1 // SPDX-License-Identifier: GPL-2.0-only
23 	struct host1x_memory_context_list *cdl = &host1x->context_list;  in host1x_memory_context_list_init()
24 	struct device_node *node = host1x->dev->of_node;  in host1x_memory_context_list_init()
25 	struct host1x_memory_context *ctx;  in host1x_memory_context_list_init()  local
29 	cdl->devs = NULL;  in host1x_memory_context_list_init()
30 	cdl->len = 0;  in host1x_memory_context_list_init()
31 	mutex_init(&cdl->lock);  in host1x_memory_context_list_init()
33 	err = of_property_count_u32_elems(node, "iommu-map");  in host1x_memory_context_list_init()
37 	cdl->len = err / 4;  in host1x_memory_context_list_init()
38 	cdl->devs = kcalloc(cdl->len, sizeof(*cdl->devs), GFP_KERNEL);  in host1x_memory_context_list_init()
39 	if (!cdl->devs)  in host1x_memory_context_list_init()
40 		return -ENOMEM;  in host1x_memory_context_list_init()
42 	for (i = 0; i < cdl->len; i++) {  in host1x_memory_context_list_init()
43 		ctx = &cdl->devs[i];  in host1x_memory_context_list_init()
45 		ctx->host = host1x;  in host1x_memory_context_list_init()
47 		device_initialize(&ctx->dev);  in host1x_memory_context_list_init()
53 		ctx->dma_mask = DMA_BIT_MASK(38);  in host1x_memory_context_list_init()
54 		ctx->dev.dma_mask = &ctx->dma_mask;  in host1x_memory_context_list_init()
55 		ctx->dev.coherent_dma_mask = ctx->dma_mask;  in host1x_memory_context_list_init()
56 		dev_set_name(&ctx->dev, "host1x-ctx.%d", i);  in host1x_memory_context_list_init()
57 		ctx->dev.bus = &host1x_context_device_bus_type;  in host1x_memory_context_list_init()
58 		ctx->dev.parent = host1x->dev;  in host1x_memory_context_list_init()
59 		ctx->dev.release = host1x_memory_context_release;  in host1x_memory_context_list_init()
61 		ctx->dev.dma_parms = &ctx->dma_parms;  in host1x_memory_context_list_init()
62 		dma_set_max_seg_size(&ctx->dev, UINT_MAX);  in host1x_memory_context_list_init()
64 		err = device_add(&ctx->dev);  in host1x_memory_context_list_init()
66 			dev_err(host1x->dev, "could not add context device %d: %d\n", i, err);  in host1x_memory_context_list_init()
67 			put_device(&ctx->dev);  in host1x_memory_context_list_init()
71 		err = of_dma_configure_id(&ctx->dev, node, true, &i);  in host1x_memory_context_list_init()
73 			dev_err(host1x->dev, "IOMMU configuration failed for context device %d: %d\n",  in host1x_memory_context_list_init()
75 			device_unregister(&ctx->dev);  in host1x_memory_context_list_init()
79 		if (!tegra_dev_iommu_get_stream_id(&ctx->dev, &ctx->stream_id) ||  in host1x_memory_context_list_init()
80 		    !device_iommu_mapped(&ctx->dev)) {  in host1x_memory_context_list_init()
81 			dev_err(host1x->dev, "Context device %d has no IOMMU!\n", i);  in host1x_memory_context_list_init()
82 			device_unregister(&ctx->dev);  in host1x_memory_context_list_init()
85 			 * This means that if IOMMU is disabled but context devices  in host1x_memory_context_list_init()
89 			err = -EINVAL;  in host1x_memory_context_list_init()
98 	while (i--)  in host1x_memory_context_list_init()
99 		device_unregister(&cdl->devs[i].dev);  in host1x_memory_context_list_init()
101 	kfree(cdl->devs);  in host1x_memory_context_list_init()
102 	cdl->devs = NULL;  in host1x_memory_context_list_init()
103 	cdl->len = 0;  in host1x_memory_context_list_init()
112 	for (i = 0; i < cdl->len; i++)  in host1x_memory_context_list_free()
113 		device_unregister(&cdl->devs[i].dev);  in host1x_memory_context_list_free()
115 	kfree(cdl->devs);  in host1x_memory_context_list_free()
116 	cdl->len = 0;  in host1x_memory_context_list_free()
123 	struct host1x_memory_context_list *cdl = &host1x->context_list;  in host1x_memory_context_alloc()
127 	if (!cdl->len)  in host1x_memory_context_alloc()
128 		return ERR_PTR(-EOPNOTSUPP);  in host1x_memory_context_alloc()
130 	mutex_lock(&cdl->lock);  in host1x_memory_context_alloc()
132 	for (i = 0; i < cdl->len; i++) {  in host1x_memory_context_alloc()
133 		struct host1x_memory_context *cd = &cdl->devs[i];  in host1x_memory_context_alloc()
135 		if (cd->dev.iommu->iommu_dev != dev->iommu->iommu_dev)  in host1x_memory_context_alloc()
138 		if (cd->owner == pid) {  in host1x_memory_context_alloc()
139 			refcount_inc(&cd->ref);  in host1x_memory_context_alloc()
140 			mutex_unlock(&cdl->lock);  in host1x_memory_context_alloc()
142 		} else if (!cd->owner && !free) {  in host1x_memory_context_alloc()
148 		mutex_unlock(&cdl->lock);  in host1x_memory_context_alloc()
149 		return ERR_PTR(-EBUSY);  in host1x_memory_context_alloc()
152 	refcount_set(&free->ref, 1);  in host1x_memory_context_alloc()
153 	free->owner = get_pid(pid);  in host1x_memory_context_alloc()
155 	mutex_unlock(&cdl->lock);  in host1x_memory_context_alloc()
163 	refcount_inc(&cd->ref);  in host1x_memory_context_get()
169 	struct host1x_memory_context_list *cdl = &cd->host->context_list;  in host1x_memory_context_put()
171 	if (refcount_dec_and_mutex_lock(&cd->ref, &cdl->lock)) {  in host1x_memory_context_put()
172 		put_pid(cd->owner);  in host1x_memory_context_put()
173 		cd->owner = NULL;  in host1x_memory_context_put()
174 		mutex_unlock(&cdl->lock);  in host1x_memory_context_put()