1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2016-2018 Etnaviv Project
4 */
5
6#include <linux/bitops.h>
7#include <linux/dma-mapping.h>
8#include <linux/platform_device.h>
9#include <linux/sizes.h>
10#include <linux/slab.h>
11#include <linux/vmalloc.h>
12
13#include "etnaviv_cmdbuf.h"
14#include "etnaviv_gpu.h"
15#include "etnaviv_mmu.h"
16#include "state.xml.h"
17#include "state_hi.xml.h"
18
19#define MMUv2_PTE_PRESENT BIT(0)
20#define MMUv2_PTE_EXCEPTION BIT(1)
21#define MMUv2_PTE_WRITEABLE BIT(2)
22
23#define MMUv2_MTLB_MASK 0xffc00000
24#define MMUv2_MTLB_SHIFT 22
25#define MMUv2_STLB_MASK 0x003ff000
26#define MMUv2_STLB_SHIFT 12
27
28#define MMUv2_MAX_STLB_ENTRIES 1024
29
30struct etnaviv_iommuv2_context {
31 struct etnaviv_iommu_context base;
32 unsigned short id;
33 /* M(aster) TLB aka first level pagetable */
34 u32 *mtlb_cpu;
35 dma_addr_t mtlb_dma;
36 /* S(lave) TLB aka second level pagetable */
37 u32 *stlb_cpu[MMUv2_MAX_STLB_ENTRIES];
38 dma_addr_t stlb_dma[MMUv2_MAX_STLB_ENTRIES];
39};
40
41static struct etnaviv_iommuv2_context *
42to_v2_context(struct etnaviv_iommu_context *context)
43{
44 return container_of(context, struct etnaviv_iommuv2_context, base);
45}
46
47static void etnaviv_iommuv2_free(struct etnaviv_iommu_context *context)
48{
49 struct etnaviv_iommuv2_context *v2_context = to_v2_context(context);
50 int i;
51
52 drm_mm_takedown(mm: &context->mm);
53
54 for (i = 0; i < MMUv2_MAX_STLB_ENTRIES; i++) {
55 if (v2_context->stlb_cpu[i])
56 dma_free_wc(dev: context->global->dev, SZ_4K,
57 cpu_addr: v2_context->stlb_cpu[i],
58 dma_addr: v2_context->stlb_dma[i]);
59 }
60
61 dma_free_wc(dev: context->global->dev, SZ_4K, cpu_addr: v2_context->mtlb_cpu,
62 dma_addr: v2_context->mtlb_dma);
63
64 clear_bit(nr: v2_context->id, addr: context->global->v2.pta_alloc);
65
66 vfree(addr: v2_context);
67}
68static int
69etnaviv_iommuv2_ensure_stlb(struct etnaviv_iommuv2_context *v2_context,
70 int stlb)
71{
72 if (v2_context->stlb_cpu[stlb])
73 return 0;
74
75 v2_context->stlb_cpu[stlb] =
76 dma_alloc_wc(dev: v2_context->base.global->dev, SZ_4K,
77 dma_addr: &v2_context->stlb_dma[stlb],
78 GFP_KERNEL);
79
80 if (!v2_context->stlb_cpu[stlb])
81 return -ENOMEM;
82
83 memset32(s: v2_context->stlb_cpu[stlb], MMUv2_PTE_EXCEPTION,
84 SZ_4K / sizeof(u32));
85
86 v2_context->mtlb_cpu[stlb] =
87 v2_context->stlb_dma[stlb] | MMUv2_PTE_PRESENT;
88
89 return 0;
90}
91
92static int etnaviv_iommuv2_map(struct etnaviv_iommu_context *context,
93 unsigned long iova, phys_addr_t paddr,
94 size_t size, int prot)
95{
96 struct etnaviv_iommuv2_context *v2_context = to_v2_context(context);
97 int mtlb_entry, stlb_entry, ret;
98 u32 entry = lower_32_bits(paddr) | MMUv2_PTE_PRESENT;
99
100 if (size != SZ_4K)
101 return -EINVAL;
102
103 if (IS_ENABLED(CONFIG_PHYS_ADDR_T_64BIT))
104 entry |= (upper_32_bits(paddr) & 0xff) << 4;
105
106 if (prot & ETNAVIV_PROT_WRITE)
107 entry |= MMUv2_PTE_WRITEABLE;
108
109 mtlb_entry = (iova & MMUv2_MTLB_MASK) >> MMUv2_MTLB_SHIFT;
110 stlb_entry = (iova & MMUv2_STLB_MASK) >> MMUv2_STLB_SHIFT;
111
112 ret = etnaviv_iommuv2_ensure_stlb(v2_context, stlb: mtlb_entry);
113 if (ret)
114 return ret;
115
116 v2_context->stlb_cpu[mtlb_entry][stlb_entry] = entry;
117
118 return 0;
119}
120
121static size_t etnaviv_iommuv2_unmap(struct etnaviv_iommu_context *context,
122 unsigned long iova, size_t size)
123{
124 struct etnaviv_iommuv2_context *etnaviv_domain = to_v2_context(context);
125 int mtlb_entry, stlb_entry;
126
127 if (size != SZ_4K)
128 return -EINVAL;
129
130 mtlb_entry = (iova & MMUv2_MTLB_MASK) >> MMUv2_MTLB_SHIFT;
131 stlb_entry = (iova & MMUv2_STLB_MASK) >> MMUv2_STLB_SHIFT;
132
133 etnaviv_domain->stlb_cpu[mtlb_entry][stlb_entry] = MMUv2_PTE_EXCEPTION;
134
135 return SZ_4K;
136}
137
138static size_t etnaviv_iommuv2_dump_size(struct etnaviv_iommu_context *context)
139{
140 struct etnaviv_iommuv2_context *v2_context = to_v2_context(context);
141 size_t dump_size = SZ_4K;
142 int i;
143
144 for (i = 0; i < MMUv2_MAX_STLB_ENTRIES; i++)
145 if (v2_context->mtlb_cpu[i] & MMUv2_PTE_PRESENT)
146 dump_size += SZ_4K;
147
148 return dump_size;
149}
150
151static void etnaviv_iommuv2_dump(struct etnaviv_iommu_context *context, void *buf)
152{
153 struct etnaviv_iommuv2_context *v2_context = to_v2_context(context);
154 int i;
155
156 memcpy(buf, v2_context->mtlb_cpu, SZ_4K);
157 buf += SZ_4K;
158 for (i = 0; i < MMUv2_MAX_STLB_ENTRIES; i++)
159 if (v2_context->mtlb_cpu[i] & MMUv2_PTE_PRESENT) {
160 memcpy(buf, v2_context->stlb_cpu[i], SZ_4K);
161 buf += SZ_4K;
162 }
163}
164
165static void etnaviv_iommuv2_restore_nonsec(struct etnaviv_gpu *gpu,
166 struct etnaviv_iommu_context *context)
167{
168 struct etnaviv_iommuv2_context *v2_context = to_v2_context(context);
169 u16 prefetch;
170
171 /* If the MMU is already enabled the state is still there. */
172 if (gpu_read(gpu, VIVS_MMUv2_CONTROL) & VIVS_MMUv2_CONTROL_ENABLE)
173 return;
174
175 if (gpu->mmu_context)
176 etnaviv_iommu_context_put(ctx: gpu->mmu_context);
177 gpu->mmu_context = etnaviv_iommu_context_get(ctx: context);
178
179 prefetch = etnaviv_buffer_config_mmuv2(gpu,
180 mtlb_addr: (u32)v2_context->mtlb_dma,
181 safe_addr: (u32)context->global->bad_page_dma);
182 etnaviv_gpu_start_fe(gpu, address: (u32)etnaviv_cmdbuf_get_pa(buf: &gpu->buffer),
183 prefetch);
184 etnaviv_gpu_wait_idle(gpu, timeout_ms: 100);
185
186 gpu_write(gpu, VIVS_MMUv2_CONTROL, VIVS_MMUv2_CONTROL_ENABLE);
187}
188
189static void etnaviv_iommuv2_restore_sec(struct etnaviv_gpu *gpu,
190 struct etnaviv_iommu_context *context)
191{
192 struct etnaviv_iommuv2_context *v2_context = to_v2_context(context);
193 u16 prefetch;
194
195 /* If the MMU is already enabled the state is still there. */
196 if (gpu_read(gpu, VIVS_MMUv2_SEC_CONTROL) & VIVS_MMUv2_SEC_CONTROL_ENABLE)
197 return;
198
199 if (gpu->mmu_context)
200 etnaviv_iommu_context_put(ctx: gpu->mmu_context);
201 gpu->mmu_context = etnaviv_iommu_context_get(ctx: context);
202
203 gpu_write(gpu, VIVS_MMUv2_PTA_ADDRESS_LOW,
204 lower_32_bits(context->global->v2.pta_dma));
205 gpu_write(gpu, VIVS_MMUv2_PTA_ADDRESS_HIGH,
206 upper_32_bits(context->global->v2.pta_dma));
207 gpu_write(gpu, VIVS_MMUv2_PTA_CONTROL, VIVS_MMUv2_PTA_CONTROL_ENABLE);
208
209 gpu_write(gpu, VIVS_MMUv2_NONSEC_SAFE_ADDR_LOW,
210 lower_32_bits(context->global->bad_page_dma));
211 gpu_write(gpu, VIVS_MMUv2_SEC_SAFE_ADDR_LOW,
212 lower_32_bits(context->global->bad_page_dma));
213 gpu_write(gpu, VIVS_MMUv2_SAFE_ADDRESS_CONFIG,
214 VIVS_MMUv2_SAFE_ADDRESS_CONFIG_NON_SEC_SAFE_ADDR_HIGH(
215 upper_32_bits(context->global->bad_page_dma)) |
216 VIVS_MMUv2_SAFE_ADDRESS_CONFIG_SEC_SAFE_ADDR_HIGH(
217 upper_32_bits(context->global->bad_page_dma)));
218
219 context->global->v2.pta_cpu[v2_context->id] = v2_context->mtlb_dma |
220 VIVS_MMUv2_CONFIGURATION_MODE_MODE4_K;
221
222 /* trigger a PTA load through the FE */
223 prefetch = etnaviv_buffer_config_pta(gpu, id: v2_context->id);
224 etnaviv_gpu_start_fe(gpu, address: (u32)etnaviv_cmdbuf_get_pa(buf: &gpu->buffer),
225 prefetch);
226 etnaviv_gpu_wait_idle(gpu, timeout_ms: 100);
227
228 gpu_write(gpu, VIVS_MMUv2_SEC_CONTROL, VIVS_MMUv2_SEC_CONTROL_ENABLE);
229}
230
231u32 etnaviv_iommuv2_get_mtlb_addr(struct etnaviv_iommu_context *context)
232{
233 struct etnaviv_iommuv2_context *v2_context = to_v2_context(context);
234
235 return v2_context->mtlb_dma;
236}
237
238unsigned short etnaviv_iommuv2_get_pta_id(struct etnaviv_iommu_context *context)
239{
240 struct etnaviv_iommuv2_context *v2_context = to_v2_context(context);
241
242 return v2_context->id;
243}
244static void etnaviv_iommuv2_restore(struct etnaviv_gpu *gpu,
245 struct etnaviv_iommu_context *context)
246{
247 switch (gpu->sec_mode) {
248 case ETNA_SEC_NONE:
249 etnaviv_iommuv2_restore_nonsec(gpu, context);
250 break;
251 case ETNA_SEC_KERNEL:
252 etnaviv_iommuv2_restore_sec(gpu, context);
253 break;
254 default:
255 WARN(1, "unhandled GPU security mode\n");
256 break;
257 }
258}
259
260const struct etnaviv_iommu_ops etnaviv_iommuv2_ops = {
261 .free = etnaviv_iommuv2_free,
262 .map = etnaviv_iommuv2_map,
263 .unmap = etnaviv_iommuv2_unmap,
264 .dump_size = etnaviv_iommuv2_dump_size,
265 .dump = etnaviv_iommuv2_dump,
266 .restore = etnaviv_iommuv2_restore,
267};
268
269struct etnaviv_iommu_context *
270etnaviv_iommuv2_context_alloc(struct etnaviv_iommu_global *global)
271{
272 struct etnaviv_iommuv2_context *v2_context;
273 struct etnaviv_iommu_context *context;
274
275 v2_context = vzalloc(sizeof(*v2_context));
276 if (!v2_context)
277 return NULL;
278
279 mutex_lock(&global->lock);
280 v2_context->id = find_first_zero_bit(addr: global->v2.pta_alloc,
281 ETNAVIV_PTA_ENTRIES);
282 if (v2_context->id < ETNAVIV_PTA_ENTRIES) {
283 set_bit(nr: v2_context->id, addr: global->v2.pta_alloc);
284 } else {
285 mutex_unlock(lock: &global->lock);
286 goto out_free;
287 }
288 mutex_unlock(lock: &global->lock);
289
290 v2_context->mtlb_cpu = dma_alloc_wc(dev: global->dev, SZ_4K,
291 dma_addr: &v2_context->mtlb_dma, GFP_KERNEL);
292 if (!v2_context->mtlb_cpu)
293 goto out_free_id;
294
295 memset32(s: v2_context->mtlb_cpu, MMUv2_PTE_EXCEPTION,
296 MMUv2_MAX_STLB_ENTRIES);
297
298 global->v2.pta_cpu[v2_context->id] = v2_context->mtlb_dma;
299
300 context = &v2_context->base;
301 context->global = global;
302 kref_init(kref: &context->refcount);
303 mutex_init(&context->lock);
304 INIT_LIST_HEAD(list: &context->mappings);
305 drm_mm_init(mm: &context->mm, SZ_4K, size: (u64)SZ_1G * 4 - SZ_4K);
306
307 return context;
308
309out_free_id:
310 clear_bit(nr: v2_context->id, addr: global->v2.pta_alloc);
311out_free:
312 vfree(addr: v2_context);
313 return NULL;
314}
315

source code of linux/drivers/gpu/drm/etnaviv/etnaviv_iommu_v2.c