linux-kernel - Re: [PATCH] drm/i915: implement vmap/vunmap GEM object functions

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Message-ID: <37397082-833f-4e3b-8dda-76a51d2369e6@suse.de>
Date: Wed, 5 Mar 2025 07:50:30 +0100
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Asbjørn Sloth Tønnesen <asbjorn@...jorn.st>,
 intel-gfx@...ts.freedesktop.org
Cc: Jani Nikula <jani.nikula@...ux.intel.com>,
 Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
 Rodrigo Vivi <rodrigo.vivi@...el.com>, Tvrtko Ursulin
 <tursulin@...ulin.net>, David Airlie <airlied@...il.com>,
 Daniel Vetter <daniel@...ll.ch>, Jouni Högander
 <jouni.hogander@...el.com>, Zhao Liu <zhao1.liu@...el.com>,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i915: implement vmap/vunmap GEM object functions



Am 02.07.24 um 09:17 schrieb Thomas Zimmermann:
> Hi
>
> Am 29.06.24 um 20:25 schrieb Asbjørn Sloth Tønnesen:
>> Implement i915_gem_vmap_object() and i915_gem_vunmap_object(),
>> based on i915_gem_dmabuf_vmap() and i915_gem_dmabuf_vunmap().
>>
>> This enables a drm_client to use drm_client_buffer_vmap() and
>> drm_client_buffer_vunmap() on hardware using the i915 driver.
>>
>> Tested with a currently out of tree pixelflut drm_client[1] on:
>> - Lenovo ThinkCentre M720q (CoffeeLake-S GT2 / Intel UHD Graphics 630)
>> - Dell Wyse N06D - 3030 LT (ValleyView on Intel Celeron N2807 SOC)
>>
>> [1] XDP->DRM pixelflut: https://labitat.dk/wiki/Pixelflut-XDR
>>
>> Signed-off-by: Asbjørn Sloth Tønnesen <asbjorn@...jorn.st>
>
> I didn't do a review, but
>
> Ack-by: Thomas Zimmermann <tzimmermann@...e.de>

Acked-by: Thomas Zimmermann <tzimmermann@...e.de>

>
>
> as it would possible allow to share more code with the fbdev helpers.
>
> Best regards
> Thomas
>
>> ---
>> This patch applies on top of drm-intel/drm-intel-next (32a120f52a4c)
>>
>>   drivers/gpu/drm/i915/gem/i915_gem_object.c | 26 ++++++++++++++++++++++
>>   1 file changed, 26 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c 
>> b/drivers/gpu/drm/i915/gem/i915_gem_object.c
>> index 58e6c680fe0d..356530b599ce 100644
>> --- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
>> +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
>> @@ -873,6 +873,30 @@ bool i915_gem_object_needs_ccs_pages(struct 
>> drm_i915_gem_object *obj)
>>       return lmem_placement;
>>   }
>>   +static int i915_gem_vmap_object(struct drm_gem_object *gem_obj,
>> +                struct iosys_map *map)
>> +{
>> +    struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
>> +    void *vaddr;
>> +
>> +    vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB);
>> +    if (IS_ERR(vaddr))
>> +        return PTR_ERR(vaddr);
>> +
>> +    iosys_map_set_vaddr(map, vaddr);
>> +
>> +    return 0;
>> +}
>> +
>> +static void i915_gem_vunmap_object(struct drm_gem_object *gem_obj,
>> +                   struct iosys_map *map)
>> +{
>> +    struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
>> +
>> +    i915_gem_object_flush_map(obj);
>> +    i915_gem_object_unpin_map(obj);
>> +}
>> +
>>   void i915_gem_init__objects(struct drm_i915_private *i915)
>>   {
>>       INIT_WORK(&i915->mm.free_work, __i915_gem_free_work);
>> @@ -896,6 +920,8 @@ static const struct drm_gem_object_funcs 
>> i915_gem_object_funcs = {
>>       .free = i915_gem_free_object,
>>       .close = i915_gem_close_object,
>>       .export = i915_gem_prime_export,
>> +    .vmap = i915_gem_vmap_object,
>> +    .vunmap = i915_gem_vunmap_object,
>>   };
>>     /**
>

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)