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Diffstat (limited to 'drivers/misc/mei/interrupt.c')
-rw-r--r--drivers/misc/mei/interrupt.c113
1 files changed, 99 insertions, 14 deletions
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index c70a8c74cc57..326955b04fda 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -61,16 +61,21 @@ 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
* that length fits into rd_msg_buf
*/
- mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
+ 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 +85,29 @@ 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;
+
size_t buf_sz;
u32 length;
+ int 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 +121,50 @@ 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;
+ struct mei_ext_hdr *vtag = NULL;
+
+ ext = mei_ext_begin(meta);
+ do {
+ switch (ext->type) {
+ case MEI_EXT_HDR_VTAG:
+ vtag = ext;
+ break;
+ case MEI_EXT_HDR_NONE:
+ fallthrough;
+ default:
+ cb->status = -EPROTO;
+ break;
+ }
+
+ ext = mei_ext_next(ext);
+ } while (!mei_ext_last(meta, ext));
+
+ if (!vtag) {
+ cl_dbg(dev, cl, "vtag not found in extended header.\n");
+ cb->status = -EPROTO;
+ goto discard;
+ }
+
+ cl_dbg(dev, cl, "vtag: %d\n", vtag->ext_payload[0]);
+ if (cb->vtag && cb->vtag != vtag->ext_payload[0]) {
+ cl_err(dev, cl, "mismatched tag: %d != %d\n",
+ cb->vtag, vtag->ext_payload[0]);
+ cb->status = -EPROTO;
+ goto discard;
+ }
+ cb->vtag = vtag->ext_payload[0];
+ }
+
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 +182,13 @@ 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;
@@ -150,7 +205,7 @@ 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;
}
@@ -265,11 +320,16 @@ 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 ext_meta_hdr_u32;
+ 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);
@@ -292,10 +352,34 @@ int mei_irq_read_handler(struct mei_device *dev,
goto end;
}
+ ext_hdr_end = 1;
+
+ if (mei_hdr->extended) {
+ if (!dev->rd_msg_hdr[1]) {
+ ext_meta_hdr_u32 = mei_read_hdr(dev);
+ dev->rd_msg_hdr[1] = ext_meta_hdr_u32;
+ dev->rd_msg_hdr_count++;
+ (*slots)--;
+ dev_dbg(dev->dev, "extended header is %08x\n",
+ ext_meta_hdr_u32);
+ }
+ meta_hdr = ((struct mei_ext_meta_hdr *)
+ dev->rd_msg_hdr + 1);
+ 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);
+ 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 */
@@ -326,7 +410,7 @@ int mei_irq_read_handler(struct mei_device *dev,
*/
if (hdr_is_fixed(mei_hdr) ||
dev->dev_state == MEI_DEV_POWER_DOWN) {
- mei_irq_discard_msg(dev, mei_hdr);
+ mei_irq_discard_msg(dev, mei_hdr, mei_hdr->length);
ret = 0;
goto reset_slots;
}
@@ -336,12 +420,13 @@ int mei_irq_read_handler(struct mei_device *dev,
goto end;
}
- ret = mei_cl_irq_read_msg(cl, mei_hdr, cmpl_list);
+ ret = mei_cl_irq_read_msg(cl, mei_hdr, meta_hdr, cmpl_list);
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 */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.