diff options
| author | Jon Mason <jon.mason@intel.com> | 2013-02-12 20:52:50 +0400 |
|---|---|---|
| committer | Jon Mason <jon.mason@intel.com> | 2013-09-05 22:04:09 +0400 |
| commit | 282a2feeb9bfb1d1dfbad93df206b74eaf80d564 (patch) | |
| tree | 9265a6308dd746606dbcb0bac330082f97780be9 /drivers/ntb/ntb_hw.c | |
| parent | ac477afb0431386575ef453f50fa0052c3f0461b (diff) | |
| download | linux-282a2feeb9bfb1d1dfbad93df206b74eaf80d564.tar.xz | |
NTB: Use DMA Engine to Transmit and Receive
Allocate and use a DMA engine channel to transmit and receive data over
NTB. If none is allocated, fall back to using the CPU to transfer data.
Signed-off-by: Jon Mason <jon.mason@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Diffstat (limited to 'drivers/ntb/ntb_hw.c')
| -rw-r--r-- | drivers/ntb/ntb_hw.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c index ab34795cf125..0345817a8355 100644 --- a/drivers/ntb/ntb_hw.c +++ b/drivers/ntb/ntb_hw.c @@ -350,6 +350,23 @@ int ntb_read_remote_spad(struct ntb_device *ndev, unsigned int idx, u32 *val) } /** + * ntb_get_mw_base() - get addr for the NTB memory window + * @ndev: pointer to ntb_device instance + * @mw: memory window number + * + * This function provides the base address of the memory window specified. + * + * RETURNS: address, or NULL on error. + */ +resource_size_t ntb_get_mw_base(struct ntb_device *ndev, unsigned int mw) +{ + if (mw >= ntb_max_mw(ndev)) + return 0; + + return pci_resource_start(ndev->pdev, MW_TO_BAR(mw)); +} + +/** * ntb_get_mw_vbase() - get virtual addr for the NTB memory window * @ndev: pointer to ntb_device instance * @mw: memory window number |