lkml.org 
[lkml]   [2016]   [Jun]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v10 5/9] genirq/msi-doorbell: msi_doorbell_safe
Date
msi_doorbell_safe returns whether all the registered doorbells
implement irq_remapping.

When assigning a PCIe device whose host controller is upstream to
an IOMMU, we currently do not know whether the MSI controller is
upstream or downstream to the IOMMU.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
include/linux/msi-doorbell.h | 12 ++++++++++++
kernel/irq/msi-doorbell.c | 14 ++++++++++++++
2 files changed, 26 insertions(+)

diff --git a/include/linux/msi-doorbell.h b/include/linux/msi-doorbell.h
index abdaaa0..648f239 100644
--- a/include/linux/msi-doorbell.h
+++ b/include/linux/msi-doorbell.h
@@ -65,6 +65,13 @@ msi_doorbell_lookup(void *chip_data);
*/
int msi_doorbell_pages(unsigned int order);

+/**
+ * msi_doorbell_safe: return whether all registered doorbells
+ * do implement irq_remapping and are safe to assign (coarse safety
+ * assessment)
+ */
+bool msi_doorbell_safe(void);
+
#else

static inline int
@@ -88,6 +95,11 @@ msi_doorbell_pages(unsigned int order)
return 0;
}

+static inline bool
+msi_doorbell_safe(void)
+{
+ return true;
+}
#endif /* CONFIG_MSI_DOORBELL */

#endif
diff --git a/kernel/irq/msi-doorbell.c b/kernel/irq/msi-doorbell.c
index 65ca9292..69121c8 100644
--- a/kernel/irq/msi-doorbell.c
+++ b/kernel/irq/msi-doorbell.c
@@ -132,3 +132,17 @@ int msi_doorbell_pages(unsigned int order)
}
EXPORT_SYMBOL_GPL(msi_doorbell_pages);

+bool msi_doorbell_safe(void)
+{
+ struct irqchip_doorbell *db;
+ bool irq_remapping = true;
+
+ mutex_lock(&irqchip_doorbell_mutex);
+ list_for_each_entry(db, &irqchip_doorbell_list, next) {
+ irq_remapping &= db->info.irq_remapping;
+ }
+ mutex_unlock(&irqchip_doorbell_mutex);
+
+ return irq_remapping;
+}
+EXPORT_SYMBOL_GPL(msi_doorbell_safe);
--
1.9.1
\
 
 \ /
  Last update: 2016-06-07 18:21    [W:0.059 / U:0.484 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site