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/*
* SPDX-License-Identifier: MIT
*
* Copyright © 2014-2016 Intel Corporation
*/
#include <linux/highmem.h>
#include <linux/shmem_fs.h>
#include <linux/swap.h>
#include <drm/drm.h> /* for drm_legacy.h! */
#include <drm/drm_cache.h>
#include "gt/intel_gt.h"
#include "i915_drv.h"
#include "i915_gem_object.h"
#include "i915_gem_region.h"
#include "i915_scatterlist.h"
static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
{
struct address_space *mapping = obj->base.filp->f_mapping;
struct scatterlist *sg;
struct sg_table *st;
dma_addr_t dma;
void *vaddr;
void *dst;
int i;
if (GEM_WARN_ON(i915_gem_object_needs_bit17_swizzle(obj)))
return -EINVAL;
/*
* Always aligning to the object size, allows a single allocation
* to handle all possible callers, and given typical object sizes,
* the alignment of the buddy allocation will naturally match.
*/
vaddr = dma_alloc_coherent(&obj->base.dev->pdev->dev,
roundup_pow_of_two(obj->base.size),
&dma, GFP_KERNEL);
if (!vaddr)
return -ENOMEM;
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (!st)
goto err_pci;
if (sg_alloc_table(st, 1, GFP_KERNEL))
goto err_st;
sg = st->sgl;
sg->offset = 0;
sg->length = obj->base.size;
sg_assign_page(sg, (struct page *)vaddr);
sg_dma_address(sg) = dma;
sg_dma_len(sg) = obj->base.size;
dst = vaddr;
for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {
struct page *page;
void *src;
page = shmem_read_mapping_page(mapping, i);
if (IS_ERR(page))
goto err_st;
src = kmap_atomic(page);
memcpy(dst, src, PAGE_SIZE);
drm_clflush_virt_range(dst, PAGE_SIZE);
kunmap_atomic(src);
put_page(page);
dst += PAGE_SIZE;
}
intel_gt_chipset_flush(&to_i915(obj->base.dev)->gt);
__i915_gem_object_set_pages(obj, st, sg->length);
return 0;
err_st:
kfree(st);
err_pci:
dma_free_coherent(&obj->base.dev->pdev->dev,
roundup_pow_of_two(obj->base.size),
vaddr, dma);
return -ENOMEM;
}
static void
i915_gem_object_put_pages_phys(struct drm_i915_gem_object *obj,
struct sg_table *pages)
{
dma_addr_t dma = sg_dma_address(pages->sgl);
void *vaddr = sg_page(pages->sgl);
__i915_gem_object_release_shmem(obj, pages, false);
if (obj->mm.dirty) {
struct address_space *mapping = obj->base.filp->f_mapping;
void *src = vaddr;
int i;
for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {
struct page *page;
char *dst;
page = shmem_read_mapping_page(mapping, i);
if (IS_ERR(page))
continue;
dst = kmap_atomic(page);
drm_clflush_virt_range(src, PAGE_SIZE);
memcpy(dst, src, PAGE_SIZE);
kunmap_atomic(dst);
set_page_dirty(page);
if (obj->mm.madv == I915_MADV_WILLNEED)
mark_page_accessed(page);
put_page(page);
src += PAGE_SIZE;
}
obj->mm.dirty = false;
}
sg_free_table(pages);
kfree(pages);
dma_free_coherent(&obj->base.dev->pdev->dev,
roundup_pow_of_two(obj->base.size),
vaddr, dma);
}
static void phys_release(struct drm_i915_gem_object *obj)
{
fput(obj->base.filp);
}
static const struct drm_i915_gem_object_ops i915_gem_phys_ops = {
.name = "i915_gem_object_phys",
.get_pages = i915_gem_object_get_pages_phys,
.put_pages = i915_gem_object_put_pages_phys,
.release = phys_release,
};
int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align)
{
struct sg_table *pages;
int err;
if (align > obj->base.size)
return -EINVAL;
if (obj->ops == &i915_gem_phys_ops)
return 0;
if (obj->ops != &i915_gem_shmem_ops)
return -EINVAL;
err = i915_gem_object_unbind(obj, I915_GEM_OBJECT_UNBIND_ACTIVE);
if (err)
return err;
mutex_lock_nested(&obj->mm.lock, I915_MM_GET_PAGES);
if (obj->mm.madv != I915_MADV_WILLNEED) {
err = -EFAULT;
goto err_unlock;
}
if (obj->mm.quirked) {
err = -EFAULT;
goto err_unlock;
}
if (obj->mm.mapping) {
err = -EBUSY;
goto err_unlock;
}
pages = __i915_gem_object_unset_pages(obj);
obj->ops = &i915_gem_phys_ops;
err = ____i915_gem_object_get_pages(obj);
if (err)
goto err_xfer;
/* Perma-pin (until release) the physical set of pages */
__i915_gem_object_pin_pages(obj);
if (!IS_ERR_OR_NULL(pages))
i915_gem_shmem_ops.put_pages(obj, pages);
i915_gem_object_release_memory_region(obj);
mutex_unlock(&obj->mm.lock);
return 0;
err_xfer:
obj->ops = &i915_gem_shmem_ops;
if (!IS_ERR_OR_NULL(pages)) {
unsigned int sg_page_sizes = i915_sg_page_sizes(pages->sgl);
__i915_gem_object_set_pages(obj, pages, sg_page_sizes);
}
err_unlock:
mutex_unlock(&obj->mm.lock);
return err;
}
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/i915_gem_phys.c"
#endif
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