Elliot Berman
47657548ae
Now that Gunyah modules can be probed without devicetree, there is no reason to bind/populate the gunyah-hypervisor node, even if it exists. Convert the probe function, which checked if we were running under Gunyah and tested for the info_area, into a regular initcall. core_initcall() used because Gunyah-aware protected guest needs to initialize early for virtio-balloon/free page reporting. Bug: 395833312 Change-Id: I7e2787d814c45d44d8868e249a512c66f90a725c Signed-off-by: Elliot Berman <elliot.berman@oss.qualcomm.com>
86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2023-2024 Qualcomm Innovation Center, Inc. All rights reserved.
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*/
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#define pr_fmt(fmt) "gunyah: " fmt
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#include <linux/gunyah.h>
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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struct gunyah_info_desc {
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__le16 id;
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__le16 owner;
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__le32 size;
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__le32 offset;
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#define INFO_DESC_VALID BIT(31)
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__le32 flags;
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};
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static void *info_area;
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void *gunyah_get_info(u16 owner, u16 id, size_t *size)
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{
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struct gunyah_info_desc *desc = info_area;
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__le16 le_owner = cpu_to_le16(owner);
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__le16 le_id = cpu_to_le16(id);
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if (!desc)
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return ERR_PTR(-ENOENT);
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for (desc = info_area; le32_to_cpu(desc->offset); desc++) {
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if (!(le32_to_cpu(desc->flags) & INFO_DESC_VALID))
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continue;
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mb();
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if (le_owner == desc->owner && le_id == desc->id) {
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if (size)
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*size = le32_to_cpu(desc->size);
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return info_area + le32_to_cpu(desc->offset);
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}
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}
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return ERR_PTR(-ENOENT);
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}
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EXPORT_SYMBOL_GPL(gunyah_get_info);
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static int __init gunyah_init(void)
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{
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struct gunyah_hypercall_hyp_identify_resp gunyah_api;
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unsigned long info_ipa, info_size;
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enum gunyah_error gh_error;
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if (!arch_is_gunyah_guest())
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return -ENODEV;
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gunyah_hypercall_hyp_identify(&gunyah_api);
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pr_info("Running under Gunyah hypervisor %llx/v%u\n",
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FIELD_GET(GUNYAH_API_INFO_VARIANT_MASK, gunyah_api.api_info),
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gunyah_api_version(&gunyah_api));
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/* Might move this out to individual drivers if there's ever an API version bump */
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if (gunyah_api_version(&gunyah_api) != GUNYAH_API_V1) {
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pr_info("Unsupported Gunyah version: %u\n",
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gunyah_api_version(&gunyah_api));
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return -ENODEV;
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}
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gh_error = gunyah_hypercall_addrspace_find_info_area(&info_ipa, &info_size);
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/* ignore errors for compatability with gh without info_area support */
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if (gh_error != GUNYAH_ERROR_OK)
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return 0;
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info_area = memremap(info_ipa, info_size, MEMREMAP_WB);
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if (!info_area) {
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pr_err("Failed to map addrspace info area\n");
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return -ENOMEM;
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}
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return 0;
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}
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core_initcall(gunyah_init);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Gunyah Driver");
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