diff options
| author | Dave Jiang <dave.jiang@intel.com> | 2019-02-22 10:00:05 -0700 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2019-02-25 12:18:38 +0530 |
| commit | e0100d40906d5dbe6d09d31083c1a5aaccc947fa (patch) | |
| tree | 5589211aa08cbc8d9c8987e3a8c5b1190c19fd32 /drivers/dma/ioat/init.c | |
| parent | 11e31e281bd8f482a9277268f7b0d9c213584271 (diff) | |
dmaengine: ioatdma: add descriptor pre-fetch support for v3.4
Adding support for new feature on ioatdma 3.4 hardware that provides
descriptor pre-fetching in order to reduce small DMA latencies.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/ioat/init.c')
| -rw-r--r-- | drivers/dma/ioat/init.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c index 58dd1bfd3edd..020bcdecb3fb 100644 --- a/drivers/dma/ioat/init.c +++ b/drivers/dma/ioat/init.c @@ -138,10 +138,10 @@ static int ioat3_dma_self_test(struct ioatdma_device *ioat_dma); static int ioat_dca_enabled = 1; module_param(ioat_dca_enabled, int, 0644); MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)"); -int ioat_pending_level = 4; +int ioat_pending_level = 7; module_param(ioat_pending_level, int, 0644); MODULE_PARM_DESC(ioat_pending_level, - "high-water mark for pushing ioat descriptors (default: 4)"); + "high-water mark for pushing ioat descriptors (default: 7)"); static char ioat_interrupt_style[32] = "msix"; module_param_string(ioat_interrupt_style, ioat_interrupt_style, sizeof(ioat_interrupt_style), 0644); @@ -1188,6 +1188,10 @@ static int ioat3_dma_probe(struct ioatdma_device *ioat_dma, int dca) if (err) return err; + if (ioat_dma->cap & IOAT_CAP_DPS) + writeb(ioat_pending_level + 1, + ioat_dma->reg_base + IOAT_PREFETCH_LIMIT_OFFSET); + return 0; } |