litmus-rt.git - The LITMUS^RT kernel.

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author	Yinghai Lu <yinghai@kernel.org>	2015-01-15 17:21:49 -0500
committer	Bjorn Helgaas <bhelgaas@google.com>	2015-01-16 11:04:42 -0500
commit	b3e118224c011b885ef8331bd5b341f15b3bd69a (patch)
tree	081186ad1964806cff65f5ec5c7f91494e753f7d /net/unix/garbage.c
parent	851b09369255a91e77f56d83e3643439ac5b209a (diff)

alpha/PCI: Clip bridge windows to fit in upstream windows

Every PCI-PCI bridge window should fit inside an upstream bridge window because orphaned address space is unreachable from the primary side of the upstream bridge. If we inherit invalid bridge windows that overlap an upstream window from firmware, clip them to fit and update the bridge accordingly. [bhelgaas: changelog] Link: https://bugzilla.kernel.org/show_bug.cgi?id=85491 Reported-by: Marek Kordik <kordikmarek@gmail.com> Fixes: 5b28541552ef ("PCI: Restrict 64-bit prefetchable bridge windows to 64-bit resources") Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: Richard Henderson <rth@twiddle.net> CC: Ivan Kokshaysky <ink@jurassic.park.msu.ru> CC: Matt Turner <mattst88@gmail.com> CC: linux-alpha@vger.kernel.org

Diffstat (limited to 'net/unix/garbage.c')

0 files changed, 0 insertions, 0 deletions

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// SPDX-License-Identifier: GPL-2.0+ /* * TTY over Blackfin JTAG Communication * * Copyright 2008-2009 Analog Devices Inc. * * Enter bugs at http://blackfin.uclinux.org/ */ #define DRV_NAME "bfin-jtag-comm" #define DEV_NAME "ttyBFJC" #define pr_fmt(fmt) DRV_NAME ": " fmt #include <linux/circ_buf.h> #include <linux/console.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/kernel.h> #include <linux/kthread.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/tty.h> #include <linux/tty_driver.h> #include <linux/tty_flip.h> #include <linux/atomic.h> #define pr_init(fmt, args...) ({ static const __initconst char __fmt[] = fmt; printk(__fmt, ## args); }) /* See the Debug/Emulation chapter in the HRM */ #define EMUDOF 0x00000001 /* EMUDAT_OUT full & valid */ #define EMUDIF 0x00000002 /* EMUDAT_IN full & valid */ #define EMUDOOVF 0x00000004 /* EMUDAT_OUT overflow */ #define EMUDIOVF 0x00000008 /* EMUDAT_IN overflow */ static inline uint32_t bfin_write_emudat(uint32_t emudat) { __asm__ __volatile__("emudat = %0;" : : "d"(emudat)); return emudat; } static inline uint32_t bfin_read_emudat(void) { uint32_t emudat; __asm__ __volatile__("%0 = emudat;" : "=d"(emudat)); return emudat; } static inline uint32_t bfin_write_emudat_chars(char a, char b, char c, char d) { return bfin_write_emudat((a << 0) | (b << 8) | (c << 16) | (d << 24)); } #define CIRC_SIZE 2048 /* see comment in tty_io.c:do_tty_write() */ #define CIRC_MASK (CIRC_SIZE - 1) #define circ_empty(circ) ((circ)->head == (circ)->tail) #define circ_free(circ) CIRC_SPACE((circ)->head, (circ)->tail, CIRC_SIZE) #define circ_cnt(circ) CIRC_CNT((circ)->head, (circ)->tail, CIRC_SIZE) #define circ_byte(circ, idx) ((circ)->buf[(idx) & CIRC_MASK]) static struct tty_driver *bfin_jc_driver; static struct task_struct *bfin_jc_kthread; static struct tty_port port; static volatile struct circ_buf bfin_jc_write_buf; static int bfin_jc_emudat_manager(void *arg) { uint32_t inbound_len = 0, outbound_len = 0; while (!kthread_should_stop()) { struct tty_struct *tty = tty_port_tty_get(&port); /* no one left to give data to, so sleep */ if (tty == NULL && circ_empty(&bfin_jc_write_buf)) { pr_debug("waiting for readers\n"); __set_current_state(TASK_UNINTERRUPTIBLE); schedule(); continue; } /* no data available, so just chill */ if (!(bfin_read_DBGSTAT() & EMUDIF) && circ_empty(&bfin_jc_write_buf)) { pr_debug("waiting for data (in_len = %i) (circ: %i %i)\n", inbound_len, bfin_jc_write_buf.tail, bfin_jc_write_buf.head); tty_kref_put(tty); if (inbound_len) schedule(); else schedule_timeout_interruptible(HZ); continue; } /* if incoming data is ready, eat it */ if (bfin_read_DBGSTAT() & EMUDIF) { uint32_t emudat = bfin_read_emudat(); if (inbound_len == 0) { pr_debug("incoming length: 0x%08x\n", emudat); inbound_len = emudat; } else { size_t num_chars = (4 <= inbound_len ? 4 : inbound_len); pr_debug(" incoming data: 0x%08x (pushing %zu)\n", emudat, num_chars); inbound_len -= num_chars; tty_insert_flip_string(&port, (unsigned char *)&emudat, num_chars); tty_flip_buffer_push(&port); } } /* if outgoing data is ready, post it */ if (!(bfin_read_DBGSTAT() & EMUDOF) && !circ_empty(&bfin_jc_write_buf)) { if (outbound_len == 0) { outbound_len = circ_cnt(&bfin_jc_write_buf); bfin_write_emudat(outbound_len); pr_debug("outgoing length: 0x%08x\n", outbound_len); } else { int tail = bfin_jc_write_buf.tail; size_t ate = (4 <= outbound_len ? 4 : outbound_len); uint32_t emudat = bfin_write_emudat_chars( circ_byte(&bfin_jc_write_buf, tail + 0), circ_byte(&bfin_jc_write_buf, tail + 1), circ_byte(&bfin_jc_write_buf, tail + 2), circ_byte(&bfin_jc_write_buf, tail + 3) ); bfin_jc_write_buf.tail += ate; outbound_len -= ate; if (tty) tty_wakeup(tty); pr_debug(" outgoing data: 0x%08x (pushing %zu)\n", emudat, ate); } } tty_kref_put(tty); } __set_current_state(TASK_RUNNING); return 0; } static int bfin_jc_open(struct tty_struct *tty, struct file *filp) { unsigned long flags; spin_lock_irqsave(&port.lock, flags); port.count++; spin_unlock_irqrestore(&port.lock, flags); tty_port_tty_set(&port, tty); wake_up_process(bfin_jc_kthread); return 0; } static void bfin_jc_close(struct tty_struct *tty, struct file *filp) { unsigned long flags; bool last; spin_lock_irqsave(&port.lock, flags); last = --port.count == 0; spin_unlock_irqrestore(&port.lock, flags); if (last) tty_port_tty_set(&port, NULL); wake_up_process(bfin_jc_kthread); } /* XXX: we dont handle the put_char() case where we must handle count = 1 */ static int bfin_jc_circ_write(const unsigned char *buf, int count) { int i; count = min(count, circ_free(&bfin_jc_write_buf)); pr_debug("going to write chunk of %i bytes\n", count); for (i = 0; i < count; ++i) circ_byte(&bfin_jc_write_buf, bfin_jc_write_buf.head + i) = buf[i]; bfin_jc_write_buf.head += i; return i; } #ifndef CONFIG_BFIN_JTAG_COMM_CONSOLE # define console_lock() # define console_unlock() #endif static int bfin_jc_write(struct tty_struct *tty, const unsigned char *buf, int count) { int i; console_lock(); i = bfin_jc_circ_write(buf, count); console_unlock(); wake_up_process(bfin_jc_kthread); return i; } static void bfin_jc_flush_chars(struct tty_struct *tty) { wake_up_process(bfin_jc_kthread); } static int bfin_jc_write_room(struct tty_struct *tty) { return circ_free(&bfin_jc_write_buf); } static int bfin_jc_chars_in_buffer(struct tty_struct *tty) { return circ_cnt(&bfin_jc_write_buf); } static const struct tty_operations bfin_jc_ops = { .open = bfin_jc_open, .close = bfin_jc_close, .write = bfin_jc_write, /*.put_char = bfin_jc_put_char,*/ .flush_chars = bfin_jc_flush_chars, .write_room = bfin_jc_write_room, .chars_in_buffer = bfin_jc_chars_in_buffer, }; static int __init bfin_jc_init(void) { int ret; bfin_jc_kthread = kthread_create(bfin_jc_emudat_manager, NULL, DRV_NAME); if (IS_ERR(bfin_jc_kthread)) return PTR_ERR(bfin_jc_kthread); ret = -ENOMEM; bfin_jc_write_buf.head = bfin_jc_write_buf.tail = 0; bfin_jc_write_buf.buf = kmalloc(CIRC_SIZE, GFP_KERNEL); if (!bfin_jc_write_buf.buf) goto err_buf; bfin_jc_driver = alloc_tty_driver(1); if (!bfin_jc_driver) goto err_driver; tty_port_init(&port); bfin_jc_driver->driver_name = DRV_NAME; bfin_jc_driver->name = DEV_NAME; bfin_jc_driver->type = TTY_DRIVER_TYPE_SERIAL; bfin_jc_driver->subtype = SERIAL_TYPE_NORMAL; bfin_jc_driver->init_termios = tty_std_termios; tty_set_operations(bfin_jc_driver, &bfin_jc_ops); tty_port_link_device(&port, bfin_jc_driver, 0); ret = tty_register_driver(bfin_jc_driver); if (ret) goto err; pr_init(KERN_INFO DRV_NAME ": initialized\n"); return 0; err: tty_port_destroy(&port); put_tty_driver(bfin_jc_driver); err_driver: kfree(bfin_jc_write_buf.buf); err_buf: kthread_stop(bfin_jc_kthread); return ret; } module_init(bfin_jc_init); static void __exit bfin_jc_exit(void) { kthread_stop(bfin_jc_kthread); kfree(bfin_jc_write_buf.buf); tty_unregister_driver(bfin_jc_driver); put_tty_driver(bfin_jc_driver); tty_port_destroy(&port); } module_exit(bfin_jc_exit); #if defined(CONFIG_BFIN_JTAG_COMM_CONSOLE) || defined(CONFIG_EARLY_PRINTK) static void bfin_jc_straight_buffer_write(const char *buf, unsigned count) { unsigned ate = 0; while (bfin_read_DBGSTAT() & EMUDOF) continue; bfin_write_emudat(count); while (ate < count) { while (bfin_read_DBGSTAT() & EMUDOF) continue; bfin_write_emudat_chars(buf[ate], buf[ate+1], buf[ate+2], buf[ate+3]); ate += 4; } } #endif #ifdef CONFIG_BFIN_JTAG_COMM_CONSOLE static void bfin_jc_console_write(struct console *co, const char *buf, unsigned count) { if (bfin_jc_kthread == NULL) bfin_jc_straight_buffer_write(buf, count); else bfin_jc_circ_write(buf, count); } static struct tty_driver * bfin_jc_console_device(struct console *co, int *index) { *index = co->index; return bfin_jc_driver; } static struct console bfin_jc_console = { .name = DEV_NAME, .write = bfin_jc_console_write, .device = bfin_jc_console_device, .flags = CON_ANYTIME | CON_PRINTBUFFER, .index = -1, }; static int __init bfin_jc_console_init(void) { register_console(&bfin_jc_console); return 0; } console_initcall(bfin_jc_console_init); #endif #ifdef CONFIG_EARLY_PRINTK static void __init bfin_jc_early_write(struct console *co, const char *buf, unsigned int count) { bfin_jc_straight_buffer_write(buf, count); } static struct console bfin_jc_early_console __initdata = { .name = "early_BFJC", .write = bfin_jc_early_write, .flags = CON_ANYTIME | CON_PRINTBUFFER, .index = -1, }; struct console * __init bfin_jc_early_init(unsigned int port, unsigned int cflag) { return &bfin_jc_early_console; } #endif MODULE_AUTHOR("Mike Frysinger <vapier@gentoo.org>"); MODULE_DESCRIPTION("TTY over Blackfin JTAG Communication"); MODULE_LICENSE("GPL");


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