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  1/*
  2 * Copyright (C) 2016 Etnaviv Project
  3  *
  4 * This program is free software; you can redistribute it and/or modify it
  5 * under the terms of the GNU General Public License version 2 as published by
  6 * the Free Software Foundation.
  7 *
  8 * This program is distributed in the hope that it will be useful, but WITHOUT
  9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 10 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 11 * more details.
 12 *
 13 * You should have received a copy of the GNU General Public License along with
 14 * this program.  If not, see <http://www.gnu.org/licenses/>.
 15 */
 16
 17#include <linux/platform_device.h>
 18#include <linux/sizes.h>
 19#include <linux/slab.h>
 20#include <linux/dma-mapping.h>
 21#include <linux/bitops.h>
 22
 23#include "etnaviv_cmdbuf.h"
 24#include "etnaviv_gpu.h"
 25#include "etnaviv_mmu.h"
 26#include "etnaviv_iommu.h"
 27#include "state.xml.h"
 28#include "state_hi.xml.h"
 29
 30#define MMUv2_PTE_PRESENT		BIT(0)
 31#define MMUv2_PTE_EXCEPTION		BIT(1)
 32#define MMUv2_PTE_WRITEABLE		BIT(2)
 33
 34#define MMUv2_MTLB_MASK			0xffc00000
 35#define MMUv2_MTLB_SHIFT		22
 36#define MMUv2_STLB_MASK			0x003ff000
 37#define MMUv2_STLB_SHIFT		12
 38
 39#define MMUv2_MAX_STLB_ENTRIES		1024
 40
 41struct etnaviv_iommuv2_domain {
 42	struct etnaviv_iommu_domain base;
 43	/* P(age) T(able) A(rray) */
 44	u64 *pta_cpu;
 45	dma_addr_t pta_dma;
 46	/* M(aster) TLB aka first level pagetable */
 47	u32 *mtlb_cpu;
 48	dma_addr_t mtlb_dma;
 49	/* S(lave) TLB aka second level pagetable */
 50	u32 *stlb_cpu[1024];
 51	dma_addr_t stlb_dma[1024];
 52};
 53
 54static struct etnaviv_iommuv2_domain *
 55to_etnaviv_domain(struct etnaviv_iommu_domain *domain)
 56{
 57	return container_of(domain, struct etnaviv_iommuv2_domain, base);
 58}
 59
 60static int etnaviv_iommuv2_map(struct etnaviv_iommu_domain *domain,
 61			       unsigned long iova, phys_addr_t paddr,
 62			       size_t size, int prot)
 63{
 64	struct etnaviv_iommuv2_domain *etnaviv_domain =
 65			to_etnaviv_domain(domain);
 66	int mtlb_entry, stlb_entry;
 67	u32 entry = (u32)paddr | MMUv2_PTE_PRESENT;
 68
 69	if (size != SZ_4K)
 70		return -EINVAL;
 71
 72	if (prot & ETNAVIV_PROT_WRITE)
 73		entry |= MMUv2_PTE_WRITEABLE;
 74
 75	mtlb_entry = (iova & MMUv2_MTLB_MASK) >> MMUv2_MTLB_SHIFT;
 76	stlb_entry = (iova & MMUv2_STLB_MASK) >> MMUv2_STLB_SHIFT;
 77
 78	etnaviv_domain->stlb_cpu[mtlb_entry][stlb_entry] = entry;
 79
 80	return 0;
 81}
 82
 83static size_t etnaviv_iommuv2_unmap(struct etnaviv_iommu_domain *domain,
 84				    unsigned long iova, size_t size)
 85{
 86	struct etnaviv_iommuv2_domain *etnaviv_domain =
 87			to_etnaviv_domain(domain);
 88	int mtlb_entry, stlb_entry;
 89
 90	if (size != SZ_4K)
 91		return -EINVAL;
 92
 93	mtlb_entry = (iova & MMUv2_MTLB_MASK) >> MMUv2_MTLB_SHIFT;
 94	stlb_entry = (iova & MMUv2_STLB_MASK) >> MMUv2_STLB_SHIFT;
 95
 96	etnaviv_domain->stlb_cpu[mtlb_entry][stlb_entry] = MMUv2_PTE_EXCEPTION;
 97
 98	return SZ_4K;
 99}
100
101static int etnaviv_iommuv2_init(struct etnaviv_iommuv2_domain *etnaviv_domain)
102{
103	u32 *p;
104	int ret, i, j;
105
106	/* allocate scratch page */
107	etnaviv_domain->base.bad_page_cpu = dma_alloc_coherent(
108						etnaviv_domain->base.dev,
109						SZ_4K,
110						&etnaviv_domain->base.bad_page_dma,
111						GFP_KERNEL);
112	if (!etnaviv_domain->base.bad_page_cpu) {
113		ret = -ENOMEM;
114		goto fail_mem;
115	}
116	p = etnaviv_domain->base.bad_page_cpu;
117	for (i = 0; i < SZ_4K / 4; i++)
118		*p++ = 0xdead55aa;
119
120	etnaviv_domain->pta_cpu = dma_alloc_coherent(etnaviv_domain->base.dev,
121						     SZ_4K,
122						     &etnaviv_domain->pta_dma,
123						     GFP_KERNEL);
124	if (!etnaviv_domain->pta_cpu) {
125		ret = -ENOMEM;
126		goto fail_mem;
127	}
128
129	etnaviv_domain->mtlb_cpu = dma_alloc_coherent(etnaviv_domain->base.dev,
130						  SZ_4K,
131						  &etnaviv_domain->mtlb_dma,
132						  GFP_KERNEL);
133	if (!etnaviv_domain->mtlb_cpu) {
134		ret = -ENOMEM;
135		goto fail_mem;
136	}
137
138	/* pre-populate STLB pages (may want to switch to on-demand later) */
139	for (i = 0; i < MMUv2_MAX_STLB_ENTRIES; i++) {
140		etnaviv_domain->stlb_cpu[i] =
141				dma_alloc_coherent(etnaviv_domain->base.dev,
142						   SZ_4K,
143						   &etnaviv_domain->stlb_dma[i],
144						   GFP_KERNEL);
145		if (!etnaviv_domain->stlb_cpu[i]) {
146			ret = -ENOMEM;
147			goto fail_mem;
148		}
149		p = etnaviv_domain->stlb_cpu[i];
150		for (j = 0; j < SZ_4K / 4; j++)
151			*p++ = MMUv2_PTE_EXCEPTION;
152
153		etnaviv_domain->mtlb_cpu[i] = etnaviv_domain->stlb_dma[i] |
154					      MMUv2_PTE_PRESENT;
155	}
156
157	return 0;
158
159fail_mem:
160	if (etnaviv_domain->base.bad_page_cpu)
161		dma_free_coherent(etnaviv_domain->base.dev, SZ_4K,
162				  etnaviv_domain->base.bad_page_cpu,
163				  etnaviv_domain->base.bad_page_dma);
164
165	if (etnaviv_domain->pta_cpu)
166		dma_free_coherent(etnaviv_domain->base.dev, SZ_4K,
167				  etnaviv_domain->pta_cpu,
168				  etnaviv_domain->pta_dma);
169
170	if (etnaviv_domain->mtlb_cpu)
171		dma_free_coherent(etnaviv_domain->base.dev, SZ_4K,
172				  etnaviv_domain->mtlb_cpu,
173				  etnaviv_domain->mtlb_dma);
174
175	for (i = 0; i < MMUv2_MAX_STLB_ENTRIES; i++) {
176		if (etnaviv_domain->stlb_cpu[i])
177			dma_free_coherent(etnaviv_domain->base.dev, SZ_4K,
178					  etnaviv_domain->stlb_cpu[i],
179					  etnaviv_domain->stlb_dma[i]);
180	}
181
182	return ret;
183}
184
185static void etnaviv_iommuv2_domain_free(struct etnaviv_iommu_domain *domain)
186{
187	struct etnaviv_iommuv2_domain *etnaviv_domain =
188			to_etnaviv_domain(domain);
189	int i;
190
191	dma_free_coherent(etnaviv_domain->base.dev, SZ_4K,
192			  etnaviv_domain->base.bad_page_cpu,
193			  etnaviv_domain->base.bad_page_dma);
194
195	dma_free_coherent(etnaviv_domain->base.dev, SZ_4K,
196			  etnaviv_domain->pta_cpu,
197			  etnaviv_domain->pta_dma);
198
199	dma_free_coherent(etnaviv_domain->base.dev, SZ_4K,
200			  etnaviv_domain->mtlb_cpu,
201			  etnaviv_domain->mtlb_dma);
202
203	for (i = 0; i < MMUv2_MAX_STLB_ENTRIES; i++) {
204		if (etnaviv_domain->stlb_cpu[i])
205			dma_free_coherent(etnaviv_domain->base.dev, SZ_4K,
206					  etnaviv_domain->stlb_cpu[i],
207					  etnaviv_domain->stlb_dma[i]);
208	}
209
210	vfree(etnaviv_domain);
211}
212
213static size_t etnaviv_iommuv2_dump_size(struct etnaviv_iommu_domain *domain)
214{
215	struct etnaviv_iommuv2_domain *etnaviv_domain =
216			to_etnaviv_domain(domain);
217	size_t dump_size = SZ_4K;
218	int i;
219
220	for (i = 0; i < MMUv2_MAX_STLB_ENTRIES; i++)
221		if (etnaviv_domain->mtlb_cpu[i] & MMUv2_PTE_PRESENT)
222			dump_size += SZ_4K;
223
224	return dump_size;
225}
226
227static void etnaviv_iommuv2_dump(struct etnaviv_iommu_domain *domain, void *buf)
228{
229	struct etnaviv_iommuv2_domain *etnaviv_domain =
230			to_etnaviv_domain(domain);
231	int i;
232
233	memcpy(buf, etnaviv_domain->mtlb_cpu, SZ_4K);
234	buf += SZ_4K;
235	for (i = 0; i < MMUv2_MAX_STLB_ENTRIES; i++, buf += SZ_4K)
236		if (etnaviv_domain->mtlb_cpu[i] & MMUv2_PTE_PRESENT)
237			memcpy(buf, etnaviv_domain->stlb_cpu[i], SZ_4K);
238}
239
240static void etnaviv_iommuv2_restore_nonsec(struct etnaviv_gpu *gpu)
241{
242	struct etnaviv_iommuv2_domain *etnaviv_domain =
243			to_etnaviv_domain(gpu->mmu->domain);
244	u16 prefetch;
245
246	/* If the MMU is already enabled the state is still there. */
247	if (gpu_read(gpu, VIVS_MMUv2_CONTROL) & VIVS_MMUv2_CONTROL_ENABLE)
248		return;
249
250	prefetch = etnaviv_buffer_config_mmuv2(gpu,
251				(u32)etnaviv_domain->mtlb_dma,
252				(u32)etnaviv_domain->base.bad_page_dma);
253	etnaviv_gpu_start_fe(gpu, (u32)etnaviv_cmdbuf_get_pa(&gpu->buffer),
254			     prefetch);
255	etnaviv_gpu_wait_idle(gpu, 100);
256
257	gpu_write(gpu, VIVS_MMUv2_CONTROL, VIVS_MMUv2_CONTROL_ENABLE);
258}
259
260static void etnaviv_iommuv2_restore_sec(struct etnaviv_gpu *gpu)
261{
262	struct etnaviv_iommuv2_domain *etnaviv_domain =
263				to_etnaviv_domain(gpu->mmu->domain);
264	u16 prefetch;
265
266	/* If the MMU is already enabled the state is still there. */
267	if (gpu_read(gpu, VIVS_MMUv2_SEC_CONTROL) & VIVS_MMUv2_SEC_CONTROL_ENABLE)
268		return;
269
270	gpu_write(gpu, VIVS_MMUv2_PTA_ADDRESS_LOW,
271		  lower_32_bits(etnaviv_domain->pta_dma));
272	gpu_write(gpu, VIVS_MMUv2_PTA_ADDRESS_HIGH,
273		  upper_32_bits(etnaviv_domain->pta_dma));
274	gpu_write(gpu, VIVS_MMUv2_PTA_CONTROL, VIVS_MMUv2_PTA_CONTROL_ENABLE);
275
276	gpu_write(gpu, VIVS_MMUv2_NONSEC_SAFE_ADDR_LOW,
277		  lower_32_bits(etnaviv_domain->base.bad_page_dma));
278	gpu_write(gpu, VIVS_MMUv2_SEC_SAFE_ADDR_LOW,
279		  lower_32_bits(etnaviv_domain->base.bad_page_dma));
280	gpu_write(gpu, VIVS_MMUv2_SAFE_ADDRESS_CONFIG,
281		  VIVS_MMUv2_SAFE_ADDRESS_CONFIG_NON_SEC_SAFE_ADDR_HIGH(
282		  upper_32_bits(etnaviv_domain->base.bad_page_dma)) |
283		  VIVS_MMUv2_SAFE_ADDRESS_CONFIG_SEC_SAFE_ADDR_HIGH(
284		  upper_32_bits(etnaviv_domain->base.bad_page_dma)));
285
286	etnaviv_domain->pta_cpu[0] = etnaviv_domain->mtlb_dma |
287				     VIVS_MMUv2_CONFIGURATION_MODE_MODE4_K;
288
289	/* trigger a PTA load through the FE */
290	prefetch = etnaviv_buffer_config_pta(gpu);
291	etnaviv_gpu_start_fe(gpu, (u32)etnaviv_cmdbuf_get_pa(&gpu->buffer),
292			     prefetch);
293	etnaviv_gpu_wait_idle(gpu, 100);
294
295	gpu_write(gpu, VIVS_MMUv2_SEC_CONTROL, VIVS_MMUv2_SEC_CONTROL_ENABLE);
296}
297
298void etnaviv_iommuv2_restore(struct etnaviv_gpu *gpu)
299{
300	switch (gpu->sec_mode) {
301	case ETNA_SEC_NONE:
302		etnaviv_iommuv2_restore_nonsec(gpu);
303		break;
304	case ETNA_SEC_KERNEL:
305		etnaviv_iommuv2_restore_sec(gpu);
306		break;
307	default:
308		WARN(1, "unhandled GPU security mode\n");
309		break;
310	}
311}
312
313static const struct etnaviv_iommu_domain_ops etnaviv_iommuv2_ops = {
314	.free = etnaviv_iommuv2_domain_free,
315	.map = etnaviv_iommuv2_map,
316	.unmap = etnaviv_iommuv2_unmap,
317	.dump_size = etnaviv_iommuv2_dump_size,
318	.dump = etnaviv_iommuv2_dump,
319};
320
321struct etnaviv_iommu_domain *
322etnaviv_iommuv2_domain_alloc(struct etnaviv_gpu *gpu)
323{
324	struct etnaviv_iommuv2_domain *etnaviv_domain;
325	struct etnaviv_iommu_domain *domain;
326	int ret;
327
328	etnaviv_domain = vzalloc(sizeof(*etnaviv_domain));
329	if (!etnaviv_domain)
330		return NULL;
331
332	domain = &etnaviv_domain->base;
333
334	domain->dev = gpu->dev;
335	domain->base = 0;
336	domain->size = (u64)SZ_1G * 4;
337	domain->ops = &etnaviv_iommuv2_ops;
338
339	ret = etnaviv_iommuv2_init(etnaviv_domain);
340	if (ret)
341		goto out_free;
342
343	return &etnaviv_domain->base;
344
345out_free:
346	vfree(etnaviv_domain);
347	return NULL;
348}