linux/drivers/gpu/drm/etnaviv/etnaviv_gem.c
Dave Airlie 2646699f4b Merge branch 'etnaviv/next' of https://git.pengutronix.de/git/lst/linux into drm-next
Nothing too exciting:
- a cleanup of our clock handling and improved error handling in this
area from Lubomir
- conversion to pin_user_pages for long page references from John
- fixed PM runtime API error handling from Navid

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Lucas Stach <l.stach@pengutronix.de>
Link: https://patchwork.freedesktop.org/patch/msgid/d9e2660d71051bf3cab8aa7afc9f62102ac910d9.camel@pengutronix.de
2020-07-23 15:28:10 +10:00

748 lines
18 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2015-2018 Etnaviv Project
*/
#include <drm/drm_prime.h>
#include <linux/dma-mapping.h>
#include <linux/shmem_fs.h>
#include <linux/spinlock.h>
#include <linux/vmalloc.h>
#include "etnaviv_drv.h"
#include "etnaviv_gem.h"
#include "etnaviv_gpu.h"
#include "etnaviv_mmu.h"
static struct lock_class_key etnaviv_shm_lock_class;
static struct lock_class_key etnaviv_userptr_lock_class;
static void etnaviv_gem_scatter_map(struct etnaviv_gem_object *etnaviv_obj)
{
struct drm_device *dev = etnaviv_obj->base.dev;
struct sg_table *sgt = etnaviv_obj->sgt;
/*
* For non-cached buffers, ensure the new pages are clean
* because display controller, GPU, etc. are not coherent.
*/
if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
dma_map_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
}
static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj)
{
struct drm_device *dev = etnaviv_obj->base.dev;
struct sg_table *sgt = etnaviv_obj->sgt;
/*
* For non-cached buffers, ensure the new pages are clean
* because display controller, GPU, etc. are not coherent:
*
* WARNING: The DMA API does not support concurrent CPU
* and device access to the memory area. With BIDIRECTIONAL,
* we will clean the cache lines which overlap the region,
* and invalidate all cache lines (partially) contained in
* the region.
*
* If you have dirty data in the overlapping cache lines,
* that will corrupt the GPU-written data. If you have
* written into the remainder of the region, this can
* discard those writes.
*/
if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
dma_unmap_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
}
/* called with etnaviv_obj->lock held */
static int etnaviv_gem_shmem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
{
struct drm_device *dev = etnaviv_obj->base.dev;
struct page **p = drm_gem_get_pages(&etnaviv_obj->base);
if (IS_ERR(p)) {
dev_dbg(dev->dev, "could not get pages: %ld\n", PTR_ERR(p));
return PTR_ERR(p);
}
etnaviv_obj->pages = p;
return 0;
}
static void put_pages(struct etnaviv_gem_object *etnaviv_obj)
{
if (etnaviv_obj->sgt) {
etnaviv_gem_scatterlist_unmap(etnaviv_obj);
sg_free_table(etnaviv_obj->sgt);
kfree(etnaviv_obj->sgt);
etnaviv_obj->sgt = NULL;
}
if (etnaviv_obj->pages) {
drm_gem_put_pages(&etnaviv_obj->base, etnaviv_obj->pages,
true, false);
etnaviv_obj->pages = NULL;
}
}
struct page **etnaviv_gem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
{
int ret;
lockdep_assert_held(&etnaviv_obj->lock);
if (!etnaviv_obj->pages) {
ret = etnaviv_obj->ops->get_pages(etnaviv_obj);
if (ret < 0)
return ERR_PTR(ret);
}
if (!etnaviv_obj->sgt) {
struct drm_device *dev = etnaviv_obj->base.dev;
int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
struct sg_table *sgt;
sgt = drm_prime_pages_to_sg(etnaviv_obj->pages, npages);
if (IS_ERR(sgt)) {
dev_err(dev->dev, "failed to allocate sgt: %ld\n",
PTR_ERR(sgt));
return ERR_CAST(sgt);
}
etnaviv_obj->sgt = sgt;
etnaviv_gem_scatter_map(etnaviv_obj);
}
return etnaviv_obj->pages;
}
void etnaviv_gem_put_pages(struct etnaviv_gem_object *etnaviv_obj)
{
lockdep_assert_held(&etnaviv_obj->lock);
/* when we start tracking the pin count, then do something here */
}
static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
struct vm_area_struct *vma)
{
pgprot_t vm_page_prot;
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_flags |= VM_MIXEDMAP;
vm_page_prot = vm_get_page_prot(vma->vm_flags);
if (etnaviv_obj->flags & ETNA_BO_WC) {
vma->vm_page_prot = pgprot_writecombine(vm_page_prot);
} else if (etnaviv_obj->flags & ETNA_BO_UNCACHED) {
vma->vm_page_prot = pgprot_noncached(vm_page_prot);
} else {
/*
* Shunt off cached objs to shmem file so they have their own
* address_space (so unmap_mapping_range does what we want,
* in particular in the case of mmap'd dmabufs)
*/
fput(vma->vm_file);
get_file(etnaviv_obj->base.filp);
vma->vm_pgoff = 0;
vma->vm_file = etnaviv_obj->base.filp;
vma->vm_page_prot = vm_page_prot;
}
return 0;
}
int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct etnaviv_gem_object *obj;
int ret;
ret = drm_gem_mmap(filp, vma);
if (ret) {
DBG("mmap failed: %d", ret);
return ret;
}
obj = to_etnaviv_bo(vma->vm_private_data);
return obj->ops->mmap(obj, vma);
}
vm_fault_t etnaviv_gem_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct drm_gem_object *obj = vma->vm_private_data;
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
struct page **pages, *page;
pgoff_t pgoff;
int err;
/*
* Make sure we don't parallel update on a fault, nor move or remove
* something from beneath our feet. Note that vmf_insert_page() is
* specifically coded to take care of this, so we don't have to.
*/
err = mutex_lock_interruptible(&etnaviv_obj->lock);
if (err)
return VM_FAULT_NOPAGE;
/* make sure we have pages attached now */
pages = etnaviv_gem_get_pages(etnaviv_obj);
mutex_unlock(&etnaviv_obj->lock);
if (IS_ERR(pages)) {
err = PTR_ERR(pages);
return vmf_error(err);
}
/* We don't use vmf->pgoff since that has the fake offset: */
pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
page = pages[pgoff];
VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT);
return vmf_insert_page(vma, vmf->address, page);
}
int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset)
{
int ret;
/* Make it mmapable */
ret = drm_gem_create_mmap_offset(obj);
if (ret)
dev_err(obj->dev->dev, "could not allocate mmap offset\n");
else
*offset = drm_vma_node_offset_addr(&obj->vma_node);
return ret;
}
static struct etnaviv_vram_mapping *
etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj,
struct etnaviv_iommu_context *context)
{
struct etnaviv_vram_mapping *mapping;
list_for_each_entry(mapping, &obj->vram_list, obj_node) {
if (mapping->context == context)
return mapping;
}
return NULL;
}
void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping)
{
struct etnaviv_gem_object *etnaviv_obj = mapping->object;
mutex_lock(&etnaviv_obj->lock);
WARN_ON(mapping->use == 0);
mapping->use -= 1;
mutex_unlock(&etnaviv_obj->lock);
drm_gem_object_put(&etnaviv_obj->base);
}
struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
struct drm_gem_object *obj, struct etnaviv_iommu_context *mmu_context,
u64 va)
{
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
struct etnaviv_vram_mapping *mapping;
struct page **pages;
int ret = 0;
mutex_lock(&etnaviv_obj->lock);
mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, mmu_context);
if (mapping) {
/*
* Holding the object lock prevents the use count changing
* beneath us. If the use count is zero, the MMU might be
* reaping this object, so take the lock and re-check that
* the MMU owns this mapping to close this race.
*/
if (mapping->use == 0) {
mutex_lock(&mmu_context->lock);
if (mapping->context == mmu_context)
mapping->use += 1;
else
mapping = NULL;
mutex_unlock(&mmu_context->lock);
if (mapping)
goto out;
} else {
mapping->use += 1;
goto out;
}
}
pages = etnaviv_gem_get_pages(etnaviv_obj);
if (IS_ERR(pages)) {
ret = PTR_ERR(pages);
goto out;
}
/*
* See if we have a reaped vram mapping we can re-use before
* allocating a fresh mapping.
*/
mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
if (!mapping) {
mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
if (!mapping) {
ret = -ENOMEM;
goto out;
}
INIT_LIST_HEAD(&mapping->scan_node);
mapping->object = etnaviv_obj;
} else {
list_del(&mapping->obj_node);
}
etnaviv_iommu_context_get(mmu_context);
mapping->context = mmu_context;
mapping->use = 1;
ret = etnaviv_iommu_map_gem(mmu_context, etnaviv_obj,
mmu_context->global->memory_base,
mapping, va);
if (ret < 0) {
etnaviv_iommu_context_put(mmu_context);
kfree(mapping);
} else {
list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
}
out:
mutex_unlock(&etnaviv_obj->lock);
if (ret)
return ERR_PTR(ret);
/* Take a reference on the object */
drm_gem_object_get(obj);
return mapping;
}
void *etnaviv_gem_vmap(struct drm_gem_object *obj)
{
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
if (etnaviv_obj->vaddr)
return etnaviv_obj->vaddr;
mutex_lock(&etnaviv_obj->lock);
/*
* Need to check again, as we might have raced with another thread
* while waiting for the mutex.
*/
if (!etnaviv_obj->vaddr)
etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj);
mutex_unlock(&etnaviv_obj->lock);
return etnaviv_obj->vaddr;
}
static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
{
struct page **pages;
lockdep_assert_held(&obj->lock);
pages = etnaviv_gem_get_pages(obj);
if (IS_ERR(pages))
return NULL;
return vmap(pages, obj->base.size >> PAGE_SHIFT,
VM_MAP, pgprot_writecombine(PAGE_KERNEL));
}
static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
{
if (op & ETNA_PREP_READ)
return DMA_FROM_DEVICE;
else if (op & ETNA_PREP_WRITE)
return DMA_TO_DEVICE;
else
return DMA_BIDIRECTIONAL;
}
int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
struct drm_etnaviv_timespec *timeout)
{
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
struct drm_device *dev = obj->dev;
bool write = !!(op & ETNA_PREP_WRITE);
int ret;
if (!etnaviv_obj->sgt) {
void *ret;
mutex_lock(&etnaviv_obj->lock);
ret = etnaviv_gem_get_pages(etnaviv_obj);
mutex_unlock(&etnaviv_obj->lock);
if (IS_ERR(ret))
return PTR_ERR(ret);
}
if (op & ETNA_PREP_NOSYNC) {
if (!dma_resv_test_signaled_rcu(obj->resv,
write))
return -EBUSY;
} else {
unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
ret = dma_resv_wait_timeout_rcu(obj->resv,
write, true, remain);
if (ret <= 0)
return ret == 0 ? -ETIMEDOUT : ret;
}
if (etnaviv_obj->flags & ETNA_BO_CACHED) {
dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl,
etnaviv_obj->sgt->nents,
etnaviv_op_to_dma_dir(op));
etnaviv_obj->last_cpu_prep_op = op;
}
return 0;
}
int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
if (etnaviv_obj->flags & ETNA_BO_CACHED) {
/* fini without a prep is almost certainly a userspace error */
WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
dma_sync_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl,
etnaviv_obj->sgt->nents,
etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
etnaviv_obj->last_cpu_prep_op = 0;
}
return 0;
}
int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
struct drm_etnaviv_timespec *timeout)
{
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
}
#ifdef CONFIG_DEBUG_FS
static void etnaviv_gem_describe_fence(struct dma_fence *fence,
const char *type, struct seq_file *m)
{
if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
seq_printf(m, "\t%9s: %s %s seq %llu\n",
type,
fence->ops->get_driver_name(fence),
fence->ops->get_timeline_name(fence),
fence->seqno);
}
static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
{
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
struct dma_resv *robj = obj->resv;
struct dma_resv_list *fobj;
struct dma_fence *fence;
unsigned long off = drm_vma_node_start(&obj->vma_node);
seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
obj->name, kref_read(&obj->refcount),
off, etnaviv_obj->vaddr, obj->size);
rcu_read_lock();
fobj = rcu_dereference(robj->fence);
if (fobj) {
unsigned int i, shared_count = fobj->shared_count;
for (i = 0; i < shared_count; i++) {
fence = rcu_dereference(fobj->shared[i]);
etnaviv_gem_describe_fence(fence, "Shared", m);
}
}
fence = rcu_dereference(robj->fence_excl);
if (fence)
etnaviv_gem_describe_fence(fence, "Exclusive", m);
rcu_read_unlock();
}
void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
struct seq_file *m)
{
struct etnaviv_gem_object *etnaviv_obj;
int count = 0;
size_t size = 0;
mutex_lock(&priv->gem_lock);
list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
struct drm_gem_object *obj = &etnaviv_obj->base;
seq_puts(m, " ");
etnaviv_gem_describe(obj, m);
count++;
size += obj->size;
}
mutex_unlock(&priv->gem_lock);
seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
}
#endif
static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
{
vunmap(etnaviv_obj->vaddr);
put_pages(etnaviv_obj);
}
static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
.get_pages = etnaviv_gem_shmem_get_pages,
.release = etnaviv_gem_shmem_release,
.vmap = etnaviv_gem_vmap_impl,
.mmap = etnaviv_gem_mmap_obj,
};
void etnaviv_gem_free_object(struct drm_gem_object *obj)
{
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
struct etnaviv_drm_private *priv = obj->dev->dev_private;
struct etnaviv_vram_mapping *mapping, *tmp;
/* object should not be active */
WARN_ON(is_active(etnaviv_obj));
mutex_lock(&priv->gem_lock);
list_del(&etnaviv_obj->gem_node);
mutex_unlock(&priv->gem_lock);
list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
obj_node) {
struct etnaviv_iommu_context *context = mapping->context;
WARN_ON(mapping->use);
if (context) {
etnaviv_iommu_unmap_gem(context, mapping);
etnaviv_iommu_context_put(context);
}
list_del(&mapping->obj_node);
kfree(mapping);
}
drm_gem_free_mmap_offset(obj);
etnaviv_obj->ops->release(etnaviv_obj);
drm_gem_object_release(obj);
kfree(etnaviv_obj);
}
void etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
{
struct etnaviv_drm_private *priv = dev->dev_private;
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
mutex_lock(&priv->gem_lock);
list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
mutex_unlock(&priv->gem_lock);
}
static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags,
const struct etnaviv_gem_ops *ops, struct drm_gem_object **obj)
{
struct etnaviv_gem_object *etnaviv_obj;
unsigned sz = sizeof(*etnaviv_obj);
bool valid = true;
/* validate flags */
switch (flags & ETNA_BO_CACHE_MASK) {
case ETNA_BO_UNCACHED:
case ETNA_BO_CACHED:
case ETNA_BO_WC:
break;
default:
valid = false;
}
if (!valid) {
dev_err(dev->dev, "invalid cache flag: %x\n",
(flags & ETNA_BO_CACHE_MASK));
return -EINVAL;
}
etnaviv_obj = kzalloc(sz, GFP_KERNEL);
if (!etnaviv_obj)
return -ENOMEM;
etnaviv_obj->flags = flags;
etnaviv_obj->ops = ops;
mutex_init(&etnaviv_obj->lock);
INIT_LIST_HEAD(&etnaviv_obj->vram_list);
*obj = &etnaviv_obj->base;
return 0;
}
/* convenience method to construct a GEM buffer object, and userspace handle */
int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
u32 size, u32 flags, u32 *handle)
{
struct etnaviv_drm_private *priv = dev->dev_private;
struct drm_gem_object *obj = NULL;
int ret;
size = PAGE_ALIGN(size);
ret = etnaviv_gem_new_impl(dev, size, flags,
&etnaviv_gem_shmem_ops, &obj);
if (ret)
goto fail;
lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class);
ret = drm_gem_object_init(dev, obj, size);
if (ret)
goto fail;
/*
* Our buffers are kept pinned, so allocating them from the MOVABLE
* zone is a really bad idea, and conflicts with CMA. See comments
* above new_inode() why this is required _and_ expected if you're
* going to pin these pages.
*/
mapping_set_gfp_mask(obj->filp->f_mapping, priv->shm_gfp_mask);
etnaviv_gem_obj_add(dev, obj);
ret = drm_gem_handle_create(file, obj, handle);
/* drop reference from allocate - handle holds it now */
fail:
drm_gem_object_put(obj);
return ret;
}
int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
const struct etnaviv_gem_ops *ops, struct etnaviv_gem_object **res)
{
struct drm_gem_object *obj;
int ret;
ret = etnaviv_gem_new_impl(dev, size, flags, ops, &obj);
if (ret)
return ret;
drm_gem_private_object_init(dev, obj, size);
*res = to_etnaviv_bo(obj);
return 0;
}
static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
{
struct page **pvec = NULL;
struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr;
int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
might_lock_read(&current->mm->mmap_lock);
if (userptr->mm != current->mm)
return -EPERM;
pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
if (!pvec)
return -ENOMEM;
do {
unsigned num_pages = npages - pinned;
uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE;
struct page **pages = pvec + pinned;
ret = pin_user_pages_fast(ptr, num_pages,
!userptr->ro ? FOLL_WRITE : 0, pages);
if (ret < 0) {
unpin_user_pages(pvec, pinned);
kvfree(pvec);
return ret;
}
pinned += ret;
} while (pinned < npages);
etnaviv_obj->pages = pvec;
return 0;
}
static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
{
if (etnaviv_obj->sgt) {
etnaviv_gem_scatterlist_unmap(etnaviv_obj);
sg_free_table(etnaviv_obj->sgt);
kfree(etnaviv_obj->sgt);
}
if (etnaviv_obj->pages) {
int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
unpin_user_pages(etnaviv_obj->pages, npages);
kvfree(etnaviv_obj->pages);
}
}
static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
struct vm_area_struct *vma)
{
return -EINVAL;
}
static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
.get_pages = etnaviv_gem_userptr_get_pages,
.release = etnaviv_gem_userptr_release,
.vmap = etnaviv_gem_vmap_impl,
.mmap = etnaviv_gem_userptr_mmap_obj,
};
int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
uintptr_t ptr, u32 size, u32 flags, u32 *handle)
{
struct etnaviv_gem_object *etnaviv_obj;
int ret;
ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED,
&etnaviv_gem_userptr_ops, &etnaviv_obj);
if (ret)
return ret;
lockdep_set_class(&etnaviv_obj->lock, &etnaviv_userptr_lock_class);
etnaviv_obj->userptr.ptr = ptr;
etnaviv_obj->userptr.mm = current->mm;
etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
/* drop reference from allocate - handle holds it now */
drm_gem_object_put(&etnaviv_obj->base);
return ret;
}