2cb3d041cd
Move to kernel version 5.10 using source from the Yocto Project. 1. Add STX patches for kernel 5.10. 2. Support git source for linux-yocto. 3. Add build_srpm from build-tools/default_build_srpm and modified for git repo from yocto 4. Modify std and rt config files. 5. Build python-perf instead of python3-perf for std kernel. python-perf is needed by tuned-2.8.0-5.el7.noarch. 6. Modify rt spec to build out package kernel-rt-tools and kernel-rt-kvm. 7. Add kernel-5.10.30-x86_64-rt.config.tis_extra and kernel-5.10.30-x86_64.config.tis_extra 8. Add a dist field to avoid undesired rebuilds. 9. Ensure -unsigned package is populated Story: 2008921 Partial-Task: 42519 Signed-off-by: Jackie Huang <jackie.huang@windriver.com> Signed-off-by: Vefa Bicakci <vefa.bicakci@windriver.com> Signed-off-by: Jiping Ma <jiping.ma2@windriver.com> Change-Id: Id1f635302f265826f7ff2860a3bed4b7755b2888
101 lines
3.3 KiB
Diff
101 lines
3.3 KiB
Diff
From 7240ac0b8c98c99adc09a46d577c7dd1e8ca46dd Mon Sep 17 00:00:00 2001
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From: Nayna Jain <nayna@linux.vnet.ibm.com>
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Date: Fri, 10 Nov 2017 17:16:35 -0500
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Subject: [PATCH 08/10] tpm: ignore burstcount to improve tpm_tis send()
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performance
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The TPM burstcount status indicates the number of bytes that can
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be sent to the TPM without causing bus wait states. Effectively,
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it is the number of empty bytes in the command FIFO.
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This patch optimizes the tpm_tis_send_data() function by checking
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the burstcount only once. And if the burstcount is valid, it writes
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all the bytes at once, permitting wait state.
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After this change, performance on a TPM 1.2 with an 8 byte
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burstcount for 1000 extends improved from ~41sec to ~14sec.
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Suggested-by: Ken Goldman <kgold@linux.vnet.ibm.com> in
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conjunction with the TPM Device Driver work group.
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Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
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Acked-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
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Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
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Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
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Signed-off-by: Dongqi Chen <chen.dq@neusoft.com>
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Signed-off-by: Jiping Ma <jiping.ma2@windriver.com>
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---
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drivers/char/tpm/tpm_tis_core.c | 43 ++++++++++++---------------------
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1 file changed, 15 insertions(+), 28 deletions(-)
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diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
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index a2e0395cbe61..2c69fde1e4e5 100644
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--- a/drivers/char/tpm/tpm_tis_core.c
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+++ b/drivers/char/tpm/tpm_tis_core.c
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@@ -330,7 +330,6 @@ static int tpm_tis_send_data(struct tpm_chip *chip, const u8 *buf, size_t len)
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{
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struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
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int rc, status, burstcnt;
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- size_t count = 0;
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bool itpm = priv->flags & TPM_TIS_ITPM_WORKAROUND;
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status = tpm_tis_status(chip);
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@@ -343,36 +342,24 @@ static int tpm_tis_send_data(struct tpm_chip *chip, const u8 *buf, size_t len)
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goto out_err;
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}
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}
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-
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- while (count < len - 1) {
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- burstcnt = get_burstcount(chip);
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- if (burstcnt < 0) {
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- dev_err(&chip->dev, "Unable to read burstcount\n");
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- rc = burstcnt;
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- goto out_err;
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- }
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- burstcnt = min_t(int, burstcnt, len - count - 1);
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- rc = tpm_tis_write_bytes(priv, TPM_DATA_FIFO(priv->locality),
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- burstcnt, buf + count);
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- if (rc < 0)
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- goto out_err;
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-
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- count += burstcnt;
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-
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- if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
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- &priv->int_queue, false) < 0) {
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- rc = -ETIME;
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- goto out_err;
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- }
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- status = tpm_tis_status(chip);
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- if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
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- rc = -EIO;
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- goto out_err;
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- }
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+ /*
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+ * Get the initial burstcount to ensure TPM is ready to
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+ * accept data, even when waiting for burstcount is disabled.
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+ */
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+ burstcnt = get_burstcount(chip);
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+ if (burstcnt < 0) {
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+ dev_err(&chip->dev, "Unable to read burstcount\n");
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+ rc = burstcnt;
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+ goto out_err;
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}
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+ rc = tpm_tis_write_bytes(priv, TPM_DATA_FIFO(priv->locality),
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+ len -1, buf);
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+ if (rc < 0)
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+ goto out_err;
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+
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/* write last byte */
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- rc = tpm_tis_write8(priv, TPM_DATA_FIFO(priv->locality), buf[count]);
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+ rc = tpm_tis_write8(priv, TPM_DATA_FIFO(priv->locality), buf[len-1]);
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if (rc < 0)
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goto out_err;
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--
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2.29.2
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