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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next prev parent reply other threads:[~2019-06-15 0:30 UTC|newest]
Thread overview: 17+ 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 ` [PATCH 2/4] pci: acpi: Read _DSM #5 from ACPI on root bridges Benjamin Herrenschmidt
2019-06-21 20:07 ` Bjorn Helgaas
2019-06-15 0:23 ` Benjamin Herrenschmidt [this message]
2019-06-21 20:07 ` [PATCH 3/4] pci: Do not auto-enable PCI reallocation when _DSM #5 returns 0 Bjorn Helgaas
2019-06-15 0:23 ` [PATCH 4/4] arm64: pci: acpi: Preserve PCI resources configuration when asked by ACPI Benjamin Herrenschmidt
2019-06-21 14:57 ` Lorenzo Pieralisi
2019-06-21 23:07 ` Benjamin Herrenschmidt
2019-06-21 15:44 ` Ard Biesheuvel
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 22:55 ` Benjamin Herrenschmidt
2019-06-21 20:06 ` Bjorn Helgaas
2019-06-21 20:48 ` Bjorn Helgaas
2019-06-21 22:58 ` Benjamin Herrenschmidt
2019-06-21 23:00 ` Benjamin Herrenschmidt
2019-06-21 23:15 ` Bjorn Helgaas
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