| Message ID | 20220901214610.768645-3-stefanb@linux.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | tpm: Preserve TPM measurement log across kexec (ppc64) | expand |
On Thu, Sep 01, 2022 at 05:46:08PM -0400, Stefan Berger wrote: > Simplify tpm_read_log_of() by moving reusable parts of the code into > an inline function that makes it commonly available so it can be > used also for kexec support. Call the new of_tpm_get_sml_parameters() > function from the TPM Open Firmware driver. > > Signed-off-by: Stefan Berger <stefanb@linux.ibm.com> > Cc: Jarkko Sakkinen <jarkko@kernel.org> > Cc: Jason Gunthorpe <jgg@ziepe.ca> > Cc: Rob Herring <robh+dt@kernel.org> > Cc: Frank Rowand <frowand.list@gmail.com> > Reviewed-by: Mimi Zohar <zohar@linux.ibm.com> > Tested-by: Nageswara R Sastry <rnsastry@linux.ibm.com> > Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> > Tested-by: Coiby Xu <coxu@redhat.com> > > --- > v7: > - Added original comment back into inlined function > > v4: > - converted to inline function > --- > drivers/char/tpm/eventlog/of.c | 31 +++++------------------------ > include/linux/tpm.h | 36 ++++++++++++++++++++++++++++++++++ > 2 files changed, 41 insertions(+), 26 deletions(-) > > diff --git a/drivers/char/tpm/eventlog/of.c b/drivers/char/tpm/eventlog/of.c > index a9ce66d09a75..f9462d19632e 100644 > --- a/drivers/char/tpm/eventlog/of.c > +++ b/drivers/char/tpm/eventlog/of.c > @@ -12,6 +12,7 @@ > > #include <linux/slab.h> > #include <linux/of.h> > +#include <linux/tpm.h> > #include <linux/tpm_eventlog.h> > > #include "../tpm.h" > @@ -20,11 +21,10 @@ > int tpm_read_log_of(struct tpm_chip *chip) > { > struct device_node *np; > - const u32 *sizep; > - const u64 *basep; > struct tpm_bios_log *log; > u32 size; > u64 base; > + int ret; > > log = &chip->log; > if (chip->dev.parent && chip->dev.parent->of_node) > @@ -35,30 +35,9 @@ int tpm_read_log_of(struct tpm_chip *chip) > if (of_property_read_bool(np, "powered-while-suspended")) > chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED; > > - sizep = of_get_property(np, "linux,sml-size", NULL); > - basep = of_get_property(np, "linux,sml-base", NULL); > - if (sizep == NULL && basep == NULL) > - return -ENODEV; > - if (sizep == NULL || basep == NULL) > - return -EIO; > - > - /* > - * For both vtpm/tpm, firmware has log addr and log size in big > - * endian format. But in case of vtpm, there is a method called > - * sml-handover which is run during kernel init even before > - * device tree is setup. This sml-handover function takes care > - * of endianness and writes to sml-base and sml-size in little > - * endian format. For this reason, vtpm doesn't need conversion > - * but physical tpm needs the conversion. > - */ > - if (of_property_match_string(np, "compatible", "IBM,vtpm") < 0 && > - of_property_match_string(np, "compatible", "IBM,vtpm20") < 0) { > - size = be32_to_cpup((__force __be32 *)sizep); > - base = be64_to_cpup((__force __be64 *)basep); > - } else { > - size = *sizep; > - base = *basep; > - } > + ret = of_tpm_get_sml_parameters(np, &base, &size); > + if (ret < 0) > + return ret; > > if (size == 0) { > dev_warn(&chip->dev, "%s: Event log area empty\n", __func__); > diff --git a/include/linux/tpm.h b/include/linux/tpm.h > index dfeb25a0362d..6356baaa1393 100644 > --- a/include/linux/tpm.h > +++ b/include/linux/tpm.h > @@ -460,4 +460,40 @@ static inline struct tpm_chip *tpm_default_chip(void) > return NULL; > } > #endif > + > +#ifdef CONFIG_OF > +static inline int of_tpm_get_sml_parameters(struct device_node *np, > + u64 *base, u32 *size) > +{ > + const u32 *sizep; > + const u64 *basep; > + > + sizep = of_get_property(np, "linux,sml-size", NULL); > + basep = of_get_property(np, "linux,sml-base", NULL); > + if (sizep == NULL && basep == NULL) > + return -ENODEV; > + if (sizep == NULL || basep == NULL) > + return -EIO; > + > + /* > + * For both vtpm/tpm, firmware has log addr and log size in big > + * endian format. But in case of vtpm, there is a method called > + * sml-handover which is run during kernel init even before > + * device tree is setup. This sml-handover function takes care > + * of endianness and writes to sml-base and sml-size in little > + * endian format. For this reason, vtpm doesn't need conversion > + * but physical tpm needs the conversion. > + */ > + if (of_property_match_string(np, "compatible", "IBM,vtpm") < 0 && > + of_property_match_string(np, "compatible", "IBM,vtpm20") < 0) { > + *size = be32_to_cpup((__force __be32 *)sizep); > + *base = be64_to_cpup((__force __be64 *)basep); > + } else { > + *size = *sizep; > + *base = *basep; > + } > + return 0; > +} > +#endif > + > #endif > -- > 2.35.1 > Acked-by: Jarkko Sakkinen <jarkko@kernel.org> BR, Jarkko
diff --git a/drivers/char/tpm/eventlog/of.c b/drivers/char/tpm/eventlog/of.c index a9ce66d09a75..f9462d19632e 100644 --- a/drivers/char/tpm/eventlog/of.c +++ b/drivers/char/tpm/eventlog/of.c @@ -12,6 +12,7 @@ #include <linux/slab.h> #include <linux/of.h> +#include <linux/tpm.h> #include <linux/tpm_eventlog.h> #include "../tpm.h" @@ -20,11 +21,10 @@ int tpm_read_log_of(struct tpm_chip *chip) { struct device_node *np; - const u32 *sizep; - const u64 *basep; struct tpm_bios_log *log; u32 size; u64 base; + int ret; log = &chip->log; if (chip->dev.parent && chip->dev.parent->of_node) @@ -35,30 +35,9 @@ int tpm_read_log_of(struct tpm_chip *chip) if (of_property_read_bool(np, "powered-while-suspended")) chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED; - sizep = of_get_property(np, "linux,sml-size", NULL); - basep = of_get_property(np, "linux,sml-base", NULL); - if (sizep == NULL && basep == NULL) - return -ENODEV; - if (sizep == NULL || basep == NULL) - return -EIO; - - /* - * For both vtpm/tpm, firmware has log addr and log size in big - * endian format. But in case of vtpm, there is a method called - * sml-handover which is run during kernel init even before - * device tree is setup. This sml-handover function takes care - * of endianness and writes to sml-base and sml-size in little - * endian format. For this reason, vtpm doesn't need conversion - * but physical tpm needs the conversion. - */ - if (of_property_match_string(np, "compatible", "IBM,vtpm") < 0 && - of_property_match_string(np, "compatible", "IBM,vtpm20") < 0) { - size = be32_to_cpup((__force __be32 *)sizep); - base = be64_to_cpup((__force __be64 *)basep); - } else { - size = *sizep; - base = *basep; - } + ret = of_tpm_get_sml_parameters(np, &base, &size); + if (ret < 0) + return ret; if (size == 0) { dev_warn(&chip->dev, "%s: Event log area empty\n", __func__); diff --git a/include/linux/tpm.h b/include/linux/tpm.h index dfeb25a0362d..6356baaa1393 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -460,4 +460,40 @@ static inline struct tpm_chip *tpm_default_chip(void) return NULL; } #endif + +#ifdef CONFIG_OF +static inline int of_tpm_get_sml_parameters(struct device_node *np, + u64 *base, u32 *size) +{ + const u32 *sizep; + const u64 *basep; + + sizep = of_get_property(np, "linux,sml-size", NULL); + basep = of_get_property(np, "linux,sml-base", NULL); + if (sizep == NULL && basep == NULL) + return -ENODEV; + if (sizep == NULL || basep == NULL) + return -EIO; + + /* + * For both vtpm/tpm, firmware has log addr and log size in big + * endian format. But in case of vtpm, there is a method called + * sml-handover which is run during kernel init even before + * device tree is setup. This sml-handover function takes care + * of endianness and writes to sml-base and sml-size in little + * endian format. For this reason, vtpm doesn't need conversion + * but physical tpm needs the conversion. + */ + if (of_property_match_string(np, "compatible", "IBM,vtpm") < 0 && + of_property_match_string(np, "compatible", "IBM,vtpm20") < 0) { + *size = be32_to_cpup((__force __be32 *)sizep); + *base = be64_to_cpup((__force __be64 *)basep); + } else { + *size = *sizep; + *base = *basep; + } + return 0; +} +#endif + #endif