[PATCH v5 05/14] drm/panthor: Add GEM logical block
Boris Brezillon
boris.brezillon at collabora.com
Sun Feb 18 21:41:19 UTC 2024
Anything relating to GEM object management is placed here. Nothing
particularly interesting here, given the implementation is based on
drm_gem_shmem_object, which is doing most of the work.
v5:
- Add Liviu's and Steve's R-b
v4:
- Force kernel BOs to be GPU mapped
- Make panthor_kernel_bo_destroy() robust against ERR/NULL BO pointers
to simplify the call sites
v3:
- Add acks for the MIT/GPL2 relicensing
- Provide a panthor_kernel_bo abstraction for buffer objects managed by
the kernel (will replace panthor_fw_mem and be used everywhere we were
using panthor_gem_create_and_map() before)
- Adjust things to match drm_gpuvm changes
- Change return of panthor_gem_create_with_handle() to int
Co-developed-by: Steven Price <steven.price at arm.com>
Signed-off-by: Steven Price <steven.price at arm.com>
Signed-off-by: Boris Brezillon <boris.brezillon at collabora.com>
Acked-by: Steven Price <steven.price at arm.com> # MIT+GPL2 relicensing,Arm
Acked-by: Grant Likely <grant.likely at linaro.org> # MIT+GPL2 relicensing,Linaro
Acked-by: Boris Brezillon <boris.brezillon at collabora.com> # MIT+GPL2 relicensing,Collabora
Reviewed-by: Liviu Dudau <liviu.dudau at arm.com>
Reviewed-by: Steven Price <steven.price at arm.com>
---
drivers/gpu/drm/panthor/panthor_gem.c | 228 ++++++++++++++++++++++++++
drivers/gpu/drm/panthor/panthor_gem.h | 144 ++++++++++++++++
2 files changed, 372 insertions(+)
create mode 100644 drivers/gpu/drm/panthor/panthor_gem.c
create mode 100644 drivers/gpu/drm/panthor/panthor_gem.h
diff --git a/drivers/gpu/drm/panthor/panthor_gem.c b/drivers/gpu/drm/panthor/panthor_gem.c
new file mode 100644
index 000000000000..42e342fcad19
--- /dev/null
+++ b/drivers/gpu/drm/panthor/panthor_gem.c
@@ -0,0 +1,228 @@
+// SPDX-License-Identifier: GPL-2.0 or MIT
+/* Copyright 2019 Linaro, Ltd, Rob Herring <robh at kernel.org> */
+/* Copyright 2023 Collabora ltd. */
+
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/dma-buf.h>
+#include <linux/dma-mapping.h>
+
+#include <drm/panthor_drm.h>
+
+#include "panthor_device.h"
+#include "panthor_gem.h"
+#include "panthor_mmu.h"
+
+static void panthor_gem_free_object(struct drm_gem_object *obj)
+{
+ struct panthor_gem_object *bo = to_panthor_bo(obj);
+ struct drm_gem_object *vm_root_gem = bo->exclusive_vm_root_gem;
+
+ drm_gem_free_mmap_offset(&bo->base.base);
+ mutex_destroy(&bo->gpuva_list_lock);
+ drm_gem_shmem_free(&bo->base);
+ drm_gem_object_put(vm_root_gem);
+}
+
+/**
+ * panthor_kernel_bo_destroy() - Destroy a kernel buffer object
+ * @vm: The VM this BO was mapped to.
+ * @bo: Kernel buffer object to destroy. If NULL or an ERR_PTR(), the destruction
+ * is skipped.
+ */
+void panthor_kernel_bo_destroy(struct panthor_vm *vm,
+ struct panthor_kernel_bo *bo)
+{
+ int ret;
+
+ if (IS_ERR_OR_NULL(bo))
+ return;
+
+ panthor_kernel_bo_vunmap(bo);
+
+ if (drm_WARN_ON(bo->obj->dev,
+ to_panthor_bo(bo->obj)->exclusive_vm_root_gem != panthor_vm_root_gem(vm)))
+ goto out_free_bo;
+
+ ret = panthor_vm_unmap_range(vm, bo->va_node.start,
+ panthor_kernel_bo_size(bo));
+ if (ret)
+ goto out_free_bo;
+
+ panthor_vm_free_va(vm, &bo->va_node);
+ drm_gem_object_put(bo->obj);
+
+out_free_bo:
+ kfree(bo);
+}
+
+/**
+ * panthor_kernel_bo_create() - Create and map a GEM object to a VM
+ * @ptdev: Device.
+ * @vm: VM to map the GEM to. If NULL, the kernel object is not GPU mapped.
+ * @size: Size of the buffer object.
+ * @bo_flags: Combination of drm_panthor_bo_flags flags.
+ * @vm_map_flags: Combination of drm_panthor_vm_bind_op_flags (only those
+ * that are related to map operations).
+ * @gpu_va: GPU address assigned when mapping to the VM.
+ * If gpu_va == PANTHOR_VM_KERNEL_AUTO_VA, the virtual address will be
+ * automatically allocated.
+ *
+ * Return: A valid pointer in case of success, an ERR_PTR() otherwise.
+ */
+struct panthor_kernel_bo *
+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)
+{
+ struct drm_gem_shmem_object *obj;
+ struct panthor_kernel_bo *kbo;
+ struct panthor_gem_object *bo;
+ int ret;
+
+ if (drm_WARN_ON(&ptdev->base, !vm))
+ return ERR_PTR(-EINVAL);
+
+ kbo = kzalloc(sizeof(*kbo), GFP_KERNEL);
+ 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);
+ size = obj->base.size;
+ kbo->obj = &obj->base;
+ bo->flags = bo_flags;
+
+ ret = panthor_vm_alloc_va(vm, gpu_va, size, &kbo->va_node);
+ if (ret)
+ goto err_put_obj;
+
+ ret = panthor_vm_map_bo_range(vm, bo, 0, size, kbo->va_node.start, vm_map_flags);
+ if (ret)
+ goto err_free_va;
+
+ 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;
+ return kbo;
+
+err_free_va:
+ panthor_vm_free_va(vm, &kbo->va_node);
+
+err_put_obj:
+ drm_gem_object_put(&obj->base);
+
+err_free_bo:
+ kfree(kbo);
+ return ERR_PTR(ret);
+}
+
+static int panthor_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
+{
+ struct panthor_gem_object *bo = to_panthor_bo(obj);
+
+ /* Don't allow mmap on objects that have the NO_MMAP flag set. */
+ if (bo->flags & DRM_PANTHOR_BO_NO_MMAP)
+ return -EINVAL;
+
+ return drm_gem_shmem_object_mmap(obj, vma);
+}
+
+static struct dma_buf *
+panthor_gem_prime_export(struct drm_gem_object *obj, int flags)
+{
+ /* We can't export GEMs that have an exclusive VM. */
+ if (to_panthor_bo(obj)->exclusive_vm_root_gem)
+ return ERR_PTR(-EINVAL);
+
+ return drm_gem_prime_export(obj, flags);
+}
+
+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 = panthor_gem_mmap,
+ .export = panthor_gem_prime_export,
+ .vm_ops = &drm_gem_shmem_vm_ops,
+};
+
+/**
+ * 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_device *ptdev = container_of(ddev, struct panthor_device, base);
+ struct panthor_gem_object *obj;
+
+ obj = kzalloc(sizeof(*obj), GFP_KERNEL);
+ if (!obj)
+ return ERR_PTR(-ENOMEM);
+
+ obj->base.base.funcs = &panthor_gem_funcs;
+ obj->base.map_wc = !ptdev->coherent;
+ mutex_init(&obj->gpuva_list_lock);
+ drm_gem_gpuva_set_lock(&obj->base.base, &obj->gpuva_list_lock);
+
+ return &obj->base.base;
+}
+
+/**
+ * panthor_gem_create_with_handle() - Create a GEM object and attach it to a handle.
+ * @file: DRM file.
+ * @ddev: DRM device.
+ * @exclusive_vm: Exclusive VM. Not NULL if the GEM object can't be shared.
+ * @size: Size of the GEM object to allocate.
+ * @flags: Combination of drm_panthor_bo_flags flags.
+ * @handle: Pointer holding the handle pointing to the new GEM object.
+ *
+ * Return: Zero on success
+ */
+int
+panthor_gem_create_with_handle(struct drm_file *file,
+ struct drm_device *ddev,
+ struct panthor_vm *exclusive_vm,
+ size_t 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;
+
+ 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;
+ }
+
+ /*
+ * 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);
+ /* drop reference from allocate - handle holds it now. */
+ drm_gem_object_put(&shmem->base);
+
+ return ret;
+}
diff --git a/drivers/gpu/drm/panthor/panthor_gem.h b/drivers/gpu/drm/panthor/panthor_gem.h
new file mode 100644
index 000000000000..6c8010ceb641
--- /dev/null
+++ b/drivers/gpu/drm/panthor/panthor_gem.h
@@ -0,0 +1,144 @@
+/* SPDX-License-Identifier: GPL-2.0 or MIT */
+/* Copyright 2019 Linaro, Ltd, Rob Herring <robh at kernel.org> */
+/* Copyright 2023 Collabora ltd. */
+
+#ifndef __PANTHOR_GEM_H__
+#define __PANTHOR_GEM_H__
+
+#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_mm.h>
+
+#include <linux/iosys-map.h>
+#include <linux/rwsem.h>
+
+struct panthor_vm;
+
+/**
+ * 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;
+
+ /**
+ * @exclusive_vm_root_gem: Root GEM of the exclusive VM this GEM object
+ * is attached to.
+ *
+ * If @exclusive_vm_root_gem != NULL, any attempt to bind the GEM to a
+ * different VM will fail.
+ *
+ * All FW memory objects have this field set to the root GEM of the MCU
+ * VM.
+ */
+ struct drm_gem_object *exclusive_vm_root_gem;
+
+ /**
+ * @gpuva_list_lock: Custom GPUVA lock.
+ *
+ * Used to protect insertion of drm_gpuva elements to the
+ * drm_gem_object.gpuva.list list.
+ *
+ * We can't use the GEM resv for that, because drm_gpuva_link() is
+ * called in a dma-signaling path, where we're not allowed to take
+ * resv locks.
+ */
+ struct mutex gpuva_list_lock;
+
+ /** @flags: Combination of drm_panthor_bo_flags flags. */
+ u32 flags;
+};
+
+/**
+ * struct panthor_kernel_bo - Kernel buffer object.
+ *
+ * These objects are only manipulated by the kernel driver and not
+ * directly exposed to the userspace. The GPU address of a kernel
+ * BO might be passed to userspace though.
+ */
+struct panthor_kernel_bo {
+ /**
+ * @obj: The GEM object backing this kernel buffer object.
+ */
+ struct drm_gem_object *obj;
+
+ /**
+ * @va_node: VA space allocated to this GEM.
+ */
+ struct drm_mm_node va_node;
+
+ /**
+ * @kmap: Kernel CPU mapping of @gem.
+ */
+ 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);
+}
+
+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 *ddev,
+ 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,
+ size_t size,
+ u32 flags,
+ uint32_t *handle);
+
+static inline u64
+panthor_kernel_bo_gpuva(struct panthor_kernel_bo *bo)
+{
+ return bo->va_node.start;
+}
+
+static inline size_t
+panthor_kernel_bo_size(struct panthor_kernel_bo *bo)
+{
+ return bo->obj->size;
+}
+
+static inline int
+panthor_kernel_bo_vmap(struct panthor_kernel_bo *bo)
+{
+ struct iosys_map map;
+ int ret;
+
+ if (bo->kmap)
+ return 0;
+
+ ret = drm_gem_vmap_unlocked(bo->obj, &map);
+ if (ret)
+ return ret;
+
+ bo->kmap = map.vaddr;
+ return 0;
+}
+
+static inline void
+panthor_kernel_bo_vunmap(struct panthor_kernel_bo *bo)
+{
+ if (bo->kmap) {
+ struct iosys_map map = IOSYS_MAP_INIT_VADDR(bo->kmap);
+
+ drm_gem_vunmap_unlocked(bo->obj, &map);
+ bo->kmap = NULL;
+ }
+}
+
+struct panthor_kernel_bo *
+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);
+
+void panthor_kernel_bo_destroy(struct panthor_vm *vm,
+ struct panthor_kernel_bo *bo);
+
+#endif /* __PANTHOR_GEM_H__ */
--
2.43.0
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