Messages in this thread | | | Date | Wed, 18 Jan 2023 08:49:30 -0600 | Subject | Re: [PATCH v2 2/2] tpm: Add reserved memory event log | From | Eddie James <> |
| |
On 1/18/23 07:27, Stefan Berger wrote: > > > On 1/13/23 11:10, Eddie James wrote: >> Some platforms may desire to pass the event log up to linux in the > > Which platforms are these that work like this?
Platforms booting from U-Boot without EFI. So at the moment, IBM's OpenBMC systems hope to use this.
Thanks,
Eddie
> > Stefan > >> form of a reserved memory region. Add support for this in the TPM >> core to find the reserved memory region and map it. >> >> Signed-off-by: Eddie James <eajames@linux.ibm.com> >> --- >> drivers/char/tpm/eventlog/of.c | 38 +++++++++++++++++++++++++++++++++- >> 1 file changed, 37 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/char/tpm/eventlog/of.c >> b/drivers/char/tpm/eventlog/of.c >> index 741ab2204b11..c815cadf00a4 100644 >> --- a/drivers/char/tpm/eventlog/of.c >> +++ b/drivers/char/tpm/eventlog/of.c >> @@ -12,12 +12,48 @@ >> #include <linux/device.h> >> #include <linux/slab.h> >> +#include <linux/io.h> >> +#include <linux/ioport.h> >> #include <linux/of.h> >> +#include <linux/of_address.h> >> +#include <linux/of_reserved_mem.h> >> #include <linux/tpm_eventlog.h> >> #include "../tpm.h" >> #include "common.h" >> +static int tpm_read_log_memory_region(struct tpm_chip *chip) >> +{ >> + struct device_node *node; >> + struct resource res; >> + int rc; >> + >> + node = of_parse_phandle(chip->dev.parent->of_node, >> "memory-region", 0); >> + if (!node) { >> + dev_info(&chip->dev, "no phandle\n"); >> + return -ENODEV; >> + } >> + >> + rc = of_address_to_resource(node, 0, &res); >> + of_node_put(node); >> + if (rc) { >> + dev_info(&chip->dev, "no mem\n"); >> + return rc; >> + } >> + >> + chip->log.bios_event_log = devm_memremap(&chip->dev, res.start, >> resource_size(&res), >> + MEMREMAP_WB); >> + if (!chip->log.bios_event_log) { >> + dev_info(&chip->dev, "err memremap\n"); >> + return -ENOMEM; >> + } >> + >> + chip->log.bios_event_log_end = chip->log.bios_event_log + >> resource_size(&res); >> + >> + return chip->flags & TPM_CHIP_FLAG_TPM2 ? >> EFI_TCG2_EVENT_LOG_FORMAT_TCG_2 : >> + EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2; >> +} >> + >> int tpm_read_log_of(struct tpm_chip *chip) >> { >> struct device_node *np; >> @@ -39,7 +75,7 @@ int tpm_read_log_of(struct tpm_chip *chip) >> 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; >> + return tpm_read_log_memory_region(chip); >> if (sizep == NULL || basep == NULL) >> return -EIO;
| |