From patchwork Mon Jan 15 14:46:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Philipp Stanner X-Patchwork-Id: 13519721 X-Patchwork-Delegate: bhelgaas@google.com Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B4020179AF for ; Mon, 15 Jan 2024 14:47:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="C0HHSfn0" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1705330045; h=from:from:reply-to:subject:subject: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=RO0mZDJz5TK909+4LedW3qKsNhM3MJg2yInHziL/J8s=; b=C0HHSfn0qZzHu/IAqsZ53H2L3xXeNpzULGhL2STwLlECph0/nohD/e/tN1QnCM5gnl+tYC QWURZVZEpS5SR9UICD2C07LJjikEbecsEFxvuId1OmdoPMI97ofhXR8ROJQ0gu7uOUWyFe 9jJJL/ZYEWuzgBIKanbmNlPDHedB6Iw= Received: from mail-vk1-f199.google.com (mail-vk1-f199.google.com [209.85.221.199]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-646-R5R9hMoON1yhaoHrPa6NwA-1; Mon, 15 Jan 2024 09:47:24 -0500 X-MC-Unique: R5R9hMoON1yhaoHrPa6NwA-1 Received: by mail-vk1-f199.google.com with SMTP id 71dfb90a1353d-4b7612db75fso197443e0c.0 for ; Mon, 15 Jan 2024 06:47:23 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1705330043; x=1705934843; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=RO0mZDJz5TK909+4LedW3qKsNhM3MJg2yInHziL/J8s=; b=Ih7ss2a4Z+O2tcFNxEQSqqQL6LqK8/LUeecfJ1FvWL4US7kurwIDXzg+7MHg5I249W oOyVinPFWWD+OSeOSWcjIxLpRrcL7cVb3hZ97a+1UM12C76/AOZU0oS5hYy9QgBAy8Sg YUkxGqo+SMI8dUUa9o0mIR9fVPxuTdZXKWohBmVCzK5N2cSozEzPv7XC7bRShhjE4E1o qpsMXIX2FpHaQ+AwwVDt6MVbjRzIK0DcCRYwQzptbA5vDMYtHGTBiTL25YnHiXuQtZoS Ci0xxtqn93M0hRsZUmnWhAolkaGv9wG1xIfo9/51RCTE5eI+d5nFH0XxGqz6OhTto/Yt 5m/w== X-Gm-Message-State: AOJu0Yy1k5O5kEQ9tmbF1BTUc3TwxBe9Zcb6uSpJgMzFU0AKFpHBkgTh mwb0+p4yPdN5rQgdwZfqVxHDJB5iFBDUZMJt5zjtKADvifc3ldrlgr770a7H05ZkZ66d0adRCm6 LgT3bu/tlNoHryZgp6Q1T0pL6tjgf X-Received: by 2002:a05:6122:200a:b0:4b6:e3fa:7599 with SMTP id l10-20020a056122200a00b004b6e3fa7599mr4678993vkd.0.1705330043470; Mon, 15 Jan 2024 06:47:23 -0800 (PST) X-Google-Smtp-Source: AGHT+IH6fwAzY9p/B8Ojoob7vJlPit+LMYVgGiOaxw4BacA7x0sKclRH2EeCFfpGqDBHtgs3IUs2RQ== X-Received: by 2002:a05:6122:200a:b0:4b6:e3fa:7599 with SMTP id l10-20020a056122200a00b004b6e3fa7599mr4678977vkd.0.1705330043173; Mon, 15 Jan 2024 06:47:23 -0800 (PST) Received: from pstanner-thinkpadt14sgen1.muc.redhat.com (nat-pool-muc-t.redhat.com. [149.14.88.26]) by smtp.gmail.com with ESMTPSA id ne13-20020a056214424d00b006815cf9a644sm1020720qvb.55.2024.01.15.06.47.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Jan 2024 06:47:22 -0800 (PST) From: Philipp Stanner To: Jonathan Corbet , Hans de Goede , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Bjorn Helgaas , Philipp Stanner , Sam Ravnborg , dakr@redhat.com Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-pci@vger.kernel.org Subject: [PATCH 05/10] pci: move enabled status bit to pci_dev struct Date: Mon, 15 Jan 2024 15:46:16 +0100 Message-ID: <20240115144655.32046-7-pstanner@redhat.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240115144655.32046-2-pstanner@redhat.com> References: <20240115144655.32046-2-pstanner@redhat.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The bit describing whether the PCI device is currently enabled is stored in the devres-struct. Besides this struct being subject of a cleanup process, the device-struct is in general the right place to store this information, since it is not devres-specific. Move the 'enabled' boolean bit to struct pci_dev. Signed-off-by: Philipp Stanner --- drivers/pci/devres.c | 11 ++++------- drivers/pci/pci.c | 17 ++++++++++------- drivers/pci/pci.h | 1 - include/linux/pci.h | 1 + 4 files changed, 15 insertions(+), 15 deletions(-) diff --git a/drivers/pci/devres.c b/drivers/pci/devres.c index 1e5cf950775d..bf957f0bc5ac 100644 --- a/drivers/pci/devres.c +++ b/drivers/pci/devres.c @@ -411,7 +411,7 @@ static void pcim_release(struct device *gendev, void *res) if (this->restore_intx) pci_intx(dev, this->orig_intx); - if (this->enabled && !this->pinned) + if (!this->pinned) pci_disable_device(dev); } @@ -456,14 +456,11 @@ int pcim_enable_device(struct pci_dev *pdev) dr = get_pci_dr(pdev); if (unlikely(!dr)) return -ENOMEM; - if (dr->enabled) - return 0; rc = pci_enable_device(pdev); - if (!rc) { + if (!rc) pdev->is_managed = 1; - dr->enabled = 1; - } + return rc; } EXPORT_SYMBOL(pcim_enable_device); @@ -481,7 +478,7 @@ void pcim_pin_device(struct pci_dev *pdev) struct pci_devres *dr; dr = find_pci_dr(pdev); - WARN_ON(!dr || !dr->enabled); + WARN_ON(!dr || !pdev->enabled); if (dr) dr->pinned = 1; } diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 66639dd754c7..0fb9e7bb0e43 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1953,6 +1953,9 @@ static int do_pci_enable_device(struct pci_dev *dev, int bars) u16 cmd; u8 pin; + if (dev->enabled) + return 0; + err = pci_set_power_state(dev, PCI_D0); if (err < 0 && err != -EIO) return err; @@ -1967,7 +1970,7 @@ static int do_pci_enable_device(struct pci_dev *dev, int bars) pci_fixup_device(pci_fixup_enable, dev); if (dev->msi_enabled || dev->msix_enabled) - return 0; + goto success_out; pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); if (pin) { @@ -1977,6 +1980,8 @@ static int do_pci_enable_device(struct pci_dev *dev, int bars) cmd & ~PCI_COMMAND_INTX_DISABLE); } +success_out: + dev->enabled = true; return 0; } @@ -2146,6 +2151,9 @@ static void do_pci_disable_device(struct pci_dev *dev) { u16 pci_command; + if (!dev->enabled) + return; + pci_read_config_word(dev, PCI_COMMAND, &pci_command); if (pci_command & PCI_COMMAND_MASTER) { pci_command &= ~PCI_COMMAND_MASTER; @@ -2153,6 +2161,7 @@ static void do_pci_disable_device(struct pci_dev *dev) } pcibios_disable_device(dev); + dev->enabled = false; } /** @@ -2180,12 +2189,6 @@ void pci_disable_enabled_device(struct pci_dev *dev) */ void pci_disable_device(struct pci_dev *dev) { - struct pci_devres *dr; - - dr = find_pci_dr(dev); - if (dr) - dr->enabled = 0; - dev_WARN_ONCE(&dev->dev, atomic_read(&dev->enable_cnt) <= 0, "disabling already-disabled device"); diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 7c2181677760..dbb76a3fb0e4 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -809,7 +809,6 @@ static inline pci_power_t mid_pci_get_power_state(struct pci_dev *pdev) * when a device is enabled using managed PCI device enable interface. */ struct pci_devres { - unsigned int enabled:1; unsigned int pinned:1; unsigned int orig_intx:1; unsigned int restore_intx:1; diff --git a/include/linux/pci.h b/include/linux/pci.h index 641ee30f7d2d..a356bdcc14cc 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -367,6 +367,7 @@ struct pci_dev { this is D0-D3, D0 being fully functional, and D3 being off. */ u8 pm_cap; /* PM capability offset */ + unsigned int enabled:1; /* Whether this dev is enabled */ unsigned int imm_ready:1; /* Supports Immediate Readiness */ unsigned int pme_support:5; /* Bitmask of states from which PME# can be generated */