[linux-2.6-block.git] / drivers / gpu / drm / nouveau / nvkm / subdev / mmu / uvmm.c

/*
 * Copyright 2017 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */
#include "uvmm.h"
#include "umem.h"
#include "ummu.h"

#include <core/client.h>
#include <core/memory.h>

#include <nvif/if000c.h>
#include <nvif/unpack.h>

static const struct nvkm_object_func nvkm_uvmm;
struct nvkm_vmm *
nvkm_uvmm_search(struct nvkm_client *client, u64 handle)
{
	struct nvkm_object *object;

	object = nvkm_object_search(client, handle, &nvkm_uvmm);
	if (IS_ERR(object))
		return (void *)object;

	return nvkm_uvmm(object)->vmm;
}

static int
nvkm_uvmm_mthd_unmap(struct nvkm_uvmm *uvmm, void *argv, u32 argc)
{
	struct nvkm_client *client = uvmm->object.client;
	union {
		struct nvif_vmm_unmap_v0 v0;
	} *args = argv;
	struct nvkm_vmm *vmm = uvmm->vmm;
	struct nvkm_vma *vma;
	int ret = -ENOSYS;
	u64 addr;

	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
		addr = args->v0.addr;
	} else
		return ret;

	mutex_lock(&vmm->mutex);
	vma = nvkm_vmm_node_search(vmm, addr);
	if (ret = -ENOENT, !vma || vma->addr != addr) {
		VMM_DEBUG(vmm, "lookup %016llx: %016llx",
			  addr, vma ? vma->addr : ~0ULL);
		goto done;
	}

	if (ret = -ENOENT, (!vma->user && !client->super) || vma->busy) {
		VMM_DEBUG(vmm, "denied %016llx: %d %d %d", addr,
			  vma->user, !client->super, vma->busy);
		goto done;
	}

	if (ret = -EINVAL, !vma->memory) {
		VMM_DEBUG(vmm, "unmapped");
		goto done;
	}

	nvkm_vmm_unmap_locked(vmm, vma);
	ret = 0;
done:
	mutex_unlock(&vmm->mutex);
	return ret;
}

static int
nvkm_uvmm_mthd_map(struct nvkm_uvmm *uvmm, void *argv, u32 argc)
{
	struct nvkm_client *client = uvmm->object.client;
	union {
		struct nvif_vmm_map_v0 v0;
	} *args = argv;
	u64 addr, size, handle, offset;
	struct nvkm_vmm *vmm = uvmm->vmm;
	struct nvkm_vma *vma;
	struct nvkm_memory *memory;
	int ret = -ENOSYS;

	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, true))) {
		addr = args->v0.addr;
		size = args->v0.size;
		handle = args->v0.memory;
		offset = args->v0.offset;
	} else
		return ret;

	memory = nvkm_umem_search(client, handle);
	if (IS_ERR(memory)) {
		VMM_DEBUG(vmm, "memory %016llx %ld\n", handle, PTR_ERR(memory));
		return PTR_ERR(memory);
	}

	mutex_lock(&vmm->mutex);
	if (ret = -ENOENT, !(vma = nvkm_vmm_node_search(vmm, addr))) {
		VMM_DEBUG(vmm, "lookup %016llx", addr);
		goto fail;
	}

	if (ret = -ENOENT, (!vma->user && !client->super) || vma->busy) {
		VMM_DEBUG(vmm, "denied %016llx: %d %d %d", addr,
			  vma->user, !client->super, vma->busy);
		goto fail;
	}

	if (ret = -EINVAL, vma->addr != addr || vma->size != size) {
		if (addr + size > vma->addr + vma->size || vma->memory ||
		    (vma->refd == NVKM_VMA_PAGE_NONE && !vma->mapref)) {
			VMM_DEBUG(vmm, "split %d %d %d "
				       "%016llx %016llx %016llx %016llx",
				  !!vma->memory, vma->refd, vma->mapref,
				  addr, size, vma->addr, (u64)vma->size);
			goto fail;
		}

		vma = nvkm_vmm_node_split(vmm, vma, addr, size);
		if (!vma) {
			ret = -ENOMEM;
			goto fail;
		}
	}
	vma->busy = true;
	mutex_unlock(&vmm->mutex);

	ret = nvkm_memory_map(memory, offset, vmm, vma, argv, argc);
	if (ret == 0) {
		/* Successful map will clear vma->busy. */
		nvkm_memory_unref(&memory);
		return 0;
	}

	mutex_lock(&vmm->mutex);
	vma->busy = false;
	nvkm_vmm_unmap_region(vmm, vma);
fail:
	mutex_unlock(&vmm->mutex);
	nvkm_memory_unref(&memory);
	return ret;
}

static int
nvkm_uvmm_mthd_put(struct nvkm_uvmm *uvmm, void *argv, u32 argc)
{
	struct nvkm_client *client = uvmm->object.client;
	union {
		struct nvif_vmm_put_v0 v0;
	} *args = argv;
	struct nvkm_vmm *vmm = uvmm->vmm;
	struct nvkm_vma *vma;
	int ret = -ENOSYS;
	u64 addr;

	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
		addr = args->v0.addr;
	} else
		return ret;

	mutex_lock(&vmm->mutex);
	vma = nvkm_vmm_node_search(vmm, args->v0.addr);
	if (ret = -ENOENT, !vma || vma->addr != addr || vma->part) {
		VMM_DEBUG(vmm, "lookup %016llx: %016llx %d", addr,
			  vma ? vma->addr : ~0ULL, vma ? vma->part : 0);
		goto done;
	}

	if (ret = -ENOENT, (!vma->user && !client->super) || vma->busy) {
		VMM_DEBUG(vmm, "denied %016llx: %d %d %d", addr,
			  vma->user, !client->super, vma->busy);
		goto done;
	}

	nvkm_vmm_put_locked(vmm, vma);
	ret = 0;
done:
	mutex_unlock(&vmm->mutex);
	return ret;
}

static int
nvkm_uvmm_mthd_get(struct nvkm_uvmm *uvmm, void *argv, u32 argc)
{
	struct nvkm_client *client = uvmm->object.client;
	union {
		struct nvif_vmm_get_v0 v0;
	} *args = argv;
	struct nvkm_vmm *vmm = uvmm->vmm;
	struct nvkm_vma *vma;
	int ret = -ENOSYS;
	bool getref, mapref, sparse;
	u8 page, align;
	u64 size;

	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
		getref = args->v0.type == NVIF_VMM_GET_V0_PTES;
		mapref = args->v0.type == NVIF_VMM_GET_V0_ADDR;
		sparse = args->v0.sparse;
		page = args->v0.page;
		align = args->v0.align;
		size = args->v0.size;
	} else
		return ret;

	mutex_lock(&vmm->mutex);
	ret = nvkm_vmm_get_locked(vmm, getref, mapref, sparse,
				  page, align, size, &vma);
	mutex_unlock(&vmm->mutex);
	if (ret)
		return ret;

	args->v0.addr = vma->addr;
	vma->user = !client->super;
	return ret;
}

static int
nvkm_uvmm_mthd_page(struct nvkm_uvmm *uvmm, void *argv, u32 argc)
{
	union {
		struct nvif_vmm_page_v0 v0;
	} *args = argv;
	const struct nvkm_vmm_page *page;
	int ret = -ENOSYS;
	u8 type, index, nr;

	page = uvmm->vmm->func->page;
	for (nr = 0; page[nr].shift; nr++);

	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
		if ((index = args->v0.index) >= nr)
			return -EINVAL;
		type = page[index].type;
		args->v0.shift = page[index].shift;
		args->v0.sparse = !!(type & NVKM_VMM_PAGE_SPARSE);
		args->v0.vram = !!(type & NVKM_VMM_PAGE_VRAM);
		args->v0.host = !!(type & NVKM_VMM_PAGE_HOST);
		args->v0.comp = !!(type & NVKM_VMM_PAGE_COMP);
	} else
		return -ENOSYS;

	return 0;
}

static int
nvkm_uvmm_mthd(struct nvkm_object *object, u32 mthd, void *argv, u32 argc)
{
	struct nvkm_uvmm *uvmm = nvkm_uvmm(object);
	switch (mthd) {
	case NVIF_VMM_V0_PAGE  : return nvkm_uvmm_mthd_page  (uvmm, argv, argc);
	case NVIF_VMM_V0_GET   : return nvkm_uvmm_mthd_get   (uvmm, argv, argc);
	case NVIF_VMM_V0_PUT   : return nvkm_uvmm_mthd_put   (uvmm, argv, argc);
	case NVIF_VMM_V0_MAP   : return nvkm_uvmm_mthd_map   (uvmm, argv, argc);
	case NVIF_VMM_V0_UNMAP : return nvkm_uvmm_mthd_unmap (uvmm, argv, argc);
	default:
		break;
	}
	return -EINVAL;
}

static void *
nvkm_uvmm_dtor(struct nvkm_object *object)
{
	struct nvkm_uvmm *uvmm = nvkm_uvmm(object);
	nvkm_vmm_unref(&uvmm->vmm);
	return uvmm;
}

static const struct nvkm_object_func
nvkm_uvmm = {
	.dtor = nvkm_uvmm_dtor,
	.mthd = nvkm_uvmm_mthd,
};

int
nvkm_uvmm_new(const struct nvkm_oclass *oclass, void *argv, u32 argc,
	      struct nvkm_object **pobject)
{
	struct nvkm_mmu *mmu = nvkm_ummu(oclass->parent)->mmu;
	const bool more = oclass->base.maxver >= 0;
	union {
		struct nvif_vmm_v0 v0;
	} *args = argv;
	const struct nvkm_vmm_page *page;
	struct nvkm_uvmm *uvmm;
	int ret = -ENOSYS;
	u64 addr, size;

	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, more))) {
		addr = args->v0.addr;
		size = args->v0.size;
	} else
		return ret;

	if (!(uvmm = kzalloc(sizeof(*uvmm), GFP_KERNEL)))
		return -ENOMEM;
	nvkm_object_ctor(&nvkm_uvmm, oclass, &uvmm->object);
	*pobject = &uvmm->object;

	if (!mmu->vmm) {
		ret = mmu->func->vmm.ctor(mmu, addr, size, argv, argc,
					  NULL, "user", &uvmm->vmm);
		if (ret)
			return ret;

		uvmm->vmm->debug = max(uvmm->vmm->debug, oclass->client->debug);
	} else {
		if (size)
			return -EINVAL;

		uvmm->vmm = nvkm_vmm_ref(mmu->vmm);
	}

	page = uvmm->vmm->func->page;
	args->v0.page_nr = 0;
	while (page && (page++)->shift)
		args->v0.page_nr++;
	args->v0.addr = uvmm->vmm->start;
	args->v0.size = uvmm->vmm->limit;
	return 0;
}
Commit	Line	Data
920d2b5e BS	1	/*
	2	* Copyright 2017 Red Hat Inc.
	3	*
	4	* Permission is hereby granted, free of charge, to any person obtaining a
	5	* copy of this software and associated documentation files (the "Software"),
	6	* to deal in the Software without restriction, including without limitation
	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	8	* and/or sell copies of the Software, and to permit persons to whom the
	9	* Software is furnished to do so, subject to the following conditions:
	10	*
	11	* The above copyright notice and this permission notice shall be included in
	12	* all copies or substantial portions of the Software.
	13	*
	14	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	15	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	17	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	18	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	19	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	20	* OTHER DEALINGS IN THE SOFTWARE.
	21	*/
	22	#include "uvmm.h"
	23	#include "umem.h"
	24	#include "ummu.h"
	25
	26	#include <core/client.h>
	27	#include <core/memory.h>
	28
	29	#include <nvif/if000c.h>
	30	#include <nvif/unpack.h>
	31
	32	static const struct nvkm_object_func nvkm_uvmm;
	33	struct nvkm_vmm *
	34	nvkm_uvmm_search(struct nvkm_client *client, u64 handle)
	35	{
	36	struct nvkm_object *object;
	37
	38	object = nvkm_object_search(client, handle, &nvkm_uvmm);
	39	if (IS_ERR(object))
	40	return (void *)object;
	41
	42	return nvkm_uvmm(object)->vmm;
	43	}
	44
	45	static int
	46	nvkm_uvmm_mthd_unmap(struct nvkm_uvmm uvmm, void argv, u32 argc)
	47	{
	48	struct nvkm_client *client = uvmm->object.client;
	49	union {
	50	struct nvif_vmm_unmap_v0 v0;
	51	} *args = argv;
	52	struct nvkm_vmm *vmm = uvmm->vmm;
	53	struct nvkm_vma *vma;
	54	int ret = -ENOSYS;
	55	u64 addr;
	56
	57	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
	58	addr = args->v0.addr;
	59	} else
	60	return ret;
	61
	62	mutex_lock(&vmm->mutex);
	63	vma = nvkm_vmm_node_search(vmm, addr);
	64	if (ret = -ENOENT, !vma \|\| vma->addr != addr) {
65	VMM_DEBUG(vmm, "lookup %016llx: %016llx",
66	addr, vma ? vma->addr : ~0ULL);
67	goto done;
68	}
69
70	if (ret = -ENOENT, (!vma->user && !client->super) \|\| vma->busy) {
71	VMM_DEBUG(vmm, "denied %016llx: %d %d %d", addr,
72	vma->user, !client->super, vma->busy);
73	goto done;
74	}
75
76	if (ret = -EINVAL, !vma->memory) {
77	VMM_DEBUG(vmm, "unmapped");
78	goto done;
79	}
80
81	nvkm_vmm_unmap_locked(vmm, vma);
82	ret = 0;
83	done:
84	mutex_unlock(&vmm->mutex);
85	return ret;
86	}
87
88	static int
89	nvkm_uvmm_mthd_map(struct nvkm_uvmm uvmm, void argv, u32 argc)
90	{
91	struct nvkm_client *client = uvmm->object.client;
92	union {
93	struct nvif_vmm_map_v0 v0;
94	} *args = argv;
95	u64 addr, size, handle, offset;
96	struct nvkm_vmm *vmm = uvmm->vmm;
97	struct nvkm_vma *vma;
98	struct nvkm_memory *memory;
99	int ret = -ENOSYS;
100
101	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, true))) {
102	addr = args->v0.addr;
103	size = args->v0.size;
104	handle = args->v0.memory;
105	offset = args->v0.offset;
106	} else
107	return ret;
108
94ee54dc CB	109	memory = nvkm_umem_search(client, handle);
94ee54dc CB	110	if (IS_ERR(memory)) {
920d2b5e BS	111	VMM_DEBUG(vmm, "memory %016llx %ld\n", handle, PTR_ERR(memory));
	112	return PTR_ERR(memory);
	113	}
	114
	115	mutex_lock(&vmm->mutex);
	116	if (ret = -ENOENT, !(vma = nvkm_vmm_node_search(vmm, addr))) {
	117	VMM_DEBUG(vmm, "lookup %016llx", addr);
	118	goto fail;
	119	}
	120
	121	if (ret = -ENOENT, (!vma->user && !client->super) \|\| vma->busy) {
	122	VMM_DEBUG(vmm, "denied %016llx: %d %d %d", addr,
	123	vma->user, !client->super, vma->busy);
	124	goto fail;
	125	}
	126
	127	if (ret = -EINVAL, vma->addr != addr \|\| vma->size != size) {
	128	if (addr + size > vma->addr + vma->size \|\| vma->memory \|\|
	129	(vma->refd == NVKM_VMA_PAGE_NONE && !vma->mapref)) {
	130	VMM_DEBUG(vmm, "split %d %d %d "
	131	"%016llx %016llx %016llx %016llx",
	132	!!vma->memory, vma->refd, vma->mapref,
	133	addr, size, vma->addr, (u64)vma->size);
	134	goto fail;
	135	}
	136
729eba33 BS	137	vma = nvkm_vmm_node_split(vmm, vma, addr, size);
	138	if (!vma) {
	139	ret = -ENOMEM;
	140	goto fail;
920d2b5e BS	141	}
	142	}
	143	vma->busy = true;
	144	mutex_unlock(&vmm->mutex);
	145
	146	ret = nvkm_memory_map(memory, offset, vmm, vma, argv, argc);
	147	if (ret == 0) {
	148	/* Successful map will clear vma->busy. */
	149	nvkm_memory_unref(&memory);
	150	return 0;
	151	}
	152
	153	mutex_lock(&vmm->mutex);
	154	vma->busy = false;
	155	nvkm_vmm_unmap_region(vmm, vma);
	156	fail:
	157	mutex_unlock(&vmm->mutex);
	158	nvkm_memory_unref(&memory);
	159	return ret;
	160	}
	161
	162	static int
	163	nvkm_uvmm_mthd_put(struct nvkm_uvmm uvmm, void argv, u32 argc)
	164	{
	165	struct nvkm_client *client = uvmm->object.client;
	166	union {
	167	struct nvif_vmm_put_v0 v0;
	168	} *args = argv;
	169	struct nvkm_vmm *vmm = uvmm->vmm;
	170	struct nvkm_vma *vma;
	171	int ret = -ENOSYS;
	172	u64 addr;
	173
	174	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
	175	addr = args->v0.addr;
	176	} else
	177	return ret;
	178
	179	mutex_lock(&vmm->mutex);
	180	vma = nvkm_vmm_node_search(vmm, args->v0.addr);
	181	if (ret = -ENOENT, !vma \|\| vma->addr != addr \|\| vma->part) {
	182	VMM_DEBUG(vmm, "lookup %016llx: %016llx %d", addr,
	183	vma ? vma->addr : ~0ULL, vma ? vma->part : 0);
	184	goto done;
	185	}
	186
	187	if (ret = -ENOENT, (!vma->user && !client->super) \|\| vma->busy) {
	188	VMM_DEBUG(vmm, "denied %016llx: %d %d %d", addr,
	189	vma->user, !client->super, vma->busy);
	190	goto done;
	191	}
	192
	193	nvkm_vmm_put_locked(vmm, vma);
	194	ret = 0;
	195	done:
	196	mutex_unlock(&vmm->mutex);
	197	return ret;
	198	}
	199
	200	static int
	201	nvkm_uvmm_mthd_get(struct nvkm_uvmm uvmm, void argv, u32 argc)
	202	{
	203	struct nvkm_client *client = uvmm->object.client;
	204	union {
205	struct nvif_vmm_get_v0 v0;
206	} *args = argv;
207	struct nvkm_vmm *vmm = uvmm->vmm;
208	struct nvkm_vma *vma;
209	int ret = -ENOSYS;
210	bool getref, mapref, sparse;
211	u8 page, align;
212	u64 size;
213
214	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
215	getref = args->v0.type == NVIF_VMM_GET_V0_PTES;
216	mapref = args->v0.type == NVIF_VMM_GET_V0_ADDR;
217	sparse = args->v0.sparse;
218	page = args->v0.page;
219	align = args->v0.align;
220	size = args->v0.size;
221	} else
222	return ret;
223
224	mutex_lock(&vmm->mutex);
225	ret = nvkm_vmm_get_locked(vmm, getref, mapref, sparse,
226	page, align, size, &vma);
227	mutex_unlock(&vmm->mutex);
228	if (ret)
229	return ret;
230
231	args->v0.addr = vma->addr;
232	vma->user = !client->super;
233	return ret;
234	}
235
236	static int
237	nvkm_uvmm_mthd_page(struct nvkm_uvmm uvmm, void argv, u32 argc)
238	{
239	union {
240	struct nvif_vmm_page_v0 v0;
241	} *args = argv;
242	const struct nvkm_vmm_page *page;
243	int ret = -ENOSYS;
244	u8 type, index, nr;
245
246	page = uvmm->vmm->func->page;
247	for (nr = 0; page[nr].shift; nr++);
248
249	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
250	if ((index = args->v0.index) >= nr)
251	return -EINVAL;
252	type = page[index].type;
253	args->v0.shift = page[index].shift;
254	args->v0.sparse = !!(type & NVKM_VMM_PAGE_SPARSE);
255	args->v0.vram = !!(type & NVKM_VMM_PAGE_VRAM);
256	args->v0.host = !!(type & NVKM_VMM_PAGE_HOST);
257	args->v0.comp = !!(type & NVKM_VMM_PAGE_COMP);
258	} else
259	return -ENOSYS;
260
261	return 0;
262	}
263
264	static int
265	nvkm_uvmm_mthd(struct nvkm_object object, u32 mthd, void argv, u32 argc)
266	{
267	struct nvkm_uvmm *uvmm = nvkm_uvmm(object);
268	switch (mthd) {
269	case NVIF_VMM_V0_PAGE : return nvkm_uvmm_mthd_page (uvmm, argv, argc);
270	case NVIF_VMM_V0_GET : return nvkm_uvmm_mthd_get (uvmm, argv, argc);
271	case NVIF_VMM_V0_PUT : return nvkm_uvmm_mthd_put (uvmm, argv, argc);
272	case NVIF_VMM_V0_MAP : return nvkm_uvmm_mthd_map (uvmm, argv, argc);
273	case NVIF_VMM_V0_UNMAP : return nvkm_uvmm_mthd_unmap (uvmm, argv, argc);
274	default:
275	break;
276	}
277	return -EINVAL;
278	}
279
280	static void *
281	nvkm_uvmm_dtor(struct nvkm_object *object)
282	{
283	struct nvkm_uvmm *uvmm = nvkm_uvmm(object);
284	nvkm_vmm_unref(&uvmm->vmm);
285	return uvmm;
286	}
287
288	static const struct nvkm_object_func
289	nvkm_uvmm = {
290	.dtor = nvkm_uvmm_dtor,
291	.mthd = nvkm_uvmm_mthd,
292	};
293
294	int
295	nvkm_uvmm_new(const struct nvkm_oclass oclass, void argv, u32 argc,
296	struct nvkm_object **pobject)
297	{
298	struct nvkm_mmu *mmu = nvkm_ummu(oclass->parent)->mmu;
299	const bool more = oclass->base.maxver >= 0;
300	union {
301	struct nvif_vmm_v0 v0;
302	} *args = argv;
303	const struct nvkm_vmm_page *page;
304	struct nvkm_uvmm *uvmm;
305	int ret = -ENOSYS;
306	u64 addr, size;
307
308	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, more))) {
309	addr = args->v0.addr;
310	size = args->v0.size;
311	} else
312	return ret;
313
314	if (!(uvmm = kzalloc(sizeof(*uvmm), GFP_KERNEL)))
315	return -ENOMEM;
316	nvkm_object_ctor(&nvkm_uvmm, oclass, &uvmm->object);
317	*pobject = &uvmm->object;
318
319	if (!mmu->vmm) {
320	ret = mmu->func->vmm.ctor(mmu, addr, size, argv, argc,
321	NULL, "user", &uvmm->vmm);
322	if (ret)
323	return ret;
324
325	uvmm->vmm->debug = max(uvmm->vmm->debug, oclass->client->debug);
326	} else {
327	if (size)
328	return -EINVAL;
329
330	uvmm->vmm = nvkm_vmm_ref(mmu->vmm);
331	}
332
333	page = uvmm->vmm->func->page;
334	args->v0.page_nr = 0;
335	while (page && (page++)->shift)
336	args->v0.page_nr++;
337	args->v0.addr = uvmm->vmm->start;
338	args->v0.size = uvmm->vmm->limit;
339	return 0;
340	}