tree 9f157198f03b7afa7ace7aa3066439055b23d79d
parent c58a14a9ccf0a79bbdafc106a95c080340c00f49
author Cédric Le Goater <clg@kaod.org> 1504122375 +0200
committer Michael Ellerman <mpe@ellerman.id.au> 1504350157 +1000

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>