Re: [tpmdd-devel] [PATCH v2] tpm_tis: fix stall after iowrite*()s

On 8/15/2017 4:13 PM, Haris Okanovic wrote: ioread8() operations to TPM MMIO addresses can stall the cpu when immediately following a sequence of iowrite*()'s to the same region. For example, cyclitest measures ~400us latency spikes when a non-RT usermode application communicates with an

Re: [tpmdd-devel] [PATCH] tpm: improve tpm_tis send() performance by ignoring burstcount

On 8/14/2017 6:10 AM, Jarkko Sakkinen wrote: Nuvoton, ST Micro, and Infineon confirmed that the TPM empties a byte from the FIFO in under 1 usec. So, even with a static burst count, the entire FIFO would empty in under 10 usec. Does this break anything lets say in a decade time frame? If it

Re: [tpmdd-devel] [PATCH] tpm: improve tpm_tis send() performance by ignoring burstcount

On Tue, 15 Aug 2017 18:02:57 -0400 Ken Goldman wrote: > On 8/13/2017 7:53 PM, msuchanek wrote: > > About 500 out of 700 mainboards sold today has a PS/2 port which is > > probably due to prevalence of legacy devices and usbhid limitations. > > > > Similarily many