linux

iv/linux

History

Jeffrey Hugo 2230428fb8 PCI: hv: Fix interrupt mapping for multi-MSI

commit a2bad844a67b1c7740bda63e87453baf63c3a7f7 upstream.

According to Dexuan, the hypervisor folks beleive that multi-msi
allocations are not correct.  compose_msi_msg() will allocate multi-msi
one by one.  However, multi-msi is a block of related MSIs, with alignment
requirements.  In order for the hypervisor to allocate properly aligned
and consecutive entries in the IOMMU Interrupt Remapping Table, there
should be a single mapping request that requests all of the multi-msi
vectors in one shot.

Dexuan suggests detecting the multi-msi case and composing a single
request related to the first MSI.  Then for the other MSIs in the same
block, use the cached information.  This appears to be viable, so do it.

5.4 backport - add hv_msi_get_int_vector helper function. Fixed merge
conflict due to delivery_mode name change (APIC_DELIVERY_MODE_FIXED
is the value given to dest_Fixed). Removed unused variable in
hv_compose_msi_msg. Fixed reference to msi_desc->pci to point to
the same is_msix variable. Removed changes to compose_msi_req_v3 since
it doesn't exist yet.

Suggested-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Dexuan Cui <decui@microsoft.com>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/1652282599-21643-1-git-send-email-quic_jhugo@quicinc.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Carl Vanderlip <quic_carlv@quicinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2022-07-29 17:14:09 +02:00

controller

PCI: hv: Fix interrupt mapping for multi-MSI

2022-07-29 17:14:09 +02:00

endpoint

PCI: endpoint: Fix missing destroy_workqueue()

2021-05-19 10:08:25 +02:00

hotplug

PCI: pciehp: Add Qualcomm quirk for Command Completed erratum

2022-04-15 14:18:33 +02:00

pcie

PCI/portdrv: Enable Bandwidth Notification only if port supports it