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|
// SPDX-License-Identifier: GPL-2.0+
/* Copyright (C) 2015-2018 Broadcom */
/**
* DOC: V3D GEM BO management support
*
* Compared to VC4 (V3D 2.x), V3D 3.3 introduces an MMU between the
* GPU and the bus, allowing us to use shmem objects for our storage
* instead of CMA.
*
* Physically contiguous objects may still be imported to V3D, but the
* driver doesn't allocate physically contiguous objects on its own.
* Display engines requiring physically contiguous allocations should
* look into Mesa's "renderonly" support (as used by the Mesa pl111
* driver) for an example of how to integrate with V3D.
*
* Long term, we should support evicting pages from the MMU when under
* memory pressure (thus the v3d_bo_get_pages() refcounting), but
* that's not a high priority since our systems tend to not have swap.
*/
#include <linux/dma-buf.h>
#include <linux/pfn_t.h>
#include "v3d_drv.h"
#include "uapi/drm/v3d_drm.h"
/* Pins the shmem pages, fills in the .pages and .sgt fields of the BO, and maps
* it for DMA.
*/
static int
v3d_bo_get_pages(struct v3d_bo *bo)
{
struct drm_gem_object *obj = &bo->base;
struct drm_device *dev = obj->dev;
int npages = obj->size >> PAGE_SHIFT;
int ret = 0;
mutex_lock(&bo->lock);
if (bo->pages_refcount++ != 0)
goto unlock;
if (!obj->import_attach) {
bo->pages = drm_gem_get_pages(obj);
if (IS_ERR(bo->pages)) {
ret = PTR_ERR(bo->pages);
goto unlock;
}
bo->sgt = drm_prime_pages_to_sg(bo->pages, npages);
if (IS_ERR(bo->sgt)) {
ret = PTR_ERR(bo->sgt);
goto put_pages;
}
/* Map the pages for use by the GPU. */
dma_map_sg(dev->dev, bo->sgt->sgl,
bo->sgt->nents, DMA_BIDIRECTIONAL);
} else {
bo->pages = kcalloc(npages, sizeof(*bo->pages), GFP_KERNEL);
if (!bo->pages)
goto put_pages;
drm_prime_sg_to_page_addr_arrays(bo->sgt, bo->pages,
NULL, npages);
/* Note that dma-bufs come in mapped. */
}
mutex_unlock(&bo->lock);
return 0;
put_pages:
drm_gem_put_pages(obj, bo->pages, true, true);
bo->pages = NULL;
unlock:
bo->pages_refcount--;
mutex_unlock(&bo->lock);
return ret;
}
static void
v3d_bo_put_pages(struct v3d_bo *bo)
{
struct drm_gem_object *obj = &bo->base;
mutex_lock(&bo->lock);
if (--bo->pages_refcount == 0) {
if (!obj->import_attach) {
dma_unmap_sg(obj->dev->dev, bo->sgt->sgl,
bo->sgt->nents, DMA_BIDIRECTIONAL);
sg_free_table(bo->sgt);
kfree(bo->sgt);
drm_gem_put_pages(obj, bo->pages, true, true);
} else {
kfree(bo->pages);
}
}
mutex_unlock(&bo->lock);
}
static struct v3d_bo *v3d_bo_create_struct(struct drm_device *dev,
size_t unaligned_size)
{
struct v3d_dev *v3d = to_v3d_dev(dev);
struct drm_gem_object *obj;
struct v3d_bo *bo;
size_t size = roundup(unaligned_size, PAGE_SIZE);
int ret;
if (size == 0)
return ERR_PTR(-EINVAL);
bo = kzalloc(sizeof(*bo), GFP_KERNEL);
if (!bo)
return ERR_PTR(-ENOMEM);
obj = &bo->base;
INIT_LIST_HEAD(&bo->vmas);
INIT_LIST_HEAD(&bo->unref_head);
mutex_init(&bo->lock);
ret = drm_gem_object_init(dev, obj, size);
if (ret)
goto free_bo;
spin_lock(&v3d->mm_lock);
ret = drm_mm_insert_node_generic(&v3d->mm, &bo->node,
obj->size >> PAGE_SHIFT,
GMP_GRANULARITY >> PAGE_SHIFT, 0, 0);
spin_unlock(&v3d->mm_lock);
if (ret)
goto free_obj;
return bo;
free_obj:
drm_gem_object_release(obj);
free_bo:
kfree(bo);
return ERR_PTR(ret);
}
struct v3d_bo *v3d_bo_create(struct drm_device *dev, struct drm_file *file_priv,
size_t unaligned_size)
{
struct v3d_dev *v3d = to_v3d_dev(dev);
struct drm_gem_object *obj;
struct v3d_bo *bo;
int ret;
bo = v3d_bo_create_struct(dev, unaligned_size);
if (IS_ERR(bo))
return bo;
obj = &bo->base;
bo->resv = &bo->_resv;
reservation_object_init(bo->resv);
ret = v3d_bo_get_pages(bo);
if (ret)
goto free_mm;
v3d_mmu_insert_ptes(bo);
mutex_lock(&v3d->bo_lock);
v3d->bo_stats.num_allocated++;
v3d->bo_stats.pages_allocated += obj->size >> PAGE_SHIFT;
mutex_unlock(&v3d->bo_lock);
return bo;
free_mm:
spin_lock(&v3d->mm_lock);
drm_mm_remove_node(&bo->node);
spin_unlock(&v3d->mm_lock);
drm_gem_object_release(obj);
kfree(bo);
return ERR_PTR(ret);
}
/* Called DRM core on the last userspace/kernel unreference of the
* BO.
*/
void v3d_free_object(struct drm_gem_object *obj)
{
struct v3d_dev *v3d = to_v3d_dev(obj->dev);
struct v3d_bo *bo = to_v3d_bo(obj);
mutex_lock(&v3d->bo_lock);
v3d->bo_stats.num_allocated--;
v3d->bo_stats.pages_allocated -= obj->size >> PAGE_SHIFT;
mutex_unlock(&v3d->bo_lock);
reservation_object_fini(&bo->_resv);
v3d_bo_put_pages(bo);
if (obj->import_attach)
drm_prime_gem_destroy(obj, bo->sgt);
v3d_mmu_remove_ptes(bo);
spin_lock(&v3d->mm_lock);
drm_mm_remove_node(&bo->node);
spin_unlock(&v3d->mm_lock);
mutex_destroy(&bo->lock);
drm_gem_object_release(obj);
kfree(bo);
}
struct reservation_object *v3d_prime_res_obj(struct drm_gem_object *obj)
{
struct v3d_bo *bo = to_v3d_bo(obj);
return bo->resv;
}
static void
v3d_set_mmap_vma_flags(struct vm_area_struct *vma)
{
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_flags |= VM_MIXEDMAP;
vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
}
vm_fault_t v3d_gem_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct drm_gem_object *obj = vma->vm_private_data;
struct v3d_bo *bo = to_v3d_bo(obj);
pfn_t pfn;
pgoff_t pgoff;
/* We don't use vmf->pgoff since that has the fake offset: */
pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
pfn = __pfn_to_pfn_t(page_to_pfn(bo->pages[pgoff]), PFN_DEV);
return vmf_insert_mixed(vma, vmf->address, pfn);
}
int v3d_mmap(struct file *filp, struct vm_area_struct *vma)
{
int ret;
ret = drm_gem_mmap(filp, vma);
if (ret)
return ret;
v3d_set_mmap_vma_flags(vma);
return ret;
}
int v3d_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
{
int ret;
ret = drm_gem_mmap_obj(obj, obj->size, vma);
if (ret < 0)
return ret;
v3d_set_mmap_vma_flags(vma);
return 0;
}
struct sg_table *
v3d_prime_get_sg_table(struct drm_gem_object *obj)
{
struct v3d_bo *bo = to_v3d_bo(obj);
int npages = obj->size >> PAGE_SHIFT;
return drm_prime_pages_to_sg(bo->pages, npages);
}
struct drm_gem_object *
v3d_prime_import_sg_table(struct drm_device *dev,
struct dma_buf_attachment *attach,
struct sg_table *sgt)
{
struct drm_gem_object *
|