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eeca7d7423
The Host1x driver will skip DMA API calls if the pin call for a buffer returns a physical address directly. This is not desirable even when the IOMMU is disabled, because then we don't get the cache flushing done by DMA API. As such, remove the direct path. This patch will be included as part of upstream v6 patch. Change-Id: I0a7806ae550e548bb567427c327a0d5890718a1e Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2488295 Reviewed-by: Jonathan Hunter <jonathanh@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> GVS: Gerrit_Virtual_Submit Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
82 lines
1.7 KiB
C
82 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2020 NVIDIA Corporation */
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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#include "gather_bo.h"
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static struct host1x_bo *gather_bo_get(struct host1x_bo *host_bo)
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{
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struct gather_bo *bo = container_of(host_bo, struct gather_bo, base);
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kref_get(&bo->ref);
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return host_bo;
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}
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static void gather_bo_release(struct kref *ref)
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{
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struct gather_bo *bo = container_of(ref, struct gather_bo, ref);
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kfree(bo->gather_data);
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kfree(bo);
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}
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void gather_bo_put(struct host1x_bo *host_bo)
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{
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struct gather_bo *bo = container_of(host_bo, struct gather_bo, base);
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kref_put(&bo->ref, gather_bo_release);
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}
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static struct sg_table *
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gather_bo_pin(struct device *dev, struct host1x_bo *host_bo, dma_addr_t *phys)
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{
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struct gather_bo *bo = container_of(host_bo, struct gather_bo, base);
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struct sg_table *sgt;
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int err;
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sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
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if (!sgt)
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return ERR_PTR(-ENOMEM);
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err = sg_alloc_table(sgt, 1, GFP_KERNEL);
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if (err) {
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kfree(sgt);
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return ERR_PTR(err);
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}
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sg_init_one(sgt->sgl, bo->gather_data, bo->gather_data_words*4);
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return sgt;
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}
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static void gather_bo_unpin(struct device *dev, struct sg_table *sgt)
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{
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if (sgt) {
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sg_free_table(sgt);
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kfree(sgt);
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}
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}
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static void *gather_bo_mmap(struct host1x_bo *host_bo)
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{
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struct gather_bo *bo = container_of(host_bo, struct gather_bo, base);
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return bo->gather_data;
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}
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static void gather_bo_munmap(struct host1x_bo *host_bo, void *addr)
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{
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}
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const struct host1x_bo_ops gather_bo_ops = {
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.get = gather_bo_get,
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.put = gather_bo_put,
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.pin = gather_bo_pin,
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.unpin = gather_bo_unpin,
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.mmap = gather_bo_mmap,
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.munmap = gather_bo_munmap,
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};
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