On Tue, Nov 13, 2018 at 05:34:54PM -0500, Stefan Berger wrote: > 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@xxxxxxxxxxxxxxx> > > --- > > 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); > > Thank you for the feedback. I'll try to reproduce this myself. /Jarkko
