From patchwork Mon May 13 07:50:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Louis Chauvet X-Patchwork-Id: 13663121 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 69E6BC25B10 for ; Mon, 13 May 2024 07:50:48 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8800010E4A1; Mon, 13 May 2024 07:50:45 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=bootlin.com header.i=@bootlin.com header.b="PcFAkeeG"; dkim-atps=neutral Received: from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net [217.70.183.200]) by gabe.freedesktop.org (Postfix) with ESMTPS id 42DF410E496 for ; Mon, 13 May 2024 07:50:41 +0000 (UTC) Received: by mail.gandi.net (Postfix) with ESMTPSA id 8813C20011; Mon, 13 May 2024 07:50:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1715586639; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8T+CH9fPCLxd/0GLo4dTdn0ePOm54Xw2qliNiIg+VfQ=; b=PcFAkeeG79B+IHOubG+AxXRLStV7trMNC82SNOo/lY5ZjjgfJO1+BxmfEX4U2Dnv8e3NIJ kaBIDHJ92CyiI5xL/4aQsi7mUvjMh9B8dSTZ28Nax6+Ejz+d9iiJSJ6Sfs73WrKIXKlIic 4n14EXHn9Dd8X9Gf8NTSJez6ImMsb6JASyKYmuJ45nA+R5F2KTkZ3rCPc1xwAjXj3kWSya qSop/CASH89ErH0hX9X5W05NpUZVs8EsR8HD/K256roQQhAzog1B94RDqsiZByvqXPTP9T VmRmMHhTEi3ETwCfUizxIzI9XP9GapkX3IxvuXzQCnKaXupoNn30GAshFNdSOw== From: Louis Chauvet Date: Mon, 13 May 2024 09:50:25 +0200 Subject: [PATCH v7 04/17] drm/vkms: Add typedef and documentation for pixel_read and pixel_write functions MIME-Version: 1.0 Message-Id: <20240513-yuv-v7-4-380e9ffec502@bootlin.com> References: <20240513-yuv-v7-0-380e9ffec502@bootlin.com> In-Reply-To: <20240513-yuv-v7-0-380e9ffec502@bootlin.com> To: Rodrigo Siqueira , Melissa Wen , =?utf-8?q?Ma=C3=ADra_Canal?= , Haneen Mohammed , Daniel Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , rdunlap@infradead.org, arthurgrillo@riseup.net, Jonathan Corbet , pekka.paalanen@haloniitty.fi Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, jeremie.dautheribes@bootlin.com, miquel.raynal@bootlin.com, thomas.petazzoni@bootlin.com, seanpaul@google.com, marcheu@google.com, nicolejadeyee@google.com, Louis Chauvet , Pekka Paalanen X-Mailer: b4 0.14-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=12736; i=louis.chauvet@bootlin.com; h=from:subject:message-id; bh=5RlLNz0GkeJYeWxKZ5PFVsn5quQZl9s1HO0QVMvDK1I=; b=owEBbQKS/ZANAwAIASCtLsZbECziAcsmYgBmQcZC/tIBwqCtQaMxsWjKINLOVM5op/E2fnaEK iwFNpYIqKCJAjMEAAEIAB0WIQRPj7g/vng8MQxQWQQgrS7GWxAs4gUCZkHGQgAKCRAgrS7GWxAs 4lQzD/0Ue0D2uuOtnxWZrikxi2geq7Y5c7k6qs0yyqGfsO989KJN1W3x1P8M926UkxWYBk/iz3K PnU0Bj0j91URYUjkU+Ist1rHwot21bQhfHhkYKVpCXLK6q4InVvXNGgnuARkGApCO/eTQxZFl6N izv0/Les74SJDBeIrPIRHeNeXfm8bjI9nPf7fEacGNbHmYbaiE/txY14Fg0BwWvMBdtEwTxGvvt adJjwd0zfevnqVbSOoyt19Ll5EP3wpKmh33NgqjHdLgy0Ozs3unVX75RijDXmJ+ZujNzm1CPa8o ryaXDFxchO2k8zS5nLoOm6DxPDp06vNloe7HKdG3umCFbLIAHdOsM/HMt21hN9+QhQKtYEb1uDx fh8SSGp5zEzS7AjvFCsBrOUaRQU1AdEnTE6y8QKOiLO6iWY973xtASRWO8uLPqUeLapAinMEGXI OgVKhzD5E9tqDdLuOOLEYDc2bfWyrxUAWUu7KeyPg87ERYrf+fB9m6hjEvrug9z138AITBntWlQ +0PhJDK2ZqUtli/tZvQIGQwB0SKxRVC3jZD/VdZwr0tOOZb4Ra+PoTAJPVwHloYjBlCZ9NwQ9ew Zk60xPzSUUVP/zzwID1lWODNzfavgQ17QK8tc1FtZpWbF5aL0HZ/SE2S8ea3athB9gdr6itciul wT1dSphOVYAgDaw== X-Developer-Key: i=louis.chauvet@bootlin.com; a=openpgp; fpr=8B7104AE9A272D6693F527F2EC1883F55E0B40A5 X-GND-Sasl: louis.chauvet@bootlin.com X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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 happen. Document for those typedefs. Reviewed-by: Pekka Paalanen Signed-off-by: Louis Chauvet --- 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 212f4ab6a71f..b1542b83b090 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. + * + * @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. + * + * @in_pixel: pointer to the pixel to read + * @out_pixel: pointer to write the converted pixel + */ +typedef void (*pixel_read_t)(u8 *in_pixel, struct pixel_argb_u16 *out_pixel); + /** * struct 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 f157c43da4d6..6b3e17374b19 100644 --- a/drivers/gpu/drm/vkms/vkms_formats.c +++ b/drivers/gpu/drm/vkms/vkms_formats.c @@ -75,7 +75,7 @@ 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 @@ -83,48 +83,48 @@ 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); @@ -168,12 +168,12 @@ void vkms_compose_row(struct line_buffer *stage_buffer, struct vkms_plane_state /* * The following functions take one &struct pixel_argb_u16 and convert it to a specific format. - * The result is stored in @dst_pixels. + * The result is stored in @out_pixel. * * They are used in 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 @@ -185,43 +185,43 @@ 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)); @@ -234,7 +234,7 @@ 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); } /** @@ -265,7 +265,7 @@ 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: @@ -279,7 +279,16 @@ 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 + * 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; } } @@ -290,7 +299,7 @@ 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: @@ -304,6 +313,15 @@ 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,