On 10/06/2022 16:37, John Garry via iommu wrote:
On 6/9/22 10:54, John Garry wrote:
ok, but do you have a system where the UFS host controller is behind
an IOMMU? I had the impression that UFS controllers would be mostly
found in embedded systems and IOMMUs are not as common on there.
On 09/06/2022 21:34, Bart Van Assche wrote:
On 6/9/22 10:54, John Garry wrote:
ok, but do you have a system where the UFS host controller is behind
an IOMMU? I had the impression that UFS controllers would be mostly
found in embedded systems and IOMMUs are not as common on there.
Modern
On 6/9/22 10:54, John Garry wrote:
ok, but do you have a system where the UFS host controller is behind an
IOMMU? I had the impression that UFS controllers would be mostly found
in embedded systems and IOMMUs are not as common on there.
Modern phones have an IOMMU. Below one can find an
On 09/06/2022 18:18, Bart Van Assche wrote:
SCSI host bus adapters that support 64-bit DMA may support much
larger transfer sizes than 128 KiB.
Indeed, and that is my problem today, as my storage controller is
generating DMA mapping lengths which exceeds 128K and they slow
everything down.
On 6/9/22 01:00, John Garry wrote:
On 08/06/2022 22:07, Bart Van Assche wrote:
On 6/8/22 10:50, John Garry wrote:
Please note that this limit only applies if we have an IOMMU enabled
for the scsi host dma device. Otherwise we are limited by dma direct
or swiotlb max mapping size, as before.
On 08/06/2022 22:07, Bart Van Assche wrote:
On 6/8/22 10:50, John Garry wrote:
Please note that this limit only applies if we have an IOMMU enabled
for the scsi host dma device. Otherwise we are limited by dma direct
or swiotlb max mapping size, as before.
SCSI host bus adapters that support
On 6/8/22 10:50, John Garry wrote:
Please note that this limit only applies if we have an IOMMU enabled for
the scsi host dma device. Otherwise we are limited by dma direct or
swiotlb max mapping size, as before.
SCSI host bus adapters that support 64-bit DMA may support much larger
transfer
On 08/06/2022 18:33, Bart Van Assche wrote:
On 6/6/22 02:30, John Garry wrote:
+ if (dma_dev->dma_mask) {
+ shost->max_sectors = min_t(unsigned int, shost->max_sectors,
+ dma_opt_mapping_size(dma_dev) >> SECTOR_SHIFT);
+ }
Since IOVA_RANGE_CACHE_MAX_SIZE = 6 this
On 6/6/22 02:30, John Garry wrote:
+ if (dma_dev->dma_mask) {
+ shost->max_sectors = min_t(unsigned int, shost->max_sectors,
+ dma_opt_mapping_size(dma_dev) >> SECTOR_SHIFT);
+ }
Since IOVA_RANGE_CACHE_MAX_SIZE = 6 this limits max_sectors
