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Date: Wed, 27 Mar 2024 12:03:25 -0300
From: Maíra Canal <mcanal@...lia.com>
To: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>,
Melissa Wen <melissa.srw@...il.com>,
Haneen Mohammed <hamohammed.sa@...il.com>, Daniel Vetter <daniel@...ll.ch>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, arthurgrillo@...eup.net,
Jonathan Corbet <corbet@....net>, pekka.paalanen@...oniitty.fi,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
jeremie.dautheribes@...tlin.com, miquel.raynal@...tlin.com,
thomas.petazzoni@...tlin.com, seanpaul@...gle.com, marcheu@...gle.com,
nicolejadeyee@...gle.com
Subject: Re: [PATCH v5 04/16] drm/vkms: Add typedef and documentation for
pixel_read and pixel_write functions
On 3/26/24 12:56, Louis Chauvet wrote:
> Le 25/03/24 - 10:56, Maíra Canal a écrit :
>> On 3/13/24 14:44, Louis Chauvet wrote:
>>> Introduce two typedefs: pixel_read_t and pixel_write_t. It allows the
>>> compiler to check if the passed functions take the correct arguments.
>>> Such typedefs will help ensuring consistency across the code base in
>>> case of update of these prototypes.
>>>
>>> Rename input/output variable in a consistent way between read_line and
>>> write_line.
>>>
>>> A warn has been added in get_pixel_*_function to alert when an unsupported
>>> pixel format is requested. As those formats are checked before
>>> atomic_update callbacks, it should never append.
>>>
>>> Document for those typedefs.
>>>
>>> Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
>>> ---
>>> drivers/gpu/drm/vkms/vkms_drv.h | 23 ++++++-
>>> drivers/gpu/drm/vkms/vkms_formats.c | 124 +++++++++++++++++++++---------------
>>> drivers/gpu/drm/vkms/vkms_formats.h | 4 +-
>>> drivers/gpu/drm/vkms/vkms_plane.c | 2 +-
>>> 4 files changed, 95 insertions(+), 58 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
>>> index 18086423a3a7..4bfc62d26f08 100644
>>> --- a/drivers/gpu/drm/vkms/vkms_drv.h
>>> +++ b/drivers/gpu/drm/vkms/vkms_drv.h
>>> @@ -53,12 +53,31 @@ struct line_buffer {
>>> struct pixel_argb_u16 *pixels;
>>> };
>>>
>>> +/**
>>> + * typedef pixel_write_t - These functions are used to read a pixel from a
>>> + * `struct pixel_argb_u16*`, convert it in a specific format and write it in the @dst_pixels
>>> + * buffer.
>>
>> Your brief description looks a bit big to me. Also, take a look at the
>> cross-references docs [1].
>
> Is this description sufficient?
>
> typedef pixel_write_t - Convert a pixel from a &struct pixel_argb_u16 into a specific format
Yeah.
Best Regards,
- Maíra
>
>> [1]
>> https://docs.kernel.org/doc-guide/kernel-doc.html#highlights-and-cross-references
>>
>>> + *
>>> + * @out_pixel: destination address to write the pixel
>>> + * @in_pixel: pixel to write
>>> + */
>>> +typedef void (*pixel_write_t)(u8 *out_pixel, struct pixel_argb_u16 *in_pixel);
>>> +
>>> struct vkms_writeback_job {
>>> struct iosys_map data[DRM_FORMAT_MAX_PLANES];
>>> struct vkms_frame_info wb_frame_info;
>>> - void (*pixel_write)(u8 *dst_pixels, struct pixel_argb_u16 *in_pixel);
>>> + pixel_write_t pixel_write;
>>> };
>>>
>>> +/**
>>> + * typedef pixel_read_t - These functions are used to read a pixel in the source frame,
>>> + * convert it to `struct pixel_argb_u16` and write it to @out_pixel.
>>
>> Same.
>
> typedef pixel_read_t - Read a pixel and convert it to a &struct pixel_argb_u16
>
>>> + *
>>> + * @in_pixel: Pointer to the pixel to read
>>> + * @out_pixel: Pointer to write the converted pixel
>>
>> s/Pointer/pointer
>
> Fixed in v6.
>
>>> + */
>>> +typedef void (*pixel_read_t)(u8 *in_pixel, struct pixel_argb_u16 *out_pixel);
>>> +
>>> /**
>>> * vkms_plane_state - Driver specific plane state
>>> * @base: base plane state
>>> @@ -69,7 +88,7 @@ struct vkms_writeback_job {
>>> struct vkms_plane_state {
>>> struct drm_shadow_plane_state base;
>>> struct vkms_frame_info *frame_info;
>>> - void (*pixel_read)(u8 *src_buffer, struct pixel_argb_u16 *out_pixel);
>>> + pixel_read_t pixel_read;
>>> };
>>>
>>> struct vkms_plane {
>>> diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c
>>> index 6e3dc8682ff9..55a4365d21a4 100644
>>> --- a/drivers/gpu/drm/vkms/vkms_formats.c
>>> +++ b/drivers/gpu/drm/vkms/vkms_formats.c
>>> @@ -76,7 +76,7 @@ static int get_x_position(const struct vkms_frame_info *frame_info, int limit, i
>>> * They are used in the `vkms_compose_row` function to handle multiple formats.
>>> */
>>>
>>> -static void ARGB8888_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel)
>>> +static void ARGB8888_to_argb_u16(u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
>>> {
>>> /*
>>> * The 257 is the "conversion ratio". This number is obtained by the
>>> @@ -84,48 +84,48 @@ static void ARGB8888_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixe
>>> * the best color value in a pixel format with more possibilities.
>>> * A similar idea applies to others RGB color conversions.
>>> */
>>> - out_pixel->a = (u16)src_pixels[3] * 257;
>>> - out_pixel->r = (u16)src_pixels[2] * 257;
>>> - out_pixel->g = (u16)src_pixels[1] * 257;
>>> - out_pixel->b = (u16)src_pixels[0] * 257;
>>> + out_pixel->a = (u16)in_pixel[3] * 257;
>>> + out_pixel->r = (u16)in_pixel[2] * 257;
>>> + out_pixel->g = (u16)in_pixel[1] * 257;
>>> + out_pixel->b = (u16)in_pixel[0] * 257;
>>> }
>>>
>>> -static void XRGB8888_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel)
>>> +static void XRGB8888_to_argb_u16(u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
>>> {
>>> out_pixel->a = (u16)0xffff;
>>> - out_pixel->r = (u16)src_pixels[2] * 257;
>>> - out_pixel->g = (u16)src_pixels[1] * 257;
>>> - out_pixel->b = (u16)src_pixels[0] * 257;
>>> + out_pixel->r = (u16)in_pixel[2] * 257;
>>> + out_pixel->g = (u16)in_pixel[1] * 257;
>>> + out_pixel->b = (u16)in_pixel[0] * 257;
>>> }
>>>
>>> -static void ARGB16161616_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel)
>>> +static void ARGB16161616_to_argb_u16(u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
>>> {
>>> - u16 *pixels = (u16 *)src_pixels;
>>> + u16 *pixel = (u16 *)in_pixel;
>>>
>>> - out_pixel->a = le16_to_cpu(pixels[3]);
>>> - out_pixel->r = le16_to_cpu(pixels[2]);
>>> - out_pixel->g = le16_to_cpu(pixels[1]);
>>> - out_pixel->b = le16_to_cpu(pixels[0]);
>>> + out_pixel->a = le16_to_cpu(pixel[3]);
>>> + out_pixel->r = le16_to_cpu(pixel[2]);
>>> + out_pixel->g = le16_to_cpu(pixel[1]);
>>> + out_pixel->b = le16_to_cpu(pixel[0]);
>>> }
>>>
>>> -static void XRGB16161616_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel)
>>> +static void XRGB16161616_to_argb_u16(u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
>>> {
>>> - u16 *pixels = (u16 *)src_pixels;
>>> + u16 *pixel = (u16 *)in_pixel;
>>>
>>> out_pixel->a = (u16)0xffff;
>>> - out_pixel->r = le16_to_cpu(pixels[2]);
>>> - out_pixel->g = le16_to_cpu(pixels[1]);
>>> - out_pixel->b = le16_to_cpu(pixels[0]);
>>> + out_pixel->r = le16_to_cpu(pixel[2]);
>>> + out_pixel->g = le16_to_cpu(pixel[1]);
>>> + out_pixel->b = le16_to_cpu(pixel[0]);
>>> }
>>>
>>> -static void RGB565_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel)
>>> +static void RGB565_to_argb_u16(u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
>>> {
>>> - u16 *pixels = (u16 *)src_pixels;
>>> + u16 *pixel = (u16 *)in_pixel;
>>>
>>> s64 fp_rb_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(31));
>>> s64 fp_g_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(63));
>>>
>>> - u16 rgb_565 = le16_to_cpu(*pixels);
>>> + u16 rgb_565 = le16_to_cpu(*pixel);
>>> s64 fp_r = drm_int2fixp((rgb_565 >> 11) & 0x1f);
>>> s64 fp_g = drm_int2fixp((rgb_565 >> 5) & 0x3f);
>>> s64 fp_b = drm_int2fixp(rgb_565 & 0x1f);
>>> @@ -169,12 +169,12 @@ void vkms_compose_row(struct line_buffer *stage_buffer, struct vkms_plane_state
>>>
>>> /*
>>> * The following functions take one argb_u16 pixel and convert it to a specific format. The
>>> - * result is stored in @dst_pixels.
>>> + * result is stored in @out_pixel.
>>> *
>>> * They are used in the `vkms_writeback_row` to convert and store a pixel from the src_buffer to
>>> * the writeback buffer.
>>> */
>>> -static void argb_u16_to_ARGB8888(u8 *dst_pixels, struct pixel_argb_u16 *in_pixel)
>>> +static void argb_u16_to_ARGB8888(u8 *out_pixel, struct pixel_argb_u16 *in_pixel)
>>> {
>>> /*
>>> * This sequence below is important because the format's byte order is
>>> @@ -186,43 +186,43 @@ static void argb_u16_to_ARGB8888(u8 *dst_pixels, struct pixel_argb_u16 *in_pixel
>>> * | Addr + 2 | = Red channel
>>> * | Addr + 3 | = Alpha channel
>>> */
>>> - dst_pixels[3] = DIV_ROUND_CLOSEST(in_pixel->a, 257);
>>> - dst_pixels[2] = DIV_ROUND_CLOSEST(in_pixel->r, 257);
>>> - dst_pixels[1] = DIV_ROUND_CLOSEST(in_pixel->g, 257);
>>> - dst_pixels[0] = DIV_ROUND_CLOSEST(in_pixel->b, 257);
>>> + out_pixel[3] = DIV_ROUND_CLOSEST(in_pixel->a, 257);
>>> + out_pixel[2] = DIV_ROUND_CLOSEST(in_pixel->r, 257);
>>> + out_pixel[1] = DIV_ROUND_CLOSEST(in_pixel->g, 257);
>>> + out_pixel[0] = DIV_ROUND_CLOSEST(in_pixel->b, 257);
>>> }
>>>
>>> -static void argb_u16_to_XRGB8888(u8 *dst_pixels, struct pixel_argb_u16 *in_pixel)
>>> +static void argb_u16_to_XRGB8888(u8 *out_pixel, struct pixel_argb_u16 *in_pixel)
>>> {
>>> - dst_pixels[3] = 0xff;
>>> - dst_pixels[2] = DIV_ROUND_CLOSEST(in_pixel->r, 257);
>>> - dst_pixels[1] = DIV_ROUND_CLOSEST(in_pixel->g, 257);
>>> - dst_pixels[0] = DIV_ROUND_CLOSEST(in_pixel->b, 257);
>>> + out_pixel[3] = 0xff;
>>> + out_pixel[2] = DIV_ROUND_CLOSEST(in_pixel->r, 257);
>>> + out_pixel[1] = DIV_ROUND_CLOSEST(in_pixel->g, 257);
>>> + out_pixel[0] = DIV_ROUND_CLOSEST(in_pixel->b, 257);
>>> }
>>>
>>> -static void argb_u16_to_ARGB16161616(u8 *dst_pixels, struct pixel_argb_u16 *in_pixel)
>>> +static void argb_u16_to_ARGB16161616(u8 *out_pixel, struct pixel_argb_u16 *in_pixel)
>>> {
>>> - u16 *pixels = (u16 *)dst_pixels;
>>> + u16 *pixel = (u16 *)out_pixel;
>>>
>>> - pixels[3] = cpu_to_le16(in_pixel->a);
>>> - pixels[2] = cpu_to_le16(in_pixel->r);
>>> - pixels[1] = cpu_to_le16(in_pixel->g);
>>> - pixels[0] = cpu_to_le16(in_pixel->b);
>>> + pixel[3] = cpu_to_le16(in_pixel->a);
>>> + pixel[2] = cpu_to_le16(in_pixel->r);
>>> + pixel[1] = cpu_to_le16(in_pixel->g);
>>> + pixel[0] = cpu_to_le16(in_pixel->b);
>>> }
>>>
>>> -static void argb_u16_to_XRGB16161616(u8 *dst_pixels, struct pixel_argb_u16 *in_pixel)
>>> +static void argb_u16_to_XRGB16161616(u8 *out_pixel, struct pixel_argb_u16 *in_pixel)
>>> {
>>> - u16 *pixels = (u16 *)dst_pixels;
>>> + u16 *pixel = (u16 *)out_pixel;
>>>
>>> - pixels[3] = 0xffff;
>>> - pixels[2] = cpu_to_le16(in_pixel->r);
>>> - pixels[1] = cpu_to_le16(in_pixel->g);
>>> - pixels[0] = cpu_to_le16(in_pixel->b);
>>> + pixel[3] = 0xffff;
>>> + pixel[2] = cpu_to_le16(in_pixel->r);
>>> + pixel[1] = cpu_to_le16(in_pixel->g);
>>> + pixel[0] = cpu_to_le16(in_pixel->b);
>>> }
>>>
>>> -static void argb_u16_to_RGB565(u8 *dst_pixels, struct pixel_argb_u16 *in_pixel)
>>> +static void argb_u16_to_RGB565(u8 *out_pixel, struct pixel_argb_u16 *in_pixel)
>>> {
>>> - u16 *pixels = (u16 *)dst_pixels;
>>> + u16 *pixel = (u16 *)out_pixel;
>>>
>>> s64 fp_rb_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(31));
>>> s64 fp_g_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(63));
>>> @@ -235,7 +235,7 @@ static void argb_u16_to_RGB565(u8 *dst_pixels, struct pixel_argb_u16 *in_pixel)
>>> u16 g = drm_fixp2int(drm_fixp_div(fp_g, fp_g_ratio));
>>> u16 b = drm_fixp2int(drm_fixp_div(fp_b, fp_rb_ratio));
>>>
>>> - *pixels = cpu_to_le16(r << 11 | g << 5 | b);
>>> + *pixel = cpu_to_le16(r << 11 | g << 5 | b);
>>> }
>>>
>>> /**
>>> @@ -266,7 +266,7 @@ void vkms_writeback_row(struct vkms_writeback_job *wb,
>>> *
>>> * @format: DRM_FORMAT_* value for which to obtain a conversion function (see [drm_fourcc.h])
>>> */
>>> -void *get_pixel_conversion_function(u32 format)
>>> +pixel_read_t get_pixel_read_function(u32 format)
>>> {
>>> switch (format) {
>>> case DRM_FORMAT_ARGB8888:
>>> @@ -280,7 +280,16 @@ void *get_pixel_conversion_function(u32 format)
>>> case DRM_FORMAT_RGB565:
>>> return &RGB565_to_argb_u16;
>>> default:
>>> - return NULL;
>>> + /*
>>> + * This is a bug in vkms_plane_atomic_check. All the supported
>>
>> s/vkms_plane_atomic_check/vkms_plane_atomic_check()
>
> Fixed in v6.
>
> Thanks,
> Louis Chauvet
>
>> Best Regards,
>> - Maíra
>>
>>> + * format must:
>>> + * - Be listed in vkms_formats in vkms_plane.c
>>> + * - Have a pixel_read callback defined here
>>> + */
>>> + WARN(true,
>>> + "Pixel format %p4cc is not supported by VKMS planes. This is a kernel bug, atomic check must forbid this configuration.\n",
>>> + &format);
>>> + return (pixel_read_t)NULL;
>>> }
>>> }
>>>
>>> @@ -291,7 +300,7 @@ void *get_pixel_conversion_function(u32 format)
>>> *
>>> * @format: DRM_FORMAT_* value for which to obtain a conversion function (see [drm_fourcc.h])
>>> */
>>> -void *get_pixel_write_function(u32 format)
>>> +pixel_write_t get_pixel_write_function(u32 format)
>>> {
>>> switch (format) {
>>> case DRM_FORMAT_ARGB8888:
>>> @@ -305,6 +314,15 @@ void *get_pixel_write_function(u32 format)
>>> case DRM_FORMAT_RGB565:
>>> return &argb_u16_to_RGB565;
>>> default:
>>> - return NULL;
>>> + /*
>>> + * This is a bug in vkms_writeback_atomic_check. All the supported
>>> + * format must:
>>> + * - Be listed in vkms_wb_formats in vkms_writeback.c
>>> + * - Have a pixel_write callback defined here
>>> + */
>>> + WARN(true,
>>> + "Pixel format %p4cc is not supported by VKMS writeback. This is a kernel bug, atomic check must forbid this configuration.\n",
>>> + &format);
>>> + return (pixel_write_t)NULL;
>>> }
>>> }
>>> diff --git a/drivers/gpu/drm/vkms/vkms_formats.h b/drivers/gpu/drm/vkms/vkms_formats.h
>>> index cf59c2ed8e9a..3ecea4563254 100644
>>> --- a/drivers/gpu/drm/vkms/vkms_formats.h
>>> +++ b/drivers/gpu/drm/vkms/vkms_formats.h
>>> @@ -5,8 +5,8 @@
>>>
>>> #include "vkms_drv.h"
>>>
>>> -void *get_pixel_conversion_function(u32 format);
>>> +pixel_read_t get_pixel_read_function(u32 format);
>>>
>>> -void *get_pixel_write_function(u32 format);
>>> +pixel_write_t get_pixel_write_function(u32 format);
>>>
>>> #endif /* _VKMS_FORMATS_H_ */
>>> diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
>>> index 21b5adfb44aa..10e9b23dab28 100644
>>> --- a/drivers/gpu/drm/vkms/vkms_plane.c
>>> +++ b/drivers/gpu/drm/vkms/vkms_plane.c
>>> @@ -125,7 +125,7 @@ static void vkms_plane_atomic_update(struct drm_plane *plane,
>>> drm_rect_rotate(&frame_info->rotated, drm_rect_width(&frame_info->rotated),
>>> drm_rect_height(&frame_info->rotated), frame_info->rotation);
>>>
>>> - vkms_plane_state->pixel_read = get_pixel_conversion_function(fmt);
>>> + vkms_plane_state->pixel_read = get_pixel_read_function(fmt);
>>> }
>>>
>>> static int vkms_plane_atomic_check(struct drm_plane *plane,
>>>
>
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