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>
20 #include "rockchip-iommu.h"
22 static struct rk_vm_region *find_region(struct rk_iovmm *vmm, dma_addr_t iova)
24 struct rk_vm_region *region;
26 list_for_each_entry(region, &vmm->regions_list, node)
27 if (region->start == iova)
33 int rockchip_iovmm_invalidate_tlb(struct device *dev)
35 int ret = rockchip_iommu_tlb_invalidate_global(dev);
40 void rockchip_iovmm_set_fault_handler(struct device *dev,
41 rockchip_iommu_fault_handler_t handler)
43 struct iommu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
45 data->fault_handler = handler;
48 int rockchip_iovmm_activate(struct device *dev)
50 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
52 return iommu_attach_device(vmm->domain, dev);
55 void rockchip_iovmm_deactivate(struct device *dev)
57 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
59 iommu_detach_device(vmm->domain, dev);
62 dma_addr_t rockchip_iovmm_map(struct device *dev,
63 struct scatterlist *sg, off_t offset, size_t size)
66 dma_addr_t addr, start = 0;
67 size_t mapped_size = 0;
68 struct rk_vm_region *region;
69 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
73 for (; sg_dma_len(sg) < offset; sg = sg_next(sg))
74 offset -= sg_dma_len(sg);
76 start_off = offset_in_page(sg_phys(sg) + offset);
77 size = PAGE_ALIGN(size + start_off);
79 order = __fls(min_t(size_t, size, SZ_1M));
81 region = kmalloc(sizeof(*region), GFP_KERNEL);
87 start = (dma_addr_t)gen_pool_alloc(vmm->vmm_pool, size);
93 pr_debug("%s: size = %zx\n", __func__, size);
101 len = sg_dma_len(sg);
103 /* if back to back sg entries are contiguous consolidate them */
104 while (sg_next(sg) && sg_phys(sg) +
105 sg_dma_len(sg) == sg_phys(sg_next(sg))) {
106 len += sg_dma_len(sg_next(sg));
116 if (offset_in_page(phys)) {
117 len += offset_in_page(phys);
118 phys = round_down(phys, PAGE_SIZE);
121 len = PAGE_ALIGN(len);
123 if (len > (size - mapped_size))
124 len = size - mapped_size;
125 pr_debug("addr = %pad, phys = %pa, len = %zx\n", &addr, &phys, len);
126 ret = iommu_map(vmm->domain, addr, phys, len, 0);
132 } while ((sg = sg_next(sg)) && (mapped_size < size));
134 BUG_ON(mapped_size > size);
136 if (mapped_size < size)
139 region->start = start + start_off;
142 INIT_LIST_HEAD(®ion->node);
144 spin_lock(&vmm->lock);
146 list_add(®ion->node, &vmm->regions_list);
148 spin_unlock(&vmm->lock);
150 ret = rockchip_iommu_tlb_invalidate(dev);
154 dev_dbg(dev->archdata.iommu, "IOVMM: Allocated VM region @ %p/%#X bytes.\n",
155 ®ion->start, region->size);
157 return region->start;
160 spin_lock(&vmm->lock);
161 list_del(®ion->node);
162 spin_unlock(&vmm->lock);
163 iommu_unmap(vmm->domain, start, mapped_size);
164 gen_pool_free(vmm->vmm_pool, start, size);
168 dev_err(dev->archdata.iommu, "IOVMM: Failed to allocated VM region for %zx bytes.\n", size);
169 return (dma_addr_t)ret;
172 void rockchip_iovmm_unmap(struct device *dev, dma_addr_t iova)
174 struct rk_vm_region *region;
175 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
176 size_t unmapped_size;
178 /* This function must not be called in IRQ handlers */
181 spin_lock(&vmm->lock);
183 region = find_region(vmm, iova);
184 if (WARN_ON(!region)) {
185 spin_unlock(&vmm->lock);
189 list_del(®ion->node);
191 spin_unlock(&vmm->lock);
193 region->start = round_down(region->start, PAGE_SIZE);
195 unmapped_size = iommu_unmap(vmm->domain,
196 region->start, region->size);
198 rockchip_iommu_tlb_invalidate(dev);
200 gen_pool_free(vmm->vmm_pool, region->start, region->size);
202 WARN_ON(unmapped_size != region->size);
204 dev_dbg(dev->archdata.iommu, "IOVMM: Unmapped %zx bytes from %pad.\n",
205 unmapped_size, ®ion->start);
210 int rockchip_iovmm_map_oto(struct device *dev, phys_addr_t phys, size_t size)
212 struct rk_vm_region *region;
213 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
216 if (WARN_ON((phys + size) >= IOVA_START)) {
217 dev_err(dev->archdata.iommu, "Unable to create one to one mapping for %zx @ %pa\n",
222 region = kmalloc(sizeof(*region), GFP_KERNEL);
226 if (WARN_ON(phys & ~PAGE_MASK))
227 phys = round_down(phys, PAGE_SIZE);
230 ret = iommu_map(vmm->domain, (dma_addr_t)phys, phys, size, 0);
236 region->start = (dma_addr_t)phys;
238 INIT_LIST_HEAD(®ion->node);
240 spin_lock(&vmm->lock);
242 list_add(®ion->node, &vmm->regions_list);
244 spin_unlock(&vmm->lock);
246 ret = rockchip_iommu_tlb_invalidate(dev);
253 void rockchip_iovmm_unmap_oto(struct device *dev, phys_addr_t phys)
255 struct rk_vm_region *region;
256 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
257 size_t unmapped_size;
259 /* This function must not be called in IRQ handlers */
262 if (WARN_ON(phys & ~PAGE_MASK))
263 phys = round_down(phys, PAGE_SIZE);
265 spin_lock(&vmm->lock);
267 region = find_region(vmm, (dma_addr_t)phys);
268 if (WARN_ON(!region)) {
269 spin_unlock(&vmm->lock);
273 list_del(®ion->node);
275 spin_unlock(&vmm->lock);
277 unmapped_size = iommu_unmap(vmm->domain, region->start, region->size);
278 WARN_ON(unmapped_size != region->size);
279 dev_dbg(dev->archdata.iommu, "IOVMM: Unmapped %zx bytes from %pad.\n",
280 unmapped_size, ®ion->start);
285 int rockchip_init_iovmm(struct device *iommu, struct rk_iovmm *vmm)
289 vmm->vmm_pool = gen_pool_create(PAGE_SHIFT, -1);
290 if (!vmm->vmm_pool) {
292 goto err_setup_genalloc;
295 /* (1GB - 4KB) addr space from 0x10000000 */
296 ret = gen_pool_add(vmm->vmm_pool, IOVA_START, IOVM_SIZE, -1);
298 goto err_setup_domain;
300 vmm->domain = iommu_domain_alloc(&platform_bus_type);
303 goto err_setup_domain;
306 spin_lock_init(&vmm->lock);
308 INIT_LIST_HEAD(&vmm->regions_list);
310 dev_info(iommu, "IOVMM: Created %#x B IOVMM from %#x.\n",
311 IOVM_SIZE, IOVA_START);
314 gen_pool_destroy(vmm->vmm_pool);
316 dev_err(iommu, "IOVMM: Failed to create IOVMM (%d)\n", ret);