliary_irq_dir_prepare(auxdev);
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if (ret)
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return ret;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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sysfs_attr_init(&info->sysfs_attr.attr);
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snprintf(info->name, AUXILIARY_MAX_IRQ_NAME, "%d", irq);
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ret = xa_insert(&auxdev->sysfs.irqs, irq, info, GFP_KERNEL);
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if (ret)
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return ret;
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info->sysfs_attr.attr.name = info->name;
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ret = sysfs_add_file_to_group(&dev->kobj, &info->sysfs_attr.attr,
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auxiliary_irqs_group.name);
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if (ret)
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goto sysfs_add_err;
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xa_store(&auxdev->sysfs.irqs, irq, no_free_ptr(info), GFP_KERNEL);
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return 0;
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sysfs_add_err:
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xa_erase(&auxdev->sysfs.irqs, irq);
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return ret;
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}
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EXPORT_SYMBOL_GPL(auxiliary_device_sysfs_irq_add);
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/**
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* auxiliary_device_sysfs_irq_remove - remove a sysfs entry for the given IRQ
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* @auxdev: auxiliary bus device to add the sysfs entry.
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* @irq: the IRQ to remove.
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*
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* This function should be called to remove an IRQ sysfs entry.
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* The driver must invoke this API when IRQ is released by the device.
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*/
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void auxiliary_device_sysfs_irq_remove(struct auxiliary_device *auxdev, int irq)
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{
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struct auxiliary_irq_info *info __free(kfree) = xa_load(&auxdev->sysfs.irqs, irq);
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struct device *dev = &auxdev->dev;
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if (!info) {
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dev_err(&auxdev->dev, "IRQ %d doesn't exist\n", irq);
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return;
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}
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sysfs_remove_file_from_group(&dev->kobj, &info->sysfs_attr.attr,
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auxiliary_irqs_group.name);
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xa_erase(&auxdev->sysfs.irqs, irq);
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}
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EXPORT_SYMBOL_GPL(auxiliary_device_sysfs_irq_remove);
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