lkml.org 
[lkml]   [2021]   [Feb]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[char-misc-next 6/6] mei: bus: add client dma interface
Date
From: Alexander Usyskin <alexander.usyskin@intel.com>

Expose the client dma mapping via mei client
bus interface.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
drivers/misc/mei/bus.c | 46 ++++++++++++++++++++++++++++++++++++++
drivers/misc/mei/hw.h | 5 +++++
include/linux/mei_cl_bus.h | 3 +++
3 files changed, 54 insertions(+)

diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index 34fb5e541fe5..d430710a5fe5 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -636,6 +636,52 @@ static void mei_cl_bus_vtag_free(struct mei_cl_device *cldev)
kfree(cl_vtag);
}

+void *mei_cldev_dma_map(struct mei_cl_device *cldev, u8 buffer_id, size_t size)
+{
+ struct mei_device *bus;
+ struct mei_cl *cl;
+ int ret;
+
+ if (!cldev || !buffer_id || !size)
+ return ERR_PTR(-EINVAL);
+
+ if (!IS_ALIGNED(size, MEI_FW_PAGE_SIZE)) {
+ dev_err(&cldev->dev, "Map size should be aligned to %lu\n",
+ MEI_FW_PAGE_SIZE);
+ return ERR_PTR(-EINVAL);
+ }
+
+ cl = cldev->cl;
+ bus = cldev->bus;
+
+ mutex_lock(&bus->device_lock);
+ ret = mei_cl_dma_alloc_and_map(cl, NULL, buffer_id, size);
+ mutex_unlock(&bus->device_lock);
+ if (ret)
+ return ERR_PTR(ret);
+ return cl->dma.vaddr;
+}
+EXPORT_SYMBOL_GPL(mei_cldev_dma_map);
+
+int mei_cldev_dma_unmap(struct mei_cl_device *cldev)
+{
+ struct mei_device *bus;
+ struct mei_cl *cl;
+ int ret;
+
+ if (!cldev)
+ return -EINVAL;
+
+ cl = cldev->cl;
+ bus = cldev->bus;
+
+ mutex_lock(&bus->device_lock);
+ ret = mei_cl_dma_unmap(cl, NULL);
+ mutex_unlock(&bus->device_lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(mei_cldev_dma_unmap);
+
/**
* mei_cldev_enable - enable me client device
* create connection with me client
diff --git a/drivers/misc/mei/hw.h b/drivers/misc/mei/hw.h
index b10606550613..bc240b88abf1 100644
--- a/drivers/misc/mei/hw.h
+++ b/drivers/misc/mei/hw.h
@@ -22,6 +22,11 @@
#define MEI_D0I3_TIMEOUT 5 /* D0i3 set/unset max response time */
#define MEI_HBM_TIMEOUT 1 /* 1 second */

+/*
+ * FW page size for DMA allocations
+ */
+#define MEI_FW_PAGE_SIZE 4096UL
+
/*
* MEI Version
*/
diff --git a/include/linux/mei_cl_bus.h b/include/linux/mei_cl_bus.h
index 959ad7d850b4..53801eacfaef 100644
--- a/include/linux/mei_cl_bus.h
+++ b/include/linux/mei_cl_bus.h
@@ -116,4 +116,7 @@ int mei_cldev_enable(struct mei_cl_device *cldev);
int mei_cldev_disable(struct mei_cl_device *cldev);
bool mei_cldev_enabled(struct mei_cl_device *cldev);

+void *mei_cldev_dma_map(struct mei_cl_device *cldev, u8 buffer_id, size_t size);
+int mei_cldev_dma_unmap(struct mei_cl_device *cldev);
+
#endif /* _LINUX_MEI_CL_BUS_H */
--
2.26.2
\
 
 \ /
  Last update: 2021-02-06 15:47    [W:0.078 / U:2.944 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site