[PATCH v3 4/8] drm/simpledrm: Use struct iosys_map consistently

[Thomas Zimmermann]

Hi

Am 17.11.22 um 19:40 schrieb Thierry Reding:
> From: Thierry Reding <treding at nvidia.com>
> 
> The majority of the driver already uses struct iosys_map to encapsulate
> accesses to I/O remapped vs. system memory. Accesses via the screen base
> pointer still use __iomem annotations, which can lead to inconsistencies
> and conflicts with subsequent patches.
> 
> Convert the screen base to a struct iosys_map as well for consistency
> and to avoid these issues.
> 
> Signed-off-by: Thierry Reding <treding at nvidia.com>
> ---
> Changes in v3:
> - properly reinitialize struct iosys_map to avoid bogus increments
> 
>   drivers/gpu/drm/tiny/simpledrm.c | 15 ++++++++-------
>   1 file changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c
> index 162eb44dcba8..3673a42e4bf4 100644
> --- a/drivers/gpu/drm/tiny/simpledrm.c
> +++ b/drivers/gpu/drm/tiny/simpledrm.c
> @@ -208,7 +208,7 @@ struct simpledrm_device {
>   	unsigned int pitch;
>   
>   	/* memory management */
> -	void __iomem *screen_base;
> +	struct iosys_map screen_base;
>   
>   	/* modesetting */
>   	uint32_t formats[8];
> @@ -492,15 +492,15 @@ static void simpledrm_primary_plane_helper_atomic_update(struct drm_plane *plane
>   
>   	drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
>   	drm_atomic_for_each_plane_damage(&iter, &damage) {
> -		struct iosys_map dst = IOSYS_MAP_INIT_VADDR(sdev->screen_base);

We use dst throughout the code for such destination buffers. Please keep 
the name. With this fixed, you can add

Reviewed-by: Thomas Zimmermann <tzimmermann at suse.de>

to the patch.

Best regards
Thomas

>   		struct drm_rect dst_clip = plane_state->dst;
> +		struct iosys_map screen = sdev->screen_base;
>   
>   		if (!drm_rect_intersect(&dst_clip, &damage))
>   			continue;
>   
> -		iosys_map_incr(&dst, drm_fb_clip_offset(sdev->pitch, sdev->format, &dst_clip));
> -		drm_fb_blit(&dst, &sdev->pitch, sdev->format->format, shadow_plane_state->data, fb,
> -			    &damage);
> +		iosys_map_incr(&screen, drm_fb_clip_offset(sdev->pitch, sdev->format, &dst_clip));
> +		drm_fb_blit(&screen, &sdev->pitch, sdev->format->format, shadow_plane_state->data,
> +			    fb, &damage);
>   	}
>   
>   	drm_dev_exit(idx);
> @@ -519,7 +519,7 @@ static void simpledrm_primary_plane_helper_atomic_disable(struct drm_plane *plan
>   		return;
>   
>   	/* Clear screen to black if disabled */
> -	memset_io(sdev->screen_base, 0, sdev->pitch * sdev->mode.vdisplay);
> +	iosys_map_memset(&sdev->screen_base, 0, 0, sdev->pitch * sdev->mode.vdisplay);
>   
>   	drm_dev_exit(idx);
>   }
> @@ -722,7 +722,8 @@ static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv,
>   	screen_base = devm_ioremap_wc(&pdev->dev, mem->start, resource_size(mem));
>   	if (!screen_base)
>   		return ERR_PTR(-ENOMEM);
> -	sdev->screen_base = screen_base;
> +
> +	iosys_map_set_vaddr_iomem(&sdev->screen_base, screen_base);
>   
>   	/*
>   	 * Modesetting

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