// SPDX-License-Identifier: GPL-2.0
|
/*
|
* Copyright (C) 2018 Intel Corporation
|
* Copyright 2018 Google LLC.
|
*
|
* Author: Tomasz Figa <tfiga@chromium.org>
|
* Author: Yong Zhi <yong.zhi@intel.com>
|
*/
|
|
#include <linux/vmalloc.h>
|
|
#include "ipu3.h"
|
#include "ipu3-css-pool.h"
|
#include "ipu3-mmu.h"
|
#include "ipu3-dmamap.h"
|
|
/*
|
* Free a buffer allocated by imgu_dmamap_alloc_buffer()
|
*/
|
static void imgu_dmamap_free_buffer(struct page **pages,
|
size_t size)
|
{
|
int count = size >> PAGE_SHIFT;
|
|
while (count--)
|
__free_page(pages[count]);
|
kvfree(pages);
|
}
|
|
/*
|
* Based on the implementation of __iommu_dma_alloc_pages()
|
* defined in drivers/iommu/dma-iommu.c
|
*/
|
static struct page **imgu_dmamap_alloc_buffer(size_t size, gfp_t gfp)
|
{
|
struct page **pages;
|
unsigned int i = 0, count = size >> PAGE_SHIFT;
|
unsigned int order_mask = 1;
|
const gfp_t high_order_gfp = __GFP_NOWARN | __GFP_NORETRY;
|
|
/* Allocate mem for array of page ptrs */
|
pages = kvmalloc_array(count, sizeof(*pages), GFP_KERNEL);
|
|
if (!pages)
|
return NULL;
|
|
gfp |= __GFP_HIGHMEM | __GFP_ZERO;
|
|
while (count) {
|
struct page *page = NULL;
|
unsigned int order_size;
|
|
for (order_mask &= (2U << __fls(count)) - 1;
|
order_mask; order_mask &= ~order_size) {
|
unsigned int order = __fls(order_mask);
|
|
order_size = 1U << order;
|
page = alloc_pages((order_mask - order_size) ?
|
gfp | high_order_gfp : gfp, order);
|
if (!page)
|
continue;
|
if (!order)
|
break;
|
if (!PageCompound(page)) {
|
split_page(page, order);
|
break;
|
}
|
|
__free_pages(page, order);
|
}
|
if (!page) {
|
imgu_dmamap_free_buffer(pages, i << PAGE_SHIFT);
|
return NULL;
|
}
|
count -= order_size;
|
while (order_size--)
|
pages[i++] = page++;
|
}
|
|
return pages;
|
}
|
|
/**
|
* imgu_dmamap_alloc - allocate and map a buffer into KVA
|
* @imgu: struct device pointer
|
* @map: struct to store mapping variables
|
* @len: size required
|
*
|
* Returns:
|
* KVA on success
|
* %NULL on failure
|
*/
|
void *imgu_dmamap_alloc(struct imgu_device *imgu, struct imgu_css_map *map,
|
size_t len)
|
{
|
unsigned long shift = iova_shift(&imgu->iova_domain);
|
struct device *dev = &imgu->pci_dev->dev;
|
size_t size = PAGE_ALIGN(len);
|
int count = size >> PAGE_SHIFT;
|
struct page **pages;
|
dma_addr_t iovaddr;
|
struct iova *iova;
|
int i, rval;
|
|
dev_dbg(dev, "%s: allocating %zu\n", __func__, size);
|
|
iova = alloc_iova(&imgu->iova_domain, size >> shift,
|
imgu->mmu->aperture_end >> shift, 0);
|
if (!iova)
|
return NULL;
|
|
pages = imgu_dmamap_alloc_buffer(size, GFP_KERNEL);
|
if (!pages)
|
goto out_free_iova;
|
|
/* Call IOMMU driver to setup pgt */
|
iovaddr = iova_dma_addr(&imgu->iova_domain, iova);
|
for (i = 0; i < count; ++i) {
|
rval = imgu_mmu_map(imgu->mmu, iovaddr,
|
page_to_phys(pages[i]), PAGE_SIZE);
|
if (rval)
|
goto out_unmap;
|
|
iovaddr += PAGE_SIZE;
|
}
|
|
map->vaddr = vmap(pages, count, VM_USERMAP, PAGE_KERNEL);
|
if (!map->vaddr)
|
goto out_unmap;
|
|
map->pages = pages;
|
map->size = size;
|
map->daddr = iova_dma_addr(&imgu->iova_domain, iova);
|
|
dev_dbg(dev, "%s: allocated %zu @ IOVA %pad @ VA %p\n", __func__,
|
size, &map->daddr, map->vaddr);
|
|
return map->vaddr;
|
|
out_unmap:
|
imgu_dmamap_free_buffer(pages, size);
|
imgu_mmu_unmap(imgu->mmu, iova_dma_addr(&imgu->iova_domain, iova),
|
i * PAGE_SIZE);
|
|
out_free_iova:
|
__free_iova(&imgu->iova_domain, iova);
|
|
return NULL;
|
}
|
|
void imgu_dmamap_unmap(struct imgu_device *imgu, struct imgu_css_map *map)
|
{
|
struct iova *iova;
|
|
iova = find_iova(&imgu->iova_domain,
|
iova_pfn(&imgu->iova_domain, map->daddr));
|
if (WARN_ON(!iova))
|
return;
|
|
imgu_mmu_unmap(imgu->mmu, iova_dma_addr(&imgu->iova_domain, iova),
|
iova_size(iova) << iova_shift(&imgu->iova_domain));
|
|
__free_iova(&imgu->iova_domain, iova);
|
}
|
|
/*
|
* Counterpart of imgu_dmamap_alloc
|
*/
|
void imgu_dmamap_free(struct imgu_device *imgu, struct imgu_css_map *map)
|
{
|
dev_dbg(&imgu->pci_dev->dev, "%s: freeing %zu @ IOVA %pad @ VA %p\n",
|
__func__, map->size, &map->daddr, map->vaddr);
|
|
if (!map->vaddr)
|
return;
|
|
imgu_dmamap_unmap(imgu, map);
|
|
vunmap(map->vaddr);
|
imgu_dmamap_free_buffer(map->pages, map->size);
|
map->vaddr = NULL;
|
}
|
|
int imgu_dmamap_map_sg(struct imgu_device *imgu, struct scatterlist *sglist,
|
int nents, struct imgu_css_map *map)
|
{
|
unsigned long shift = iova_shift(&imgu->iova_domain);
|
struct scatterlist *sg;
|
struct iova *iova;
|
size_t size = 0;
|
int i;
|
|
for_each_sg(sglist, sg, nents, i) {
|
if (sg->offset)
|
return -EINVAL;
|
|
if (i != nents - 1 && !PAGE_ALIGNED(sg->length))
|
return -EINVAL;
|
|
size += sg->length;
|
}
|
|
size = iova_align(&imgu->iova_domain, size);
|
dev_dbg(&imgu->pci_dev->dev, "dmamap: mapping sg %d entries, %zu pages\n",
|
nents, size >> shift);
|
|
iova = alloc_iova(&imgu->iova_domain, size >> shift,
|
imgu->mmu->aperture_end >> shift, 0);
|
if (!iova)
|
return -ENOMEM;
|
|
dev_dbg(&imgu->pci_dev->dev, "dmamap: iova low pfn %lu, high pfn %lu\n",
|
iova->pfn_lo, iova->pfn_hi);
|
|
if (imgu_mmu_map_sg(imgu->mmu, iova_dma_addr(&imgu->iova_domain, iova),
|
sglist, nents) < size)
|
goto out_fail;
|
|
memset(map, 0, sizeof(*map));
|
map->daddr = iova_dma_addr(&imgu->iova_domain, iova);
|
map->size = size;
|
|
return 0;
|
|
out_fail:
|
__free_iova(&imgu->iova_domain, iova);
|
|
return -EFAULT;
|
}
|
|
int imgu_dmamap_init(struct imgu_device *imgu)
|
{
|
unsigned long order, base_pfn;
|
int ret = iova_cache_get();
|
|
if (ret)
|
return ret;
|
|
order = __ffs(IPU3_PAGE_SIZE);
|
base_pfn = max_t(unsigned long, 1, imgu->mmu->aperture_start >> order);
|
init_iova_domain(&imgu->iova_domain, 1UL << order, base_pfn);
|
|
return 0;
|
}
|
|
void imgu_dmamap_exit(struct imgu_device *imgu)
|
{
|
put_iova_domain(&imgu->iova_domain);
|
iova_cache_put();
|
}
|
