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f8dc1bde18
dax_hmem (ab)uses a platform device to allow for a module to autoload in the presence of "Soft Reserved" resources. The dax_hmem driver had no dependencies on the "hmem_platform" device being a singleton until the recent "dax_hmem vs dax_cxl" takeover solution. Replace the layering violation of dax_hmem_work assuming that there will never be more than one "hmem_platform" device associated with a global work item with a dax_hmem local workqueue that can theoretically support any number of hmem_platform devices. Fixup the reference counting to only pin the device while it is live in the queue. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Alison Schofield <alison.schofield@intel.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Link: https://patch.msgid.link/20260327052821.440749-7-dan.j.williams@intel.com Signed-off-by: Dave Jiang <dave.jiang@intel.com>
77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
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#ifndef __DAX_BUS_H__
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#define __DAX_BUS_H__
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/range.h>
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#include <linux/workqueue.h>
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struct dev_dax;
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struct resource;
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struct dax_device;
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struct dax_region;
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/* dax bus specific ioresource flags */
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#define IORESOURCE_DAX_STATIC BIT(0)
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#define IORESOURCE_DAX_KMEM BIT(1)
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struct dax_region *alloc_dax_region(struct device *parent, int region_id,
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struct range *range, int target_node, unsigned int align,
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unsigned long flags);
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struct dev_dax_data {
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struct dax_region *dax_region;
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struct dev_pagemap *pgmap;
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resource_size_t size;
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int id;
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bool memmap_on_memory;
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};
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struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data);
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enum dax_driver_type {
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DAXDRV_KMEM_TYPE,
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DAXDRV_DEVICE_TYPE,
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};
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struct dax_device_driver {
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struct device_driver drv;
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struct list_head ids;
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enum dax_driver_type type;
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int (*probe)(struct dev_dax *dev);
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void (*remove)(struct dev_dax *dev);
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};
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int __dax_driver_register(struct dax_device_driver *dax_drv,
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struct module *module, const char *mod_name);
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#define dax_driver_register(driver) \
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__dax_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
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void dax_driver_unregister(struct dax_device_driver *dax_drv);
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void kill_dev_dax(struct dev_dax *dev_dax);
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bool static_dev_dax(struct dev_dax *dev_dax);
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struct hmem_platform_device {
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struct platform_device pdev;
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struct work_struct work;
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bool did_probe;
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};
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static inline struct hmem_platform_device *
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to_hmem_platform_device(struct platform_device *pdev)
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{
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return container_of(pdev, struct hmem_platform_device, pdev);
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}
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#if IS_ENABLED(CONFIG_DEV_DAX_HMEM)
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void dax_hmem_flush_work(void);
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#else
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static inline void dax_hmem_flush_work(void) { }
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#endif
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#define MODULE_ALIAS_DAX_DEVICE(type) \
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MODULE_ALIAS("dax:t" __stringify(type) "*")
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#define DAX_DEVICE_MODALIAS_FMT "dax:t%d"
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#endif /* __DAX_BUS_H__ */
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