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ffbb1705a3
Hotplug events were previously delivered using an EPOW interrupt and were queued by linux guests into a circular buffer. For traditional EPOW events like shutdown/resets, this isn't an issue, but for hotplug events there are cases where this buffer can be exhausted, resulting in the loss of hotplug events, resets, etc. Newer-style hotplug event are delivered using a dedicated event source. We enable this in supported guests by adding standard an additional event source in the guest device-tree via /event-sources, and, if the guest advertises support for the newer-style hotplug events, using the corresponding interrupt to signal the available of hotplug/unplug events. Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
68 lines
2.6 KiB
C
68 lines
2.6 KiB
C
/*
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* QEMU SPAPR Option/Architecture Vector Definitions
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*
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* Each architecture option is organized/documented by the following
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* in LoPAPR 1.1, Table 244:
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*
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* <vector number>: the bit-vector in which the option is located
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* <vector byte>: the byte offset of the vector entry
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* <vector bit>: the bit offset within the vector entry
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*
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* where each vector entry can be one or more bytes.
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*
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* Firmware expects a somewhat literal encoding of this bit-vector
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* structure, where each entry is stored in little-endian so that the
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* byte ordering reflects that of the documentation, but where each bit
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* offset is from "left-to-right" in the traditional representation of
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* a byte value where the MSB is the left-most bit. Thus, each
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* individual byte encodes the option bits in reverse order of the
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* documented bit.
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*
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* These definitions/helpers attempt to abstract away this internal
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* representation so that we can define/set/test for individual option
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* bits using only the documented values. This is done mainly by relying
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* on a bitmap to approximate the documented "bit-vector" structure and
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* handling conversations to-from the internal representation under the
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* covers.
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*
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* Copyright IBM Corp. 2016
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*
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* Authors:
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* Michael Roth <mdroth@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef _SPAPR_OVEC_H
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#define _SPAPR_OVEC_H
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#include "cpu.h"
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typedef struct sPAPROptionVector sPAPROptionVector;
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#define OV_BIT(byte, bit) ((byte - 1) * BITS_PER_BYTE + bit)
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/* option vector 5 */
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#define OV5_DRCONF_MEMORY OV_BIT(2, 2)
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#define OV5_FORM1_AFFINITY OV_BIT(5, 0)
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#define OV5_HP_EVT OV_BIT(6, 5)
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/* interfaces */
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sPAPROptionVector *spapr_ovec_new(void);
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sPAPROptionVector *spapr_ovec_clone(sPAPROptionVector *ov_orig);
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void spapr_ovec_intersect(sPAPROptionVector *ov,
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sPAPROptionVector *ov1,
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sPAPROptionVector *ov2);
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bool spapr_ovec_diff(sPAPROptionVector *ov,
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sPAPROptionVector *ov_old,
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sPAPROptionVector *ov_new);
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void spapr_ovec_cleanup(sPAPROptionVector *ov);
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void spapr_ovec_set(sPAPROptionVector *ov, long bitnr);
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void spapr_ovec_clear(sPAPROptionVector *ov, long bitnr);
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bool spapr_ovec_test(sPAPROptionVector *ov, long bitnr);
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sPAPROptionVector *spapr_ovec_parse_vector(target_ulong table_addr, int vector);
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int spapr_ovec_populate_dt(void *fdt, int fdt_offset,
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sPAPROptionVector *ov, const char *name);
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#endif /* !defined (_SPAPR_OVEC_H) */
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