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Wed, 05 Jun 2024 01:16:23 -0700 (PDT) Received: from pstanner-thinkpadt14sgen1.fritz.box ([2001:9e8:32e6:e600:c901:4daf:2476:80ad]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-35dd0630010sm13739163f8f.76.2024.06.05.01.16.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Jun 2024 01:16:22 -0700 (PDT) From: Philipp Stanner To: Hans de Goede , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Bjorn Helgaas , Sam Ravnborg , dakr@redhat.com Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Philipp Stanner Subject: [PATCH v7 07/13] PCI: Move dev-enabled status bit to struct pci_dev Date: Wed, 5 Jun 2024 10:15:59 +0200 Message-ID: <20240605081605.18769-9-pstanner@redhat.com> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20240605081605.18769-2-pstanner@redhat.com> References: <20240605081605.18769-2-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 struct pci_devres. Besides this struct being subject of a cleanup process, struct pci_device 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 572a4e193879..ea590caf8995 100644 --- a/drivers/pci/devres.c +++ b/drivers/pci/devres.c @@ -398,7 +398,7 @@ 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); } @@ -441,14 +441,11 @@ 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); @@ -466,7 +463,7 @@ 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 8dd711b9a291..04accdfab7ce 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2011,6 +2011,9 @@ 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; @@ -2025,7 +2028,7 @@ 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) { @@ -2035,6 +2038,8 @@ static int do_pci_enable_device(struct pci_dev *dev, int bars) cmd & ~PCI_COMMAND_INTX_DISABLE); } +success_out: + dev->enabled = true; return 0; } @@ -2193,6 +2198,9 @@ 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; @@ -2200,6 +2208,7 @@ static void do_pci_disable_device(struct pci_dev *dev) } pcibios_disable_device(dev); + dev->enabled = false; } /** @@ -2227,12 +2236,6 @@ 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 9fd50bc99e6b..e223e0f7dada 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -823,7 +823,6 @@ static inline pci_power_t mid_pci_get_power_state(struct pci_dev *pdev) * then remove them from here. */ 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 16493426a04f..110548f00b3b 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 */