V4L/DVB (6054): ivtv: specify some stream sizes in kB instead of MB

Some streams (PCM, VBI decoding) do not need that much memory, so specify
the allocated memory in kB instead of MB to limit memory usage. E.g. 1 MB
is overkill for the VBI decoding stream, 64 kB is enough.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/ivtv/ivtv-driver.c

@@ -208,7 +208,7 @@ MODULE_PARM_DESC(enc_vbi_buffers,
 		 "Encoder VBI Buffers (in MB)\n"
 		 "\t\t\tDefault: " __stringify(IVTV_DEFAULT_ENC_VBI_BUFFERS));
 MODULE_PARM_DESC(enc_pcm_buffers,
-		 "Encoder PCM buffers (in MB)\n"
+		 "Encoder PCM buffers (in kB)\n"
 		 "\t\t\tDefault: " __stringify(IVTV_DEFAULT_ENC_PCM_BUFFERS));
 MODULE_PARM_DESC(dec_mpg_buffers,
 		 "Decoder MPG buffers (in MB)\n"
@@ -217,7 +217,7 @@ MODULE_PARM_DESC(dec_yuv_buffers,
 		 "Decoder YUV buffers (in MB)\n"
 		 "\t\t\tDefault: " __stringify(IVTV_DEFAULT_DEC_YUV_BUFFERS));
 MODULE_PARM_DESC(dec_vbi_buffers,
-		 "Decoder VBI buffers (in MB)\n"
+		 "Decoder VBI buffers (in kB)\n"
 		 "\t\t\tDefault: " __stringify(IVTV_DEFAULT_DEC_VBI_BUFFERS));
 MODULE_PARM_DESC(newi2c,
 		 "Use new I2C implementation\n"
@@ -547,13 +547,13 @@ static void ivtv_process_options(struct ivtv *itv)
 	const char *chipname;
 	int i, j;
 
-	itv->options.megabytes[IVTV_ENC_STREAM_TYPE_MPG] = enc_mpg_buffers;
-	itv->options.megabytes[IVTV_ENC_STREAM_TYPE_YUV] = enc_yuv_buffers;
-	itv->options.megabytes[IVTV_ENC_STREAM_TYPE_VBI] = enc_vbi_buffers;
-	itv->options.megabytes[IVTV_ENC_STREAM_TYPE_PCM] = enc_pcm_buffers;
-	itv->options.megabytes[IVTV_DEC_STREAM_TYPE_MPG] = dec_mpg_buffers;
-	itv->options.megabytes[IVTV_DEC_STREAM_TYPE_YUV] = dec_yuv_buffers;
-	itv->options.megabytes[IVTV_DEC_STREAM_TYPE_VBI] = dec_vbi_buffers;
+	itv->options.kilobytes[IVTV_ENC_STREAM_TYPE_MPG] = enc_mpg_buffers * 1024;
+	itv->options.kilobytes[IVTV_ENC_STREAM_TYPE_YUV] = enc_yuv_buffers * 1024;
+	itv->options.kilobytes[IVTV_ENC_STREAM_TYPE_VBI] = enc_vbi_buffers * 1024;
+	itv->options.kilobytes[IVTV_ENC_STREAM_TYPE_PCM] = enc_pcm_buffers;
+	itv->options.kilobytes[IVTV_DEC_STREAM_TYPE_MPG] = dec_mpg_buffers * 1024;
+	itv->options.kilobytes[IVTV_DEC_STREAM_TYPE_YUV] = dec_yuv_buffers * 1024;
+	itv->options.kilobytes[IVTV_DEC_STREAM_TYPE_VBI] = dec_vbi_buffers;
 	itv->options.cardtype = cardtype[itv->num];
 	itv->options.tuner = tuner[itv->num];
 	itv->options.radio = radio[itv->num];

drivers/media/video/ivtv/ivtv-driver.h

@@ -186,10 +186,12 @@ extern const u32 yuv_offset[4];
 #define IVTV_DEFAULT_ENC_MPG_BUFFERS 4
 #define IVTV_DEFAULT_ENC_YUV_BUFFERS 2
 #define IVTV_DEFAULT_ENC_VBI_BUFFERS 1
-#define IVTV_DEFAULT_ENC_PCM_BUFFERS 1
+/* Exception: size in kB for this stream (MB is overkill) */
+#define IVTV_DEFAULT_ENC_PCM_BUFFERS 320
 #define IVTV_DEFAULT_DEC_MPG_BUFFERS 1
 #define IVTV_DEFAULT_DEC_YUV_BUFFERS 1
-#define IVTV_DEFAULT_DEC_VBI_BUFFERS 1
+/* Exception: size in kB for this stream (MB is way overkill) */
+#define IVTV_DEFAULT_DEC_VBI_BUFFERS 64
 
 /* ======================================================================== */
 /* ========================== END USER SETTABLE DMA VARIABLES ============= */
@@ -321,7 +323,7 @@ extern int ivtv_debug;
 
 
 struct ivtv_options {
-	int megabytes[IVTV_MAX_STREAMS]; /* Size in megabytes of each stream */
+	int kilobytes[IVTV_MAX_STREAMS]; /* Size in kilobytes of each stream */
 	int cardtype;		/* force card type on load */
 	int tuner;		/* set tuner on load */
 	int radio;		/* enable/disable radio */

drivers/media/video/ivtv/ivtv-streams.c

@@ -150,7 +150,7 @@ static void ivtv_stream_init(struct ivtv *itv, int type)
 		s->dma = ivtv_stream_info[type].dma;
 	s->buf_size = itv->stream_buf_size[type];
 	if (s->buf_size)
-		s->buffers = itv->options.megabytes[type] * 1024 * 1024 / s->buf_size;
+		s->buffers = (itv->options.kilobytes[type] * 1024 + s->buf_size - 1) / s->buf_size;
 	spin_lock_init(&s->qlock);
 	init_waitqueue_head(&s->waitq);
 	s->id = -1;
@@ -192,7 +192,7 @@ static int ivtv_reg_dev(struct ivtv *itv, int type)
 	/* User explicitly selected 0 buffers for these streams, so don't
 	   create them. */
 	if (minor >= 0 && ivtv_stream_info[type].dma != PCI_DMA_NONE &&
-	    itv->options.megabytes[type] == 0) {
+	    itv->options.kilobytes[type] == 0) {
 		IVTV_INFO("Disabled %s device\n", ivtv_stream_info[type].name);
 		return 0;
 	}
@@ -238,18 +238,18 @@ static int ivtv_reg_dev(struct ivtv *itv, int type)
 
 	switch (vfl_type) {
 	case VFL_TYPE_GRABBER:
-		IVTV_INFO("Registered device video%d for %s (%d MB)\n",
-			s->v4l2dev->minor, s->name, itv->options.megabytes[type]);
+		IVTV_INFO("Registered device video%d for %s (%d kB)\n",
+			s->v4l2dev->minor, s->name, itv->options.kilobytes[type]);
 		break;
 	case VFL_TYPE_RADIO:
 		IVTV_INFO("Registered device radio%d for %s\n",
 			s->v4l2dev->minor - MINOR_VFL_TYPE_RADIO_MIN, s->name);
 		break;
 	case VFL_TYPE_VBI:
-		if (itv->options.megabytes[type])
-			IVTV_INFO("Registered device vbi%d for %s (%d MB)\n",
+		if (itv->options.kilobytes[type])
+			IVTV_INFO("Registered device vbi%d for %s (%d kB)\n",
 				s->v4l2dev->minor - MINOR_VFL_TYPE_VBI_MIN,
-				s->name, itv->options.megabytes[type]);
+				s->name, itv->options.kilobytes[type]);
 		else
 			IVTV_INFO("Registered device vbi%d for %s\n",
 				s->v4l2dev->minor - MINOR_VFL_TYPE_VBI_MIN, s->name);