linux.git/drivers/pci/endpoint, branch v5.7.15

PCI: endpoint: functions/pci-epf-test: Fix DMA channel release

2020-06-24T15:48:20+00:00

[ Upstream commit 0e86d981f9b7252e9716c5137cd8e4d9ad8ef32f ]

When unbinding pci_epf_test, pci_epf_test_clean_dma_chan() is called in
pci_epf_test_unbind() even though epf_test->dma_supported is false.

As a result, dma_release_channel() will trigger a NULL pointer
dereference because dma_chan is not set.

Avoid calling dma_release_channel() if epf_test->dma_supported
is false.

Link: https://lore.kernel.org/r/1587540287-10458-1-git-send-email-hayashi.kunihiko@socionext.com
Fixes: 5ebf3fc59bd2 ("PCI: endpoint: functions/pci-epf-test: Add DMA support to transfer data")
Signed-off-by: Kunihiko Hayashi 
[lorenzo.pieralisi@arm.com: commit log]
Signed-off-by: Lorenzo Pieralisi 
Acked-by: Kishon Vijay Abraham I 
Signed-off-by: Sasha Levin

PCI: dwc: Fix dw_pcie_ep_raise_msix_irq() to get correct MSI-X table address

2020-04-02T16:57:10+00:00

commit beb4641a787d ("PCI: dwc: Add MSI-X callbacks handler"),
in order to raise MSI-X interrupt, obtained MSIX table address from
Base Address Register (BAR). However BAR only holds PCI address
programmed by the host whereas the MSI-X table should be in the local
memory.

Store the MSI-X table address (virtual address) as part of ->set_bar()
callback and use that to get the message address and message data
here.

Fixes: beb4641a787d ("PCI: dwc: Add MSI-X callbacks handler")
Signed-off-by: Kishon Vijay Abraham I 
Signed-off-by: Lorenzo Pieralisi

PCI: endpoint: Fix ->set_msix() to take BIR and offset as arguments

2020-04-02T16:57:10+00:00

commit 8963106eabdc ("PCI: endpoint: Add MSI-X interfaces") while
adding support to raise MSI-X interrupts from endpoint didn't include
BAR Indicator register (BIR) configuration and MSI-X table offset as
arguments in pci_epc_set_msix(). This would result in endpoint
controller register using random BAR indicator register, the memory
for which might not be allocated by the endpoint function driver.
Add BAR indicator register and MSI-X table offset as arguments in
pci_epc_set_msix() and allocate space for MSI-X table and pending
bit array (PBA) in pci-epf-test endpoint function driver.

Fixes: 8963106eabdc ("PCI: endpoint: Add MSI-X interfaces")
Signed-off-by: Kishon Vijay Abraham I 
Signed-off-by: Lorenzo Pieralisi

PCI: endpoint: functions/pci-epf-test: Print throughput information

2020-04-02T16:57:10+00:00

Print throughput information in KB/s after every completed transfer,
including information on whether DMA is used or not.

Signed-off-by: Kishon Vijay Abraham I 
Signed-off-by: Lorenzo Pieralisi 
Tested-by: Alan Mikhak

PCI: endpoint: functions/pci-epf-test: Add DMA support to transfer data

2020-04-02T16:57:01+00:00

Use dmaengine API and add support for transferring data using DMA.

Signed-off-by: Kishon Vijay Abraham I 
Signed-off-by: Lorenzo Pieralisi 
Tested-by: Alan Mikhak

PCI: endpoint: Fix clearing start entry in configfs

2020-03-31T08:13:27+00:00

After an endpoint is started through configfs, if 0 is written to the
configfs entry 'start', the controller stops but the epc_group->start
value remains 1.

A subsequent unlinking of the function from the controller would trigger
a spurious WARN_ON_ONCE() in pci_epc_epf_unlink() despite right
behavior.

Fix it by setting epc_group->start = 0 when a controller is stopped
using configfs.

Fixes: d74679911610 ("PCI: endpoint: Introduce configfs entry for configuring EP functions")
Signed-off-by: Kunihiko Hayashi 
Signed-off-by: Lorenzo Pieralisi 
Acked-by: Kishon Vijay Abraham I 
Cc: Kishon Vijay Abraham I

PCI: pci-epf-test: Add support to defer core initialization

2020-02-26T09:58:41+00:00

Add support to defer core initialization for the endpoint mode of
operation.

This would enable support for implementations where the core
initialization needs to be deferred until the PCIe reference clock is
available from the host system.

Signed-off-by: Vidya Sagar 
[lorenzo.pieralisi@arm.com: commit log]
Signed-off-by: Lorenzo Pieralisi 
Acked-by: Kishon Vijay Abraham I

PCI: endpoint: Add notification for core init completion

2020-02-25T12:02:25+00:00

Add support to send notifications to EPF from EPC once the core
registers initialization is complete.

Signed-off-by: Vidya Sagar 
Signed-off-by: Lorenzo Pieralisi 
Acked-by: Kishon Vijay Abraham I

PCI: endpoint: Assign function number for each PF in EPC core

2020-02-24T10:15:45+00:00

The PCIe endpoint core relies on the drivers that invoke the
pci_epc_add_epf() API to allocate and assign a function number
to each physical function (PF). Since endpoint function device can
be created by multiple mechanisms (configfs, devicetree, etc..),
allowing each of these mechanisms to assign a function number
would result in mutliple endpoint function devices having the
same function number. In order to avoid this, let EPC core assign
a function number to the endpoint device.

Signed-off-by: Kishon Vijay Abraham I 
Signed-off-by: Lorenzo Pieralisi

PCI: endpoint: Protect concurrent access to pci_epf_ops with mutex

2020-02-24T10:15:33+00:00

Protect concurrent access to pci_epf_ops with a mutex.

Signed-off-by: Kishon Vijay Abraham I 
Signed-off-by: Lorenzo Pieralisi