| Message ID | 20230428205539.113902-2-tom.zanussi@linux.intel.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | crypto: Add Intel Analytics Accelerator (IAA) crypto compression driver | expand |
Hi, Tom, On 4/28/23 13:55, Tom Zanussi wrote: > From: Dave Jiang <dave.jiang@intel.com> > > With the possibility of multiple wq drivers that can be bound to the wq, > the user config tool accel-config needs a way to know which wq driver to > bind to the wq. Introduce per wq driver_name sysfs attribute where the user > can indicate the driver to be bound to the wq. This allows accel-config to > just bind to the driver using wq->driver_name. > > Signed-off-by: Dave Jiang <dave.jiang@intel.com> > Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> > --- ... > diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h > index 7ced8d283d98..505118fc19de 100644 > --- a/drivers/dma/idxd/idxd.h > +++ b/drivers/dma/idxd/idxd.h > @@ -214,6 +214,8 @@ struct idxd_wq { > char name[WQ_NAME_SIZE + 1]; > u64 max_xfer_bytes; > u32 max_batch_size; > + > + char driver_name[WQ_NAME_SIZE + 1]; It's confused to use "WQ_NAME_SIZE" for driver name size. Maybe it's better to have a new definition "DRIVER_NAME_SIZE"? BTW, WQ_NAME_SIZE is 1024 which is unnecessary big for storing driver_name[] in the structure. It would be better to have a smaller size (e.g. 128) in DRIVER_NAME_SIZE. Thanks. -Fenghua
Hi Fenghua, On Fri, 2023-04-28 at 17:14 -0700, Fenghua Yu wrote: > Hi, Tom, > > On 4/28/23 13:55, Tom Zanussi wrote: > > From: Dave Jiang <dave.jiang@intel.com> > > > > With the possibility of multiple wq drivers that can be bound to > > the wq, > > the user config tool accel-config needs a way to know which wq > > driver to > > bind to the wq. Introduce per wq driver_name sysfs attribute where > > the user > > can indicate the driver to be bound to the wq. This allows accel- > > config to > > just bind to the driver using wq->driver_name. > > > > Signed-off-by: Dave Jiang <dave.jiang@intel.com> > > Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> > > --- > > ... > > > diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h > > index 7ced8d283d98..505118fc19de 100644 > > --- a/drivers/dma/idxd/idxd.h > > +++ b/drivers/dma/idxd/idxd.h > > @@ -214,6 +214,8 @@ struct idxd_wq { > > char name[WQ_NAME_SIZE + 1]; > > u64 max_xfer_bytes; > > u32 max_batch_size; > > + > > + char driver_name[WQ_NAME_SIZE + 1]; > > It's confused to use "WQ_NAME_SIZE" for driver name size. > Maybe it's better to have a new definition "DRIVER_NAME_SIZE"? > BTW, WQ_NAME_SIZE is 1024 which is unnecessary big for storing > driver_name[] in the structure. It would be better to have a smaller > size (e.g. 128) in DRIVER_NAME_SIZE. Yes, that makes sense - I'll add an IAA_DRIVER_NAME_SIZE of 128 and use that instead. Thanks, Tom > > Thanks. > > -Fenghua
diff --git a/Documentation/ABI/stable/sysfs-driver-dma-idxd b/Documentation/ABI/stable/sysfs-driver-dma-idxd index 3becc9a82bdf..d5daae442fe7 100644 --- a/Documentation/ABI/stable/sysfs-driver-dma-idxd +++ b/Documentation/ABI/stable/sysfs-driver-dma-idxd @@ -244,6 +244,12 @@ Description: Shows the operation capability bits displayed in bitmap format correlates to the operations allowed. It's visible only on platforms that support the capability. +What: /sys/bus/dsa/devices/wq<m>.<n>/driver_name +Date: Mar 27, 2023 +KernelVersion: 6.4.0 +Contact: dmaengine@vger.kernel.org +Description: Name of driver to be bounded to the wq. + What: /sys/bus/dsa/devices/engine<m>.<n>/group_id Date: Oct 25, 2019 KernelVersion: 5.6.0 diff --git a/drivers/dma/idxd/cdev.c b/drivers/dma/idxd/cdev.c index 674bfefca088..f3d1604e753d 100644 --- a/drivers/dma/idxd/cdev.c +++ b/drivers/dma/idxd/cdev.c @@ -304,6 +304,7 @@ void idxd_wq_del_cdev(struct idxd_wq *wq) static int idxd_user_drv_probe(struct idxd_dev *idxd_dev) { + struct device *dev = &idxd_dev->conf_dev; struct idxd_wq *wq = idxd_dev_to_wq(idxd_dev); struct idxd_device *idxd = wq->idxd; int rc; @@ -330,6 +331,13 @@ static int idxd_user_drv_probe(struct idxd_dev *idxd_dev) } mutex_lock(&wq->wq_lock); + + if (!idxd_wq_driver_name_match(wq, dev)) { + idxd->cmd_status = IDXD_SCMD_WQ_NO_DRV_NAME; + rc = -ENODEV; + goto err; + } + wq->type = IDXD_WQT_USER; rc = drv_enable_wq(wq); if (rc < 0) diff --git a/drivers/dma/idxd/dma.c b/drivers/dma/idxd/dma.c index eb35ca313684..8bb7e7ff8d6a 100644 --- a/drivers/dma/idxd/dma.c +++ b/drivers/dma/idxd/dma.c @@ -305,6 +305,12 @@ static int idxd_dmaengine_drv_probe(struct idxd_dev *idxd_dev) return -ENXIO; mutex_lock(&wq->wq_lock); + if (!idxd_wq_driver_name_match(wq, dev)) { + idxd->cmd_status = IDXD_SCMD_WQ_NO_DRV_NAME; + rc = -ENODEV; + goto err; + } + wq->type = IDXD_WQT_KERNEL; rc = drv_enable_wq(wq); diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h index 7ced8d283d98..505118fc19de 100644 --- a/drivers/dma/idxd/idxd.h +++ b/drivers/dma/idxd/idxd.h @@ -214,6 +214,8 @@ struct idxd_wq { char name[WQ_NAME_SIZE + 1]; u64 max_xfer_bytes; u32 max_batch_size; + + char driver_name[WQ_NAME_SIZE + 1]; }; struct idxd_engine { @@ -580,6 +582,11 @@ static inline void idxd_wqcfg_set_max_batch_shift(int idxd_type, union wqcfg *wq wqcfg->max_batch_shift = max_batch_shift; } +static inline int idxd_wq_driver_name_match(struct idxd_wq *wq, struct device *dev) +{ + return (strncmp(wq->driver_name, dev->driver->name, strlen(dev->driver->name)) == 0); +} + int __must_check __idxd_driver_register(struct idxd_device_driver *idxd_drv, struct module *module, const char *mod_name); #define idxd_driver_register(driver) \ diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c index 18cd8151dee0..cb5864c98d5a 100644 --- a/drivers/dma/idxd/sysfs.c +++ b/drivers/dma/idxd/sysfs.c @@ -1224,6 +1224,33 @@ static ssize_t wq_op_config_store(struct device *dev, struct device_attribute *a static struct device_attribute dev_attr_wq_op_config = __ATTR(op_config, 0644, wq_op_config_show, wq_op_config_store); +static ssize_t wq_driver_name_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct idxd_wq *wq = confdev_to_wq(dev); + + return sysfs_emit(buf, "%s\n", wq->driver_name); +} + +static ssize_t wq_driver_name_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct idxd_wq *wq = confdev_to_wq(dev); + + if (wq->state != IDXD_WQ_DISABLED) + return -EPERM; + + if (strlen(buf) > WQ_NAME_SIZE || strlen(buf) == 0) + return -EINVAL; + + memset(wq->driver_name, 0, WQ_NAME_SIZE + 1); + strncpy(wq->driver_name, buf, WQ_NAME_SIZE); + strreplace(wq->name, '\n', '\0'); + return count; +} + +static struct device_attribute dev_attr_wq_driver_name = + __ATTR(driver_name, 0644, wq_driver_name_show, wq_driver_name_store); + static struct attribute *idxd_wq_attributes[] = { &dev_attr_wq_clients.attr, &dev_attr_wq_state.attr, @@ -1242,6 +1269,7 @@ static struct attribute *idxd_wq_attributes[] = { &dev_attr_wq_occupancy.attr, &dev_attr_wq_enqcmds_retries.attr, &dev_attr_wq_op_config.attr, + &dev_attr_wq_driver_name.attr, NULL, }; diff --git a/include/uapi/linux/idxd.h b/include/uapi/linux/idxd.h index 1d553bedbdb5..2f85c8f59eb5 100644 --- a/include/uapi/linux/idxd.h +++ b/include/uapi/linux/idxd.h @@ -30,6 +30,7 @@ enum idxd_scmd_stat { IDXD_SCMD_WQ_NO_PRIV = 0x800f0000, IDXD_SCMD_WQ_IRQ_ERR = 0x80100000, IDXD_SCMD_WQ_USER_NO_IOMMU = 0x80110000, + IDXD_SCMD_WQ_NO_DRV_NAME = 0x80200000, }; #define IDXD_SCMD_SOFTERR_MASK 0x80000000