2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License version 2 as
4 * published by the Free Software Foundation.
7 #ifdef CONFIG_ROCKCHIP_IOMMU_DEBUG
11 #include <linux/kernel.h>
12 #include <linux/hardirq.h>
13 #include <linux/slab.h>
14 #include <linux/scatterlist.h>
15 #include <linux/err.h>
18 #include <linux/of_platform.h>
22 #define IOMMU_REGION_GUARD (2<<PAGE_SHIFT)
24 static struct rk_vm_region *find_region(struct rk_iovmm *vmm, dma_addr_t iova)
26 struct rk_vm_region *region;
28 list_for_each_entry(region, &vmm->regions_list, node)
29 if (region->start == iova)
35 int rockchip_iovmm_invalidate_tlb(struct device *dev)
37 int ret = rockchip_iommu_tlb_invalidate_global(dev);
42 void rockchip_iovmm_set_fault_handler(struct device *dev,
43 rockchip_iommu_fault_handler_t handler)
45 struct iommu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
47 data->fault_handler = handler;
50 int rockchip_iovmm_activate(struct device *dev)
52 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
54 return iommu_attach_device(vmm->domain, dev);
57 void rockchip_iovmm_deactivate(struct device *dev)
59 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
61 iommu_detach_device(vmm->domain, dev);
64 dma_addr_t rockchip_iovmm_map(struct device *dev,
65 struct scatterlist *sg, off_t offset, size_t size)
68 dma_addr_t addr, start = 0;
69 size_t mapped_size = 0;
70 struct rk_vm_region *region;
71 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
75 for (; sg->length < offset; sg = sg_next(sg))
78 start_off = offset_in_page(sg_phys(sg) + offset);
79 size = PAGE_ALIGN(size + start_off);
81 order = __fls(min_t(size_t, size, SZ_1M));
83 region = kmalloc(sizeof(*region), GFP_KERNEL);
89 start = (dma_addr_t)gen_pool_alloc(vmm->vmm_pool,
90 size+IOMMU_REGION_GUARD);
96 pr_debug("%s: size = %zx\n", __func__, size);
106 /* if back to back sg entries are contiguous consolidate them */
107 while (sg_next(sg) && sg_phys(sg) + sg->length == sg_phys(sg_next(sg))) {
118 if (offset_in_page(phys)) {
119 len += offset_in_page(phys);
120 phys = round_down(phys, PAGE_SIZE);
123 len = PAGE_ALIGN(len);
125 if (len > (size - mapped_size))
126 len = size - mapped_size;
127 pr_debug("addr = %pad, phys = %pa, len = %zx\n", &addr, &phys, len);
128 ret = iommu_map(vmm->domain, addr, phys, len, 0);
134 } while ((sg = sg_next(sg)) && (mapped_size < size));
136 BUG_ON(mapped_size > size);
138 if (mapped_size < size)
141 region->start = start + start_off;
144 INIT_LIST_HEAD(®ion->node);
146 spin_lock(&vmm->lock);
148 list_add(®ion->node, &vmm->regions_list);
150 spin_unlock(&vmm->lock);
152 ret = rockchip_iommu_tlb_invalidate(dev);
154 spin_lock(&vmm->lock);
155 list_del(®ion->node);
156 spin_unlock(&vmm->lock);
159 dev_dbg(dev->archdata.iommu, "IOVMM: Allocated VM region @ %p/%#X bytes.\n",
160 ®ion->start, region->size);
162 return region->start;
165 iommu_unmap(vmm->domain, start, mapped_size);
166 gen_pool_free(vmm->vmm_pool, start, size);
170 dev_err(dev->archdata.iommu, "IOVMM: Failed to allocated VM region for %zx bytes.\n", size);
171 return (dma_addr_t)ret;
174 void rockchip_iovmm_unmap(struct device *dev, dma_addr_t iova)
176 struct rk_vm_region *region;
177 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
178 size_t unmapped_size;
180 /* This function must not be called in IRQ handlers */
183 spin_lock(&vmm->lock);
185 region = find_region(vmm, iova);
186 if (WARN_ON(!region)) {
187 spin_unlock(&vmm->lock);
191 list_del(®ion->node);
193 spin_unlock(&vmm->lock);
195 region->start = round_down(region->start, PAGE_SIZE);
197 unmapped_size = iommu_unmap(vmm->domain,
198 region->start, region->size);
200 rockchip_iommu_tlb_invalidate(dev);
202 gen_pool_free(vmm->vmm_pool, region->start,
203 region->size+IOMMU_REGION_GUARD);
205 WARN_ON(unmapped_size != region->size);
207 dev_dbg(dev->archdata.iommu, "IOVMM: Unmapped %zx bytes from %pad.\n",
208 unmapped_size, ®ion->start);
213 int rockchip_iovmm_map_oto(struct device *dev, phys_addr_t phys, size_t size)
215 struct rk_vm_region *region;
216 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
219 if (WARN_ON((phys + size) >= IOVA_START)) {
220 dev_err(dev->archdata.iommu, "Unable to create one to one mapping for %zx @ %pa\n",
225 region = kmalloc(sizeof(*region), GFP_KERNEL);
229 if (WARN_ON(phys & ~PAGE_MASK))
230 phys = round_down(phys, PAGE_SIZE);
233 ret = iommu_map(vmm->domain, (dma_addr_t)phys, phys, size, 0);
239 region->start = (dma_addr_t)phys;
241 INIT_LIST_HEAD(®ion->node);
243 spin_lock(&vmm->lock);
245 list_add(®ion->node, &vmm->regions_list);
247 spin_unlock(&vmm->lock);
249 ret = rockchip_iommu_tlb_invalidate(dev);
256 void rockchip_iovmm_unmap_oto(struct device *dev, phys_addr_t phys)
258 struct rk_vm_region *region;
259 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
260 size_t unmapped_size;
262 /* This function must not be called in IRQ handlers */
265 if (WARN_ON(phys & ~PAGE_MASK))
266 phys = round_down(phys, PAGE_SIZE);
268 spin_lock(&vmm->lock);
270 region = find_region(vmm, (dma_addr_t)phys);
271 if (WARN_ON(!region)) {
272 spin_unlock(&vmm->lock);
276 list_del(®ion->node);
278 spin_unlock(&vmm->lock);
280 unmapped_size = iommu_unmap(vmm->domain, region->start, region->size);
281 WARN_ON(unmapped_size != region->size);
282 dev_dbg(dev->archdata.iommu, "IOVMM: Unmapped %zx bytes from %pad.\n",
283 unmapped_size, ®ion->start);
288 int rockchip_init_iovmm(struct device *iommu, struct rk_iovmm *vmm)
292 vmm->vmm_pool = gen_pool_create(PAGE_SHIFT, -1);
293 if (!vmm->vmm_pool) {
295 goto err_setup_genalloc;
298 /* (1GB - 4KB) addr space from 0x10000000 */
299 ret = gen_pool_add(vmm->vmm_pool, IOVA_START, IOVM_SIZE, -1);
301 goto err_setup_domain;
303 vmm->domain = iommu_domain_alloc(&platform_bus_type);
306 goto err_setup_domain;
309 spin_lock_init(&vmm->lock);
311 INIT_LIST_HEAD(&vmm->regions_list);
313 dev_info(iommu, "IOVMM: Created %#x B IOVMM from %#x.\n",
314 IOVM_SIZE, IOVA_START);
317 gen_pool_destroy(vmm->vmm_pool);
319 dev_err(iommu, "IOVMM: Failed to create IOVMM (%d)\n", ret);