diff options
| author | Dave Jiang <dave.jiang@intel.com> | 2021-04-20 11:46:28 -0700 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2021-04-23 23:08:44 +0530 |
| commit | 8c66bbdc4fbf3c297ebc8edf71f359e4a132c9db (patch) | |
| tree | 9fadc8cc3e90063bbe92611152bae3001ace2216 /drivers/dma/idxd/sysfs.c | |
| parent | 93a40a6d7428921897bb7fed5ffb4ce83df05432 (diff) | |
| download | linux-8c66bbdc4fbf3c297ebc8edf71f359e4a132c9db.tar.bz2 | |
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/sysfs.c')
| -rw-r--r-- | drivers/dma/idxd/sysfs.c | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c index dad5c0be9ae8..d45cb61f300b 100644 --- a/drivers/dma/idxd/sysfs.c +++ b/drivers/dma/idxd/sysfs.c @@ -110,7 +110,8 @@ static int enable_wq(struct idxd_wq *wq) } spin_lock_irqsave(&idxd->dev_lock, flags); - rc = idxd_device_config(idxd); + if (test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags)) + rc = idxd_device_config(idxd); spin_unlock_irqrestore(&idxd->dev_lock, flags); if (rc < 0) { mutex_unlock(&wq->wq_lock); @@ -170,7 +171,7 @@ static int enable_wq(struct idxd_wq *wq) static int idxd_config_bus_probe(struct device *dev) { - int rc; + int rc = 0; unsigned long flags; dev_dbg(dev, "%s called\n", __func__); @@ -188,7 +189,8 @@ static int idxd_config_bus_probe(struct device *dev) /* Perform IDXD configuration and enabling */ spin_lock_irqsave(&idxd->dev_lock, flags); - rc = idxd_device_config(idxd); + if (test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags)) + rc = idxd_device_config(idxd); spin_unlock_irqrestore(&idxd->dev_lock, flags); if (rc < 0) { module_put(THIS_MODULE); @@ -287,12 +289,14 @@ static int idxd_config_bus_remove(struct device *dev) idxd_unregister_dma_device(idxd); rc = idxd_device_disable(idxd); - for (i = 0; i < idxd->max_wqs; i++) { - struct idxd_wq *wq = idxd->wqs[i]; - - mutex_lock(&wq->wq_lock); - idxd_wq_disable_cleanup(wq); - mutex_unlock(&wq->wq_lock); + if (test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags)) { + for (i = 0; i < idxd->max_wqs; i++) { + struct idxd_wq *wq = idxd->wqs[i]; + + mutex_lock(&wq->wq_lock); + idxd_wq_disable_cleanup(wq); + mutex_unlock(&wq->wq_lock); + } } module_put(THIS_MODULE); if (rc < 0) |