GenWQE: Add sysfs interface for bitstream reload
This patch adds an interface on sysfs for userspace to request a card
bitstream reload. It sets the appropriate register and try to perform a
fundamental reset on the PCIe slot for the card to reload the bitstream
from the chosen partition.
Signed-off-by: Kleber Sacilotto de Souza <klebers@linux.vnet.ibm.com>
Acked-by: Frank Haverkamp <haver@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/genwqe/card_sysfs.c b/drivers/misc/genwqe/card_sysfs.c
index a72a992..7232e40 100644
--- a/drivers/misc/genwqe/card_sysfs.c
+++ b/drivers/misc/genwqe/card_sysfs.c
@@ -223,6 +223,30 @@
}
static DEVICE_ATTR_RW(next_bitstream);
+static ssize_t reload_bitstream_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int reload;
+ struct genwqe_dev *cd = dev_get_drvdata(dev);
+
+ if (kstrtoint(buf, 0, &reload) < 0)
+ return -EINVAL;
+
+ if (reload == 0x1) {
+ if (cd->card_state == GENWQE_CARD_UNUSED ||
+ cd->card_state == GENWQE_CARD_USED)
+ cd->card_state = GENWQE_CARD_RELOAD_BITSTREAM;
+ else
+ return -EIO;
+ } else {
+ return -EINVAL;
+ }
+
+ return count;
+}
+static DEVICE_ATTR_WO(reload_bitstream);
+
/*
* Create device_attribute structures / params: name, mode, show, store
* additional flag if valid in VF
@@ -239,6 +263,7 @@
&dev_attr_status.attr,
&dev_attr_freerunning_timer.attr,
&dev_attr_queue_working_time.attr,
+ &dev_attr_reload_bitstream.attr,
NULL,
};