@@ -217,6 +217,45 @@ unsigned int host1x_cdma_wait_locked(struct host1x_cdma *cdma,
return 0;
}
+/*
+ * Sleep (if necessary) until the push buffer has enough free space.
+ *
+ * Must be called with the cdma lock held.
+ */
+int host1x_cdma_wait_pushbuffer_space(struct host1x *host1x,
+ struct host1x_cdma *cdma,
+ unsigned int needed)
+{
+ while (true) {
+ struct push_buffer *pb = &cdma->push_buffer;
+ unsigned int space;
+
+ space = host1x_pushbuffer_space(pb);
+ if (space >= needed)
+ break;
+
+ trace_host1x_wait_cdma(dev_name(cdma_to_channel(cdma)->dev),
+ CDMA_EVENT_PUSH_BUFFER_SPACE);
+
+ host1x_hw_cdma_flush(host1x, cdma);
+
+ /* If somebody has managed to already start waiting, yield */
+ if (cdma->event != CDMA_EVENT_NONE) {
+ mutex_unlock(&cdma->lock);
+ schedule();
+ mutex_lock(&cdma->lock);
+ continue;
+ }
+
+ cdma->event = CDMA_EVENT_PUSH_BUFFER_SPACE;
+
+ mutex_unlock(&cdma->lock);
+ down(&cdma->sem);
+ mutex_lock(&cdma->lock);
+ }
+
+ return 0;
+}
/*
* Start timer that tracks the time spent by the job.
* Must be called with the cdma lock held.
@@ -509,6 +548,59 @@ void host1x_cdma_push(struct host1x_cdma *cdma, u32 op1, u32 op2)
host1x_pushbuffer_push(pb, op1, op2);
}
+/*
+ * Push four words into two consecutive push buffer slots. Note that extra
+ * care needs to be taken not to split the two slots across the end of the
+ * push buffer. Otherwise the RESTART opcode at the end of the push buffer
+ * that ensures processing will restart at the beginning will break up the
+ * four words.
+ *
+ * Blocks as necessary if the push buffer is full.
+ */
+void host1x_cdma_push_wide(struct host1x_cdma *cdma, u32 op1, u32 op2,
+ u32 op3, u32 op4)
+{
+ struct host1x_channel *channel = cdma_to_channel(cdma);
+ struct host1x *host1x = cdma_to_host1x(cdma);
+ struct push_buffer *pb = &cdma->push_buffer;
+ unsigned int needed = 2, extra = 0, i;
+ unsigned int space = cdma->slots_free;
+
+ if (host1x_debug_trace_cmdbuf)
+ trace_host1x_cdma_push_wide(dev_name(channel->dev), op1, op2,
+ op3, op4);
+
+ /* compute number of extra slots needed for padding */
+ if (pb->pos + 16 > pb->size) {
+ extra = (pb->size - pb->pos) / 8;
+ needed += extra;
+ }
+
+ host1x_cdma_wait_pushbuffer_space(host1x, cdma, needed);
+ space = host1x_pushbuffer_space(pb);
+
+ cdma->slots_free = space - needed;
+ cdma->slots_used += needed;
+
+ /*
+ * Note that we rely on the fact that this is only used to submit wide
+ * gather opcodes, which consist of 3 words, and they are padded with
+ * a NOP to avoid having to deal with fractional slots (a slot always
+ * represents 2 words). The fourth opcode passed to this function will
+ * therefore always be a NOP.
+ *
+ * This works around a slight ambiguity when it comes to opcodes. For
+ * all current host1x incarnations the NOP opcode uses the exact same
+ * encoding (0x20000000), so we could hard-code the value here, but a
+ * new incarnation may change it and break that assumption.
+ */
+ for (i = 0; i < extra; i++)
+ host1x_pushbuffer_push(pb, op4, op4);
+
+ host1x_pushbuffer_push(pb, op1, op2);
+ host1x_pushbuffer_push(pb, op3, op4);
+}
+
/*
* End a cdma submit
* Kick off DMA, add job to the sync queue, and a number of slots to be freed
@@ -90,6 +90,8 @@ int host1x_cdma_init(struct host1x_cdma *cdma);
int host1x_cdma_deinit(struct host1x_cdma *cdma);
int host1x_cdma_begin(struct host1x_cdma *cdma, struct host1x_job *job);
void host1x_cdma_push(struct host1x_cdma *cdma, u32 op1, u32 op2);
+void host1x_cdma_push_wide(struct host1x_cdma *cdma, u32 op1, u32 op2,
+ u32 op3, u32 op4);
void host1x_cdma_end(struct host1x_cdma *cdma, struct host1x_job *job);
void host1x_cdma_update(struct host1x_cdma *cdma);
void host1x_cdma_peek(struct host1x_cdma *cdma, u32 dmaget, int slot,
@@ -80,6 +80,32 @@ TRACE_EVENT(host1x_cdma_push,
__entry->name, __entry->op1, __entry->op2)
);
+TRACE_EVENT(host1x_cdma_push_wide,
+ TP_PROTO(const char *name, u32 op1, u32 op2, u32 op3, u32 op4),
+
+ TP_ARGS(name, op1, op2, op3, op4),
+
+ TP_STRUCT__entry(
+ __field(const char *, name)
+ __field(u32, op1)
+ __field(u32, op2)
+ __field(u32, op3)
+ __field(u32, op4)
+ ),
+
+ TP_fast_assign(
+ __entry->name = name;
+ __entry->op1 = op1;
+ __entry->op2 = op2;
+ __entry->op3 = op3;
+ __entry->op4 = op4;
+ ),
+
+ TP_printk("name=%s, op1=%08x, op2=%08x, op3=%08x op4=%08x",
+ __entry->name, __entry->op1, __entry->op2, __entry->op3,
+ __entry->op4)
+);
+
TRACE_EVENT(host1x_cdma_push_gather,
TP_PROTO(const char *name, struct host1x_bo *bo,
u32 words, u32 offset, void *cmdbuf),