Commit Graph

13 Commits

Author SHA1 Message Date
Gerald Schaefer c60d1ae4ef s390/pci: introduce lazy IOTLB flushing for DMA unmap
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>
2014-07-22 09:26:24 +02:00
Gerald Schaefer 5ec6d4918a s390/pci/dma: use correct segment boundary size
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>
2014-02-21 08:48:27 +01:00
Sebastian Ott f7038b7c3f s390/pci/dma: fix accounting of allocated_pages
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>
2013-12-16 14:37:56 +01:00
Sebastian Ott 1f1dcbd4f2 s390/pci: message cleanup
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>
2013-10-24 17:17:15 +02:00
Sebastian Ott 2245932155 s390/pci: use virtual memory for iommu bitmap
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>
2013-08-30 08:57:24 +02:00
Martin Schwidefsky 9389339f28 s390/pci: cleanup function names
Rename s390pci_xyz to zpci_xxz and set_irq_ctrl to zpci_set_irq_ctrl.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-08-22 12:20:03 +02:00
Sebastian Ott 9294896e97 s390/pci: use to_pci_dev
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>
2013-06-26 21:09:59 +02:00
Gerald Schaefer 186f50fa56 s390/pci: return correct dma address for offset > PAGE_SIZE
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>
2013-04-23 10:18:16 +02:00
Sebastian Ott b2a9e87d2c s390/pci: rename instruction wrappers
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>
2013-04-17 14:07:37 +02:00
Heiko Carstens b2034e1934 s390/pci: remove dead code
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>
2013-01-08 10:57:04 +01:00
Jan Glauber d0b0885316 s390/pci: performance statistics and debug infrastructure
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>
2012-12-14 10:01:17 +01:00
Wei Yongjun bafff1743f s390/pci: fix potential NULL pointer dereference in dma_free_seg_table()
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>
2012-12-03 10:44:11 -05:00
Jan Glauber 828b35f60e s390/pci: DMA support
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>
2012-11-30 17:47:23 +01:00