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freebsd-skq/usr.sbin/bhyve/pci_emul.h
grehan 8ade7383ca Fix pci-passthru MSI issues with OpenBSD guests 
- Return 2 x 16-bit registers in the correct byte order
 for a 4-byte read that spans the CMD/STATUS register.
  This reversal was hiding the capabilities-list, which prevented
 the MSI capability from being found for XHCI passthru.

- Reorganize MSI/MSI-x config writes so that a 4-byte write at the
 capability offset would have the read-only portion skipped.
  This prevented MSI interrupts from being enabled.

 Reported and extensively tested by Anatoli (me at anatoli dot ws)

PR:	245392
Reported by:	Anatoli (me at anatoli dot ws)
Reviewed by:	jhb (bhyve)
Approved by:	jhb, bz (mentor)
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D24951
2020-05-25 06:25:31 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2011 NetApp, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _PCI_EMUL_H_
#define _PCI_EMUL_H_
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/kernel.h>
#include <sys/_pthreadtypes.h>
#include <dev/pci/pcireg.h>
#include <assert.h>
#define PCI_BARMAX PCIR_MAX_BAR_0 /* BAR registers in a Type 0 header */
struct vmctx;
struct pci_devinst;
struct memory_region;
struct vm_snapshot_meta;
struct pci_devemu {
char *pe_emu; /* Name of device emulation */
/* instance creation */
int (*pe_init)(struct vmctx *, struct pci_devinst *,
char *opts);
/* ACPI DSDT enumeration */
void (*pe_write_dsdt)(struct pci_devinst *);
/* config space read/write callbacks */
int (*pe_cfgwrite)(struct vmctx *ctx, int vcpu,
struct pci_devinst *pi, int offset,
int bytes, uint32_t val);
int (*pe_cfgread)(struct vmctx *ctx, int vcpu,
struct pci_devinst *pi, int offset,
int bytes, uint32_t *retval);
/* BAR read/write callbacks */
void (*pe_barwrite)(struct vmctx *ctx, int vcpu,
struct pci_devinst *pi, int baridx,
uint64_t offset, int size, uint64_t value);
uint64_t (*pe_barread)(struct vmctx *ctx, int vcpu,
struct pci_devinst *pi, int baridx,
uint64_t offset, int size);
/* Save/restore device state */
int (*pe_snapshot)(struct vm_snapshot_meta *meta);
int (*pe_pause)(struct vmctx *ctx, struct pci_devinst *pi);
int (*pe_resume)(struct vmctx *ctx, struct pci_devinst *pi);
};
#define PCI_EMUL_SET(x) DATA_SET(pci_devemu_set, x);
enum pcibar_type {
PCIBAR_NONE,
PCIBAR_IO,
PCIBAR_MEM32,
PCIBAR_MEM64,
PCIBAR_MEMHI64
};
struct pcibar {
enum pcibar_type type; /* io or memory */
uint64_t size;
uint64_t addr;
};
#define PI_NAMESZ 40
struct msix_table_entry {
uint64_t addr;
uint32_t msg_data;
uint32_t vector_control;
} __packed;
/*
* In case the structure is modified to hold extra information, use a define
* for the size that should be emulated.
*/
#define MSIX_TABLE_ENTRY_SIZE 16
#define MAX_MSIX_TABLE_ENTRIES 2048
#define PBA_SIZE(msgnum) (roundup2((msgnum), 64) / 8)
enum lintr_stat {
IDLE,
ASSERTED,
PENDING
};
struct pci_devinst {
struct pci_devemu *pi_d;
struct vmctx *pi_vmctx;
uint8_t pi_bus, pi_slot, pi_func;
char pi_name[PI_NAMESZ];
int pi_bar_getsize;
int pi_prevcap;
int pi_capend;
struct {
int8_t pin;
enum lintr_stat state;
int pirq_pin;
int ioapic_irq;
pthread_mutex_t lock;
} pi_lintr;
struct {
int enabled;
uint64_t addr;
uint64_t msg_data;
int maxmsgnum;
} pi_msi;
struct {
int enabled;
int table_bar;
int pba_bar;
uint32_t table_offset;
int table_count;
uint32_t pba_offset;
int pba_size;
int function_mask;
struct msix_table_entry *table; /* allocated at runtime */
void *pba_page;
int pba_page_offset;
} pi_msix;
void *pi_arg; /* devemu-private data */
u_char pi_cfgdata[PCI_REGMAX + 1];
struct pcibar pi_bar[PCI_BARMAX + 1];
};
struct msicap {
uint8_t capid;
uint8_t nextptr;
uint16_t msgctrl;
uint32_t addrlo;
uint32_t addrhi;
uint16_t msgdata;
} __packed;
static_assert(sizeof(struct msicap) == 14, "compile-time assertion failed");
struct msixcap {
uint8_t capid;
uint8_t nextptr;
uint16_t msgctrl;
uint32_t table_info; /* bar index and offset within it */
uint32_t pba_info; /* bar index and offset within it */
} __packed;
static_assert(sizeof(struct msixcap) == 12, "compile-time assertion failed");
struct pciecap {
uint8_t capid;
uint8_t nextptr;
uint16_t pcie_capabilities;
uint32_t dev_capabilities; /* all devices */
uint16_t dev_control;
uint16_t dev_status;
uint32_t link_capabilities; /* devices with links */
uint16_t link_control;
uint16_t link_status;
uint32_t slot_capabilities; /* ports with slots */
uint16_t slot_control;
uint16_t slot_status;
uint16_t root_control; /* root ports */
uint16_t root_capabilities;
uint32_t root_status;
uint32_t dev_capabilities2; /* all devices */
uint16_t dev_control2;
uint16_t dev_status2;
uint32_t link_capabilities2; /* devices with links */
uint16_t link_control2;
uint16_t link_status2;
uint32_t slot_capabilities2; /* ports with slots */
uint16_t slot_control2;
uint16_t slot_status2;
} __packed;
static_assert(sizeof(struct pciecap) == 60, "compile-time assertion failed");
typedef void (*pci_lintr_cb)(int b, int s, int pin, int pirq_pin,
int ioapic_irq, void *arg);
int init_pci(struct vmctx *ctx);
void pci_callback(void);
int pci_emul_alloc_bar(struct pci_devinst *pdi, int idx,
enum pcibar_type type, uint64_t size);
int pci_emul_alloc_pbar(struct pci_devinst *pdi, int idx,
uint64_t hostbase, enum pcibar_type type, uint64_t size);
int pci_emul_add_msicap(struct pci_devinst *pi, int msgnum);
int pci_emul_add_pciecap(struct pci_devinst *pi, int pcie_device_type);
void pci_emul_capwrite(struct pci_devinst *pi, int offset, int bytes,
uint32_t val, uint8_t capoff, int capid);
void pci_emul_cmd_changed(struct pci_devinst *pi, uint16_t old);
void pci_generate_msi(struct pci_devinst *pi, int msgnum);
void pci_generate_msix(struct pci_devinst *pi, int msgnum);
void pci_lintr_assert(struct pci_devinst *pi);
void pci_lintr_deassert(struct pci_devinst *pi);
void pci_lintr_request(struct pci_devinst *pi);
int pci_msi_enabled(struct pci_devinst *pi);
int pci_msix_enabled(struct pci_devinst *pi);
int pci_msix_table_bar(struct pci_devinst *pi);
int pci_msix_pba_bar(struct pci_devinst *pi);
int pci_msi_maxmsgnum(struct pci_devinst *pi);
int pci_parse_slot(char *opt);
void pci_print_supported_devices();
void pci_populate_msicap(struct msicap *cap, int msgs, int nextptr);
int pci_emul_add_msixcap(struct pci_devinst *pi, int msgnum, int barnum);
int pci_emul_msix_twrite(struct pci_devinst *pi, uint64_t offset, int size,
uint64_t value);
uint64_t pci_emul_msix_tread(struct pci_devinst *pi, uint64_t offset, int size);
int pci_count_lintr(int bus);
void pci_walk_lintr(int bus, pci_lintr_cb cb, void *arg);
void pci_write_dsdt(void);
uint64_t pci_ecfg_base(void);
int pci_bus_configured(int bus);
#ifdef BHYVE_SNAPSHOT
int pci_snapshot(struct vm_snapshot_meta *meta);
int pci_pause(struct vmctx *ctx, const char *dev_name);
int pci_resume(struct vmctx *ctx, const char *dev_name);
#endif
static __inline void
pci_set_cfgdata8(struct pci_devinst *pi, int offset, uint8_t val)
{
assert(offset <= PCI_REGMAX);
*(uint8_t *)(pi->pi_cfgdata + offset) = val;
}
static __inline void
pci_set_cfgdata16(struct pci_devinst *pi, int offset, uint16_t val)
{
assert(offset <= (PCI_REGMAX - 1) && (offset & 1) == 0);
*(uint16_t *)(pi->pi_cfgdata + offset) = val;
}
static __inline void
pci_set_cfgdata32(struct pci_devinst *pi, int offset, uint32_t val)
{
assert(offset <= (PCI_REGMAX - 3) && (offset & 3) == 0);
*(uint32_t *)(pi->pi_cfgdata + offset) = val;
}
static __inline uint8_t
pci_get_cfgdata8(struct pci_devinst *pi, int offset)
{
assert(offset <= PCI_REGMAX);
return (*(uint8_t *)(pi->pi_cfgdata + offset));
}
static __inline uint16_t
pci_get_cfgdata16(struct pci_devinst *pi, int offset)
{
assert(offset <= (PCI_REGMAX - 1) && (offset & 1) == 0);
return (*(uint16_t *)(pi->pi_cfgdata + offset));
}
static __inline uint32_t
pci_get_cfgdata32(struct pci_devinst *pi, int offset)
{
assert(offset <= (PCI_REGMAX - 3) && (offset & 3) == 0);
return (*(uint32_t *)(pi->pi_cfgdata + offset));
}
#endif /* _PCI_EMUL_H_ */
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