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When platform firmware is committed to publishing EFI_CONVENTIONAL_MEMORY in the memory map, but CXL fails to assemble the region, dax_hmem can attempt to attach a dax device to the memory range. Take advantage of the new ability to support multiple "hmem_platform" devices, and to enable regression testing of several scenarios: * CXL correctly assembles a region, check dax_hmem fails to attach dax * CXL fails to assemble a region, check dax_hmem successfully attaches dax * Check that loading the dax_cxl driver loads the dax_hmem driver * Attempt to race cxl_mock_mem async probe vs dax_hmem probe flushing. Check that both positive and negative cases. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Reviewed-by: Alison Schofield <alison.schofield@intel.com> Tested-by: Alison Schofield <alison.schofield@intel.com> Link: https://patch.msgid.link/20260327052821.440749-10-dan.j.williams@intel.com Signed-off-by: Dave Jiang <dave.jiang@intel.com>
48 lines
1003 B
C
48 lines
1003 B
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2026 Intel Corporation */
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#include <linux/moduleparam.h>
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#include <linux/workqueue.h>
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#include "../../../drivers/dax/bus.h"
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static bool hmem_test;
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static void hmem_test_work(struct work_struct *work)
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{
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}
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static void hmem_test_release(struct device *dev)
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{
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struct hmem_platform_device *hpdev =
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container_of(dev, typeof(*hpdev), pdev.dev);
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memset(hpdev, 0, sizeof(*hpdev));
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}
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static struct hmem_platform_device hmem_test_device = {
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.pdev = {
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.name = "hmem_platform",
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.id = 1,
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.dev = {
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.release = hmem_test_release,
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},
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},
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.work = __WORK_INITIALIZER(hmem_test_device.work, hmem_test_work),
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};
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int hmem_test_init(void)
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{
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if (!hmem_test)
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return 0;
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return platform_device_register(&hmem_test_device.pdev);
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}
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void hmem_test_exit(void)
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{
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if (hmem_test)
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platform_device_unregister(&hmem_test_device.pdev);
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}
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module_param(hmem_test, bool, 0444);
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MODULE_PARM_DESC(hmem_test, "Enable/disable the dax_hmem test platform device");
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