VKMS currently does not handle dumb data, and as a consequence, it does not provide mechanisms for handling gem. This commit adds the necessary support for gem object/handler and the dumb functions.
Changes since V1: Daniel Vetter: - Add dumb buffer support to the same patchset Changes since V2: Haneen: - Add missing gem_free_object_unlocked callback to fix the warning "Memory manager not clean during takedown" Changes since V3: - None
Signed-off-by: Rodrigo Siqueira rodrigosiqueiramelo@gmail.com --- drivers/gpu/drm/vkms/Makefile | 2 +- drivers/gpu/drm/vkms/vkms_drv.c | 10 ++ drivers/gpu/drm/vkms/vkms_drv.h | 23 ++++ drivers/gpu/drm/vkms/vkms_gem.c | 179 ++++++++++++++++++++++++++++++++ 4 files changed, 213 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/vkms/vkms_gem.c
diff --git a/drivers/gpu/drm/vkms/Makefile b/drivers/gpu/drm/vkms/Makefile index 3f774a6a9c58..986297da51bf 100644 --- a/drivers/gpu/drm/vkms/Makefile +++ b/drivers/gpu/drm/vkms/Makefile @@ -1,3 +1,3 @@ -vkms-y := vkms_drv.o vkms_plane.o vkms_output.o vkms_crtc.o +vkms-y := vkms_drv.o vkms_plane.o vkms_output.o vkms_crtc.o vkms_gem.o
obj-$(CONFIG_DRM_VKMS) += vkms.o diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c index 740a4cbfed91..6ea2fd97bef9 100644 --- a/drivers/gpu/drm/vkms/vkms_drv.c +++ b/drivers/gpu/drm/vkms/vkms_drv.c @@ -37,6 +37,12 @@ static const struct file_operations vkms_driver_fops = { .release = drm_release, };
+static const struct vm_operations_struct vkms_gem_vm_ops = { + .fault = vkms_gem_fault, + .open = drm_gem_vm_open, + .close = drm_gem_vm_close, +}; + static void vkms_release(struct drm_device *dev) { struct vkms_device *vkms = container_of(dev, struct vkms_device, drm); @@ -50,6 +56,10 @@ static struct drm_driver vkms_driver = { .driver_features = DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM, .release = vkms_release, .fops = &vkms_driver_fops, + .dumb_create = vkms_dumb_create, + .dumb_map_offset = vkms_dumb_map, + .gem_vm_ops = &vkms_gem_vm_ops, + .gem_free_object_unlocked = vkms_gem_free_object,
.name = DRIVER_NAME, .desc = DRIVER_DESC, diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h index b0f9d2e61a42..cce4694cafb9 100644 --- a/drivers/gpu/drm/vkms/vkms_drv.h +++ b/drivers/gpu/drm/vkms/vkms_drv.h @@ -3,6 +3,7 @@
#include <drm/drmP.h> #include <drm/drm.h> +#include <drm/drm_gem.h> #include <drm/drm_encoder.h>
static const u32 vkms_formats[] = { @@ -21,6 +22,12 @@ struct vkms_device { struct vkms_output output; };
+struct vkms_gem_object { + struct drm_gem_object gem; + struct mutex pages_lock; /* Page lock used in page fault handler */ + struct page **pages; +}; + int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc, struct drm_plane *primary, struct drm_plane *cursor);
@@ -28,4 +35,20 @@ int vkms_output_init(struct vkms_device *vkmsdev);
struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev);
+/* Gem stuff */ +struct drm_gem_object *vkms_gem_create(struct drm_device *dev, + struct drm_file *file, + u32 *handle, + u64 size); + +int vkms_gem_fault(struct vm_fault *vmf); + +int vkms_dumb_create(struct drm_file *file, struct drm_device *dev, + struct drm_mode_create_dumb *args); + +int vkms_dumb_map(struct drm_file *file, struct drm_device *dev, + u32 handle, u64 *offset); + +void vkms_gem_free_object(struct drm_gem_object *obj); + #endif /* _VKMS_DRV_H_ */ diff --git a/drivers/gpu/drm/vkms/vkms_gem.c b/drivers/gpu/drm/vkms/vkms_gem.c new file mode 100644 index 000000000000..c7e38368602b --- /dev/null +++ b/drivers/gpu/drm/vkms/vkms_gem.c @@ -0,0 +1,179 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/shmem_fs.h> + +#include "vkms_drv.h" + +static struct vkms_gem_object *__vkms_gem_create(struct drm_device *dev, + u64 size) +{ + struct vkms_gem_object *obj; + int ret; + + obj = kzalloc(sizeof(*obj), GFP_KERNEL); + if (!obj) + return ERR_PTR(-ENOMEM); + + size = roundup(size, PAGE_SIZE); + ret = drm_gem_object_init(dev, &obj->gem, size); + if (ret) { + kfree(obj); + return ERR_PTR(ret); + } + + mutex_init(&obj->pages_lock); + + return obj; +} + +void vkms_gem_free_object(struct drm_gem_object *obj) +{ + struct vkms_gem_object *gem = container_of(obj, struct vkms_gem_object, + gem); + + kvfree(gem->pages); + mutex_destroy(&gem->pages_lock); + drm_gem_object_release(obj); + kfree(gem); +} + +int vkms_gem_fault(struct vm_fault *vmf) +{ + struct vm_area_struct *vma = vmf->vma; + struct vkms_gem_object *obj = vma->vm_private_data; + unsigned long vaddr = vmf->address; + pgoff_t page_offset; + loff_t num_pages; + int ret; + + page_offset = (vaddr - vma->vm_start) >> PAGE_SHIFT; + num_pages = DIV_ROUND_UP(obj->gem.size, PAGE_SIZE); + + if (page_offset > num_pages) + return VM_FAULT_SIGBUS; + + ret = -ENOENT; + mutex_lock(&obj->pages_lock); + if (obj->pages) { + get_page(obj->pages[page_offset]); + vmf->page = obj->pages[page_offset]; + ret = 0; + } + mutex_unlock(&obj->pages_lock); + if (ret) { + struct page *page; + struct address_space *mapping; + + mapping = file_inode(obj->gem.filp)->i_mapping; + page = shmem_read_mapping_page(mapping, page_offset); + + if (!IS_ERR(page)) { + vmf->page = page; + ret = 0; + } else { + switch (PTR_ERR(page)) { + case -ENOSPC: + case -ENOMEM: + ret = VM_FAULT_OOM; + break; + case -EBUSY: + ret = VM_FAULT_RETRY; + break; + case -EFAULT: + case -EINVAL: + ret = VM_FAULT_SIGBUS; + break; + default: + WARN_ON(PTR_ERR(page)); + ret = VM_FAULT_SIGBUS; + break; + } + } + } + return ret; +} + +struct drm_gem_object *vkms_gem_create(struct drm_device *dev, + struct drm_file *file, + u32 *handle, + u64 size) +{ + struct vkms_gem_object *obj; + int ret; + + if (!file || !dev || !handle) + return ERR_PTR(-EINVAL); + + obj = __vkms_gem_create(dev, size); + if (IS_ERR(obj)) + return ERR_CAST(obj); + + ret = drm_gem_handle_create(file, &obj->gem, handle); + drm_gem_object_put_unlocked(&obj->gem); + if (ret) { + drm_gem_object_release(&obj->gem); + kfree(obj); + return ERR_PTR(ret); + } + + return &obj->gem; +} + +int vkms_dumb_create(struct drm_file *file, struct drm_device *dev, + struct drm_mode_create_dumb *args) +{ + struct drm_gem_object *gem_obj; + u64 pitch, size; + + if (!args || !dev || !file) + return -EINVAL; + + pitch = args->width * DIV_ROUND_UP(args->bpp, 8); + size = pitch * args->height; + + if (!size) + return -EINVAL; + + gem_obj = vkms_gem_create(dev, file, &args->handle, size); + if (IS_ERR(gem_obj)) + return PTR_ERR(gem_obj); + + args->size = gem_obj->size; + args->pitch = pitch; + + DRM_DEBUG_DRIVER("Created object of size %lld\n", size); + + return 0; +} + +int vkms_dumb_map(struct drm_file *file, struct drm_device *dev, + u32 handle, u64 *offset) +{ + struct drm_gem_object *obj; + int ret; + + obj = drm_gem_object_lookup(file, handle); + if (!obj) + return -ENOENT; + + if (!obj->filp) { + ret = -EINVAL; + goto unref; + } + + ret = drm_gem_create_mmap_offset(obj); + if (ret) + goto unref; + + *offset = drm_vma_node_offset_addr(&obj->vma_node); +unref: + drm_gem_object_put_unlocked(obj); + + return ret; +}