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| author | Niklas Schnelle <schnelle@linux.ibm.com> | 2021-07-16 12:53:37 +0300 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2021-08-25 12:03:34 +0300 |
| commit | 1f3f76812d5dfc791193b39c2140a8bd09962c0e (patch) | |
| tree | 8f61dd33029e218e765af3ad8753856ad6d5881b /arch/s390/pci/pci_event.c | |
| parent | cc049eecfb7adc4bfecd05eb25e425d8def96fce (diff) | |
| download | linux-1f3f76812d5dfc791193b39c2140a8bd09962c0e.tar.xz | |
s390/pci: improve DMA translation init and exit
Currently zpci_dma_init_device()/zpci_dma_exit_device() is called as
part of zpci_enable_device()/zpci_disable_device() and errors for
zpci_dma_exit_device() are always ignored even if we could abort.
Improve upon this by moving zpci_dma_exit_device() out of
zpci_disable_device() and check for errors whenever we have a way to
abort the current operation. Note that for example in
zpci_event_hard_deconfigured() the device is expected to be gone so we
really can't abort and proceed even in case of error.
Similarly move the cc == 3 special case out of zpci_unregister_ioat()
and into the callers allowing to abort when finding an already disabled
devices precludes proceeding with the operation.
While we are at it log IOAT register/unregister errors in the s390
debugfs log,
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/pci/pci_event.c')
| -rw-r--r-- | arch/s390/pci/pci_event.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/s390/pci/pci_event.c b/arch/s390/pci/pci_event.c index cd447b96b4b1..c856f80cb21b 100644 --- a/arch/s390/pci/pci_event.c +++ b/arch/s390/pci/pci_event.c @@ -84,7 +84,10 @@ static void zpci_event_hard_deconfigured(struct zpci_dev *zdev, u32 fh) /* Even though the device is already gone we still * need to free zPCI resources as part of the disable. */ - zpci_disable_device(zdev); + if (zdev->dma_table) + zpci_dma_exit_device(zdev); + if (zdev_enabled(zdev)) + zpci_disable_device(zdev); zdev->state = ZPCI_FN_STATE_STANDBY; } |