diff options
Diffstat (limited to 'drivers/char/tpm/tpm_tis.c')
| -rw-r--r-- | drivers/char/tpm/tpm_tis.c | 179 |
1 files changed, 161 insertions, 18 deletions
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index dd21df55689..3f4051a7c5a 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -26,6 +26,7 @@ #include <linux/interrupt.h> #include <linux/wait.h> #include <linux/acpi.h> +#include <linux/freezer.h> #include "tpm.h" #define TPM_HEADER_SIZE 10 @@ -79,7 +80,7 @@ enum tis_defaults { static LIST_HEAD(tis_chips); static DEFINE_SPINLOCK(tis_lock); -#ifdef CONFIG_ACPI +#if defined(CONFIG_PNP) && defined(CONFIG_ACPI) static int is_itpm(struct pnp_dev *dev) { struct acpi_device *acpi = pnp_acpi_device(dev); @@ -93,7 +94,7 @@ static int is_itpm(struct pnp_dev *dev) return 0; } #else -static int is_itpm(struct pnp_dev *dev) +static inline int is_itpm(struct pnp_dev *dev) { return 0; } @@ -120,7 +121,7 @@ static void release_locality(struct tpm_chip *chip, int l, int force) static int request_locality(struct tpm_chip *chip, int l) { - unsigned long stop; + unsigned long stop, timeout; long rc; if (check_locality(chip, l) >= 0) @@ -129,17 +130,25 @@ static int request_locality(struct tpm_chip *chip, int l) iowrite8(TPM_ACCESS_REQUEST_USE, chip->vendor.iobase + TPM_ACCESS(l)); + stop = jiffies + chip->vendor.timeout_a; + if (chip->vendor.irq) { +again: + timeout = stop - jiffies; + if ((long)timeout <= 0) + return -1; rc = wait_event_interruptible_timeout(chip->vendor.int_queue, (check_locality (chip, l) >= 0), - chip->vendor.timeout_a); + timeout); if (rc > 0) return l; - + if (rc == -ERESTARTSYS && freezing(current)) { + clear_thread_flag(TIF_SIGPENDING); + goto again; + } } else { /* wait for burstcount */ - stop = jiffies + chip->vendor.timeout_a; do { if (check_locality(chip, l) >= 0) return l; @@ -196,15 +205,24 @@ static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout, if ((status & mask) == mask) return 0; + stop = jiffies + timeout; + if (chip->vendor.irq) { +again: + timeout = stop - jiffies; + if ((long)timeout <= 0) + return -ETIME; rc = wait_event_interruptible_timeout(*queue, ((tpm_tis_status (chip) & mask) == mask), timeout); if (rc > 0) return 0; + if (rc == -ERESTARTSYS && freezing(current)) { + clear_thread_flag(TIF_SIGPENDING); + goto again; + } } else { - stop = jiffies + timeout; do { msleep(TPM_TIMEOUT); status = tpm_tis_status(chip); @@ -288,11 +306,10 @@ MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)"); * tpm.c can skip polling for the data to be available as the interrupt is * waited for here */ -static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) +static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len) { int rc, status, burstcnt; size_t count = 0; - u32 ordinal; if (request_locality(chip, 0) < 0) return -EBUSY; @@ -327,8 +344,7 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) /* write last byte */ iowrite8(buf[count], - chip->vendor.iobase + - TPM_DATA_FIFO(chip->vendor.locality)); + chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality)); wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, &chip->vendor.int_queue); status = tpm_tis_status(chip); @@ -337,6 +353,28 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) goto out_err; } + return 0; + +out_err: + tpm_tis_ready(chip); + release_locality(chip, chip->vendor.locality, 0); + return rc; +} + +/* + * If interrupts are used (signaled by an irq set in the vendor structure) + * tpm.c can skip polling for the data to be available as the interrupt is + * waited for here + */ +static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) +{ + int rc; + u32 ordinal; + + rc = tpm_tis_send_data(chip, buf, len); + if (rc < 0) + return rc; + /* go and do it */ iowrite8(TPM_STS_GO, chip->vendor.iobase + TPM_STS(chip->vendor.locality)); @@ -358,6 +396,47 @@ out_err: return rc; } +/* + * Early probing for iTPM with STS_DATA_EXPECT flaw. + * Try sending command without itpm flag set and if that + * fails, repeat with itpm flag set. + */ +static int probe_itpm(struct tpm_chip *chip) +{ + int rc = 0; + u8 cmd_getticks[] = { + 0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a, + 0x00, 0x00, 0x00, 0xf1 + }; + size_t len = sizeof(cmd_getticks); + int rem_itpm = itpm; + + itpm = 0; + + rc = tpm_tis_send_data(chip, cmd_getticks, len); + if (rc == 0) + goto out; + + tpm_tis_ready(chip); + release_locality(chip, chip->vendor.locality, 0); + + itpm = 1; + + rc = tpm_tis_send_data(chip, cmd_getticks, len); + if (rc == 0) { + dev_info(chip->dev, "Detected an iTPM.\n"); + rc = 1; + } else + rc = -EFAULT; + +out: + itpm = rem_itpm; + tpm_tis_ready(chip); + release_locality(chip, chip->vendor.locality, 0); + + return rc; +} + static const struct file_operations tis_ops = { .owner = THIS_MODULE, .llseek = no_llseek, @@ -376,6 +455,8 @@ static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated, NULL); static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL); static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel); +static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL); +static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL); static struct attribute *tis_attrs[] = { &dev_attr_pubek.attr, @@ -385,7 +466,9 @@ static struct attribute *tis_attrs[] = { &dev_attr_owned.attr, &dev_attr_temp_deactivated.attr, &dev_attr_caps.attr, - &dev_attr_cancel.attr, NULL, + &dev_attr_cancel.attr, + &dev_attr_durations.attr, + &dev_attr_timeouts.attr, NULL, }; static struct attribute_group tis_attr_grp = { @@ -416,7 +499,7 @@ static irqreturn_t tis_int_probe(int irq, void *dev_id) if (interrupt == 0) return IRQ_NONE; - chip->vendor.irq = irq; + chip->vendor.probed_irq = irq; /* Clear interrupts handled with TPM_EOI */ iowrite32(interrupt, @@ -464,7 +547,7 @@ static int tpm_tis_init(struct device *dev, resource_size_t start, resource_size_t len, unsigned int irq) { u32 vendor, intfcaps, intmask; - int rc, i; + int rc, i, irq_s, irq_e; struct tpm_chip *chip; if (!(chip = tpm_register_hardware(dev, &tpm_tis))) @@ -493,6 +576,14 @@ static int tpm_tis_init(struct device *dev, resource_size_t start, "1.2 TPM (device-id 0x%X, rev-id %d)\n", vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0))); + if (!itpm) { + itpm = probe_itpm(chip); + if (itpm < 0) { + rc = -ENODEV; + goto out_err; + } + } + if (itpm) dev_info(dev, "Intel iTPM workaround enabled\n"); @@ -522,6 +613,9 @@ static int tpm_tis_init(struct device *dev, resource_size_t start, if (intfcaps & TPM_INTF_DATA_AVAIL_INT) dev_dbg(dev, "\tData Avail Int Support\n"); + /* get the timeouts before testing for irqs */ + tpm_get_timeouts(chip); + /* INTERRUPT Setup */ init_waitqueue_head(&chip->vendor.read_queue); init_waitqueue_head(&chip->vendor.int_queue); @@ -540,13 +634,19 @@ static int tpm_tis_init(struct device *dev, resource_size_t start, if (interrupts) chip->vendor.irq = irq; if (interrupts && !chip->vendor.irq) { - chip->vendor.irq = + irq_s = ioread8(chip->vendor.iobase + TPM_INT_VECTOR(chip->vendor.locality)); + if (irq_s) { + irq_e = irq_s; + } else { + irq_s = 3; + irq_e = 15; + } - for (i = 3; i < 16 && chip->vendor.irq == 0; i++) { + for (i = irq_s; i <= irq_e && chip->vendor.irq == 0; i++) { iowrite8(i, chip->vendor.iobase + - TPM_INT_VECTOR(chip->vendor.locality)); + TPM_INT_VECTOR(chip->vendor.locality)); if (request_irq (i, tis_int_probe, IRQF_SHARED, chip->vendor.miscdev.name, chip) != 0) { @@ -568,9 +668,22 @@ static int tpm_tis_init(struct device *dev, resource_size_t start, chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality)); + chip->vendor.probed_irq = 0; + /* Generate Interrupts */ tpm_gen_interrupt(chip); + chip->vendor.irq = chip->vendor.probed_irq; + + /* free_irq will call into tis_int_probe; + clear all irqs we haven't seen while doing + tpm_gen_interrupt */ + iowrite32(ioread32 + (chip->vendor.iobase + + TPM_INT_STATUS(chip->vendor.locality)), + chip->vendor.iobase + + TPM_INT_STATUS(chip->vendor.locality)); + /* Turn off */ iowrite32(intmask, chip->vendor.iobase + @@ -609,7 +722,6 @@ static int tpm_tis_init(struct device *dev, resource_size_t start, list_add(&chip->vendor.list, &tis_chips); spin_unlock(&tis_lock); - tpm_get_timeouts(chip); tpm_continue_selftest(chip); return 0; @@ -619,6 +731,29 @@ out_err: tpm_remove_hardware(chip->dev); return rc; } + +static void tpm_tis_reenable_interrupts(struct tpm_chip *chip) +{ + u32 intmask; + + /* reenable interrupts that device may have lost or + BIOS/firmware may have disabled */ + iowrite8(chip->vendor.irq, chip->vendor.iobase + + TPM_INT_VECTOR(chip->vendor.locality)); + + intmask = + ioread32(chip->vendor.iobase + + TPM_INT_ENABLE(chip->vendor.locality)); + + intmask |= TPM_INTF_CMD_READY_INT + | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT + | TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE; + + iowrite32(intmask, + chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality)); +} + + #ifdef CONFIG_PNP static int __devinit tpm_tis_pnp_init(struct pnp_dev *pnp_dev, const struct pnp_device_id *pnp_id) @@ -650,6 +785,9 @@ static int tpm_tis_pnp_resume(struct pnp_dev *dev) struct tpm_chip *chip = pnp_get_drvdata(dev); int ret; + if (chip->vendor.irq) + tpm_tis_reenable_interrupts(chip); + ret = tpm_pm_resume(&dev->dev); if (!ret) tpm_continue_selftest(chip); @@ -702,6 +840,11 @@ static int tpm_tis_suspend(struct platform_device *dev, pm_message_t msg) static int tpm_tis_resume(struct platform_device *dev) { + struct tpm_chip *chip = dev_get_drvdata(&dev->dev); + + if (chip->vendor.irq) + tpm_tis_reenable_interrupts(chip); + return tpm_pm_resume(&dev->dev); } static struct platform_driver tis_drv = { |