From patchwork Mon Sep 25 07:26:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 13397360 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 A0857CE7A89 for ; Mon, 25 Sep 2023 07:33:39 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2D1B010E1ED; Mon, 25 Sep 2023 07:33:25 +0000 (UTC) Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by gabe.freedesktop.org (Postfix) with ESMTPS id B6B6D10E159; Mon, 25 Sep 2023 07:33:21 +0000 (UTC) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 3D1761F750; Mon, 25 Sep 2023 07:33:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1695627200; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BuRSgGOeVA1AzkOiLqWyOy6Fmr3WYU5Sktsi5uGfV1M=; b=f6FGwhkZeooQdtBgP8eS8JdrlBif3trjnBG2c6IATxxk9lKn897r/5WE3hRpn+W2diDtgn ka8O5tYn3Yr8TcJusnqqUJNQsrhcfLIC2klt67v1thfaittwA9j+aWqJDEb0OJdQqMbBDT Ik+Ud60cxeFcn0vcA1sAxWIAV/TLxBI= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1695627200; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BuRSgGOeVA1AzkOiLqWyOy6Fmr3WYU5Sktsi5uGfV1M=; b=xP5M52p+/E2StCBQd/LuawlMEs++bIP3t8DPlvAuVxqyes/V/foAs9MwkqhWXw0/9Rh0nh HThlUrySnIPkNQCQ== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id E644013A8D; Mon, 25 Sep 2023 07:33:19 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id mA1zN783EWVyPQAAMHmgww (envelope-from ); Mon, 25 Sep 2023 07:33:19 +0000 From: Thomas Zimmermann To: jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com, rodrigo.vivi@intel.com, tvrtko.ursulin@linux.intel.com, ville.syrjala@linux.intel.com, imre.deak@intel.com, tejas.upadhyay@intel.com, javierm@redhat.com, airlied@gmail.com, daniel@ffwll.ch Date: Mon, 25 Sep 2023 09:26:43 +0200 Message-ID: <20230925073315.11627-8-tzimmermann@suse.de> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230925073315.11627-1-tzimmermann@suse.de> References: <20230925073315.11627-1-tzimmermann@suse.de> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 7/7] drm/i915: Implement fbdev emulation as in-kernel client X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: intel-gfx@lists.freedesktop.org, Thomas Zimmermann , dri-devel@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Replace all code that initializes or releases fbdev emulation throughout the driver. Instead initialize the fbdev client by a single call to i915_fbdev_setup() after i915 has registered its DRM device. Just like similar code in other drivers, i915 fbdev emulation now acts as a regular DRM client. The fbdev client setup consists of the initial preparation and the hot-plugging of the display. The latter creates the fbdev device and sets up the fbdev framebuffer. The setup performs display hot-plugging once. If no display can be detected, DRM probe helpers re-run the detection on each hotplug event. A call to drm_dev_unregister() releases the client automatically. No further action is required within i915. If the fbdev framebuffer has been fully set up, struct fb_ops.fb_destroy implements the release. For partially initialized emulation, the fbdev client reverts the initial setup. v3: * as before, silently ignore devices without displays v2: * let drm_client_register() handle initial hotplug * fix driver name in error message (Jani) * fix non-fbdev build (kernel test robot) Signed-off-by: Thomas Zimmermann --- drivers/gpu/drm/i915/display/intel_display.c | 1 - .../drm/i915/display/intel_display_driver.c | 18 -- drivers/gpu/drm/i915/display/intel_fbdev.c | 184 ++++++++---------- drivers/gpu/drm/i915/display/intel_fbdev.h | 20 +- drivers/gpu/drm/i915/i915_driver.c | 2 + 5 files changed, 85 insertions(+), 140 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c index edbcf5968804d..7efa8d2787c39 100644 --- a/drivers/gpu/drm/i915/display/intel_display.c +++ b/drivers/gpu/drm/i915/display/intel_display.c @@ -81,7 +81,6 @@ #include "intel_dvo.h" #include "intel_fb.h" #include "intel_fbc.h" -#include "intel_fbdev.h" #include "intel_fdi.h" #include "intel_fifo_underrun.h" #include "intel_frontbuffer.h" diff --git a/drivers/gpu/drm/i915/display/intel_display_driver.c b/drivers/gpu/drm/i915/display/intel_display_driver.c index ffdcddd1943e0..213a4ee93ffc2 100644 --- a/drivers/gpu/drm/i915/display/intel_display_driver.c +++ b/drivers/gpu/drm/i915/display/intel_display_driver.c @@ -364,10 +364,6 @@ int intel_display_driver_probe(struct drm_i915_private *i915) intel_overlay_setup(i915); - ret = intel_fbdev_init(&i915->drm); - if (ret) - return ret; - /* Only enable hotplug handling once the fbdev is fully set up. */ intel_hpd_init(i915); intel_hpd_poll_disable(i915); @@ -392,16 +388,6 @@ void intel_display_driver_register(struct drm_i915_private *i915) intel_display_debugfs_register(i915); - /* - * Some ports require correctly set-up hpd registers for - * detection to work properly (leading to ghost connected - * connector status), e.g. VGA on gm45. Hence we can only set - * up the initial fbdev config after hpd irqs are fully - * enabled. We do it last so that the async config cannot run - * before the connectors are registered. - */ - intel_fbdev_initial_config_async(i915); - /* * We need to coordinate the hotplugs with the asynchronous * fbdev configuration, for which we use the @@ -445,9 +431,6 @@ void intel_display_driver_remove_noirq(struct drm_i915_private *i915) */ intel_hpd_poll_fini(i915); - /* poll work can call into fbdev, hence clean that up afterwards */ - intel_fbdev_fini(i915); - intel_unregister_dsm_handler(); /* flush any delayed tasks or pending work */ @@ -484,7 +467,6 @@ void intel_display_driver_unregister(struct drm_i915_private *i915) if (!HAS_DISPLAY(i915)) return; - intel_fbdev_unregister(i915); intel_audio_deinit(i915); /* diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c index 31e8275a70fea..100a4aaf1b7e4 100644 --- a/drivers/gpu/drm/i915/display/intel_fbdev.c +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c @@ -24,7 +24,6 @@ * David Airlie */ -#include #include #include #include @@ -39,6 +38,7 @@ #include #include +#include #include #include #include @@ -58,7 +58,6 @@ struct intel_fbdev { struct intel_framebuffer *fb; struct i915_vma *vma; unsigned long vma_flags; - async_cookie_t cookie; int preferred_bpp; /* Whether or not fbdev hpd processing is temporarily suspended */ @@ -135,6 +134,26 @@ static int intel_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma) return i915_gem_fb_mmap(obj, vma); } +static void intel_fbdev_fb_destroy(struct fb_info *info) +{ + struct drm_fb_helper *fb_helper = info->par; + struct intel_fbdev *ifbdev = container_of(fb_helper, struct intel_fbdev, helper); + + drm_fb_helper_fini(&ifbdev->helper); + + /* + * We rely on the object-free to release the VMA pinning for + * the info->screen_base mmaping. Leaking the VMA is simpler than + * trying to rectify all the possible error paths leading here. + */ + intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags); + drm_framebuffer_remove(&ifbdev->fb->base); + + drm_client_release(&fb_helper->client); + drm_fb_helper_unprepare(&ifbdev->helper); + kfree(ifbdev); +} + static const struct fb_ops intelfb_ops = { .owner = THIS_MODULE, __FB_DEFAULT_DEFERRED_OPS_RDWR(intel_fbdev), @@ -144,6 +163,7 @@ static const struct fb_ops intelfb_ops = { .fb_pan_display = intel_fbdev_pan_display, __FB_DEFAULT_DEFERRED_OPS_DRAW(intel_fbdev), .fb_mmap = intel_fbdev_mmap, + .fb_destroy = intel_fbdev_fb_destroy, }; static int intelfb_alloc(struct drm_fb_helper *helper, @@ -212,7 +232,6 @@ static int intelfb_create(struct drm_fb_helper *helper, struct intel_framebuffer *intel_fb = ifbdev->fb; struct drm_device *dev = helper->dev; struct drm_i915_private *dev_priv = to_i915(dev); - struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev); struct i915_ggtt *ggtt = to_gt(dev_priv)->ggtt; const struct i915_gtt_view view = { .type = I915_GTT_VIEW_NORMAL, @@ -337,7 +356,7 @@ static int intelfb_create(struct drm_fb_helper *helper, ifbdev->vma_flags = flags; intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref); - vga_switcheroo_client_fb_set(pdev, info); + return 0; out_unpin: @@ -363,26 +382,6 @@ static const struct drm_fb_helper_funcs intel_fb_helper_funcs = { .fb_dirty = intelfb_dirty, }; -static void intel_fbdev_destroy(struct intel_fbdev *ifbdev) -{ - /* We rely on the object-free to release the VMA pinning for - * the info->screen_base mmaping. Leaking the VMA is simpler than - * trying to rectify all the possible error paths leading here. - */ - - drm_fb_helper_fini(&ifbdev->helper); - - if (ifbdev->vma) - intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags); - - if (ifbdev->fb) - drm_framebuffer_remove(&ifbdev->fb->base); - - drm_client_release(&ifbdev->helper.client); - drm_fb_helper_unprepare(&ifbdev->helper); - kfree(ifbdev); -} - /* * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible. * The core display code will have read out the current plane configuration, @@ -546,16 +545,6 @@ static void intel_fbdev_suspend_worker(struct work_struct *work) true); } -static void intel_fbdev_sync(struct intel_fbdev *ifbdev) -{ - if (!ifbdev->cookie) - return; - - /* Only serialises with all preceding async calls, hence +1 */ - async_synchronize_cookie(ifbdev->cookie + 1); - ifbdev->cookie = 0; -} - /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD * processing, fbdev will perform a full connector reprobe if a hotplug event * was received while HPD was suspended. @@ -646,8 +635,6 @@ static void intel_fbdev_output_poll_changed(struct drm_device *dev) if (!ifbdev) return; - intel_fbdev_sync(ifbdev); - mutex_lock(&ifbdev->hpd_lock); send_hpd = !ifbdev->hpd_suspended; ifbdev->hpd_waiting = true; @@ -664,7 +651,6 @@ static void intel_fbdev_restore_mode(struct drm_i915_private *dev_priv) if (!ifbdev) return; - intel_fbdev_sync(ifbdev); if (!ifbdev->vma) return; @@ -677,7 +663,20 @@ static void intel_fbdev_restore_mode(struct drm_i915_private *dev_priv) */ static void intel_fbdev_client_unregister(struct drm_client_dev *client) -{ } +{ + struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); + struct drm_device *dev = fb_helper->dev; + struct pci_dev *pdev = to_pci_dev(dev->dev); + + if (fb_helper->info) { + vga_switcheroo_client_fb_set(pdev, NULL); + drm_fb_helper_unregister_info(fb_helper); + } else { + drm_fb_helper_unprepare(fb_helper); + drm_client_release(&fb_helper->client); + kfree(fb_helper); + } +} static int intel_fbdev_client_restore(struct drm_client_dev *client) { @@ -691,9 +690,36 @@ static int intel_fbdev_client_restore(struct drm_client_dev *client) static int intel_fbdev_client_hotplug(struct drm_client_dev *client) { - intel_fbdev_output_poll_changed(client->dev); + struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); + struct drm_device *dev = client->dev; + struct pci_dev *pdev = to_pci_dev(dev->dev); + int ret; + + if (dev->fb_helper) { + intel_fbdev_output_poll_changed(dev); + return 0; + } + + ret = drm_fb_helper_init(dev, fb_helper); + if (ret) + goto err_drm_err; + + if (!drm_drv_uses_atomic_modeset(dev)) + drm_helper_disable_unused_functions(dev); + + ret = drm_fb_helper_initial_config(fb_helper); + if (ret) + goto err_drm_fb_helper_fini; + + vga_switcheroo_client_fb_set(pdev, fb_helper->info); return 0; + +err_drm_fb_helper_fini: + drm_fb_helper_fini(fb_helper); +err_drm_err: + drm_err(dev, "Failed to setup i915 fbdev emulation (ret=%d)\n", ret); + return ret; } static const struct drm_client_funcs intel_fbdev_client_funcs = { @@ -703,22 +729,23 @@ static const struct drm_client_funcs intel_fbdev_client_funcs = { .hotplug = intel_fbdev_client_hotplug, }; -int intel_fbdev_init(struct drm_device *dev) +void intel_fbdev_setup(struct drm_i915_private *dev_priv) { - struct drm_i915_private *dev_priv = to_i915(dev); + struct drm_device *dev = &dev_priv->drm; struct intel_fbdev *ifbdev; int ret; - if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv))) - return -ENODEV; - - ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL); - if (ifbdev == NULL) - return -ENOMEM; + if (!HAS_DISPLAY(dev_priv)) + return; - mutex_init(&ifbdev->hpd_lock); + ifbdev = kzalloc(sizeof(*ifbdev), GFP_KERNEL); + if (!ifbdev) + return; drm_fb_helper_prepare(dev, &ifbdev->helper, 32, &intel_fb_helper_funcs); + dev_priv->display.fbdev.fbdev = ifbdev; + INIT_WORK(&dev_priv->display.fbdev.suspend_work, intel_fbdev_suspend_worker); + mutex_init(&ifbdev->hpd_lock); if (intel_fbdev_init_bios(dev, ifbdev)) ifbdev->helper.preferred_bpp = ifbdev->preferred_bpp; else @@ -726,68 +753,19 @@ int intel_fbdev_init(struct drm_device *dev) ret = drm_client_init(dev, &ifbdev->helper.client, "i915-fbdev", &intel_fbdev_client_funcs); - if (ret) + if (ret) { + drm_err(dev, "Failed to register client: %d\n", ret); goto err_drm_fb_helper_unprepare; + } - ret = drm_fb_helper_init(dev, &ifbdev->helper); - if (ret) - goto err_drm_client_release; - - dev_priv->display.fbdev.fbdev = ifbdev; - INIT_WORK(&dev_priv->display.fbdev.suspend_work, intel_fbdev_suspend_worker); + drm_client_register(&ifbdev->helper.client); - return 0; + return; -err_drm_client_release: - drm_client_release(&ifbdev->helper.client); err_drm_fb_helper_unprepare: drm_fb_helper_unprepare(&ifbdev->helper); + mutex_destroy(&ifbdev->hpd_lock); kfree(ifbdev); - return ret; -} - -static void intel_fbdev_initial_config(void *data, async_cookie_t cookie) -{ - struct intel_fbdev *ifbdev = data; - - /* Due to peculiar init order wrt to hpd handling this is separate. */ - if (drm_fb_helper_initial_config(&ifbdev->helper)) - intel_fbdev_unregister(to_i915(ifbdev->helper.dev)); -} - -void intel_fbdev_initial_config_async(struct drm_i915_private *dev_priv) -{ - struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev; - - if (!ifbdev) - return; - - ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev); -} - -void intel_fbdev_unregister(struct drm_i915_private *dev_priv) -{ - struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev; - - if (!ifbdev) - return; - - intel_fbdev_set_suspend(&dev_priv->drm, FBINFO_STATE_SUSPENDED, true); - - if (!current_is_async()) - intel_fbdev_sync(ifbdev); - - drm_fb_helper_unregister_info(&ifbdev->helper); -} - -void intel_fbdev_fini(struct drm_i915_private *dev_priv) -{ - struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->display.fbdev.fbdev); - - if (!ifbdev) - return; - - intel_fbdev_destroy(ifbdev); } struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev) diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.h b/drivers/gpu/drm/i915/display/intel_fbdev.h index 8c953f102ba22..08de2d5b34338 100644 --- a/drivers/gpu/drm/i915/display/intel_fbdev.h +++ b/drivers/gpu/drm/i915/display/intel_fbdev.h @@ -14,27 +14,11 @@ struct intel_fbdev; struct intel_framebuffer; #ifdef CONFIG_DRM_FBDEV_EMULATION -int intel_fbdev_init(struct drm_device *dev); -void intel_fbdev_initial_config_async(struct drm_i915_private *dev_priv); -void intel_fbdev_unregister(struct drm_i915_private *dev_priv); -void intel_fbdev_fini(struct drm_i915_private *dev_priv); +void intel_fbdev_setup(struct drm_i915_private *dev_priv); void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous); struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev); #else -static inline int intel_fbdev_init(struct drm_device *dev) -{ - return 0; -} - -static inline void intel_fbdev_initial_config_async(struct drm_i915_private *dev_priv) -{ -} - -static inline void intel_fbdev_unregister(struct drm_i915_private *dev_priv) -{ -} - -static inline void intel_fbdev_fini(struct drm_i915_private *dev_priv) +static inline void intel_fbdev_setup(struct drm_i915_private *dev_priv) { } diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c index 86460cd8167d1..53663c0cc3be4 100644 --- a/drivers/gpu/drm/i915/i915_driver.c +++ b/drivers/gpu/drm/i915/i915_driver.c @@ -817,6 +817,8 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent) i915->do_release = true; + intel_fbdev_setup(i915); + return 0; out_cleanup_gem: