Improve the irq management by using a new function wait_for_stat.
Instead of using a completion struct, we rely on the waitqueue read_queue
and int_queue from chip->vendor field.
Reviewed-by: Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Christophe Ricard <christophe-h.ricard@xxxxxx>
---
drivers/char/tpm/tpm_i2c_stm_st33.c | 197 ++++++++++++++++++++----------------
1 file changed, 109 insertions(+), 88 deletions(-)
diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index a444cd3..eb0244a 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -38,6 +38,7 @@
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/wait.h>
+#include <linux/freezer.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/sysfs.h>
@@ -102,9 +103,9 @@ enum tis_defaults {
struct tpm_stm_dev {
struct i2c_client *client;
- struct completion irq_detection;
struct tpm_chip *chip;
u8 buf[TPM_BUFSIZE + 1];
+ u32 intrs;
int io_lpcpd;
};
@@ -174,61 +175,18 @@ static int read8_reg(struct tpm_stm_dev *tpm_dev, u8 tpm_register,
* clear_interruption
* clear the TPM interrupt register.
* @param: tpm, the chip description
+ * @return: the TPM_INT_STATUS value
*/
-static void clear_interruption(struct tpm_stm_dev *tpm_dev)
+static u8 clear_interruption(struct tpm_stm_dev *tpm_dev)
{
u8 interrupt;
I2C_READ_DATA(tpm_dev, TPM_INT_STATUS, &interrupt, 1);
I2C_WRITE_DATA(tpm_dev, TPM_INT_STATUS, &interrupt, 1);
- I2C_READ_DATA(tpm_dev, TPM_INT_STATUS, &interrupt, 1);
+ return interrupt;
} /* clear_interruption() */
/*
- * _wait_for_interrupt_serirq_timeout
- * @param: tpm, the chip description
- * @param: timeout, the timeout of the interrupt
- * @return: the status of the interruption.
- */
-static long _wait_for_interrupt_serirq_timeout(struct tpm_chip *chip,
- unsigned long timeout)
-{
- long status;
- struct i2c_client *client;
- struct tpm_stm_dev *tpm_dev;
-
- tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
- client = tpm_dev->client;
-
- status = wait_for_completion_interruptible_timeout(
- &tpm_dev->irq_detection,
- timeout);
- if (status > 0)
- enable_irq(client->irq);
-
- return status;
-} /* wait_for_interrupt_serirq_timeout() */
-
-static int wait_for_serirq_timeout(struct tpm_chip *chip, bool condition,
- unsigned long timeout)
-{
- int status = 2;
- struct tpm_stm_dev *tpm_dev;
-
- tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
-
- status = _wait_for_interrupt_serirq_timeout(chip, timeout);
- if (!status) {
- status = -EBUSY;
- } else {
- clear_interruption(tpm_dev);
- if (condition)
- status = 1;
- }
- return status;
-} /* wait_for_serirq_timeout() */
-
-/*
* tpm_stm_i2c_cancel, cancel is not implemented.
* @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
*/
@@ -241,8 +199,6 @@ static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
data = TPM_STS_COMMAND_READY;
I2C_WRITE_DATA(tpm_dev, TPM_STS, &data, 1);
- if (chip->vendor.irq)
- wait_for_serirq_timeout(chip, 1, chip->vendor.timeout_a);
} /* tpm_stm_i2c_cancel() */
/*
@@ -297,30 +253,24 @@ static int request_locality(struct tpm_chip *chip)
struct tpm_stm_dev *tpm_dev;
u8 data;
- tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
-
if (check_locality(chip) == chip->vendor.locality)
return chip->vendor.locality;
+ tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
+
data = TPM_ACCESS_REQUEST_USE;
ret = I2C_WRITE_DATA(tpm_dev, TPM_ACCESS, &data, 1);
if (ret < 0)
goto end;
- if (chip->vendor.irq) {
- ret = wait_for_serirq_timeout(chip, (check_locality
- (chip) >= 0),
- chip->vendor.timeout_a);
- if (ret > 0)
+ stop = jiffies + chip->vendor.timeout_a;
+
+ /* Request locality is usually effective after the request */
+ do {
+ if (check_locality(chip) >= 0)
return chip->vendor.locality;
- } else {
- stop = jiffies + chip->vendor.timeout_a;
- do {
- if (check_locality(chip) >= 0)
- return chip->vendor.locality;
- msleep(TPM_TIMEOUT);
- } while (time_before(jiffies, stop));
- }
+ msleep(TPM_TIMEOUT);
+ } while (time_before(jiffies, stop));
ret = -EACCES;
end:
return ret;
@@ -378,36 +328,107 @@ end:
return -EBUSY;
} /* get_burstcount() */
+static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
+ bool check_cancel, bool *canceled)
+{
+ u8 status = chip->ops->status(chip);
+
+ *canceled = false;
+ if ((status & mask) == mask)
+ return true;
+ if (check_cancel && chip->ops->req_canceled(chip, status)) {
+ *canceled = true;
+ return true;
+ }
+ return false;
+}
+
+/*
+ * interrupt_to_status
+ * @param: irq_mask, the irq mask value to wait
+ * @return: the corresponding tpm_sts value
+ */
+static u8 interrupt_to_status(u8 irq_mask)
+{
+ u8 status = 0;
+
+ if ((irq_mask & TPM_INTF_STS_VALID_INT) == TPM_INTF_STS_VALID_INT)
+ status |= TPM_STS_VALID;
+ if ((irq_mask & TPM_INTF_DATA_AVAIL_INT) == TPM_INTF_DATA_AVAIL_INT)
+ status |= TPM_STS_DATA_AVAIL;
+ if ((irq_mask & TPM_INTF_CMD_READY_INT) == TPM_INTF_CMD_READY_INT)
+ status |= TPM_STS_COMMAND_READY;
+
+ return status;
+} /* status_to_interrupt() */
+
/*
* wait_for_stat wait for a TPM_STS value
* @param: chip, the tpm chip description
* @param: mask, the value mask to wait
* @param: timeout, the timeout
* @param: queue, the wait queue.
+ * @param: check_cancel, does the command can be cancelled ?
* @return: the tpm status, 0 if success, -ETIME if timeout is reached.
*/
static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
- wait_queue_head_t *queue)
+ wait_queue_head_t *queue, bool check_cancel)
{
unsigned long stop;
- long ret;
- u8 status;
+ int r;
+ bool canceled = false;
+ bool condition;
+ u32 cur_intrs;
+ u8 interrupt, status;
+ struct tpm_stm_dev *tpm_dev;
+
+ tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
+
+ /* check current status */
+ status = tpm_stm_i2c_status(chip);
+ if ((status & mask) == mask)
+ return 0;
+
+ stop = jiffies + timeout;
if (chip->vendor.irq) {
- ret = wait_for_serirq_timeout(chip, ((tpm_stm_i2c_status
- (chip) & mask) ==
- mask), timeout);
- if (ret > 0)
+ cur_intrs = tpm_dev->intrs;
+ interrupt = clear_interruption(tpm_dev);
+ enable_irq(chip->vendor.irq);
+
+again:
+ timeout = stop - jiffies;
+ if ((long) timeout <= 0)
+ return -1;
+
+ r = wait_event_interruptible_timeout(*queue,
+ cur_intrs != tpm_dev->intrs, timeout);
+
+ interrupt |= clear_interruption(tpm_dev);
+ status = interrupt_to_status(interrupt);
+ condition = wait_for_tpm_stat_cond(chip, mask,
+ check_cancel, &canceled);
+
+ if (r >= 0 && condition) {
+ if (canceled)
+ return -ECANCELED;
return 0;
+ }
+ if (r == -ERESTARTSYS && freezing(current)) {
+ clear_thread_flag(TIF_SIGPENDING);
+ goto again;
+ }
+ disable_irq_nosync(chip->vendor.irq);
+
} else {
- stop = jiffies + timeout;
do {
msleep(TPM_TIMEOUT);
- status = tpm_stm_i2c_status(chip);
+ status = chip->ops->status(chip);
if ((status & mask) == mask)
return 0;
} while (time_before(jiffies, stop));
}
+
return -ETIME;
} /* wait_for_stat() */
@@ -429,7 +450,7 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
wait_for_stat(chip,
TPM_STS_DATA_AVAIL | TPM_STS_VALID,
chip->vendor.timeout_c,
- &chip->vendor.read_queue) == 0) {
+ &chip->vendor.read_queue, true) == 0) {
burstcnt = get_burstcount(chip);
if (burstcnt < 0)
return burstcnt;
@@ -449,15 +470,14 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
{
struct tpm_chip *chip = dev_id;
- struct i2c_client *client;
struct tpm_stm_dev *tpm_dev;
- disable_irq_nosync(irq);
-
tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
- client = tpm_dev->client;
- complete(&tpm_dev->irq_detection);
+ tpm_dev->intrs++;
+ wake_up_interruptible(&chip->vendor.read_queue);
+ disable_irq_nosync(chip->vendor.irq);
+
return IRQ_HANDLED;
} /* tpm_ioserirq_handler() */
@@ -500,7 +520,7 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
tpm_stm_i2c_cancel(chip);
if (wait_for_stat
(chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
- &chip->vendor.int_queue) < 0) {
+ &chip->vendor.read_queue, false) < 0) {
ret = -ETIME;
goto out_err;
}
@@ -743,7 +763,10 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
chip->vendor.locality = LOCALITY0;
if (client->irq) {
- init_completion(&tpm_dev->irq_detection);
+ /* INTERRUPT Setup */
+ init_waitqueue_head(&chip->vendor.read_queue);
+ tpm_dev->intrs = 0;
+
if (request_locality(chip) != LOCALITY0) {
ret = -ENODEV;
goto _tpm_clean_answer;
@@ -765,9 +788,6 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
goto _tpm_clean_answer;
intmask |= TPM_INTF_CMD_READY_INT
- | TPM_INTF_FIFO_AVALAIBLE_INT
- | TPM_INTF_WAKE_UP_READY_INT
- | TPM_INTF_LOCALITY_CHANGE_INT
| TPM_INTF_STS_VALID_INT
| TPM_INTF_DATA_AVAIL_INT;
@@ -787,6 +807,8 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
chip->vendor.irq = client->irq;
+ disable_irq_nosync(chip->vendor.irq);
+
tpm_gen_interrupt(chip);
}
@@ -852,10 +874,9 @@ static int tpm_stm_i2c_pm_resume(struct device *dev)
if (gpio_is_valid(pin_infos->io_lpcpd)) {
gpio_set_value(pin_infos->io_lpcpd, 1);
- ret = wait_for_serirq_timeout(chip,
- (chip->ops->status(chip) &
- TPM_STS_VALID) == TPM_STS_VALID,
- chip->vendor.timeout_b);
+ ret = wait_for_stat(chip,
+ TPM_STS_VALID, chip->vendor.timeout_b,
+ &chip->vendor.read_queue, false);
} else {
ret = tpm_pm_resume(dev);
if (!ret)
--
2.1.0
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