On 10/31/2018 5:29 PM, Alejandro Lucero wrote: > A patchset sent introducing DMA mask checks has several critical > issues precluding apps to execute. The patchset was reviewed and > finally accepted after three versions. Obviously it did not go > through the proper testing what can be explained, at least from my > side, due to the big changes to the memory initialization code these > last months. It turns out the patchset did work with legacy memory > and I'm afraid that was mainly my testing. > > This patchset should solve the main problems reported: > > - deadlock duriing initialization > - segmentation fault with secondary processes > > For solving the deadlock, a new API is introduced: > > rte_mem_check_dma_mask_safe/unsafe > > making the previous rte_mem_check_dma_mask the one those new functions > end calling. A boolean param is used for calling rte_memseg_walk thread > safe or thread unsafe. This second option is needed for avoiding the > deadlock. > > For the secondary processes problem, the call to check the dma mask is > avoided from code being executed before the memory initialization. > Instead, a new API function, rte_mem_set_dma_mask is introduced, which > will be used in those cases. The dma mask check is done once the memory > initialization is completed. > > This last change implies the IOVA mode can not be set depending on IOMMU > hardware limitations, and it is assumed IOVA VA is possible. If the dma > mask check reports a problem after memory initilization, the error > message includes now advice for trying with --iova-mode option set to > pa. > > The patchet also includes the dma mask check for legacy memory and the > no hugepage option. > > Finally, all the DMA mask API has been updated for using the same prefix > than other EAL memory code. > > An initial version of this patchset has been tested by Intel DPDK > Validation team and it seems it solves all the problems reported. This > final patchset has the same functionality with minor changes. I have > successfully tested the patchset with my limited testbench. > > Alejandro Lucero (7): > mem: fix call to DMA mask check > mem: use proper prefix > mem: add function for setting DMA mask > bus/pci: avoid call to DMA mask check > mem: modify error message for DMA mask check > mem: add safe and unsafe versions for checking DMA mask > eal/mem: use DMA mask check for legacy memory
Tested-by: Ferruh Yigit <ferruh.yi...@intel.com>
