On Wed, Feb 11, 2026 at 2:12 PM Boris Brezillon
<[email protected]> wrote:
>
> While drm_gem_shmem_object does most of the job we need it to do, the
> way sub-resources (pages, sgt, vmap) are handled and their lifetimes
> gets in the way of BO reclaim. There has been attempts to address
> that [1], but in the meantime, new gem_shmem users were introduced
> (accel drivers), and some of them manually free some of these resources.
> This makes things harder to control/sanitize/validate.
>
> Thomas Zimmerman is not a huge fan of enforcing lifetimes of sub-resources
> and forcing gem_shmem users to go through new gem_shmem helpers when they
> need manual control of some sort, and I believe this is a dead end if
> we don't force users to follow some stricter rules through carefully
> designed helpers, because there will always be one user doing crazy things
> with gem_shmem_object internals, which ends up tripping out the common
> helpers when they are called.
>
> The consensus we reached was that we would be better off forking
> gem_shmem in panthor. So here we are, parting ways with gem_shmem. The
> current transition tries to minimize the changes, but there are still
> some aspects that are different, the main one being that we no longer
> have a pages_use_count, and pages stays around until the GEM object is
> destroyed (or when evicted once we've added a shrinker). The sgt also
> no longer retains pages. This is losely based on how msm does things by
> the way.
>
> If there's any interest in sharing code (probably with msm, since the
> panthor shrinker is going to be losely based on the msm implementation),
> we can always change gears and do that once we have everything
> working/merged.
>
> [1]https://patchwork.kernel.org/project/dri-devel/patch/[email protected]/
>
> v2:
> - Fix refcounting
> - Add a _locked suffix to a bunch of functions expecting the resv lock
> to be held
> - Take the lock before releasing resources in panthor_gem_free_object()
>
> v3:
> - Use ERR_CAST() to fix an ERR-ptr deref
> - Add missing resv_[un]lock() around a panthor_gem_backing_unpin_locked()
> call
>
> Signed-off-by: Boris Brezillon <[email protected]>
> ---
> drivers/gpu/drm/panthor/Kconfig | 1 -
> drivers/gpu/drm/panthor/panthor_drv.c | 7 +-
> drivers/gpu/drm/panthor/panthor_fw.c | 16 +-
> drivers/gpu/drm/panthor/panthor_gem.c | 700 ++++++++++++++++++++----
> drivers/gpu/drm/panthor/panthor_gem.h | 62 ++-
> drivers/gpu/drm/panthor/panthor_mmu.c | 48 +-
> drivers/gpu/drm/panthor/panthor_sched.c | 9 +-
> 7 files changed, 669 insertions(+), 174 deletions(-)
>
> diff --git a/drivers/gpu/drm/panthor/Kconfig b/drivers/gpu/drm/panthor/Kconfig
> index 55b40ad07f3b..911e7f4810c3 100644
> --- a/drivers/gpu/drm/panthor/Kconfig
> +++ b/drivers/gpu/drm/panthor/Kconfig
> @@ -8,7 +8,6 @@ config DRM_PANTHOR
> depends on MMU
> select DEVFREQ_GOV_SIMPLE_ONDEMAND
> select DRM_EXEC
> - select DRM_GEM_SHMEM_HELPER
> select DRM_GPUVM
> select DRM_SCHED
> select IOMMU_IO_PGTABLE_LPAE
> diff --git a/drivers/gpu/drm/panthor/panthor_drv.c
> b/drivers/gpu/drm/panthor/panthor_drv.c
> index 52c27a60c84a..90e9abc22d9e 100644
> --- a/drivers/gpu/drm/panthor/panthor_drv.c
> +++ b/drivers/gpu/drm/panthor/panthor_drv.c
> @@ -19,6 +19,7 @@
> #include <drm/drm_debugfs.h>
> #include <drm/drm_drv.h>
> #include <drm/drm_exec.h>
> +#include <drm/drm_file.h>
> #include <drm/drm_ioctl.h>
> #include <drm/drm_print.h>
> #include <drm/drm_syncobj.h>
> @@ -1457,7 +1458,7 @@ static int panthor_ioctl_bo_query_info(struct
> drm_device *ddev, void *data,
> args->create_flags = bo->flags;
>
> args->extra_flags = 0;
> - if (drm_gem_is_imported(&bo->base.base))
> + if (drm_gem_is_imported(&bo->base))
> args->extra_flags |= DRM_PANTHOR_BO_IS_IMPORTED;
>
> drm_gem_object_put(obj);
> @@ -1671,8 +1672,7 @@ static const struct drm_driver panthor_drm_driver = {
> .major = 1,
> .minor = 7,
>
> - .gem_create_object = panthor_gem_create_object,
> - .gem_prime_import_sg_table = drm_gem_shmem_prime_import_sg_table,
> + .gem_prime_import_sg_table = panthor_gem_prime_import_sg_table,
> .gem_prime_import = panthor_gem_prime_import,
> #ifdef CONFIG_DEBUG_FS
> .debugfs_init = panthor_debugfs_init,
> @@ -1822,3 +1822,4 @@ module_exit(panthor_exit);
> MODULE_AUTHOR("Panthor Project Developers");
> MODULE_DESCRIPTION("Panthor DRM Driver");
> MODULE_LICENSE("Dual MIT/GPL");
> +MODULE_IMPORT_NS("DMA_BUF");
> diff --git a/drivers/gpu/drm/panthor/panthor_fw.c
> b/drivers/gpu/drm/panthor/panthor_fw.c
> index 5a904ca64525..9e61d26c3a15 100644
> --- a/drivers/gpu/drm/panthor/panthor_fw.c
> +++ b/drivers/gpu/drm/panthor/panthor_fw.c
> @@ -628,7 +628,6 @@ static int panthor_fw_load_section_entry(struct
> panthor_device *ptdev,
> u32 cache_mode = hdr.flags &
> CSF_FW_BINARY_IFACE_ENTRY_CACHE_MODE_MASK;
> struct panthor_gem_object *bo;
> u32 vm_map_flags = 0;
> - struct sg_table *sgt;
> u64 va = hdr.va.start;
>
> if (!(hdr.flags & CSF_FW_BINARY_IFACE_ENTRY_WR))
> @@ -666,11 +665,12 @@ static int panthor_fw_load_section_entry(struct
> panthor_device *ptdev,
> panthor_fw_init_section_mem(ptdev, section);
>
> bo = to_panthor_bo(section->mem->obj);
> - sgt = drm_gem_shmem_get_pages_sgt(&bo->base);
> - if (IS_ERR(sgt))
> - return PTR_ERR(sgt);
>
> - dma_sync_sgtable_for_device(ptdev->base.dev, sgt,
> DMA_TO_DEVICE);
> + /* An sgt should have been requested when the kernel BO was
> GPU-mapped. */
> + if (drm_WARN_ON_ONCE(&ptdev->base, !bo->dmap.sgt))
> + return -EINVAL;
> +
> + dma_sync_sgtable_for_device(ptdev->base.dev, bo->dmap.sgt,
> DMA_TO_DEVICE);
> }
>
> if (hdr.va.start == CSF_MCU_SHARED_REGION_START)
> @@ -730,8 +730,10 @@ panthor_reload_fw_sections(struct panthor_device *ptdev,
> bool full_reload)
> continue;
>
> panthor_fw_init_section_mem(ptdev, section);
> - sgt =
> drm_gem_shmem_get_pages_sgt(&to_panthor_bo(section->mem->obj)->base);
> - if (!drm_WARN_ON(&ptdev->base, IS_ERR_OR_NULL(sgt)))
> +
> + /* An sgt should have been requested when the kernel BO was
> GPU-mapped. */
> + sgt = to_panthor_bo(section->mem->obj)->dmap.sgt;
> + if (!drm_WARN_ON_ONCE(&ptdev->base, !sgt))
> dma_sync_sgtable_for_device(ptdev->base.dev, sgt,
> DMA_TO_DEVICE);
> }
> }
> diff --git a/drivers/gpu/drm/panthor/panthor_gem.c
> b/drivers/gpu/drm/panthor/panthor_gem.c
> index 4b3d82f001d8..c07ae062c98f 100644
> --- a/drivers/gpu/drm/panthor/panthor_gem.c
> +++ b/drivers/gpu/drm/panthor/panthor_gem.c
> @@ -8,9 +8,11 @@
> #include <linux/dma-mapping.h>
> #include <linux/err.h>
> #include <linux/slab.h>
> +#include <linux/vmalloc.h>
>
> #include <drm/drm_debugfs.h>
> #include <drm/drm_file.h>
> +#include <drm/drm_prime.h>
> #include <drm/drm_print.h>
> #include <drm/panthor_drm.h>
>
> @@ -44,7 +46,7 @@ static void panthor_gem_debugfs_bo_init(struct
> panthor_gem_object *bo)
>
> static void panthor_gem_debugfs_bo_add(struct panthor_gem_object *bo)
> {
> - struct panthor_device *ptdev = container_of(bo->base.base.dev,
> + struct panthor_device *ptdev = container_of(bo->base.dev,
> struct panthor_device,
> base);
>
> bo->debugfs.creator.tgid = current->group_leader->pid;
> @@ -57,7 +59,7 @@ static void panthor_gem_debugfs_bo_add(struct
> panthor_gem_object *bo)
>
> static void panthor_gem_debugfs_bo_rm(struct panthor_gem_object *bo)
> {
> - struct panthor_device *ptdev = container_of(bo->base.base.dev,
> + struct panthor_device *ptdev = container_of(bo->base.dev,
> struct panthor_device,
> base);
>
> if (list_empty(&bo->debugfs.node))
> @@ -80,9 +82,9 @@ static void panthor_gem_debugfs_bo_init(struct
> panthor_gem_object *bo) {}
> #endif
>
> static bool
> -should_map_wc(struct panthor_gem_object *bo, struct panthor_vm *exclusive_vm)
> +should_map_wc(struct panthor_gem_object *bo)
> {
> - struct panthor_device *ptdev = container_of(bo->base.base.dev, struct
> panthor_device, base);
> + struct panthor_device *ptdev = container_of(bo->base.dev, struct
> panthor_device, base);
>
> /* We can't do uncached mappings if the device is coherent,
> * because the zeroing done by the shmem layer at page allocation
> @@ -112,6 +114,211 @@ should_map_wc(struct panthor_gem_object *bo, struct
> panthor_vm *exclusive_vm)
> return true;
> }
>
> +static void
> +panthor_gem_backing_cleanup_locked(struct panthor_gem_object *bo)
> +{
> + dma_resv_assert_held(bo->base.resv);
> +
> + if (!bo->backing.pages)
> + return;
> +
> + drm_gem_put_pages(&bo->base, bo->backing.pages, true, false);
> + bo->backing.pages = NULL;
> +}
> +
> +static int
> +panthor_gem_backing_get_pages_locked(struct panthor_gem_object *bo)
> +{
> + dma_resv_assert_held(bo->base.resv);
> +
> + if (bo->backing.pages)
> + return 0;
> +
> + bo->backing.pages = drm_gem_get_pages(&bo->base);
> + if (IS_ERR(bo->backing.pages)) {
> + drm_dbg_kms(bo->base.dev, "Failed to get pages (%pe)\n",
> + bo->backing.pages);
> + return PTR_ERR(bo->backing.pages);
After this happens once, subsequent get_pages_locked calls will
incorrectly return 0.
> + }
> +
> + return 0;
> +}
> +
> +static int panthor_gem_backing_pin_locked(struct panthor_gem_object *bo)
> +{
> + int ret;
> +
> + dma_resv_assert_held(bo->base.resv);
> + drm_WARN_ON_ONCE(bo->base.dev, drm_gem_is_imported(&bo->base));
> +
> + if (refcount_inc_not_zero(&bo->backing.pin_count))
> + return 0;
> +
> + ret = panthor_gem_backing_get_pages_locked(bo);
> + if (!ret)
> + refcount_set(&bo->backing.pin_count, 1);
> +
> + return ret;
> +}
> +
> +static void panthor_gem_backing_unpin_locked(struct panthor_gem_object *bo)
> +{
> + dma_resv_assert_held(bo->base.resv);
> + drm_WARN_ON_ONCE(bo->base.dev, drm_gem_is_imported(&bo->base));
> +
> + if (refcount_dec_and_test(&bo->backing.pin_count)) {
> + /* We don't release anything when pin_count drops to zero.
> + * Pages stay there until an explicit cleanup is requested.
> + */
> + }
> +}
> +
> +static void
> +panthor_gem_dev_map_cleanup_locked(struct panthor_gem_object *bo)
> +{
> + dma_resv_assert_held(bo->base.resv);
> +
> + if (!bo->dmap.sgt)
> + return;
> +
> + dma_unmap_sgtable(drm_dev_dma_dev(bo->base.dev), bo->dmap.sgt,
> DMA_BIDIRECTIONAL, 0);
> + sg_free_table(bo->dmap.sgt);
> + kfree(bo->dmap.sgt);
> + bo->dmap.sgt = NULL;
> +}
> +
> +static struct sg_table *
> +panthor_gem_dev_map_get_sgt_locked(struct panthor_gem_object *bo)
> +{
> + struct sg_table *sgt;
> + int ret;
> +
> + dma_resv_assert_held(bo->base.resv);
> +
> + if (bo->dmap.sgt)
> + return bo->dmap.sgt;
> +
> + if (drm_WARN_ON_ONCE(bo->base.dev, !bo->backing.pages))
> + return ERR_PTR(-EINVAL);
> +
> + /* Pages stay around after they've been allocated. At least that
> stands
> + * until we add a shrinker.
> + */
> + ret = panthor_gem_backing_get_pages_locked(bo);
> + if (ret)
> + return ERR_PTR(ret);
> +
> + sgt = drm_prime_pages_to_sg(bo->base.dev, bo->backing.pages,
> + bo->base.size >> PAGE_SHIFT);
> + if (IS_ERR(sgt))
> + return sgt;
> +
> + /* Map the pages for use by the h/w. */
> + ret = dma_map_sgtable(drm_dev_dma_dev(bo->base.dev), sgt,
> DMA_BIDIRECTIONAL, 0);
> + if (ret)
> + goto err_free_sgt;
> +
> + bo->dmap.sgt = sgt;
> + return sgt;
> +
> +err_free_sgt:
> + sg_free_table(sgt);
> + kfree(sgt);
> + return ERR_PTR(ret);
> +}
> +
> +struct sg_table *
> +panthor_gem_get_dev_sgt(struct panthor_gem_object *bo)
> +{
> + struct sg_table *sgt;
> +
> + dma_resv_lock(bo->base.resv, NULL);
> + sgt = panthor_gem_dev_map_get_sgt_locked(bo);
> + dma_resv_unlock(bo->base.resv);
> +
> + return sgt;
> +}
> +
> +static void
> +panthor_gem_vmap_cleanup_locked(struct panthor_gem_object *bo)
> +{
> + if (!bo->cmap.vaddr)
> + return;
> +
> + vunmap(bo->cmap.vaddr);
> + bo->cmap.vaddr = NULL;
> + panthor_gem_backing_unpin_locked(bo);
> +}
> +
> +static int
> +panthor_gem_prep_for_cpu_map_locked(struct panthor_gem_object *bo)
> +{
> + if (should_map_wc(bo)) {
> + struct sg_table *sgt;
> +
> + sgt = panthor_gem_dev_map_get_sgt_locked(bo);
> + if (IS_ERR(sgt))
> + return PTR_ERR(sgt);
> + }
> +
> + return 0;
> +}
> +
> +static void *
> +panthor_gem_vmap_get_locked(struct panthor_gem_object *bo)
> +{
> + pgprot_t prot = PAGE_KERNEL;
> + void *vaddr;
> + int ret;
> +
> + dma_resv_assert_held(bo->base.resv);
> +
> + if (drm_WARN_ON_ONCE(bo->base.dev, drm_gem_is_imported(&bo->base)))
> + return ERR_PTR(-EINVAL);
> +
> + if (refcount_inc_not_zero(&bo->cmap.vaddr_use_count)) {
> + drm_WARN_ON_ONCE(bo->base.dev, !bo->cmap.vaddr);
> + return bo->cmap.vaddr;
> + }
> +
> + ret = panthor_gem_backing_pin_locked(bo);
> + if (ret)
> + return ERR_PTR(ret);
> +
> + ret = panthor_gem_prep_for_cpu_map_locked(bo);
> + if (ret)
> + return ERR_PTR(ret);
> +
> + if (should_map_wc(bo))
> + prot = pgprot_writecombine(prot);
> +
> + vaddr = vmap(bo->backing.pages, bo->base.size >> PAGE_SHIFT, VM_MAP,
> prot);
> + if (!vaddr) {
> + ret = -ENOMEM;
> + goto err_unpin;
> + }
> +
> + bo->cmap.vaddr = vaddr;
> + refcount_set(&bo->cmap.vaddr_use_count, 1);
> + return vaddr;
> +
> +err_unpin:
> + panthor_gem_backing_unpin_locked(bo);
> + return ERR_PTR(ret);
> +}
> +
> +static void
> +panthor_gem_vmap_put_locked(struct panthor_gem_object *bo)
> +{
> + dma_resv_assert_held(bo->base.resv);
> +
> + if (drm_WARN_ON_ONCE(bo->base.dev, drm_gem_is_imported(&bo->base)))
> + return;
> +
> + if (refcount_dec_and_test(&bo->cmap.vaddr_use_count))
> + panthor_gem_vmap_cleanup_locked(bo);
> +}
> +
> static void panthor_gem_free_object(struct drm_gem_object *obj)
> {
> struct panthor_gem_object *bo = to_panthor_bo(obj);
> @@ -127,8 +334,19 @@ static void panthor_gem_free_object(struct
> drm_gem_object *obj)
>
> mutex_destroy(&bo->label.lock);
>
> - drm_gem_free_mmap_offset(&bo->base.base);
> - drm_gem_shmem_free(&bo->base);
> + if (drm_gem_is_imported(obj)) {
> + drm_prime_gem_destroy(obj, bo->dmap.sgt);
> + } else {
> + dma_resv_lock(obj->resv, NULL);
> + panthor_gem_vmap_cleanup_locked(bo);
> + panthor_gem_dev_map_cleanup_locked(bo);
> + panthor_gem_backing_cleanup_locked(bo);
> + dma_resv_unlock(obj->resv);
> + }
> +
> + drm_gem_object_release(obj);
> +
> + kfree(bo);
> drm_gem_object_put(vm_root_gem);
> }
>
> @@ -159,15 +377,15 @@ panthor_gem_prime_begin_cpu_access(struct dma_buf
> *dma_buf,
> {
> struct drm_gem_object *obj = dma_buf->priv;
> struct drm_device *dev = obj->dev;
> - struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
> + struct panthor_gem_object *bo = to_panthor_bo(obj);
> struct dma_buf_attachment *attach;
>
> dma_resv_lock(obj->resv, NULL);
> - if (shmem->sgt)
> - dma_sync_sgtable_for_cpu(dev->dev, shmem->sgt, dir);
> + if (bo->dmap.sgt)
> + dma_sync_sgtable_for_cpu(drm_dev_dma_dev(dev), bo->dmap.sgt,
> dir);
>
> - if (shmem->vaddr)
> - invalidate_kernel_vmap_range(shmem->vaddr, shmem->base.size);
> + if (bo->cmap.vaddr)
> + invalidate_kernel_vmap_range(bo->cmap.vaddr, bo->base.size);
>
> list_for_each_entry(attach, &dma_buf->attachments, node) {
> struct sg_table *sgt = attach->priv;
> @@ -186,7 +404,7 @@ panthor_gem_prime_end_cpu_access(struct dma_buf *dma_buf,
> {
> struct drm_gem_object *obj = dma_buf->priv;
> struct drm_device *dev = obj->dev;
> - struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
> + struct panthor_gem_object *bo = to_panthor_bo(obj);
> struct dma_buf_attachment *attach;
>
> dma_resv_lock(obj->resv, NULL);
> @@ -197,11 +415,11 @@ panthor_gem_prime_end_cpu_access(struct dma_buf
> *dma_buf,
> dma_sync_sgtable_for_device(attach->dev, sgt, dir);
> }
>
> - if (shmem->vaddr)
> - flush_kernel_vmap_range(shmem->vaddr, shmem->base.size);
> + if (bo->cmap.vaddr)
> + flush_kernel_vmap_range(bo->cmap.vaddr, bo->base.size);
>
> - if (shmem->sgt)
> - dma_sync_sgtable_for_device(dev->dev, shmem->sgt, dir);
> + if (bo->dmap.sgt)
> + dma_sync_sgtable_for_device(drm_dev_dma_dev(dev),
> bo->dmap.sgt, dir);
>
> dma_resv_unlock(obj->resv);
> return 0;
> @@ -258,53 +476,338 @@ panthor_gem_prime_import(struct drm_device *dev,
> return drm_gem_prime_import(dev, dma_buf);
> }
>
> +static void panthor_gem_print_info(struct drm_printer *p, unsigned int
> indent,
> + const struct drm_gem_object *obj)
> +{
> + const struct panthor_gem_object *bo = to_panthor_bo(obj);
> +
> + if (drm_gem_is_imported(&bo->base))
> + return;
> +
> + drm_printf_indent(p, indent, "resident=%s\n",
> str_true_false(bo->backing.pages));
> + drm_printf_indent(p, indent, "pages_pin_count=%u\n",
> refcount_read(&bo->backing.pin_count));
> + drm_printf_indent(p, indent, "vmap_use_count=%u\n",
> + refcount_read(&bo->cmap.vaddr_use_count));
> + drm_printf_indent(p, indent, "vaddr=%p\n", bo->cmap.vaddr);
> +}
> +
> +static int panthor_gem_pin_locked(struct drm_gem_object *obj)
> +{
> + if (drm_gem_is_imported(obj))
> + return 0;
> +
> + return panthor_gem_backing_pin_locked(to_panthor_bo(obj));
> +}
> +
> +static void panthor_gem_unpin_locked(struct drm_gem_object *obj)
> +{
> + if (!drm_gem_is_imported(obj))
> + panthor_gem_backing_unpin_locked(to_panthor_bo(obj));
> +}
> +
> +int panthor_gem_pin(struct panthor_gem_object *bo)
> +{
> + int ret = 0;
> +
> + if (drm_gem_is_imported(&bo->base))
> + return 0;
> +
> + if (refcount_inc_not_zero(&bo->backing.pin_count))
> + return 0;
> +
> + dma_resv_lock(bo->base.resv, NULL);
> + ret = panthor_gem_backing_pin_locked(bo);
> + dma_resv_unlock(bo->base.resv);
> +
> + return ret;
> +}
> +
> +void panthor_gem_unpin(struct panthor_gem_object *bo)
> +{
> + if (drm_gem_is_imported(&bo->base))
> + return;
> +
> + if (!refcount_dec_not_one(&bo->backing.pin_count)) {
Can we make panthor_gem_{pin,unpin} have the same style? We negate the
test here but not in panthor_gem_pin.
> + dma_resv_lock(bo->base.resv, NULL);
> + panthor_gem_backing_unpin_locked(bo);
> + dma_resv_unlock(bo->base.resv);
> + }
> +}
> +
> +static struct sg_table *panthor_gem_get_sg_table(struct drm_gem_object *obj)
> +{
> + struct panthor_gem_object *bo = to_panthor_bo(obj);
> +
> + drm_WARN_ON_ONCE(obj->dev, drm_gem_is_imported(obj));
> + drm_WARN_ON_ONCE(obj->dev, !bo->backing.pages);
> + drm_WARN_ON_ONCE(obj->dev, !refcount_read(&bo->backing.pin_count));
> +
> + return drm_prime_pages_to_sg(obj->dev, bo->backing.pages, obj->size
> >> PAGE_SHIFT);
> +}
> +
> +static int panthor_gem_vmap_locked(struct drm_gem_object *obj,
> + struct iosys_map *map)
> +{
> + struct panthor_gem_object *bo = to_panthor_bo(obj);
> + void *vaddr;
> +
> + dma_resv_assert_held(obj->resv);
> +
> + if (drm_gem_is_imported(obj))
> + return dma_buf_vmap(obj->import_attach->dmabuf, map);
> +
> + vaddr = panthor_gem_vmap_get_locked(bo);
> + if (IS_ERR(vaddr))
> + return PTR_ERR(vaddr);
> +
> + iosys_map_set_vaddr(map, vaddr);
> + return 0;
> +}
> +
> +static void panthor_gem_vunmap_locked(struct drm_gem_object *obj,
> + struct iosys_map *map)
> +{
> + struct panthor_gem_object *bo = to_panthor_bo(obj);
> +
> + dma_resv_assert_held(obj->resv);
> +
> + if (drm_gem_is_imported(obj)) {
> + dma_buf_vunmap(obj->import_attach->dmabuf, map);
> + } else {
> + drm_WARN_ON_ONCE(obj->dev, bo->cmap.vaddr != map->vaddr);
> + panthor_gem_vmap_put_locked(bo);
> + }
> +}
> +
> +static int panthor_gem_mmap(struct drm_gem_object *obj, struct
> vm_area_struct *vma)
> +{
> + struct panthor_gem_object *bo = to_panthor_bo(obj);
> + int ret;
> +
> + if (drm_gem_is_imported(obj)) {
> + /* Reset both vm_ops and vm_private_data, so we don't end up
> with
> + * vm_ops pointing to our implementation if the dma-buf
> backend
> + * doesn't set those fields.
> + */
> + vma->vm_private_data = NULL;
> + vma->vm_ops = NULL;
> +
> + ret = dma_buf_mmap(obj->dma_buf, vma, 0);
> +
> + /* Drop the reference drm_gem_mmap_obj() acquired.*/
> + if (!ret)
> + drm_gem_object_put(obj);
> +
> + return ret;
> + }
> +
> + if (is_cow_mapping(vma->vm_flags))
> + return -EINVAL;
> +
> + dma_resv_lock(obj->resv, NULL);
> + ret = panthor_gem_backing_get_pages_locked(bo);
> + if (!ret)
> + ret = panthor_gem_prep_for_cpu_map_locked(bo);
> + dma_resv_unlock(obj->resv);
> +
> + if (ret)
> + return ret;
> +
> + vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
> + vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
> + if (should_map_wc(bo))
> + vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
> +
> + return 0;
> +}
> +
> static enum drm_gem_object_status panthor_gem_status(struct drm_gem_object
> *obj)
> {
> struct panthor_gem_object *bo = to_panthor_bo(obj);
> enum drm_gem_object_status res = 0;
>
> - if (drm_gem_is_imported(&bo->base.base) || bo->base.pages)
> + if (drm_gem_is_imported(&bo->base) || bo->backing.pages)
> res |= DRM_GEM_OBJECT_RESIDENT;
>
> return res;
> }
>
> -static const struct drm_gem_object_funcs panthor_gem_funcs = {
> - .free = panthor_gem_free_object,
> - .print_info = drm_gem_shmem_object_print_info,
> - .pin = drm_gem_shmem_object_pin,
> - .unpin = drm_gem_shmem_object_unpin,
> - .get_sg_table = drm_gem_shmem_object_get_sg_table,
> - .vmap = drm_gem_shmem_object_vmap,
> - .vunmap = drm_gem_shmem_object_vunmap,
> - .mmap = drm_gem_shmem_object_mmap,
> - .status = panthor_gem_status,
> - .export = panthor_gem_prime_export,
> - .vm_ops = &drm_gem_shmem_vm_ops,
> +static bool try_map_pmd(struct vm_fault *vmf, unsigned long addr, struct
> page *page)
> +{
> +#ifdef CONFIG_ARCH_SUPPORTS_PMD_PFNMAP
> + unsigned long pfn = page_to_pfn(page);
> + unsigned long paddr = pfn << PAGE_SHIFT;
> + bool aligned = (addr & ~PMD_MASK) == (paddr & ~PMD_MASK);
> +
> + if (aligned &&
> + pmd_none(*vmf->pmd) &&
> + folio_test_pmd_mappable(page_folio(page))) {
> + pfn &= PMD_MASK >> PAGE_SHIFT;
> + if (vmf_insert_pfn_pmd(vmf, pfn, false) == VM_FAULT_NOPAGE)
> + return true;
> + }
> +#endif
> +
> + return false;
> +}
> +
> +static vm_fault_t panthor_gem_fault(struct vm_fault *vmf)
> +{
> + struct vm_area_struct *vma = vmf->vma;
> + struct drm_gem_object *obj = vma->vm_private_data;
> + struct panthor_gem_object *bo = to_panthor_bo(vma->vm_private_data);
> + loff_t num_pages = obj->size >> PAGE_SHIFT;
> + vm_fault_t ret;
> + pgoff_t page_offset;
> + unsigned long pfn;
> +
> + /* Offset to faulty address in the VMA. */
> + page_offset = vmf->pgoff - vma->vm_pgoff;
> +
> + dma_resv_lock(bo->base.resv, NULL);
> +
> + if (page_offset >= num_pages ||
> + drm_WARN_ON_ONCE(obj->dev, !bo->backing.pages)) {
> + ret = VM_FAULT_SIGBUS;
> + goto out;
> + }
> +
> + if (try_map_pmd(vmf, vmf->address, bo->backing.pages[page_offset])) {
> + ret = VM_FAULT_NOPAGE;
> + goto out;
> + }
> +
> + pfn = page_to_pfn(bo->backing.pages[page_offset]);
> + ret = vmf_insert_pfn(vma, vmf->address, pfn);
> +
> + out:
> + dma_resv_unlock(bo->base.resv);
> +
> + return ret;
> +}
> +
> +static void panthor_gem_vm_open(struct vm_area_struct *vma)
> +{
> + struct panthor_gem_object *bo = to_panthor_bo(vma->vm_private_data);
> +
> + drm_WARN_ON(bo->base.dev, drm_gem_is_imported(&bo->base));
> +
> + dma_resv_lock(bo->base.resv, NULL);
> +
> + /* We should have already pinned the pages when the buffer was first
> + * mmap'd, vm_open() just grabs an additional reference for the new
> + * mm the vma is getting copied into (ie. on fork()).
> + */
> + drm_WARN_ON_ONCE(bo->base.dev, !bo->backing.pages);
> +
> + dma_resv_unlock(bo->base.resv);
> +
> + drm_gem_vm_open(vma);
> +}
> +
> +const struct vm_operations_struct panthor_gem_vm_ops = {
> + .fault = panthor_gem_fault,
> + .open = panthor_gem_vm_open,
> + .close = drm_gem_vm_close,
> };
>
> -/**
> - * panthor_gem_create_object - Implementation of driver->gem_create_object.
> - * @ddev: DRM device
> - * @size: Size in bytes of the memory the object will reference
> - *
> - * This lets the GEM helpers allocate object structs for us, and keep
> - * our BO stats correct.
> - */
> -struct drm_gem_object *panthor_gem_create_object(struct drm_device *ddev,
> size_t size)
> -{
> - struct panthor_gem_object *obj;
> +static const struct drm_gem_object_funcs panthor_gem_funcs = {
> + .free = panthor_gem_free_object,
> + .print_info = panthor_gem_print_info,
> + .pin = panthor_gem_pin_locked,
> + .unpin = panthor_gem_unpin_locked,
> + .get_sg_table = panthor_gem_get_sg_table,
> + .vmap = panthor_gem_vmap_locked,
> + .vunmap = panthor_gem_vunmap_locked,
> + .mmap = panthor_gem_mmap,
> + .status = panthor_gem_status,
> + .export = panthor_gem_prime_export,
> + .vm_ops = &panthor_gem_vm_ops,
> +};
>
> - obj = kzalloc(sizeof(*obj), GFP_KERNEL);
> - if (!obj)
> +static struct panthor_gem_object *
> +panthor_gem_alloc_object(uint32_t flags)
> +{
> + struct panthor_gem_object *bo;
> +
> + bo = kzalloc(sizeof(*bo), GFP_KERNEL);
> + if (!bo)
> return ERR_PTR(-ENOMEM);
>
> - obj->base.base.funcs = &panthor_gem_funcs;
> - mutex_init(&obj->label.lock);
> + bo->base.funcs = &panthor_gem_funcs;
> + bo->flags = flags;
> + mutex_init(&bo->label.lock);
> + panthor_gem_debugfs_bo_init(bo);
> + return bo;
> +}
>
> - panthor_gem_debugfs_bo_init(obj);
> +static struct panthor_gem_object *
> +panthor_gem_create(struct drm_device *dev, size_t size, uint32_t flags,
> + struct panthor_vm *exclusive_vm, u32 usage_flags)
> +{
> + struct panthor_gem_object *bo;
> + int ret;
>
> - return &obj->base.base;
> + bo = panthor_gem_alloc_object(flags);
> + if (IS_ERR(bo))
> + return bo;
> +
> + size = PAGE_ALIGN(size);
> + ret = drm_gem_object_init(dev, &bo->base, size);
> + if (ret)
> + goto err_put;
> +
> + /* 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(bo->base.filp->f_mapping,
> + GFP_HIGHUSER | __GFP_RETRY_MAYFAIL |
> __GFP_NOWARN);
> +
> + ret = drm_gem_create_mmap_offset(&bo->base);
> + if (ret)
> + goto err_put;
> +
> + if (exclusive_vm) {
> + bo->exclusive_vm_root_gem = panthor_vm_root_gem(exclusive_vm);
> + drm_gem_object_get(bo->exclusive_vm_root_gem);
> + bo->base.resv = bo->exclusive_vm_root_gem->resv;
> + }
> +
> + panthor_gem_debugfs_set_usage_flags(bo, usage_flags);
> + return bo;
> +
> +err_put:
> + drm_gem_object_put(&bo->base);
> + return ERR_PTR(ret);
> +}
> +
> +struct drm_gem_object *
> +panthor_gem_prime_import_sg_table(struct drm_device *dev,
> + struct dma_buf_attachment *attach,
> + struct sg_table *sgt)
> +{
> + struct panthor_gem_object *bo;
> + int ret;
> +
> + bo = panthor_gem_alloc_object(0);
> + if (IS_ERR(bo))
> + return ERR_CAST(bo);
> +
> + drm_gem_private_object_init(dev, &bo->base, attach->dmabuf->size);
> +
> + ret = drm_gem_create_mmap_offset(&bo->base);
> + if (ret)
> + goto err_put;
> +
> + bo->dmap.sgt = sgt;
> + return &bo->base;
> +
> +err_put:
> + drm_gem_object_put(&bo->base);
> + return ERR_PTR(ret);
> }
>
> /**
> @@ -325,54 +828,22 @@ panthor_gem_create_with_handle(struct drm_file *file,
> u64 *size, u32 flags, u32 *handle)
> {
> int ret;
> - struct drm_gem_shmem_object *shmem;
> struct panthor_gem_object *bo;
>
> - shmem = drm_gem_shmem_create(ddev, *size);
> - if (IS_ERR(shmem))
> - return PTR_ERR(shmem);
> -
> - bo = to_panthor_bo(&shmem->base);
> - bo->flags = flags;
> - bo->base.map_wc = should_map_wc(bo, exclusive_vm);
> -
> - if (exclusive_vm) {
> - bo->exclusive_vm_root_gem = panthor_vm_root_gem(exclusive_vm);
> - drm_gem_object_get(bo->exclusive_vm_root_gem);
> - bo->base.base.resv = bo->exclusive_vm_root_gem->resv;
> - }
> -
> - panthor_gem_debugfs_set_usage_flags(bo, 0);
> -
> - /* If this is a write-combine mapping, we query the sgt to force a CPU
> - * cache flush (dma_map_sgtable() is called when the sgt is created).
> - * This ensures the zero-ing is visible to any uncached mapping
> created
> - * by vmap/mmap.
> - * FIXME: Ideally this should be done when pages are allocated, not at
> - * BO creation time.
> - */
> - if (shmem->map_wc) {
> - struct sg_table *sgt;
> -
> - sgt = drm_gem_shmem_get_pages_sgt(shmem);
> - if (IS_ERR(sgt)) {
> - ret = PTR_ERR(sgt);
> - goto out_put_gem;
> - }
> - }
> + bo = panthor_gem_create(ddev, *size, flags, exclusive_vm, 0);
> + if (IS_ERR(bo))
> + return PTR_ERR(bo);
>
> /*
> * Allocate an id of idr table where the obj is registered
> * and handle has the id what user can see.
> */
> - ret = drm_gem_handle_create(file, &shmem->base, handle);
> + ret = drm_gem_handle_create(file, &bo->base, handle);
> if (!ret)
> - *size = bo->base.base.size;
> + *size = bo->base.size;
>
> -out_put_gem:
> /* drop reference from allocate - handle holds it now. */
> - drm_gem_object_put(&shmem->base);
> -
> + drm_gem_object_put(&bo->base);
> return ret;
> }
>
> @@ -417,18 +888,17 @@ panthor_gem_sync(struct drm_gem_object *obj, u32 type,
> u64 offset, u64 size)
> {
> struct panthor_gem_object *bo = to_panthor_bo(obj);
> - struct drm_gem_shmem_object *shmem = &bo->base;
> - const struct drm_device *dev = shmem->base.dev;
> + struct device *dma_dev = drm_dev_dma_dev(bo->base.dev);
> struct sg_table *sgt;
> struct scatterlist *sgl;
> unsigned int count;
>
> /* Make sure the range is in bounds. */
> - if (offset + size < offset || offset + size > shmem->base.size)
> + if (offset + size < offset || offset + size > bo->base.size)
> return -EINVAL;
>
> /* Disallow CPU-cache maintenance on imported buffers. */
> - if (drm_gem_is_imported(&shmem->base))
> + if (drm_gem_is_imported(&bo->base))
> return -EINVAL;
>
> switch (type) {
> @@ -441,14 +911,14 @@ panthor_gem_sync(struct drm_gem_object *obj, u32 type,
> }
>
> /* Don't bother if it's WC-mapped */
> - if (shmem->map_wc)
> + if (should_map_wc(bo))
> return 0;
>
> /* Nothing to do if the size is zero. */
> if (size == 0)
> return 0;
>
> - sgt = drm_gem_shmem_get_pages_sgt(shmem);
> + sgt = panthor_gem_get_dev_sgt(bo);
> if (IS_ERR(sgt))
> return PTR_ERR(sgt);
>
> @@ -489,9 +959,9 @@ panthor_gem_sync(struct drm_gem_object *obj, u32 type,
> *
> * for the flush+invalidate case.
> */
> - dma_sync_single_for_device(dev->dev, paddr, len,
> DMA_TO_DEVICE);
> + dma_sync_single_for_device(dma_dev, paddr, len,
> DMA_TO_DEVICE);
> if (type ==
> DRM_PANTHOR_BO_SYNC_CPU_CACHE_FLUSH_AND_INVALIDATE)
> - dma_sync_single_for_cpu(dev->dev, paddr, len,
> DMA_FROM_DEVICE);
> + dma_sync_single_for_cpu(dma_dev, paddr, len,
> DMA_FROM_DEVICE);
> }
>
> return 0;
> @@ -541,7 +1011,6 @@ panthor_kernel_bo_create(struct panthor_device *ptdev,
> struct panthor_vm *vm,
> size_t size, u32 bo_flags, u32 vm_map_flags,
> u64 gpu_va, const char *name)
> {
> - struct drm_gem_shmem_object *obj;
> struct panthor_kernel_bo *kbo;
> struct panthor_gem_object *bo;
> u32 debug_flags = PANTHOR_DEBUGFS_GEM_USAGE_FLAG_KERNEL;
> @@ -554,25 +1023,18 @@ panthor_kernel_bo_create(struct panthor_device *ptdev,
> struct panthor_vm *vm,
> if (!kbo)
> return ERR_PTR(-ENOMEM);
>
> - obj = drm_gem_shmem_create(&ptdev->base, size);
> - if (IS_ERR(obj)) {
> - ret = PTR_ERR(obj);
> - goto err_free_bo;
> - }
> -
> - bo = to_panthor_bo(&obj->base);
> - kbo->obj = &obj->base;
> - bo->flags = bo_flags;
> - bo->base.map_wc = should_map_wc(bo, vm);
> - bo->exclusive_vm_root_gem = panthor_vm_root_gem(vm);
> - drm_gem_object_get(bo->exclusive_vm_root_gem);
> - bo->base.base.resv = bo->exclusive_vm_root_gem->resv;
> -
> if (vm == panthor_fw_vm(ptdev))
> debug_flags |= PANTHOR_DEBUGFS_GEM_USAGE_FLAG_FW_MAPPED;
>
> + bo = panthor_gem_create(&ptdev->base, size, bo_flags, vm,
> debug_flags);
> + if (IS_ERR(bo)) {
> + ret = PTR_ERR(bo);
> + goto err_free_kbo;
> + }
> +
> + kbo->obj = &bo->base;
> +
> panthor_gem_kernel_bo_set_label(kbo, name);
> - panthor_gem_debugfs_set_usage_flags(to_panthor_bo(kbo->obj),
> debug_flags);
>
> /* The system and GPU MMU page size might differ, which becomes a
> * problem for FW sections that need to be mapped at explicit address
> @@ -596,9 +1058,9 @@ panthor_kernel_bo_create(struct panthor_device *ptdev,
> struct panthor_vm *vm,
> panthor_vm_free_va(vm, &kbo->va_node);
>
> err_put_obj:
> - drm_gem_object_put(&obj->base);
> + drm_gem_object_put(&bo->base);
>
> -err_free_bo:
> +err_free_kbo:
> kfree(kbo);
> return ERR_PTR(ret);
> }
> @@ -646,7 +1108,7 @@ static void panthor_gem_debugfs_bo_print(struct
> panthor_gem_object *bo,
> struct seq_file *m,
> struct gem_size_totals *totals)
> {
> - unsigned int refcount = kref_read(&bo->base.base.refcount);
> + unsigned int refcount = kref_read(&bo->base.refcount);
> char creator_info[32] = {};
> size_t resident_size;
> u32 gem_usage_flags = bo->debugfs.flags;
> @@ -656,21 +1118,21 @@ static void panthor_gem_debugfs_bo_print(struct
> panthor_gem_object *bo,
> if (!refcount)
> return;
>
> - resident_size = bo->base.pages ? bo->base.base.size : 0;
> + resident_size = bo->backing.pages ? bo->base.size : 0;
>
> snprintf(creator_info, sizeof(creator_info),
> "%s/%d", bo->debugfs.creator.process_name,
> bo->debugfs.creator.tgid);
> seq_printf(m, "%-32s%-16d%-16d%-16zd%-16zd0x%-16lx",
> creator_info,
> - bo->base.base.name,
> + bo->base.name,
> refcount,
> - bo->base.base.size,
> + bo->base.size,
> resident_size,
> - drm_vma_node_start(&bo->base.base.vma_node));
> + drm_vma_node_start(&bo->base.vma_node));
>
> - if (bo->base.base.import_attach)
> + if (bo->base.import_attach)
> gem_state_flags |= PANTHOR_DEBUGFS_GEM_STATE_FLAG_IMPORTED;
> - if (bo->base.base.dma_buf)
> + if (bo->base.dma_buf)
> gem_state_flags |= PANTHOR_DEBUGFS_GEM_STATE_FLAG_EXPORTED;
>
> seq_printf(m, "0x%-8x 0x%-10x", gem_state_flags, gem_usage_flags);
> @@ -679,10 +1141,8 @@ static void panthor_gem_debugfs_bo_print(struct
> panthor_gem_object *bo,
> seq_printf(m, "%s\n", bo->label.str ? : "");
> }
>
> - totals->size += bo->base.base.size;
> + totals->size += bo->base.size;
> totals->resident += resident_size;
> - if (bo->base.madv > 0)
> - totals->reclaimable += resident_size;
> }
>
> static void panthor_gem_debugfs_print_bos(struct panthor_device *ptdev,
> diff --git a/drivers/gpu/drm/panthor/panthor_gem.h
> b/drivers/gpu/drm/panthor/panthor_gem.h
> index 94b2d17cf032..b66478c9590c 100644
> --- a/drivers/gpu/drm/panthor/panthor_gem.h
> +++ b/drivers/gpu/drm/panthor/panthor_gem.h
> @@ -5,7 +5,7 @@
> #ifndef __PANTHOR_GEM_H__
> #define __PANTHOR_GEM_H__
>
> -#include <drm/drm_gem_shmem_helper.h>
> +#include <drm/drm_gem.h>
> #include <drm/drm_mm.h>
>
> #include <linux/iosys-map.h>
> @@ -60,12 +60,51 @@ struct panthor_gem_debugfs {
> u32 flags;
> };
>
> +/**
> + * struct panthor_gem_backing - GEM memory backing related data
> + */
> +struct panthor_gem_backing {
> + /** @pages: Pages requested with drm_gem_get_pages() */
> + struct page **pages;
> +
> + /** @pin_count: Number of active pin requests on this GEM */
> + refcount_t pin_count;
> +};
> +
> +/**
> + * struct panthor_gem_cpu_map - GEM CPU mapping related data
> + */
> +struct panthor_gem_cpu_map {
> + /** @vaddr: Address returned by vmap() */
> + void *vaddr;
> +
> + /** @vaddr_use_count: Number of active vmap() requests on this GEM */
> + refcount_t vaddr_use_count;
> +};
> +
> +/**
> + * struct panthor_gem_dev_map - GEM device mapping related data
> + */
> +struct panthor_gem_dev_map {
> + /** @sgt: Device mapped sg_table for this GEM */
> + struct sg_table *sgt;
> +};
> +
> /**
> * struct panthor_gem_object - Driver specific GEM object.
> */
> struct panthor_gem_object {
> - /** @base: Inherit from drm_gem_shmem_object. */
> - struct drm_gem_shmem_object base;
> + /** @base: Inherit from drm_gem_object. */
> + struct drm_gem_object base;
> +
> + /** @backing: Memory backing state */
> + struct panthor_gem_backing backing;
> +
> + /** @cmap: CPU mapping state */
> + struct panthor_gem_cpu_map cmap;
> +
> + /** @dmap: Device mapping state */
> + struct panthor_gem_dev_map dmap;
>
> /**
> * @exclusive_vm_root_gem: Root GEM of the exclusive VM this GEM
> object
> @@ -130,22 +169,25 @@ struct panthor_kernel_bo {
> void *kmap;
> };
>
> -static inline
> -struct panthor_gem_object *to_panthor_bo(struct drm_gem_object *obj)
> -{
> - return container_of(to_drm_gem_shmem_obj(obj), struct
> panthor_gem_object, base);
> -}
> +#define to_panthor_bo(obj) container_of_const(obj, struct
> panthor_gem_object, base)
>
> void panthor_gem_init(struct panthor_device *ptdev);
>
> -struct drm_gem_object *panthor_gem_create_object(struct drm_device *ddev,
> size_t size);
> -
> +struct drm_gem_object *
> +panthor_gem_prime_import_sg_table(struct drm_device *dev,
> + struct dma_buf_attachment *attach,
> + struct sg_table *sgt);
> int
> panthor_gem_create_with_handle(struct drm_file *file,
> struct drm_device *ddev,
> struct panthor_vm *exclusive_vm,
> u64 *size, u32 flags, uint32_t *handle);
>
> +struct sg_table *
> +panthor_gem_get_dev_sgt(struct panthor_gem_object *bo);
> +int panthor_gem_pin(struct panthor_gem_object *bo);
> +void panthor_gem_unpin(struct panthor_gem_object *bo);
> +
> void panthor_gem_bo_set_label(struct drm_gem_object *obj, const char *label);
> void panthor_gem_kernel_bo_set_label(struct panthor_kernel_bo *bo, const
> char *label);
> int panthor_gem_sync(struct drm_gem_object *obj,
> diff --git a/drivers/gpu/drm/panthor/panthor_mmu.c
> b/drivers/gpu/drm/panthor/panthor_mmu.c
> index 99c794c429ca..dc2d653edf12 100644
> --- a/drivers/gpu/drm/panthor/panthor_mmu.c
> +++ b/drivers/gpu/drm/panthor/panthor_mmu.c
> @@ -5,6 +5,7 @@
> #include <drm/drm_debugfs.h>
> #include <drm/drm_drv.h>
> #include <drm/drm_exec.h>
> +#include <drm/drm_file.h>
> #include <drm/drm_gpuvm.h>
> #include <drm/drm_managed.h>
> #include <drm/drm_print.h>
> @@ -1083,8 +1084,7 @@ static void panthor_vm_bo_free(struct drm_gpuvm_bo
> *vm_bo)
> {
> struct panthor_gem_object *bo = to_panthor_bo(vm_bo->obj);
>
> - if (!drm_gem_is_imported(&bo->base.base))
> - drm_gem_shmem_unpin(&bo->base);
> + panthor_gem_unpin(bo);
> kfree(vm_bo);
> }
>
> @@ -1206,7 +1206,7 @@ static int panthor_vm_prepare_map_op_ctx(struct
> panthor_vm_op_ctx *op_ctx,
> return -EINVAL;
>
> /* Make sure the VA and size are in-bounds. */
> - if (size > bo->base.base.size || offset > bo->base.base.size - size)
> + if (size > bo->base.size || offset > bo->base.size - size)
> return -EINVAL;
>
> /* If the BO has an exclusive VM attached, it can't be mapped to
> other VMs. */
> @@ -1223,39 +1223,30 @@ static int panthor_vm_prepare_map_op_ctx(struct
> panthor_vm_op_ctx *op_ctx,
> if (ret)
> goto err_cleanup;
>
> - if (!drm_gem_is_imported(&bo->base.base)) {
> - /* Pre-reserve the BO pages, so the map operation doesn't
> have to
> - * allocate. This pin is dropped in panthor_vm_bo_free(), so
> - * once we have successfully called drm_gpuvm_bo_create(),
> - * GPUVM will take care of dropping the pin for us.
> - */
> - ret = drm_gem_shmem_pin(&bo->base);
> - if (ret)
> - goto err_cleanup;
> - }
> + /* Pre-reserve the BO pages, so the map operation doesn't have to
> + * allocate.
> + */
> + ret = panthor_gem_pin(bo);
> + if (ret)
> + goto err_cleanup;
>
> - sgt = drm_gem_shmem_get_pages_sgt(&bo->base);
> + sgt = panthor_gem_get_dev_sgt(bo);
> if (IS_ERR(sgt)) {
> - if (!drm_gem_is_imported(&bo->base.base))
> - drm_gem_shmem_unpin(&bo->base);
> -
> + panthor_gem_unpin(bo);
> ret = PTR_ERR(sgt);
> goto err_cleanup;
> }
>
> op_ctx->map.sgt = sgt;
>
> - preallocated_vm_bo = drm_gpuvm_bo_create(&vm->base, &bo->base.base);
> + preallocated_vm_bo = drm_gpuvm_bo_create(&vm->base, &bo->base);
> if (!preallocated_vm_bo) {
> - if (!drm_gem_is_imported(&bo->base.base))
> - drm_gem_shmem_unpin(&bo->base);
> -
> + panthor_gem_unpin(bo);
> ret = -ENOMEM;
> goto err_cleanup;
> }
>
> op_ctx->map.vm_bo = drm_gpuvm_bo_obtain_prealloc(preallocated_vm_bo);
> -
> op_ctx->map.bo_offset = offset;
>
> /* L1, L2 and L3 page tables.
> @@ -1284,7 +1275,7 @@ static int panthor_vm_prepare_map_op_ctx(struct
> panthor_vm_op_ctx *op_ctx,
> }
>
> /* Insert BO into the extobj list last, when we know nothing can
> fail. */
> - if (bo->base.base.resv != panthor_vm_resv(vm)) {
> + if (bo->base.resv != panthor_vm_resv(vm)) {
> dma_resv_lock(panthor_vm_resv(vm), NULL);
> drm_gpuvm_bo_extobj_add(op_ctx->map.vm_bo);
> dma_resv_unlock(panthor_vm_resv(vm));
> @@ -2056,9 +2047,9 @@ static void panthor_vma_link(struct panthor_vm *vm,
> {
> struct panthor_gem_object *bo = to_panthor_bo(vma->base.gem.obj);
>
> - mutex_lock(&bo->base.base.gpuva.lock);
> + mutex_lock(&bo->base.gpuva.lock);
> drm_gpuva_link(&vma->base, vm_bo);
> - mutex_unlock(&bo->base.base.gpuva.lock);
> + mutex_unlock(&bo->base.gpuva.lock);
> }
>
> static void panthor_vma_unlink(struct panthor_vma *vma)
> @@ -2110,11 +2101,12 @@ static int panthor_gpuva_sm_step_map(struct
> drm_gpuva_op *op, void *priv)
> static bool
> iova_mapped_as_huge_page(struct drm_gpuva_op_map *op, u64 addr)
> {
> + struct panthor_gem_object *bo = to_panthor_bo(op->gem.obj);
> const struct page *pg;
> pgoff_t bo_offset;
>
> bo_offset = addr - op->va.addr + op->gem.offset;
> - pg = to_panthor_bo(op->gem.obj)->base.pages[bo_offset >> PAGE_SHIFT];
> + pg = bo->backing.pages[bo_offset >> PAGE_SHIFT];
>
> return folio_size(page_folio(pg)) >= SZ_2M;
> }
> @@ -2183,7 +2175,7 @@ static int panthor_gpuva_sm_step_remap(struct
> drm_gpuva_op *op,
> u64 size = op->remap.prev->va.addr + op->remap.prev->va.range
> - unmap_start;
>
> ret = panthor_vm_map_pages(vm, unmap_start,
> flags_to_prot(unmap_vma->flags),
> - bo->base.sgt, offset, size);
> + bo->dmap.sgt, offset, size);
> if (ret)
> return ret;
>
> @@ -2197,7 +2189,7 @@ static int panthor_gpuva_sm_step_remap(struct
> drm_gpuva_op *op,
> u64 size = unmap_start + unmap_range -
> op->remap.next->va.addr;
>
> ret = panthor_vm_map_pages(vm, addr,
> flags_to_prot(unmap_vma->flags),
> - bo->base.sgt,
> op->remap.next->gem.offset, size);
> + bo->dmap.sgt,
> op->remap.next->gem.offset, size);
> if (ret)
> return ret;
>
> diff --git a/drivers/gpu/drm/panthor/panthor_sched.c
> b/drivers/gpu/drm/panthor/panthor_sched.c
> index ca272dbae14d..2ddf64870d85 100644
> --- a/drivers/gpu/drm/panthor/panthor_sched.c
> +++ b/drivers/gpu/drm/panthor/panthor_sched.c
> @@ -3,7 +3,7 @@
>
> #include <drm/drm_drv.h>
> #include <drm/drm_exec.h>
> -#include <drm/drm_gem_shmem_helper.h>
> +#include <drm/drm_file.h>
> #include <drm/drm_managed.h>
> #include <drm/drm_print.h>
> #include <drm/gpu_scheduler.h>
> @@ -871,8 +871,7 @@ panthor_queue_get_syncwait_obj(struct panthor_group
> *group, struct panthor_queue
> int ret;
>
> if (queue->syncwait.kmap) {
> - bo = container_of(queue->syncwait.obj,
> - struct panthor_gem_object, base.base);
> + bo = to_panthor_bo(queue->syncwait.obj);
> goto out_sync;
> }
>
> @@ -882,7 +881,7 @@ panthor_queue_get_syncwait_obj(struct panthor_group
> *group, struct panthor_queue
> if (drm_WARN_ON(&ptdev->base, IS_ERR_OR_NULL(bo)))
> goto err_put_syncwait_obj;
>
> - queue->syncwait.obj = &bo->base.base;
> + queue->syncwait.obj = &bo->base;
> ret = drm_gem_vmap(queue->syncwait.obj, &map);
> if (drm_WARN_ON(&ptdev->base, ret))
> goto err_put_syncwait_obj;
> @@ -896,7 +895,7 @@ panthor_queue_get_syncwait_obj(struct panthor_group
> *group, struct panthor_queue
> * drm_gem_shmem_sync() is a NOP if map_wc=true, so no need to check
> * it here.
> */
> - panthor_gem_sync(&bo->base.base, queue->syncwait.offset,
> + panthor_gem_sync(&bo->base, queue->syncwait.offset,
> queue->syncwait.sync64 ?
> sizeof(struct panthor_syncobj_64b) :
> sizeof(struct panthor_syncobj_32b),
> --
> 2.52.0
>
