![Eric Anholt](/assets/img/avatar_default.png)
It's a pretty direct port of what I did for v3d. Signed-off-by: Eric Anholt <eric@anholt.net> Link: https://patchwork.freedesktop.org/patch/msgid/20190401222635.25013-8-eric@anholt.net Reviewed-and-tested-by: Qiang Yu <yuq825@gmail.com>
350 lines
7.5 KiB
C
350 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR MIT
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/* Copyright 2017-2019 Qiang Yu <yuq825@gmail.com> */
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#include <linux/mm.h>
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#include <linux/sync_file.h>
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#include <linux/pfn_t.h>
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#include <drm/drm_file.h>
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#include <drm/drm_syncobj.h>
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#include <drm/drm_utils.h>
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#include <drm/lima_drm.h>
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#include "lima_drv.h"
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#include "lima_gem.h"
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#include "lima_gem_prime.h"
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#include "lima_vm.h"
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#include "lima_object.h"
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int lima_gem_create_handle(struct drm_device *dev, struct drm_file *file,
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u32 size, u32 flags, u32 *handle)
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{
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int err;
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struct lima_bo *bo;
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struct lima_device *ldev = to_lima_dev(dev);
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bo = lima_bo_create(ldev, size, flags, NULL, NULL);
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if (IS_ERR(bo))
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return PTR_ERR(bo);
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err = drm_gem_handle_create(file, &bo->gem, handle);
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/* drop reference from allocate - handle holds it now */
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drm_gem_object_put_unlocked(&bo->gem);
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return err;
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}
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void lima_gem_free_object(struct drm_gem_object *obj)
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{
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struct lima_bo *bo = to_lima_bo(obj);
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if (!list_empty(&bo->va))
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dev_err(obj->dev->dev, "lima gem free bo still has va\n");
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lima_bo_destroy(bo);
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}
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int lima_gem_object_open(struct drm_gem_object *obj, struct drm_file *file)
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{
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struct lima_bo *bo = to_lima_bo(obj);
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struct lima_drm_priv *priv = to_lima_drm_priv(file);
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struct lima_vm *vm = priv->vm;
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return lima_vm_bo_add(vm, bo, true);
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}
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void lima_gem_object_close(struct drm_gem_object *obj, struct drm_file *file)
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{
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struct lima_bo *bo = to_lima_bo(obj);
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struct lima_drm_priv *priv = to_lima_drm_priv(file);
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struct lima_vm *vm = priv->vm;
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lima_vm_bo_del(vm, bo);
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}
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int lima_gem_get_info(struct drm_file *file, u32 handle, u32 *va, u64 *offset)
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{
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struct drm_gem_object *obj;
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struct lima_bo *bo;
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struct lima_drm_priv *priv = to_lima_drm_priv(file);
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struct lima_vm *vm = priv->vm;
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int err;
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obj = drm_gem_object_lookup(file, handle);
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if (!obj)
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return -ENOENT;
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bo = to_lima_bo(obj);
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*va = lima_vm_get_va(vm, bo);
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err = drm_gem_create_mmap_offset(obj);
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if (!err)
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*offset = drm_vma_node_offset_addr(&obj->vma_node);
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drm_gem_object_put_unlocked(obj);
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return err;
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}
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static vm_fault_t lima_gem_fault(struct vm_fault *vmf)
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{
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struct vm_area_struct *vma = vmf->vma;
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struct drm_gem_object *obj = vma->vm_private_data;
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struct lima_bo *bo = to_lima_bo(obj);
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pfn_t pfn;
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pgoff_t pgoff;
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/* We don't use vmf->pgoff since that has the fake offset: */
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pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
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pfn = __pfn_to_pfn_t(page_to_pfn(bo->pages[pgoff]), PFN_DEV);
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return vmf_insert_mixed(vma, vmf->address, pfn);
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}
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const struct vm_operations_struct lima_gem_vm_ops = {
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.fault = lima_gem_fault,
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.open = drm_gem_vm_open,
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.close = drm_gem_vm_close,
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};
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void lima_set_vma_flags(struct vm_area_struct *vma)
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{
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pgprot_t prot = vm_get_page_prot(vma->vm_flags);
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vma->vm_flags |= VM_MIXEDMAP;
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vma->vm_flags &= ~VM_PFNMAP;
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vma->vm_page_prot = pgprot_writecombine(prot);
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}
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int lima_gem_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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int ret;
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ret = drm_gem_mmap(filp, vma);
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if (ret)
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return ret;
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lima_set_vma_flags(vma);
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return 0;
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}
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static int lima_gem_sync_bo(struct lima_sched_task *task, struct lima_bo *bo,
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bool write, bool explicit)
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{
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int err = 0;
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if (!write) {
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err = reservation_object_reserve_shared(bo->gem.resv, 1);
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if (err)
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return err;
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}
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/* explicit sync use user passed dep fence */
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if (explicit)
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return 0;
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return drm_gem_fence_array_add_implicit(&task->deps, &bo->gem, write);
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}
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static int lima_gem_lock_bos(struct lima_bo **bos, u32 nr_bos,
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struct ww_acquire_ctx *ctx)
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{
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int i, ret = 0, contended, slow_locked = -1;
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ww_acquire_init(ctx, &reservation_ww_class);
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retry:
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for (i = 0; i < nr_bos; i++) {
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if (i == slow_locked) {
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slow_locked = -1;
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continue;
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}
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ret = ww_mutex_lock_interruptible(&bos[i]->gem.resv->lock, ctx);
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if (ret < 0) {
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contended = i;
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goto err;
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}
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}
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ww_acquire_done(ctx);
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return 0;
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err:
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for (i--; i >= 0; i--)
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ww_mutex_unlock(&bos[i]->gem.resv->lock);
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if (slow_locked >= 0)
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ww_mutex_unlock(&bos[slow_locked]->gem.resv->lock);
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if (ret == -EDEADLK) {
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/* we lost out in a seqno race, lock and retry.. */
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ret = ww_mutex_lock_slow_interruptible(
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&bos[contended]->gem.resv->lock, ctx);
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if (!ret) {
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slow_locked = contended;
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goto retry;
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}
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}
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ww_acquire_fini(ctx);
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return ret;
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}
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static void lima_gem_unlock_bos(struct lima_bo **bos, u32 nr_bos,
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struct ww_acquire_ctx *ctx)
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{
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int i;
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for (i = 0; i < nr_bos; i++)
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ww_mutex_unlock(&bos[i]->gem.resv->lock);
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ww_acquire_fini(ctx);
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}
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static int lima_gem_add_deps(struct drm_file *file, struct lima_submit *submit)
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{
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int i, err;
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for (i = 0; i < ARRAY_SIZE(submit->in_sync); i++) {
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struct dma_fence *fence = NULL;
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if (!submit->in_sync[i])
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continue;
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err = drm_syncobj_find_fence(file, submit->in_sync[i],
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0, 0, &fence);
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if (err)
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return err;
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err = drm_gem_fence_array_add(&submit->task->deps, fence);
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if (err) {
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dma_fence_put(fence);
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return err;
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}
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}
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return 0;
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}
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int lima_gem_submit(struct drm_file *file, struct lima_submit *submit)
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{
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int i, err = 0;
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struct ww_acquire_ctx ctx;
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struct lima_drm_priv *priv = to_lima_drm_priv(file);
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struct lima_vm *vm = priv->vm;
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struct drm_syncobj *out_sync = NULL;
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struct dma_fence *fence;
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struct lima_bo **bos = submit->lbos;
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if (submit->out_sync) {
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out_sync = drm_syncobj_find(file, submit->out_sync);
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if (!out_sync)
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return -ENOENT;
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}
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for (i = 0; i < submit->nr_bos; i++) {
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struct drm_gem_object *obj;
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struct lima_bo *bo;
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obj = drm_gem_object_lookup(file, submit->bos[i].handle);
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if (!obj) {
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err = -ENOENT;
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goto err_out0;
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}
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bo = to_lima_bo(obj);
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/* increase refcnt of gpu va map to prevent unmapped when executing,
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* will be decreased when task done
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*/
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err = lima_vm_bo_add(vm, bo, false);
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if (err) {
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drm_gem_object_put_unlocked(obj);
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goto err_out0;
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}
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bos[i] = bo;
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}
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err = lima_gem_lock_bos(bos, submit->nr_bos, &ctx);
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if (err)
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goto err_out0;
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err = lima_sched_task_init(
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submit->task, submit->ctx->context + submit->pipe,
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bos, submit->nr_bos, vm);
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if (err)
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goto err_out1;
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err = lima_gem_add_deps(file, submit);
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if (err)
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goto err_out2;
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for (i = 0; i < submit->nr_bos; i++) {
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err = lima_gem_sync_bo(
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submit->task, bos[i],
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submit->bos[i].flags & LIMA_SUBMIT_BO_WRITE,
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submit->flags & LIMA_SUBMIT_FLAG_EXPLICIT_FENCE);
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if (err)
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goto err_out2;
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}
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fence = lima_sched_context_queue_task(
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submit->ctx->context + submit->pipe, submit->task);
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for (i = 0; i < submit->nr_bos; i++) {
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if (submit->bos[i].flags & LIMA_SUBMIT_BO_WRITE)
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reservation_object_add_excl_fence(bos[i]->gem.resv, fence);
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else
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reservation_object_add_shared_fence(bos[i]->gem.resv, fence);
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}
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lima_gem_unlock_bos(bos, submit->nr_bos, &ctx);
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for (i = 0; i < submit->nr_bos; i++)
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drm_gem_object_put_unlocked(&bos[i]->gem);
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if (out_sync) {
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drm_syncobj_replace_fence(out_sync, fence);
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drm_syncobj_put(out_sync);
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}
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dma_fence_put(fence);
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return 0;
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err_out2:
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lima_sched_task_fini(submit->task);
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err_out1:
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lima_gem_unlock_bos(bos, submit->nr_bos, &ctx);
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err_out0:
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for (i = 0; i < submit->nr_bos; i++) {
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if (!bos[i])
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break;
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lima_vm_bo_del(vm, bos[i]);
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drm_gem_object_put_unlocked(&bos[i]->gem);
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}
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if (out_sync)
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drm_syncobj_put(out_sync);
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return err;
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}
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int lima_gem_wait(struct drm_file *file, u32 handle, u32 op, s64 timeout_ns)
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{
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bool write = op & LIMA_GEM_WAIT_WRITE;
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long ret, timeout;
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if (!op)
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return 0;
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timeout = drm_timeout_abs_to_jiffies(timeout_ns);
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ret = drm_gem_reservation_object_wait(file, handle, write, timeout);
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if (ret == 0)
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ret = timeout ? -ETIMEDOUT : -EBUSY;
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return ret;
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}
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