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powerpc/xive: introduce H_INT_ESB hcall

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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>
This commit is contained in:
Cédric Le Goater
2017-08-30 21:46:15 +02:00
committed by Michael Ellerman
parent c58a14a9cc
commit bed81ee181
4 changed files with 53 additions and 3 deletions
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arch/powerpc/include/asm/xive.h
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@@ -56,6 +56,7 @@ struct xive_irq_data {
#define XIVE_IRQ_FLAG_SHIFT_BUG 0x04
#define XIVE_IRQ_FLAG_MASK_FW 0x08
#define XIVE_IRQ_FLAG_EOI_FW 0x10
#define XIVE_IRQ_FLAG_H_INT_ESB 0x20
#define XIVE_INVALID_CHIP_ID -1