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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright 2023 Eileen Yoon <eyn@gmx.com> */
#include <linux/iommu.h>
#include <linux/vmalloc.h>
#include "isp-iommu.h"
static void isp_surf_free_pages(struct isp_surf *surf)
{
for (u32 i = 0; i < surf->num_pages && surf->pages[i] != NULL; i++) {
__free_page(surf->pages[i]);
}
kvfree(surf->pages);
}
static int isp_surf_alloc_pages(struct isp_surf *surf)
{
surf->pages = kvmalloc_array(surf->num_pages, sizeof(*surf->pages),
GFP_KERNEL);
if (!surf->pages)
return -ENOMEM;
for (u32 i = 0; i < surf->num_pages; i++) {
surf->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (surf->pages[i] == NULL)
goto free_pages;
}
return 0;
free_pages:
isp_surf_free_pages(surf);
return -ENOMEM;
}
int isp_surf_vmap(struct apple_isp *isp, struct isp_surf *surf)
{
surf->virt = vmap(surf->pages, surf->num_pages, VM_MAP,
pgprot_writecombine(PAGE_KERNEL));
if (surf->virt == NULL) {
dev_err(isp->dev, "failed to vmap size 0x%llx\n", surf->size);
return -EINVAL;
}
return 0;
}
static void isp_surf_vunmap(struct apple_isp *isp, struct isp_surf *surf)
{
if (surf->virt)
vunmap(surf->virt);
surf->virt = NULL;
}
static void isp_surf_unreserve_iova(struct apple_isp *isp,
struct isp_surf *surf)
{
if (surf->mm) {
mutex_lock(&isp->iovad_lock);
drm_mm_remove_node(surf->mm);
mutex_unlock(&isp->iovad_lock);
kfree(surf->mm);
}
surf->mm = NULL;
}
static int isp_surf_reserve_iova(struct apple_isp *isp, struct isp_surf *surf)
{
int err;
surf->mm = kzalloc(sizeof(*surf->mm), GFP_KERNEL);
if (!surf->mm)
return -ENOMEM;
mutex_lock(&isp->iovad_lock);
err = drm_mm_insert_node_generic(&isp->iovad, surf->mm,
ALIGN(surf->size, 1UL << isp->shift),
1UL << isp->shift, 0, 0);
mutex_unlock(&isp->iovad_lock);
if (err < 0) {
dev_err(isp->dev, "failed to reserve 0x%llx of iova space\n",
surf->size);
goto mm_free;
}
surf->iova = surf->mm->start;
return 0;
mm_free:
kfree(surf->mm);
surf->mm = NULL;
return err;
}
static void isp_surf_iommu_unmap(struct apple_isp *isp, struct isp_surf *surf)
{
iommu_unmap(isp->domain, surf->iova, surf->size);
sg_free_table(&surf->sgt);
}
static int isp_surf_iommu_map(struct apple_isp *isp, struct isp_surf *surf)
{
unsigned long size;
int err;
err = sg_alloc_table_from_pages(&surf->sgt, surf->pages,
surf->num_pages, 0, surf->size,
GFP_KERNEL);
if (err < 0) {
dev_err(isp->dev, "failed to alloc sgt from pages\n");
return err;
}
size = iommu_map_sgtable(isp->domain, surf->iova, &surf->sgt,
IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE);
if (size < surf->size) {
dev_err(isp->dev, "failed to iommu_map sgt to iova 0x%llx\n",
surf->iova);
sg_free_table(&surf->sgt);
return -ENXIO;
}
return 0;
}
static void __isp_surf_init(struct apple_isp *isp, struct isp_surf *surf,
u64 size, bool gc)
{
surf->mm = NULL;
surf->virt = NULL;
surf->size = ALIGN(size, 1UL << isp->shift);
surf->num_pages = surf->size >> isp->shift;
surf->gc = gc;
}
struct isp_surf *__isp_alloc_surface(struct apple_isp *isp, u64 size, bool gc)
{
int err;
struct isp_surf *surf = kzalloc(sizeof(struct isp_surf), GFP_KERNEL);
if (!surf)
return NULL;
__isp_surf_init(isp, surf, size, gc);
err = isp_surf_alloc_pages(surf);
if (err < 0) {
dev_err(isp->dev, "failed to allocate %d pages\n",
surf->num_pages);
goto free_surf;
}
err = isp_surf_reserve_iova(isp, surf);
if (err < 0) {
dev_err(isp->dev, "failed to reserve 0x%llx of iova space\n",
surf->size);
goto free_pages;
}
err = isp_surf_iommu_map(isp, surf);
if (err < 0) {
dev_err(isp->dev,
"failed to iommu_map size 0x%llx to iova 0x%llx\n",
surf->size, surf->iova);
goto unreserve_iova;
}
refcount_set(&surf->refcount, 1);
if (surf->gc)
list_add_tail(&surf->head, &isp->gc);
return surf;
unreserve_iova:
isp_surf_unreserve_iova(isp, surf);
free_pages:
isp_surf_free_pages(surf);
free_surf:
kfree(surf);
return NULL;
}
struct isp_surf *isp_alloc_surface_vmap(struct apple_isp *isp, u64 size)
{
int err;
struct isp_surf *surf = __isp_alloc_surface(isp, size, false);
if (!surf)
return NULL;
err = isp_surf_vmap(isp, surf);
if (err < 0) {
dev_err(isp->dev, "failed to vmap iova 0x%llx - 0x%llx\n",
surf->iova, surf->iova + surf->size);
isp_free_surface(isp, surf);
return NULL;
}
return surf;
}
void isp_free_surface(struct apple_isp *isp, struct isp_surf *surf)
{
if (refcount_dec_and_test(&surf->refcount)) {
isp_surf_vunmap(isp, surf);
isp_surf_iommu_unmap(isp, surf);
isp_surf_unreserve_iova(isp, surf);
isp_surf_free_pages(surf);
if (surf->gc)
list_del(&surf->head);
kfree(surf);
}
}
int apple_isp_iommu_map_sgt(struct apple_isp *isp, struct isp_surf *surf,
struct sg_table *sgt, u64 size)
{
int err;
ssize_t mapped;
// TODO userptr sends unaligned sizes
surf->mm = NULL;
surf->size = size;
err = isp_surf_reserve_iova(isp, surf);
if (err < 0) {
dev_err(isp->dev, "failed to reserve 0x%llx of iova space\n",
surf->size);
return err;
}
mapped = iommu_map_sgtable(isp->domain, surf->iova, sgt,
IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE);
if (mapped < surf->size) {
dev_err(isp->dev, "failed to iommu_map sgt to iova 0x%llx\n",
surf->iova);
isp_surf_unreserve_iova(isp, surf);
return -ENXIO;
}
surf->size = mapped;
return 0;
}
void apple_isp_iommu_unmap_sgt(struct apple_isp *isp, struct isp_surf *surf)
{
iommu_unmap(isp->domain, surf->iova, surf->size);
isp_surf_unreserve_iova(isp, surf);
}
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