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3cc5d7a595
Add support for allocating buffers from reserved carveout memory when IOMMU is not available. This is useful during debugging or bring-up. In this configuration, the device uses physical addresses and does not support scatter-gather lists, requiring physically contiguous buffers. Implement carveout-backed allocation and integrate it into buffer management to support operation in physical address mode. Signed-off-by: Max Zhen <max.zhen@amd.com> Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org> Signed-off-by: Lizhi Hou <lizhi.hou@amd.com> Link: https://patch.msgid.link/20260427170949.2666601-1-lizhi.hou@amd.com
19 lines
606 B
C
19 lines
606 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2026, Advanced Micro Devices, Inc.
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*/
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#ifndef _AMDXDNA_CBUF_H_
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#define _AMDXDNA_CBUF_H_
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#include "amdxdna_pci_drv.h"
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#include <drm/drm_device.h>
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#include <linux/dma-buf.h>
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bool amdxdna_use_carveout(struct amdxdna_dev *xdna);
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int amdxdna_carveout_init(struct amdxdna_dev *xdna, u64 carveout_addr, u64 carveout_size);
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void amdxdna_carveout_fini(struct amdxdna_dev *xdna);
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void amdxdna_get_carveout_conf(struct amdxdna_dev *xdna, u64 *addr, u64 *size);
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struct dma_buf *amdxdna_get_cbuf(struct drm_device *dev, size_t size, u64 alignment);
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#endif
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