d/numam-dpdk
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

vfio: fix sPAPR IOMMU DMA window size

Browse Source 
DMA window size needs to be big enough to span all memory segment's
physical addresses. We do not need multiple levels of IOMMU tables
as we already span ~70TB of physical memory with 16MB hugepages.

Signed-off-by: Jonas Pfefferle <jpf@zurich.ibm.com>
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
This commit is contained in:
Jonas Pfefferle 2017-08-08 13:16:42 +02:00 committed by Thomas Monjalon
parent 1459585888
commit ed1e7e576b
1 changed files with 17 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
lib/librte_eal/linuxapp/eal/eal_vfio.c
View File

@ -762,10 +762,19 @@ vfio_spapr_dma_map(int vfio_container_fd)
return -1;
}
/* calculate window size based on number of hugepages configured */
create.window_size = rte_eal_get_physmem_size();
/* create DMA window from 0 to max(phys_addr + len) */
for (i = 0; i < RTE_MAX_MEMSEG; i++) {
if (ms[i].addr == NULL)
break;
create.window_size = RTE_MAX(create.window_size,
ms[i].phys_addr + ms[i].len);
}
/* sPAPR requires window size to be a power of 2 */
create.window_size = rte_align64pow2(create.window_size);
create.page_shift = __builtin_ctzll(ms->hugepage_sz);
create.levels = 2;
create.levels = 1;
ret = ioctl(vfio_container_fd, VFIO_IOMMU_SPAPR_TCE_CREATE, &create);
if (ret) {
@ -774,6 +783,11 @@ vfio_spapr_dma_map(int vfio_container_fd)
return -1;
}
if (create.start_addr != 0) {
RTE_LOG(ERR, EAL, " DMA window start address != 0\n");
return -1;
}
/* map all DPDK segments for DMA. use 1:1 PA to IOVA mapping */
for (i = 0; i < RTE_MAX_MEMSEG; i++) {
struct vfio_iommu_type1_dma_map dma_map;