diff options
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/agp/amd64-agp.c | 9 | ||||
| -rw-r--r-- | drivers/char/agp/intel-agp.h | 1 | ||||
| -rw-r--r-- | drivers/char/agp/intel-gtt.c | 56 | ||||
| -rw-r--r-- | drivers/char/hw_random/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/char/hw_random/Makefile | 1 | ||||
| -rw-r--r-- | drivers/char/hw_random/omap-rng.c | 14 | ||||
| -rw-r--r-- | drivers/char/hw_random/picoxcell-rng.c | 208 | ||||
| -rw-r--r-- | drivers/char/ipmi/ipmi_si_intf.c | 8 | ||||
| -rw-r--r-- | drivers/char/mmtimer.c | 30 | ||||
| -rw-r--r-- | drivers/char/pcmcia/cm4000_cs.c | 3 | ||||
| -rw-r--r-- | drivers/char/random.c | 13 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm.c | 10 | ||||
| -rw-r--r-- | drivers/char/virtio_console.c | 8 |
13 files changed, 306 insertions, 67 deletions
diff --git a/drivers/char/agp/amd64-agp.c b/drivers/char/agp/amd64-agp.c index 9252e85..780498d 100644 --- a/drivers/char/agp/amd64-agp.c +++ b/drivers/char/agp/amd64-agp.c @@ -773,18 +773,23 @@ int __init agp_amd64_init(void) #else printk(KERN_INFO PFX "You can boot with agp=try_unsupported\n"); #endif + pci_unregister_driver(&agp_amd64_pci_driver); return -ENODEV; } /* First check that we have at least one AMD64 NB */ - if (!pci_dev_present(amd_nb_misc_ids)) + if (!pci_dev_present(amd_nb_misc_ids)) { + pci_unregister_driver(&agp_amd64_pci_driver); return -ENODEV; + } /* Look for any AGP bridge */ agp_amd64_pci_driver.id_table = agp_amd64_pci_promisc_table; err = driver_attach(&agp_amd64_pci_driver.driver); - if (err == 0 && agp_bridges_found == 0) + if (err == 0 && agp_bridges_found == 0) { + pci_unregister_driver(&agp_amd64_pci_driver); err = -ENODEV; + } } return err; } diff --git a/drivers/char/agp/intel-agp.h b/drivers/char/agp/intel-agp.h index c195bfe..5feebe2 100644 --- a/drivers/char/agp/intel-agp.h +++ b/drivers/char/agp/intel-agp.h @@ -130,6 +130,7 @@ #define INTEL_GMCH_GMS_STOLEN_352M (0xd << 4) #define I915_IFPADDR 0x60 +#define I830_HIC 0x70 /* Intel 965G registers */ #define I965_MSAC 0x62 diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c index fab3d32..0d09b53 100644 --- a/drivers/char/agp/intel-gtt.c +++ b/drivers/char/agp/intel-gtt.c @@ -21,6 +21,7 @@ #include <linux/kernel.h> #include <linux/pagemap.h> #include <linux/agp_backend.h> +#include <linux/delay.h> #include <asm/smp.h> #include "agp.h" #include "intel-agp.h" @@ -70,12 +71,8 @@ static struct _intel_private { u32 __iomem *gtt; /* I915G */ bool clear_fake_agp; /* on first access via agp, fill with scratch */ int num_dcache_entries; - union { - void __iomem *i9xx_flush_page; - void *i8xx_flush_page; - }; + void __iomem *i9xx_flush_page; char *i81x_gtt_table; - struct page *i8xx_page; struct resource ifp_resource; int resource_valid; struct page *scratch_page; @@ -722,28 +719,6 @@ static int intel_fake_agp_fetch_size(void) static void i830_cleanup(void) { - if (intel_private.i8xx_flush_page) { - kunmap(intel_private.i8xx_flush_page); - intel_private.i8xx_flush_page = NULL; - } - - __free_page(intel_private.i8xx_page); - intel_private.i8xx_page = NULL; -} - -static void intel_i830_setup_flush(void) -{ - /* return if we've already set the flush mechanism up */ - if (intel_private.i8xx_page) - return; - - intel_private.i8xx_page = alloc_page(GFP_KERNEL); - if (!intel_private.i8xx_page) - return; - - intel_private.i8xx_flush_page = kmap(intel_private.i8xx_page); - if (!intel_private.i8xx_flush_page) - i830_cleanup(); } /* The chipset_flush interface needs to get data that has already been @@ -758,14 +733,27 @@ static void intel_i830_setup_flush(void) */ static void i830_chipset_flush(void) { - unsigned int *pg = intel_private.i8xx_flush_page; + unsigned long timeout = jiffies + msecs_to_jiffies(1000); + + /* Forcibly evict everything from the CPU write buffers. + * clflush appears to be insufficient. + */ + wbinvd_on_all_cpus(); + + /* Now we've only seen documents for this magic bit on 855GM, + * we hope it exists for the other gen2 chipsets... + * + * Also works as advertised on my 845G. + */ + writel(readl(intel_private.registers+I830_HIC) | (1<<31), + intel_private.registers+I830_HIC); - memset(pg, 0, 1024); + while (readl(intel_private.registers+I830_HIC) & (1<<31)) { + if (time_after(jiffies, timeout)) + break; - if (cpu_has_clflush) - clflush_cache_range(pg, 1024); - else if (wbinvd_on_all_cpus() != 0) - printk(KERN_ERR "Timed out waiting for cache flush.\n"); + udelay(50); + } } static void i830_write_entry(dma_addr_t addr, unsigned int entry, @@ -849,8 +837,6 @@ static int i830_setup(void) intel_private.gtt_bus_addr = reg_addr + I810_PTE_BASE; - intel_i830_setup_flush(); - return 0; } diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index d31483c..beecd1c 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -198,3 +198,15 @@ config HW_RANDOM_NOMADIK module will be called nomadik-rng. If unsure, say Y. + +config HW_RANDOM_PICOXCELL + tristate "Picochip picoXcell true random number generator support" + depends on HW_RANDOM && ARCH_PICOXCELL && PICOXCELL_PC3X3 + ---help--- + This driver provides kernel-side support for the Random Number + Generator hardware found on Picochip PC3x3 and later devices. + + To compile this driver as a module, choose M here: the + module will be called picoxcell-rng. + + If unsure, say Y. diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index 4273308..3db4eb8 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -19,3 +19,4 @@ obj-$(CONFIG_HW_RANDOM_TX4939) += tx4939-rng.o obj-$(CONFIG_HW_RANDOM_MXC_RNGA) += mxc-rnga.o obj-$(CONFIG_HW_RANDOM_OCTEON) += octeon-rng.o obj-$(CONFIG_HW_RANDOM_NOMADIK) += nomadik-rng.o +obj-$(CONFIG_HW_RANDOM_PICOXCELL) += picoxcell-rng.o diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c index 06aad08..2cc755a 100644 --- a/drivers/char/hw_random/omap-rng.c +++ b/drivers/char/hw_random/omap-rng.c @@ -91,7 +91,7 @@ static struct hwrng omap_rng_ops = { static int __devinit omap_rng_probe(struct platform_device *pdev) { - struct resource *res, *mem; + struct resource *res; int ret; /* @@ -116,14 +116,12 @@ static int __devinit omap_rng_probe(struct platform_device *pdev) if (!res) return -ENOENT; - mem = request_mem_region(res->start, resource_size(res), - pdev->name); - if (mem == NULL) { + if (!request_mem_region(res->start, resource_size(res), pdev->name)) { ret = -EBUSY; goto err_region; } - dev_set_drvdata(&pdev->dev, mem); + dev_set_drvdata(&pdev->dev, res); rng_base = ioremap(res->start, resource_size(res)); if (!rng_base) { ret = -ENOMEM; @@ -146,7 +144,7 @@ err_register: iounmap(rng_base); rng_base = NULL; err_ioremap: - release_resource(mem); + release_mem_region(res->start, resource_size(res)); err_region: if (cpu_is_omap24xx()) { clk_disable(rng_ick); @@ -157,7 +155,7 @@ err_region: static int __exit omap_rng_remove(struct platform_device *pdev) { - struct resource *mem = dev_get_drvdata(&pdev->dev); + struct resource *res = dev_get_drvdata(&pdev->dev); hwrng_unregister(&omap_rng_ops); @@ -170,7 +168,7 @@ static int __exit omap_rng_remove(struct platform_device *pdev) clk_put(rng_ick); } - release_resource(mem); + release_mem_region(res->start, resource_size(res)); rng_base = NULL; return 0; diff --git a/drivers/char/hw_random/picoxcell-rng.c b/drivers/char/hw_random/picoxcell-rng.c new file mode 100644 index 0000000..990d55a --- /dev/null +++ b/drivers/char/hw_random/picoxcell-rng.c @@ -0,0 +1,208 @@ +/* + * Copyright (c) 2010-2011 Picochip Ltd., Jamie Iles + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * All enquiries to support@picochip.com + */ +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/hw_random.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> + +#define DATA_REG_OFFSET 0x0200 +#define CSR_REG_OFFSET 0x0278 +#define CSR_OUT_EMPTY_MASK (1 << 24) +#define CSR_FAULT_MASK (1 << 1) +#define TRNG_BLOCK_RESET_MASK (1 << 0) +#define TAI_REG_OFFSET 0x0380 + +/* + * The maximum amount of time in microseconds to spend waiting for data if the + * core wants us to wait. The TRNG should generate 32 bits every 320ns so a + * timeout of 20us seems reasonable. The TRNG does builtin tests of the data + * for randomness so we can't always assume there is data present. + */ +#define PICO_TRNG_TIMEOUT 20 + +static void __iomem *rng_base; +static struct clk *rng_clk; +struct device *rng_dev; + +static inline u32 picoxcell_trng_read_csr(void) +{ + return __raw_readl(rng_base + CSR_REG_OFFSET); +} + +static inline bool picoxcell_trng_is_empty(void) +{ + return picoxcell_trng_read_csr() & CSR_OUT_EMPTY_MASK; +} + +/* + * Take the random number generator out of reset and make sure the interrupts + * are masked. We shouldn't need to get large amounts of random bytes so just + * poll the status register. The hardware generates 32 bits every 320ns so we + * shouldn't have to wait long enough to warrant waiting for an IRQ. + */ +static void picoxcell_trng_start(void) +{ + __raw_writel(0, rng_base + TAI_REG_OFFSET); + __raw_writel(0, rng_base + CSR_REG_OFFSET); +} + +static void picoxcell_trng_reset(void) +{ + __raw_writel(TRNG_BLOCK_RESET_MASK, rng_base + CSR_REG_OFFSET); + __raw_writel(TRNG_BLOCK_RESET_MASK, rng_base + TAI_REG_OFFSET); + picoxcell_trng_start(); +} + +/* + * Get some random data from the random number generator. The hw_random core + * layer provides us with locking. + */ +static int picoxcell_trng_read(struct hwrng *rng, void *buf, size_t max, + bool wait) +{ + int i; + + /* Wait for some data to become available. */ + for (i = 0; i < PICO_TRNG_TIMEOUT && picoxcell_trng_is_empty(); ++i) { + if (!wait) + return 0; + + udelay(1); + } + + if (picoxcell_trng_read_csr() & CSR_FAULT_MASK) { + dev_err(rng_dev, "fault detected, resetting TRNG\n"); + picoxcell_trng_reset(); + return -EIO; + } + + if (i == PICO_TRNG_TIMEOUT) + return 0; + + *(u32 *)buf = __raw_readl(rng_base + DATA_REG_OFFSET); + return sizeof(u32); +} + +static struct hwrng picoxcell_trng = { + .name = "picoxcell", + .read = picoxcell_trng_read, +}; + +static int picoxcell_trng_probe(struct platform_device *pdev) +{ + int ret; + struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + if (!mem) { + dev_warn(&pdev->dev, "no memory resource\n"); + return -ENOMEM; + } + + if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem), + "picoxcell_trng")) { + dev_warn(&pdev->dev, "unable to request io mem\n"); + return -EBUSY; + } + + rng_base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem)); + if (!rng_base) { + dev_warn(&pdev->dev, "unable to remap io mem\n"); + return -ENOMEM; + } + + rng_clk = clk_get(&pdev->dev, NULL); + if (IS_ERR(rng_clk)) { + dev_warn(&pdev->dev, "no clk\n"); + return PTR_ERR(rng_clk); + } + + ret = clk_enable(rng_clk); + if (ret) { + dev_warn(&pdev->dev, "unable to enable clk\n"); + goto err_enable; + } + + picoxcell_trng_start(); + ret = hwrng_register(&picoxcell_trng); + if (ret) + goto err_register; + + rng_dev = &pdev->dev; + dev_info(&pdev->dev, "pixoxcell random number generator active\n"); + + return 0; + +err_register: + clk_disable(rng_clk); +err_enable: + clk_put(rng_clk); + + return ret; +} + +static int __devexit picoxcell_trng_remove(struct platform_device *pdev) +{ + hwrng_unregister(&picoxcell_trng); + clk_disable(rng_clk); + clk_put(rng_clk); + + return 0; +} + +#ifdef CONFIG_PM +static int picoxcell_trng_suspend(struct device *dev) +{ + clk_disable(rng_clk); + + return 0; +} + +static int picoxcell_trng_resume(struct device *dev) +{ + return clk_enable(rng_clk); +} + +static const struct dev_pm_ops picoxcell_trng_pm_ops = { + .suspend = picoxcell_trng_suspend, + .resume = picoxcell_trng_resume, +}; +#endif /* CONFIG_PM */ + +static struct platform_driver picoxcell_trng_driver = { + .probe = picoxcell_trng_probe, + .remove = __devexit_p(picoxcell_trng_remove), + .driver = { + .name = "picoxcell-trng", + .owner = THIS_MODULE, +#ifdef CONFIG_PM + .pm = &picoxcell_trng_pm_ops, +#endif /* CONFIG_PM */ + }, +}; + +static int __init picoxcell_trng_init(void) +{ + return platform_driver_register(&picoxcell_trng_driver); +} +module_init(picoxcell_trng_init); + +static void __exit picoxcell_trng_exit(void) +{ + platform_driver_unregister(&picoxcell_trng_driver); +} +module_exit(picoxcell_trng_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Jamie Iles"); +MODULE_DESCRIPTION("Picochip picoXcell TRNG driver"); diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c index 7855f9f..62787e3 100644 --- a/drivers/char/ipmi/ipmi_si_intf.c +++ b/drivers/char/ipmi/ipmi_si_intf.c @@ -900,6 +900,14 @@ static void sender(void *send_info, printk("**Enqueue: %d.%9.9d\n", t.tv_sec, t.tv_usec); #endif + /* + * last_timeout_jiffies is updated here to avoid + * smi_timeout() handler passing very large time_diff + * value to smi_event_handler() that causes + * the send command to abort. + */ + smi_info->last_timeout_jiffies = jiffies; + mod_timer(&smi_info->si_timer, jiffies + SI_TIMEOUT_JIFFIES); if (smi_info->thread) diff --git a/drivers/char/mmtimer.c b/drivers/char/mmtimer.c index e6d7562..33dc229 100644 --- a/drivers/char/mmtimer.c +++ b/drivers/char/mmtimer.c @@ -53,6 +53,8 @@ MODULE_LICENSE("GPL"); #define RTC_BITS 55 /* 55 bits for this implementation */ +static struct k_clock sgi_clock; + extern unsigned long sn_rtc_cycles_per_second; #define RTC_COUNTER_ADDR ((long *)LOCAL_MMR_ADDR(SH_RTC)) @@ -487,7 +489,7 @@ static int sgi_clock_get(clockid_t clockid, struct timespec *tp) return 0; }; -static int sgi_clock_set(clockid_t clockid, struct timespec *tp) +static int sgi_clock_set(const clockid_t clockid, const struct timespec *tp) { u64 nsec; @@ -763,15 +765,21 @@ static int sgi_timer_set(struct k_itimer *timr, int flags, return err; } +static int sgi_clock_getres(const clockid_t which_clock, struct timespec *tp) +{ + tp->tv_sec = 0; + tp->tv_nsec = sgi_clock_period; + return 0; +} + static struct k_clock sgi_clock = { - .res = 0, - .clock_set = sgi_clock_set, - .clock_get = sgi_clock_get, - .timer_create = sgi_timer_create, - .nsleep = do_posix_clock_nonanosleep, - .timer_set = sgi_timer_set, - .timer_del = sgi_timer_del, - .timer_get = sgi_timer_get + .clock_set = sgi_clock_set, + .clock_get = sgi_clock_get, + .clock_getres = sgi_clock_getres, + .timer_create = sgi_timer_create, + .timer_set = sgi_timer_set, + .timer_del = sgi_timer_del, + .timer_get = sgi_timer_get }; /** @@ -831,8 +839,8 @@ static int __init mmtimer_init(void) (unsigned long) node); } - sgi_clock_period = sgi_clock.res = NSEC_PER_SEC / sn_rtc_cycles_per_second; - register_posix_clock(CLOCK_SGI_CYCLE, &sgi_clock); + sgi_clock_period = NSEC_PER_SEC / sn_rtc_cycles_per_second; + posix_timers_register_clock(CLOCK_SGI_CYCLE, &sgi_clock); printk(KERN_INFO "%s: v%s, %ld MHz\n", MMTIMER_DESC, MMTIMER_VERSION, sn_rtc_cycles_per_second/(unsigned long)1E6); diff --git a/drivers/char/pcmcia/cm4000_cs.c b/drivers/char/pcmcia/cm4000_cs.c index 777181a..bcbbc71 100644 --- a/drivers/char/pcmcia/cm4000_cs.c +++ b/drivers/char/pcmcia/cm4000_cs.c @@ -830,8 +830,7 @@ static void monitor_card(unsigned long p) test_bit(IS_ANY_T1, &dev->flags))) { DEBUGP(4, dev, "Perform AUTOPPS\n"); set_bit(IS_AUTOPPS_ACT, &dev->flags); - ptsreq.protocol = ptsreq.protocol = - (0x01 << dev->proto); + ptsreq.protocol = (0x01 << dev->proto); ptsreq.flags = 0x01; ptsreq.pts1 = 0x00; ptsreq.pts2 = 0x00; diff --git a/drivers/char/random.c b/drivers/char/random.c index 72a4fcb..5e29e80 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -128,6 +128,7 @@ * void add_input_randomness(unsigned int type, unsigned int code, * unsigned int value); * void add_interrupt_randomness(int irq); + * void add_disk_randomness(struct gendisk *disk); * * add_input_randomness() uses the input layer interrupt timing, as well as * the event type information from the hardware. @@ -136,9 +137,15 @@ * inputs to the entropy pool. Note that not all interrupts are good * sources of randomness! For example, the timer interrupts is not a * good choice, because the periodicity of the interrupts is too - * regular, and hence predictable to an attacker. Disk interrupts are - * a better measure, since the timing of the disk interrupts are more - * unpredictable. + * regular, and hence predictable to an attacker. Network Interface + * Controller interrupts are a better measure, since the timing of the + * NIC interrupts are more unpredictable. + * + * add_disk_randomness() uses what amounts to the seek time of block + * layer request events, on a per-disk_devt basis, as input to the + * entropy pool. Note that high-speed solid state drives with very low + * seek times do not make for good sources of entropy, as their seek + * times are usually fairly consistent. * * All of these routines try to estimate how many bits of randomness a * particular randomness source. They do this by keeping track of the diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c index 36e0fa1..1f46f1c 100644 --- a/drivers/char/tpm/tpm.c +++ b/drivers/char/tpm/tpm.c @@ -364,14 +364,12 @@ unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, tpm_protected_ordinal_duration[ordinal & TPM_PROTECTED_ORDINAL_MASK]; - if (duration_idx != TPM_UNDEFINED) { + if (duration_idx != TPM_UNDEFINED) duration = chip->vendor.duration[duration_idx]; - /* if duration is 0, it's because chip->vendor.duration wasn't */ - /* filled yet, so we set the lowest timeout just to give enough */ - /* time for tpm_get_timeouts() to succeed */ - return (duration <= 0 ? HZ : duration); - } else + if (duration <= 0) return 2 * 60 * HZ; + else + return duration; } EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration); diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 4903931..84b164d 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -388,6 +388,10 @@ static void discard_port_data(struct port *port) unsigned int len; int ret; + if (!port->portdev) { + /* Device has been unplugged. vqs are already gone. */ + return; + } vq = port->in_vq; if (port->inbuf) buf = port->inbuf; @@ -470,6 +474,10 @@ static void reclaim_consumed_buffers(struct port *port) void *buf; unsigned int len; + if (!port->portdev) { + /* Device has been unplugged. vqs are already gone. */ + return; + } while ((buf = virtqueue_get_buf(port->out_vq, &len))) { kfree(buf); port->outvq_full = false; |