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SubjectRe: [PATCH v7 15/17] tpm: introduce tpm_chip_start() and tpm_chip_stop()
From
Date
On 11/13/18 1:36 PM, Jarkko Sakkinen wrote:
> Encapsulate power gating and locality functionality to tpm_chip_start()
> and tpm_chip_stop() in order to clean up the branching mess in
> tpm_transmit().


I ran the vtpm proxy test suite on this series and got this error when
running it with 'make check-j5'
(https://github.com/stefanberger/linux-vtpm-tests).

It's was actually difficult to hit this bug since I ran it with -j1 ,
-j2 and so on before.


[ 3003.838138] BUG: unable to handle kernel NULL pointer dereference at
0000000000000000
[ 3003.838806] PGD 0 P4D 0
[ 3003.838806] Oops: 0010 [#1] SMP PTI
[ 3003.840394] CPU: 3 PID: 111 Comm: kworker/3:1 Not tainted 4.20.0-rc2+ #6
[ 3003.840394] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS rel-1.11.0-50-g14221cd-dirty-20181018_164544-sbct-4.pok.ibm.com
04/01/2014
[ 3003.840394] Workqueue: tpm-vtpm vtpm_proxy_work
[ 3003.840394] RIP: 0010:          (null)
[ 3003.840394] Code: Bad RIP value.
[ 3003.840394] RSP: 0018:ffffa6e6816d7e10 EFLAGS: 00010246
[ 3003.840394] RAX: 00000000ffffffe0 RBX: ffff9698077ad000 RCX:
0000000000000006
[ 3003.840394] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
ffff9698077ad000
[ 3003.840394] RBP: ffff9698077ad000 R08: fffff59bc6172d08 R09:
0000000000000000
[ 3003.840394] R10: 0000000000000000 R11: 0000000000000000 R12:
ffff9698b78f0700
[ 3003.840394] R13: ffff9698b78fbc00 R14: 0000000000000000 R15:
ffff9697f8ea10f8
[ 3003.840394] FS:  0000000000000000(0000) GS:ffff9698b78c0000(0000)
knlGS:0000000000000000
[ 3003.840394] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3003.840394] CR2: ffffffffffffffd6 CR3: 0000000190606000 CR4:
00000000000006e0
[ 3003.840394] Call Trace:
[ 3003.840394]  ? tpm_chip_start+0xb8/0xe0
[ 3003.840394]  ? tpm_chip_register+0x15/0x240
[ 3003.840394]  ? vtpm_proxy_work+0x15/0x30
[ 3003.840394]  ? process_one_work+0x237/0x5c0
[ 3003.840394]  ? worker_thread+0x1d5/0x390
[ 3003.840394]  ? process_one_work+0x5c0/0x5c0
[ 3003.840394]  ? kthread+0x11e/0x140
[ 3003.840394]  ? kthread_park+0x90/0x90
[ 3003.840394]  ? ret_from_fork+0x3a/0x50
[ 3003.840394] Modules linked in: xt_CHECKSUM ipt_MASQUERADE tun
nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_rpfilter
ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_nat
ebtable_broute bridge stp llc ip6table_nat nf_nat_ipv6 ip6table_mangle
ip6table_raw ip6table_security iptable_nat nf_nat_ipv4 nf_nat
nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c iptable_mangle
iptable_raw iptable_security ebtable_filter ebtables ip6table_filter
ip6_tables sunrpc virtio_gpu ttm drm_kms_helper drm joydev syscopyarea
sysfillrect sysimgblt pcspkr virtio_balloon i2c_piix4 fb_sys_fops
virtio_net net_failover virtio_console failover virtio_blk crc32c_intel
virtio_pci serio_raw ata_generic virtio_ring virtio pata_acpi floppy
qemu_fw_cfg
[ 3003.840394] CR2: 0000000000000000
[ 3003.840394] ---[ end trace 29e5990b605a7ccb ]---
[ 3003.840394] RIP: 0010:          (null)
[ 3003.840394] Code: Bad RIP value.
[ 3003.840394] RSP: 0018:ffffa6e6816d7e10 EFLAGS: 00010246
[ 3003.840394] RAX: 00000000ffffffe0 RBX: ffff9698077ad000 RCX:
0000000000000006
[ 3003.840394] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
ffff9698077ad000
[ 3003.840394] RBP: ffff9698077ad000 R08: fffff59bc6172d08 R09:
0000000000000000
[ 3003.840394] R10: 0000000000000000 R11: 0000000000000000 R12:
ffff9698b78f0700
[ 3003.840394] R13: ffff9698b78fbc00 R14: 0000000000000000 R15:
ffff9697f8ea10f8
[ 3003.840394] FS:  0000000000000000(0000) GS:ffff9698b78c0000(0000)
knlGS:0000000000000000
[ 3003.840394] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3003.840394] CR2: ffffffffffffffd6 CR3: 0000000190606000 CR4:
00000000000006e0
[ 3003.840394] BUG: sleeping function called from invalid context at
./include/linux/percpu-rwsem.h:34
[ 3003.840394] in_atomic(): 0, irqs_disabled(): 1, pid: 111, name:
kworker/3:1
[ 3003.840394] INFO: lockdep is turned off.
[ 3003.840394] irq event stamp: 165206
[ 3003.840394] hardirqs last  enabled at (165205): [<ffffffff8b220113>]
free_unref_page+0xf3/0x1f0
[ 3003.840394] hardirqs last disabled at (165206): [<ffffffff8b0019ee>]
trace_hardirqs_off_thunk+0x1a/0x1c
[ 3003.840394] softirqs last  enabled at (165182): [<ffffffff8b785e01>]
peernet2id+0x41/0x50
[ 3003.840394] softirqs last disabled at (165180): [<ffffffff8b785de2>]
peernet2id+0x22/0x50
[ 3003.840394] CPU: 3 PID: 111 Comm: kworker/3:1 Tainted: G D          
4.20.0-rc2+ #6
[ 3003.840394] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS rel-1.11.0-50-g14221cd-dirty-20181018_164544-sbct-4.pok.ibm.com
04/01/2014
[ 3003.840394] Workqueue: tpm-vtpm vtpm_proxy_work
[ 3003.840394] Call Trace:
[ 3003.840394]  dump_stack+0x67/0x9b
[ 3003.840394]  ___might_sleep+0x149/0x230
[ 3003.840394]  exit_signals+0x20/0x210
[ 3003.840394]  ? worker_thread+0x1d5/0x390
[ 3003.840394]  do_exit+0xa0/0xc70
[ 3003.840394]  ? process_one_work+0x5c0/0x5c0
[ 3003.840394]  ? kthread+0x11e/0x140
[ 3003.840394]  rewind_stack_do_exit+0x17/0x20
[ 3004.389582] tpm tpm1803: tpm_try_transmit: tpm_send: error -14


>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> ---
> drivers/char/tpm/tpm-chip.c | 110 +++++++++++++++++++++++++++++++
> drivers/char/tpm/tpm-interface.c | 87 +-----------------------
> drivers/char/tpm/tpm.h | 2 +
> 3 files changed, 115 insertions(+), 84 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
> index 157505b0f755..65f1561eba81 100644
> --- a/drivers/char/tpm/tpm-chip.c
> +++ b/drivers/char/tpm/tpm-chip.c
> @@ -37,6 +37,116 @@ struct class *tpm_class;
> struct class *tpmrm_class;
> dev_t tpm_devt;
>
> +static int tpm_request_locality(struct tpm_chip *chip, unsigned int flags)
> +{
> + int rc;
> +
> + if (flags & TPM_TRANSMIT_NESTED)
> + return 0;
> +
> + if (!chip->ops->request_locality)
> + return 0;
> +
> + rc = chip->ops->request_locality(chip, 0);
> + if (rc < 0)
> + return rc;
> +
> + chip->locality = rc;
> + return 0;
> +}
> +
> +static void tpm_relinquish_locality(struct tpm_chip *chip, unsigned int flags)
> +{
> + int rc;
> +
> + if (flags & TPM_TRANSMIT_NESTED)
> + return;
> +
> + if (!chip->ops->relinquish_locality)
> + return;
> +
> + rc = chip->ops->relinquish_locality(chip, chip->locality);
> + if (rc)
> + dev_err(&chip->dev, "%s: : error %d\n", __func__, rc);
> +
> + chip->locality = -1;
> +}
> +
> +static int tpm_cmd_ready(struct tpm_chip *chip, unsigned int flags)
> +{
> + if (flags & TPM_TRANSMIT_NESTED)
> + return 0;
> +
> + if (!chip->ops->cmd_ready)
> + return 0;
> +
> + return chip->ops->cmd_ready(chip);
> +}
> +
> +static int tpm_go_idle(struct tpm_chip *chip, unsigned int flags)
> +{
> + if (flags & TPM_TRANSMIT_NESTED)
> + return 0;
> +
> + if (!chip->ops->go_idle)
> + return 0;
> +
> + return chip->ops->go_idle(chip);
> +}
> +
> +/**
> + * tpm_chip_start() - power on the TPM
> + * @chip: a TPM chip to use
> + * @flags: TPM transmit flags
> + *
> + * Return:
> + * * The response length - OK
> + * * -errno - A system error
> + */
> +int tpm_chip_start(struct tpm_chip *chip, unsigned int flags)
> +{
> + int ret;
> +
> + if (chip->ops->clk_enable)
> + chip->ops->clk_enable(chip, true);
> +
> + if (chip->locality == -1) {
> + ret = tpm_request_locality(chip, flags);
> + if (ret) {
> + chip->ops->clk_enable(chip, false);
> + return ret;
> + }
> + }
> +
> + ret = tpm_cmd_ready(chip, flags);
> + if (ret) {
> + tpm_relinquish_locality(chip, flags);
> + if (chip->ops->clk_enable)
> + chip->ops->clk_enable(chip, false);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * tpm_chip_stop() - power off the TPM
> + * @chip: a TPM chip to use
> + * @flags: TPM transmit flags
> + *
> + * Return:
> + * * The response length - OK
> + * * -errno - A system error
> + */
> +void tpm_chip_stop(struct tpm_chip *chip, unsigned int flags)
> +{
> + tpm_go_idle(chip, flags);
> + tpm_relinquish_locality(chip, flags);
> + if (chip->ops->clk_enable)
> + chip->ops->clk_enable(chip, false);
> +}
> +
> +
> /**
> * tpm_try_get_ops() - Get a ref to the tpm_chip
> * @chip: Chip to ref
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 5865b9671d20..888c9923fca1 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -62,64 +62,6 @@ unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
> }
> EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
>
> -static int tpm_request_locality(struct tpm_chip *chip, unsigned int flags)
> -{
> - int rc;
> -
> - if (flags & TPM_TRANSMIT_NESTED)
> - return 0;
> -
> - if (!chip->ops->request_locality)
> - return 0;
> -
> - rc = chip->ops->request_locality(chip, 0);
> - if (rc < 0)
> - return rc;
> -
> - chip->locality = rc;
> -
> - return 0;
> -}
> -
> -static void tpm_relinquish_locality(struct tpm_chip *chip, unsigned int flags)
> -{
> - int rc;
> -
> - if (flags & TPM_TRANSMIT_NESTED)
> - return;
> -
> - if (!chip->ops->relinquish_locality)
> - return;
> -
> - rc = chip->ops->relinquish_locality(chip, chip->locality);
> - if (rc)
> - dev_err(&chip->dev, "%s: : error %d\n", __func__, rc);
> -
> - chip->locality = -1;
> -}
> -
> -static int tpm_cmd_ready(struct tpm_chip *chip, unsigned int flags)
> -{
> - if (flags & TPM_TRANSMIT_NESTED)
> - return 0;
> -
> - if (!chip->ops->cmd_ready)
> - return 0;
> -
> - return chip->ops->cmd_ready(chip);
> -}
> -
> -static int tpm_go_idle(struct tpm_chip *chip, unsigned int flags)
> -{
> - if (flags & TPM_TRANSMIT_NESTED)
> - return 0;
> -
> - if (!chip->ops->go_idle)
> - return 0;
> -
> - return chip->ops->go_idle(chip);
> -}
> -
> static ssize_t tpm_try_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz,
> unsigned int flags)
> {
> @@ -212,7 +154,6 @@ ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz,
> /* space for header and handles */
> u8 save[TPM_HEADER_SIZE + 3*sizeof(u32)];
> unsigned int delay_msec = TPM2_DURATION_SHORT;
> - bool has_locality = false;
> u32 rc = 0;
> ssize_t ret;
> const size_t save_size = min(sizeof(save), bufsiz);
> @@ -227,34 +168,12 @@ ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz,
> memcpy(save, buf, save_size);
>
> for (;;) {
> - if (chip->ops->clk_enable != NULL)
> - chip->ops->clk_enable(chip, true);
> -
> - if (chip->locality == -1) {
> - ret = tpm_request_locality(chip, flags);
> - if (ret)
> - goto out_locality;
> - has_locality = true;
> - }
> -
> - ret = tpm_cmd_ready(chip, flags);
> + ret = tpm_chip_start(chip, flags);
> if (ret)
> - goto out_locality;
> -
> + return ret;
> ret = tpm_try_transmit(chip, buf, bufsiz, flags);
> + tpm_chip_stop(chip, flags);
>
> - /* This may fail but do not override ret. */
> - tpm_go_idle(chip, flags);
> -
> -out_locality:
> - if (has_locality)
> - tpm_relinquish_locality(chip, flags);
> -
> - if (chip->ops->clk_enable != NULL)
> - chip->ops->clk_enable(chip, false);
> -
> - if (ret < 0)
> - break;
> rc = be32_to_cpu(header->return_code);
> if (rc != TPM2_RC_RETRY && rc != TPM2_RC_TESTING)
> break;
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index c7c06de651a0..c42a75710b70 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -523,6 +523,8 @@ static inline void tpm_msleep(unsigned int delay_msec)
> delay_msec * 1000);
> };
>
> +int tpm_chip_start(struct tpm_chip *chip, unsigned int flags);
> +void tpm_chip_stop(struct tpm_chip *chip, unsigned int flags);
> struct tpm_chip *tpm_find_get_ops(struct tpm_chip *chip);
> __must_check int tpm_try_get_ops(struct tpm_chip *chip);
> void tpm_put_ops(struct tpm_chip *chip);


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