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// SPDX-License-Identifier: GPL-2.0 OR MIT
/* Copyright 2017-2019 Qiang Yu <yuq825@gmail.com> */
#include <linux/mm.h>
#include <linux/sync_file.h>
#include <linux/pfn_t.h>
#include <drm/drm_file.h>
#include <drm/drm_syncobj.h>
#include <drm/drm_utils.h>
#include <drm/lima_drm.h>
#include "lima_drv.h"
#include "lima_gem.h"
#include "lima_gem_prime.h"
#include "lima_vm.h"
#include "lima_object.h"
int lima_gem_create_handle(struct drm_device *dev, struct drm_file *file,
u32 size, u32 flags, u32 *handle)
{
int err;
struct lima_bo *bo;
struct lima_device *ldev = to_lima_dev(dev);
bo = lima_bo_create(ldev, size, flags, NULL);
if (IS_ERR(bo))
return PTR_ERR(bo);
err = drm_gem_handle_create(file, &bo->gem, handle);
/* drop reference from allocate - handle holds it now */
drm_gem_object_put_unlocked(&bo->gem);
return err;
}
void lima_gem_free_object(struct drm_gem_object *obj)
{
struct lima_bo *bo = to_lima_bo(obj);
if (!list_empty(&bo->va))
dev_err(obj->dev->dev, "lima gem free bo still has va\n");
lima_bo_destroy(bo);
}
int lima_gem_object_open(struct drm_gem_object *obj, struct drm_file *file)
{
struct lima_bo *bo = to_lima_bo(obj);
struct lima_drm_priv *priv = to_lima_drm_priv(file);
struct lima_vm *vm = priv->vm;
return lima_vm_bo_add(vm, bo, true);
}
void lima_gem_object_close(struct drm_gem_object *obj, struct drm_file *file)
{
struct lima_bo *bo = to_lima_bo(obj);
struct lima_drm_priv *priv = to_lima_drm_priv(file);
struct lima_vm *vm = priv->vm;
lima_vm_bo_del(vm, bo);
}
int lima_gem_get_info(struct drm_file *file, u32 handle, u32 *va, u64 *offset)
{
struct drm_gem_object *obj;
struct lima_bo *bo;
struct lima_drm_priv *priv = to_lima_drm_priv(file);
struct lima_vm *vm = priv->vm;
int err;
obj = drm_gem_object_lookup(file, handle);
if (!obj)
return -ENOENT;
bo = to_lima_bo(obj);
*va = lima_vm_get_va(vm, bo);
err = drm_gem_create_mmap_offset(obj);
if (!err)
*offset = drm_vma_node_offset_addr(&obj->vma_node);
drm_gem_object_put_unlocked(obj);
return err;
}
static vm_fault_t lima_gem_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct drm_gem_object *obj = vma->vm_private_data;
struct lima_bo *bo = to_lima_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);
}
const struct vm_operations_struct lima_gem_vm_ops = {
.fault = lima_gem_fault,
.open = drm_gem_vm_open,
.close = drm_gem_vm_close,
};
void lima_set_vma_flags(struct vm_area_struct *vma)
{
pgprot_t prot = vm_get_page_prot(vma->vm_flags);
vma->vm_flags |= VM_MIXEDMAP;
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_page_prot = pgprot_writecombine(prot);
}
int lima_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
int ret;
ret = drm_gem_mmap(filp, vma);
if (ret)
return ret;
lima_set_vma_flags(vma);
return 0;
}
static int lima_gem_sync_bo(struct lima_sched_task *task, struct lima_bo *bo,
bool write, bool explicit)
{
int err = 0;
if (!write) {
err = dma_resv_reserve_shared(bo->gem.resv, 1);
if (err)
return err;
}
/* explicit sync use user passed dep fence */
if (explicit)
return 0;
return drm_gem_fence_array_add_implicit(&task->deps, &bo->gem, write);
}
static int lima_gem_lock_bos(struct lima_bo **bos, u32 nr_bos,
struct ww_acquire_ctx *ctx)
{
int i, ret = 0, contended, slow_locked = -1;
ww_acquire_init(ctx, &reservation_ww_class);
retry:
for (i = 0; i < nr_bos; i++) {
if (i == slow_locked) {
slow_locked = -1;
continue;
}
ret = ww_mutex_lock_interruptible(&bos[i]->gem.resv->lock, ctx);
if (ret < 0) {
contended = i;
goto err;
}
}
ww_acquire_done(ctx);
return 0;
err:
for (i--; i >= 0; i--)
ww_mutex_unlock(&bos[i]->gem.resv->lock);
if (slow_locked >= 0)
ww_mutex_unlock(&bos[slow_locked]->gem.resv->lock);
if (ret == -EDEADLK) {
/* we lost out in a seqno race, lock and retry.. */
ret = ww_mutex_lock_slow_interruptible(
&bos[contended]->gem.resv->lock, ctx);
if (!ret) {
slow_locked = contended;
goto retry;
}
}
ww_acquire_fini(ctx);
return ret;
}
static void lima_gem_unlock_bos(struct lima_bo **bos, u32 nr_bos,
struct ww_acquire_ctx *ctx)
{
int i;
for (i = 0; i < nr_bos; i++)
ww_mutex_unlock(&bos[i]->gem.resv->lock);
ww_acquire_fini(ctx);
}
static int lima_gem_add_deps(struct drm_file *file, struct lima_submit *submit)
{
int i, err;
for (i = 0; i < ARRAY_SIZE(submit->in_sync); i++) {
struct dma_fence *fence = NULL;
if (!submit->in_sync[i])
continue;
err = drm_syncobj_find_fence(file, submit->in_sync[i],
0, 0, &fence);
if (err)
return err;
err = drm_gem_fence_array_add(&submit->task->deps, fence);
if (err) {
dma_fence_put(fence);
return err;
}
}
return 0;
}
int lima_gem_submit(struct drm_file *file, struct lima_submit *submit)
{
int i, err = 0;
struct ww_acquire_ctx ctx;
struct lima_drm_priv *priv = to_lima_drm_priv(file);
struct lima_vm *vm = priv->vm;
struct drm_syncobj *out_sync = NULL;
struct dma_fence *fence;
struct lima_bo **bos = submit->lbos;
if (submit->out_sync) {
out_sync = drm_syncobj_find(file, submit->out_sync);
if (!out_sync)
return -ENOENT;
}
for (i = 0; i < submit->nr_bos; i++) {
struct drm_gem_object *obj;
struct lima_bo *bo;
obj = drm_gem_object_lookup(file, submit->bos[i].handle);
if (!obj) {
err = -ENOENT;
goto err_out0;
}
bo = to_lima_bo(obj);
/* increase refcnt of gpu va map to prevent unmapped when executing,
* will be decreased when task done
*/
err = lima_vm_bo_add(vm, bo, false);
if (err) {
drm_gem_object_put_unlocked(obj);
goto err_out0;
}
bos[i] = bo;
}
err = lima_gem_lock_bos(bos, submit->nr_bos, &ctx);
if (err)
goto err_out0;
err = lima_sched_task_init(
submit->task, submit->ctx->context + submit->pipe,
bos, submit->nr_bos, vm);
if (err)
goto err_out1;
err = lima_gem_add_deps(file, submit);
if (err)
goto err_out2;
for (i = 0; i < submit->nr_bos; i++) {
err = lima_gem_sync_bo(
submit->task, bos[i],
submit->bos[i].flags & LIMA_SUBMIT_BO_WRITE,
submit->flags & LIMA_SUBMIT_FLAG_EXPLICIT_FENCE);
if (err)
goto err_out2;
}
fence = lima_sched_context_queue_task(
submit->ctx->context + submit->pipe, submit->task);
for (i = 0; i < submit->nr_bos; i++) {
if (submit->bos[i].flags & LIMA_SUBMIT_BO_WRITE)
dma_resv_add_excl_fence(bos[i]->gem.resv, fence);
else
dma_resv_add_shared_fence(bos[i]->gem.resv, fence);
}
lima_gem_unlock_bos(bos, submit->nr_bos, &ctx);
for (i = 0; i < submit->nr_bos; i++)
drm_gem_object_put_unlocked(&bos[i]->gem);
if (out_sync) {
drm_syncobj_replace_fence(out_sync, fence);
drm_syncobj_put(out_sync);
}
dma_fence_put(fence);
return 0;
err_out2:
lima_sched_task_fini(submit->task);
err_out1:
lima_gem_unlock_bos(bos, submit->nr_bos, &ctx);
err_out0:
for (i = 0; i < submit->nr_bos; i++) {
if (!bos[i])
break;
lima_vm_bo_del(vm, bos[i]);
drm_gem_object_put_unlocked(&bos[i]->gem);
}
if (out_sync)
drm_syncobj_put(out_sync);
return err;
}
int lima_gem_wait(struct drm_file *file, u32 handle, u32 op, s64 timeout_ns)
{
bool write = op & LIMA_GEM_WAIT_WRITE;
long ret, timeout;
if (!op)
return 0;
timeout = drm_timeout_abs_to_jiffies(timeout_ns);
ret = drm_gem_dma_resv_wait(file, handle, write, timeout);
if (ret == -ETIME)
ret = timeout ? -ETIMEDOUT : -EBUSY;
return ret;
}
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