Cédric Le Goater bed81ee181
powerpc/xive: introduce H_INT_ESB hcall ...
The H_INT_ESB hcall() is used to issue a load or store to the ESB page
instead of using the MMIO pages. This can be used as a workaround on
some HW issues. The OS knows that this hcall should be used on an
interrupt source when the ESB hcall flag is set to 1 in the hcall
H_INT_GET_SOURCE_INFO.
To maintain the frontier between the xive frontend and backend, we
introduce a new xive operation 'esb_rw' to be used in the routines
doing memory accesses on the ESBs.
Signed-off-by: Cédric Le Goater <clg@kaod.org >
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org >
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au >
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bed81ee181