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);
84 pr_debug("%s: size = %zx\n", __func__, size);
94 /* if back to back sg entries are contiguous consolidate them */
95 while (sg_next(sg) && sg_phys(sg) +
96 sg_dma_len(sg) == sg_phys(sg_next(sg))) {
97 len += sg_dma_len(sg_next(sg));
107 if (offset_in_page(phys)) {
108 len += offset_in_page(phys);
109 phys = round_down(phys, PAGE_SIZE);
112 len = PAGE_ALIGN(len);
114 if (len > (size - mapped_size))
115 len = size - mapped_size;
116 pr_debug("addr = %pad, phys = %pa, len = %zx\n", &addr, &phys, len);
117 ret = iommu_map(vmm->domain, addr, phys, len, 0);
123 } while ((sg = sg_next(sg)) && (mapped_size < size));
125 BUG_ON(mapped_size > size);
127 if (mapped_size < size)
130 region->start = start + start_off;
133 INIT_LIST_HEAD(®ion->node);
135 spin_lock(&vmm->lock);
137 list_add(®ion->node, &vmm->regions_list);
139 spin_unlock(&vmm->lock);
141 ret = rockchip_iommu_tlb_invalidate(dev);
145 dev_dbg(dev->archdata.iommu, "IOVMM: Allocated VM region @ %pad%#zx bytes.\n",
146 ®ion->start, region->size);
148 return region->start;
151 iommu_unmap(vmm->domain, start, mapped_size);
152 gen_pool_free(vmm->vmm_pool, start, size);
156 dev_err(dev->archdata.iommu, "IOVMM: Failed to allocated VM region for %zx bytes.\n", size);
157 return (dma_addr_t)ret;
160 void rockchip_iovmm_unmap(struct device *dev, dma_addr_t iova)
162 struct rk_vm_region *region;
163 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
164 size_t unmapped_size;
166 /* This function must not be called in IRQ handlers */
169 spin_lock(&vmm->lock);
171 region = find_region(vmm, iova);
172 if (WARN_ON(!region)) {
173 spin_unlock(&vmm->lock);
177 list_del(®ion->node);
179 spin_unlock(&vmm->lock);
181 region->start = round_down(region->start, PAGE_SIZE);
183 unmapped_size = iommu_unmap(vmm->domain,
184 region->start, region->size);
186 rockchip_iommu_tlb_invalidate(dev);
188 gen_pool_free(vmm->vmm_pool, region->start, region->size);
190 WARN_ON(unmapped_size != region->size);
192 dev_dbg(dev->archdata.iommu, "IOVMM: Unmapped %zx bytes from %pad.\n",
193 unmapped_size, ®ion->start);
198 int rockchip_iovmm_map_oto(struct device *dev, phys_addr_t phys, size_t size)
200 struct rk_vm_region *region;
201 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
204 if (WARN_ON((phys + size) >= IOVA_START)) {
205 dev_err(dev->archdata.iommu, "Unable to create one to one mapping for %zx @ %pa\n",
210 region = kmalloc(sizeof(*region), GFP_KERNEL);
214 if (WARN_ON(phys & ~PAGE_MASK))
215 phys = round_down(phys, PAGE_SIZE);
218 ret = iommu_map(vmm->domain, (dma_addr_t)phys, phys, size, 0);
224 region->start = (dma_addr_t)phys;
226 INIT_LIST_HEAD(®ion->node);
228 spin_lock(&vmm->lock);
230 list_add(®ion->node, &vmm->regions_list);
232 spin_unlock(&vmm->lock);
234 ret = rockchip_iommu_tlb_invalidate(dev);
241 void rockchip_iovmm_unmap_oto(struct device *dev, phys_addr_t phys)
243 struct rk_vm_region *region;
244 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
245 size_t unmapped_size;
247 /* This function must not be called in IRQ handlers */
250 if (WARN_ON(phys & ~PAGE_MASK))
251 phys = round_down(phys, PAGE_SIZE);
253 spin_lock(&vmm->lock);
255 region = find_region(vmm, (dma_addr_t)phys);
256 if (WARN_ON(!region)) {
257 spin_unlock(&vmm->lock);
261 list_del(®ion->node);
263 spin_unlock(&vmm->lock);
265 unmapped_size = iommu_unmap(vmm->domain, region->start, region->size);
266 WARN_ON(unmapped_size != region->size);
267 dev_dbg(dev->archdata.iommu, "IOVMM: Unmapped %zx bytes from %pad.\n",
268 unmapped_size, ®ion->start);
273 int rockchip_init_iovmm(struct device *iommu, struct rk_iovmm *vmm)
277 vmm->vmm_pool = gen_pool_create(PAGE_SHIFT, -1);
278 if (!vmm->vmm_pool) {
280 goto err_setup_genalloc;
283 /* (1GB - 4KB) addr space from 0x10000000 */
284 ret = gen_pool_add(vmm->vmm_pool, IOVA_START, IOVM_SIZE, -1);
286 goto err_setup_domain;
288 vmm->domain = iommu_domain_alloc(&platform_bus_type);
291 goto err_setup_domain;
294 spin_lock_init(&vmm->lock);
296 INIT_LIST_HEAD(&vmm->regions_list);
298 dev_info(iommu, "IOVMM: Created %#x B IOVMM from %#x.\n",
299 IOVM_SIZE, IOVA_START);
302 gen_pool_destroy(vmm->vmm_pool);
304 dev_err(iommu, "IOVMM: Failed to create IOVMM (%d)\n", ret);