Hello again !
Here comes a Patch which does the following changes for all ttpci budget
cards:
- Issue a warning when more than 80% of the DMA buffer is being used
(probably due to bad IRQ latency)
Warnings are limited to the first 100 warnings and after that one
warning for every 100 buffer overruns.
- Introduce a new parameter "bufsize" (in k) which increases the default
DMA buffer of 188k up to 4 MB
A buffer size of 470k does it for me even at high I/O load conditions.
Signed-off-by: Ingo Schneider <mail at ingo-schneider.de>
Regards,
Ingo Schneider.
diff -urw drivers/media/dvb/ttpci/budget-core.c /usr/src/linux-2.6.15.2/drivers/media/dvb/ttpci/budget-core.c
--- drivers/media/dvb/ttpci/budget-core.c 2005-12-27 01:26:33.000000000 +0100
+++ /usr/src/linux-2.6.15.2/drivers/media/dvb/ttpci/budget-core.c 2006-02-19 19:16:23.000000000 +0100
@@ -39,9 +39,20 @@
#include "budget.h"
#include "ttpci-eeprom.h"
+#define TS_DEFAULT_WIDTH 376
+#define TS_DEFAULT_HEIGHT 512
+#define TS_MOD_WIDTH 376 // 2 * TS_SIZE (% 8 == 0)
+#define TS_MOD_HEIGHT 256 // 0x0100
+#define TS_MAX_WIDTH 3760 // 10 * (2*TS_SIZE)
+#define TS_MAX_HEIGHT 3840 // 0x0f00
+#define TS_MIN_BUFSIZE_K 188
+#define TS_MAX_BUFSIZE_K 4096 // SAA7146 can handle at most 4 MB DMA
int budget_debug;
+static int budget_dma_buffer_size;
module_param_named(debug, budget_debug, int, 0644);
+module_param_named(bufsize, budget_dma_buffer_size, int, 0444);
MODULE_PARM_DESC(debug, "Turn on/off budget debugging (default:off).");
+MODULE_PARM_DESC(bufsize, "DMA buffer size in kB (default: 188, max: 4096).");
/****************************************************************************
* TT budget / WinTV Nova
@@ -70,7 +81,7 @@
saa7146_write(dev, MC1, MASK_20); // DMA3 off
- memset(budget->grabbing, 0x00, TS_HEIGHT * TS_WIDTH);
+ memset(budget->grabbing, 0x00, budget->buffer_size);
saa7146_write(dev, PCI_BT_V1, 0x001c0000 | (saa7146_read(dev, PCI_BT_V1) & ~0x001f0000));
@@ -115,16 +126,12 @@
saa7146_write(dev, BASE_ODD3, 0);
saa7146_write(dev, BASE_EVEN3, 0);
- saa7146_write(dev, PROT_ADDR3, TS_WIDTH * TS_HEIGHT);
+ saa7146_write(dev, PROT_ADDR3, budget->buffer_size);
saa7146_write(dev, BASE_PAGE3, budget->pt.dma | ME1 | 0x90);
- if (budget->card->type == BUDGET_FS_ACTIVY) {
- saa7146_write(dev, PITCH3, TS_WIDTH / 2);
- saa7146_write(dev, NUM_LINE_BYTE3, ((TS_HEIGHT * 2) << 16) | (TS_WIDTH / 2));
- } else {
- saa7146_write(dev, PITCH3, TS_WIDTH);
- saa7146_write(dev, NUM_LINE_BYTE3, (TS_HEIGHT << 16) | TS_WIDTH);
- }
+ saa7146_write(dev, PITCH3, budget->buffer_width);
+ saa7146_write(dev, NUM_LINE_BYTE3,
+ (budget->buffer_height << 16) | budget->buffer_width);
saa7146_write(dev, MC2, (MASK_04 | MASK_20));
@@ -141,11 +148,12 @@
u8 *mem = (u8 *) (budget->grabbing);
u32 olddma = budget->ttbp;
u32 newdma = saa7146_read(budget->dev, PCI_VDP3);
+ int count = 0;
/* nearest lower position divisible by 188 */
newdma -= newdma % 188;
- if (newdma >= TS_BUFLEN)
+ if (newdma >= budget->buffer_size)
return;
budget->ttbp = newdma;
@@ -154,11 +162,21 @@
return;
if (newdma > olddma) { /* no wraparound, dump olddma..newdma */
- dvb_dmx_swfilter_packets(&budget->demux, mem + olddma, (newdma - olddma) / 188);
+ count = (newdma - olddma);
+ dvb_dmx_swfilter_packets(&budget->demux, mem + olddma, count / 188);
} else { /* wraparound, dump olddma..buflen and 0..newdma */
- dvb_dmx_swfilter_packets(&budget->demux, mem + olddma, (TS_BUFLEN - olddma) / 188);
+ count = budget->buffer_size - olddma;
+ dvb_dmx_swfilter_packets(&budget->demux, mem + olddma, count / 188);
+ count += newdma;
dvb_dmx_swfilter_packets(&budget->demux, mem, newdma / 188);
}
+ if (count > (budget->buffer_size * 80/100)) {
+ budget->buffer_warnings++;
+ if (budget->buffer_warnings < 100 || budget->buffer_warnings % 100 == 0) {
+ printk("ttpci vpeirq: used %d times >80%% of buffer (%d bytes now)\n",
+ budget->buffer_warnings, count);
+ }
+ }
}
@@ -337,11 +355,17 @@
dvb_dmx_release(&budget->demux);
}
+static int budget_mod_limit(int value, int mod, int limit)
+{
+ if (value > limit)
+ return limit - limit % mod;
+ else
+ return value - value % mod;
+}
int ttpci_budget_init(struct budget *budget, struct saa7146_dev *dev,
struct saa7146_pci_extension_data *info,
struct module *owner)
{
- int length = TS_WIDTH * TS_HEIGHT;
int ret = 0;
struct budget_info *bi = info->ext_priv;
@@ -352,6 +376,37 @@
budget->card = bi;
budget->dev = (struct saa7146_dev *) dev;
+ if (budget->card->type == BUDGET_FS_ACTIVY) {
+ budget->buffer_width = TS_SIZE;
+ budget->buffer_height = TS_DEFAULT_HEIGHT * 2;
+ } else {
+ budget->buffer_width = TS_DEFAULT_WIDTH;
+ budget->buffer_height = TS_DEFAULT_HEIGHT;
+ }
+
+ if (budget_dma_buffer_size >= TS_MIN_BUFSIZE_K &&
+ budget_dma_buffer_size <= TS_MAX_BUFSIZE_K) {
+ int bufsize = budget_dma_buffer_size * 1024;
+
+ /*
+ For activy, don't change the buffer width at all,
+ since it must stay at TS_SIZE.
+ For all other cards, only change the width of the buffer
+ if the requested buffer size cannot be realized
+ by changing only the height of buffer.
+ */
+ if (bufsize / budget->buffer_width > TS_MAX_HEIGHT &&
+ budget->card->type != BUDGET_FS_ACTIVY) {
+ budget->buffer_width = budget_mod_limit(
+ bufsize/TS_MAX_HEIGHT, TS_MOD_WIDTH, TS_MAX_WIDTH);
+ }
+ budget->buffer_height = budget_mod_limit(
+ bufsize/budget->buffer_width, TS_MOD_HEIGHT, TS_MAX_HEIGHT);
+ }
+ budget->buffer_size = budget->buffer_height * budget->buffer_width;
+ budget->buffer_warnings = 0;
+ dprintk(2, "budget: width = %d, height = %d\n",
+ budget->buffer_width, budget->buffer_height);
dvb_register_adapter(&budget->dvb_adapter, budget->card->name, owner);
/* set dd1 stream a & b */
@@ -392,7 +447,7 @@
ttpci_eeprom_parse_mac(&budget->i2c_adap, budget->dvb_adapter.proposed_mac);
if (NULL ==
- (budget->grabbing = saa7146_vmalloc_build_pgtable(dev->pci, length, &budget->pt))) {
+ (budget->grabbing = saa7146_vmalloc_build_pgtable(dev->pci, budget->buffer_size, &budget->pt))) {
ret = -ENOMEM;
goto err;
}
diff -urw drivers/media/dvb/ttpci/budget.h /usr/src/linux-2.6.15.2/drivers/media/dvb/ttpci/budget.h
--- drivers/media/dvb/ttpci/budget.h 2005-12-27 01:26:33.000000000 +0100
+++ /usr/src/linux-2.6.15.2/drivers/media/dvb/ttpci/budget.h 2006-02-19 19:15:29.000000000 +0100
@@ -56,6 +56,10 @@
int ci_present;
int video_port;
+ int buffer_width;
+ int buffer_height;
+ int buffer_size;
+ int buffer_warnings;
u8 tsf;
u32 ttbp;
int feeding;
@@ -77,11 +81,6 @@
.ext_priv = &x_var ## _info, \
.ext = &budget_extension };
-#define TS_WIDTH (376)
-#define TS_HEIGHT (512)
-#define TS_BUFLEN (TS_WIDTH*TS_HEIGHT)
-#define TS_MAX_PACKETS (TS_BUFLEN/TS_SIZE)
-
#define BUDGET_TT 0
#define BUDGET_TT_HW_DISEQC 1
#define BUDGET_PATCH 3
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