Please apply these reverts to the v4.3 stable kernel.
We reverted the following changes from v4.6 to fix a regression:
811a4e6fce09 ("PCI: Add helpers to manage pci_dev->irq and pci_dev->irq_managed")
991de2e59090 ("PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()")
but I forgot to mark those reverts for stable. This series contains the
backports for v4.3.
For reference, the v4.6 reverts are:
fe25d078874f ("Revert "x86/PCI: Don't alloc pcibios-irq when MSI is enabled"")
67b4eab91caf ("Revert "PCI: Add helpers to manage pci_dev->irq and pci_dev->irq_managed"")
6c777e8799a9 ("Revert "PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()"")
The revert of "x86/PCI: Don't alloc pcibios-irq when MSI is enabled"
is not included in this series because that commit didn't appear until
v4.4, so it doesn't need to be reverted from v4.3.
---
Bjorn Helgaas (2):
Revert "PCI: Add helpers to manage pci_dev->irq and pci_dev->irq_managed"
Revert "PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()"
arch/x86/include/asm/pci_x86.h | 2 ++
arch/x86/pci/common.c | 20 +++++++++++---------
arch/x86/pci/intel_mid_pci.c | 9 +++------
arch/x86/pci/irq.c | 23 +++++++++++++++++++----
drivers/acpi/pci_irq.c | 17 +++++++++++++----
include/linux/pci.h | 17 -----------------
6 files changed, 48 insertions(+), 40 deletions(-)
This reverts commit 811a4e6fce09bc9239c664c6a1a53645a678c303.
Revert 811a4e6fce09 ("PCI: Add helpers to manage pci_dev->irq and
pci_dev->irq_managed").
This is part of reverting 991de2e59090 ("PCI, x86: Implement
pcibios_alloc_irq() and pcibios_free_irq()") to fix regressions it
introduced.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=111211
Fixes: 991de2e59090 ("PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()")
Signed-off-by: Bjorn Helgaas <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]>
CC: [email protected] # v4.3
CC: Jiang Liu <[email protected]>
---
arch/x86/pci/intel_mid_pci.c | 4 ++--
arch/x86/pci/irq.c | 10 ++++++----
drivers/acpi/pci_irq.c | 10 ++++++----
include/linux/pci.h | 17 -----------------
4 files changed, 14 insertions(+), 27 deletions(-)
diff --git a/arch/x86/pci/intel_mid_pci.c b/arch/x86/pci/intel_mid_pci.c
index 0d24e7c..8826ff5 100644
--- a/arch/x86/pci/intel_mid_pci.c
+++ b/arch/x86/pci/intel_mid_pci.c
@@ -215,7 +215,7 @@ static int intel_mid_pci_irq_enable(struct pci_dev *dev)
int polarity;
int ret;
- if (pci_has_managed_irq(dev))
+ if (dev->irq_managed && dev->irq > 0)
return 0;
switch (intel_mid_identify_cpu()) {
@@ -256,7 +256,7 @@ static int intel_mid_pci_irq_enable(struct pci_dev *dev)
static void intel_mid_pci_irq_disable(struct pci_dev *dev)
{
- if (pci_has_managed_irq(dev)) {
+ if (dev->irq_managed && dev->irq > 0) {
mp_unmap_irq(dev->irq);
dev->irq_managed = 0;
/*
diff --git a/arch/x86/pci/irq.c b/arch/x86/pci/irq.c
index 32e7034..72108f0 100644
--- a/arch/x86/pci/irq.c
+++ b/arch/x86/pci/irq.c
@@ -1202,7 +1202,7 @@ static int pirq_enable_irq(struct pci_dev *dev)
struct pci_dev *temp_dev;
int irq;
- if (pci_has_managed_irq(dev))
+ if (dev->irq_managed && dev->irq > 0)
return 0;
irq = IO_APIC_get_PCI_irq_vector(dev->bus->number,
@@ -1230,7 +1230,8 @@ static int pirq_enable_irq(struct pci_dev *dev)
}
dev = temp_dev;
if (irq >= 0) {
- pci_set_managed_irq(dev, irq);
+ dev->irq_managed = 1;
+ dev->irq = irq;
dev_info(&dev->dev, "PCI->APIC IRQ transform: "
"INT %c -> IRQ %d\n", 'A' + pin - 1, irq);
return 0;
@@ -1258,8 +1259,9 @@ static int pirq_enable_irq(struct pci_dev *dev)
static void pirq_disable_irq(struct pci_dev *dev)
{
- if (io_apic_assign_pci_irqs && pci_has_managed_irq(dev)) {
+ if (io_apic_assign_pci_irqs && dev->irq_managed && dev->irq) {
mp_unmap_irq(dev->irq);
- pci_reset_managed_irq(dev);
+ dev->irq = 0;
+ dev->irq_managed = 0;
}
}
diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
index c933675..172b74d 100644
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -409,7 +409,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
return 0;
}
- if (pci_has_managed_irq(dev))
+ if (dev->irq_managed && dev->irq > 0)
return 0;
entry = acpi_pci_irq_lookup(dev, pin);
@@ -454,7 +454,8 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
kfree(entry);
return rc;
}
- pci_set_managed_irq(dev, rc);
+ dev->irq = rc;
+ dev->irq_managed = 1;
if (link)
snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
@@ -477,7 +478,7 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
u8 pin;
pin = dev->pin;
- if (!pin || !pci_has_managed_irq(dev))
+ if (!pin || !dev->irq_managed || dev->irq <= 0)
return;
entry = acpi_pci_irq_lookup(dev, pin);
@@ -499,6 +500,7 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
if (gsi >= 0) {
acpi_unregister_gsi(gsi);
- pci_reset_managed_irq(dev);
+ dev->irq_managed = 0;
+ dev->irq = 0;
}
}
diff --git a/include/linux/pci.h b/include/linux/pci.h
index e90eb22..577c5fd 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -978,23 +978,6 @@ static inline int pci_is_managed(struct pci_dev *pdev)
return pdev->is_managed;
}
-static inline void pci_set_managed_irq(struct pci_dev *pdev, unsigned int irq)
-{
- pdev->irq = irq;
- pdev->irq_managed = 1;
-}
-
-static inline void pci_reset_managed_irq(struct pci_dev *pdev)
-{
- pdev->irq = 0;
- pdev->irq_managed = 0;
-}
-
-static inline bool pci_has_managed_irq(struct pci_dev *pdev)
-{
- return pdev->irq_managed && pdev->irq > 0;
-}
-
void pci_disable_device(struct pci_dev *dev);
extern unsigned int pcibios_max_latency;
This reverts commit 991de2e59090e55c65a7f59a049142e3c480f7bd.
991de2e59090 ("PCI, x86: Implement pcibios_alloc_irq() and
pcibios_free_irq()") appeared in v4.3 and helps support IOAPIC hotplug.
Олег reported that the Elcus-1553 TA1-PCI driver worked in v4.2 but not
v4.3 and bisected it to 991de2e59090. Sunjin reported that the RocketRAID
272x driver worked in v4.2 but not v4.3. In both cases booting with
"pci=routirq" is a workaround.
I think the problem is that after 991de2e59090, we no longer call
pcibios_enable_irq() for upstream bridges. Prior to 991de2e59090, when a
driver called pci_enable_device(), we recursively called
pcibios_enable_irq() for upstream bridges via pci_enable_bridge().
After 991de2e59090, we call pcibios_enable_irq() from pci_device_probe()
instead of the pci_enable_device() path, which does *not* call
pcibios_enable_irq() for upstream bridges.
Revert 991de2e59090 to fix these driver regressions.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=111211
Fixes: 991de2e59090 ("PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()")
Reported-and-tested-by: Олег Мороз <[email protected]>
Reported-by: Sunjin Yang <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]>
CC: [email protected] # v4.3
CC: Jiang Liu <[email protected]>
---
arch/x86/include/asm/pci_x86.h | 2 ++
arch/x86/pci/common.c | 20 +++++++++++---------
arch/x86/pci/intel_mid_pci.c | 7 ++-----
arch/x86/pci/irq.c | 15 ++++++++++++++-
drivers/acpi/pci_irq.c | 9 ++++++++-
5 files changed, 37 insertions(+), 16 deletions(-)
diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
index fa1195d..164e3f8 100644
--- a/arch/x86/include/asm/pci_x86.h
+++ b/arch/x86/include/asm/pci_x86.h
@@ -93,6 +93,8 @@ extern raw_spinlock_t pci_config_lock;
extern int (*pcibios_enable_irq)(struct pci_dev *dev);
extern void (*pcibios_disable_irq)(struct pci_dev *dev);
+extern bool mp_should_keep_irq(struct device *dev);
+
struct pci_raw_ops {
int (*read)(unsigned int domain, unsigned int bus, unsigned int devfn,
int reg, int len, u32 *val);
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index dc78a4a..8fd6f44 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -673,20 +673,22 @@ int pcibios_add_device(struct pci_dev *dev)
return 0;
}
-int pcibios_alloc_irq(struct pci_dev *dev)
+int pcibios_enable_device(struct pci_dev *dev, int mask)
{
- return pcibios_enable_irq(dev);
-}
+ int err;
-void pcibios_free_irq(struct pci_dev *dev)
-{
- if (pcibios_disable_irq)
- pcibios_disable_irq(dev);
+ if ((err = pci_enable_resources(dev, mask)) < 0)
+ return err;
+
+ if (!pci_dev_msi_enabled(dev))
+ return pcibios_enable_irq(dev);
+ return 0;
}
-int pcibios_enable_device(struct pci_dev *dev, int mask)
+void pcibios_disable_device (struct pci_dev *dev)
{
- return pci_enable_resources(dev, mask);
+ if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq)
+ pcibios_disable_irq(dev);
}
int pci_ext_cfg_avail(void)
diff --git a/arch/x86/pci/intel_mid_pci.c b/arch/x86/pci/intel_mid_pci.c
index 8826ff5..8b93e63 100644
--- a/arch/x86/pci/intel_mid_pci.c
+++ b/arch/x86/pci/intel_mid_pci.c
@@ -256,13 +256,10 @@ static int intel_mid_pci_irq_enable(struct pci_dev *dev)
static void intel_mid_pci_irq_disable(struct pci_dev *dev)
{
- if (dev->irq_managed && dev->irq > 0) {
+ if (!mp_should_keep_irq(&dev->dev) && dev->irq_managed &&
+ dev->irq > 0) {
mp_unmap_irq(dev->irq);
dev->irq_managed = 0;
- /*
- * Don't reset dev->irq here, otherwise
- * intel_mid_pci_irq_enable() will fail on next call.
- */
}
}
diff --git a/arch/x86/pci/irq.c b/arch/x86/pci/irq.c
index 72108f0..9bd1154 100644
--- a/arch/x86/pci/irq.c
+++ b/arch/x86/pci/irq.c
@@ -1257,9 +1257,22 @@ static int pirq_enable_irq(struct pci_dev *dev)
return 0;
}
+bool mp_should_keep_irq(struct device *dev)
+{
+ if (dev->power.is_prepared)
+ return true;
+#ifdef CONFIG_PM
+ if (dev->power.runtime_status == RPM_SUSPENDING)
+ return true;
+#endif
+
+ return false;
+}
+
static void pirq_disable_irq(struct pci_dev *dev)
{
- if (io_apic_assign_pci_irqs && dev->irq_managed && dev->irq) {
+ if (io_apic_assign_pci_irqs && !mp_should_keep_irq(&dev->dev) &&
+ dev->irq_managed && dev->irq) {
mp_unmap_irq(dev->irq);
dev->irq = 0;
dev->irq_managed = 0;
diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
index 172b74d..8a10a7a 100644
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -481,6 +481,14 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
if (!pin || !dev->irq_managed || dev->irq <= 0)
return;
+ /* Keep IOAPIC pin configuration when suspending */
+ if (dev->dev.power.is_prepared)
+ return;
+#ifdef CONFIG_PM
+ if (dev->dev.power.runtime_status == RPM_SUSPENDING)
+ return;
+#endif
+
entry = acpi_pci_irq_lookup(dev, pin);
if (!entry)
return;
@@ -501,6 +509,5 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
if (gsi >= 0) {
acpi_unregister_gsi(gsi);
dev->irq_managed = 0;
- dev->irq = 0;
}
}