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1c6b4ceafc
Add a type2 accelerator mock driver for the platform device that simulates a CXL type2 device. The driver exercises the same minimal API calls that a real CXL type2 driver would utilize. Tested-by: Alison Schofield <alison.schofield@intel.com> Reviewed-by: Alison Schofield <alison.schofield@intel.com> Link: https://patch.msgid.link/20260629221104.3891733-8-dave.jiang@intel.com Signed-off-by: Dave Jiang <dave.jiang@intel.com>
67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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// Copyright(c) 2026 Intel Corporation. All rights reserved.
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#include <linux/platform_device.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/sizes.h>
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#include <cxl/mailbox.h>
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#include <cxlmem.h>
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struct mock_cxl_accel {
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struct cxl_dev_state cxlds;
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struct cxl_memdev *cxlmd;
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};
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static int cxl_mock_accel_probe(struct platform_device *pdev)
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{
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struct mock_cxl_accel *cxl_accel;
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struct device *dev = &pdev->dev;
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struct cxl_dev_state *cxlds;
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struct cxl_memdev *cxlmd;
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struct range mock_range;
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int rc;
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cxl_accel = devm_cxl_dev_state_create(&pdev->dev, CXL_DEVTYPE_DEVMEM,
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pdev->id + 1, 0,
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struct mock_cxl_accel, cxlds,
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false);
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if (!cxl_accel)
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return -ENOMEM;
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cxlds = &cxl_accel->cxlds;
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cxlds->media_ready = true;
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rc = cxl_set_capacity(cxlds, SZ_512M);
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if (rc)
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return rc;
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cxlmd = devm_cxl_probe_mem(cxlds, &mock_range);
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if (IS_ERR(cxlmd))
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return PTR_ERR(cxlmd);
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cxl_accel->cxlmd = cxlmd;
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dev_dbg(dev, "Probed mock accelerator with range %pra\n", &mock_range);
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return 0;
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}
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static const struct platform_device_id cxl_mock_accel_ids[] = {
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{ .name = "cxl_type2_accel" },
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{ }
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};
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MODULE_DEVICE_TABLE(platform, cxl_mock_accel_ids);
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static struct platform_driver cxl_mock_accel_driver = {
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.probe = cxl_mock_accel_probe,
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.id_table = cxl_mock_accel_ids,
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.driver = {
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.name = KBUILD_MODNAME,
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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},
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};
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module_platform_driver(cxl_mock_accel_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("cxl_test: accelerator device mock module");
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MODULE_IMPORT_NS("CXL");
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