AMD-GFX Archive on lore.kernel.org
 help / color / Atom feed
From: Thomas Zimmermann <tzimmermann@suse.de>
To: "Christian König" <christian.koenig@amd.com>,
	"Christian König" <ckoenig.leichtzumerken@gmail.com>,
	alexander.deucher@amd.com, airlied@linux.ie, daniel@ffwll.ch,
	bskeggs@redhat.com, ray.huang@amd.com,
	linux-graphics-maintainer@vmware.com, sroland@vmware.com,
	zackr@vmware.com, shashank.sharma@amd.com, sam@ravnborg.org,
	emil.velikov@collabora.com, Felix.Kuehling@amd.com,
	nirmoy.das@amd.com
Cc: nouveau@lists.freedesktop.org, amd-gfx@lists.freedesktop.org,
	dri-devel@lists.freedesktop.org
Subject: Re: [PATCH v3 5/7] drm/vmwgfx: Inline ttm_bo_mmap() into vmwgfx driver
Date: Tue, 20 Apr 2021 09:51:27 +0200
Message-ID: <52403618-62f5-2085-c245-e1e98762cccb@suse.de> (raw)
In-Reply-To: <80012c09-6975-f694-420f-72b2236dcf4e@amd.com>

[-- Attachment #1.1.1: Type: text/plain, Size: 5098 bytes --]

Hi

Am 16.04.21 um 15:51 schrieb Christian König:
> Am 16.04.21 um 15:46 schrieb Christian König:
>> Am 16.04.21 um 15:31 schrieb Thomas Zimmermann:
>>> The vmwgfx driver is the only remaining user of ttm_bo_mmap(). Inline
>>> the code. The internal helper ttm_bo_vm_lookup() is now also part of
>>> vmwgfx as vmw_bo_vm_lookup().
>>>
>>> v2:
>>>     * replace pr_err() with drm_err() (Zack)
>>>
>>> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
>>> Reviewed-by: Zack Rusin <zackr@vmware.com>
>>> ---
>>>   drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c | 56 ++++++++++++++++++++++--
>>>   1 file changed, 53 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c 
>>> b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
>>> index cb9975889e2f..c8b6543b4e39 100644
>>> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
>>> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
>>> @@ -27,6 +27,32 @@
>>>     #include "vmwgfx_drv.h"
>>>   +static struct ttm_buffer_object *vmw_bo_vm_lookup(struct 
>>> ttm_device *bdev,
>>> +                          unsigned long offset,
>>> +                          unsigned long pages)
>>> +{
>>> +    struct vmw_private *dev_priv = container_of(bdev, struct 
>>> vmw_private, bdev);
>>> +    struct drm_device *drm = &dev_priv->drm;
>>> +    struct drm_vma_offset_node *node;
>>> +    struct ttm_buffer_object *bo = NULL;
>>> +
>>> +    drm_vma_offset_lock_lookup(bdev->vma_manager);
>>> +
>>> +    node = drm_vma_offset_lookup_locked(bdev->vma_manager, offset, 
>>> pages);
>>> +    if (likely(node)) {
>>> +        bo = container_of(node, 
struct ttm_buffer_object,
>>> +                  base.vma_node);
>>> +        bo = ttm_bo_get_unless_zero(bo);
>>> +    }
>>> +
>>> +    drm_vma_offset_unlock_lookup(bdev->vma_manager);
>>> +
>>> +    if (!bo)
>>> +        drm_err(drm, "Could not find buffer object to map\n");
>>> +
>>> +    return bo;
>>> +}
>>> +
>>>   int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
>>>   {
>>>       static const struct vm_operations_struct vmw_vm_ops = {
>>> @@ -41,10 +67,28 @@ int vmw_mmap(struct file *filp, struct 
>>> vm_area_struct *vma)
>>>       };
>>>       struct drm_file *file_priv = filp->private_data;
>>>       struct vmw_private *dev_priv = vmw_priv(file_priv->minor->dev);
>>> -    int ret = ttm_bo_mmap(filp, vma, &dev_priv->bdev);
>>> +    struct ttm_device *bdev = &dev_priv->bdev;
>>> +    struct ttm_buffer_object *bo;
>>> +    int ret;
>>> +
>>> +    if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET_START))
>>> +        return -EINVAL;
>>> +
>>> +    bo = vmw_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma));
>>> +    if (unlikely(!bo))
>>> +        return -EINVAL;
>>>   -    if (ret)
>>> -        return ret;
>>> +    if (unlikely(!bo->bdev->funcs->verify_access)) {
>>> +        ret = -EPERM;
>>> +        goto out_unref;
>>> +    }
>>> +    ret = bo->bdev->funcs->verify_access(bo, filp);
>>
>> Is there any reason we can't call vmw_verify_access() directly here?
>>
>> Would allow us to completely nuke the verify_access callback as well 
>> as far as I can see.
> 
> Forget what I said, couldn't see the next patch in my mailbox at time of 
> writing.
> 
> Whole series is Reviewed-by: Christian König <christian.koenig@amd.com>

Thanks a lot. If I'm not mistaken, the patches at [1] need to go in 
first. So it could take a a bit until this lands.

Otherwise, this series could go through the same tree as [1] if nouveau 
and vmwgfx devs don't mind.

Best regards
Thomas

[1] https://patchwork.freedesktop.org/series/88822/

> 
> Thanks for the nice cleanup,
> Christian.
> 
>>
>> Regards,
>> Christian.
>>
>>> +    if (unlikely(ret != 0))
>>> +        goto out_unref;
>>> +
>>> +    ret = ttm_bo_mmap_obj(vma, bo);
>>> +    if (unlikely(ret != 0))
>>> +        goto out_unref;
>>>         vma->vm_ops = &vmw_vm_ops;
>>>   @@ -52,7 +96,13 @@ int vmw_mmap(struct file *filp, struct 
>>> vm_area_struct *vma)
>>>       if (!is_cow_mapping(vma->vm_flags))
>>>           vma->vm_flags = (vma->vm_flags & ~VM_MIXEDMAP) | VM_PFNMAP;
>>>   +    ttm_bo_put(bo); /* release extra ref taken 
by 
>>> ttm_bo_mmap_obj() */
>>> +
>>>       return 0;
>>> +
>>> +out_unref:
>>> +    ttm_bo_put(bo);
>>> +    return ret;
>>>   }
>>>     /* struct vmw_validation_mem callback */
>>
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


[-- Attachment #1.2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 840 bytes --]

[-- Attachment #2: Type: text/plain, Size: 154 bytes --]

_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx

  reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-16 13:31 [PATCH v3 0/7] drm: Clean up mmap for TTM-based GEM drivers Thomas Zimmermann
2021-04-16 13:31 ` [PATCH v3 1/7] drm/ttm: Don't override vm_ops callbacks, if set Thomas Zimmermann
2021-04-16 13:31 ` [PATCH v3 2/7] drm/amdgpu: Implement mmap as GEM object function Thomas Zimmermann
2021-04-16 13:31 ` [PATCH v3 3/7] drm/radeon: " Thomas Zimmermann
2021-04-16 13:31 ` [PATCH v3 4/7] drm/nouveau: " Thomas Zimmermann
2021-04-16 13:31 ` [PATCH v3 5/7] drm/vmwgfx: Inline ttm_bo_mmap() into vmwgfx driver Thomas Zimmermann
2021-04-16 13:46   ` Christian König
2021-04-16 13:51     ` Christian König
2021-04-20  7:51       ` Thomas Zimmermann [this message]
2021-04-20  8:51         ` Daniel Vetter
2021-04-20 20:22           ` Felix Kuehling
2021-04-20 20:53             ` Daniel Vetter
2021-04-21  7:01               ` Christian König
2021-04-21  9:12                 ` Daniel Vetter
2021-04-16 14:00     ` Thomas Zimmermann
2021-04-16 13:31 ` [PATCH v3 6/7] drm/vmwgfx: Inline vmw_verify_access() Thomas Zimmermann
2021-04-16 13:31 ` [PATCH v3 7/7] drm/ttm: Remove ttm_bo_mmap() and friends Thomas Zimmermann
2021-04-16 13:44 ` [PATCH v3 0/7] drm: Clean up mmap for TTM-based GEM drivers Christian König

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=52403618-62f5-2085-c245-e1e98762cccb@suse.de \
    --to=tzimmermann@suse.de \
    --cc=Felix.Kuehling@amd.com \
    --cc=airlied@linux.ie \
    --cc=alexander.deucher@amd.com \
    --cc=amd-gfx@lists.freedesktop.org \
    --cc=bskeggs@redhat.com \
    --cc=christian.koenig@amd.com \
    --cc=ckoenig.leichtzumerken@gmail.com \
    --cc=daniel@ffwll.ch \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=emil.velikov@collabora.com \
    --cc=linux-graphics-maintainer@vmware.com \
    --cc=nirmoy.das@amd.com \
    --cc=nouveau@lists.freedesktop.org \
    --cc=ray.huang@amd.com \
    --cc=sam@ravnborg.org \
    --cc=shashank.sharma@amd.com \
    --cc=sroland@vmware.com \
    --cc=zackr@vmware.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

AMD-GFX Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/amd-gfx/0 amd-gfx/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 amd-gfx amd-gfx/ https://lore.kernel.org/amd-gfx \
		amd-gfx@lists.freedesktop.org
	public-inbox-index amd-gfx

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.freedesktop.lists.amd-gfx


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git