From patchwork Mon Jan 24 12:36:55 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 12722036 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 60EA0C433FE for ; Mon, 24 Jan 2022 12:37:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238400AbiAXMhH (ORCPT ); Mon, 24 Jan 2022 07:37:07 -0500 Received: from smtp-out1.suse.de ([195.135.220.28]:47912 "EHLO smtp-out1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239545AbiAXMhH (ORCPT ); Mon, 24 Jan 2022 07:37:07 -0500 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-out1.suse.de (Postfix) with ESMTPS id EF6F221991; Mon, 24 Jan 2022 12:37:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1643027825; 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=sbKMhoGEFM5DRua4TCfIt+KaHZ7VwHUYL4HswVi+bMo=; b=OwR5ARjOuSDRN5wcsmRIcUffZwCKiNjx7N82ZbfaN/xJfI+ILCTvkrL1cOURwPwcWBASel J4xBTLrm4MZkuqZHzKWFY3jsZ/Hl9IcGvQwUeOnD/AijUDW4kWNlPr05oiqDeciOcDPJwv YGgcwIl60ZJJiKgP55RFRhbCqGCQJBE= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1643027825; 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=sbKMhoGEFM5DRua4TCfIt+KaHZ7VwHUYL4HswVi+bMo=; b=BEcNSygkDqfP43s/dwnR8tP2DKv/C6Jmn64aTJwryrOESc+2LPuKMwe8Oqr+pi5HdQyiTX mAqZrjIkJn8IdfDA== 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 AE28513BA4; Mon, 24 Jan 2022 12:37:05 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id iB6UKXGd7mFyNQAAMHmgww (envelope-from ); Mon, 24 Jan 2022 12:37:05 +0000 From: Thomas Zimmermann To: zackr@vmware.com, javierm@redhat.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, airlied@linux.ie, daniel@ffwll.ch, deller@gmx.de, hdegoede@redhat.com Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, Thomas Zimmermann , stable@vger.kernel.org Subject: [PATCH 1/5] fbdev: Hot-unplug firmware fb devices on forced removal Date: Mon, 24 Jan 2022 13:36:55 +0100 Message-Id: <20220124123659.4692-2-tzimmermann@suse.de> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220124123659.4692-1-tzimmermann@suse.de> References: <20220124123659.4692-1-tzimmermann@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org Hot-unplug all firmware-framebuffer devices as part of removing them via remove_conflicting_framebuffers() et al. Releases all memory regions to be acquired by native drivers. Firmware, such as EFI, install a framebuffer while posting the computer. After removing the firmware-framebuffer device from fbdev, a native driver takes over the hardware and the firmware framebuffer becomes invalid. Firmware-framebuffer drivers, specifically simplefb, don't release their device from Linux' device hierarchy. It still owns the firmware framebuffer and blocks the native drivers from loading. This has been observed in the vmwgfx driver. [1] Initiating a device removal (i.e., hot unplug) as part of remove_conflicting_framebuffers() removes the underlying device and returns the memory range to the system. [1] https://lore.kernel.org/dri-devel/20220117180359.18114-1-zack@kde.org/ Signed-off-by: Thomas Zimmermann CC: stable@vger.kernel.org # v5.11+ Reviewed-by: Javier Martinez Canillas Reviewed-by: Zack Rusin --- drivers/video/fbdev/core/fbmem.c | 29 ++++++++++++++++++++++++++--- include/linux/fb.h | 1 + 2 files changed, 27 insertions(+), 3 deletions(-) diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c index 0fa7ede94fa6..f73f8415b8cb 100644 --- a/drivers/video/fbdev/core/fbmem.c +++ b/drivers/video/fbdev/core/fbmem.c @@ -25,6 +25,7 @@ #include #include #include +#include #include #include #include @@ -1557,18 +1558,36 @@ static void do_remove_conflicting_framebuffers(struct apertures_struct *a, /* check all firmware fbs and kick off if the base addr overlaps */ for_each_registered_fb(i) { struct apertures_struct *gen_aper; + struct device *dev; if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE)) continue; gen_aper = registered_fb[i]->apertures; + dev = registered_fb[i]->device; if (fb_do_apertures_overlap(gen_aper, a) || (primary && gen_aper && gen_aper->count && gen_aper->ranges[0].base == VGA_FB_PHYS)) { printk(KERN_INFO "fb%d: switching to %s from %s\n", i, name, registered_fb[i]->fix.id); - do_unregister_framebuffer(registered_fb[i]); + + /* + * If we kick-out a firmware driver, we also want to remove + * the underlying platform device, such as simple-framebuffer, + * VESA, EFI, etc. A native driver will then be able to + * allocate the memory range. + * + * If it's not a platform device, at least print a warning. A + * fix would add code to remove the device from the system. + */ + if (dev_is_platform(dev)) { + registered_fb[i]->forced_out = true; + platform_device_unregister(to_platform_device(dev)); + } else { + pr_warn("fb%d: cannot remove device\n", i); + do_unregister_framebuffer(registered_fb[i]); + } } } } @@ -1898,9 +1917,13 @@ EXPORT_SYMBOL(register_framebuffer); void unregister_framebuffer(struct fb_info *fb_info) { - mutex_lock(®istration_lock); + bool forced_out = fb_info->forced_out; + + if (!forced_out) + mutex_lock(®istration_lock); do_unregister_framebuffer(fb_info); - mutex_unlock(®istration_lock); + if (!forced_out) + mutex_unlock(®istration_lock); } EXPORT_SYMBOL(unregister_framebuffer); diff --git a/include/linux/fb.h b/include/linux/fb.h index 3da95842b207..9a14f3f8a329 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -502,6 +502,7 @@ struct fb_info { } *apertures; bool skip_vt_switch; /* no VT switch on suspend/resume required */ + bool forced_out; /* set when being removed by another driver */ }; static inline struct apertures_struct *alloc_apertures(unsigned int max_num) { From patchwork Mon Jan 24 12:36:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 12722034 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 195B6C433F5 for ; Mon, 24 Jan 2022 12:37:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241645AbiAXMhH (ORCPT ); Mon, 24 Jan 2022 07:37:07 -0500 Received: from smtp-out2.suse.de ([195.135.220.29]:39062 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239723AbiAXMhH (ORCPT ); Mon, 24 Jan 2022 07:37:07 -0500 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 44D461F38B; Mon, 24 Jan 2022 12:37:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1643027826; 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=L/fJ6I46TmC5ehgzZqqDJcNLTjN9385V+P8YAjicLPE=; b=BOpvpZlVwooexh2HCI/iZ1pswkZOilqmS9qoZhL4g59hByb3l0HM6l9cQgXlWyVhqKMkaB m9oIX05JIvcLP67a0Gl6o66OWTb25zEZC0uGRoyl9hicSMGhh+4ZVhK33zeR3XGEDmV6ll 9OJr6ftygI7KQrJ5/0PuQ4lKWrjPhsw= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1643027826; 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=L/fJ6I46TmC5ehgzZqqDJcNLTjN9385V+P8YAjicLPE=; b=lrT0s6Vm80rFTRs9W61LDbBTYqNziRqWHZgE95fzYRrny9Na8cfwASDxYfE3eDCRsYyppw 0l88DNrqnMVT1KDg== 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 F2B0B13B97; Mon, 24 Jan 2022 12:37:05 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id QIhIOnGd7mFyNQAAMHmgww (envelope-from ); Mon, 24 Jan 2022 12:37:05 +0000 From: Thomas Zimmermann To: zackr@vmware.com, javierm@redhat.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, airlied@linux.ie, daniel@ffwll.ch, deller@gmx.de, hdegoede@redhat.com Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org Subject: [PATCH 2/5] drivers/firmware: Don't mark as busy the simple-framebuffer IO resource Date: Mon, 24 Jan 2022 13:36:56 +0100 Message-Id: <20220124123659.4692-3-tzimmermann@suse.de> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220124123659.4692-1-tzimmermann@suse.de> References: <20220124123659.4692-1-tzimmermann@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org From: Javier Martinez Canillas The sysfb_create_simplefb() function requests a IO memory resource for the simple-framebuffer platform device, but it also marks it as busy which can lead to drivers requesting the same memory resource to fail. Let's drop the IORESOURCE_BUSY flag and let drivers to request it as busy instead. Signed-off-by: Javier Martinez Canillas Reviewed-by: Zack Rusin --- drivers/firmware/sysfb_simplefb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/firmware/sysfb_simplefb.c b/drivers/firmware/sysfb_simplefb.c index 303a491e520d..76c4abc42a30 100644 --- a/drivers/firmware/sysfb_simplefb.c +++ b/drivers/firmware/sysfb_simplefb.c @@ -99,7 +99,7 @@ __init int sysfb_create_simplefb(const struct screen_info *si, /* setup IORESOURCE_MEM as framebuffer memory */ memset(&res, 0, sizeof(res)); - res.flags = IORESOURCE_MEM | IORESOURCE_BUSY; + res.flags = IORESOURCE_MEM; res.name = simplefb_resname; res.start = base; res.end = res.start + length - 1; From patchwork Mon Jan 24 12:36:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 12722035 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9670BC43219 for ; Mon, 24 Jan 2022 12:37:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239545AbiAXMhI (ORCPT ); Mon, 24 Jan 2022 07:37:08 -0500 Received: from smtp-out2.suse.de ([195.135.220.29]:39088 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241215AbiAXMhH (ORCPT ); Mon, 24 Jan 2022 07:37:07 -0500 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 7BBA41F38F; Mon, 24 Jan 2022 12:37:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1643027826; 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=9lYRh2nW2gDT1C90x0lvcg1tfcOcymqymgktmR6tiFg=; b=PyNrqIXvW847xsRZbPSLS1pAcF43YjRceDx5UEiM8KUNmC8rPEAUMlBr/hvPlVPm9i7Mm6 w35A+rCVQ1eQd2WtOQ1zxzd2Zvnabrdcbi8rFKQm9Rnp6VLn794h6b3Az+yAZhNPw44ita GT8Rpfq+dtqkCxlsn7VMYR/3OVjCQ0A= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1643027826; 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=9lYRh2nW2gDT1C90x0lvcg1tfcOcymqymgktmR6tiFg=; b=EV/jIaMY9C7cx2vwPRW6+BkByfjFXV8P3RNMme9xpJJpvWICwy9LUcrdk0KNCY5kioi6bN 1hAC28RW7MoPU7DQ== 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 3E0CF13BA4; Mon, 24 Jan 2022 12:37:06 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id CGQmDnKd7mFyNQAAMHmgww (envelope-from ); Mon, 24 Jan 2022 12:37:06 +0000 From: Thomas Zimmermann To: zackr@vmware.com, javierm@redhat.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, airlied@linux.ie, daniel@ffwll.ch, deller@gmx.de, hdegoede@redhat.com Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, Thomas Zimmermann Subject: [PATCH 3/5] drm/simpledrm: Request memory region in driver Date: Mon, 24 Jan 2022 13:36:57 +0100 Message-Id: <20220124123659.4692-4-tzimmermann@suse.de> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220124123659.4692-1-tzimmermann@suse.de> References: <20220124123659.4692-1-tzimmermann@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org Requesting the framebuffer memory in simpledrm marks the memory range as busy. This used to be done by the firmware sysfb code, but the driver is the correct place. Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas --- drivers/gpu/drm/tiny/simpledrm.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c index 04146da2d1d8..f72b71511a65 100644 --- a/drivers/gpu/drm/tiny/simpledrm.c +++ b/drivers/gpu/drm/tiny/simpledrm.c @@ -526,21 +526,31 @@ static int simpledrm_device_init_mm(struct simpledrm_device *sdev) { struct drm_device *dev = &sdev->dev; struct platform_device *pdev = sdev->pdev; - struct resource *mem; + struct resource *res, *mem; void __iomem *screen_base; int ret; - mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!mem) + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) return -EINVAL; - ret = devm_aperture_acquire_from_firmware(dev, mem->start, resource_size(mem)); + ret = devm_aperture_acquire_from_firmware(dev, res->start, resource_size(res)); if (ret) { drm_err(dev, "could not acquire memory range %pr: error %d\n", - mem, ret); + res, ret); return ret; } + mem = devm_request_mem_region(&pdev->dev, res->start, resource_size(res), + sdev->dev.driver->name); + if (!mem) { + /* + * We cannot make this fatal. Sometimes this comes from magic + * spaces our resource handlers simply don't know about + */ + drm_warn(dev, "could not acquire memory region %pr\n", res); + } + screen_base = devm_ioremap_wc(&pdev->dev, mem->start, resource_size(mem)); if (!screen_base) From patchwork Mon Jan 24 12:36:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 12722037 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2E92C43217 for ; Mon, 24 Jan 2022 12:37:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239723AbiAXMhI (ORCPT ); Mon, 24 Jan 2022 07:37:08 -0500 Received: from smtp-out2.suse.de ([195.135.220.29]:39118 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241520AbiAXMhH (ORCPT ); Mon, 24 Jan 2022 07:37:07 -0500 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 B76831F3A5; Mon, 24 Jan 2022 12:37:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1643027826; 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=6BvTyfbynmp1tvbb2xrVXgUH7BvMPhSq6ndaTxmcMSQ=; b=LNx1IfQ25ERpOinjT20TO53P419CkVkTJnbo7/0MSj3HcXziffuuTCFtSNHRQd1bYzavLp ceYYMbOArNS2SG1qR0/b7iOsVd7/XD0Cu7Nsr9jWxshp814XrdU8FPC0QySyV5reldlgpi 7QHas/aCIoJ7/5oxboAV+Eq1TOBQ6AU= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1643027826; 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=6BvTyfbynmp1tvbb2xrVXgUH7BvMPhSq6ndaTxmcMSQ=; b=BEsVzO0YHkscZc04nypFBPS7hSNV0xz8Z3AcKDhPibw7OWJK7zctmVxGiyl6p7D1D+A/u/ oK5lnEQYrhJAaCDA== 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 7DC0B13B97; Mon, 24 Jan 2022 12:37:06 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id sKbgHXKd7mFyNQAAMHmgww (envelope-from ); Mon, 24 Jan 2022 12:37:06 +0000 From: Thomas Zimmermann To: zackr@vmware.com, javierm@redhat.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, airlied@linux.ie, daniel@ffwll.ch, deller@gmx.de, hdegoede@redhat.com Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, Thomas Zimmermann Subject: [PATCH 4/5] fbdev/simplefb: Request memory region in driver Date: Mon, 24 Jan 2022 13:36:58 +0100 Message-Id: <20220124123659.4692-5-tzimmermann@suse.de> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220124123659.4692-1-tzimmermann@suse.de> References: <20220124123659.4692-1-tzimmermann@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org Requesting the framebuffer memory in simpledrm marks the memory range as busy. This used to be done by the firmware sysfb code, but the driver is the correct place. Signed-off-by: Thomas Zimmermann --- drivers/video/fbdev/simplefb.c | 59 ++++++++++++++++++++++++---------- 1 file changed, 42 insertions(+), 17 deletions(-) diff --git a/drivers/video/fbdev/simplefb.c b/drivers/video/fbdev/simplefb.c index 57541887188b..84452028ecc9 100644 --- a/drivers/video/fbdev/simplefb.c +++ b/drivers/video/fbdev/simplefb.c @@ -66,16 +66,36 @@ static int simplefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, return 0; } -struct simplefb_par; +struct simplefb_par { + u32 palette[PSEUDO_PALETTE_SIZE]; +#if defined CONFIG_OF && defined CONFIG_COMMON_CLK + bool clks_enabled; + unsigned int clk_count; + struct clk **clks; +#endif +#if defined CONFIG_OF && defined CONFIG_REGULATOR + bool regulators_enabled; + u32 regulator_count; + struct regulator **regulators; +#endif + bool release_mem_region; +}; + static void simplefb_clocks_destroy(struct simplefb_par *par); static void simplefb_regulators_destroy(struct simplefb_par *par); static void simplefb_destroy(struct fb_info *info) { + struct simplefb_par *par = info->par; + simplefb_regulators_destroy(info->par); simplefb_clocks_destroy(info->par); if (info->screen_base) iounmap(info->screen_base); + + if (par->release_mem_region) + release_mem_region(info->apertures->ranges[0].base, + info->apertures->ranges[0].size); } static const struct fb_ops simplefb_ops = { @@ -169,20 +189,6 @@ static int simplefb_parse_pd(struct platform_device *pdev, return 0; } -struct simplefb_par { - u32 palette[PSEUDO_PALETTE_SIZE]; -#if defined CONFIG_OF && defined CONFIG_COMMON_CLK - bool clks_enabled; - unsigned int clk_count; - struct clk **clks; -#endif -#if defined CONFIG_OF && defined CONFIG_REGULATOR - bool regulators_enabled; - u32 regulator_count; - struct regulator **regulators; -#endif -}; - #if defined CONFIG_OF && defined CONFIG_COMMON_CLK /* * Clock handling code. @@ -401,6 +407,7 @@ static void simplefb_regulators_destroy(struct simplefb_par *par) { } static int simplefb_probe(struct platform_device *pdev) { + bool request_mem_succeeded = false; int ret; struct simplefb_params params; struct fb_info *info; @@ -436,9 +443,22 @@ static int simplefb_probe(struct platform_device *pdev) return -EINVAL; } + if (request_mem_region(mem->start, resource_size(mem), "simplefb")) { + request_mem_succeeded = true; + } else { + /* + * We cannot make this fatal. Sometimes this comes from magic + * spaces our resource handlers simply don't know about + */ + dev_warn(&pdev->dev, "simplefb: cannot reserve video memory at %pR\n", + mem); + } + info = framebuffer_alloc(sizeof(struct simplefb_par), &pdev->dev); - if (!info) - return -ENOMEM; + if (!info) { + ret = -ENOMEM; + goto error_release_mem_region; + } platform_set_drvdata(pdev, info); par = info->par; @@ -495,6 +515,8 @@ static int simplefb_probe(struct platform_device *pdev) info->var.xres, info->var.yres, info->var.bits_per_pixel, info->fix.line_length); + par->release_mem_region = request_mem_succeeded; + ret = register_framebuffer(info); if (ret < 0) { dev_err(&pdev->dev, "Unable to register simplefb: %d\n", ret); @@ -513,6 +535,9 @@ static int simplefb_probe(struct platform_device *pdev) iounmap(info->screen_base); error_fb_release: framebuffer_release(info); +error_release_mem_region: + if (request_mem_succeeded) + release_mem_region(mem->start, resource_size(mem)); return ret; } From patchwork Mon Jan 24 12:36:59 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 12722038 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5F64BC4321E for ; Mon, 24 Jan 2022 12:37:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241215AbiAXMhI (ORCPT ); Mon, 24 Jan 2022 07:37:08 -0500 Received: from smtp-out1.suse.de ([195.135.220.28]:47946 "EHLO smtp-out1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241571AbiAXMhH (ORCPT ); Mon, 24 Jan 2022 07:37:07 -0500 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-out1.suse.de (Postfix) with ESMTPS id F360B21993; Mon, 24 Jan 2022 12:37:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1643027827; 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=EFsZAidzPnckRwG2ZrgeFcutvgWK0xqyN6mRgt0+1cY=; b=wIMYvn9QgvclsDVeWuprpzJM6RLs1EPYcfmJhGo2UmBlY9daF/pFllqaQU6AmxGjbSM6de 3IYIM8wJMYUg/1dTc6JBKJwpP/0TWLjykEUzXMdBPQe02bVVyjKdZpePx+hq2mLxUgmohL C0Y+6NWycWp5jcEO7uHsZNwx6FPGggY= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1643027827; 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=EFsZAidzPnckRwG2ZrgeFcutvgWK0xqyN6mRgt0+1cY=; b=UAoLjPluNwuGfsmB9NimS8RSuU7zHxEg67/fA/Gn6qRlmH+9igPAjHoD4j92dNN6U/OPNu 5ljBaAItlUIWR4AA== 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 B9F7A13BA4; Mon, 24 Jan 2022 12:37:06 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id 4GN7LHKd7mFyNQAAMHmgww (envelope-from ); Mon, 24 Jan 2022 12:37:06 +0000 From: Thomas Zimmermann To: zackr@vmware.com, javierm@redhat.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, airlied@linux.ie, daniel@ffwll.ch, deller@gmx.de, hdegoede@redhat.com Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, Thomas Zimmermann Subject: [PATCH 5/5] drm: Add TODO item for requesting memory regions Date: Mon, 24 Jan 2022 13:36:59 +0100 Message-Id: <20220124123659.4692-6-tzimmermann@suse.de> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220124123659.4692-1-tzimmermann@suse.de> References: <20220124123659.4692-1-tzimmermann@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org Add a TODO item about requesting memory regions for each driver. The current DRM drivers don't do this consistently. Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas --- Documentation/gpu/todo.rst | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst index da138dd39883..1b2372ef4131 100644 --- a/Documentation/gpu/todo.rst +++ b/Documentation/gpu/todo.rst @@ -467,6 +467,21 @@ Contact: Thomas Zimmermann Level: Intermediate +Request memory regions in all drivers +------------------------------------- + +Go through all drivers and add code to request the memory regions that the +driver uses. This requires adding calls to request_mem_region(), +pci_request_region() or similar functions. Use helpers for managed cleanup +where possible. + +Drivers are pretty bad at doing this and there used to be conflicts among +DRM and fbdev drivers. Still, it's the correct thing to do. + +Contact: Thomas Zimmermann + +Level: Starter + Core refactorings =================