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When performing DMA operations on a MCB device, the device needed
for using the DMA API is "mcb_device->bus_carrier".
This is rather lengthy, so a shortcut is introduced to struct mcb_device
in order to ensure the MCB device driver uses the correct device for DMA
operations.
Signed-off-by: Michael Moese <michael.moese@men.de>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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The MEN Chameleon specification states that a chameleon FPGA can include a
bridge descriptor, which then opens up a new bus behind this bridge. MCB
included subdevice handling code in the core, but no support for bus
descriptors in the parser, due to a lack of hardware access.
As this is technically dead code, but it gets executed on a device add,
I've decided to remove it.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Acquire a reference to the carrier's kernel module in bus code, so
it can't be removed from the kernel while it still has a bus and thus
possibly devices attached to it.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reported-by: Andreas Werner <andreas.werner@men.de>
Tested-by: Andreas Werner <andreas.werner@men.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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mcb_probe() does not aqcuire a reference to the probed device but drops one
when removing the device. As it is actually using the device, it should grab
a reference via get_device().
This could lead to a panic found with a rmmod/modprobe stress test
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reported-by: Andreas Werner <andreas.werner@men.de>
Tested-by: Andreas Werner <andreas.werner@men.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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The mcb_bus structure previously was released in mcb_release_bus. This lead to
the following warning on module unload:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 2032 at drivers/base/core.c:251 device_release+0x73/0x90
Device 'mcb:0' does not have a release() function, it is broken and must be fixed.
Modules linked in: men_z135_uart mcb_pci(-) mcb
CPU: 1 PID: 2032 Comm: rmmod Not tainted 4.6.0-rc4+ #3
Hardware name: N/A N/A/COMe-mBTi10, BIOS MVV1R921 X64 10/14/2015
00000286 00000286 c0117de4 c12d6f16 c0117e2c c18be0d3 c0117dfc c104f6e1
000000fb f5ccbe08 f5ccbe00 f5c64600 c0117e18 c104f728 00000009 00000000
c0117e10 c18db674 c0117e2c c0117e3c c13ce5c3 c18be0d3 000000fb c18db674
Call Trace:
[<c12d6f16>] dump_stack+0x47/0x61
[<c104f6e1>] __warn+0xc1/0xe0
[<c104f728>] warn_slowpath_fmt+0x28/0x30
[<c13ce5c3>] device_release+0x73/0x90
[<c12d92e4>] kobject_release+0x34/0x80
[<c12d929d>] ? kobject_del+0x2d/0x40
[<c12d9205>] kobject_put+0x25/0x50
[<c13ce77f>] put_device+0xf/0x20
[<c13d114b>] klist_devices_put+0xb/0x10
[<c1752673>] klist_next+0x73/0xf0
[<c13d1140>] ? unbind_store+0x100/0x100
[<f8a23370>] ? mcb_bus_add_devices+0x30/0x30 [mcb]
[<c13d0a81>] bus_for_each_dev+0x51/0x80
[<f8a23319>] mcb_release_bus+0x19/0x40 [mcb]
[<f8a23370>] ? mcb_bus_add_devices+0x30/0x30 [mcb]
[<f8a2b033>] mcb_pci_remove+0x13/0x20 [mcb_pci]
[<c130d358>] pci_device_remove+0x28/0xb0
[<c13d201b>] __device_release_driver+0x7b/0x110
[<c13d2847>] driver_detach+0x87/0x90
[<c13d1b9b>] bus_remove_driver+0x3b/0x80
[<c13d2ed0>] driver_unregister+0x20/0x50
[<c130be53>] pci_unregister_driver+0x13/0x60
[<f8a2b1f4>] mcb_pci_driver_exit+0xd/0xf [mcb_pci]
[<c10be588>] SyS_delete_module+0x138/0x200
[<c1159208>] ? ____fput+0x8/0x10
[<c1068054>] ? task_work_run+0x74/0x90
[<c1001879>] do_fast_syscall_32+0x69/0x120
[<c1757597>] sysenter_past_esp+0x40/0x6a
---[ end trace 1ed34c2aa3019875 ]---
Release a mcb_bus' memory on the device's release callback, to avoid above
warning.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reported-by: Andreas Werner <andreas.werner@men.de>
Tested-by: Andreas Werner <andreas.werner@men.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Export information about the bus stored in the FPGA's header to userspace via
sysfs, instead of hiding it in pr_debug()s from everyone.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Andreas Werner <andreas.werner@men.de>
Tested-by: Andreas Werner <andreas.werner@men.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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The mcb bus' device member wasn't correctly initialized and thus wasn't placed
correctly into the driver model.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Andreas Werner <andreas.werner@men.de>
Tested-by: Andreas Werner <andreas.werner@men.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Destroy mcb_ida on module_unload
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Add support for shared PCI IRQs to mcb and mcb-pci.
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@men.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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The MCB (MEN Chameleon Bus) is a Bus specific to MEN Mikroelektronik
FPGA based devices. It is used to identify MCB based IP-Cores within
an FPGA and provide the necessary framework for instantiating drivers
for these devices.
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@men.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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