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path: root/drivers/misc/mei/interrupt.c
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Diffstat (limited to 'drivers/misc/mei/interrupt.c')
-rw-r--r--drivers/misc/mei/interrupt.c251
1 files changed, 199 insertions, 52 deletions
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index c70a8c74cc57..3f210413fd32 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -35,7 +35,7 @@ void mei_irq_compl_handler(struct mei_device *dev, struct list_head *cmpl_list)
cl = cb->cl;
list_del_init(&cb->list);
- dev_dbg(dev->dev, "completing call back.\n");
+ cl_dbg(dev, cl, "completing call back.\n");
mei_cl_complete(cl, cb);
}
}
@@ -61,17 +61,22 @@ static inline int mei_cl_hbm_equal(struct mei_cl *cl,
*
* @dev: mei device
* @hdr: message header
+ * @discard_len: the length of the message to discard (excluding header)
*/
-static void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr)
+static void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr,
+ size_t discard_len)
{
- if (hdr->dma_ring)
- mei_dma_ring_read(dev, NULL, hdr->extension[0]);
+ if (hdr->dma_ring) {
+ mei_dma_ring_read(dev, NULL,
+ hdr->extension[dev->rd_msg_hdr_count - 2]);
+ discard_len = 0;
+ }
/*
- * no need to check for size as it is guarantied
+ * no need to check for size as it is guaranteed
* that length fits into rd_msg_buf
*/
- mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
- dev_dbg(dev->dev, "discarding message " MEI_HDR_FMT "\n",
+ mei_read_slots(dev, dev->rd_msg_buf, discard_len);
+ dev_dbg(&dev->dev, "discarding message " MEI_HDR_FMT "\n",
MEI_HDR_PRM(hdr));
}
@@ -80,18 +85,32 @@ static void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr)
*
* @cl: reading client
* @mei_hdr: header of mei client message
+ * @meta: extend meta header
* @cmpl_list: completion list
*
* Return: always 0
*/
static int mei_cl_irq_read_msg(struct mei_cl *cl,
struct mei_msg_hdr *mei_hdr,
+ struct mei_ext_meta_hdr *meta,
struct list_head *cmpl_list)
{
struct mei_device *dev = cl->dev;
struct mei_cl_cb *cb;
+
+ struct mei_ext_hdr_vtag *vtag_hdr = NULL;
+ struct mei_ext_hdr_gsc_f2h *gsc_f2h = NULL;
+
size_t buf_sz;
u32 length;
+ u32 ext_len;
+
+ length = mei_hdr->length;
+ ext_len = 0;
+ if (mei_hdr->extended) {
+ ext_len = sizeof(*meta) + mei_slots2data(meta->size);
+ length -= ext_len;
+ }
cb = list_first_entry_or_null(&cl->rd_pending, struct mei_cl_cb, list);
if (!cb) {
@@ -105,13 +124,80 @@ static int mei_cl_irq_read_msg(struct mei_cl *cl,
list_add_tail(&cb->list, &cl->rd_pending);
}
+ if (mei_hdr->extended) {
+ struct mei_ext_hdr *ext = mei_ext_begin(meta);
+ do {
+ switch (ext->type) {
+ case MEI_EXT_HDR_VTAG:
+ vtag_hdr = (struct mei_ext_hdr_vtag *)ext;
+ break;
+ case MEI_EXT_HDR_GSC:
+ gsc_f2h = (struct mei_ext_hdr_gsc_f2h *)ext;
+ cb->ext_hdr = (struct mei_ext_hdr *)kzalloc(sizeof(*gsc_f2h), GFP_KERNEL);
+ if (!cb->ext_hdr) {
+ cb->status = -ENOMEM;
+ goto discard;
+ }
+ break;
+ case MEI_EXT_HDR_NONE:
+ fallthrough;
+ default:
+ cl_err(dev, cl, "unknown extended header\n");
+ cb->status = -EPROTO;
+ break;
+ }
+
+ ext = mei_ext_next(ext);
+ } while (!mei_ext_last(meta, ext));
+
+ if (!vtag_hdr && !gsc_f2h) {
+ cl_dbg(dev, cl, "no vtag or gsc found in extended header.\n");
+ cb->status = -EPROTO;
+ goto discard;
+ }
+ }
+
+ if (vtag_hdr) {
+ cl_dbg(dev, cl, "vtag: %d\n", vtag_hdr->vtag);
+ if (cb->vtag && cb->vtag != vtag_hdr->vtag) {
+ cl_err(dev, cl, "mismatched tag: %d != %d\n",
+ cb->vtag, vtag_hdr->vtag);
+ cb->status = -EPROTO;
+ goto discard;
+ }
+ cb->vtag = vtag_hdr->vtag;
+ }
+
+ if (gsc_f2h) {
+ u32 ext_hdr_len = mei_ext_hdr_len(&gsc_f2h->hdr);
+
+ if (!dev->hbm_f_gsc_supported) {
+ cl_err(dev, cl, "gsc extended header is not supported\n");
+ cb->status = -EPROTO;
+ goto discard;
+ }
+
+ if (length) {
+ cl_err(dev, cl, "no data allowed in cb with gsc\n");
+ cb->status = -EPROTO;
+ goto discard;
+ }
+ if (ext_hdr_len > sizeof(*gsc_f2h)) {
+ cl_err(dev, cl, "gsc extended header is too big %u\n", ext_hdr_len);
+ cb->status = -EPROTO;
+ goto discard;
+ }
+ memcpy(cb->ext_hdr, gsc_f2h, ext_hdr_len);
+ }
+
if (!mei_cl_is_connected(cl)) {
cl_dbg(dev, cl, "not connected\n");
cb->status = -ENODEV;
goto discard;
}
- length = mei_hdr->dma_ring ? mei_hdr->extension[0] : mei_hdr->length;
+ if (mei_hdr->dma_ring)
+ length = mei_hdr->extension[mei_data2slots(ext_len)];
buf_sz = length + cb->buf_idx;
/* catch for integer overflow */
@@ -129,11 +215,13 @@ static int mei_cl_irq_read_msg(struct mei_cl *cl,
goto discard;
}
- if (mei_hdr->dma_ring)
+ if (mei_hdr->dma_ring) {
mei_dma_ring_read(dev, cb->buf.data + cb->buf_idx, length);
-
- /* for DMA read 0 length to generate an interrupt to the device */
- mei_read_slots(dev, cb->buf.data + cb->buf_idx, mei_hdr->length);
+ /* for DMA read 0 length to generate interrupt to the device */
+ mei_read_slots(dev, cb->buf.data + cb->buf_idx, 0);
+ } else {
+ mei_read_slots(dev, cb->buf.data + cb->buf_idx, length);
+ }
cb->buf_idx += length;
@@ -141,8 +229,7 @@ static int mei_cl_irq_read_msg(struct mei_cl *cl,
cl_dbg(dev, cl, "completed read length = %zu\n", cb->buf_idx);
list_move_tail(&cb->list, cmpl_list);
} else {
- pm_runtime_mark_last_busy(dev->dev);
- pm_request_autosuspend(dev->dev);
+ pm_request_autosuspend(dev->parent);
}
return 0;
@@ -150,7 +237,7 @@ static int mei_cl_irq_read_msg(struct mei_cl *cl,
discard:
if (cb)
list_move_tail(&cb->list, cmpl_list);
- mei_irq_discard_msg(dev, mei_hdr);
+ mei_irq_discard_msg(dev, mei_hdr, length);
return 0;
}
@@ -222,6 +309,8 @@ static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
return ret;
}
+ pm_request_autosuspend(dev->parent);
+
list_move_tail(&cb->list, &cl->rd_pending);
return 0;
@@ -240,12 +329,17 @@ static inline bool hdr_is_fixed(struct mei_msg_hdr *mei_hdr)
static inline int hdr_is_valid(u32 msg_hdr)
{
struct mei_msg_hdr *mei_hdr;
+ u32 expected_len = 0;
mei_hdr = (struct mei_msg_hdr *)&msg_hdr;
if (!msg_hdr || mei_hdr->reserved)
return -EBADMSG;
- if (mei_hdr->dma_ring && mei_hdr->length != MEI_SLOT_SIZE)
+ if (mei_hdr->dma_ring)
+ expected_len += MEI_SLOT_SIZE;
+ if (mei_hdr->extended)
+ expected_len += MEI_SLOT_SIZE;
+ if (mei_hdr->length < expected_len)
return -EBADMSG;
return 0;
@@ -265,45 +359,92 @@ int mei_irq_read_handler(struct mei_device *dev,
struct list_head *cmpl_list, s32 *slots)
{
struct mei_msg_hdr *mei_hdr;
+ struct mei_ext_meta_hdr *meta_hdr = NULL;
struct mei_cl *cl;
int ret;
+ u32 hdr_size_left;
+ u32 hdr_size_ext;
+ int i;
+ int ext_hdr_end;
if (!dev->rd_msg_hdr[0]) {
dev->rd_msg_hdr[0] = mei_read_hdr(dev);
+ dev->rd_msg_hdr_count = 1;
(*slots)--;
- dev_dbg(dev->dev, "slots =%08x.\n", *slots);
+ dev_dbg(&dev->dev, "slots =%08x.\n", *slots);
ret = hdr_is_valid(dev->rd_msg_hdr[0]);
if (ret) {
- dev_err(dev->dev, "corrupted message header 0x%08X\n",
+ dev_err(&dev->dev, "corrupted message header 0x%08X\n",
dev->rd_msg_hdr[0]);
goto end;
}
}
mei_hdr = (struct mei_msg_hdr *)dev->rd_msg_hdr;
- dev_dbg(dev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
+ dev_dbg(&dev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
if (mei_slots2data(*slots) < mei_hdr->length) {
- dev_err(dev->dev, "less data available than length=%08x.\n",
+ dev_err(&dev->dev, "less data available than length=%08x.\n",
*slots);
/* we can't read the message */
ret = -ENODATA;
goto end;
}
+ ext_hdr_end = 1;
+ hdr_size_left = mei_hdr->length;
+
+ if (mei_hdr->extended) {
+ if (!dev->rd_msg_hdr[1]) {
+ dev->rd_msg_hdr[1] = mei_read_hdr(dev);
+ dev->rd_msg_hdr_count++;
+ (*slots)--;
+ dev_dbg(&dev->dev, "extended header is %08x\n", dev->rd_msg_hdr[1]);
+ }
+ meta_hdr = ((struct mei_ext_meta_hdr *)&dev->rd_msg_hdr[1]);
+ if (check_add_overflow((u32)sizeof(*meta_hdr),
+ mei_slots2data(meta_hdr->size),
+ &hdr_size_ext)) {
+ dev_err(&dev->dev, "extended message size too big %d\n",
+ meta_hdr->size);
+ return -EBADMSG;
+ }
+ if (hdr_size_left < hdr_size_ext) {
+ dev_err(&dev->dev, "corrupted message header len %d\n",
+ mei_hdr->length);
+ return -EBADMSG;
+ }
+ hdr_size_left -= hdr_size_ext;
+
+ ext_hdr_end = meta_hdr->size + 2;
+ for (i = dev->rd_msg_hdr_count; i < ext_hdr_end; i++) {
+ dev->rd_msg_hdr[i] = mei_read_hdr(dev);
+ dev_dbg(&dev->dev, "extended header %d is %08x\n", i,
+ dev->rd_msg_hdr[i]);
+ dev->rd_msg_hdr_count++;
+ (*slots)--;
+ }
+ }
+
if (mei_hdr->dma_ring) {
- dev->rd_msg_hdr[1] = mei_read_hdr(dev);
+ if (hdr_size_left != sizeof(dev->rd_msg_hdr[ext_hdr_end])) {
+ dev_err(&dev->dev, "corrupted message header len %d\n",
+ mei_hdr->length);
+ return -EBADMSG;
+ }
+
+ dev->rd_msg_hdr[ext_hdr_end] = mei_read_hdr(dev);
+ dev->rd_msg_hdr_count++;
(*slots)--;
- mei_hdr->length = 0;
+ mei_hdr->length -= sizeof(dev->rd_msg_hdr[ext_hdr_end]);
}
/* HBM message */
if (hdr_is_hbm(mei_hdr)) {
ret = mei_hbm_dispatch(dev, mei_hdr);
if (ret) {
- dev_dbg(dev->dev, "mei_hbm_dispatch failed ret = %d\n",
- ret);
+ dev_dbg(&dev->dev, "mei_hbm_dispatch failed ret = %d\n", ret);
goto end;
}
goto reset_slots;
@@ -313,39 +454,35 @@ int mei_irq_read_handler(struct mei_device *dev,
list_for_each_entry(cl, &dev->file_list, link) {
if (mei_cl_hbm_equal(cl, mei_hdr)) {
cl_dbg(dev, cl, "got a message\n");
- break;
+ ret = mei_cl_irq_read_msg(cl, mei_hdr, meta_hdr, cmpl_list);
+ goto reset_slots;
}
}
/* if no recipient cl was found we assume corrupted header */
- if (&cl->link == &dev->file_list) {
- /* A message for not connected fixed address clients
- * should be silently discarded
- * On power down client may be force cleaned,
- * silently discard such messages
- */
- if (hdr_is_fixed(mei_hdr) ||
- dev->dev_state == MEI_DEV_POWER_DOWN) {
- mei_irq_discard_msg(dev, mei_hdr);
- ret = 0;
- goto reset_slots;
- }
- dev_err(dev->dev, "no destination client found 0x%08X\n",
- dev->rd_msg_hdr[0]);
- ret = -EBADMSG;
- goto end;
+ /* A message for not connected fixed address clients
+ * should be silently discarded
+ * On power down client may be force cleaned,
+ * silently discard such messages
+ */
+ if (hdr_is_fixed(mei_hdr) ||
+ dev->dev_state == MEI_DEV_POWER_DOWN) {
+ mei_irq_discard_msg(dev, mei_hdr, mei_hdr->length);
+ ret = 0;
+ goto reset_slots;
}
-
- ret = mei_cl_irq_read_msg(cl, mei_hdr, cmpl_list);
-
+ dev_err(&dev->dev, "no destination client found 0x%08X\n", dev->rd_msg_hdr[0]);
+ ret = -EBADMSG;
+ goto end;
reset_slots:
/* reset the number of slots and header */
memset(dev->rd_msg_hdr, 0, sizeof(dev->rd_msg_hdr));
+ dev->rd_msg_hdr_count = 0;
*slots = mei_count_full_read_slots(dev);
if (*slots == -EOVERFLOW) {
/* overflow - reset */
- dev_err(dev->dev, "resetting due to slots overflow.\n");
+ dev_err(&dev->dev, "resetting due to slots overflow.\n");
/* set the event since message has been read */
ret = -ERANGE;
goto end;
@@ -385,7 +522,7 @@ int mei_irq_write_handler(struct mei_device *dev, struct list_head *cmpl_list)
return -EMSGSIZE;
/* complete all waiting for write CB */
- dev_dbg(dev->dev, "complete all waiting for write cb.\n");
+ dev_dbg(&dev->dev, "complete all waiting for write cb.\n");
list_for_each_entry_safe(cb, next, &dev->write_waiting_list, list) {
cl = cb->cl;
@@ -397,7 +534,7 @@ int mei_irq_write_handler(struct mei_device *dev, struct list_head *cmpl_list)
}
/* complete control write list CB */
- dev_dbg(dev->dev, "complete control write list cb.\n");
+ dev_dbg(&dev->dev, "complete control write list cb.\n");
list_for_each_entry_safe(cb, next, &dev->ctrl_wr_list, list) {
cl = cb->cl;
switch (cb->fop_type) {
@@ -435,13 +572,23 @@ int mei_irq_write_handler(struct mei_device *dev, struct list_head *cmpl_list)
if (ret)
return ret;
break;
+ case MEI_FOP_DMA_MAP:
+ ret = mei_cl_irq_dma_map(cl, cb, cmpl_list);
+ if (ret)
+ return ret;
+ break;
+ case MEI_FOP_DMA_UNMAP:
+ ret = mei_cl_irq_dma_unmap(cl, cb, cmpl_list);
+ if (ret)
+ return ret;
+ break;
default:
BUG();
}
}
/* complete write list CB */
- dev_dbg(dev->dev, "complete write list cb.\n");
+ dev_dbg(&dev->dev, "complete write list cb.\n");
list_for_each_entry_safe(cb, next, &dev->write_list, list) {
cl = cb->cl;
ret = mei_cl_irq_write(cl, cb, cmpl_list);
@@ -476,9 +623,9 @@ static void mei_connect_timeout(struct mei_cl *cl)
/**
* mei_schedule_stall_timer - re-arm stall_timer work
*
- * Schedule stall timer
- *
* @dev: the device structure
+ *
+ * Schedule stall timer
*/
void mei_schedule_stall_timer(struct mei_device *dev)
{
@@ -506,7 +653,7 @@ void mei_timer(struct work_struct *work)
if (dev->init_clients_timer) {
if (--dev->init_clients_timer == 0) {
- dev_err(dev->dev, "timer: init clients timeout hbm_state = %d.\n",
+ dev_err(&dev->dev, "timer: init clients timeout hbm_state = %d.\n",
dev->hbm_state);
mei_reset(dev);
goto out;
@@ -522,7 +669,7 @@ void mei_timer(struct work_struct *work)
list_for_each_entry(cl, &dev->file_list, link) {
if (cl->timer_count) {
if (--cl->timer_count == 0) {
- dev_err(dev->dev, "timer: connect/disconnect timeout.\n");
+ dev_err(&dev->dev, "timer: connect/disconnect timeout.\n");
mei_connect_timeout(cl);
goto out;
}
generated by cgit (git 2.34.1) at 2025-12-25 13:11:47 +0000