On 7/10/22 23:04, Jarkko Sakkinen wrote:
On Wed, Jul 06, 2022 at 11:23:27AM -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@xxxxxxxxxxxxx> Cc: Jarkko Sakkinen <jarkko@xxxxxxxxxx> Cc: Jason Gunthorpe <jgg@xxxxxxxx> Cc: Rob Herring <robh+dt@xxxxxxxxxx> Cc: Frank Rowand <frowand.list@xxxxxxxxx> --- v4: - converted to inline function --- drivers/char/tpm/eventlog/of.c | 31 +++++-------------------------- include/linux/tpm.h | 27 +++++++++++++++++++++++++++ 2 files changed, 32 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. - */
Jarkko,can I apply your R-b tag after putting this lost comment back into the inline function?
Stefan
- 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..b3dff255bc58 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -460,4 +460,31 @@ 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; + + 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 -- 2.35.1Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx> BR, Jarkko _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
