tpm: Add reserved memory event log
Some platforms may desire to pass the event log up to Linux in the form of a reserved memory region. In particular, this is desirable for embedded systems or baseboard management controllers (BMCs) booting with U-Boot. IBM OpenBMC BMCs will be the first user. Add support for the reserved memory in the TPM core to find the region and map it. Signed-off-by: Eddie James <eajames@linux.ibm.com> [jarkko: removed spurious dev_info()'s from tpm_read_log_memory_region()] Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> [yang: return -ENOMEM when devm_memremap() fails] Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
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@ -12,12 +12,42 @@
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_reserved_mem.h>
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#include <linux/tpm_eventlog.h>
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#include "../tpm.h"
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#include "common.h"
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static int tpm_read_log_memory_region(struct tpm_chip *chip)
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{
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struct device_node *node;
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struct resource res;
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int rc;
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node = of_parse_phandle(chip->dev.parent->of_node, "memory-region", 0);
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if (!node)
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return -ENODEV;
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rc = of_address_to_resource(node, 0, &res);
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of_node_put(node);
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if (rc)
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return rc;
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chip->log.bios_event_log = devm_memremap(&chip->dev, res.start, resource_size(&res),
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MEMREMAP_WB);
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if (IS_ERR(chip->log.bios_event_log))
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return -ENOMEM;
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chip->log.bios_event_log_end = chip->log.bios_event_log + resource_size(&res);
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return chip->flags & TPM_CHIP_FLAG_TPM2 ? EFI_TCG2_EVENT_LOG_FORMAT_TCG_2 :
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EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
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}
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int tpm_read_log_of(struct tpm_chip *chip)
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{
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struct device_node *np;
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@ -39,7 +69,7 @@ int tpm_read_log_of(struct tpm_chip *chip)
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sizep = of_get_property(np, "linux,sml-size", NULL);
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basep = of_get_property(np, "linux,sml-base", NULL);
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if (sizep == NULL && basep == NULL)
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return -ENODEV;
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return tpm_read_log_memory_region(chip);
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if (sizep == NULL || basep == NULL)
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return -EIO;
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