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path: root/arch/s390/pci/pci_dma.c
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* s390/pci: extract software counters from fmbSebastian Ott2015-04-151-4/+4
| | | | | | | | | | The software counters are not a part of the function measurement block. Also we do not check for zdev->fmb != NULL when using these counters (function measurement can be toggled at runtime). Just move the software counters to struct zpci_dev. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/pci: introduce lazy IOTLB flushing for DMA unmapGerald Schaefer2014-07-221-14/+36
| | | | | | | | | | | | | | | This changes the default IOTLB flushing method to lazy flushing, which means that there will be no direct flush after each DMA unmap operation. Instead, the iommu bitmap pointer will be adjusted after unmap, so that no DMA address will be re-used until after an iommu bitmap wrap-around. The only IOTLB flush will then happen after each wrap-around. A new kernel parameter "s390_iommu=" is also introduced, to allow changing the flushing behaviour to the old strict method. Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/pci/dma: use correct segment boundary sizeGerald Schaefer2014-02-211-3/+5
| | | | | | | | | | | The boundary size for iommu_area_alloc() is currently set to a constant value. This is wrong, we shouldn't use a constant value but rather the return value of dma_get_seg_boundary(), since a device driver can override the default. Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/pci/dma: fix accounting of allocated_pagesSebastian Ott2013-12-161-5/+8
| | | | | | | | | | | allocated_pages sometimes are increased even if s390_dma_alloc fails also this value is never decreased even if s390_dma_free is called. This patch fixes these bugs. Also remove the atomic64_t casts (the members are already of this type). Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/pci: message cleanupSebastian Ott2013-10-241-10/+8
| | | | | | | | | Cleanup arch specific pci messages. Remove unhelpful messages and replace others with entries in the debugfs. Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/pci: use virtual memory for iommu bitmapSebastian Ott2013-08-301-9/+3
| | | | | | | | | | The bitmap used to mark dma mappings can be quite large on systems with huge amounts of memory. Use virtual memory for this bitmap. Suggested-by: Alexander Schmidt <alexschm@de.ibm.com> Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/pci: cleanup function namesMartin Schwidefsky2013-08-221-2/+2
| | | | | | Rename s390pci_xyz to zpci_xxz and set_irq_ctrl to zpci_set_irq_ctrl. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/pci: use to_pci_devSebastian Ott2013-06-261-3/+3
| | | | | | | | | Use the to_pci_dev macro to fetch a pci_dev from a struct device pointer. Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/pci: return correct dma address for offset > PAGE_SIZEGerald Schaefer2013-04-231-3/+1
| | | | | | | | | | | For offset > PAGE_SIZE, s390_dma_map_pages() will issue a warning and return a wrong dma address. This patch removes the warning and fixes the dma return address calculation. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/pci: rename instruction wrappersSebastian Ott2013-04-171-2/+3
| | | | | | | | | Use distinct (and hopefully sane) names for the pci instruction wrappers. Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/pci: remove dead codeHeiko Carstens2013-01-081-2/+0
| | | | | | | | | | Get rid of these: arch/s390/pci/pci_dma.c:16:29: warning: ‘zpci_ioat_dt’ defined but not used [-Wunused-variable] arch/s390/pci/pci.c:164:12: warning: ‘zpci_store_fib’ defined but not used [-Wunused-function] Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/pci: performance statistics and debug infrastructureJan Glauber2012-12-141-1/+7
| | | | | | | | | Add support for reading the PCI function measurement block counters provided by the hypervisor. Add two s390 debug features, one for critical errors and one for tracing and provide wrappers to log data. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/pci: fix potential NULL pointer dereference in dma_free_seg_table()Wei Yongjun2012-12-031-1/+2
| | | | | | | The dereference to 'zdev' should be moved below the NULL test. Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/pci: DMA supportJan Glauber2012-11-301-0/+505
Add DMA IOMMU support using 4K page table entries. Implement dma_map_ops. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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