OSCL-LXR linux-6.0.1/​drivers/​gpu/​drm/​msm/​msm_gem.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (C) 2013 Red Hat
  * Author: Rob Clark <robdclark@gmail.com>
  */
 
 #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 "msm_drv.h"
 #include "msm_fence.h"
 #include "msm_gem.h"
 #include "msm_gpu.h"
 #include "msm_mmu.h"
 
 static void update_inactive(struct msm_gem_object *msm_obj);
 
 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;
 }
 
 /*
  * 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);
 }
 
 /* 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);
 
     GEM_WARN_ON(!msm_gem_is_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;
         }
 
         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_inactive(msm_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;
         }
 
         if (use_pages(obj))
             drm_gem_put_pages(obj, msm_obj->pages, true, false);
         else
             put_pages_vram(obj);
 
         msm_obj->pages = NULL;
     }
 }
 
 struct page **msm_gem_get_pages(struct drm_gem_object *obj)
 {
     struct msm_gem_object *msm_obj = to_msm_bo(obj);
     struct page **p;
 
     msm_gem_lock(obj);
 
     if (GEM_WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED)) {
         msm_gem_unlock(obj);
         return ERR_PTR(-EBUSY);
     }
 
     p = get_pages(obj);
 
     if (!IS_ERR(p)) {
         msm_obj->pin_count++;
         update_inactive(msm_obj);
     }
 
     msm_gem_unlock(obj);
     return p;
 }
 
 void msm_gem_put_pages(struct drm_gem_object *obj)
 {
     struct msm_gem_object *msm_obj = to_msm_bo(obj);
 
     msm_gem_lock(obj);
     msm_obj->pin_count--;
     GEM_WARN_ON(msm_obj->pin_count < 0);
     update_inactive(msm_obj);
     msm_gem_unlock(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;
 
     GEM_WARN_ON(!msm_gem_is_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;
 
     GEM_WARN_ON(!msm_gem_is_locked(obj));
 
     vma = kzalloc(sizeof(*vma), GFP_KERNEL);
     if (!vma)
         return ERR_PTR(-ENOMEM);
 
     vma->aspace = aspace;
 
     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;
 
     GEM_WARN_ON(!msm_gem_is_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;
 
     GEM_WARN_ON(!msm_gem_is_locked(obj));
 
     list_for_each_entry(vma, &msm_obj->vmas, list) {
         if (vma->aspace) {
             msm_gem_purge_vma(vma->aspace, vma);
             if (close)
                 msm_gem_close_vma(vma->aspace, 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;
 
     GEM_WARN_ON(!msm_gem_is_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;
 
     GEM_WARN_ON(!msm_gem_is_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_init_vma(aspace, 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 ret, 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;
 
     GEM_WARN_ON(!msm_gem_is_locked(obj));
 
     if (GEM_WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED))
         return -EBUSY;
 
     pages = get_pages(obj);
     if (IS_ERR(pages))
         return PTR_ERR(pages);
 
     ret = msm_gem_map_vma(vma->aspace, vma, prot, msm_obj->sgt, obj->size);
 
     if (!ret)
         msm_obj->pin_count++;
 
     return ret;
 }
 
 void msm_gem_unpin_locked(struct drm_gem_object *obj)
 {
     struct msm_gem_object *msm_obj = to_msm_bo(obj);
 
     GEM_WARN_ON(!msm_gem_is_locked(obj));
 
     msm_obj->pin_count--;
     GEM_WARN_ON(msm_obj->pin_count < 0);
 
     update_inactive(msm_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;
 
     GEM_WARN_ON(!msm_gem_is_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;
 
     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;
 
     if (msm_gem_vma_inuse(vma))
         return -EBUSY;
 
     msm_gem_purge_vma(vma->aspace, vma);
     msm_gem_close_vma(vma->aspace, 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_vma(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);
     int ret = 0;
 
     GEM_WARN_ON(!msm_gem_is_locked(obj));
 
     if (obj->import_attach)
         return ERR_PTR(-ENODEV);
 
     if (GEM_WARN_ON(msm_obj->madv > madv)) {
         DRM_DEV_ERROR(obj->dev->dev, "Invalid madv state: %u vs %u\n",
             msm_obj->madv, madv);
         return ERR_PTR(-EBUSY);
     }
 
     /* 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) {
         struct page **pages = get_pages(obj);
         if (IS_ERR(pages)) {
             ret = PTR_ERR(pages);
             goto fail;
         }
         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;
         }
 
         update_inactive(msm_obj);
     }
 
     return msm_obj->vaddr;
 
 fail:
     msm_obj->vmap_count--;
     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);
 
     GEM_WARN_ON(!msm_gem_is_locked(obj));
     GEM_WARN_ON(msm_obj->vmap_count < 1);
 
     msm_obj->vmap_count--;
 }
 
 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_gem_object *msm_obj = to_msm_bo(obj);
 
     msm_gem_lock(obj);
 
     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
      */
     if (msm_obj->active_count == 0)
         update_inactive(msm_obj);
 
     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_gem_object *msm_obj = to_msm_bo(obj);
 
     GEM_WARN_ON(!msm_gem_is_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);
 
     msm_obj->madv = __MSM_MADV_PURGED;
     update_inactive(msm_obj);
 
     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);
 
     GEM_WARN_ON(!msm_gem_is_locked(obj));
     GEM_WARN_ON(is_unevictable(msm_obj));
     GEM_WARN_ON(!msm_obj->evictable);
     GEM_WARN_ON(msm_obj->active_count);
 
     /* 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);
 
     update_inactive(msm_obj);
 }
 
 void msm_gem_vunmap(struct drm_gem_object *obj)
 {
     struct msm_gem_object *msm_obj = to_msm_bo(obj);
 
     GEM_WARN_ON(!msm_gem_is_locked(obj));
 
     if (!msm_obj->vaddr || GEM_WARN_ON(!is_vunmapable(msm_obj)))
         return;
 
     vunmap(msm_obj->vaddr);
     msm_obj->vaddr = NULL;
 }
 
 void msm_gem_active_get(struct drm_gem_object *obj, struct msm_gpu *gpu)
 {
     struct msm_gem_object *msm_obj = to_msm_bo(obj);
     struct msm_drm_private *priv = obj->dev->dev_private;
 
     might_sleep();
     GEM_WARN_ON(!msm_gem_is_locked(obj));
     GEM_WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED);
     GEM_WARN_ON(msm_obj->dontneed);
 
     if (msm_obj->active_count++ == 0) {
         mutex_lock(&priv->mm_lock);
         if (msm_obj->evictable)
             mark_unevictable(msm_obj);
         list_move_tail(&msm_obj->mm_list, &gpu->active_list);
         mutex_unlock(&priv->mm_lock);
     }
 }
 
 void msm_gem_active_put(struct drm_gem_object *obj)
 {
     struct msm_gem_object *msm_obj = to_msm_bo(obj);
 
     might_sleep();
     GEM_WARN_ON(!msm_gem_is_locked(obj));
 
     if (--msm_obj->active_count == 0) {
         update_inactive(msm_obj);
     }
 }
 
 static void update_inactive(struct msm_gem_object *msm_obj)
 {
     struct msm_drm_private *priv = msm_obj->base.dev->dev_private;
 
     GEM_WARN_ON(!msm_gem_is_locked(&msm_obj->base));
 
     if (msm_obj->active_count != 0)
         return;
 
     mutex_lock(&priv->mm_lock);
 
     if (msm_obj->dontneed)
         mark_unpurgeable(msm_obj);
     if (msm_obj->evictable)
         mark_unevictable(msm_obj);
 
     list_del(&msm_obj->mm_list);
     if ((msm_obj->madv == MSM_MADV_WILLNEED) && msm_obj->sgt) {
         list_add_tail(&msm_obj->mm_list, &priv->inactive_willneed);
         mark_evictable(msm_obj);
     } else if (msm_obj->madv == MSM_MADV_DONTNEED) {
         list_add_tail(&msm_obj->mm_list, &priv->inactive_dontneed);
         mark_purgeable(msm_obj);
     } else {
         GEM_WARN_ON((msm_obj->madv != __MSM_MADV_PURGED) && msm_obj->sgt);
         list_add_tail(&msm_obj->mm_list, &priv->inactive_unpinned);
     }
 
     mutex_unlock(&priv->mm_lock);
 }
 
 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;
 
     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 (is_active(msm_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, is_active(msm_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,inuse=%d]",
                 name, comm ? ":" : "", comm ? comm : "",
                 vma->aspace, vma->iova,
                 vma->mapped ? "mapped" : "unmapped",
                 msm_gem_vma_inuse(vma));
             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);
 
     mutex_lock(&priv->mm_lock);
     if (msm_obj->dontneed)
         mark_unpurgeable(msm_obj);
     list_del(&msm_obj->mm_list);
     mutex_unlock(&priv->mm_lock);
 
     /* object should not be on active list: */
     GEM_WARN_ON(is_active(msm_obj));
 
     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);
 }
 
 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);
 
     vma->vm_flags |= 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 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,
     .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,
     .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;
 
         /* Call chain get_pages() -> update_inactive() tries to
          * access msm_obj->mm_list, but it is not initialized yet.
          * To avoid NULL pointer dereference error, initialize
          * mm_list to be empty.
          */
         INIT_LIST_HEAD(&msm_obj->mm_list);
 
         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);
     }
 
     mutex_lock(&priv->mm_lock);
     list_add_tail(&msm_obj->mm_list, &priv->inactive_unpinned);
     mutex_unlock(&priv->mm_lock);
 
     mutex_lock(&priv->obj_lock);
     list_add_tail(&msm_obj->node, &priv->objects);
     mutex_unlock(&priv->obj_lock);
 
     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);
 
     mutex_lock(&priv->mm_lock);
     list_add_tail(&msm_obj->mm_list, &priv->inactive_unpinned);
     mutex_unlock(&priv->mm_lock);
 
     mutex_lock(&priv->obj_lock);
     list_add_tail(&msm_obj->node, &priv->objects);
     mutex_unlock(&priv->obj_lock);
 
     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);
 }

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