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160 lines
3.4 KiB
160 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2021, NVIDIA Corporation. |
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*/ |
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#include <linux/device.h> |
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#include <linux/kref.h> |
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#include <linux/of.h> |
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#include <linux/of_platform.h> |
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#include <linux/pid.h> |
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#include <linux/slab.h> |
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#include "context.h" |
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#include "dev.h" |
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int host1x_memory_context_list_init(struct host1x *host1x) |
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{ |
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struct host1x_memory_context_list *cdl = &host1x->context_list; |
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struct device_node *node = host1x->dev->of_node; |
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struct host1x_memory_context *ctx; |
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unsigned int i; |
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int err; |
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cdl->devs = NULL; |
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cdl->len = 0; |
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mutex_init(&cdl->lock); |
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err = of_property_count_u32_elems(node, "iommu-map"); |
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if (err < 0) |
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return 0; |
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cdl->devs = kcalloc(err, sizeof(*cdl->devs), GFP_KERNEL); |
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if (!cdl->devs) |
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return -ENOMEM; |
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cdl->len = err / 4; |
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for (i = 0; i < cdl->len; i++) { |
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struct iommu_fwspec *fwspec; |
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ctx = &cdl->devs[i]; |
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ctx->host = host1x; |
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device_initialize(&ctx->dev); |
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/* |
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* Due to an issue with T194 NVENC, only 38 bits can be used. |
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* Anyway, 256GiB of IOVA ought to be enough for anyone. |
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*/ |
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ctx->dma_mask = DMA_BIT_MASK(38); |
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ctx->dev.dma_mask = &ctx->dma_mask; |
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ctx->dev.coherent_dma_mask = ctx->dma_mask; |
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dev_set_name(&ctx->dev, "host1x-ctx.%d", i); |
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ctx->dev.bus = &host1x_context_device_bus_type; |
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ctx->dev.parent = host1x->dev; |
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dma_set_max_seg_size(&ctx->dev, UINT_MAX); |
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err = device_add(&ctx->dev); |
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if (err) { |
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dev_err(host1x->dev, "could not add context device %d: %d\n", i, err); |
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goto del_devices; |
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} |
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err = of_dma_configure_id(&ctx->dev, node, true, &i); |
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if (err) { |
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dev_err(host1x->dev, "IOMMU configuration failed for context device %d: %d\n", |
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i, err); |
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device_del(&ctx->dev); |
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goto del_devices; |
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} |
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fwspec = dev_iommu_fwspec_get(&ctx->dev); |
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if (!fwspec || !device_iommu_mapped(&ctx->dev)) { |
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dev_err(host1x->dev, "Context device %d has no IOMMU!\n", i); |
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device_del(&ctx->dev); |
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goto del_devices; |
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} |
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ctx->stream_id = fwspec->ids[0] & 0xffff; |
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} |
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return 0; |
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del_devices: |
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while (i--) |
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device_del(&cdl->devs[i].dev); |
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kfree(cdl->devs); |
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cdl->len = 0; |
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return err; |
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} |
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void host1x_memory_context_list_free(struct host1x_memory_context_list *cdl) |
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{ |
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unsigned int i; |
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for (i = 0; i < cdl->len; i++) |
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device_del(&cdl->devs[i].dev); |
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kfree(cdl->devs); |
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cdl->len = 0; |
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} |
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struct host1x_memory_context *host1x_memory_context_alloc(struct host1x *host1x, |
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struct pid *pid) |
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{ |
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struct host1x_memory_context_list *cdl = &host1x->context_list; |
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struct host1x_memory_context *free = NULL; |
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int i; |
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if (!cdl->len) |
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return ERR_PTR(-EOPNOTSUPP); |
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mutex_lock(&cdl->lock); |
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for (i = 0; i < cdl->len; i++) { |
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struct host1x_memory_context *cd = &cdl->devs[i]; |
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if (cd->owner == pid) { |
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refcount_inc(&cd->ref); |
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mutex_unlock(&cdl->lock); |
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return cd; |
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} else if (!cd->owner && !free) { |
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free = cd; |
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} |
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} |
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if (!free) { |
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mutex_unlock(&cdl->lock); |
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return ERR_PTR(-EBUSY); |
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} |
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refcount_set(&free->ref, 1); |
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free->owner = get_pid(pid); |
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mutex_unlock(&cdl->lock); |
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return free; |
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} |
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EXPORT_SYMBOL_GPL(host1x_memory_context_alloc); |
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void host1x_memory_context_get(struct host1x_memory_context *cd) |
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{ |
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refcount_inc(&cd->ref); |
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} |
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EXPORT_SYMBOL_GPL(host1x_memory_context_get); |
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void host1x_memory_context_put(struct host1x_memory_context *cd) |
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{ |
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struct host1x_memory_context_list *cdl = &cd->host->context_list; |
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if (refcount_dec_and_mutex_lock(&cd->ref, &cdl->lock)) { |
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put_pid(cd->owner); |
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cd->owner = NULL; |
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mutex_unlock(&cdl->lock); |
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} |
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} |
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EXPORT_SYMBOL_GPL(host1x_memory_context_put);
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