// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2013 Red Hat
* Author: Rob Clark <[email protected]>
*/
#include <linux/dma-map-ops.h>
#include <linux/vmalloc.h>
#include <linux/spinlock.h>
#include <linux/shmem_fs.h>
#include <linux/dma-buf.h>
#include <linux/pfn_t.h>
#include <drm/drm_prime.h>
#include <drm/drm_file.h>
#include <trace/events/gpu_mem.h>
#include "msm_drv.h"
#include "msm_fence.h"
#include "msm_gem.h"
#include "msm_gpu.h"
#include "msm_mmu.h"
static dma_addr_t physaddr(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct msm_drm_private *priv = obj->dev->dev_private;
return (((dma_addr_t)msm_obj->vram_node->start) << PAGE_SHIFT) +
priv->vram.paddr;
}
static bool use_pages(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
return !msm_obj->vram_node;
}
static void update_device_mem(struct msm_drm_private *priv, ssize_t size)
{
uint64_t total_mem = atomic64_add_return(size, &priv->total_mem);
trace_gpu_mem_total(0, 0, total_mem);
}
static void update_ctx_mem(struct drm_file *file, ssize_t size)
{
struct msm_file_private *ctx = file->driver_priv;
uint64_t ctx_mem = atomic64_add_return(size, &ctx->ctx_mem);
rcu_read_lock(); /* Locks file->pid! */
trace_gpu_mem_total(0, pid_nr(rcu_dereference(file->pid)), ctx_mem);
rcu_read_unlock();
}
static int msm_gem_open(struct drm_gem_object *obj, struct drm_file *file)
{
update_ctx_mem(file, obj->size);
return 0;
}
static void msm_gem_close(struct drm_gem_object *obj, struct drm_file *file)
{
update_ctx_mem(file, -obj->size);
}
/*
* Cache sync.. this is a bit over-complicated, to fit dma-mapping
* API. Really GPU cache is out of scope here (handled on cmdstream)
* and all we need to do is invalidate newly allocated pages before
* mapping to CPU as uncached/writecombine.
*
* On top of this, we have the added headache, that depending on
* display generation, the display's iommu may be wired up to either
* the toplevel drm device (mdss), or to the mdp sub-node, meaning
* that here we either have dma-direct or iommu ops.
*
* Let this be a cautionary tail of abstraction gone wrong.
*/
static void sync_for_device(struct msm_gem_object *msm_obj)
{
struct device *dev = msm_obj->base.dev->dev;
dma_map_sgtable(dev, msm_obj->sgt, DMA_BIDIRECTIONAL, 0);
}
static void sync_for_cpu(struct msm_gem_object *msm_obj)
{
struct device *dev = msm_obj->base.dev->dev;
dma_unmap_sgtable(dev, msm_obj->sgt, DMA_BIDIRECTIONAL, 0);
}
static void update_lru_active(struct drm_gem_object *obj)
{
struct msm_drm_private *priv = obj->dev->dev_private;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
GEM_WARN_ON(!msm_obj->pages);
if (msm_obj->pin_count) {
drm_gem_lru_move_tail_locked(&priv->lru.pinned, obj);
} else if (msm_obj->madv == MSM_MADV_WILLNEED) {
drm_gem_lru_move_tail_locked(&priv->lru.willneed, obj);
} else {
GEM_WARN_ON(msm_obj->madv != MSM_MADV_DONTNEED);
drm_gem_lru_move_tail_locked(&priv->lru.dontneed, obj);
}
}
static void update_lru_locked(struct drm_gem_object *obj)
{
struct msm_drm_private *priv = obj->dev->dev_private;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
msm_gem_assert_locked(&msm_obj->base);
if (!msm_obj->pages) {
GEM_WARN_ON(msm_obj->pin_count);
drm_gem_lru_move_tail_locked(&priv->lru.unbacked, obj);
} else {
update_lru_active(obj);
}
}
static void update_lru(struct drm_gem_object *obj)
{
struct msm_drm_private *priv = obj->dev->dev_private;
mutex_lock(&priv->lru.lock);
update_lru_locked(obj);
mutex_unlock(&priv->lru.lock);
}
/* allocate pages from VRAM carveout, used when no IOMMU: */
static struct page **get_pages_vram(struct drm_gem_object *obj, int npages)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct msm_drm_private *priv = obj->dev->dev_private;
dma_addr_t paddr;
struct page **p;
int ret, i;
p = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
if (!p)
return ERR_PTR(-ENOMEM);
spin_lock(&priv->vram.lock);
ret = drm_mm_insert_node(&priv->vram.mm, msm_obj->vram_node, npages);
spin_unlock(&priv->vram.lock);
if (ret) {
kvfree(p);
return ERR_PTR(ret);
}
paddr = physaddr(obj);
for (i = 0; i < npages; i++) {
p[i] = pfn_to_page(__phys_to_pfn(paddr));
paddr += PAGE_SIZE;
}
return p;
}
static struct page **get_pages(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
msm_gem_assert_locked(obj);
if (!msm_obj->pages) {
struct drm_device *dev = obj->dev;
struct page **p;
int npages = obj->size >> PAGE_SHIFT;
if (use_pages(obj))
p = drm_gem_get_pages(obj);
else
p = get_pages_vram(obj, npages);
if (IS_ERR(p)) {
DRM_DEV_ERROR(dev->dev, "could not get pages: %ld\n",
PTR_ERR(p));
return p;
}
update_device_mem(dev->dev_private, obj->size);
msm_obj->pages = p;
msm_obj->sgt = drm_prime_pages_to_sg(obj->dev, p, npages);
if (IS_ERR(msm_obj->sgt)) {
void *ptr = ERR_CAST(msm_obj->sgt);
DRM_DEV_ERROR(dev->dev, "failed to allocate sgt\n");
msm_obj->sgt = NULL;
return ptr;
}
/* For non-cached buffers, ensure the new pages are clean
* because display controller, GPU, etc. are not coherent:
*/
if (msm_obj->flags & MSM_BO_WC)
sync_for_device(msm_obj);
update_lru(obj);
}
return msm_obj->pages;
}
static void put_pages_vram(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct msm_drm_private *priv = obj->dev->dev_private;
spin_lock(&priv->vram.lock);
drm_mm_remove_node(msm_obj->vram_node);
spin_unlock(&priv->vram.lock);
kvfree(msm_obj->pages);
}
static void put_pages(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
if (msm_obj->pages) {
if (msm_obj->sgt) {
/* For non-cached buffers, ensure the new
* pages are clean because display controller,
* GPU, etc. are not coherent:
*/
if (msm_obj->flags & MSM_BO_WC)
sync_for_cpu(msm_obj);
sg_free_table(msm_obj->sgt);
kfree(msm_obj->sgt);
msm_obj->sgt = NULL;
}
update_device_mem(obj->dev->dev_private, -obj->size);
if (use_pages(obj))
drm_gem_put_pages(obj, msm_obj->pages, true, false);
else
put_pages_vram(obj);
msm_obj->pages = NULL;
update_lru(obj);
}
}
static struct page **msm_gem_get_pages_locked(struct drm_gem_object *obj,
unsigned madv)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
msm_gem_assert_locked(obj);
if (msm_obj->madv > madv) {
DRM_DEV_DEBUG_DRIVER(obj->dev->dev, "Invalid madv state: %u vs %u\n",
msm_obj->madv, madv);
return ERR_PTR(-EBUSY);
}
return get_pages(obj);
}
/*
* Update the pin count of the object, call under lru.lock
*/
void msm_gem_pin_obj_locked(struct drm_gem_object *obj)
{
struct msm_drm_private *priv = obj->dev->dev_private;
msm_gem_assert_locked(obj);
to_msm_bo(obj)->pin_count++;
drm_gem_lru_move_tail_locked(&priv->lru.pinned, obj);
}
static void pin_obj_locked(struct drm_gem_object *obj)
{
struct msm_drm_private *priv = obj->dev->dev_private;
mutex_lock(&priv->lru.lock);
msm_gem_pin_obj_locked(obj);
mutex_unlock(&priv->lru.lock);
}
struct page **msm_gem_pin_pages_locked(struct drm_gem_object *obj)
{
struct page **p;
msm_gem_assert_locked(obj);
p = msm_gem_get_pages_locked(obj, MSM_MADV_WILLNEED);
if (!IS_ERR(p))
pin_obj_locked(obj);
return p;
}
void msm_gem_unpin_pages_locked(struct drm_gem_object *obj)
{
msm_gem_assert_locked(obj);
msm_gem_unpin_locked(obj);
}
static pgprot_t msm_gem_pgprot(struct msm_gem_object *msm_obj, pgprot_t prot)
{
if (msm_obj->flags & MSM_BO_WC)
return pgprot_writecombine(prot);
return prot;
}
static vm_fault_t msm_gem_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct drm_gem_object *obj = vma->vm_private_data;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct page **pages;
unsigned long pfn;
pgoff_t pgoff;
int err;
vm_fault_t ret;
/*
* vm_ops.open/drm_gem_mmap_obj and close get and put
* a reference on obj. So, we dont need to hold one here.
*/
err = msm_gem_lock_interruptible(obj);
if (err) {
ret = VM_FAULT_NOPAGE;
goto out;
}
if (GEM_WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED)) {
msm_gem_unlock(obj);
return VM_FAULT_SIGBUS;
}
/* make sure we have pages attached now */
pages = get_pages(obj);
if (IS_ERR(pages)) {
ret = vmf_error(PTR_ERR(pages));
goto out_unlock;
}
/* We don't use vmf->pgoff since that has the fake offset: */
pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
pfn = page_to_pfn(pages[pgoff]);
VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
pfn, pfn << PAGE_SHIFT);
ret = vmf_insert_pfn(vma, vmf->address, pfn);
out_unlock:
msm_gem_unlock(obj);
out:
return ret;
}
/** get mmap offset */
static uint64_t mmap_offset(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
int ret;
msm_gem_assert_locked(obj);
/* Make it mmapable */
ret = drm_gem_create_mmap_offset(obj);
if (ret) {
DRM_DEV_ERROR(dev->dev, "could not allocate mmap offset\n");
return 0;
}
return drm_vma_node_offset_addr(&obj->vma_node);
}
uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj)
{
uint64_t offset;
msm_gem_lock(obj);
offset = mmap_offset(obj);
msm_gem_unlock(obj);
return offset;
}
static struct msm_gem_vma *add_vma(struct drm_gem_object *obj,
struct msm_gem_address_space *aspace)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct msm_gem_vma *vma;
msm_gem_assert_locked(obj);
vma = msm_gem_vma_new(aspace);
if (!vma)
return ERR_PTR(-ENOMEM);
list_add_tail(&vma->list, &msm_obj->vmas);
return vma;
}
static struct msm_gem_vma *lookup_vma(struct drm_gem_object *obj,
struct msm_gem_address_space *aspace)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct msm_gem_vma *vma;
msm_gem_assert_locked(obj);
list_for_each_entry(vma, &msm_obj->vmas, list) {
if (vma->aspace == aspace)
return vma;
}
return NULL;
}
static void del_vma(struct msm_gem_vma *vma)
{
if (!vma)
return;
list_del(&vma->list);
kfree(vma);
}
/*
* If close is true, this also closes the VMA (releasing the allocated
* iova range) in addition to removing the iommu mapping. In the eviction
* case (!close), we keep the iova allocated, but only remove the iommu
* mapping.
*/
static void
put_iova_spaces(struct drm_gem_object *obj, bool close)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct msm_gem_vma *vma;
msm_gem_assert_locked(obj);
list_for_each_entry(vma, &msm_obj->vmas, list) {
if (vma->aspace) {
msm_gem_vma_purge(vma);
if (close)
msm_gem_vma_close(vma);
}
}
}
/* Called with msm_obj locked */
static void
put_iova_vmas(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct msm_gem_vma *vma, *tmp;
msm_gem_assert_locked(obj);
list_for_each_entry_safe(vma, tmp, &msm_obj->vmas, list) {
del_vma(vma);
}
}
static struct msm_gem_vma *get_vma_locked(struct drm_gem_object *obj,
struct msm_gem_address_space *aspace,
u64 range_start, u64 range_end)
{
struct msm_gem_vma *vma;
msm_gem_assert_locked(obj);
vma = lookup_vma(obj, aspace);
if (!vma) {
int ret;
vma = add_vma(obj, aspace);
if (IS_ERR(vma))
return vma;
ret = msm_gem_vma_init(vma, obj->size,
range_start, range_end);
if (ret) {
del_vma(vma);
return ERR_PTR(ret);
}
} else {
GEM_WARN_ON(vma->iova < range_start);
GEM_WARN_ON((vma->iova + obj->size) > range_end);
}
return vma;
}
int msm_gem_pin_vma_locked(struct drm_gem_object *obj, struct msm_gem_vma *vma)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct page **pages;
int prot = IOMMU_READ;
if (!(msm_obj->flags & MSM_BO_GPU_READONLY))
prot |= IOMMU_WRITE;
if (msm_obj->flags & MSM_BO_MAP_PRIV)
prot |= IOMMU_PRIV;
if (msm_obj->flags & MSM_BO_CACHED_COHERENT)
prot |= IOMMU_CACHE;
msm_gem_assert_locked(obj);
pages = msm_gem_get_pages_locked(obj, MSM_MADV_WILLNEED);
if (IS_ERR(pages))
return PTR_ERR(pages);
return msm_gem_vma_map(vma, prot, msm_obj->sgt, obj->size);
}
void msm_gem_unpin_locked(struct drm_gem_object *obj)
{
struct msm_drm_private *priv = obj->dev->dev_private;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
msm_gem_assert_locked(obj);
mutex_lock(&priv->lru.lock);
msm_obj->pin_count--;
GEM_WARN_ON(msm_obj->pin_count < 0);
update_lru_locked(obj);
mutex_unlock(&priv->lru.lock);
}
/* Special unpin path for use in fence-signaling path, avoiding the need
* to hold the obj lock by only depending on things that a protected by
* the LRU lock. In particular we know that that we already have backing
* and and that the object's dma_resv has the fence for the current
* submit/job which will prevent us racing against page eviction.
*/
void msm_gem_unpin_active(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
msm_obj->pin_count--;
GEM_WARN_ON(msm_obj->pin_count < 0);
update_lru_active(obj);
}
struct msm_gem_vma *msm_gem_get_vma_locked(struct drm_gem_object *obj,
struct msm_gem_address_space *aspace)
{
return get_vma_locked(obj, aspace, 0, U64_MAX);
}
static int get_and_pin_iova_range_locked(struct drm_gem_object *obj,
struct msm_gem_address_space *aspace, uint64_t *iova,
u64 range_start, u64 range_end)
{
struct msm_gem_vma *vma;
int ret;
msm_gem_assert_locked(obj);
vma = get_vma_locked(obj, aspace, range_start, range_end);
if (IS_ERR(vma))
return PTR_ERR(vma);
ret = msm_gem_pin_vma_locked(obj, vma);
if (!ret) {
*iova = vma->iova;
pin_obj_locked(obj);
}
return ret;
}
/*
* get iova and pin it. Should have a matching put
* limits iova to specified range (in pages)
*/
int msm_gem_get_and_pin_iova_range(struct drm_gem_object *obj,
struct msm_gem_address_space *aspace, uint64_t *iova,
u64 range_start, u64 range_end)
{
int ret;
msm_gem_lock(obj);
ret = get_and_pin_iova_range_locked(obj, aspace, iova, range_start, range_end);
msm_gem_unlock(obj);
return ret;
}
/* get iova and pin it. Should have a matching put */
int msm_gem_get_and_pin_iova(struct drm_gem_object *obj,
struct msm_gem_address_space *aspace, uint64_t *iova)
{
return msm_gem_get_and_pin_iova_range(obj, aspace, iova, 0, U64_MAX);
}
/*
* Get an iova but don't pin it. Doesn't need a put because iovas are currently
* valid for the life of the object
*/
int msm_gem_get_iova(struct drm_gem_object *obj,
struct msm_gem_address_space *aspace, uint64_t *iova)
{
struct msm_gem_vma *vma;
int ret = 0;
msm_gem_lock(obj);
vma = get_vma_locked(obj, aspace, 0, U64_MAX);
if (IS_ERR(vma)) {
ret = PTR_ERR(vma);
} else {
*iova = vma->iova;
}
msm_gem_unlock(obj);
return ret;
}
static int clear_iova(struct drm_gem_object *obj,
struct msm_gem_address_space *aspace)
{
struct msm_gem_vma *vma = lookup_vma(obj, aspace);
if (!vma)
return 0;
msm_gem_vma_purge(vma);
msm_gem_vma_close(vma);
del_vma(vma);
return 0;
}
/*
* Get the requested iova but don't pin it. Fails if the requested iova is
* not available. Doesn't need a put because iovas are currently valid for
* the life of the object.
*
* Setting an iova of zero will clear the vma.
*/
int msm_gem_set_iova(struct drm_gem_object *obj,
struct msm_gem_address_space *aspace, uint64_t iova)
{
int ret = 0;
msm_gem_lock(obj);
if (!iova) {
ret = clear_iova(obj, aspace);
} else {
struct msm_gem_vma *vma;
vma = get_vma_locked(obj, aspace, iova, iova + obj->size);
if (IS_ERR(vma)) {
ret = PTR_ERR(vma);
} else if (GEM_WARN_ON(vma->iova != iova)) {
clear_iova(obj, aspace);
ret = -EBUSY;
}
}
msm_gem_unlock(obj);
return ret;
}
/*
* Unpin a iova by updating the reference counts. The memory isn't actually
* purged until something else (shrinker, mm_notifier, destroy, etc) decides
* to get rid of it
*/
void msm_gem_unpin_iova(struct drm_gem_object *obj,
struct msm_gem_address_space *aspace)
{
struct msm_gem_vma *vma;
msm_gem_lock(obj);
vma = lookup_vma(obj, aspace);
if (!GEM_WARN_ON(!vma)) {
msm_gem_unpin_locked(obj);
}
msm_gem_unlock(obj);
}
int msm_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
args->pitch = align_pitch(args->width, args->bpp);
args->size = PAGE_ALIGN(args->pitch * args->height);
return msm_gem_new_handle(dev, file, args->size,
MSM_BO_SCANOUT | MSM_BO_WC, &args->handle, "dumb");
}
int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
uint32_t handle, uint64_t *offset)
{
struct drm_gem_object *obj;
int ret = 0;
/* GEM does all our handle to object mapping */
obj = drm_gem_object_lookup(file, handle);
if (obj == NULL) {
ret = -ENOENT;
goto fail;
}
*offset = msm_gem_mmap_offset(obj);
drm_gem_object_put(obj);
fail:
return ret;
}
static void *get_vaddr(struct drm_gem_object *obj, unsigned madv)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct page **pages;
int ret = 0;
msm_gem_assert_locked(obj);
if (obj->import_attach)
return ERR_PTR(-ENODEV);
pages = msm_gem_get_pages_locked(obj, madv);
if (IS_ERR(pages))
return ERR_CAST(pages);
pin_obj_locked(obj);
/* increment vmap_count *before* vmap() call, so shrinker can
* check vmap_count (is_vunmapable()) outside of msm_obj lock.
* This guarantees that we won't try to msm_gem_vunmap() this
* same object from within the vmap() call (while we already
* hold msm_obj lock)
*/
msm_obj->vmap_count++;
if (!msm_obj->vaddr) {
msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
VM_MAP, msm_gem_pgprot(msm_obj, PAGE_KERNEL));
if (msm_obj->vaddr == NULL) {
ret = -ENOMEM;
goto fail;
}
}
return msm_obj->vaddr;
fail:
msm_obj->vmap_count--;
msm_gem_unpin_locked(obj);
return ERR_PTR(ret);
}
void *msm_gem_get_vaddr_locked(struct drm_gem_object *obj)
{
return get_vaddr(obj, MSM_MADV_WILLNEED);
}
void *msm_gem_get_vaddr(struct drm_gem_object *obj)
{
void *ret;
msm_gem_lock(obj);
ret = msm_gem_get_vaddr_locked(obj);
msm_gem_unlock(obj);
return ret;
}
/*
* Don't use this! It is for the very special case of dumping
* submits from GPU hangs or faults, were the bo may already
* be MSM_MADV_DONTNEED, but we know the buffer is still on the
* active list.
*/
void *msm_gem_get_vaddr_active(struct drm_gem_object *obj)
{
return get_vaddr(obj, __MSM_MADV_PURGED);
}
void msm_gem_put_vaddr_locked(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
msm_gem_assert_locked(obj);
GEM_WARN_ON(msm_obj->vmap_count < 1);
msm_obj->vmap_count--;
msm_gem_unpin_locked(obj);
}
void msm_gem_put_vaddr(struct drm_gem_object *obj)
{
msm_gem_lock(obj);
msm_gem_put_vaddr_locked(obj);
msm_gem_unlock(obj);
}
/* Update madvise status, returns true if not purged, else
* false or -errno.
*/
int msm_gem_madvise(struct drm_gem_object *obj, unsigned madv)
{
struct msm_drm_private *priv = obj->dev->dev_private;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
msm_gem_lock(obj);
mutex_lock(&priv->lru.lock);
if (msm_obj->madv != __MSM_MADV_PURGED)
msm_obj->madv = madv;
madv = msm_obj->madv;
/* If the obj is inactive, we might need to move it
* between inactive lists
*/
update_lru_locked(obj);
mutex_unlock(&priv->lru.lock);
msm_gem_unlock(obj);
return (madv != __MSM_MADV_PURGED);
}
void msm_gem_purge(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
struct msm_drm_private *priv = obj->dev->dev_private;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
msm_gem_assert_locked(obj);
GEM_WARN_ON(!is_purgeable(msm_obj));
/* Get rid of any iommu mapping(s): */
put_iova_spaces(obj, true);
msm_gem_vunmap(obj);
drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping);
put_pages(obj);
put_iova_vmas(obj);
mutex_lock(&priv->lru.lock);
/* A one-way transition: */
msm_obj->madv = __MSM_MADV_PURGED;
mutex_unlock(&priv->lru.lock);
drm_gem_free_mmap_offset(obj);
/* Our goal here is to return as much of the memory as
* is possible back to the system as we are called from OOM.
* To do this we must instruct the shmfs to drop all of its
* backing pages, *now*.
*/
shmem_truncate_range(file_inode(obj->filp), 0, (loff_t)-1);
invalidate_mapping_pages(file_inode(obj->filp)->i_mapping,
0, (loff_t)-1);
}
/*
* Unpin the backing pages and make them available to be swapped out.
*/
void msm_gem_evict(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
msm_gem_assert_locked(obj);
GEM_WARN_ON(is_unevictable(msm_obj));
/* Get rid of any iommu mapping(s): */
put_iova_spaces(obj, false);
drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping);
put_pages(obj);
}
void msm_gem_vunmap(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
msm_gem_assert_locked(obj);
if (!msm_obj->vaddr || GEM_WARN_ON(!is_vunmapable(msm_obj)))
return;
vunmap(msm_obj->vaddr);
msm_obj->vaddr = NULL;
}
bool msm_gem_active(struct drm_gem_object *obj)
{
msm_gem_assert_locked(obj);
if (to_msm_bo(obj)->pin_count)
return true;
return !dma_resv_test_signaled(obj->resv, dma_resv_usage_rw(true));
}
int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout)
{
bool write = !!(op & MSM_PREP_WRITE);
unsigned long remain =
op & MSM_PREP_NOSYNC ? 0 : timeout_to_jiffies(timeout);
long ret;
if (op & MSM_PREP_BOOST) {
dma_resv_set_deadline(obj->resv, dma_resv_usage_rw(write),
ktime_get());
}
ret = dma_resv_wait_timeout(obj->resv, dma_resv_usage_rw(write),
true, remain);
if (ret == 0)
return remain == 0 ? -EBUSY : -ETIMEDOUT;
else if (ret < 0)
return ret;
/* TODO cache maintenance */
return 0;
}
int msm_gem_cpu_fini(struct drm_gem_object *obj)
{
/* TODO cache maintenance */
return 0;
}
#ifdef CONFIG_DEBUG_FS
void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m,
struct msm_gem_stats *stats)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct dma_resv *robj = obj->resv;
struct msm_gem_vma *vma;
uint64_t off = drm_vma_node_start(&obj->vma_node);
const char *madv;
msm_gem_lock(obj);
stats->all.count++;
stats->all.size += obj->size;
if (msm_gem_active(obj)) {
stats->active.count++;
stats->active.size += obj->size;
}
if (msm_obj->pages) {
stats->resident.count++;
stats->resident.size += obj->size;
}
switch (msm_obj->madv) {
case __MSM_MADV_PURGED:
stats->purged.count++;
stats->purged.size += obj->size;
madv = " purged";
break;
case MSM_MADV_DONTNEED:
stats->purgeable.count++;
stats->purgeable.size += obj->size;
madv = " purgeable";
break;
case MSM_MADV_WILLNEED:
default:
madv = "";
break;
}
seq_printf(m, "%08x: %c %2d (%2d) %08llx %p",
msm_obj->flags, msm_gem_active(obj) ? 'A' : 'I',
obj->name, kref_read(&obj->refcount),
off, msm_obj->vaddr);
seq_printf(m, " %08zu %9s %-32s\n", obj->size, madv, msm_obj->name);
if (!list_empty(&msm_obj->vmas)) {
seq_puts(m, " vmas:");
list_for_each_entry(vma, &msm_obj->vmas, list) {
const char *name, *comm;
if (vma->aspace) {
struct msm_gem_address_space *aspace = vma->aspace;
struct task_struct *task =
get_pid_task(aspace->pid, PIDTYPE_PID);
if (task) {
comm = kstrdup(task->comm, GFP_KERNEL);
put_task_struct(task);
} else {
comm = NULL;
}
name = aspace->name;
} else {
name = comm = NULL;
}
seq_printf(m, " [%s%s%s: aspace=%p, %08llx,%s]",
name, comm ? ":" : "", comm ? comm : "",
vma->aspace, vma->iova,
vma->mapped ? "mapped" : "unmapped");
kfree(comm);
}
seq_puts(m, "\n");
}
dma_resv_describe(robj, m);
msm_gem_unlock(obj);
}
void msm_gem_describe_objects(struct list_head *list, struct seq_file *m)
{
struct msm_gem_stats stats = {};
struct msm_gem_object *msm_obj;
seq_puts(m, " flags id ref offset kaddr size madv name\n");
list_for_each_entry(msm_obj, list, node) {
struct drm_gem_object *obj = &msm_obj->base;
seq_puts(m, " ");
msm_gem_describe(obj, m, &stats);
}
seq_printf(m, "Total: %4d objects, %9zu bytes\n",
stats.all.count, stats.all.size);
seq_printf(m, "Active: %4d objects, %9zu bytes\n",
stats.active.count, stats.active.size);
seq_printf(m, "Resident: %4d objects, %9zu bytes\n",
stats.resident.count, stats.resident.size);
seq_printf(m, "Purgeable: %4d objects, %9zu bytes\n",
stats.purgeable.count, stats.purgeable.size);
seq_printf(m, "Purged: %4d objects, %9zu bytes\n",
stats.purged.count, stats.purged.size);
}
#endif
/* don't call directly! Use drm_gem_object_put() */
static void msm_gem_free_object(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct drm_device *dev = obj->dev;
struct msm_drm_private *priv = dev->dev_private;
mutex_lock(&priv->obj_lock);
list_del(&msm_obj->node);
mutex_unlock(&priv->obj_lock);
put_iova_spaces(obj, true);
if (obj->import_attach) {
GEM_WARN_ON(msm_obj->vaddr);
/* Don't drop the pages for imported dmabuf, as they are not
* ours, just free the array we allocated:
*/
kvfree(msm_obj->pages);
put_iova_vmas(obj);
drm_prime_gem_destroy(obj, msm_obj->sgt);
} else {
msm_gem_vunmap(obj);
put_pages(obj);
put_iova_vmas(obj);
}
drm_gem_object_release(obj);
kfree(msm_obj->metadata);
kfree(msm_obj);
}
static int msm_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
vma->vm_page_prot = msm_gem_pgprot(msm_obj, vm_get_page_prot(vma->vm_flags));
return 0;
}
/* convenience method to construct a GEM buffer object, and userspace handle */
int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
uint32_t size, uint32_t flags, uint32_t *handle,
char *name)
{
struct drm_gem_object *obj;
int ret;
obj = msm_gem_new(dev, size, flags);
if (IS_ERR(obj))
return PTR_ERR(obj);
if (name)
msm_gem_object_set_name(obj, "%s", name);
ret = drm_gem_handle_create(file, obj, handle);
/* drop reference from allocate - handle holds it now */
drm_gem_object_put(obj);
return ret;
}
static enum drm_gem_object_status msm_gem_status(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
enum drm_gem_object_status status = 0;
if (msm_obj->pages)
status |= DRM_GEM_OBJECT_RESIDENT;
if (msm_obj->madv == MSM_MADV_DONTNEED)
status |= DRM_GEM_OBJECT_PURGEABLE;
return status;
}
static const struct vm_operations_struct vm_ops = {
.fault = msm_gem_fault,
.open = drm_gem_vm_open,
.close = drm_gem_vm_close,
};
static const struct drm_gem_object_funcs msm_gem_object_funcs = {
.free = msm_gem_free_object,
.open = msm_gem_open,
.close = msm_gem_close,
.pin = msm_gem_prime_pin,
.unpin = msm_gem_prime_unpin,
.get_sg_table = msm_gem_prime_get_sg_table,
.vmap = msm_gem_prime_vmap,
.vunmap = msm_gem_prime_vunmap,
.mmap = msm_gem_object_mmap,
.status = msm_gem_status,
.vm_ops = &vm_ops,
};
static int msm_gem_new_impl(struct drm_device *dev,
uint32_t size, uint32_t flags,
struct drm_gem_object **obj)
{
struct msm_drm_private *priv = dev->dev_private;
struct msm_gem_object *msm_obj;
switch (flags & MSM_BO_CACHE_MASK) {
case MSM_BO_CACHED:
case MSM_BO_WC:
break;
case MSM_BO_CACHED_COHERENT:
if (priv->has_cached_coherent)
break;
fallthrough;
default:
DRM_DEV_DEBUG(dev->dev, "invalid cache flag: %x\n",
(flags & MSM_BO_CACHE_MASK));
return -EINVAL;
}
msm_obj = kzalloc(sizeof(*msm_obj), GFP_KERNEL);
if (!msm_obj)
return -ENOMEM;
msm_obj->flags = flags;
msm_obj->madv = MSM_MADV_WILLNEED;
INIT_LIST_HEAD(&msm_obj->node);
INIT_LIST_HEAD(&msm_obj->vmas);
*obj = &msm_obj->base;
(*obj)->funcs = &msm_gem_object_funcs;
return 0;
}
struct drm_gem_object *msm_gem_new(struct drm_device *dev, uint32_t size, uint32_t flags)
{
struct msm_drm_private *priv = dev->dev_private;
struct msm_gem_object *msm_obj;
struct drm_gem_object *obj = NULL;
bool use_vram = false;
int ret;
size = PAGE_ALIGN(size);
if (!msm_use_mmu(dev))
use_vram = true;
else if ((flags & (MSM_BO_STOLEN | MSM_BO_SCANOUT)) && priv->vram.size)
use_vram = true;
if (GEM_WARN_ON(use_vram && !priv->vram.size))
return ERR_PTR(-EINVAL);
/* Disallow zero sized objects as they make the underlying
* infrastructure grumpy
*/
if (size == 0)
return ERR_PTR(-EINVAL);
ret = msm_gem_new_impl(dev, size, flags, &obj);
if (ret)
return ERR_PTR(ret);
msm_obj = to_msm_bo(obj);
if (use_vram) {
struct msm_gem_vma *vma;
struct page **pages;
drm_gem_private_object_init(dev, obj, size);
msm_gem_lock(obj);
vma = add_vma(obj, NULL);
msm_gem_unlock(obj);
if (IS_ERR(vma)) {
ret = PTR_ERR(vma);
goto fail;
}
to_msm_bo(obj)->vram_node = &vma->node;
msm_gem_lock(obj);
pages = get_pages(obj);
msm_gem_unlock(obj);
if (IS_ERR(pages)) {
ret = PTR_ERR(pages);
goto fail;
}
vma->iova = physaddr(obj);
} else {
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, GFP_HIGHUSER);
}
drm_gem_lru_move_tail(&priv->lru.unbacked, obj);
mutex_lock(&priv->obj_lock);
list_add_tail(&msm_obj->node, &priv->objects);
mutex_unlock(&priv->obj_lock);
ret = drm_gem_create_mmap_offset(obj);
if (ret)
goto fail;
return obj;
fail:
drm_gem_object_put(obj);
return ERR_PTR(ret);
}
struct drm_gem_object *msm_gem_import(struct drm_device *dev,
struct dma_buf *dmabuf, struct sg_table *sgt)
{
struct msm_drm_private *priv = dev->dev_private;
struct msm_gem_object *msm_obj;
struct drm_gem_object *obj;
uint32_t size;
int ret, npages;
/* if we don't have IOMMU, don't bother pretending we can import: */
if (!msm_use_mmu(dev)) {
DRM_DEV_ERROR(dev->dev, "cannot import without IOMMU\n");
return ERR_PTR(-EINVAL);
}
size = PAGE_ALIGN(dmabuf->size);
ret = msm_gem_new_impl(dev, size, MSM_BO_WC, &obj);
if (ret)
return ERR_PTR(ret);
drm_gem_private_object_init(dev, obj, size);
npages = size / PAGE_SIZE;
msm_obj = to_msm_bo(obj);
msm_gem_lock(obj);
msm_obj->sgt = sgt;
msm_obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
if (!msm_obj->pages) {
msm_gem_unlock(obj);
ret = -ENOMEM;
goto fail;
}
ret = drm_prime_sg_to_page_array(sgt, msm_obj->pages, npages);
if (ret) {
msm_gem_unlock(obj);
goto fail;
}
msm_gem_unlock(obj);
drm_gem_lru_move_tail(&priv->lru.pinned, obj);
mutex_lock(&priv->obj_lock);
list_add_tail(&msm_obj->node, &priv->objects);
mutex_unlock(&priv->obj_lock);
ret = drm_gem_create_mmap_offset(obj);
if (ret)
goto fail;
return obj;
fail:
drm_gem_object_put(obj);
return ERR_PTR(ret);
}
void *msm_gem_kernel_new(struct drm_device *dev, uint32_t size,
uint32_t flags, struct msm_gem_address_space *aspace,
struct drm_gem_object **bo, uint64_t *iova)
{
void *vaddr;
struct drm_gem_object *obj = msm_gem_new(dev, size, flags);
int ret;
if (IS_ERR(obj))
return ERR_CAST(obj);
if (iova) {
ret = msm_gem_get_and_pin_iova(obj, aspace, iova);
if (ret)
goto err;
}
vaddr = msm_gem_get_vaddr(obj);
if (IS_ERR(vaddr)) {
msm_gem_unpin_iova(obj, aspace);
ret = PTR_ERR(vaddr);
goto err;
}
if (bo)
*bo = obj;
return vaddr;
err:
drm_gem_object_put(obj);
return ERR_PTR(ret);
}
void msm_gem_kernel_put(struct drm_gem_object *bo,
struct msm_gem_address_space *aspace)
{
if (IS_ERR_OR_NULL(bo))
return;
msm_gem_put_vaddr(bo);
msm_gem_unpin_iova(bo, aspace);
drm_gem_object_put(bo);
}
void msm_gem_object_set_name(struct drm_gem_object *bo, const char *fmt, ...)
{
struct msm_gem_object *msm_obj = to_msm_bo(bo);
va_list ap;
if (!fmt)
return;
va_start(ap, fmt);
vsnprintf(msm_obj->name, sizeof(msm_obj->name), fmt, ap);
va_end(ap);
}