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)
46 int rockchip_iovmm_activate(struct device *dev)
48 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
50 return iommu_attach_device(vmm->domain, dev);
53 void rockchip_iovmm_deactivate(struct device *dev)
55 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
57 iommu_detach_device(vmm->domain, dev);
60 dma_addr_t rockchip_iovmm_map(struct device *dev,
61 struct scatterlist *sg, off_t offset, size_t size)
64 dma_addr_t addr, start = 0;
65 size_t mapped_size = 0;
66 struct rk_vm_region *region;
67 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
71 for (; sg_dma_len(sg) < offset; sg = sg_next(sg))
72 offset -= sg_dma_len(sg);
74 start_off = offset_in_page(sg_phys(sg) + offset);
75 size = PAGE_ALIGN(size + start_off);
77 order = __fls(min_t(size_t, size, SZ_1M));
79 region = kmalloc(sizeof(*region), GFP_KERNEL);
85 start = (dma_addr_t)gen_pool_alloc(vmm->vmm_pool, size);
91 pr_debug("%s: size = %zx\n", __func__, size);
101 /* if back to back sg entries are contiguous consolidate them */
102 while (sg_next(sg) && sg_phys(sg) +
103 sg_dma_len(sg) == sg_phys(sg_next(sg))) {
104 len += sg_dma_len(sg_next(sg));
114 if (offset_in_page(phys)) {
115 len += offset_in_page(phys);
116 phys = round_down(phys, PAGE_SIZE);
119 len = PAGE_ALIGN(len);
121 if (len > (size - mapped_size))
122 len = size - mapped_size;
123 pr_debug("addr = %pad, phys = %pa, len = %zx\n", &addr, &phys, len);
124 ret = iommu_map(vmm->domain, addr, phys, len, 0);
130 } while ((sg = sg_next(sg)) && (mapped_size < size));
132 BUG_ON(mapped_size > size);
134 if (mapped_size < size)
137 region->start = start + start_off;
140 INIT_LIST_HEAD(®ion->node);
142 spin_lock(&vmm->lock);
144 list_add(®ion->node, &vmm->regions_list);
146 spin_unlock(&vmm->lock);
148 ret = rockchip_iommu_tlb_invalidate(dev);
150 spin_lock(&vmm->lock);
151 list_del(®ion->node);
152 spin_unlock(&vmm->lock);
155 dev_dbg(dev->archdata.iommu, "IOVMM: Allocated VM region @ %p/%#X bytes.\n",
156 ®ion->start, region->size);
158 return region->start;
161 iommu_unmap(vmm->domain, start, mapped_size);
162 gen_pool_free(vmm->vmm_pool, start, size);
166 dev_err(dev->archdata.iommu, "IOVMM: Failed to allocated VM region for %zx bytes.\n", size);
167 return (dma_addr_t)ret;
170 void rockchip_iovmm_unmap(struct device *dev, dma_addr_t iova)
172 struct rk_vm_region *region;
173 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
174 size_t unmapped_size;
176 /* This function must not be called in IRQ handlers */
179 spin_lock(&vmm->lock);
181 region = find_region(vmm, iova);
182 if (WARN_ON(!region)) {
183 spin_unlock(&vmm->lock);
187 list_del(®ion->node);
189 spin_unlock(&vmm->lock);
191 region->start = round_down(region->start, PAGE_SIZE);
193 unmapped_size = iommu_unmap(vmm->domain,
194 region->start, region->size);
196 rockchip_iommu_tlb_invalidate(dev);
198 gen_pool_free(vmm->vmm_pool, region->start, region->size);
200 WARN_ON(unmapped_size != region->size);
202 dev_dbg(dev->archdata.iommu, "IOVMM: Unmapped %zx bytes from %pad.\n",
203 unmapped_size, ®ion->start);
208 int rockchip_iovmm_map_oto(struct device *dev, phys_addr_t phys, size_t size)
210 struct rk_vm_region *region;
211 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
214 if (WARN_ON((phys + size) >= IOVA_START)) {
215 dev_err(dev->archdata.iommu, "Unable to create one to one mapping for %zx @ %pa\n",
220 region = kmalloc(sizeof(*region), GFP_KERNEL);
224 if (WARN_ON(phys & ~PAGE_MASK))
225 phys = round_down(phys, PAGE_SIZE);
228 ret = iommu_map(vmm->domain, (dma_addr_t)phys, phys, size, 0);
234 region->start = (dma_addr_t)phys;
236 INIT_LIST_HEAD(®ion->node);
238 spin_lock(&vmm->lock);
240 list_add(®ion->node, &vmm->regions_list);
242 spin_unlock(&vmm->lock);
244 ret = rockchip_iommu_tlb_invalidate(dev);
251 void rockchip_iovmm_unmap_oto(struct device *dev, phys_addr_t phys)
253 struct rk_vm_region *region;
254 struct rk_iovmm *vmm = rockchip_get_iovmm(dev);
255 size_t unmapped_size;
257 /* This function must not be called in IRQ handlers */
260 if (WARN_ON(phys & ~PAGE_MASK))
261 phys = round_down(phys, PAGE_SIZE);
263 spin_lock(&vmm->lock);
265 region = find_region(vmm, (dma_addr_t)phys);
266 if (WARN_ON(!region)) {
267 spin_unlock(&vmm->lock);
271 list_del(®ion->node);
273 spin_unlock(&vmm->lock);
275 unmapped_size = iommu_unmap(vmm->domain, region->start, region->size);
276 WARN_ON(unmapped_size != region->size);
277 dev_dbg(dev->archdata.iommu, "IOVMM: Unmapped %zx bytes from %pad.\n",
278 unmapped_size, ®ion->start);
283 int rockchip_init_iovmm(struct device *iommu, struct rk_iovmm *vmm)
287 vmm->vmm_pool = gen_pool_create(PAGE_SHIFT, -1);
288 if (!vmm->vmm_pool) {
290 goto err_setup_genalloc;
293 /* (1GB - 4KB) addr space from 0x10000000 */
294 ret = gen_pool_add(vmm->vmm_pool, IOVA_START, IOVM_SIZE, -1);
296 goto err_setup_domain;
298 vmm->domain = iommu_domain_alloc(&platform_bus_type);
301 goto err_setup_domain;
304 spin_lock_init(&vmm->lock);
306 INIT_LIST_HEAD(&vmm->regions_list);
308 dev_info(iommu, "IOVMM: Created %#x B IOVMM from %#x.\n",
309 IOVM_SIZE, IOVA_START);
312 gen_pool_destroy(vmm->vmm_pool);
314 dev_err(iommu, "IOVMM: Failed to create IOVMM (%d)\n", ret);