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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: linux-pci@vger.kernel.org
Cc: Bjorn Helgaas <helgaas@kernel.org>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Sinan Kaya <okaya@kernel.org>, Ali Saidi <alisaidi@amazon.com>,
	Zeev Zilberman <zeev@amazon.com>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: [PATCH 3/4] pci: Do not auto-enable PCI reallocation when _DSM #5 returns 0
Date: Sat, 15 Jun 2019 10:23:58 +1000	[thread overview]
Message-ID: <20190615002359.29577-3-benh@kernel.crashing.org> (raw)
In-Reply-To: <20190615002359.29577-1-benh@kernel.crashing.org>

This prevents auto-enabling of bridges reallocation when the FW tells
us that the initial configuration must be preserved for a given host
bridge.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 drivers/pci/setup-bus.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 0cdd5ff389de..049a5602b942 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1684,10 +1684,16 @@ static enum enable_type pci_realloc_detect(struct pci_bus *bus,
 					   enum enable_type enable_local)
 {
 	bool unassigned = false;
+	struct pci_host_bridge *hb;
 
 	if (enable_local != undefined)
 		return enable_local;
 
+	/* Don't realloc if ACPI tells us not to */
+	hb = pci_find_host_bridge(bus);
+	if (hb->preserve_config)
+		return auto_disabled;
+
 	pci_walk_bus(bus, iov_resources_unassigned, &unassigned);
 	if (unassigned)
 		return auto_enabled;
-- 
2.17.1


WARNING: multiple messages have this Message-ID (diff)
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: linux-pci@vger.kernel.org
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Sinan Kaya <okaya@kernel.org>, Zeev Zilberman <zeev@amazon.com>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	Bjorn Helgaas <helgaas@kernel.org>,
	Ali Saidi <alisaidi@amazon.com>
Subject: [PATCH 3/4] pci: Do not auto-enable PCI reallocation when _DSM #5 returns 0
Date: Sat, 15 Jun 2019 10:23:58 +1000	[thread overview]
Message-ID: <20190615002359.29577-3-benh@kernel.crashing.org> (raw)
In-Reply-To: <20190615002359.29577-1-benh@kernel.crashing.org>

This prevents auto-enabling of bridges reallocation when the FW tells
us that the initial configuration must be preserved for a given host
bridge.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 drivers/pci/setup-bus.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 0cdd5ff389de..049a5602b942 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1684,10 +1684,16 @@ static enum enable_type pci_realloc_detect(struct pci_bus *bus,
 					   enum enable_type enable_local)
 {
 	bool unassigned = false;
+	struct pci_host_bridge *hb;
 
 	if (enable_local != undefined)
 		return enable_local;
 
+	/* Don't realloc if ACPI tells us not to */
+	hb = pci_find_host_bridge(bus);
+	if (hb->preserve_config)
+		return auto_disabled;
+
 	pci_walk_bus(bus, iov_resources_unassigned, &unassigned);
 	if (unassigned)
 		return auto_enabled;
-- 
2.17.1


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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2019-06-15  0:30 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-15  0:23 [PATCH 1/4] arm64: pci: acpi: Use pci_assign_unassigned_root_bus_resources() Benjamin Herrenschmidt
2019-06-15  0:23 ` Benjamin Herrenschmidt
2019-06-15  0:23 ` [PATCH 2/4] pci: acpi: Read _DSM #5 from ACPI on root bridges Benjamin Herrenschmidt
2019-06-15  0:23   ` Benjamin Herrenschmidt
2019-06-21 20:07   ` Bjorn Helgaas
2019-06-21 20:07     ` Bjorn Helgaas
2019-06-15  0:23 ` Benjamin Herrenschmidt [this message]
2019-06-15  0:23   ` [PATCH 3/4] pci: Do not auto-enable PCI reallocation when _DSM #5 returns 0 Benjamin Herrenschmidt
2019-06-21 20:07   ` Bjorn Helgaas
2019-06-21 20:07     ` Bjorn Helgaas
2019-06-15  0:23 ` [PATCH 4/4] arm64: pci: acpi: Preserve PCI resources configuration when asked by ACPI Benjamin Herrenschmidt
2019-06-15  0:23   ` Benjamin Herrenschmidt
2019-06-21 14:57   ` Lorenzo Pieralisi
2019-06-21 14:57     ` Lorenzo Pieralisi
2019-06-21 23:07     ` Benjamin Herrenschmidt
2019-06-21 23:07       ` Benjamin Herrenschmidt
2019-06-21 15:44   ` Ard Biesheuvel
2019-06-21 15:44     ` Ard Biesheuvel
2019-06-21 20:08   ` Bjorn Helgaas
2019-06-21 20:08     ` Bjorn Helgaas
2019-06-20 17:13 ` [PATCH 1/4] arm64: pci: acpi: Use pci_assign_unassigned_root_bus_resources() Lorenzo Pieralisi
2019-06-20 17:13   ` Lorenzo Pieralisi
2019-06-20 22:55   ` Benjamin Herrenschmidt
2019-06-20 22:55     ` Benjamin Herrenschmidt
2019-06-21 20:06 ` Bjorn Helgaas
2019-06-21 20:06   ` Bjorn Helgaas
2019-06-21 20:48 ` Bjorn Helgaas
2019-06-21 20:48   ` Bjorn Helgaas
2019-06-21 22:58   ` Benjamin Herrenschmidt
2019-06-21 22:58     ` Benjamin Herrenschmidt
2019-06-21 23:00   ` Benjamin Herrenschmidt
2019-06-21 23:00     ` Benjamin Herrenschmidt
2019-06-21 23:15     ` Bjorn Helgaas
2019-06-21 23:15       ` Bjorn Helgaas

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