diff options
| author |   Tadeusz Struk <tadeusz.struk@intel.com> | 2016-09-25 07:44:23 -0700 |
|---|---|---|
| committer |   Doug Ledford <dledford@redhat.com> | 2016-10-02 08:42:17 -0400 |
| commit | 0cb2aa690c7ef14ad1f544288349abb5434bb75d (patch) | |
| tree | d62ef577d193187d80650315d160fc37d896ecbb /drivers/infiniband/hw/hfi1/user_sdma.c | |
| parent | IB/hfi1: Fix resource release in context allocation (diff) | |
| download | linux-dev-0cb2aa690c7ef14ad1f544288349abb5434bb75d.tar.xz linux-dev-0cb2aa690c7ef14ad1f544288349abb5434bb75d.zip | |
IB/hfi1: Add sysfs interface for affinity setup
Some users want more control over which cpu cores are being used by the
driver. For example, users might want to restrict the driver to some
specified subset of the cores so that they can appropriately partition
processes, irq handlers, and work threads.
To allow the user to fine tune system affinity settings new sysfs
attributes are introduced per sdma engine. This patch adds a new
attribute type for sdma engine and a new cpu_list attribute.
When the user writes a cpu range to the cpu_list attribute the driver
will create an internal cpu->sdma map, which will be used later as a
look-up table to choose an optimal engine for a user requests.
Reviewed-by: Dean Luick <dean.luick@intel.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Sebastian Sanchez <sebastian.sanchez@intel.com>
Reviewed-by: Jianxin Xiong <jianxin.xiong@intel.com>
Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/user_sdma.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/drivers/infiniband/hw/hfi1/user_sdma.c b/drivers/infiniband/hw/hfi1/user_sdma.c index bc7e5c179f80..a761f804111e 100644 --- a/drivers/infiniband/hw/hfi1/user_sdma.c +++ b/drivers/infiniband/hw/hfi1/user_sdma.c @@ -548,7 +548,7 @@ int hfi1_user_sdma_process_request(struct file *fp, struct iovec *iovec, u8 opcode, sc, vl; int req_queued = 0; u16 dlid; - u8 selector; + u32 selector; if (iovec[idx].iov_len < sizeof(info) + sizeof(req->hdr)) { hfi1_cdbg( @@ -753,12 +753,9 @@ int hfi1_user_sdma_process_request(struct file *fp, struct iovec *iovec, dlid = be16_to_cpu(req->hdr.lrh[1]); selector = dlid_to_selector(dlid); + selector += uctxt->ctxt + fd->subctxt; + req->sde = sdma_select_user_engine(dd, selector, vl); - /* Have to select the engine */ - req->sde = sdma_select_engine_vl(dd, - (u32)(uctxt->ctxt + fd->subctxt + - selector), - vl); if (!req->sde || !sdma_running(req->sde)) { ret = -ECOMM; goto free_req; |