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 void rockchip_iovmm_set_fault_handler(struct device *dev,
34 rockchip_iommu_fault_handler_t handler)
39 int rockchip_iovmm_activate(struct device *dev)
41 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
43 return iommu_attach_device(vmm->domain, dev);
46 void rockchip_iovmm_deactivate(struct device *dev)
48 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
50 iommu_detach_device(vmm->domain, dev);
53 dma_addr_t rockchip_iovmm_map(struct device *dev,
54 struct scatterlist *sg, off_t offset, size_t size)
57 dma_addr_t addr, start = 0;
58 size_t mapped_size = 0;
59 struct rk_vm_region *region;
60 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
64 for (; sg_dma_len(sg) < offset; sg = sg_next(sg))
65 offset -= sg_dma_len(sg);
67 start_off = offset_in_page(sg_phys(sg) + offset);
68 size = PAGE_ALIGN(size + start_off);
70 order = __fls(min_t(size_t, size, SZ_1M));
72 region = kmalloc(sizeof(*region), GFP_KERNEL);
78 start = (dma_addr_t)gen_pool_alloc(vmm->vmm_pool, size);
92 /* if back to back sg entries are contiguous consolidate them */
93 while (sg_next(sg) && sg_phys(sg) +
94 sg_dma_len(sg) == sg_phys(sg_next(sg))) {
95 len += sg_dma_len(sg_next(sg));
105 if (offset_in_page(phys)) {
106 len += offset_in_page(phys);
107 phys = round_down(phys, PAGE_SIZE);
110 len = PAGE_ALIGN(len);
112 if (len > (size - mapped_size))
113 len = size - mapped_size;
115 ret = iommu_map(vmm->domain, addr, phys, len, 0);
121 } while ((sg = sg_next(sg)) && (mapped_size < size));
123 BUG_ON(mapped_size > size);
125 if (mapped_size < size)
128 region->start = start + start_off;
131 INIT_LIST_HEAD(®ion->node);
133 spin_lock(&vmm->lock);
135 list_add(®ion->node, &vmm->regions_list);
137 spin_unlock(&vmm->lock);
139 ret = rockchip_iommu_tlb_invalidate(dev);
143 dev_dbg(dev->archdata.iommu, "IOVMM: Allocated VM region @ %#x/%#X bytes.\n",
144 region->start, region->size);
146 return region->start;
149 iommu_unmap(vmm->domain, start, mapped_size);
150 gen_pool_free(vmm->vmm_pool, start, size);
154 dev_err(dev->archdata.iommu, "IOVMM: Failed to allocated VM region for %#x bytes.\n", size);
155 return (dma_addr_t)ret;
158 void rockchip_iovmm_unmap(struct device *dev, dma_addr_t iova)
160 struct rk_vm_region *region;
161 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
162 size_t unmapped_size;
164 /* This function must not be called in IRQ handlers */
167 spin_lock(&vmm->lock);
169 region = find_region(vmm, iova);
170 if (WARN_ON(!region)) {
171 spin_unlock(&vmm->lock);
175 list_del(®ion->node);
177 spin_unlock(&vmm->lock);
179 region->start = round_down(region->start, PAGE_SIZE);
181 unmapped_size = iommu_unmap(vmm->domain,
182 region->start, region->size);
184 rockchip_iommu_tlb_invalidate(dev);
186 gen_pool_free(vmm->vmm_pool, region->start, region->size);
188 WARN_ON(unmapped_size != region->size);
190 dev_dbg(dev->archdata.iommu, "IOVMM: Unmapped %#x bytes from %#x.\n",
191 unmapped_size, region->start);
196 int rockchip_iovmm_map_oto(struct device *dev, phys_addr_t phys, size_t size)
198 struct rk_vm_region *region;
199 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
202 if (WARN_ON((phys + size) >= IOVA_START)) {
203 dev_err(dev->archdata.iommu, "Unable to create one to one mapping for %#x @ %#x\n",
208 region = kmalloc(sizeof(*region), GFP_KERNEL);
212 if (WARN_ON(phys & ~PAGE_MASK))
213 phys = round_down(phys, PAGE_SIZE);
216 ret = iommu_map(vmm->domain, (dma_addr_t)phys, phys, size, 0);
222 region->start = (dma_addr_t)phys;
224 INIT_LIST_HEAD(®ion->node);
226 spin_lock(&vmm->lock);
228 list_add(®ion->node, &vmm->regions_list);
230 spin_unlock(&vmm->lock);
232 ret = rockchip_iommu_tlb_invalidate(dev);
239 void rockchip_iovmm_unmap_oto(struct device *dev, phys_addr_t phys)
241 struct rk_vm_region *region;
242 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
243 size_t unmapped_size;
245 /* This function must not be called in IRQ handlers */
248 if (WARN_ON(phys & ~PAGE_MASK))
249 phys = round_down(phys, PAGE_SIZE);
251 spin_lock(&vmm->lock);
253 region = find_region(vmm, (dma_addr_t)phys);
254 if (WARN_ON(!region)) {
255 spin_unlock(&vmm->lock);
259 list_del(®ion->node);
261 spin_unlock(&vmm->lock);
263 unmapped_size = iommu_unmap(vmm->domain, region->start, region->size);
264 WARN_ON(unmapped_size != region->size);
265 dev_dbg(dev->archdata.iommu, "IOVMM: Unmapped %#x bytes from %#x.\n",
266 unmapped_size, region->start);
271 int rockchip_init_iovmm(struct device *iommu, struct rk_iovmm *vmm)
275 vmm->vmm_pool = gen_pool_create(PAGE_SHIFT, -1);
276 if (!vmm->vmm_pool) {
278 goto err_setup_genalloc;
281 /* (1GB - 4KB) addr space from 0x10000000 */
282 ret = gen_pool_add(vmm->vmm_pool, IOVA_START, IOVM_SIZE, -1);
284 goto err_setup_domain;
286 vmm->domain = iommu_domain_alloc(&platform_bus_type);
289 goto err_setup_domain;
292 spin_lock_init(&vmm->lock);
294 INIT_LIST_HEAD(&vmm->regions_list);
296 dev_info(iommu, "IOVMM: Created %#x B IOVMM from %#x.\n",
297 IOVM_SIZE, IOVA_START);
300 gen_pool_destroy(vmm->vmm_pool);
302 dev_err(iommu, "IOVMM: Failed to create IOVMM (%d)\n", ret);