From patchwork Tue Jul 11 16:43:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sui Jingfeng X-Patchwork-Id: 13309096 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 3365FEB64DC for ; Tue, 11 Jul 2023 16:48:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232180AbjGKQs4 (ORCPT ); Tue, 11 Jul 2023 12:48:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47966 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231755AbjGKQsm (ORCPT ); Tue, 11 Jul 2023 12:48:42 -0400 X-Greylist: delayed 306 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Tue, 11 Jul 2023 09:48:32 PDT Received: from out-39.mta1.migadu.com (out-39.mta1.migadu.com [95.215.58.39]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2362F170C for ; Tue, 11 Jul 2023 09:48:31 -0700 (PDT) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1689093806; 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=s3RR0NYHlYchGZfrgsz7DmY+bKmfwkFHz2pu3a35dQQ=; b=I5qtNN0Jv0yHnIw8B0ZM96XkL6ofHnJuNvasaGbT3c0CVhy4JVql7lhBIKJ0a88pTkuhtr GI3YR/MbqyrF8nt9Trbqmz9FfuxH7ds+Ggs9yRPeUKr3JLALf2q+ykJMIcSd81gBIbYW8I qdfJeJA7PWO6a4kHkGs3M6fPaFjedmA= From: Sui Jingfeng To: David Airlie Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, kvm@vger.kernel.org, linux-fbdev@vger.kernel.org, Sui Jingfeng , Thomas Zimmermann , Javier Martinez Canillas , Bjorn Helgaas , Helge Deller Subject: [PATCH v3 1/9] video/aperture: Add a helper to detect if an aperture contains firmware FB Date: Wed, 12 Jul 2023 00:43:02 +0800 Message-Id: <20230711164310.791756-2-sui.jingfeng@linux.dev> In-Reply-To: <20230711164310.791756-1-sui.jingfeng@linux.dev> References: <20230711164310.791756-1-sui.jingfeng@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Sui Jingfeng This patch adds the aperture_contain_firmware_fb() function to do the determination. Unfortunately, due to the fact that the apertures list will be freed dynamically, the location and size information of the firmware FB will be lost after dedicated drivers call aperture_remove_conflicting_devices(), aperture_remove_conflicting_pci_devices() or aperture_remove_all_conflicting_devices() functions      We solve this problem by introducing two static variables that record the firmware framebuffer's start addrness and end addrness. It assumes that the system has only one active firmware framebuffer driver at a time. We don't use the global structure screen_info here, because PCI resources may get reallocated (the VRAM BAR could be moved) during the kernel boot stage. Cc: Thomas Zimmermann Cc: Javier Martinez Canillas Cc: Bjorn Helgaas Cc: Helge Deller Signed-off-by: Sui Jingfeng --- drivers/gpu/drm/drm_aperture.c | 16 ++++++++++++++++ drivers/video/aperture.c | 29 +++++++++++++++++++++++++++++ include/drm/drm_aperture.h | 2 ++ include/linux/aperture.h | 7 +++++++ 4 files changed, 54 insertions(+) diff --git a/drivers/gpu/drm/drm_aperture.c b/drivers/gpu/drm/drm_aperture.c index 5729f3bb4398..f9c957aa5874 100644 --- a/drivers/gpu/drm/drm_aperture.c +++ b/drivers/gpu/drm/drm_aperture.c @@ -190,3 +190,19 @@ int drm_aperture_remove_conflicting_pci_framebuffers(struct pci_dev *pdev, return aperture_remove_conflicting_pci_devices(pdev, req_driver->name); } EXPORT_SYMBOL(drm_aperture_remove_conflicting_pci_framebuffers); + +/** + * drm_aperture_contain_firmware_fb - Determine if a aperture contains firmware framebuffer + * + * @base: the aperture's base address in physical memory + * @size: aperture size in bytes + * + * Returns: + * true if there exist a firmware framebuffer inside of the aperture passed in, + * or false otherwise. + */ +bool drm_aperture_contain_firmware_fb(resource_size_t base, resource_size_t size) +{ + return aperture_contain_firmware_fb(base, base + size); +} +EXPORT_SYMBOL(drm_aperture_contain_firmware_fb); diff --git a/drivers/video/aperture.c b/drivers/video/aperture.c index 561be8feca96..34eb962cfae8 100644 --- a/drivers/video/aperture.c +++ b/drivers/video/aperture.c @@ -141,6 +141,9 @@ struct aperture_range { static LIST_HEAD(apertures); static DEFINE_MUTEX(apertures_lock); +static resource_size_t firm_fb_start; +static resource_size_t firm_fb_end; + static bool overlap(resource_size_t base1, resource_size_t end1, resource_size_t base2, resource_size_t end2) { @@ -170,6 +173,9 @@ static int devm_aperture_acquire(struct device *dev, mutex_lock(&apertures_lock); + firm_fb_start = base; + firm_fb_end = end; + list_for_each(pos, &apertures) { ap = container_of(pos, struct aperture_range, lh); if (overlap(base, end, ap->base, ap->base + ap->size)) { @@ -377,3 +383,26 @@ int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *na } EXPORT_SYMBOL(aperture_remove_conflicting_pci_devices); + +/** + * aperture_contain_firmware_fb - Detect if the firmware framebuffer belong to + * a aperture. + * @ap_start: the aperture's start address in physical memory + * @ap_end: the aperture's end address in physical memory + * + * Returns: + * true if there is a firmware framebuffer belong to the aperture passed in, + * or false otherwise. + */ +bool aperture_contain_firmware_fb(resource_size_t ap_start, resource_size_t ap_end) +{ + /* No firmware framebuffer support */ + if (!firm_fb_start || !firm_fb_end) + return false; + + if (firm_fb_start >= ap_start && firm_fb_end <= ap_end) + return true; + + return false; +} +EXPORT_SYMBOL(aperture_contain_firmware_fb); diff --git a/include/drm/drm_aperture.h b/include/drm/drm_aperture.h index cbe33b49fd5d..6a0b9bacb081 100644 --- a/include/drm/drm_aperture.h +++ b/include/drm/drm_aperture.h @@ -35,4 +35,6 @@ drm_aperture_remove_framebuffers(const struct drm_driver *req_driver) req_driver); } +bool drm_aperture_contain_firmware_fb(resource_size_t base, resource_size_t size); + #endif diff --git a/include/linux/aperture.h b/include/linux/aperture.h index 1a9a88b11584..d4dc5917c49b 100644 --- a/include/linux/aperture.h +++ b/include/linux/aperture.h @@ -19,6 +19,8 @@ int aperture_remove_conflicting_devices(resource_size_t base, resource_size_t si int __aperture_remove_legacy_vga_devices(struct pci_dev *pdev); int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *name); + +bool aperture_contain_firmware_fb(resource_size_t ap_start, resource_size_t ap_end); #else static inline int devm_aperture_acquire_for_platform_device(struct platform_device *pdev, resource_size_t base, @@ -42,6 +44,11 @@ static inline int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, { return 0; } + +static inline bool aperture_contain_firmware_fb(resource_size_t ap_start, resource_size_t ap_end) +{ + return false; +} #endif /**