diff options
| author | Dave Jiang <dave.jiang@intel.com> | 2021-04-20 21:46:28 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2021-04-23 20:38:44 +0300 |
| commit | 8c66bbdc4fbf3c297ebc8edf71f359e4a132c9db (patch) | |
| tree | 9fadc8cc3e90063bbe92611152bae3001ace2216 /drivers/dma/idxd/init.c | |
| parent | 93a40a6d7428921897bb7fed5ffb4ce83df05432 (diff) | |
| download | linux-8c66bbdc4fbf3c297ebc8edf71f359e4a132c9db.tar.xz | |
dmaengine: idxd: add support for readonly config mode
The read-only configuration mode is defined by the DSA spec as a mode of
the device WQ configuration. When GENCAP register bit 31 is set to 0,
the device is in RO mode and group configuration and some fields of the
workqueue configuration registers are read-only and reflect the fixed
configuration of the device. Add support for RO mode. The driver will
load the values from the registers directly setup all the internally
cached data structures based on the device configuration.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/161894438847.3202472.6317563824045432727.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/idxd/init.c')
| -rw-r--r-- | drivers/dma/idxd/init.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c index eda5ffd307c6..a07e6d8eec00 100644 --- a/drivers/dma/idxd/init.c +++ b/drivers/dma/idxd/init.c @@ -482,6 +482,14 @@ static int idxd_probe(struct idxd_device *idxd) if (rc) goto err; + /* If the configs are readonly, then load them from device */ + if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags)) { + dev_dbg(dev, "Loading RO device config\n"); + rc = idxd_device_load_config(idxd); + if (rc < 0) + goto err; + } + rc = idxd_setup_interrupts(idxd); if (rc) goto err; |