As per MP service specification, EDK2 is allowed to specify the mode in which a 'func' routine should be executed on APs. `SingleThread` sets to 'true' meaning to execute the function one by one (serially) or sets to 'false' meaning to execute the function simultaneously. MP service API `StartupAllAPs` was designed to pass such options as part of function argument. But another MP service API `StartupAllCPUs` doesn't specify any such requirement. Running the `func` simultaneously on APs results in a coherency issue (hang while executing `func`) due to lack of acquiring a spin lock while accessing common data structure in multiprocessor environment. BUG=b:199246420 Change-Id: Ia95d11408f663212fd40daa9fd9b0881a07f1ce7 Signed-off-by: Subrata Banik <subrata.banik@intel.com> Signed-off-by: Ronak Kanabar <ronak.kanabar@intel.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/57343 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Maulik V Vaghela <maulik.v.vaghela@intel.com> Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org> |
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| .. | ||
| dptf | ||
| fsp1_1 | ||
| fsp2_0 | ||
| gma | ||
| i210 | ||
| ish | ||
| mipi_camera | ||
| pmc_mux | ||
| ptt | ||
| soundwire | ||
| usb4/retimer | ||