From patchwork Mon Oct 7 16:10:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Louis Chauvet X-Patchwork-Id: 13824993 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 D3F0CCFB449 for ; Mon, 7 Oct 2024 16:10:56 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9AB8110E3CC; Mon, 7 Oct 2024 16:10:53 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=bootlin.com header.i=@bootlin.com header.b="pZIUQoC/"; dkim-atps=neutral Received: from relay2-d.mail.gandi.net (relay2-d.mail.gandi.net [217.70.183.194]) by gabe.freedesktop.org (Postfix) with ESMTPS id B088C10E3CB for ; Mon, 7 Oct 2024 16:10:51 +0000 (UTC) Received: by mail.gandi.net (Postfix) with ESMTPSA id 2EBBE40006; Mon, 7 Oct 2024 16:10:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1728317450; 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=/rit4R7BfGzJp+BsDcAO2abNMYF5FXKvgrXhAznsmVw=; b=pZIUQoC/p6bFwSp/i3j9dqSAOzqs6FXKerwJkrR4eGIciYAou//dBzITnfr8DEjWk1+DDO VGhX6iqJOfAFKw0ICeJETUGU8f3ibUZKjHD1NgBPuWMHmzBpIhnZFSSWtQNeGPVDWmELmw 4dvQzRVQRtgJ4UsViiZw3m6f0PfmlwJVH8h/MQ6glhaSTiJxHs7H0b/DNEFMmOK21AZHo7 k1KWO1tGx8bAiX9YRxBmgeJTt1iDVlARoFubmlCloM4hwbECmJnv0lKPtL41wRB/tICnw2 6NGhNPRxUyXsuhbjRBij15hN2wMxkAeBpyEb4iF7hBvagHDuU6Yg/DH4w+mqWw== From: Louis Chauvet Date: Mon, 07 Oct 2024 18:10:37 +0200 Subject: [PATCH v12 03/15] drm/vkms: Add typedef and documentation for pixel_read and pixel_write functions MIME-Version: 1.0 Message-Id: <20241007-yuv-v12-3-01c1ada6fec8@bootlin.com> References: <20241007-yuv-v12-0-01c1ada6fec8@bootlin.com> In-Reply-To: <20241007-yuv-v12-0-01c1ada6fec8@bootlin.com> To: Rodrigo Siqueira , Melissa Wen , =?utf-8?q?Ma=C3=ADra_Canal?= , Haneen Mohammed , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Jonathan Corbet , Louis Chauvet , Simona Vetter , rdunlap@infradead.org, arthurgrillo@riseup.net, pekka.paalanen@haloniitty.fi, Simona Vetter Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, thomas.petazzoni@bootlin.com, jeremie.dautheribes@bootlin.com, miquel.raynal@bootlin.com, seanpaul@google.com, marcheu@google.com, nicolejadeyee@google.com, Pekka Paalanen X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=13183; i=louis.chauvet@bootlin.com; h=from:subject:message-id; bh=W6FmTSZbFCzM56Glzlm65mtmYDj+QUzKBDMqD0/Hjw4=; b=owEBbQKS/ZANAwAIASCtLsZbECziAcsmYgBnBAgAp0mBFqkdmvRwZI5BRrmGbLoJUzBtH1gOW bDeqdNiPJaJAjMEAAEIAB0WIQRPj7g/vng8MQxQWQQgrS7GWxAs4gUCZwQIAAAKCRAgrS7GWxAs 4tU9D/9miB2ZOfLoY1E20ThfxCsxSJTU8dIfjUVHa6pMX5j7RTOaLKSMeOhFDWPtKPQLb9P8xht TsYwioqQpoZFlHxD1/vV7c/PHidJBHsmn3k5JrcOnms1Uvv2JTtVfFVuWxkVq+MdoxMOqh7JVOV 85DD3O6BWkrv0N+uhiwmGzsy9Z5KCjonTSoW7U0sypStroEEKMEKIZIS6h81zNMuASj2HFK1G2d xFGgSHkX1S43QQ9zW+VWNgLLpWwmY7g+EjoeRXbWaYRLQRuHanmznqIi+zwd+DYoBBX5MIY9qF1 Gm65FkAuOAsxwAWJ1QjrGyNWmJqKvyBXUkC7DE9flqVv07Jz3+f5O9wHGD09cl81+FZGVBe5dNL cUjDkOlJZW/hI9TzdvEcz07yvMyWkxMVkwxVmvnBIQCVGijgdnjD+b+8BwPoDsZSJ6LJRMDDOMI KBkSsmP6kBJ+wCBN3poZ9nuakQatU5SAqvwn0EfvDvJyST9W0yHEbbUYmxcZwQ1RGuDTKRRsnIN aAfmlN2IPc7JWuchSXUCxfp4Fxn2eGSNYKfb5Bi/iV73euCZXqCNhHLNp+yy6/eOQHA0tBH7scD PnA1PQEUCbwjyChHiFrXNulkZrLFxgHRiYsPtMQkISjyqBNwlNsAN0T3fG6AKDqoJzZXtLWHEgf 0xQSYPN/aPgKOuQ== 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, 94 insertions(+), 59 deletions(-) diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h index fcb5a5ff7df7..e0d46defed83 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 @out_pixel + * 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 2a0fbe27d8b2..b9544e67cd4f 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) { - __le16 *pixels = (__force __le16 *)src_pixels; + __le16 *pixel = (__le16 *)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) { - __le16 *pixels = (__force __le16 *)src_pixels; + __le16 *pixel = (__le16 *)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) { - __le16 *pixels = (__force __le16 *)src_pixels; + __le16 *pixel = (__le16 *)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) { - __le16 *pixels = (__force __le16 *)dst_pixels; + __le16 *pixel = (__le16 *)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) { - __le16 *pixels = (__force __le16 *)dst_pixels; + __le16 *pixel = (__le16 *)out_pixel; - pixels[3] = cpu_to_le16(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] = cpu_to_le16(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) { - __le16 *pixels = (__force __le16 *)dst_pixels; + __le16 *pixel = (__le16 *)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); } /** @@ -259,13 +259,13 @@ void vkms_writeback_row(struct vkms_writeback_job *wb, } /** - * get_pixel_conversion_function() - Retrieve the correct read_pixel function for a specific + * get_pixel_read_function() - Retrieve the correct read_pixel function for a specific * format. The returned pointer is NULL for unsupported pixel formats. The caller must ensure that * the pointer is valid before using it in a vkms_plane_state. * * @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 +279,15 @@ 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 + */ + pr_err("Pixel format %p4cc is not supported by VKMS planes. This is a kernel bug, atomic check must forbid this configuration.\n", + &format); + BUG(); } } @@ -290,7 +298,7 @@ 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 +312,14 @@ 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 + */ + pr_err("Pixel format %p4cc is not supported by VKMS writeback. This is a kernel bug, atomic check must forbid this configuration.\n", + &format); + BUG(); } } 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,