Elliot Berman
f5683219a9
On Qualcomm platforms, there is a firmware entity which controls access to physical pages. In order to share memory with another VM, this entity needs to be informed that the guest VM should have access to the memory. Bug: 338347082 Link: https://lore.kernel.org/all/20240222-gunyah-v17-21-1e9da6763d38@quicinc.com/ Change-Id: If56960856b5e4f3ca906a6171d0f50aea978c57e Co-developed-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com> Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com> Signed-off-by: Elliot Berman <quic_eberman@quicinc.com> Signed-off-by: Elliot Berman <elliot.berman@oss.qualcomm.com>
118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
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*/
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#include <linux/device.h>
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#include <linux/gunyah.h>
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#include <linux/module.h>
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#include <linux/rwsem.h>
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#include "rsc_mgr.h"
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static const struct gunyah_rm_platform_ops *rm_platform_ops;
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static DECLARE_RWSEM(rm_platform_ops_lock);
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int gunyah_rm_platform_pre_mem_share(struct gunyah_rm *rm,
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struct gunyah_rm_mem_parcel *mem_parcel)
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{
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int ret = 0;
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down_read(&rm_platform_ops_lock);
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if (rm_platform_ops && rm_platform_ops->pre_mem_share)
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ret = rm_platform_ops->pre_mem_share(rm, mem_parcel);
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up_read(&rm_platform_ops_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(gunyah_rm_platform_pre_mem_share);
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int gunyah_rm_platform_post_mem_reclaim(struct gunyah_rm *rm,
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struct gunyah_rm_mem_parcel *mem_parcel)
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{
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int ret = 0;
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down_read(&rm_platform_ops_lock);
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if (rm_platform_ops && rm_platform_ops->post_mem_reclaim)
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ret = rm_platform_ops->post_mem_reclaim(rm, mem_parcel);
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up_read(&rm_platform_ops_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(gunyah_rm_platform_post_mem_reclaim);
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int gunyah_rm_platform_pre_demand_page(struct gunyah_rm *rm, u16 vmid,
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enum gunyah_pagetable_access access,
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struct folio *folio)
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{
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int ret = 0;
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down_read(&rm_platform_ops_lock);
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if (rm_platform_ops && rm_platform_ops->pre_demand_page)
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ret = rm_platform_ops->pre_demand_page(rm, vmid, access, folio);
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up_read(&rm_platform_ops_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(gunyah_rm_platform_pre_demand_page);
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int gunyah_rm_platform_reclaim_demand_page(struct gunyah_rm *rm, u16 vmid,
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enum gunyah_pagetable_access access,
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struct folio *folio)
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{
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int ret = 0;
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down_read(&rm_platform_ops_lock);
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if (rm_platform_ops && rm_platform_ops->pre_demand_page)
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ret = rm_platform_ops->release_demand_page(rm, vmid, access,
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folio);
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up_read(&rm_platform_ops_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(gunyah_rm_platform_reclaim_demand_page);
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int gunyah_rm_register_platform_ops(
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const struct gunyah_rm_platform_ops *platform_ops)
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{
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int ret = 0;
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down_write(&rm_platform_ops_lock);
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if (!rm_platform_ops)
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rm_platform_ops = platform_ops;
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else
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ret = -EEXIST;
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up_write(&rm_platform_ops_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(gunyah_rm_register_platform_ops);
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void gunyah_rm_unregister_platform_ops(
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const struct gunyah_rm_platform_ops *platform_ops)
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{
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down_write(&rm_platform_ops_lock);
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if (rm_platform_ops == platform_ops)
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rm_platform_ops = NULL;
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up_write(&rm_platform_ops_lock);
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}
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EXPORT_SYMBOL_GPL(gunyah_rm_unregister_platform_ops);
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static void _devm_gunyah_rm_unregister_platform_ops(void *data)
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{
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gunyah_rm_unregister_platform_ops(
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(const struct gunyah_rm_platform_ops *)data);
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}
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int devm_gunyah_rm_register_platform_ops(
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struct device *dev, const struct gunyah_rm_platform_ops *ops)
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{
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int ret;
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ret = gunyah_rm_register_platform_ops(ops);
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if (ret)
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return ret;
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return devm_add_action(dev, _devm_gunyah_rm_unregister_platform_ops,
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(void *)ops);
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}
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EXPORT_SYMBOL_GPL(devm_gunyah_rm_register_platform_ops);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Gunyah Platform Hooks");
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