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path: root/drivers/misc/mei/client.c
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Diffstat (limited to 'drivers/misc/mei/client.c')
-rw-r--r--drivers/misc/mei/client.c291
1 files changed, 289 insertions, 2 deletions
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index a56d41321f32..4378a9b25848 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -9,6 +9,7 @@
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
+#include <linux/dma-mapping.h>
#include <linux/mei.h>
@@ -990,7 +991,8 @@ int mei_cl_disconnect(struct mei_cl *cl)
return 0;
}
- if (dev->dev_state == MEI_DEV_POWER_DOWN) {
+ if (dev->dev_state == MEI_DEV_POWERING_DOWN ||
+ dev->dev_state == MEI_DEV_POWER_DOWN) {
cl_dbg(dev, cl, "Device is powering down, don't bother with disconnection\n");
mei_cl_set_disconnected(cl);
return 0;
@@ -1737,7 +1739,7 @@ static inline u8 mei_ext_hdr_set_vtag(struct mei_ext_hdr *ext, u8 vtag)
*
* @cb: message callback structure
*
- * Return: a pointer to initialized header
+ * Return: a pointer to initialized header or ERR_PTR on failure
*/
static struct mei_msg_hdr *mei_msg_hdr_init(const struct mei_cl_cb *cb)
{
@@ -2113,6 +2115,8 @@ void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb)
case MEI_FOP_DISCONNECT:
case MEI_FOP_NOTIFY_STOP:
case MEI_FOP_NOTIFY_START:
+ case MEI_FOP_DMA_MAP:
+ case MEI_FOP_DMA_UNMAP:
if (waitqueue_active(&cl->wait))
wake_up(&cl->wait);
@@ -2139,3 +2143,286 @@ void mei_cl_all_disconnect(struct mei_device *dev)
list_for_each_entry(cl, &dev->file_list, link)
mei_cl_set_disconnected(cl);
}
+
+static struct mei_cl *mei_cl_dma_map_find(struct mei_device *dev, u8 buffer_id)
+{
+ struct mei_cl *cl;
+
+ list_for_each_entry(cl, &dev->file_list, link)
+ if (cl->dma.buffer_id == buffer_id)
+ return cl;
+ return NULL;
+}
+
+/**
+ * mei_cl_irq_dma_map - send client dma map request in irq_thread context
+ *
+ * @cl: client
+ * @cb: callback block.
+ * @cmpl_list: complete list.
+ *
+ * Return: 0 on such and error otherwise.
+ */
+int mei_cl_irq_dma_map(struct mei_cl *cl, struct mei_cl_cb *cb,
+ struct list_head *cmpl_list)
+{
+ struct mei_device *dev = cl->dev;
+ u32 msg_slots;
+ int slots;
+ int ret;
+
+ msg_slots = mei_hbm2slots(sizeof(struct hbm_client_dma_map_request));
+ slots = mei_hbuf_empty_slots(dev);
+ if (slots < 0)
+ return -EOVERFLOW;
+
+ if ((u32)slots < msg_slots)
+ return -EMSGSIZE;
+
+ ret = mei_hbm_cl_dma_map_req(dev, cl);
+ if (ret) {
+ cl->status = ret;
+ list_move_tail(&cb->list, cmpl_list);
+ return ret;
+ }
+
+ list_move_tail(&cb->list, &dev->ctrl_rd_list);
+ return 0;
+}
+
+/**
+ * mei_cl_irq_dma_unmap - send client dma unmap request in irq_thread context
+ *
+ * @cl: client
+ * @cb: callback block.
+ * @cmpl_list: complete list.
+ *
+ * Return: 0 on such and error otherwise.
+ */
+int mei_cl_irq_dma_unmap(struct mei_cl *cl, struct mei_cl_cb *cb,
+ struct list_head *cmpl_list)
+{
+ struct mei_device *dev = cl->dev;
+ u32 msg_slots;
+ int slots;
+ int ret;
+
+ msg_slots = mei_hbm2slots(sizeof(struct hbm_client_dma_unmap_request));
+ slots = mei_hbuf_empty_slots(dev);
+ if (slots < 0)
+ return -EOVERFLOW;
+
+ if ((u32)slots < msg_slots)
+ return -EMSGSIZE;
+
+ ret = mei_hbm_cl_dma_unmap_req(dev, cl);
+ if (ret) {
+ cl->status = ret;
+ list_move_tail(&cb->list, cmpl_list);
+ return ret;
+ }
+
+ list_move_tail(&cb->list, &dev->ctrl_rd_list);
+ return 0;
+}
+
+static int mei_cl_dma_alloc(struct mei_cl *cl, u8 buf_id, size_t size)
+{
+ cl->dma.vaddr = dmam_alloc_coherent(cl->dev->dev, size,
+ &cl->dma.daddr, GFP_KERNEL);
+ if (!cl->dma.vaddr)
+ return -ENOMEM;
+
+ cl->dma.buffer_id = buf_id;
+ cl->dma.size = size;
+
+ return 0;
+}
+
+static void mei_cl_dma_free(struct mei_cl *cl)
+{
+ cl->dma.buffer_id = 0;
+ dmam_free_coherent(cl->dev->dev,
+ cl->dma.size, cl->dma.vaddr, cl->dma.daddr);
+ cl->dma.size = 0;
+ cl->dma.vaddr = NULL;
+ cl->dma.daddr = 0;
+}
+
+/**
+ * mei_cl_alloc_and_map - send client dma map request
+ *
+ * @cl: host client
+ * @fp: pointer to file structure
+ * @buffer_id: id of the mapped buffer
+ * @size: size of the buffer
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * Return:
+ * * -ENODEV
+ * * -EINVAL
+ * * -EOPNOTSUPP
+ * * -EPROTO
+ * * -ENOMEM;
+ */
+int mei_cl_dma_alloc_and_map(struct mei_cl *cl, const struct file *fp,
+ u8 buffer_id, size_t size)
+{
+ struct mei_device *dev;
+ struct mei_cl_cb *cb;
+ int rets;
+
+ if (WARN_ON(!cl || !cl->dev))
+ return -ENODEV;
+
+ dev = cl->dev;
+
+ if (!dev->hbm_f_cd_supported) {
+ cl_dbg(dev, cl, "client dma is not supported\n");
+ return -EOPNOTSUPP;
+ }
+
+ if (buffer_id == 0)
+ return -EINVAL;
+
+ if (!mei_cl_is_connected(cl))
+ return -ENODEV;
+
+ if (cl->dma_mapped)
+ return -EPROTO;
+
+ if (mei_cl_dma_map_find(dev, buffer_id)) {
+ cl_dbg(dev, cl, "client dma with id %d is already allocated\n",
+ cl->dma.buffer_id);
+ return -EPROTO;
+ }
+
+ rets = pm_runtime_get(dev->dev);
+ if (rets < 0 && rets != -EINPROGRESS) {
+ pm_runtime_put_noidle(dev->dev);
+ cl_err(dev, cl, "rpm: get failed %d\n", rets);
+ return rets;
+ }
+
+ rets = mei_cl_dma_alloc(cl, buffer_id, size);
+ if (rets) {
+ pm_runtime_put_noidle(dev->dev);
+ return rets;
+ }
+
+ cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_DMA_MAP, fp);
+ if (!cb) {
+ rets = -ENOMEM;
+ goto out;
+ }
+
+ if (mei_hbuf_acquire(dev)) {
+ if (mei_hbm_cl_dma_map_req(dev, cl)) {
+ rets = -ENODEV;
+ goto out;
+ }
+ list_move_tail(&cb->list, &dev->ctrl_rd_list);
+ }
+
+ mutex_unlock(&dev->device_lock);
+ wait_event_timeout(cl->wait,
+ cl->dma_mapped ||
+ cl->status ||
+ !mei_cl_is_connected(cl),
+ mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
+ mutex_lock(&dev->device_lock);
+
+ if (!cl->dma_mapped && !cl->status)
+ cl->status = -EFAULT;
+
+ rets = cl->status;
+
+out:
+ if (rets)
+ mei_cl_dma_free(cl);
+
+ cl_dbg(dev, cl, "rpm: autosuspend\n");
+ pm_runtime_mark_last_busy(dev->dev);
+ pm_runtime_put_autosuspend(dev->dev);
+
+ mei_io_cb_free(cb);
+ return rets;
+}
+
+/**
+ * mei_cl_unmap_and_free - send client dma unmap request
+ *
+ * @cl: host client
+ * @fp: pointer to file structure
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * Return: 0 on such and error otherwise.
+ */
+int mei_cl_dma_unmap(struct mei_cl *cl, const struct file *fp)
+{
+ struct mei_device *dev;
+ struct mei_cl_cb *cb;
+ int rets;
+
+ if (WARN_ON(!cl || !cl->dev))
+ return -ENODEV;
+
+ dev = cl->dev;
+
+ if (!dev->hbm_f_cd_supported) {
+ cl_dbg(dev, cl, "client dma is not supported\n");
+ return -EOPNOTSUPP;
+ }
+
+ if (!mei_cl_is_connected(cl))
+ return -ENODEV;
+
+ if (!cl->dma_mapped)
+ return -EPROTO;
+
+ rets = pm_runtime_get(dev->dev);
+ if (rets < 0 && rets != -EINPROGRESS) {
+ pm_runtime_put_noidle(dev->dev);
+ cl_err(dev, cl, "rpm: get failed %d\n", rets);
+ return rets;
+ }
+
+ cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_DMA_UNMAP, fp);
+ if (!cb) {
+ rets = -ENOMEM;
+ goto out;
+ }
+
+ if (mei_hbuf_acquire(dev)) {
+ if (mei_hbm_cl_dma_unmap_req(dev, cl)) {
+ rets = -ENODEV;
+ goto out;
+ }
+ list_move_tail(&cb->list, &dev->ctrl_rd_list);
+ }
+
+ mutex_unlock(&dev->device_lock);
+ wait_event_timeout(cl->wait,
+ !cl->dma_mapped ||
+ cl->status ||
+ !mei_cl_is_connected(cl),
+ mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
+ mutex_lock(&dev->device_lock);
+
+ if (cl->dma_mapped && !cl->status)
+ cl->status = -EFAULT;
+
+ rets = cl->status;
+
+ if (!rets)
+ mei_cl_dma_free(cl);
+out:
+ cl_dbg(dev, cl, "rpm: autosuspend\n");
+ pm_runtime_mark_last_busy(dev->dev);
+ pm_runtime_put_autosuspend(dev->dev);
+
+ mei_io_cb_free(cb);
+ return rets;
+}
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