| Message ID | 20221103145450.1409273-3-jsd@semihalf.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | char: tpm: Adjust cr50_i2c locking mechanism | expand |
On Thu, Nov 03, 2022 at 03:54:49PM +0100, Jan Dabros wrote: > Instead of using static functions tpm_cr50_request_locality and > tpm_cr50_release_locality register callbacks from tpm class chip->ops > created for this purpose. > > Signed-off-by: Jan Dabros <jsd@semihalf.com> I get that architecturally using the standard callbacks is a good idea. Still, you should explicitly document the gain because the existing code is working and field tested. > --- > drivers/char/tpm/tpm_tis_i2c_cr50.c | 106 ++++++++++++++++++---------- > 1 file changed, 70 insertions(+), 36 deletions(-) > > diff --git a/drivers/char/tpm/tpm_tis_i2c_cr50.c b/drivers/char/tpm/tpm_tis_i2c_cr50.c > index 77cea5b31c6e4..517d8410d7da0 100644 > --- a/drivers/char/tpm/tpm_tis_i2c_cr50.c > +++ b/drivers/char/tpm/tpm_tis_i2c_cr50.c > @@ -17,6 +17,7 @@ > */ > > #include <linux/acpi.h> > +#include <linux/bug.h> > #include <linux/completion.h> > #include <linux/i2c.h> > #include <linux/interrupt.h> > @@ -35,6 +36,7 @@ > #define TPM_CR50_I2C_MAX_RETRIES 3 /* Max retries due to I2C errors */ > #define TPM_CR50_I2C_RETRY_DELAY_LO 55 /* Min usecs between retries on I2C */ > #define TPM_CR50_I2C_RETRY_DELAY_HI 65 /* Max usecs between retries on I2C */ > +#define TPM_CR50_I2C_DEFAULT_LOC 0 > > #define TPM_I2C_ACCESS(l) (0x0000 | ((l) << 4)) > #define TPM_I2C_STS(l) (0x0001 | ((l) << 4)) > @@ -286,20 +288,21 @@ static int tpm_cr50_i2c_write(struct tpm_chip *chip, u8 addr, u8 *buffer, > } > > /** > - * tpm_cr50_check_locality() - Verify TPM locality 0 is active. > + * tpm_cr50_check_locality() - Verify if required TPM locality is active. > * @chip: A TPM chip. > + * @loc: Locality to be verified > * > * Return: > * - 0: Success. > * - -errno: A POSIX error code. > */ > -static int tpm_cr50_check_locality(struct tpm_chip *chip) > +static int tpm_cr50_check_locality(struct tpm_chip *chip, int loc) > { > u8 mask = TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY; > u8 buf; > int rc; > > - rc = tpm_cr50_i2c_read(chip, TPM_I2C_ACCESS(0), &buf, sizeof(buf)); > + rc = tpm_cr50_i2c_read(chip, TPM_I2C_ACCESS(loc), &buf, sizeof(buf)); > if (rc < 0) > return rc; > > @@ -312,48 +315,57 @@ static int tpm_cr50_check_locality(struct tpm_chip *chip) > /** > * tpm_cr50_release_locality() - Release TPM locality. > * @chip: A TPM chip. > - * @force: Flag to force release if set. > + * @loc: Locality to be released > + * > + * Return: > + * - 0: Success. > + * - -errno: A POSIX error code. > */ > -static void tpm_cr50_release_locality(struct tpm_chip *chip, bool force) > +static int tpm_cr50_release_locality(struct tpm_chip *chip, int loc) > { > u8 mask = TPM_ACCESS_VALID | TPM_ACCESS_REQUEST_PENDING; > - u8 addr = TPM_I2C_ACCESS(0); > + u8 addr = TPM_I2C_ACCESS(loc); > u8 buf; > + int rc; > > - if (tpm_cr50_i2c_read(chip, addr, &buf, sizeof(buf)) < 0) > - return; > + rc = tpm_cr50_i2c_read(chip, addr, &buf, sizeof(buf)); > + if (rc < 0) > + return rc; > > - if (force || (buf & mask) == mask) { > + if ((buf & mask) == mask) { > buf = TPM_ACCESS_ACTIVE_LOCALITY; > - tpm_cr50_i2c_write(chip, addr, &buf, sizeof(buf)); > + rc = tpm_cr50_i2c_write(chip, addr, &buf, sizeof(buf)); > } > + > + return rc; > } > > /** > - * tpm_cr50_request_locality() - Request TPM locality 0. > + * tpm_cr50_request_locality() - Request TPM locality. > * @chip: A TPM chip. > + * @loc: Locality to be requested. > * > * Return: > - * - 0: Success. > + * - loc: Success. > * - -errno: A POSIX error code. > */ > -static int tpm_cr50_request_locality(struct tpm_chip *chip) > +static int tpm_cr50_request_locality(struct tpm_chip *chip, int loc) > { > u8 buf = TPM_ACCESS_REQUEST_USE; > unsigned long stop; > int rc; > > - if (!tpm_cr50_check_locality(chip)) > - return 0; > + if (!tpm_cr50_check_locality(chip, loc)) > + return loc; > > - rc = tpm_cr50_i2c_write(chip, TPM_I2C_ACCESS(0), &buf, sizeof(buf)); > + rc = tpm_cr50_i2c_write(chip, TPM_I2C_ACCESS(loc), &buf, sizeof(buf)); > if (rc < 0) > return rc; > > stop = jiffies + chip->timeout_a; > do { > - if (!tpm_cr50_check_locality(chip)) > - return 0; > + if (!tpm_cr50_check_locality(chip, loc)) > + return loc; > > msleep(TPM_CR50_TIMEOUT_SHORT_MS); > } while (time_before(jiffies, stop)); > @@ -374,7 +386,12 @@ static u8 tpm_cr50_i2c_tis_status(struct tpm_chip *chip) > { > u8 buf[4]; > > - if (tpm_cr50_i2c_read(chip, TPM_I2C_STS(0), buf, sizeof(buf)) < 0) > + if (chip->locality < 0){ > + WARN_ONCE(1, "Incorrect tpm locality value\n"); Never ever add WARN() for a success case. It can ultimately crash the whole system, if panic_on_warn is enabled. Since this is a success case, judging from the return value, at most you should use pr_info() here. > + return 0; > + } > + > + if (tpm_cr50_i2c_read(chip, TPM_I2C_STS(chip->locality), buf, sizeof(buf)) < 0) > return 0; > > return buf[0]; > @@ -390,7 +407,12 @@ static void tpm_cr50_i2c_tis_set_ready(struct tpm_chip *chip) > { > u8 buf[4] = { TPM_STS_COMMAND_READY }; > > - tpm_cr50_i2c_write(chip, TPM_I2C_STS(0), buf, sizeof(buf)); > + if (chip->locality < 0) { > + WARN_ONCE(1, "Incorrect tpm locality value\n"); > + return; > + } > + > + tpm_cr50_i2c_write(chip, TPM_I2C_STS(chip->locality), buf, sizeof(buf)); > msleep(TPM_CR50_TIMEOUT_SHORT_MS); > } > > @@ -420,7 +442,7 @@ static int tpm_cr50_i2c_get_burst_and_status(struct tpm_chip *chip, u8 mask, > stop = jiffies + chip->timeout_b; > > do { > - if (tpm_cr50_i2c_read(chip, TPM_I2C_STS(0), buf, sizeof(buf)) < 0) { > + if (tpm_cr50_i2c_read(chip, TPM_I2C_STS(chip->locality), buf, sizeof(buf)) < 0) { > msleep(TPM_CR50_TIMEOUT_SHORT_MS); > continue; > } > @@ -454,10 +476,15 @@ static int tpm_cr50_i2c_tis_recv(struct tpm_chip *chip, u8 *buf, size_t buf_len) > > u8 mask = TPM_STS_VALID | TPM_STS_DATA_AVAIL; > size_t burstcnt, cur, len, expected; > - u8 addr = TPM_I2C_DATA_FIFO(0); > + u8 addr = TPM_I2C_DATA_FIFO(chip->locality); > u32 status; > int rc; > > + if (chip->locality < 0) { > + WARN_ONCE(1, "Incorrect tpm locality value\n"); > + return -EINVAL; > + } > + > if (buf_len < TPM_HEADER_SIZE) > return -EINVAL; > > @@ -516,7 +543,6 @@ static int tpm_cr50_i2c_tis_recv(struct tpm_chip *chip, u8 *buf, size_t buf_len) > goto out_err; > } > > - tpm_cr50_release_locality(chip, false); > return cur; > > out_err: > @@ -524,7 +550,6 @@ static int tpm_cr50_i2c_tis_recv(struct tpm_chip *chip, u8 *buf, size_t buf_len) > if (tpm_cr50_i2c_tis_status(chip) & TPM_STS_COMMAND_READY) > tpm_cr50_i2c_tis_set_ready(chip); > > - tpm_cr50_release_locality(chip, false); > return rc; > } > > @@ -546,9 +571,10 @@ static int tpm_cr50_i2c_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) > u32 status; > int rc; > > - rc = tpm_cr50_request_locality(chip); > - if (rc < 0) > - return rc; > + if (chip->locality < 0) { > + WARN_ONCE(1, "Incorrect tpm locality value\n"); > + return -EINVAL; > + } > > /* Wait until TPM is ready for a command */ > stop = jiffies + chip->timeout_b; > @@ -578,7 +604,8 @@ static int tpm_cr50_i2c_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) > * that is inserted by tpm_cr50_i2c_write() > */ > limit = min_t(size_t, burstcnt - 1, len); > - rc = tpm_cr50_i2c_write(chip, TPM_I2C_DATA_FIFO(0), &buf[sent], limit); > + rc = tpm_cr50_i2c_write(chip, TPM_I2C_DATA_FIFO(chip->locality), > + &buf[sent], limit); > if (rc < 0) { > dev_err(&chip->dev, "Write failed\n"); > goto out_err; > @@ -599,7 +626,7 @@ static int tpm_cr50_i2c_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) > } > > /* Start the TPM command */ > - rc = tpm_cr50_i2c_write(chip, TPM_I2C_STS(0), tpm_go, > + rc = tpm_cr50_i2c_write(chip, TPM_I2C_STS(chip->locality), tpm_go, > sizeof(tpm_go)); > if (rc < 0) { > dev_err(&chip->dev, "Start command failed\n"); > @@ -612,7 +639,6 @@ static int tpm_cr50_i2c_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) > if (tpm_cr50_i2c_tis_status(chip) & TPM_STS_COMMAND_READY) > tpm_cr50_i2c_tis_set_ready(chip); > > - tpm_cr50_release_locality(chip, false); > return rc; > } > > @@ -651,6 +677,8 @@ static const struct tpm_class_ops cr50_i2c = { > .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, > .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, > .req_canceled = &tpm_cr50_i2c_req_canceled, > + .request_locality = &tpm_cr50_request_locality, > + .relinquish_locality = &tpm_cr50_release_locality, > }; > > #ifdef CONFIG_ACPI > @@ -686,6 +714,7 @@ static int tpm_cr50_i2c_probe(struct i2c_client *client) > u32 vendor; > u8 buf[4]; > int rc; > + int loc; > > if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) > return -ENODEV; > @@ -728,24 +757,30 @@ static int tpm_cr50_i2c_probe(struct i2c_client *client) > TPM_CR50_TIMEOUT_NOIRQ_MS); > } > > - rc = tpm_cr50_request_locality(chip); > - if (rc < 0) { > + loc = tpm_cr50_request_locality(chip, TPM_CR50_I2C_DEFAULT_LOC); > + if (loc < 0) { > dev_err(dev, "Could not request locality\n"); > return rc; > } > > /* Read four bytes from DID_VID register */ > - rc = tpm_cr50_i2c_read(chip, TPM_I2C_DID_VID(0), buf, sizeof(buf)); > + rc = tpm_cr50_i2c_read(chip, TPM_I2C_DID_VID(loc), buf, sizeof(buf)); > if (rc < 0) { > dev_err(dev, "Could not read vendor id\n"); > - tpm_cr50_release_locality(chip, true); > + if (tpm_cr50_release_locality(chip, loc)) > + dev_err(dev, "Could not release locality\n"); > + return rc; > + } > + > + rc = tpm_cr50_release_locality(chip, loc); > + if (rc) { > + dev_err(dev, "Could not release locality\n"); > return rc; > } > > vendor = le32_to_cpup((__le32 *)buf); > if (vendor != TPM_CR50_I2C_DID_VID && vendor != TPM_TI50_I2C_DID_VID) { > dev_err(dev, "Vendor ID did not match! ID was %08x\n", vendor); > - tpm_cr50_release_locality(chip, true); > return -ENODEV; > } > > @@ -774,7 +809,6 @@ static void tpm_cr50_i2c_remove(struct i2c_client *client) > } > > tpm_chip_unregister(chip); > - tpm_cr50_release_locality(chip, true); > } > > static SIMPLE_DEV_PM_OPS(cr50_i2c_pm, tpm_pm_suspend, tpm_pm_resume); > -- > 2.38.1.273.g43a17bfeac-goog > BR, Jarkko
> On Thu, Nov 03, 2022 at 03:54:49PM +0100, Jan Dabros wrote: > > Instead of using static functions tpm_cr50_request_locality and > > tpm_cr50_release_locality register callbacks from tpm class chip->ops > > created for this purpose. > > > > Signed-off-by: Jan Dabros <jsd@semihalf.com> > > I get that architecturally using the standard callbacks is a good idea. > Still, you should explicitly document the gain because the existing code > is working and field tested. ACK. I will mention here about the overall idea I have. > > > --- > > drivers/char/tpm/tpm_tis_i2c_cr50.c | 106 ++++++++++++++++++---------- > > 1 file changed, 70 insertions(+), 36 deletions(-) > > > > diff --git a/drivers/char/tpm/tpm_tis_i2c_cr50.c b/drivers/char/tpm/tpm_tis_i2c_cr50.c > > index 77cea5b31c6e4..517d8410d7da0 100644 > > --- a/drivers/char/tpm/tpm_tis_i2c_cr50.c > > +++ b/drivers/char/tpm/tpm_tis_i2c_cr50.c > > @@ -17,6 +17,7 @@ > > */ > > > > #include <linux/acpi.h> > > +#include <linux/bug.h> > > #include <linux/completion.h> > > #include <linux/i2c.h> > > #include <linux/interrupt.h> > > @@ -35,6 +36,7 @@ > > #define TPM_CR50_I2C_MAX_RETRIES 3 /* Max retries due to I2C errors */ > > #define TPM_CR50_I2C_RETRY_DELAY_LO 55 /* Min usecs between retries on I2C */ > > #define TPM_CR50_I2C_RETRY_DELAY_HI 65 /* Max usecs between retries on I2C */ > > +#define TPM_CR50_I2C_DEFAULT_LOC 0 > > > > #define TPM_I2C_ACCESS(l) (0x0000 | ((l) << 4)) > > #define TPM_I2C_STS(l) (0x0001 | ((l) << 4)) > > @@ -286,20 +288,21 @@ static int tpm_cr50_i2c_write(struct tpm_chip *chip, u8 addr, u8 *buffer, > > } > > > > /** > > - * tpm_cr50_check_locality() - Verify TPM locality 0 is active. > > + * tpm_cr50_check_locality() - Verify if required TPM locality is active. > > * @chip: A TPM chip. > > + * @loc: Locality to be verified > > * > > * Return: > > * - 0: Success. > > * - -errno: A POSIX error code. > > */ > > -static int tpm_cr50_check_locality(struct tpm_chip *chip) > > +static int tpm_cr50_check_locality(struct tpm_chip *chip, int loc) > > { > > u8 mask = TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY; > > u8 buf; > > int rc; > > > > - rc = tpm_cr50_i2c_read(chip, TPM_I2C_ACCESS(0), &buf, sizeof(buf)); > > + rc = tpm_cr50_i2c_read(chip, TPM_I2C_ACCESS(loc), &buf, sizeof(buf)); > > if (rc < 0) > > return rc; > > > > @@ -312,48 +315,57 @@ static int tpm_cr50_check_locality(struct tpm_chip *chip) > > /** > > * tpm_cr50_release_locality() - Release TPM locality. > > * @chip: A TPM chip. > > - * @force: Flag to force release if set. > > + * @loc: Locality to be released > > + * > > + * Return: > > + * - 0: Success. > > + * - -errno: A POSIX error code. > > */ > > -static void tpm_cr50_release_locality(struct tpm_chip *chip, bool force) > > +static int tpm_cr50_release_locality(struct tpm_chip *chip, int loc) > > { > > u8 mask = TPM_ACCESS_VALID | TPM_ACCESS_REQUEST_PENDING; > > - u8 addr = TPM_I2C_ACCESS(0); > > + u8 addr = TPM_I2C_ACCESS(loc); > > u8 buf; > > + int rc; > > > > - if (tpm_cr50_i2c_read(chip, addr, &buf, sizeof(buf)) < 0) > > - return; > > + rc = tpm_cr50_i2c_read(chip, addr, &buf, sizeof(buf)); > > + if (rc < 0) > > + return rc; > > > > - if (force || (buf & mask) == mask) { > > + if ((buf & mask) == mask) { > > buf = TPM_ACCESS_ACTIVE_LOCALITY; > > - tpm_cr50_i2c_write(chip, addr, &buf, sizeof(buf)); > > + rc = tpm_cr50_i2c_write(chip, addr, &buf, sizeof(buf)); > > } > > + > > + return rc; > > } > > > > /** > > - * tpm_cr50_request_locality() - Request TPM locality 0. > > + * tpm_cr50_request_locality() - Request TPM locality. > > * @chip: A TPM chip. > > + * @loc: Locality to be requested. > > * > > * Return: > > - * - 0: Success. > > + * - loc: Success. > > * - -errno: A POSIX error code. > > */ > > -static int tpm_cr50_request_locality(struct tpm_chip *chip) > > +static int tpm_cr50_request_locality(struct tpm_chip *chip, int loc) > > { > > u8 buf = TPM_ACCESS_REQUEST_USE; > > unsigned long stop; > > int rc; > > > > - if (!tpm_cr50_check_locality(chip)) > > - return 0; > > + if (!tpm_cr50_check_locality(chip, loc)) > > + return loc; > > > > - rc = tpm_cr50_i2c_write(chip, TPM_I2C_ACCESS(0), &buf, sizeof(buf)); > > + rc = tpm_cr50_i2c_write(chip, TPM_I2C_ACCESS(loc), &buf, sizeof(buf)); > > if (rc < 0) > > return rc; > > > > stop = jiffies + chip->timeout_a; > > do { > > - if (!tpm_cr50_check_locality(chip)) > > - return 0; > > + if (!tpm_cr50_check_locality(chip, loc)) > > + return loc; > > > > msleep(TPM_CR50_TIMEOUT_SHORT_MS); > > } while (time_before(jiffies, stop)); > > @@ -374,7 +386,12 @@ static u8 tpm_cr50_i2c_tis_status(struct tpm_chip *chip) > > { > > u8 buf[4]; > > > > - if (tpm_cr50_i2c_read(chip, TPM_I2C_STS(0), buf, sizeof(buf)) < 0) > > + if (chip->locality < 0){ > > + WARN_ONCE(1, "Incorrect tpm locality value\n"); > > Never ever add WARN() for a success case. It can ultimately crash the whole > system, if panic_on_warn is enabled. > > Since this is a success case, judging from the return value, at most you > should use pr_info() here. ACK. Best Regards, Jan
On Thu, Nov 03, 2022 at 03:54:49PM +0100, Jan Dabros wrote: > Instead of using static functions tpm_cr50_request_locality and > tpm_cr50_release_locality register callbacks from tpm class chip->ops > created for this purpose. > > Signed-off-by: Jan Dabros <jsd@semihalf.com> > --- [ ... ] > #ifdef CONFIG_ACPI > @@ -686,6 +714,7 @@ static int tpm_cr50_i2c_probe(struct i2c_client *client) > u32 vendor; > u8 buf[4]; > int rc; > + int loc; > > if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) > return -ENODEV; > @@ -728,24 +757,30 @@ static int tpm_cr50_i2c_probe(struct i2c_client *client) > TPM_CR50_TIMEOUT_NOIRQ_MS); > } > > - rc = tpm_cr50_request_locality(chip); > - if (rc < 0) { > + loc = tpm_cr50_request_locality(chip, TPM_CR50_I2C_DEFAULT_LOC); > + if (loc < 0) { > dev_err(dev, "Could not request locality\n"); > return rc; As reported by 0-day and Dan Carpenter: return loc; Guenter
diff --git a/drivers/char/tpm/tpm_tis_i2c_cr50.c b/drivers/char/tpm/tpm_tis_i2c_cr50.c index 77cea5b31c6e4..517d8410d7da0 100644 --- a/drivers/char/tpm/tpm_tis_i2c_cr50.c +++ b/drivers/char/tpm/tpm_tis_i2c_cr50.c @@ -17,6 +17,7 @@ */ #include <linux/acpi.h> +#include <linux/bug.h> #include <linux/completion.h> #include <linux/i2c.h> #include <linux/interrupt.h> @@ -35,6 +36,7 @@ #define TPM_CR50_I2C_MAX_RETRIES 3 /* Max retries due to I2C errors */ #define TPM_CR50_I2C_RETRY_DELAY_LO 55 /* Min usecs between retries on I2C */ #define TPM_CR50_I2C_RETRY_DELAY_HI 65 /* Max usecs between retries on I2C */ +#define TPM_CR50_I2C_DEFAULT_LOC 0 #define TPM_I2C_ACCESS(l) (0x0000 | ((l) << 4)) #define TPM_I2C_STS(l) (0x0001 | ((l) << 4)) @@ -286,20 +288,21 @@ static int tpm_cr50_i2c_write(struct tpm_chip *chip, u8 addr, u8 *buffer, } /** - * tpm_cr50_check_locality() - Verify TPM locality 0 is active. + * tpm_cr50_check_locality() - Verify if required TPM locality is active. * @chip: A TPM chip. + * @loc: Locality to be verified * * Return: * - 0: Success. * - -errno: A POSIX error code. */ -static int tpm_cr50_check_locality(struct tpm_chip *chip) +static int tpm_cr50_check_locality(struct tpm_chip *chip, int loc) { u8 mask = TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY; u8 buf; int rc; - rc = tpm_cr50_i2c_read(chip, TPM_I2C_ACCESS(0), &buf, sizeof(buf)); + rc = tpm_cr50_i2c_read(chip, TPM_I2C_ACCESS(loc), &buf, sizeof(buf)); if (rc < 0) return rc; @@ -312,48 +315,57 @@ static int tpm_cr50_check_locality(struct tpm_chip *chip) /** * tpm_cr50_release_locality() - Release TPM locality. * @chip: A TPM chip. - * @force: Flag to force release if set. + * @loc: Locality to be released + * + * Return: + * - 0: Success. + * - -errno: A POSIX error code. */ -static void tpm_cr50_release_locality(struct tpm_chip *chip, bool force) +static int tpm_cr50_release_locality(struct tpm_chip *chip, int loc) { u8 mask = TPM_ACCESS_VALID | TPM_ACCESS_REQUEST_PENDING; - u8 addr = TPM_I2C_ACCESS(0); + u8 addr = TPM_I2C_ACCESS(loc); u8 buf; + int rc; - if (tpm_cr50_i2c_read(chip, addr, &buf, sizeof(buf)) < 0) - return; + rc = tpm_cr50_i2c_read(chip, addr, &buf, sizeof(buf)); + if (rc < 0) + return rc; - if (force || (buf & mask) == mask) { + if ((buf & mask) == mask) { buf = TPM_ACCESS_ACTIVE_LOCALITY; - tpm_cr50_i2c_write(chip, addr, &buf, sizeof(buf)); + rc = tpm_cr50_i2c_write(chip, addr, &buf, sizeof(buf)); } + + return rc; } /** - * tpm_cr50_request_locality() - Request TPM locality 0. + * tpm_cr50_request_locality() - Request TPM locality. * @chip: A TPM chip. + * @loc: Locality to be requested. * * Return: - * - 0: Success. + * - loc: Success. * - -errno: A POSIX error code. */ -static int tpm_cr50_request_locality(struct tpm_chip *chip) +static int tpm_cr50_request_locality(struct tpm_chip *chip, int loc) { u8 buf = TPM_ACCESS_REQUEST_USE; unsigned long stop; int rc; - if (!tpm_cr50_check_locality(chip)) - return 0; + if (!tpm_cr50_check_locality(chip, loc)) + return loc; - rc = tpm_cr50_i2c_write(chip, TPM_I2C_ACCESS(0), &buf, sizeof(buf)); + rc = tpm_cr50_i2c_write(chip, TPM_I2C_ACCESS(loc), &buf, sizeof(buf)); if (rc < 0) return rc; stop = jiffies + chip->timeout_a; do { - if (!tpm_cr50_check_locality(chip)) - return 0; + if (!tpm_cr50_check_locality(chip, loc)) + return loc; msleep(TPM_CR50_TIMEOUT_SHORT_MS); } while (time_before(jiffies, stop)); @@ -374,7 +386,12 @@ static u8 tpm_cr50_i2c_tis_status(struct tpm_chip *chip) { u8 buf[4]; - if (tpm_cr50_i2c_read(chip, TPM_I2C_STS(0), buf, sizeof(buf)) < 0) + if (chip->locality < 0){ + WARN_ONCE(1, "Incorrect tpm locality value\n"); + return 0; + } + + if (tpm_cr50_i2c_read(chip, TPM_I2C_STS(chip->locality), buf, sizeof(buf)) < 0) return 0; return buf[0]; @@ -390,7 +407,12 @@ static void tpm_cr50_i2c_tis_set_ready(struct tpm_chip *chip) { u8 buf[4] = { TPM_STS_COMMAND_READY }; - tpm_cr50_i2c_write(chip, TPM_I2C_STS(0), buf, sizeof(buf)); + if (chip->locality < 0) { + WARN_ONCE(1, "Incorrect tpm locality value\n"); + return; + } + + tpm_cr50_i2c_write(chip, TPM_I2C_STS(chip->locality), buf, sizeof(buf)); msleep(TPM_CR50_TIMEOUT_SHORT_MS); } @@ -420,7 +442,7 @@ static int tpm_cr50_i2c_get_burst_and_status(struct tpm_chip *chip, u8 mask, stop = jiffies + chip->timeout_b; do { - if (tpm_cr50_i2c_read(chip, TPM_I2C_STS(0), buf, sizeof(buf)) < 0) { + if (tpm_cr50_i2c_read(chip, TPM_I2C_STS(chip->locality), buf, sizeof(buf)) < 0) { msleep(TPM_CR50_TIMEOUT_SHORT_MS); continue; } @@ -454,10 +476,15 @@ static int tpm_cr50_i2c_tis_recv(struct tpm_chip *chip, u8 *buf, size_t buf_len) u8 mask = TPM_STS_VALID | TPM_STS_DATA_AVAIL; size_t burstcnt, cur, len, expected; - u8 addr = TPM_I2C_DATA_FIFO(0); + u8 addr = TPM_I2C_DATA_FIFO(chip->locality); u32 status; int rc; + if (chip->locality < 0) { + WARN_ONCE(1, "Incorrect tpm locality value\n"); + return -EINVAL; + } + if (buf_len < TPM_HEADER_SIZE) return -EINVAL; @@ -516,7 +543,6 @@ static int tpm_cr50_i2c_tis_recv(struct tpm_chip *chip, u8 *buf, size_t buf_len) goto out_err; } - tpm_cr50_release_locality(chip, false); return cur; out_err: @@ -524,7 +550,6 @@ static int tpm_cr50_i2c_tis_recv(struct tpm_chip *chip, u8 *buf, size_t buf_len) if (tpm_cr50_i2c_tis_status(chip) & TPM_STS_COMMAND_READY) tpm_cr50_i2c_tis_set_ready(chip); - tpm_cr50_release_locality(chip, false); return rc; } @@ -546,9 +571,10 @@ static int tpm_cr50_i2c_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) u32 status; int rc; - rc = tpm_cr50_request_locality(chip); - if (rc < 0) - return rc; + if (chip->locality < 0) { + WARN_ONCE(1, "Incorrect tpm locality value\n"); + return -EINVAL; + } /* Wait until TPM is ready for a command */ stop = jiffies + chip->timeout_b; @@ -578,7 +604,8 @@ static int tpm_cr50_i2c_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) * that is inserted by tpm_cr50_i2c_write() */ limit = min_t(size_t, burstcnt - 1, len); - rc = tpm_cr50_i2c_write(chip, TPM_I2C_DATA_FIFO(0), &buf[sent], limit); + rc = tpm_cr50_i2c_write(chip, TPM_I2C_DATA_FIFO(chip->locality), + &buf[sent], limit); if (rc < 0) { dev_err(&chip->dev, "Write failed\n"); goto out_err; @@ -599,7 +626,7 @@ static int tpm_cr50_i2c_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) } /* Start the TPM command */ - rc = tpm_cr50_i2c_write(chip, TPM_I2C_STS(0), tpm_go, + rc = tpm_cr50_i2c_write(chip, TPM_I2C_STS(chip->locality), tpm_go, sizeof(tpm_go)); if (rc < 0) { dev_err(&chip->dev, "Start command failed\n"); @@ -612,7 +639,6 @@ static int tpm_cr50_i2c_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) if (tpm_cr50_i2c_tis_status(chip) & TPM_STS_COMMAND_READY) tpm_cr50_i2c_tis_set_ready(chip); - tpm_cr50_release_locality(chip, false); return rc; } @@ -651,6 +677,8 @@ static const struct tpm_class_ops cr50_i2c = { .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, .req_canceled = &tpm_cr50_i2c_req_canceled, + .request_locality = &tpm_cr50_request_locality, + .relinquish_locality = &tpm_cr50_release_locality, }; #ifdef CONFIG_ACPI @@ -686,6 +714,7 @@ static int tpm_cr50_i2c_probe(struct i2c_client *client) u32 vendor; u8 buf[4]; int rc; + int loc; if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) return -ENODEV; @@ -728,24 +757,30 @@ static int tpm_cr50_i2c_probe(struct i2c_client *client) TPM_CR50_TIMEOUT_NOIRQ_MS); } - rc = tpm_cr50_request_locality(chip); - if (rc < 0) { + loc = tpm_cr50_request_locality(chip, TPM_CR50_I2C_DEFAULT_LOC); + if (loc < 0) { dev_err(dev, "Could not request locality\n"); return rc; } /* Read four bytes from DID_VID register */ - rc = tpm_cr50_i2c_read(chip, TPM_I2C_DID_VID(0), buf, sizeof(buf)); + rc = tpm_cr50_i2c_read(chip, TPM_I2C_DID_VID(loc), buf, sizeof(buf)); if (rc < 0) { dev_err(dev, "Could not read vendor id\n"); - tpm_cr50_release_locality(chip, true); + if (tpm_cr50_release_locality(chip, loc)) + dev_err(dev, "Could not release locality\n"); + return rc; + } + + rc = tpm_cr50_release_locality(chip, loc); + if (rc) { + dev_err(dev, "Could not release locality\n"); return rc; } vendor = le32_to_cpup((__le32 *)buf); if (vendor != TPM_CR50_I2C_DID_VID && vendor != TPM_TI50_I2C_DID_VID) { dev_err(dev, "Vendor ID did not match! ID was %08x\n", vendor); - tpm_cr50_release_locality(chip, true); return -ENODEV; } @@ -774,7 +809,6 @@ static void tpm_cr50_i2c_remove(struct i2c_client *client) } tpm_chip_unregister(chip); - tpm_cr50_release_locality(chip, true); } static SIMPLE_DEV_PM_OPS(cr50_i2c_pm, tpm_pm_suspend, tpm_pm_resume);
Instead of using static functions tpm_cr50_request_locality and tpm_cr50_release_locality register callbacks from tpm class chip->ops created for this purpose. Signed-off-by: Jan Dabros <jsd@semihalf.com> --- drivers/char/tpm/tpm_tis_i2c_cr50.c | 106 ++++++++++++++++++---------- 1 file changed, 70 insertions(+), 36 deletions(-)