cx->card_i2c = cx->card->i2c;
}
+static int __devinit cx18_create_in_workq(struct cx18 *cx)
+{
+ snprintf(cx->in_workq_name, sizeof(cx->in_workq_name), "%s-in",
+ cx->v4l2_dev.name);
+ cx->in_work_queue = create_singlethread_workqueue(cx->in_workq_name);
+ if (cx->in_work_queue == NULL) {
+ CX18_ERR("Unable to create incoming mailbox handler thread\n");
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static int __devinit cx18_create_out_workq(struct cx18 *cx)
+{
+ snprintf(cx->out_workq_name, sizeof(cx->out_workq_name), "%s-out",
+ cx->v4l2_dev.name);
+ cx->out_work_queue = create_workqueue(cx->out_workq_name);
+ if (cx->out_work_queue == NULL) {
+ CX18_ERR("Unable to create outgoing mailbox handler threads\n");
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static void __devinit cx18_init_in_work_orders(struct cx18 *cx)
+{
+ int i;
+ for (i = 0; i < CX18_MAX_IN_WORK_ORDERS; i++) {
+ cx->in_work_order[i].cx = cx;
+ cx->in_work_order[i].str = cx->epu_debug_str;
+ INIT_WORK(&cx->in_work_order[i].work, cx18_in_work_handler);
+ }
+}
+
+static void __devinit cx18_init_out_work_orders(struct cx18 *cx)
+{
+ int i;
+ for (i = 0; i < CX18_MAX_OUT_WORK_ORDERS; i++)
+ INIT_WORK(&cx->out_work_order[i].work, cx18_out_work_handler);
+}
+
/* Precondition: the cx18 structure has been memset to 0. Only
the dev and instance fields have been filled in.
No assumptions on the card type may be made here (see cx18_init_struct2
*/
static int __devinit cx18_init_struct1(struct cx18 *cx)
{
- int i;
+ int ret;
cx->base_addr = pci_resource_start(cx->pci_dev, 0);
mutex_init(&cx->epu2apu_mb_lock);
mutex_init(&cx->epu2cpu_mb_lock);
- snprintf(cx->in_workq_name, sizeof(cx->in_workq_name), "%s-in",
- cx->v4l2_dev.name);
- cx->in_work_queue = create_singlethread_workqueue(cx->in_workq_name);
- if (cx->in_work_queue == NULL) {
- CX18_ERR("Unable to create incoming mailbox handler thread\n");
- return -ENOMEM;
- }
+ ret = cx18_create_out_workq(cx);
+ if (ret)
+ return ret;
- for (i = 0; i < CX18_MAX_IN_WORK_ORDERS; i++) {
- cx->in_work_order[i].cx = cx;
- cx->in_work_order[i].str = cx->epu_debug_str;
- INIT_WORK(&cx->in_work_order[i].work, cx18_in_work_handler);
+ ret = cx18_create_in_workq(cx);
+ if (ret) {
+ destroy_workqueue(cx->out_work_queue);
+ return ret;
}
+ cx18_init_out_work_orders(cx);
+ cx18_init_in_work_orders(cx);
+
/* start counting open_id at 1 */
cx->open_id = 1;
retval = -ENODEV;
goto err;
}
- if (cx18_init_struct1(cx)) {
- retval = -ENOMEM;
+
+ retval = cx18_init_struct1(cx);
+ if (retval)
goto err;
- }
CX18_DEBUG_INFO("base addr: 0x%08x\n", cx->base_addr);
/* PCI Device Setup */
retval = cx18_setup_pci(cx, pci_dev, pci_id);
if (retval != 0)
- goto free_workqueue;
+ goto free_workqueues;
/* map io memory */
CX18_DEBUG_INFO("attempting ioremap at 0x%08x len 0x%08x\n",
cx18_iounmap(cx);
free_mem:
release_mem_region(cx->base_addr, CX18_MEM_SIZE);
-free_workqueue:
+free_workqueues:
destroy_workqueue(cx->in_work_queue);
+ destroy_workqueue(cx->out_work_queue);
err:
if (retval == 0)
retval = -ENODEV;
if (atomic_read(&cx->tot_capturing) > 0)
cx18_stop_all_captures(cx);
- /* Interrupts */
+ /* Stop interrupts that cause incoming work to be queued */
cx18_sw1_irq_disable(cx, IRQ_CPU_TO_EPU | IRQ_APU_TO_EPU);
+
+ /* Incoming work can cause outgoing work, so clean up incoming first */
+ cx18_cancel_in_work_orders(cx);
+
+ /*
+ * An outgoing work order can have the only pointer to a dynamically
+ * allocated buffer, so we need to flush outgoing work and not just
+ * cancel it, so we don't lose the pointer and leak memory.
+ */
+ flush_workqueue(cx->out_work_queue);
+
+ /* Stop ack interrupts that may have been needed for work to finish */
cx18_sw2_irq_disable(cx, IRQ_CPU_TO_EPU_ACK | IRQ_APU_TO_EPU_ACK);
cx18_halt_firmware(cx);
- cx18_cancel_in_work_orders(cx);
-
destroy_workqueue(cx->in_work_queue);
+ destroy_workqueue(cx->out_work_queue);
cx18_streams_cleanup(cx, 1);
#define CX18_F_S_INTERNAL_USE 5 /* this stream is used internally (sliced VBI processing) */
#define CX18_F_S_STREAMOFF 7 /* signal end of stream EOS */
#define CX18_F_S_APPL_IO 8 /* this stream is used read/written by an application */
+#define CX18_F_S_STOPPING 9 /* telling the fw to stop capturing */
/* per-cx18, i_flags */
#define CX18_F_I_LOADED_FW 0 /* Loaded firmware 1st time */
char *str;
};
+/*
+ * There are 2 types of deferrable tasks that send messages out to the firmware:
+ * 1. Sending individual buffers back to the firmware
+ * 2. Sending as many free buffers for a stream from q_free as we can to the fw
+ *
+ * The worst case scenario for multiple simultaneous streams is
+ * TS, YUV, PCM, VBI, MPEG, and IDX all going at once.
+ *
+ * We try to load the firmware queue with as many free buffers as possible,
+ * whenever we get a buffer back for a stream. For the TS we return the single
+ * buffer to the firmware at that time as well. For all other streams, we
+ * return single buffers to the firmware as the application drains them.
+ *
+ * 6 streams * 2 sets of orders * (1 single buf + 1 load fw from q_free)
+ * = 24 work orders should cover our needs, provided the applications read
+ * at a fairly steady rate. If apps don't, we fall back to non-deferred
+ * operation, when no cx18_out_work_orders are available for use.
+ */
+#define CX18_MAX_OUT_WORK_ORDERS (24)
+
+struct cx18_out_work_order {
+ struct work_struct work;
+ atomic_t pending;
+ struct cx18_stream *s;
+ struct cx18_buffer *buf; /* buf == NULL, means load fw from q_free */
+};
+
#define CX18_INVALID_TASK_HANDLE 0xffffffff
struct cx18_stream {
struct cx18_in_work_order in_work_order[CX18_MAX_IN_WORK_ORDERS];
char epu_debug_str[256]; /* CX18_EPU_DEBUG is rare: use shared space */
+ struct workqueue_struct *out_work_queue;
+ char out_workq_name[12]; /* "cx18-NN-out" */
+ struct cx18_out_work_order out_work_order[CX18_MAX_OUT_WORK_ORDERS];
+
/* i2c */
struct i2c_adapter i2c_adap[2];
struct i2c_algo_bit_data i2c_algo[2];
cx18_api(cx, CX18_CPU_SET_RAW_VBI_PARAM, 6, data);
}
-struct cx18_queue *cx18_stream_put_buf_fw(struct cx18_stream *s,
- struct cx18_buffer *buf)
+static
+struct cx18_queue *_cx18_stream_put_buf_fw(struct cx18_stream *s,
+ struct cx18_buffer *buf)
{
struct cx18 *cx = s->cx;
struct cx18_queue *q;
/* Don't give it to the firmware, if we're not running a capture */
if (s->handle == CX18_INVALID_TASK_HANDLE ||
+ test_bit(CX18_F_S_STOPPING, &s->s_flags) ||
!test_bit(CX18_F_S_STREAMING, &s->s_flags))
return cx18_enqueue(s, buf, &s->q_free);
return q;
}
-void cx18_stream_load_fw_queue(struct cx18_stream *s)
+static
+void _cx18_stream_load_fw_queue(struct cx18_stream *s)
{
struct cx18_queue *q;
struct cx18_buffer *buf;
buf = cx18_dequeue(s, &s->q_free);
if (buf == NULL)
break;
- q = cx18_stream_put_buf_fw(s, buf);
+ q = _cx18_stream_put_buf_fw(s, buf);
} while (atomic_read(&s->q_busy.buffers) < CX18_MAX_FW_MDLS_PER_STREAM
&& q == &s->q_busy);
}
+static inline
+void free_out_work_order(struct cx18_out_work_order *order)
+{
+ atomic_set(&order->pending, 0);
+}
+
+void cx18_out_work_handler(struct work_struct *work)
+{
+ struct cx18_out_work_order *order =
+ container_of(work, struct cx18_out_work_order, work);
+ struct cx18_stream *s = order->s;
+ struct cx18_buffer *buf = order->buf;
+
+ free_out_work_order(order);
+
+ if (buf == NULL)
+ _cx18_stream_load_fw_queue(s);
+ else
+ _cx18_stream_put_buf_fw(s, buf);
+}
+
+static
+struct cx18_out_work_order *alloc_out_work_order(struct cx18 *cx)
+{
+ int i;
+ struct cx18_out_work_order *order = NULL;
+
+ for (i = 0; i < CX18_MAX_OUT_WORK_ORDERS; i++) {
+ /*
+ * We need "pending" to be atomic to inspect & set its contents
+ * 1. "pending" is only set to 1 here, but needs multiple access
+ * protection
+ * 2. work handler threads only clear "pending" and only
+ * on one, particular work order at a time, per handler thread.
+ */
+ if (atomic_add_unless(&cx->out_work_order[i].pending, 1, 1)) {
+ order = &cx->out_work_order[i];
+ break;
+ }
+ }
+ return order;
+}
+
+struct cx18_queue *cx18_stream_put_buf_fw(struct cx18_stream *s,
+ struct cx18_buffer *buf)
+{
+ struct cx18 *cx = s->cx;
+ struct cx18_out_work_order *order;
+
+ order = alloc_out_work_order(cx);
+ if (order == NULL) {
+ CX18_DEBUG_WARN("No blank, outgoing-mailbox, deferred-work, "
+ "order forms available; sending buffer %u back "
+ "to the firmware immediately for stream %s\n",
+ buf->id, s->name);
+ return _cx18_stream_put_buf_fw(s, buf);
+ }
+ order->s = s;
+ order->buf = buf;
+ queue_work(cx->out_work_queue, &order->work);
+ return NULL;
+}
+
+void cx18_stream_load_fw_queue(struct cx18_stream *s)
+{
+ struct cx18 *cx = s->cx;
+ struct cx18_out_work_order *order;
+
+ order = alloc_out_work_order(cx);
+ if (order == NULL) {
+ CX18_DEBUG_WARN("No blank, outgoing-mailbox, deferred-work, "
+ "order forms available; filling the firmware "
+ "buffer queue immediately for stream %s\n",
+ s->name);
+ _cx18_stream_load_fw_queue(s);
+ return;
+ }
+ order->s = s;
+ order->buf = NULL; /* Indicates to load the fw queue */
+ queue_work(cx->out_work_queue, &order->work);
+}
+
int cx18_start_v4l2_encode_stream(struct cx18_stream *s)
{
u32 data[MAX_MB_ARGUMENTS];
cx18_writel(cx, s->buf_size, &cx->scb->cpu_mdl[buf->id].length);
}
mutex_unlock(&s->qlock);
- cx18_stream_load_fw_queue(s);
+ _cx18_stream_load_fw_queue(s);
/* begin_capture */
if (cx18_vapi(cx, CX18_CPU_CAPTURE_START, 1, s->handle)) {
CX18_DEBUG_WARN("Error starting capture!\n");
/* Ensure we're really not capturing before releasing MDLs */
+ set_bit(CX18_F_S_STOPPING, &s->s_flags);
if (s->type == CX18_ENC_STREAM_TYPE_MPG)
cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 2, s->handle, 1);
else
cx18_vapi(cx, CX18_CPU_DE_RELEASE_MDL, 1, s->handle);
cx18_vapi(cx, CX18_DESTROY_TASK, 1, s->handle);
s->handle = CX18_INVALID_TASK_HANDLE;
+ clear_bit(CX18_F_S_STOPPING, &s->s_flags);
if (atomic_read(&cx->tot_capturing) == 0) {
set_bit(CX18_F_I_EOS, &cx->i_flags);
cx18_write_reg(cx, 5, CX18_DSP0_INTERRUPT_MASK);
if (atomic_read(&cx->tot_capturing) == 0)
return 0;
+ set_bit(CX18_F_S_STOPPING, &s->s_flags);
if (s->type == CX18_ENC_STREAM_TYPE_MPG)
cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 2, s->handle, !gop_end);
else
cx18_vapi(cx, CX18_DESTROY_TASK, 1, s->handle);
s->handle = CX18_INVALID_TASK_HANDLE;
+ clear_bit(CX18_F_S_STOPPING, &s->s_flags);
if (atomic_read(&cx->tot_capturing) > 0)
return 0;
int cx18_streams_register(struct cx18 *cx);
void cx18_streams_cleanup(struct cx18 *cx, int unregister);
-/* Capture related */
+/* Related to submission of buffers to firmware */
void cx18_stream_load_fw_queue(struct cx18_stream *s);
struct cx18_queue *cx18_stream_put_buf_fw(struct cx18_stream *s,
struct cx18_buffer *buf);
+void cx18_out_work_handler(struct work_struct *work);
+
+/* Capture related */
int cx18_start_v4l2_encode_stream(struct cx18_stream *s);
int cx18_stop_v4l2_encode_stream(struct cx18_stream *s, int gop_end);
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff