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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2006-01-09 23:54:13 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-10 11:01:59 -0500
commit33f0f88f1c51ae5c2d593d26960c760ea154c2e2 (patch)
treef53a38cf49406863f079d74d0e8f91b276f7c1a9 /drivers/serial/m32r_sio.c
parent6ed80991a2dce4afc113be35089c564d62fa1f11 (diff)
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/serial/m32r_sio.c')
-rw-r--r--drivers/serial/m32r_sio.c31
1 files changed, 10 insertions, 21 deletions
diff --git a/drivers/serial/m32r_sio.c b/drivers/serial/m32r_sio.c
index b0ecc7537ce5..b48066a64a7d 100644
--- a/drivers/serial/m32r_sio.c
+++ b/drivers/serial/m32r_sio.c
@@ -331,17 +331,12 @@ static _INLINE_ void receive_chars(struct uart_sio_port *up, int *status,
331{ 331{
332 struct tty_struct *tty = up->port.info->tty; 332 struct tty_struct *tty = up->port.info->tty;
333 unsigned char ch; 333 unsigned char ch;
334 unsigned char flag;
334 int max_count = 256; 335 int max_count = 256;
335 336
336 do { 337 do {
337 if (unlikely(tty->flip.count >= TTY_FLIPBUF_SIZE)) {
338 tty->flip.work.func((void *)tty);
339 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
340 return; // if TTY_DONT_FLIP is set
341 }
342 ch = sio_in(up, SIORXB); 338 ch = sio_in(up, SIORXB);
343 *tty->flip.char_buf_ptr = ch; 339 flag = TTY_NORMAL;
344 *tty->flip.flag_buf_ptr = TTY_NORMAL;
345 up->port.icount.rx++; 340 up->port.icount.rx++;
346 341
347 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | 342 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
@@ -380,30 +375,24 @@ static _INLINE_ void receive_chars(struct uart_sio_port *up, int *status,
380 375
381 if (*status & UART_LSR_BI) { 376 if (*status & UART_LSR_BI) {
382 DEBUG_INTR("handling break...."); 377 DEBUG_INTR("handling break....");
383 *tty->flip.flag_buf_ptr = TTY_BREAK; 378 flag = TTY_BREAK;
384 } else if (*status & UART_LSR_PE) 379 } else if (*status & UART_LSR_PE)
385 *tty->flip.flag_buf_ptr = TTY_PARITY; 380 flag = TTY_PARITY;
386 else if (*status & UART_LSR_FE) 381 else if (*status & UART_LSR_FE)
387 *tty->flip.flag_buf_ptr = TTY_FRAME; 382 flag = TTY_FRAME;
388 } 383 }
389 if (uart_handle_sysrq_char(&up->port, ch, regs)) 384 if (uart_handle_sysrq_char(&up->port, ch, regs))
390 goto ignore_char; 385 goto ignore_char;
391 if ((*status & up->port.ignore_status_mask) == 0) { 386 if ((*status & up->port.ignore_status_mask) == 0)
392 tty->flip.flag_buf_ptr++; 387 tty_insert_flip_char(tty, ch, flag);
393 tty->flip.char_buf_ptr++; 388
394 tty->flip.count++; 389 if (*status & UART_LSR_OE) {
395 }
396 if ((*status & UART_LSR_OE) &&
397 tty->flip.count < TTY_FLIPBUF_SIZE) {
398 /* 390 /*
399 * Overrun is special, since it's reported 391 * Overrun is special, since it's reported
400 * immediately, and doesn't affect the current 392 * immediately, and doesn't affect the current
401 * character. 393 * character.
402 */ 394 */
403 *tty->flip.flag_buf_ptr = TTY_OVERRUN; 395 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
404 tty->flip.flag_buf_ptr++;
405 tty->flip.char_buf_ptr++;
406 tty->flip.count++;
407 } 396 }
408 ignore_char: 397 ignore_char:
409 *status = serial_in(up, UART_LSR); 398 *status = serial_in(up, UART_LSR);