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From: Amey Narkhede <ameynarkhede03@gmail.com>
To: Bjorn Helgaas <bhelgaas@google.com>
Cc: alex.williamson@redhat.com,
	Raphael Norwitz <raphael.norwitz@nutanix.com>,
	linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	kw@linux.com, Shanker Donthineni <sdonthineni@nvidia.com>,
	Sinan Kaya <okaya@kernel.org>, Len Brown <lenb@kernel.org>,
	"Rafael J . Wysocki" <rjw@rjwysocki.net>
Subject: [PATCH v14 7/9] PCI: Setup ACPI fwnode early and at the same time with OF
Date: Thu,  5 Aug 2021 02:11:59 +0530	[thread overview]
Message-ID: <20210804204201.1282-8-ameynarkhede03@gmail.com> (raw)
In-Reply-To: <20210804204201.1282-1-ameynarkhede03@gmail.com>

From: Shanker Donthineni <sdonthineni@nvidia.com>

The pci_dev objects are created through two mechanisms 1) during PCI
bus scan and 2) from I/O Virtualization. The fwnode in pci_dev object
is being set at different places depends on the type of firmware used,
device creation mechanism, and acpi_pci_bridge_d3().

The software features which have a dependency on ACPI fwnode properties
and need to be handled before device_add() will not work. One use case,
the software has to check the existence of _RST method to support ACPI
based reset method.

This patch does the two changes in order to provide fwnode consistently.
 - Set ACPI and OF fwnodes from pci_setup_device().
 - Remove pci_set_acpi_fwnode() in acpi_pci_bridge_d3().

After this patch, ACPI/OF firmware properties are visible at the same
time during the early stage of pci_dev setup. And also call sites should
be able to use firmware agnostic functions device_property_xxx() for the
early PCI quirks in the future.

Signed-off-by: Shanker Donthineni <sdonthineni@nvidia.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
---
 drivers/pci/pci-acpi.c | 1 -
 drivers/pci/probe.c    | 7 ++++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index eaddbf701759..dae021322b3f 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -952,7 +952,6 @@ static bool acpi_pci_bridge_d3(struct pci_dev *dev)
 		return false;
 
 	/* Assume D3 support if the bridge is power-manageable by ACPI. */
-	pci_set_acpi_fwnode(dev);
 	adev = ACPI_COMPANION(&dev->dev);
 
 	if (adev && acpi_device_power_manageable(adev))
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 379e85037d9b..15a6975d3757 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1789,6 +1789,9 @@ int pci_setup_device(struct pci_dev *dev)
 	dev->error_state = pci_channel_io_normal;
 	set_pcie_port_type(dev);
 
+	pci_set_of_node(dev);
+	pci_set_acpi_fwnode(dev);
+
 	pci_dev_assign_slot(dev);
 
 	/*
@@ -1924,6 +1927,7 @@ int pci_setup_device(struct pci_dev *dev)
 	default:				    /* unknown header */
 		pci_err(dev, "unknown header type %02x, ignoring device\n",
 			dev->hdr_type);
+		pci_release_of_node(dev);
 		return -EIO;
 
 	bad:
@@ -2351,10 +2355,7 @@ static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
 	dev->vendor = l & 0xffff;
 	dev->device = (l >> 16) & 0xffff;
 
-	pci_set_of_node(dev);
-
 	if (pci_setup_device(dev)) {
-		pci_release_of_node(dev);
 		pci_bus_put(dev->bus);
 		kfree(dev);
 		return NULL;
-- 
2.32.0


  parent reply	other threads:[~2021-08-04 20:42 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-04 20:41 [PATCH v14 0/9] PCI: Expose and manage PCI device reset Amey Narkhede
2021-08-04 20:41 ` [PATCH v14 1/9] PCI: Cache PCIe FLR capability Amey Narkhede
2021-08-04 20:41 ` [PATCH v14 2/9] PCI: Add pcie_reset_flr to follow calling convention of other reset methods Amey Narkhede
2021-08-04 20:41 ` [PATCH v14 3/9] PCI: Add new array for keeping track of ordering of " Amey Narkhede
2021-08-04 20:41 ` [PATCH v14 4/9] PCI: Remove reset_fn field from pci_dev Amey Narkhede
2021-08-04 20:41 ` [PATCH v14 5/9] PCI: Allow userspace to query and set device reset mechanism Amey Narkhede
2021-08-05  3:55   ` Shanker R Donthineni
2021-08-04 20:41 ` [PATCH v14 6/9] PCI: Define a function to set ACPI_COMPANION in pci_dev Amey Narkhede
2021-08-05  3:19   ` Shanker R Donthineni
2021-08-04 20:41 ` Amey Narkhede [this message]
2021-08-04 20:42 ` [PATCH v14 8/9] PCI: Add support for ACPI _RST reset method Amey Narkhede
2021-08-04 20:42 ` [PATCH v14 9/9] PCI: Change the type of probe argument in reset functions Amey Narkhede

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