diff options
| author | Michael Kelley <mikelley@microsoft.com> | 2021-02-23 14:44:54 -0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-03-17 00:04:40 -0400 |
| commit | 3d9c3dcc58e968403f29767726407bc680e087b5 (patch) | |
| tree | 5fb4eeaecd3eeb00281c0037eb07bfbbcef805ec /include/linux/hyperv.h | |
| parent | 471ee95ccca9c417344453f73a39681cfde39af1 (diff) | |
scsi: storvsc: Enable scatterlist entry lengths > 4Kbytes
storvsc currently sets .dma_boundary to limit scatterlist entries to 4
Kbytes, which is less efficient with huge pages that offer large chunks of
contiguous physical memory. Improve the algorithm for creating the Hyper-V
guest physical address PFN array so that scatterlist entries with lengths >
4Kbytes are handled. As a result, remove the .dma_boundary setting.
The improved algorithm also adds support for scatterlist entries with
offsets >= 4Kbytes, which is supported by many other SCSI low-level
drivers. And it retains support for architectures where possibly PAGE_SIZE
!= HV_HYP_PAGE_SIZE (such as ARM64).
Link: https://lore.kernel.org/r/1614120294-1930-1-git-send-email-mikelley@microsoft.com
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'include/linux/hyperv.h')
| -rw-r--r-- | include/linux/hyperv.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index f1d74dcf0353..7be8c5f7c5b2 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -1726,6 +1726,7 @@ static inline unsigned long virt_to_hvpfn(void *addr) #define NR_HV_HYP_PAGES_IN_PAGE (PAGE_SIZE / HV_HYP_PAGE_SIZE) #define offset_in_hvpage(ptr) ((unsigned long)(ptr) & ~HV_HYP_PAGE_MASK) #define HVPFN_UP(x) (((x) + HV_HYP_PAGE_SIZE-1) >> HV_HYP_PAGE_SHIFT) +#define HVPFN_DOWN(x) ((x) >> HV_HYP_PAGE_SHIFT) #define page_to_hvpfn(page) (page_to_pfn(page) * NR_HV_HYP_PAGES_IN_PAGE) #endif /* _HYPERV_H */ |