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f3bdbd4270
Setup RDMA admin queues using device command exposed over auxiliary device and manage these queues using ida. Co-developed-by: Andrew Boyer <andrew.boyer@amd.com> Signed-off-by: Andrew Boyer <andrew.boyer@amd.com> Co-developed-by: Allen Hubbe <allen.hubbe@amd.com> Signed-off-by: Allen Hubbe <allen.hubbe@amd.com> Signed-off-by: Abhijit Gangurde <abhijit.gangurde@amd.com> Link: https://patch.msgid.link/20250903061606.4139957-10-abhijit.gangurde@amd.com Signed-off-by: Leon Romanovsky <leon@kernel.org>
52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2018-2025, Advanced Micro Devices, Inc. */
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#include <linux/dma-mapping.h>
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#include "ionic_queue.h"
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int ionic_queue_init(struct ionic_queue *q, struct device *dma_dev,
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int depth, size_t stride)
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{
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if (depth < 0 || depth > 0xffff)
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return -EINVAL;
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if (stride == 0 || stride > 0x10000)
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return -EINVAL;
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if (depth == 0)
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depth = 1;
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q->depth_log2 = order_base_2(depth + 1);
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q->stride_log2 = order_base_2(stride);
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if (q->depth_log2 + q->stride_log2 < PAGE_SHIFT)
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q->depth_log2 = PAGE_SHIFT - q->stride_log2;
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if (q->depth_log2 > 16 || q->stride_log2 > 16)
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return -EINVAL;
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q->size = BIT_ULL(q->depth_log2 + q->stride_log2);
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q->mask = BIT(q->depth_log2) - 1;
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q->ptr = dma_alloc_coherent(dma_dev, q->size, &q->dma, GFP_KERNEL);
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if (!q->ptr)
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return -ENOMEM;
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/* it will always be page aligned, but just to be sure... */
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if (!PAGE_ALIGNED(q->ptr)) {
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dma_free_coherent(dma_dev, q->size, q->ptr, q->dma);
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return -ENOMEM;
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}
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q->prod = 0;
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q->cons = 0;
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q->dbell = 0;
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return 0;
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}
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void ionic_queue_destroy(struct ionic_queue *q, struct device *dma_dev)
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{
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dma_free_coherent(dma_dev, q->size, q->ptr, q->dma);
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}
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