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![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
482 lines
10 KiB
C
482 lines
10 KiB
C
/*
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* sound/oss/uart401.c
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*
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* MPU-401 UART driver (formerly uart401_midi.c)
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*
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*
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* Copyright (C) by Hannu Savolainen 1993-1997
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*
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* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
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* Version 2 (June 1991). See the "COPYING" file distributed with this software
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* for more info.
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*
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* Changes:
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* Alan Cox Reformatted, removed sound_mem usage, use normal Linux
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* interrupt allocation. Protect against bogus unload
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* Fixed to allow IRQ > 15
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* Christoph Hellwig Adapted to module_init/module_exit
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* Arnaldo C. de Melo got rid of check_region
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*
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* Status:
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* Untested
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*/
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include "sound_config.h"
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#include "mpu401.h"
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typedef struct uart401_devc
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{
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int base;
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int irq;
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int *osp;
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void (*midi_input_intr) (int dev, unsigned char data);
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int opened, disabled;
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volatile unsigned char input_byte;
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int my_dev;
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int share_irq;
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spinlock_t lock;
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}
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uart401_devc;
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#define DATAPORT (devc->base)
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#define COMDPORT (devc->base+1)
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#define STATPORT (devc->base+1)
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static int uart401_status(uart401_devc * devc)
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{
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return inb(STATPORT);
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}
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#define input_avail(devc) (!(uart401_status(devc)&INPUT_AVAIL))
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#define output_ready(devc) (!(uart401_status(devc)&OUTPUT_READY))
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static void uart401_cmd(uart401_devc * devc, unsigned char cmd)
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{
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outb((cmd), COMDPORT);
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}
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static int uart401_read(uart401_devc * devc)
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{
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return inb(DATAPORT);
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}
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static void uart401_write(uart401_devc * devc, unsigned char byte)
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{
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outb((byte), DATAPORT);
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}
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#define OUTPUT_READY 0x40
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#define INPUT_AVAIL 0x80
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#define MPU_ACK 0xFE
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#define MPU_RESET 0xFF
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#define UART_MODE_ON 0x3F
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static int reset_uart401(uart401_devc * devc);
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static void enter_uart_mode(uart401_devc * devc);
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static void uart401_input_loop(uart401_devc * devc)
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{
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int work_limit=30000;
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while (input_avail(devc) && --work_limit)
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{
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unsigned char c = uart401_read(devc);
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if (c == MPU_ACK)
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devc->input_byte = c;
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else if (devc->opened & OPEN_READ && devc->midi_input_intr)
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devc->midi_input_intr(devc->my_dev, c);
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}
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if(work_limit==0)
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printk(KERN_WARNING "Too much work in interrupt on uart401 (0x%X). UART jabbering ??\n", devc->base);
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}
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irqreturn_t uart401intr(int irq, void *dev_id)
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{
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uart401_devc *devc = dev_id;
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if (devc == NULL)
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{
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printk(KERN_ERR "uart401: bad devc\n");
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return IRQ_NONE;
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}
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if (input_avail(devc))
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uart401_input_loop(devc);
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return IRQ_HANDLED;
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}
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static int
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uart401_open(int dev, int mode,
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void (*input) (int dev, unsigned char data),
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void (*output) (int dev)
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)
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{
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uart401_devc *devc = (uart401_devc *) midi_devs[dev]->devc;
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if (devc->opened)
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return -EBUSY;
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/* Flush the UART */
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while (input_avail(devc))
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uart401_read(devc);
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devc->midi_input_intr = input;
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devc->opened = mode;
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enter_uart_mode(devc);
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devc->disabled = 0;
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return 0;
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}
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static void uart401_close(int dev)
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{
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uart401_devc *devc = (uart401_devc *) midi_devs[dev]->devc;
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reset_uart401(devc);
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devc->opened = 0;
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}
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static int uart401_out(int dev, unsigned char midi_byte)
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{
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int timeout;
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unsigned long flags;
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uart401_devc *devc = (uart401_devc *) midi_devs[dev]->devc;
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if (devc->disabled)
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return 1;
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/*
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* Test for input since pending input seems to block the output.
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*/
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spin_lock_irqsave(&devc->lock,flags);
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if (input_avail(devc))
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uart401_input_loop(devc);
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spin_unlock_irqrestore(&devc->lock,flags);
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/*
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* Sometimes it takes about 13000 loops before the output becomes ready
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* (After reset). Normally it takes just about 10 loops.
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*/
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for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);
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if (!output_ready(devc))
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{
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printk(KERN_WARNING "uart401: Timeout - Device not responding\n");
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devc->disabled = 1;
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reset_uart401(devc);
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enter_uart_mode(devc);
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return 1;
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}
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uart401_write(devc, midi_byte);
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return 1;
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}
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static inline int uart401_start_read(int dev)
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{
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return 0;
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}
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static inline int uart401_end_read(int dev)
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{
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return 0;
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}
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static inline void uart401_kick(int dev)
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{
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}
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static inline int uart401_buffer_status(int dev)
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{
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return 0;
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}
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#define MIDI_SYNTH_NAME "MPU-401 UART"
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#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
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#include "midi_synth.h"
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static const struct midi_operations uart401_operations =
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{
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.owner = THIS_MODULE,
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.info = {"MPU-401 (UART) MIDI", 0, 0, SNDCARD_MPU401},
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.converter = &std_midi_synth,
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.in_info = {0},
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.open = uart401_open,
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.close = uart401_close,
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.outputc = uart401_out,
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.start_read = uart401_start_read,
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.end_read = uart401_end_read,
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.kick = uart401_kick,
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.buffer_status = uart401_buffer_status,
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};
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static void enter_uart_mode(uart401_devc * devc)
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{
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int ok, timeout;
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unsigned long flags;
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spin_lock_irqsave(&devc->lock,flags);
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for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);
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devc->input_byte = 0;
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uart401_cmd(devc, UART_MODE_ON);
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ok = 0;
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for (timeout = 50000; timeout > 0 && !ok; timeout--)
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if (devc->input_byte == MPU_ACK)
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ok = 1;
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else if (input_avail(devc))
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if (uart401_read(devc) == MPU_ACK)
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ok = 1;
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spin_unlock_irqrestore(&devc->lock,flags);
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}
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static int reset_uart401(uart401_devc * devc)
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{
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int ok, timeout, n;
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/*
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* Send the RESET command. Try again if no success at the first time.
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*/
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ok = 0;
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for (n = 0; n < 2 && !ok; n++)
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{
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for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);
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devc->input_byte = 0;
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uart401_cmd(devc, MPU_RESET);
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/*
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* Wait at least 25 msec. This method is not accurate so let's make the
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* loop bit longer. Cannot sleep since this is called during boot.
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*/
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for (timeout = 50000; timeout > 0 && !ok; timeout--)
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{
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if (devc->input_byte == MPU_ACK) /* Interrupt */
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ok = 1;
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else if (input_avail(devc))
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{
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if (uart401_read(devc) == MPU_ACK)
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ok = 1;
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}
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}
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}
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if (ok)
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{
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DEB(printk("Reset UART401 OK\n"));
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}
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else
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DDB(printk("Reset UART401 failed - No hardware detected.\n"));
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if (ok)
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uart401_input_loop(devc); /*
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* Flush input before enabling interrupts
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*/
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return ok;
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}
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int probe_uart401(struct address_info *hw_config, struct module *owner)
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{
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uart401_devc *devc;
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char *name = "MPU-401 (UART) MIDI";
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int ok = 0;
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unsigned long flags;
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DDB(printk("Entered probe_uart401()\n"));
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/* Default to "not found" */
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hw_config->slots[4] = -1;
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if (!request_region(hw_config->io_base, 4, "MPU-401 UART")) {
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printk(KERN_INFO "uart401: could not request_region(%d, 4)\n", hw_config->io_base);
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return 0;
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}
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devc = kmalloc(sizeof(uart401_devc), GFP_KERNEL);
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if (!devc) {
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printk(KERN_WARNING "uart401: Can't allocate memory\n");
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goto cleanup_region;
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}
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devc->base = hw_config->io_base;
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devc->irq = hw_config->irq;
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devc->osp = hw_config->osp;
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devc->midi_input_intr = NULL;
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devc->opened = 0;
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devc->input_byte = 0;
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devc->my_dev = 0;
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devc->share_irq = 0;
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spin_lock_init(&devc->lock);
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spin_lock_irqsave(&devc->lock,flags);
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ok = reset_uart401(devc);
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spin_unlock_irqrestore(&devc->lock,flags);
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if (!ok)
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goto cleanup_devc;
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if (hw_config->name)
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name = hw_config->name;
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if (devc->irq < 0) {
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devc->share_irq = 1;
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devc->irq *= -1;
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} else
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devc->share_irq = 0;
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if (!devc->share_irq)
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if (request_irq(devc->irq, uart401intr, 0, "MPU-401 UART", devc) < 0) {
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printk(KERN_WARNING "uart401: Failed to allocate IRQ%d\n", devc->irq);
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devc->share_irq = 1;
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}
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devc->my_dev = sound_alloc_mididev();
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enter_uart_mode(devc);
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if (devc->my_dev == -1) {
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printk(KERN_INFO "uart401: Too many midi devices detected\n");
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goto cleanup_irq;
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}
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conf_printf(name, hw_config);
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midi_devs[devc->my_dev] = kmalloc(sizeof(struct midi_operations), GFP_KERNEL);
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if (!midi_devs[devc->my_dev]) {
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printk(KERN_ERR "uart401: Failed to allocate memory\n");
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goto cleanup_unload_mididev;
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}
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memcpy(midi_devs[devc->my_dev], &uart401_operations, sizeof(struct midi_operations));
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if (owner)
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midi_devs[devc->my_dev]->owner = owner;
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midi_devs[devc->my_dev]->devc = devc;
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midi_devs[devc->my_dev]->converter = kmalloc(sizeof(struct synth_operations), GFP_KERNEL);
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if (!midi_devs[devc->my_dev]->converter) {
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printk(KERN_WARNING "uart401: Failed to allocate memory\n");
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goto cleanup_midi_devs;
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}
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memcpy(midi_devs[devc->my_dev]->converter, &std_midi_synth, sizeof(struct synth_operations));
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strcpy(midi_devs[devc->my_dev]->info.name, name);
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midi_devs[devc->my_dev]->converter->id = "UART401";
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midi_devs[devc->my_dev]->converter->midi_dev = devc->my_dev;
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if (owner)
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midi_devs[devc->my_dev]->converter->owner = owner;
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hw_config->slots[4] = devc->my_dev;
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sequencer_init();
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devc->opened = 0;
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return 1;
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cleanup_midi_devs:
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kfree(midi_devs[devc->my_dev]);
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cleanup_unload_mididev:
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sound_unload_mididev(devc->my_dev);
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cleanup_irq:
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if (!devc->share_irq)
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free_irq(devc->irq, devc);
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cleanup_devc:
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kfree(devc);
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cleanup_region:
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release_region(hw_config->io_base, 4);
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return 0;
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}
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void unload_uart401(struct address_info *hw_config)
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{
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uart401_devc *devc;
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int n=hw_config->slots[4];
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/* Not set up */
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if(n==-1 || midi_devs[n]==NULL)
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return;
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/* Not allocated (erm ??) */
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devc = midi_devs[hw_config->slots[4]]->devc;
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if (devc == NULL)
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return;
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reset_uart401(devc);
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release_region(hw_config->io_base, 4);
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if (!devc->share_irq)
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free_irq(devc->irq, devc);
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if (devc)
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{
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kfree(midi_devs[devc->my_dev]->converter);
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kfree(midi_devs[devc->my_dev]);
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kfree(devc);
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devc = NULL;
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}
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/* This kills midi_devs[x] */
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sound_unload_mididev(hw_config->slots[4]);
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}
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EXPORT_SYMBOL(probe_uart401);
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EXPORT_SYMBOL(unload_uart401);
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EXPORT_SYMBOL(uart401intr);
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static struct address_info cfg_mpu;
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static int io = -1;
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static int irq = -1;
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module_param(io, int, 0444);
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module_param(irq, int, 0444);
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static int __init init_uart401(void)
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{
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cfg_mpu.irq = irq;
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cfg_mpu.io_base = io;
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/* Can be loaded either for module use or to provide functions
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to others */
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if (cfg_mpu.io_base != -1 && cfg_mpu.irq != -1) {
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printk(KERN_INFO "MPU-401 UART driver Copyright (C) Hannu Savolainen 1993-1997");
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if (!probe_uart401(&cfg_mpu, THIS_MODULE))
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return -ENODEV;
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}
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return 0;
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}
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static void __exit cleanup_uart401(void)
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{
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if (cfg_mpu.io_base != -1 && cfg_mpu.irq != -1)
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unload_uart401(&cfg_mpu);
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}
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module_init(init_uart401);
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module_exit(cleanup_uart401);
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#ifndef MODULE
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static int __init setup_uart401(char *str)
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{
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/* io, irq */
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int ints[3];
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str = get_options(str, ARRAY_SIZE(ints), ints);
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io = ints[1];
|
|
irq = ints[2];
|
|
|
|
return 1;
|
|
}
|
|
|
|
__setup("uart401=", setup_uart401);
|
|
#endif
|
|
MODULE_LICENSE("GPL");
|