drm/rockchip: Implement mmap as GEM object function
Thomas Zimmermann
tzimmermann at suse.de
Wed Oct 20 07:06:58 PDT 2021
Hi
Am 19.10.21 um 16:02 schrieb Alex Bee:
>
> Am 24.06.21 um 11:55 schrieb Thomas Zimmermann:
>> Moving the driver-specific mmap code into a GEM object function allows
>> for using DRM helpers for various mmap callbacks.
>>
>> The respective rockchip functions are being removed. The file_operations
>> structure fops is now being created by the helper macro
>> DEFINE_DRM_GEM_FOPS().
>
> Also
>
> Tested-by: Alex Bee <knaerzche at gmail.com>
>
> on RK3188/RK3066, i.e. on SoCs w/o IOMMU for vop.
>
> Could someone pick this up for review/merging?
Yes, please! I've been waiting for months. And there are only 2 or 3
drivers' mmap functions left to convert.
Best regards
Thomas
>
> Thanks,
>
> Alex.
>
>> Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
>> Tested-by: Heiko Stuebner <heiko at sntech.de>
>> ---
>> drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 13 +-----
>> drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c | 3 +-
>> drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 44 +++++--------------
>> drivers/gpu/drm/rockchip/rockchip_drm_gem.h | 7 ---
>> 4 files changed, 15 insertions(+), 52 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
>> b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
>> index b730b8d5d949..2e3ab573a817 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
>> @@ -208,16 +208,7 @@ static void rockchip_drm_unbind(struct device *dev)
>> drm_dev_put(drm_dev);
>> }
>> -static const struct file_operations rockchip_drm_driver_fops = {
>> - .owner = THIS_MODULE,
>> - .open = drm_open,
>> - .mmap = rockchip_gem_mmap,
>> - .poll = drm_poll,
>> - .read = drm_read,
>> - .unlocked_ioctl = drm_ioctl,
>> - .compat_ioctl = drm_compat_ioctl,
>> - .release = drm_release,
>> -};
>> +DEFINE_DRM_GEM_FOPS(rockchip_drm_driver_fops);
>> static const struct drm_driver rockchip_drm_driver = {
>> .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
>> @@ -226,7 +217,7 @@ static const struct drm_driver rockchip_drm_driver
>> = {
>> .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
>> .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
>> .gem_prime_import_sg_table = rockchip_gem_prime_import_sg_table,
>> - .gem_prime_mmap = rockchip_gem_mmap_buf,
>> + .gem_prime_mmap = drm_gem_prime_mmap,
>> .fops = &rockchip_drm_driver_fops,
>> .name = DRIVER_NAME,
>> .desc = DRIVER_DESC,
>> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c
>> b/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c
>> index 2fdc455c4ad7..d8418dd39d0e 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c
>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c
>> @@ -7,6 +7,7 @@
>> #include <drm/drm.h>
>> #include <drm/drm_fb_helper.h>
>> #include <drm/drm_fourcc.h>
>> +#include <drm/drm_prime.h>
>> #include <drm/drm_probe_helper.h>
>> #include "rockchip_drm_drv.h"
>> @@ -24,7 +25,7 @@ static int rockchip_fbdev_mmap(struct fb_info *info,
>> struct drm_fb_helper *helper = info->par;
>> struct rockchip_drm_private *private = to_drm_private(helper);
>> - return rockchip_gem_mmap_buf(private->fbdev_bo, vma);
>> + return drm_gem_prime_mmap(private->fbdev_bo, vma);
>> }
>> static const struct fb_ops rockchip_drm_fbdev_ops = {
>> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
>> b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
>> index 7971f57436dd..63eb73b624aa 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
>> @@ -240,12 +240,22 @@ static int rockchip_drm_gem_object_mmap(struct
>> drm_gem_object *obj,
>> int ret;
>> struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
>> + /*
>> + * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and
>> map the
>> + * whole buffer from the start.
>> + */
>> + vma->vm_pgoff = 0;
>> +
>> /*
>> * We allocated a struct page table for rk_obj, so clear
>> * VM_PFNMAP flag that was set by
>> drm_gem_mmap_obj()/drm_gem_mmap().
>> */
>> + vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
>> vma->vm_flags &= ~VM_PFNMAP;
>> + vma->vm_page_prot =
>> pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
>> + vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
>> +
>> if (rk_obj->pages)
>> ret = rockchip_drm_gem_object_mmap_iommu(obj, vma);
>> else
>> @@ -257,39 +267,6 @@ static int rockchip_drm_gem_object_mmap(struct
>> drm_gem_object *obj,
>> return ret;
>> }
>> -int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
>> - struct vm_area_struct *vma)
>> -{
>> - int ret;
>> -
>> - ret = drm_gem_mmap_obj(obj, obj->size, vma);
>> - if (ret)
>> - return ret;
>> -
>> - return rockchip_drm_gem_object_mmap(obj, vma);
>> -}
>> -
>> -/* drm driver mmap file operations */
>> -int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
>> -{
>> - struct drm_gem_object *obj;
>> - int ret;
>> -
>> - ret = drm_gem_mmap(filp, vma);
>> - if (ret)
>> - return ret;
>> -
>> - /*
>> - * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and
>> map the
>> - * whole buffer from the start.
>> - */
>> - vma->vm_pgoff = 0;
>> -
>> - obj = vma->vm_private_data;
>> -
>> - return rockchip_drm_gem_object_mmap(obj, vma);
>> -}
>> -
>> static void rockchip_gem_release_object(struct rockchip_gem_object
>> *rk_obj)
>> {
>> drm_gem_object_release(&rk_obj->base);
>> @@ -301,6 +278,7 @@ static const struct drm_gem_object_funcs
>> rockchip_gem_object_funcs = {
>> .get_sg_table = rockchip_gem_prime_get_sg_table,
>> .vmap = rockchip_gem_prime_vmap,
>> .vunmap = rockchip_gem_prime_vunmap,
>> + .mmap = rockchip_drm_gem_object_mmap,
>> .vm_ops = &drm_gem_cma_vm_ops,
>> };
>> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
>> b/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
>> index 5a70a56cd406..47c1861eece0 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
>> @@ -34,13 +34,6 @@ rockchip_gem_prime_import_sg_table(struct
>> drm_device *dev,
>> int rockchip_gem_prime_vmap(struct drm_gem_object *obj, struct
>> dma_buf_map *map);
>> void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, struct
>> dma_buf_map *map);
>> -/* drm driver mmap file operations */
>> -int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma);
>> -
>> -/* mmap a gem object to userspace. */
>> -int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
>> - struct vm_area_struct *vma);
>> -
>> struct rockchip_gem_object *
>> rockchip_gem_create_object(struct drm_device *drm, unsigned int
>> size,
>> bool alloc_kmap);
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer
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