Hello guys, This patchset improves ATAPI PIO/DMA data transfer handling and contains the following thirteen patches. 0001-libata-update-atapi_eh_request_sense-such-that-lb.patch 0002-cdrom-add-more-GPCMD_-constants.patch 0003-libata-rename-ATA_PROT_ATAPI_-to-ATAPI_PROT_.patch 0004-libata-add-ATAPI_-cmd-types-and-implement-atapi_cm.patch 0005-libata-improve-ATAPI-draining.patch 0006-libata-make-atapi_request_sense-use-sg.patch 0007-libata-kill-non-sg-DMA-interface.patch 0008-libata-change-ATA_QCFLAG_DMAMAP-semantics.patch 0009-libata-convert-to-chained-sg.patch 0010-libata-add-qc-dma_nbytes.patch 0011-libata-implement-ATAPI-drain-buffer.patch 0012-libata-implement-ATAPI-per-command-type-DMA-horkage.patch 0013-libata-use-PIO-for-misc-ATAPI-commands.patch 0001-0004 are miscellaneous preparation patches. 0005 improves PIO draining. This should fix regressions introduced by setting transfer chunk size to allocation size. I'll post simplified version for #upstream-fixes. 0006-0008 kills non-sg DMA paths and clean up ATA_QCFLAG_DMAMAP semantics. 0009 makes libata use chained sg instead of libata's private sg iteration mechanism. This is a clean up and will help implementing DMA and PIO-over-DMA draining. 0010 adds qc->dma_nbytes which represents actual length of buffer visible to host controller. 0011 implements DMA and PIO-over-DMA draining for misc ATAPI commands. With this change, all of my ten ATAPI devcies can cope well with shorter, matching and longer buffers. 0012 implements per-command type ATAPI DMA horkages. These horkages kick in on the first failure and don't interfere with other types of operations. This should allow libata to go on even when ATAPI DMA support is flaky. 0013 makes libata always use PIO for misc ATAPI commands. Yeah, even with all the previous patches, I think it's much better to unconditionally use PIO for misc ATAPI commands. There isn't much to lose by using PIO and IMHO it's wiser to concentrate our effort into perfecting PIO support for misc commands and DMA support for bulk data transfers. Even if this one gets NACKed now it's definitely something to think about. This patchset is against #upstream (51a7ee37eaa85b8c35fe6090618e34ed4ce1d316) + improve-speed-down patchset, take #3 [1] + improve-timing-cod-and-fix-pata_amd, take #2 [2] This patchset is also available as the following git tree. master.kernel.org:/pub/scm/linux/kernel/git/tj/libata-dev.git improve-ATAPI-data-transfer Thanks. -- tejun [1] http://thread.gmane.org/gmane.linux.ide/25406 [2] http://thread.gmane.org/gmane.linux.ide/25416 - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
