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/*
* 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.
*/
#define NVKM_VMM_LEVELS_MAX 5
#include "vmm.h"
static void
nvkm_vmm_pt_del(struct nvkm_vmm_pt **ppgt)
{
struct nvkm_vmm_pt *pgt = *ppgt;
if (pgt) {
kvfree(pgt->pde);
kfree(pgt);
*ppgt = NULL;
}
}
static struct nvkm_vmm_pt *
nvkm_vmm_pt_new(const struct nvkm_vmm_desc *desc, bool sparse,
const struct nvkm_vmm_page *page)
{
const u32 pten = 1 << desc->bits;
struct nvkm_vmm_pt *pgt;
u32 lpte = 0;
if (desc->type > PGT) {
if (desc->type == SPT) {
const struct nvkm_vmm_desc *pair = page[-1].desc;
lpte = pten >> (desc->bits - pair->bits);
} else {
lpte = pten;
}
}
if (!(pgt = kzalloc(sizeof(*pgt) + lpte, GFP_KERNEL)))
return NULL;
pgt->page = page ? page->shift : 0;
pgt->sparse = sparse;
if (desc->type == PGD) {
pgt->pde = kvzalloc(sizeof(*pgt->pde) * pten, GFP_KERNEL);
if (!pgt->pde) {
kfree(pgt);
return NULL;
}
}
return pgt;
}
void
nvkm_vmm_dtor(struct nvkm_vmm *vmm)
{
if (vmm->nullp) {
dma_free_coherent(vmm->mmu->subdev.device->dev, 16 * 1024,
vmm->nullp, vmm->null);
}
if (vmm->pd) {
nvkm_mmu_ptc_put(vmm->mmu, true, &vmm->pd->pt[0]);
nvkm_vmm_pt_del(&vmm->pd);
}
}
int
nvkm_vmm_ctor(const struct nvkm_vmm_func *func, struct nvkm_mmu *mmu,
u32 pd_header, u64 addr, u64 size, struct lock_class_key *key,
const char *name, struct nvkm_vmm *vmm)
{
static struct lock_class_key _key;
const struct nvkm_vmm_page *page = func->page;
const struct nvkm_vmm_desc *desc;
int levels, bits = 0;
vmm->func = func;
vmm->mmu = mmu;
vmm->name = name;
kref_init(&vmm->kref);
__mutex_init(&vmm->mutex, "&vmm->mutex", key ? key : &_key);
/* Locate the smallest page size supported by the backend, it will
* have the the deepest nesting of page tables.
*/
while (page[1].shift)
page++;
/* Locate the structure that describes the layout of the top-level
* page table, and determine the number of valid bits in a virtual
* address.
*/
for (levels = 0, desc = page->desc; desc->bits; desc++, levels++)
bits += desc->bits;
bits += page->shift;
desc--;
if (WARN_ON(levels > NVKM_VMM_LEVELS_MAX))
return -EINVAL;
vmm->start = addr;
vmm->limit = size ? (addr + size) : (1ULL << bits);
if (vmm->start > vmm->limit || vmm->limit > (1ULL << bits))
return -EINVAL;
/* Allocate top-level page table. */
vmm->pd = nvkm_vmm_pt_new(desc, false, NULL);
if (!vmm->pd)
return -ENOMEM;
vmm->pd->refs[0] = 1;
INIT_LIST_HEAD(&vmm->join);
/* ... and the GPU storage for it, except on Tesla-class GPUs that
* have the PD embedded in the instance structure.
*/
if (desc->size) {
const u32 size = pd_header + desc->size * (1 << desc->bits);
vmm->pd->pt[0] = nvkm_mmu_ptc_get(mmu, size, desc->align, true);
if (!vmm->pd->pt[0])
return -ENOMEM;
}
return 0;
}
int
nvkm_vmm_new_(const struct nvkm_vmm_func *func, struct nvkm_mmu *mmu,
u32 hdr, u64 addr, u64 size, struct lock_class_key *key,
const char *name, struct nvkm_vmm **pvmm)
{
if (!(*pvmm = kzalloc(sizeof(**pvmm), GFP_KERNEL)))
return -ENOMEM;
return nvkm_vmm_ctor(func, mmu, hdr, addr, size, key, name, *pvmm);
}
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