From: Vitaly Lubart <vitaly.lubart@xxxxxxxxx>
The discrete graphics card with GSC firmware
using command streamer API hence it requires to enhance
pxp module with the new gsc_command() handler.
The handler is implemented via mei_pxp_gsc_command() which is
just a thin wrapper around mei_cldev_send_gsc_command()
Signed-off-by: Vitaly Lubart <vitaly.lubart@xxxxxxxxx>
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Alan Previn <alan.previn.teres.alexis@xxxxxxxxx>
---
V2:
1. More detailed commit message
2. Fix typo in the comments
V3: Rebase
V4:
1. Use forward declaration for struct scatterlist (Jani)
2. Drop double 'just' in the commit message
V5:
1. Drop usless input params checks in mei_pxp_gsc_command (Greg)
drivers/misc/mei/pxp/mei_pxp.c | 25 +++++++++++++++++++++++++
include/drm/i915_pxp_tee_interface.h | 5 +++++
2 files changed, 30 insertions(+)
diff --git a/drivers/misc/mei/pxp/mei_pxp.c b/drivers/misc/mei/pxp/mei_pxp.c
index 5c39457e3f53..f221464c4009 100644
--- a/drivers/misc/mei/pxp/mei_pxp.c
+++ b/drivers/misc/mei/pxp/mei_pxp.c
@@ -77,10 +77,35 @@ mei_pxp_receive_message(struct device *dev, void *buffer, size_t size)
return byte;
}
+/**
+ * mei_pxp_gsc_command() - sends a gsc command, by sending
+ * a sgl mei message to gsc and receiving reply from gsc
+ *
+ * @dev: device corresponding to the mei_cl_device
+ * @client_id: client id to send the command to
+ * @fence_id: fence id to send the command to
+ * @sg_in: scatter gather list containing addresses for rx message buffer
+ * @total_in_len: total length of data in 'in' sg, can be less than the sum of buffers sizes
+ * @sg_out: scatter gather list containing addresses for tx message buffer
+ *
+ * Return: bytes sent on Success, <0 on Failure
+ */
+static ssize_t mei_pxp_gsc_command(struct device *dev, u8 client_id, u32 fence_id,
+ struct scatterlist *sg_in, size_t total_in_len,
+ struct scatterlist *sg_out)
+{
+ struct mei_cl_device *cldev;
+
+ cldev = to_mei_cl_device(dev);
+
+ return mei_cldev_send_gsc_command(cldev, client_id, fence_id, sg_in, total_in_len, sg_out);
+}
+
static const struct i915_pxp_component_ops mei_pxp_ops = {
.owner = THIS_MODULE,
.send = mei_pxp_send_message,
.recv = mei_pxp_receive_message,
+ .gsc_command = mei_pxp_gsc_command,
};
static int mei_component_master_bind(struct device *dev)
diff --git a/include/drm/i915_pxp_tee_interface.h b/include/drm/i915_pxp_tee_interface.h
index af593ec64469..a702b6ec17f7 100644
--- a/include/drm/i915_pxp_tee_interface.h
+++ b/include/drm/i915_pxp_tee_interface.h
@@ -8,6 +8,7 @@
#include <linux/mutex.h>
#include <linux/device.h>
+struct scatterlist;
/**
* struct i915_pxp_component_ops - ops for PXP services.
@@ -23,6 +24,10 @@ struct i915_pxp_component_ops {
int (*send)(struct device *dev, const void *message, size_t size);
int (*recv)(struct device *dev, void *buffer, size_t size);
+ ssize_t (*gsc_command)(struct device *dev, u8 client_id, u32 fence_id,
+ struct scatterlist *sg_in, size_t total_in_len,
+ struct scatterlist *sg_out);
+
};
/**
--
2.37.2
