From patchwork Wed Apr 27 18:16:32 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Noralf_Tr=C3=B8nnes?= X-Patchwork-Id: 8961491 Return-Path: X-Original-To: patchwork-dri-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id BD563BF29F for ; Wed, 27 Apr 2016 18:17:48 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9826820225 for ; Wed, 27 Apr 2016 18:17:47 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 751E12015A for ; Wed, 27 Apr 2016 18:17:46 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3AA206EBD8; Wed, 27 Apr 2016 18:17:31 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from asav21.altibox.net (asav21.altibox.net [109.247.116.8]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4D27C6EBCF for ; Wed, 27 Apr 2016 18:17:24 +0000 (UTC) Received: from localhost.localdomain (151.79-160-56.customer.lyse.net [79.160.56.151]) by asav21.altibox.net (Postfix) with ESMTP id B5D4280298; Wed, 27 Apr 2016 20:17:21 +0200 (CEST) From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= To: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org Subject: [PATCH v3 3/7] drm/fb-helper: Add fb_deferred_io support Date: Wed, 27 Apr 2016 20:16:32 +0200 Message-Id: <1461780996-8612-4-git-send-email-noralf@tronnes.org> X-Mailer: git-send-email 2.2.2 In-Reply-To: <1461780996-8612-1-git-send-email-noralf@tronnes.org> References: <1461780996-8612-1-git-send-email-noralf@tronnes.org> MIME-Version: 1.0 X-CMAE-Score: 0 X-CMAE-Analysis: v=2.1 cv=VqODe7Cn c=1 sm=1 tr=0 a=gFHx44SYZz5JQKQKbGEAEQ==:117 a=gFHx44SYZz5JQKQKbGEAEQ==:17 a=L9H7d07YOLsA:10 a=9cW_t1CCXrUA:10 a=s5jvgZ67dGcA:10 a=IkcTkHD0fZMA:10 a=SJz97ENfAAAA:8 a=eYSg8l73AMRG-NhhayAA:9 a=n4tIpwJ2a5lCC3jp:21 a=W04HXLBFbE4myX20:21 a=QEXdDO2ut3YA:10 Cc: tomi.valkeinen@ti.com, laurent.pinchart@ideasonboard.com, linux-kernel@vger.kernel.org X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 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" X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This adds deferred io support to drm_fb_helper. The fbdev framebuffer changes are flushed using the callback (struct drm_framebuffer *)->funcs->dirty() by a dedicated worker ensuring that it always runs in process context. Signed-off-by: Noralf Trønnes Reviewed-by: Daniel Vetter --- Changes since v2: - FB_DEFERRED_IO is now always selected by DRM_KMS_FB_HELPER, ifdef removed - The drm_clip_rect utility functions are dropped, so open code it - docs: use & to denote structs Changes since v1: - Use a dedicated worker to run the framebuffer flushing like qxl does - Add parameter descriptions to drm_fb_helper_deferred_io drivers/gpu/drm/Kconfig | 1 + drivers/gpu/drm/drm_fb_helper.c | 109 +++++++++++++++++++++++++++++++++++++++- include/drm/drm_fb_helper.h | 15 ++++++ 3 files changed, 124 insertions(+), 1 deletion(-) -- 2.2.2 diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 9e4f2f1..8e6f34b 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -52,6 +52,7 @@ config DRM_KMS_FB_HELPER select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT + select FB_DEFERRED_IO help FBDEV helpers for KMS drivers. diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 855108e..5112b5d 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -48,6 +48,8 @@ MODULE_PARM_DESC(fbdev_emulation, static LIST_HEAD(kernel_fb_helper_list); +static void drm_fb_helper_dirty_init(struct drm_fb_helper *helper); + /** * DOC: fbdev helpers * @@ -84,6 +86,15 @@ static LIST_HEAD(kernel_fb_helper_list); * and set up an initial configuration using the detected hardware, drivers * should call drm_fb_helper_single_add_all_connectors() followed by * drm_fb_helper_initial_config(). + * + * If CONFIG_FB_DEFERRED_IO is enabled and &drm_framebuffer_funcs ->dirty is + * set, the drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} + * functions will accumulate changes and schedule &fb_helper .dirty_work to run + * right away. This worker then calls the dirty() function ensuring that it + * will always run in process context since the fb_*() function could be + * running in atomic context. If drm_fb_helper_deferred_io() is used as the + * deferred_io callback it will also schedule dirty_work with the damage + * collected from the mmap page writes. */ /** @@ -650,6 +661,7 @@ void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper, const struct drm_fb_helper_funcs *funcs) { INIT_LIST_HEAD(&helper->kernel_fb_list); + drm_fb_helper_dirty_init(helper); helper->funcs = funcs; helper->dev = dev; } @@ -834,6 +846,82 @@ void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) } EXPORT_SYMBOL(drm_fb_helper_unlink_fbi); +static void drm_fb_helper_dirty_work(struct work_struct *work) +{ + struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, + dirty_work); + struct drm_clip_rect *clip = &helper->dirty_clip; + struct drm_clip_rect clip_copy; + unsigned long flags; + + spin_lock_irqsave(&helper->dirty_lock, flags); + clip_copy = *clip; + clip->x1 = clip->y1 = ~0; + clip->x2 = clip->y2 = 0; + spin_unlock_irqrestore(&helper->dirty_lock, flags); + + helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1); +} + +static void drm_fb_helper_dirty_init(struct drm_fb_helper *helper) +{ + spin_lock_init(&helper->dirty_lock); + INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work); + helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0; +} + +static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y, + u32 width, u32 height) +{ + struct drm_fb_helper *helper = info->par; + struct drm_clip_rect *clip = &helper->dirty_clip; + unsigned long flags; + + if (!helper->fb->funcs->dirty) + return; + + spin_lock_irqsave(&helper->dirty_lock, flags); + clip->x1 = min_t(u32, clip->x1, x); + clip->y1 = min_t(u32, clip->y1, y); + clip->x2 = max_t(u32, clip->x2, x + width); + clip->y2 = max_t(u32, clip->y2, y + height); + spin_unlock_irqrestore(&helper->dirty_lock, flags); + + schedule_work(&helper->dirty_work); +} + +/** + * drm_fb_helper_deferred_io() - fbdev deferred_io callback function + * @info: fb_info struct pointer + * @pagelist: list of dirty mmap framebuffer pages + * + * This function is used as the &fb_deferred_io ->deferred_io + * callback function for flushing the fbdev mmap writes. + */ +void drm_fb_helper_deferred_io(struct fb_info *info, + struct list_head *pagelist) +{ + unsigned long start, end, min, max; + struct page *page; + u32 y1, y2; + + min = ULONG_MAX; + max = 0; + list_for_each_entry(page, pagelist, lru) { + start = page->index << PAGE_SHIFT; + end = start + PAGE_SIZE - 1; + min = min(min, start); + max = max(max, end); + } + + if (min < max) { + y1 = min / info->fix.line_length; + y2 = min_t(u32, max / info->fix.line_length, info->var.yres); + drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1); + } +} +EXPORT_SYMBOL(drm_fb_helper_deferred_io); + /** * drm_fb_helper_sys_read - wrapper around fb_sys_read * @info: fb_info struct pointer @@ -862,7 +950,14 @@ EXPORT_SYMBOL(drm_fb_helper_sys_read); ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf, size_t count, loff_t *ppos) { - return fb_sys_write(info, buf, count, ppos); + ssize_t ret; + + ret = fb_sys_write(info, buf, count, ppos); + if (ret > 0) + drm_fb_helper_dirty(info, 0, 0, info->var.xres, + info->var.yres); + + return ret; } EXPORT_SYMBOL(drm_fb_helper_sys_write); @@ -877,6 +972,8 @@ void drm_fb_helper_sys_fillrect(struct fb_info *info, const struct fb_fillrect *rect) { sys_fillrect(info, rect); + drm_fb_helper_dirty(info, rect->dx, rect->dy, + rect->width, rect->height); } EXPORT_SYMBOL(drm_fb_helper_sys_fillrect); @@ -891,6 +988,8 @@ void drm_fb_helper_sys_copyarea(struct fb_info *info, const struct fb_copyarea *area) { sys_copyarea(info, area); + drm_fb_helper_dirty(info, area->dx, area->dy, + area->width, area->height); } EXPORT_SYMBOL(drm_fb_helper_sys_copyarea); @@ -905,6 +1004,8 @@ void drm_fb_helper_sys_imageblit(struct fb_info *info, const struct fb_image *image) { sys_imageblit(info, image); + drm_fb_helper_dirty(info, image->dx, image->dy, + image->width, image->height); } EXPORT_SYMBOL(drm_fb_helper_sys_imageblit); @@ -919,6 +1020,8 @@ void drm_fb_helper_cfb_fillrect(struct fb_info *info, const struct fb_fillrect *rect) { cfb_fillrect(info, rect); + drm_fb_helper_dirty(info, rect->dx, rect->dy, + rect->width, rect->height); } EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect); @@ -933,6 +1036,8 @@ void drm_fb_helper_cfb_copyarea(struct fb_info *info, const struct fb_copyarea *area) { cfb_copyarea(info, area); + drm_fb_helper_dirty(info, area->dx, area->dy, + area->width, area->height); } EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea); @@ -947,6 +1052,8 @@ void drm_fb_helper_cfb_imageblit(struct fb_info *info, const struct fb_image *image) { cfb_imageblit(info, image); + drm_fb_helper_dirty(info, image->dx, image->dy, + image->width, image->height); } EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit); diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h index 062723b..5b4aa35 100644 --- a/include/drm/drm_fb_helper.h +++ b/include/drm/drm_fb_helper.h @@ -172,6 +172,10 @@ struct drm_fb_helper_connector { * @funcs: driver callbacks for fb helper * @fbdev: emulated fbdev device info struct * @pseudo_palette: fake palette of 16 colors + * @dirty_clip: clip rectangle used with deferred_io to accumulate damage to + * the screen buffer + * @dirty_lock: spinlock protecting @dirty_clip + * @dirty_work: worker used to flush the framebuffer * * This is the main structure used by the fbdev helpers. Drivers supporting * fbdev emulation should embedded this into their overall driver structure. @@ -189,6 +193,9 @@ struct drm_fb_helper { const struct drm_fb_helper_funcs *funcs; struct fb_info *fbdev; u32 pseudo_palette[17]; + struct drm_clip_rect dirty_clip; + spinlock_t dirty_lock; + struct work_struct dirty_work; /** * @kernel_fb_list: @@ -245,6 +252,9 @@ void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper); +void drm_fb_helper_deferred_io(struct fb_info *info, + struct list_head *pagelist); + ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf, size_t count, loff_t *ppos); ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf, @@ -368,6 +378,11 @@ static inline void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) { } +static inline void drm_fb_helper_deferred_io(struct fb_info *info, + struct list_head *pagelist) +{ +} + static inline ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf, size_t count, loff_t *ppos)