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qemu/hw/usb/hcd-ehci.c
Hans de Goede e449f26bed ehci_free_packet: Discard finished packets when the queue is halted 
With pipelining it is possible to encounter a finished packet when cleaning
the queue due to a halt. This happens when a non stall error happens while
talking to a real device. In this case the queue on the usb-host side will
continue processing packets, and we can have completed packets waiting in
the queue after an error condition packet causing a halt.

There are 2 reasons to discard the completed packets at this point, rather
then trying to writing them back to the guest:

1) The guest expect to be able to cancel and/or change packets after the
packet with the error without doing an unlink, so writing them back may
confuse the guest.

2) Since the queue does not advance when halted, the writing back of these
packets will fail anyways since p->qtdaddr != q->qtdaddr, so the
ehci_verify_qtd call in ehci_writeback_async_complete_packet will fail.

Note that 2) means that then only functional change this patch introduces
is the printing of a warning when this scenario happens.

Note that discarding these packets means that the guest driver and the device
will get out of sync! This is unfortunate, but should not be a problem since
with a non stall error (iow an io-error) the 2 are out of sync already anyways.
Still this patch adds a warning to signal this happening.

Note that sofar this has only been seen with a DVB-T receiver, which gives
of a MPEG-2 stream, which allows for recovering from lost packets, see:
https://bugzilla.redhat.com/show_bug.cgi?id=890320

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2013-04-23 08:43:10 +02:00

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/*
* QEMU USB EHCI Emulation
*
* Copyright(c) 2008 Emutex Ltd. (address@hidden)
* Copyright(c) 2011-2012 Red Hat, Inc.
*
* Red Hat Authors:
* Gerd Hoffmann <kraxel@redhat.com>
* Hans de Goede <hdegoede@redhat.com>
*
* EHCI project was started by Mark Burkley, with contributions by
* Niels de Vos. David S. Ahern continued working on it. Kevin Wolf,
* Jan Kiszka and Vincent Palatin contributed bugfixes.
*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or(at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "hw/usb/hcd-ehci.h"
/* Capability Registers Base Address - section 2.2 */
#define CAPLENGTH 0x0000 /* 1-byte, 0x0001 reserved */
#define HCIVERSION 0x0002 /* 2-bytes, i/f version # */
#define HCSPARAMS 0x0004 /* 4-bytes, structural params */
#define HCCPARAMS 0x0008 /* 4-bytes, capability params */
#define EECP HCCPARAMS + 1
#define HCSPPORTROUTE1 0x000c
#define HCSPPORTROUTE2 0x0010
#define USBCMD 0x0000
#define USBCMD_RUNSTOP (1 << 0) // run / Stop
#define USBCMD_HCRESET (1 << 1) // HC Reset
#define USBCMD_FLS (3 << 2) // Frame List Size
#define USBCMD_FLS_SH 2 // Frame List Size Shift
#define USBCMD_PSE (1 << 4) // Periodic Schedule Enable
#define USBCMD_ASE (1 << 5) // Asynch Schedule Enable
#define USBCMD_IAAD (1 << 6) // Int Asynch Advance Doorbell
#define USBCMD_LHCR (1 << 7) // Light Host Controller Reset
#define USBCMD_ASPMC (3 << 8) // Async Sched Park Mode Count
#define USBCMD_ASPME (1 << 11) // Async Sched Park Mode Enable
#define USBCMD_ITC (0x7f << 16) // Int Threshold Control
#define USBCMD_ITC_SH 16 // Int Threshold Control Shift
#define USBSTS 0x0004
#define USBSTS_RO_MASK 0x0000003f
#define USBSTS_INT (1 << 0) // USB Interrupt
#define USBSTS_ERRINT (1 << 1) // Error Interrupt
#define USBSTS_PCD (1 << 2) // Port Change Detect
#define USBSTS_FLR (1 << 3) // Frame List Rollover
#define USBSTS_HSE (1 << 4) // Host System Error
#define USBSTS_IAA (1 << 5) // Interrupt on Async Advance
#define USBSTS_HALT (1 << 12) // HC Halted
#define USBSTS_REC (1 << 13) // Reclamation
#define USBSTS_PSS (1 << 14) // Periodic Schedule Status
#define USBSTS_ASS (1 << 15) // Asynchronous Schedule Status
/*
* Interrupt enable bits correspond to the interrupt active bits in USBSTS
* so no need to redefine here.
*/
#define USBINTR 0x0008
#define USBINTR_MASK 0x0000003f
#define FRINDEX 0x000c
#define CTRLDSSEGMENT 0x0010
#define PERIODICLISTBASE 0x0014
#define ASYNCLISTADDR 0x0018
#define ASYNCLISTADDR_MASK 0xffffffe0
#define CONFIGFLAG 0x0040
/*
* Bits that are reserved or are read-only are masked out of values
* written to us by software
*/
#define PORTSC_RO_MASK 0x007001c0
#define PORTSC_RWC_MASK 0x0000002a
#define PORTSC_WKOC_E (1 << 22) // Wake on Over Current Enable
#define PORTSC_WKDS_E (1 << 21) // Wake on Disconnect Enable
#define PORTSC_WKCN_E (1 << 20) // Wake on Connect Enable
#define PORTSC_PTC (15 << 16) // Port Test Control
#define PORTSC_PTC_SH 16 // Port Test Control shift
#define PORTSC_PIC (3 << 14) // Port Indicator Control
#define PORTSC_PIC_SH 14 // Port Indicator Control Shift
#define PORTSC_POWNER (1 << 13) // Port Owner
#define PORTSC_PPOWER (1 << 12) // Port Power
#define PORTSC_LINESTAT (3 << 10) // Port Line Status
#define PORTSC_LINESTAT_SH 10 // Port Line Status Shift
#define PORTSC_PRESET (1 << 8) // Port Reset
#define PORTSC_SUSPEND (1 << 7) // Port Suspend
#define PORTSC_FPRES (1 << 6) // Force Port Resume
#define PORTSC_OCC (1 << 5) // Over Current Change
#define PORTSC_OCA (1 << 4) // Over Current Active
#define PORTSC_PEDC (1 << 3) // Port Enable/Disable Change
#define PORTSC_PED (1 << 2) // Port Enable/Disable
#define PORTSC_CSC (1 << 1) // Connect Status Change
#define PORTSC_CONNECT (1 << 0) // Current Connect Status
#define FRAME_TIMER_FREQ 1000
#define FRAME_TIMER_NS (1000000000 / FRAME_TIMER_FREQ)
#define UFRAME_TIMER_NS (FRAME_TIMER_NS / 8)
#define NB_MAXINTRATE 8 // Max rate at which controller issues ints
#define BUFF_SIZE 5*4096 // Max bytes to transfer per transaction
#define MAX_QH 100 // Max allowable queue heads in a chain
#define MIN_UFR_PER_TICK 24 /* Min frames to process when catching up */
#define PERIODIC_ACTIVE 512 /* Micro-frames */
/* Internal periodic / asynchronous schedule state machine states
*/
typedef enum {
EST_INACTIVE = 1000,
EST_ACTIVE,
EST_EXECUTING,
EST_SLEEPING,
/* The following states are internal to the state machine function
*/
EST_WAITLISTHEAD,
EST_FETCHENTRY,
EST_FETCHQH,
EST_FETCHITD,
EST_FETCHSITD,
EST_ADVANCEQUEUE,
EST_FETCHQTD,
EST_EXECUTE,
EST_WRITEBACK,
EST_HORIZONTALQH
} EHCI_STATES;
/* macros for accessing fields within next link pointer entry */
#define NLPTR_GET(x) ((x) & 0xffffffe0)
#define NLPTR_TYPE_GET(x) (((x) >> 1) & 3)
#define NLPTR_TBIT(x) ((x) & 1) // 1=invalid, 0=valid
/* link pointer types */
#define NLPTR_TYPE_ITD 0 // isoc xfer descriptor
#define NLPTR_TYPE_QH 1 // queue head
#define NLPTR_TYPE_STITD 2 // split xaction, isoc xfer descriptor
#define NLPTR_TYPE_FSTN 3 // frame span traversal node
#define SET_LAST_RUN_CLOCK(s) \
(s)->last_run_ns = qemu_get_clock_ns(vm_clock);
/* nifty macros from Arnon's EHCI version */
#define get_field(data, field) \
(((data) & field##_MASK) >> field##_SH)
#define set_field(data, newval, field) do { \
uint32_t val = *data; \
val &= ~ field##_MASK; \
val |= ((newval) << field##_SH) & field##_MASK; \
*data = val; \
} while(0)
static const char *ehci_state_names[] = {
[EST_INACTIVE] = "INACTIVE",
[EST_ACTIVE] = "ACTIVE",
[EST_EXECUTING] = "EXECUTING",
[EST_SLEEPING] = "SLEEPING",
[EST_WAITLISTHEAD] = "WAITLISTHEAD",
[EST_FETCHENTRY] = "FETCH ENTRY",
[EST_FETCHQH] = "FETCH QH",
[EST_FETCHITD] = "FETCH ITD",
[EST_ADVANCEQUEUE] = "ADVANCEQUEUE",
[EST_FETCHQTD] = "FETCH QTD",
[EST_EXECUTE] = "EXECUTE",
[EST_WRITEBACK] = "WRITEBACK",
[EST_HORIZONTALQH] = "HORIZONTALQH",
};
static const char *ehci_mmio_names[] = {
[USBCMD] = "USBCMD",
[USBSTS] = "USBSTS",
[USBINTR] = "USBINTR",
[FRINDEX] = "FRINDEX",
[PERIODICLISTBASE] = "P-LIST BASE",
[ASYNCLISTADDR] = "A-LIST ADDR",
[CONFIGFLAG] = "CONFIGFLAG",
};
static int ehci_state_executing(EHCIQueue *q);
static int ehci_state_writeback(EHCIQueue *q);
static int ehci_state_advqueue(EHCIQueue *q);
static int ehci_fill_queue(EHCIPacket *p);
static void ehci_free_packet(EHCIPacket *p);
static const char *nr2str(const char **n, size_t len, uint32_t nr)
{
if (nr < len && n[nr] != NULL) {
return n[nr];
} else {
return "unknown";
}
}
static const char *state2str(uint32_t state)
{
return nr2str(ehci_state_names, ARRAY_SIZE(ehci_state_names), state);
}
static const char *addr2str(hwaddr addr)
{
return nr2str(ehci_mmio_names, ARRAY_SIZE(ehci_mmio_names), addr);
}
static void ehci_trace_usbsts(uint32_t mask, int state)
{
/* interrupts */
if (mask & USBSTS_INT) {
trace_usb_ehci_usbsts("INT", state);
}
if (mask & USBSTS_ERRINT) {
trace_usb_ehci_usbsts("ERRINT", state);
}
if (mask & USBSTS_PCD) {
trace_usb_ehci_usbsts("PCD", state);
}
if (mask & USBSTS_FLR) {
trace_usb_ehci_usbsts("FLR", state);
}
if (mask & USBSTS_HSE) {
trace_usb_ehci_usbsts("HSE", state);
}
if (mask & USBSTS_IAA) {
trace_usb_ehci_usbsts("IAA", state);
}
/* status */
if (mask & USBSTS_HALT) {
trace_usb_ehci_usbsts("HALT", state);
}
if (mask & USBSTS_REC) {
trace_usb_ehci_usbsts("REC", state);
}
if (mask & USBSTS_PSS) {
trace_usb_ehci_usbsts("PSS", state);
}
if (mask & USBSTS_ASS) {
trace_usb_ehci_usbsts("ASS", state);
}
}
static inline void ehci_set_usbsts(EHCIState *s, int mask)
{
if ((s->usbsts & mask) == mask) {
return;
}
ehci_trace_usbsts(mask, 1);
s->usbsts |= mask;
}
static inline void ehci_clear_usbsts(EHCIState *s, int mask)
{
if ((s->usbsts & mask) == 0) {
return;
}
ehci_trace_usbsts(mask, 0);
s->usbsts &= ~mask;
}
/* update irq line */
static inline void ehci_update_irq(EHCIState *s)
{
int level = 0;
if ((s->usbsts & USBINTR_MASK) & s->usbintr) {
level = 1;
}
trace_usb_ehci_irq(level, s->frindex, s->usbsts, s->usbintr);
qemu_set_irq(s->irq, level);
}
/* flag interrupt condition */
static inline void ehci_raise_irq(EHCIState *s, int intr)
{
if (intr & (USBSTS_PCD | USBSTS_FLR | USBSTS_HSE)) {
s->usbsts |= intr;
ehci_update_irq(s);
} else {
s->usbsts_pending |= intr;
}
}
/*
* Commit pending interrupts (added via ehci_raise_irq),
* at the rate allowed by "Interrupt Threshold Control".
*/
static inline void ehci_commit_irq(EHCIState *s)
{
uint32_t itc;
if (!s->usbsts_pending) {
return;
}
if (s->usbsts_frindex > s->frindex) {
return;
}
itc = (s->usbcmd >> 16) & 0xff;
s->usbsts |= s->usbsts_pending;
s->usbsts_pending = 0;
s->usbsts_frindex = s->frindex + itc;
ehci_update_irq(s);
}
static void ehci_update_halt(EHCIState *s)
{
if (s->usbcmd & USBCMD_RUNSTOP) {
ehci_clear_usbsts(s, USBSTS_HALT);
} else {
if (s->astate == EST_INACTIVE && s->pstate == EST_INACTIVE) {
ehci_set_usbsts(s, USBSTS_HALT);
}
}
}
static void ehci_set_state(EHCIState *s, int async, int state)
{
if (async) {
trace_usb_ehci_state("async", state2str(state));
s->astate = state;
if (s->astate == EST_INACTIVE) {
ehci_clear_usbsts(s, USBSTS_ASS);
ehci_update_halt(s);
} else {
ehci_set_usbsts(s, USBSTS_ASS);
}
} else {
trace_usb_ehci_state("periodic", state2str(state));
s->pstate = state;
if (s->pstate == EST_INACTIVE) {
ehci_clear_usbsts(s, USBSTS_PSS);
ehci_update_halt(s);
} else {
ehci_set_usbsts(s, USBSTS_PSS);
}
}
}
static int ehci_get_state(EHCIState *s, int async)
{
return async ? s->astate : s->pstate;
}
static void ehci_set_fetch_addr(EHCIState *s, int async, uint32_t addr)
{
if (async) {
s->a_fetch_addr = addr;
} else {
s->p_fetch_addr = addr;
}
}
static int ehci_get_fetch_addr(EHCIState *s, int async)
{
return async ? s->a_fetch_addr : s->p_fetch_addr;
}
static void ehci_trace_qh(EHCIQueue *q, hwaddr addr, EHCIqh *qh)
{
/* need three here due to argument count limits */
trace_usb_ehci_qh_ptrs(q, addr, qh->next,
qh->current_qtd, qh->next_qtd, qh->altnext_qtd);
trace_usb_ehci_qh_fields(addr,
get_field(qh->epchar, QH_EPCHAR_RL),
get_field(qh->epchar, QH_EPCHAR_MPLEN),
get_field(qh->epchar, QH_EPCHAR_EPS),
get_field(qh->epchar, QH_EPCHAR_EP),
get_field(qh->epchar, QH_EPCHAR_DEVADDR));
trace_usb_ehci_qh_bits(addr,
(bool)(qh->epchar & QH_EPCHAR_C),
(bool)(qh->epchar & QH_EPCHAR_H),
(bool)(qh->epchar & QH_EPCHAR_DTC),
(bool)(qh->epchar & QH_EPCHAR_I));
}
static void ehci_trace_qtd(EHCIQueue *q, hwaddr addr, EHCIqtd *qtd)
{
/* need three here due to argument count limits */
trace_usb_ehci_qtd_ptrs(q, addr, qtd->next, qtd->altnext);
trace_usb_ehci_qtd_fields(addr,
get_field(qtd->token, QTD_TOKEN_TBYTES),
get_field(qtd->token, QTD_TOKEN_CPAGE),
get_field(qtd->token, QTD_TOKEN_CERR),
get_field(qtd->token, QTD_TOKEN_PID));
trace_usb_ehci_qtd_bits(addr,
(bool)(qtd->token & QTD_TOKEN_IOC),
(bool)(qtd->token & QTD_TOKEN_ACTIVE),
(bool)(qtd->token & QTD_TOKEN_HALT),
(bool)(qtd->token & QTD_TOKEN_BABBLE),
(bool)(qtd->token & QTD_TOKEN_XACTERR));
}
static void ehci_trace_itd(EHCIState *s, hwaddr addr, EHCIitd *itd)
{
trace_usb_ehci_itd(addr, itd->next,
get_field(itd->bufptr[1], ITD_BUFPTR_MAXPKT),
get_field(itd->bufptr[2], ITD_BUFPTR_MULT),
get_field(itd->bufptr[0], ITD_BUFPTR_EP),
get_field(itd->bufptr[0], ITD_BUFPTR_DEVADDR));
}
static void ehci_trace_sitd(EHCIState *s, hwaddr addr,
EHCIsitd *sitd)
{
trace_usb_ehci_sitd(addr, sitd->next,
(bool)(sitd->results & SITD_RESULTS_ACTIVE));
}
static void ehci_trace_guest_bug(EHCIState *s, const char *message)
{
trace_usb_ehci_guest_bug(message);
fprintf(stderr, "ehci warning: %s\n", message);
}
static inline bool ehci_enabled(EHCIState *s)
{
return s->usbcmd & USBCMD_RUNSTOP;
}
static inline bool ehci_async_enabled(EHCIState *s)
{
return ehci_enabled(s) && (s->usbcmd & USBCMD_ASE);
}
static inline bool ehci_periodic_enabled(EHCIState *s)
{
return ehci_enabled(s) && (s->usbcmd & USBCMD_PSE);
}
/* Get an array of dwords from main memory */
static inline int get_dwords(EHCIState *ehci, uint32_t addr,
uint32_t *buf, int num)
{
int i;
if (!ehci->dma) {
ehci_raise_irq(ehci, USBSTS_HSE);
ehci->usbcmd &= ~USBCMD_RUNSTOP;
trace_usb_ehci_dma_error();
return -1;
}
for (i = 0; i < num; i++, buf++, addr += sizeof(*buf)) {
dma_memory_read(ehci->dma, addr, buf, sizeof(*buf));
*buf = le32_to_cpu(*buf);
}
return num;
}
/* Put an array of dwords in to main memory */
static inline int put_dwords(EHCIState *ehci, uint32_t addr,
uint32_t *buf, int num)
{
int i;
if (!ehci->dma) {
ehci_raise_irq(ehci, USBSTS_HSE);
ehci->usbcmd &= ~USBCMD_RUNSTOP;
trace_usb_ehci_dma_error();
return -1;
}
for (i = 0; i < num; i++, buf++, addr += sizeof(*buf)) {
uint32_t tmp = cpu_to_le32(*buf);
dma_memory_write(ehci->dma, addr, &tmp, sizeof(tmp));
}
return num;
}
static int ehci_get_pid(EHCIqtd *qtd)
{
switch (get_field(qtd->token, QTD_TOKEN_PID)) {
case 0:
return USB_TOKEN_OUT;
case 1:
return USB_TOKEN_IN;
case 2:
return USB_TOKEN_SETUP;
default:
fprintf(stderr, "bad token\n");
return 0;
}
}
static bool ehci_verify_qh(EHCIQueue *q, EHCIqh *qh)
{
uint32_t devaddr = get_field(qh->epchar, QH_EPCHAR_DEVADDR);
uint32_t endp = get_field(qh->epchar, QH_EPCHAR_EP);
if ((devaddr != get_field(q->qh.epchar, QH_EPCHAR_DEVADDR)) ||
(endp != get_field(q->qh.epchar, QH_EPCHAR_EP)) ||
(qh->current_qtd != q->qh.current_qtd) ||
(q->async && qh->next_qtd != q->qh.next_qtd) ||
(memcmp(&qh->altnext_qtd, &q->qh.altnext_qtd,
7 * sizeof(uint32_t)) != 0) ||
(q->dev != NULL && q->dev->addr != devaddr)) {
return false;
} else {
return true;
}
}
static bool ehci_verify_qtd(EHCIPacket *p, EHCIqtd *qtd)
{
if (p->qtdaddr != p->queue->qtdaddr ||
(p->queue->async && !NLPTR_TBIT(p->qtd.next) &&
(p->qtd.next != qtd->next)) ||
(!NLPTR_TBIT(p->qtd.altnext) && (p->qtd.altnext != qtd->altnext)) ||
p->qtd.token != qtd->token ||
p->qtd.bufptr[0] != qtd->bufptr[0]) {
return false;
} else {
return true;
}
}
static bool ehci_verify_pid(EHCIQueue *q, EHCIqtd *qtd)
{
int ep = get_field(q->qh.epchar, QH_EPCHAR_EP);
int pid = ehci_get_pid(qtd);
/* Note the pid changing is normal for ep 0 (the control ep) */
if (q->last_pid && ep != 0 && pid != q->last_pid) {
return false;
} else {
return true;
}
}
/* Finish executing and writeback a packet outside of the regular
fetchqh -> fetchqtd -> execute -> writeback cycle */
static void ehci_writeback_async_complete_packet(EHCIPacket *p)
{
EHCIQueue *q = p->queue;
EHCIqtd qtd;
EHCIqh qh;
int state;
/* Verify the qh + qtd, like we do when going through fetchqh & fetchqtd */
get_dwords(q->ehci, NLPTR_GET(q->qhaddr),
(uint32_t *) &qh, sizeof(EHCIqh) >> 2);
get_dwords(q->ehci, NLPTR_GET(q->qtdaddr),
(uint32_t *) &qtd, sizeof(EHCIqtd) >> 2);
if (!ehci_verify_qh(q, &qh) || !ehci_verify_qtd(p, &qtd)) {
p->async = EHCI_ASYNC_INITIALIZED;
ehci_free_packet(p);
return;
}
state = ehci_get_state(q->ehci, q->async);
ehci_state_executing(q);
ehci_state_writeback(q); /* Frees the packet! */
if (!(q->qh.token & QTD_TOKEN_HALT)) {
ehci_state_advqueue(q);
}
ehci_set_state(q->ehci, q->async, state);
}
/* packet management */
static EHCIPacket *ehci_alloc_packet(EHCIQueue *q)
{
EHCIPacket *p;
p = g_new0(EHCIPacket, 1);
p->queue = q;
usb_packet_init(&p->packet);
QTAILQ_INSERT_TAIL(&q->packets, p, next);
trace_usb_ehci_packet_action(p->queue, p, "alloc");
return p;
}
static void ehci_free_packet(EHCIPacket *p)
{
if (p->async == EHCI_ASYNC_FINISHED &&
!(p->queue->qh.token & QTD_TOKEN_HALT)) {
ehci_writeback_async_complete_packet(p);
return;
}
trace_usb_ehci_packet_action(p->queue, p, "free");
if (p->async == EHCI_ASYNC_INFLIGHT) {
usb_cancel_packet(&p->packet);
}
if (p->async == EHCI_ASYNC_FINISHED &&
p->packet.status == USB_RET_SUCCESS) {
fprintf(stderr,
"EHCI: Dropping completed packet from halted %s ep %02X\n",
(p->pid == USB_TOKEN_IN) ? "in" : "out",
get_field(p->queue->qh.epchar, QH_EPCHAR_EP));
}
if (p->async != EHCI_ASYNC_NONE) {
usb_packet_unmap(&p->packet, &p->sgl);
qemu_sglist_destroy(&p->sgl);
}
QTAILQ_REMOVE(&p->queue->packets, p, next);
usb_packet_cleanup(&p->packet);
g_free(p);
}
/* queue management */
static EHCIQueue *ehci_alloc_queue(EHCIState *ehci, uint32_t addr, int async)
{
EHCIQueueHead *head = async ? &ehci->aqueues : &ehci->pqueues;
EHCIQueue *q;
q = g_malloc0(sizeof(*q));
q->ehci = ehci;
q->qhaddr = addr;
q->async = async;
QTAILQ_INIT(&q->packets);
QTAILQ_INSERT_HEAD(head, q, next);
trace_usb_ehci_queue_action(q, "alloc");
return q;
}
static void ehci_queue_stopped(EHCIQueue *q)
{
int endp = get_field(q->qh.epchar, QH_EPCHAR_EP);
if (!q->last_pid || !q->dev) {
return;
}
usb_device_ep_stopped(q->dev, usb_ep_get(q->dev, q->last_pid, endp));
}
static int ehci_cancel_queue(EHCIQueue *q)
{
EHCIPacket *p;
int packets = 0;
p = QTAILQ_FIRST(&q->packets);
if (p == NULL) {
goto leave;
}
trace_usb_ehci_queue_action(q, "cancel");
do {
ehci_free_packet(p);
packets++;
} while ((p = QTAILQ_FIRST(&q->packets)) != NULL);
leave:
ehci_queue_stopped(q);
return packets;
}
static int ehci_reset_queue(EHCIQueue *q)
{
int packets;
trace_usb_ehci_queue_action(q, "reset");
packets = ehci_cancel_queue(q);
q->dev = NULL;
q->qtdaddr = 0;
q->last_pid = 0;
return packets;
}
static void ehci_free_queue(EHCIQueue *q, const char *warn)
{
EHCIQueueHead *head = q->async ? &q->ehci->aqueues : &q->ehci->pqueues;
int cancelled;
trace_usb_ehci_queue_action(q, "free");
cancelled = ehci_cancel_queue(q);
if (warn && cancelled > 0) {
ehci_trace_guest_bug(q->ehci, warn);
}
QTAILQ_REMOVE(head, q, next);
g_free(q);
}
static EHCIQueue *ehci_find_queue_by_qh(EHCIState *ehci, uint32_t addr,
int async)
{
EHCIQueueHead *head = async ? &ehci->aqueues : &ehci->pqueues;
EHCIQueue *q;
QTAILQ_FOREACH(q, head, next) {
if (addr == q->qhaddr) {
return q;
}
}
return NULL;
}
static void ehci_queues_rip_unused(EHCIState *ehci, int async)
{
EHCIQueueHead *head = async ? &ehci->aqueues : &ehci->pqueues;
const char *warn = async ? "guest unlinked busy QH" : NULL;
uint64_t maxage = FRAME_TIMER_NS * ehci->maxframes * 4;
EHCIQueue *q, *tmp;
QTAILQ_FOREACH_SAFE(q, head, next, tmp) {
if (q->seen) {
q->seen = 0;
q->ts = ehci->last_run_ns;
continue;
}
if (ehci->last_run_ns < q->ts + maxage) {
continue;
}
ehci_free_queue(q, warn);
}
}
static void ehci_queues_rip_unseen(EHCIState *ehci, int async)
{
EHCIQueueHead *head = async ? &ehci->aqueues : &ehci->pqueues;
EHCIQueue *q, *tmp;
QTAILQ_FOREACH_SAFE(q, head, next, tmp) {
if (!q->seen) {
ehci_free_queue(q, NULL);
}
}
}
static void ehci_queues_rip_device(EHCIState *ehci, USBDevice *dev, int async)
{
EHCIQueueHead *head = async ? &ehci->aqueues : &ehci->pqueues;
EHCIQueue *q, *tmp;
QTAILQ_FOREACH_SAFE(q, head, next, tmp) {
if (q->dev != dev) {
continue;
}
ehci_free_queue(q, NULL);
}
}
static void ehci_queues_rip_all(EHCIState *ehci, int async)
{
EHCIQueueHead *head = async ? &ehci->aqueues : &ehci->pqueues;
const char *warn = async ? "guest stopped busy async schedule" : NULL;
EHCIQueue *q, *tmp;
QTAILQ_FOREACH_SAFE(q, head, next, tmp) {
ehci_free_queue(q, warn);
}
}
/* Attach or detach a device on root hub */
static void ehci_attach(USBPort *port)
{
EHCIState *s = port->opaque;
uint32_t *portsc = &s->portsc[port->index];
const char *owner = (*portsc & PORTSC_POWNER) ? "comp" : "ehci";
trace_usb_ehci_port_attach(port->index, owner, port->dev->product_desc);
if (*portsc & PORTSC_POWNER) {
USBPort *companion = s->companion_ports[port->index];
companion->dev = port->dev;
companion->ops->attach(companion);
return;
}
*portsc |= PORTSC_CONNECT;
*portsc |= PORTSC_CSC;
ehci_raise_irq(s, USBSTS_PCD);
}
static void ehci_detach(USBPort *port)
{
EHCIState *s = port->opaque;
uint32_t *portsc = &s->portsc[port->index];
const char *owner = (*portsc & PORTSC_POWNER) ? "comp" : "ehci";
trace_usb_ehci_port_detach(port->index, owner);
if (*portsc & PORTSC_POWNER) {
USBPort *companion = s->companion_ports[port->index];
companion->ops->detach(companion);
companion->dev = NULL;
/*
* EHCI spec 4.2.2: "When a disconnect occurs... On the event,
* the port ownership is returned immediately to the EHCI controller."
*/
*portsc &= ~PORTSC_POWNER;
return;
}
ehci_queues_rip_device(s, port->dev, 0);
ehci_queues_rip_device(s, port->dev, 1);
*portsc &= ~(PORTSC_CONNECT|PORTSC_PED);
*portsc |= PORTSC_CSC;
ehci_raise_irq(s, USBSTS_PCD);
}
static void ehci_child_detach(USBPort *port, USBDevice *child)
{
EHCIState *s = port->opaque;
uint32_t portsc = s->portsc[port->index];
if (portsc & PORTSC_POWNER) {
USBPort *companion = s->companion_ports[port->index];
companion->ops->child_detach(companion, child);
return;
}
ehci_queues_rip_device(s, child, 0);
ehci_queues_rip_device(s, child, 1);
}
static void ehci_wakeup(USBPort *port)
{
EHCIState *s = port->opaque;
uint32_t portsc = s->portsc[port->index];
if (portsc & PORTSC_POWNER) {
USBPort *companion = s->companion_ports[port->index];
if (companion->ops->wakeup) {
companion->ops->wakeup(companion);
}
return;
}
qemu_bh_schedule(s->async_bh);
}
static int ehci_register_companion(USBBus *bus, USBPort *ports[],
uint32_t portcount, uint32_t firstport)
{
EHCIState *s = container_of(bus, EHCIState, bus);
uint32_t i;
if (firstport + portcount > NB_PORTS) {
qerror_report(QERR_INVALID_PARAMETER_VALUE, "firstport",
"firstport on masterbus");
error_printf_unless_qmp(
"firstport value of %u makes companion take ports %u - %u, which "
"is outside of the valid range of 0 - %u\n", firstport, firstport,
firstport + portcount - 1, NB_PORTS - 1);
return -1;
}
for (i = 0; i < portcount; i++) {
if (s->companion_ports[firstport + i]) {
qerror_report(QERR_INVALID_PARAMETER_VALUE, "masterbus",
"an USB masterbus");
error_printf_unless_qmp(
"port %u on masterbus %s already has a companion assigned\n",
firstport + i, bus->qbus.name);
return -1;
}
}
for (i = 0; i < portcount; i++) {
s->companion_ports[firstport + i] = ports[i];
s->ports[firstport + i].speedmask |=
USB_SPEED_MASK_LOW | USB_SPEED_MASK_FULL;
/* Ensure devs attached before the initial reset go to the companion */
s->portsc[firstport + i] = PORTSC_POWNER;
}
s->companion_count++;
s->caps[0x05] = (s->companion_count << 4) | portcount;
return 0;
}
static void ehci_wakeup_endpoint(USBBus *bus, USBEndpoint *ep,
unsigned int stream)
{
EHCIState *s = container_of(bus, EHCIState, bus);
uint32_t portsc = s->portsc[ep->dev->port->index];
if (portsc & PORTSC_POWNER) {
return;
}
s->periodic_sched_active = PERIODIC_ACTIVE;
qemu_bh_schedule(s->async_bh);
}
static USBDevice *ehci_find_device(EHCIState *ehci, uint8_t addr)
{
USBDevice *dev;
USBPort *port;
int i;
for (i = 0; i < NB_PORTS; i++) {
port = &ehci->ports[i];
if (!(ehci->portsc[i] & PORTSC_PED)) {
DPRINTF("Port %d not enabled\n", i);
continue;
}
dev = usb_find_device(port, addr);
if (dev != NULL) {
return dev;
}
}
return NULL;
}
/* 4.1 host controller initialization */
static void ehci_reset(void *opaque)
{
EHCIState *s = opaque;
int i;
USBDevice *devs[NB_PORTS];
trace_usb_ehci_reset();
/*
* Do the detach before touching portsc, so that it correctly gets send to
* us or to our companion based on PORTSC_POWNER before the reset.
*/
for(i = 0; i < NB_PORTS; i++) {
devs[i] = s->ports[i].dev;
if (devs[i] && devs[i]->attached) {
usb_detach(&s->ports[i]);
}
}
memset(&s->opreg, 0x00, sizeof(s->opreg));
memset(&s->portsc, 0x00, sizeof(s->portsc));
s->usbcmd = NB_MAXINTRATE << USBCMD_ITC_SH;
s->usbsts = USBSTS_HALT;
s->usbsts_pending = 0;
s->usbsts_frindex = 0;
s->astate = EST_INACTIVE;
s->pstate = EST_INACTIVE;
for(i = 0; i < NB_PORTS; i++) {
if (s->companion_ports[i]) {
s->portsc[i] = PORTSC_POWNER | PORTSC_PPOWER;
} else {
s->portsc[i] = PORTSC_PPOWER;
}
if (devs[i] && devs[i]->attached) {
usb_attach(&s->ports[i]);
usb_device_reset(devs[i]);
}
}
ehci_queues_rip_all(s, 0);
ehci_queues_rip_all(s, 1);
qemu_del_timer(s->frame_timer);
qemu_bh_cancel(s->async_bh);
}
static uint64_t ehci_caps_read(void *ptr, hwaddr addr,
unsigned size)
{
EHCIState *s = ptr;
return s->caps[addr];
}
static uint64_t ehci_opreg_read(void *ptr, hwaddr addr,
unsigned size)
{
EHCIState *s = ptr;
uint32_t val;
switch (addr) {
case FRINDEX:
/* Round down to mult of 8, else it can go backwards on migration */
val = s->frindex & ~7;
break;
default:
val = s->opreg[addr >> 2];
}
trace_usb_ehci_opreg_read(addr + s->opregbase, addr2str(addr), val);
return val;
}
static uint64_t ehci_port_read(void *ptr, hwaddr addr,
unsigned size)
{
EHCIState *s = ptr;
uint32_t val;
val = s->portsc[addr >> 2];
trace_usb_ehci_portsc_read(addr + PORTSC_BEGIN, addr >> 2, val);
return val;
}
static void handle_port_owner_write(EHCIState *s, int port, uint32_t owner)
{
USBDevice *dev = s->ports[port].dev;
uint32_t *portsc = &s->portsc[port];
uint32_t orig;
if (s->companion_ports[port] == NULL)
return;
owner = owner & PORTSC_POWNER;
orig = *portsc & PORTSC_POWNER;
if (!(owner ^ orig)) {
return;
}
if (dev && dev->attached) {
usb_detach(&s->ports[port]);
}
*portsc &= ~PORTSC_POWNER;
*portsc |= owner;
if (dev && dev->attached) {
usb_attach(&s->ports[port]);
}
}
static void ehci_port_write(void *ptr, hwaddr addr,
uint64_t val, unsigned size)
{
EHCIState *s = ptr;
int port = addr >> 2;
uint32_t *portsc = &s->portsc[port];
uint32_t old = *portsc;
USBDevice *dev = s->ports[port].dev;
trace_usb_ehci_portsc_write(addr + PORTSC_BEGIN, addr >> 2, val);
/* Clear rwc bits */
*portsc &= ~(val & PORTSC_RWC_MASK);
/* The guest may clear, but not set the PED bit */
*portsc &= val | ~PORTSC_PED;
/* POWNER is masked out by RO_MASK as it is RO when we've no companion */
handle_port_owner_write(s, port, val);
/* And finally apply RO_MASK */
val &= PORTSC_RO_MASK;
if ((val & PORTSC_PRESET) && !(*portsc & PORTSC_PRESET)) {
trace_usb_ehci_port_reset(port, 1);
}
if (!(val & PORTSC_PRESET) &&(*portsc & PORTSC_PRESET)) {
trace_usb_ehci_port_reset(port, 0);
if (dev && dev->attached) {
usb_port_reset(&s->ports[port]);
*portsc &= ~PORTSC_CSC;
}
/*
* Table 2.16 Set the enable bit(and enable bit change) to indicate
* to SW that this port has a high speed device attached
*/
if (dev && dev->attached && (dev->speedmask & USB_SPEED_MASK_HIGH)) {
val |= PORTSC_PED;
}
}
*portsc &= ~PORTSC_RO_MASK;
*portsc |= val;
trace_usb_ehci_portsc_change(addr + PORTSC_BEGIN, addr >> 2, *portsc, old);
}
static void ehci_opreg_write(void *ptr, hwaddr addr,
uint64_t val, unsigned size)
{
EHCIState *s = ptr;
uint32_t *mmio = s->opreg + (addr >> 2);
uint32_t old = *mmio;
int i;
trace_usb_ehci_opreg_write(addr + s->opregbase, addr2str(addr), val);
switch (addr) {
case USBCMD:
if (val & USBCMD_HCRESET) {
ehci_reset(s);
val = s->usbcmd;
break;
}
/* not supporting dynamic frame list size at the moment */
if ((val & USBCMD_FLS) && !(s->usbcmd & USBCMD_FLS)) {
fprintf(stderr, "attempt to set frame list size -- value %d\n",
(int)val & USBCMD_FLS);
val &= ~USBCMD_FLS;
}
if (val & USBCMD_IAAD) {
/*
* Process IAAD immediately, otherwise the Linux IAAD watchdog may
* trigger and re-use a qh without us seeing the unlink.
*/
s->async_stepdown = 0;
qemu_bh_schedule(s->async_bh);
trace_usb_ehci_doorbell_ring();
}
if (((USBCMD_RUNSTOP | USBCMD_PSE | USBCMD_ASE) & val) !=
((USBCMD_RUNSTOP | USBCMD_PSE | USBCMD_ASE) & s->usbcmd)) {
if (s->pstate == EST_INACTIVE) {
SET_LAST_RUN_CLOCK(s);
}
s->usbcmd = val; /* Set usbcmd for ehci_update_halt() */
ehci_update_halt(s);
s->async_stepdown = 0;
qemu_bh_schedule(s->async_bh);
}
break;
case USBSTS:
val &= USBSTS_RO_MASK; // bits 6 through 31 are RO
ehci_clear_usbsts(s, val); // bits 0 through 5 are R/WC
val = s->usbsts;
ehci_update_irq(s);
break;
case USBINTR:
val &= USBINTR_MASK;
if (ehci_enabled(s) && (USBSTS_FLR & val)) {
qemu_bh_schedule(s->async_bh);
}
break;
case FRINDEX:
val &= 0x00003fff; /* frindex is 14bits */
s->usbsts_frindex = val;
break;
case CONFIGFLAG:
val &= 0x1;
if (val) {
for(i = 0; i < NB_PORTS; i++)
handle_port_owner_write(s, i, 0);
}
break;
case PERIODICLISTBASE:
if (ehci_periodic_enabled(s)) {
fprintf(stderr,
"ehci: PERIODIC list base register set while periodic schedule\n"
" is enabled and HC is enabled\n");
}
break;
case ASYNCLISTADDR:
if (ehci_async_enabled(s)) {
fprintf(stderr,
"ehci: ASYNC list address register set while async schedule\n"
" is enabled and HC is enabled\n");
}
break;
}
*mmio = val;
trace_usb_ehci_opreg_change(addr + s->opregbase, addr2str(addr),
*mmio, old);
}
/*
* Write the qh back to guest physical memory. This step isn't
* in the EHCI spec but we need to do it since we don't share
* physical memory with our guest VM.
*
* The first three dwords are read-only for the EHCI, so skip them
* when writing back the qh.
*/
static void ehci_flush_qh(EHCIQueue *q)
{
uint32_t *qh = (uint32_t *) &q->qh;
uint32_t dwords = sizeof(EHCIqh) >> 2;
uint32_t addr = NLPTR_GET(q->qhaddr);
put_dwords(q->ehci, addr + 3 * sizeof(uint32_t), qh + 3, dwords - 3);
}
// 4.10.2
static int ehci_qh_do_overlay(EHCIQueue *q)
{
EHCIPacket *p = QTAILQ_FIRST(&q->packets);
int i;
int dtoggle;
int ping;
int eps;
int reload;
assert(p != NULL);
assert(p->qtdaddr == q->qtdaddr);
// remember values in fields to preserve in qh after overlay
dtoggle = q->qh.token & QTD_TOKEN_DTOGGLE;
ping = q->qh.token & QTD_TOKEN_PING;
q->qh.current_qtd = p->qtdaddr;
q->qh.next_qtd = p->qtd.next;
q->qh.altnext_qtd = p->qtd.altnext;
q->qh.token = p->qtd.token;
eps = get_field(q->qh.epchar, QH_EPCHAR_EPS);
if (eps == EHCI_QH_EPS_HIGH) {
q->qh.token &= ~QTD_TOKEN_PING;
q->qh.token |= ping;
}
reload = get_field(q->qh.epchar, QH_EPCHAR_RL);
set_field(&q->qh.altnext_qtd, reload, QH_ALTNEXT_NAKCNT);
for (i = 0; i < 5; i++) {
q->qh.bufptr[i] = p->qtd.bufptr[i];
}
if (!(q->qh.epchar & QH_EPCHAR_DTC)) {
// preserve QH DT bit
q->qh.token &= ~QTD_TOKEN_DTOGGLE;
q->qh.token |= dtoggle;
}
q->qh.bufptr[1] &= ~BUFPTR_CPROGMASK_MASK;
q->qh.bufptr[2] &= ~BUFPTR_FRAMETAG_MASK;
ehci_flush_qh(q);
return 0;
}
static int ehci_init_transfer(EHCIPacket *p)
{
uint32_t cpage, offset, bytes, plen;
dma_addr_t page;
cpage = get_field(p->qtd.token, QTD_TOKEN_CPAGE);
bytes = get_field(p->qtd.token, QTD_TOKEN_TBYTES);
offset = p->qtd.bufptr[0] & ~QTD_BUFPTR_MASK;
qemu_sglist_init(&p->sgl, 5, p->queue->ehci->dma);
while (bytes > 0) {
if (cpage > 4) {
fprintf(stderr, "cpage out of range (%d)\n", cpage);
return -1;
}
page = p->qtd.bufptr[cpage] & QTD_BUFPTR_MASK;
page += offset;
plen = bytes;
if (plen > 4096 - offset) {
plen = 4096 - offset;
offset = 0;
cpage++;
}
qemu_sglist_add(&p->sgl, page, plen);
bytes -= plen;
}
return 0;
}
static void ehci_finish_transfer(EHCIQueue *q, int len)
{
uint32_t cpage, offset;
if (len > 0) {
/* update cpage & offset */
cpage = get_field(q->qh.token, QTD_TOKEN_CPAGE);
offset = q->qh.bufptr[0] & ~QTD_BUFPTR_MASK;
offset += len;
cpage += offset >> QTD_BUFPTR_SH;
offset &= ~QTD_BUFPTR_MASK;
set_field(&q->qh.token, cpage, QTD_TOKEN_CPAGE);
q->qh.bufptr[0] &= QTD_BUFPTR_MASK;
q->qh.bufptr[0] |= offset;
}
}
static void ehci_async_complete_packet(USBPort *port, USBPacket *packet)
{
EHCIPacket *p;
EHCIState *s = port->opaque;
uint32_t portsc = s->portsc[port->index];
if (portsc & PORTSC_POWNER) {
USBPort *companion = s->companion_ports[port->index];
companion->ops->complete(companion, packet);
return;
}
p = container_of(packet, EHCIPacket, packet);
assert(p->async == EHCI_ASYNC_INFLIGHT);
if (packet->status == USB_RET_REMOVE_FROM_QUEUE) {
trace_usb_ehci_packet_action(p->queue, p, "remove");
ehci_free_packet(p);
return;
}
trace_usb_ehci_packet_action(p->queue, p, "wakeup");
p->async = EHCI_ASYNC_FINISHED;
if (!p->queue->async) {
s->periodic_sched_active = PERIODIC_ACTIVE;
}
qemu_bh_schedule(s->async_bh);
}
static void ehci_execute_complete(EHCIQueue *q)
{
EHCIPacket *p = QTAILQ_FIRST(&q->packets);
uint32_t tbytes;
assert(p != NULL);
assert(p->qtdaddr == q->qtdaddr);
assert(p->async == EHCI_ASYNC_INITIALIZED ||
p->async == EHCI_ASYNC_FINISHED);
DPRINTF("execute_complete: qhaddr 0x%x, next 0x%x, qtdaddr 0x%x, "
"status %d, actual_length %d\n",
q->qhaddr, q->qh.next, q->qtdaddr,
p->packet.status, p->packet.actual_length);
switch (p->packet.status) {
case USB_RET_SUCCESS:
break;
case USB_RET_IOERROR:
case USB_RET_NODEV:
q->qh.token |= (QTD_TOKEN_HALT | QTD_TOKEN_XACTERR);
set_field(&q->qh.token, 0, QTD_TOKEN_CERR);
ehci_raise_irq(q->ehci, USBSTS_ERRINT);
break;
case USB_RET_STALL:
q->qh.token |= QTD_TOKEN_HALT;
ehci_raise_irq(q->ehci, USBSTS_ERRINT);
break;
case USB_RET_NAK:
set_field(&q->qh.altnext_qtd, 0, QH_ALTNEXT_NAKCNT);
return; /* We're not done yet with this transaction */
case USB_RET_BABBLE:
q->qh.token |= (QTD_TOKEN_HALT | QTD_TOKEN_BABBLE);
ehci_raise_irq(q->ehci, USBSTS_ERRINT);
break;
default:
/* should not be triggerable */
fprintf(stderr, "USB invalid response %d\n", p->packet.status);
assert(0);
break;
}
/* TODO check 4.12 for splits */
tbytes = get_field(q->qh.token, QTD_TOKEN_TBYTES);
if (tbytes && p->pid == USB_TOKEN_IN) {
tbytes -= p->packet.actual_length;
if (tbytes) {
/* 4.15.1.2 must raise int on a short input packet */
ehci_raise_irq(q->ehci, USBSTS_INT);
if (q->async) {
q->ehci->int_req_by_async = true;
}
}
} else {
tbytes = 0;
}
DPRINTF("updating tbytes to %d\n", tbytes);
set_field(&q->qh.token, tbytes, QTD_TOKEN_TBYTES);
ehci_finish_transfer(q, p->packet.actual_length);
usb_packet_unmap(&p->packet, &p->sgl);
qemu_sglist_destroy(&p->sgl);
p->async = EHCI_ASYNC_NONE;
q->qh.token ^= QTD_TOKEN_DTOGGLE;
q->qh.token &= ~QTD_TOKEN_ACTIVE;
if (q->qh.token & QTD_TOKEN_IOC) {
ehci_raise_irq(q->ehci, USBSTS_INT);
if (q->async) {
q->ehci->int_req_by_async = true;
}
}
}
/* 4.10.3 returns "again" */
static int ehci_execute(EHCIPacket *p, const char *action)
{
USBEndpoint *ep;
int endp;
bool spd;
assert(p->async == EHCI_ASYNC_NONE ||
p->async == EHCI_ASYNC_INITIALIZED);
if (!(p->qtd.token & QTD_TOKEN_ACTIVE)) {
fprintf(stderr, "Attempting to execute inactive qtd\n");
return -1;
}
if (get_field(p->qtd.token, QTD_TOKEN_TBYTES) > BUFF_SIZE) {
ehci_trace_guest_bug(p->queue->ehci,
"guest requested more bytes than allowed");
return -1;
}
if (!ehci_verify_pid(p->queue, &p->qtd)) {
ehci_queue_stopped(p->queue); /* Mark the ep in the prev dir stopped */
}
p->pid = ehci_get_pid(&p->qtd);
p->queue->last_pid = p->pid;
endp = get_field(p->queue->qh.epchar, QH_EPCHAR_EP);
ep = usb_ep_get(p->queue->dev, p->pid, endp);
if (p->async == EHCI_ASYNC_NONE) {
if (ehci_init_transfer(p) != 0) {
return -1;
}
spd = (p->pid == USB_TOKEN_IN && NLPTR_TBIT(p->qtd.altnext) == 0);
usb_packet_setup(&p->packet, p->pid, ep, 0, p->qtdaddr, spd,
(p->qtd.token & QTD_TOKEN_IOC) != 0);
usb_packet_map(&p->packet, &p->sgl);
p->async = EHCI_ASYNC_INITIALIZED;
}
trace_usb_ehci_packet_action(p->queue, p, action);
usb_handle_packet(p->queue->dev, &p->packet);
DPRINTF("submit: qh 0x%x next 0x%x qtd 0x%x pid 0x%x len %zd endp 0x%x "
"status %d actual_length %d\n", p->queue->qhaddr, p->qtd.next,
p->qtdaddr, p->pid, p->packet.iov.size, endp, p->packet.status,
p->packet.actual_length);
if (p->packet.actual_length > BUFF_SIZE) {
fprintf(stderr, "ret from usb_handle_packet > BUFF_SIZE\n");
return -1;
}
return 1;
}
/* 4.7.2
*/
static int ehci_process_itd(EHCIState *ehci,
EHCIitd *itd,
uint32_t addr)
{
USBDevice *dev;
USBEndpoint *ep;
uint32_t i, len, pid, dir, devaddr, endp;
uint32_t pg, off, ptr1, ptr2, max, mult;
ehci->periodic_sched_active = PERIODIC_ACTIVE;
dir =(itd->bufptr[1] & ITD_BUFPTR_DIRECTION);
devaddr = get_field(itd->bufptr[0], ITD_BUFPTR_DEVADDR);
endp = get_field(itd->bufptr[0], ITD_BUFPTR_EP);
max = get_field(itd->bufptr[1], ITD_BUFPTR_MAXPKT);
mult = get_field(itd->bufptr[2], ITD_BUFPTR_MULT);
for(i = 0; i < 8; i++) {
if (itd->transact[i] & ITD_XACT_ACTIVE) {
pg = get_field(itd->transact[i], ITD_XACT_PGSEL);
off = itd->transact[i] & ITD_XACT_OFFSET_MASK;
ptr1 = (itd->bufptr[pg] & ITD_BUFPTR_MASK);
ptr2 = (itd->bufptr[pg+1] & ITD_BUFPTR_MASK);
len = get_field(itd->transact[i], ITD_XACT_LENGTH);
if (len > max * mult) {
len = max * mult;
}
if (len > BUFF_SIZE) {
return -1;
}
qemu_sglist_init(&ehci->isgl, 2, ehci->dma);
if (off + len > 4096) {
/* transfer crosses page border */
uint32_t len2 = off + len - 4096;
uint32_t len1 = len - len2;
qemu_sglist_add(&ehci->isgl, ptr1 + off, len1);
qemu_sglist_add(&ehci->isgl, ptr2, len2);
} else {
qemu_sglist_add(&ehci->isgl, ptr1 + off, len);
}
pid = dir ? USB_TOKEN_IN : USB_TOKEN_OUT;
dev = ehci_find_device(ehci, devaddr);
ep = usb_ep_get(dev, pid, endp);
if (ep && ep->type == USB_ENDPOINT_XFER_ISOC) {
usb_packet_setup(&ehci->ipacket, pid, ep, 0, addr, false,
(itd->transact[i] & ITD_XACT_IOC) != 0);
usb_packet_map(&ehci->ipacket, &ehci->isgl);
usb_handle_packet(dev, &ehci->ipacket);
usb_packet_unmap(&ehci->ipacket, &ehci->isgl);
} else {
DPRINTF("ISOCH: attempt to addess non-iso endpoint\n");
ehci->ipacket.status = USB_RET_NAK;
ehci->ipacket.actual_length = 0;
}
qemu_sglist_destroy(&ehci->isgl);
switch (ehci->ipacket.status) {
case USB_RET_SUCCESS:
break;
default:
fprintf(stderr, "Unexpected iso usb result: %d\n",
ehci->ipacket.status);
/* Fall through */
case USB_RET_IOERROR:
case USB_RET_NODEV:
/* 3.3.2: XACTERR is only allowed on IN transactions */
if (dir) {
itd->transact[i] |= ITD_XACT_XACTERR;
ehci_raise_irq(ehci, USBSTS_ERRINT);
}
break;
case USB_RET_BABBLE:
itd->transact[i] |= ITD_XACT_BABBLE;
ehci_raise_irq(ehci, USBSTS_ERRINT);
break;
case USB_RET_NAK:
/* no data for us, so do a zero-length transfer */
ehci->ipacket.actual_length = 0;
break;
}
if (!dir) {
set_field(&itd->transact[i], len - ehci->ipacket.actual_length,
ITD_XACT_LENGTH); /* OUT */
} else {
set_field(&itd->transact[i], ehci->ipacket.actual_length,
ITD_XACT_LENGTH); /* IN */
}
if (itd->transact[i] & ITD_XACT_IOC) {
ehci_raise_irq(ehci, USBSTS_INT);
}
itd->transact[i] &= ~ITD_XACT_ACTIVE;
}
}
return 0;
}
/* This state is the entry point for asynchronous schedule
* processing. Entry here consitutes a EHCI start event state (4.8.5)
*/
static int ehci_state_waitlisthead(EHCIState *ehci, int async)
{
EHCIqh qh;
int i = 0;
int again = 0;
uint32_t entry = ehci->asynclistaddr;
/* set reclamation flag at start event (4.8.6) */
if (async) {
ehci_set_usbsts(ehci, USBSTS_REC);
}
ehci_queues_rip_unused(ehci, async);
/* Find the head of the list (4.9.1.1) */
for(i = 0; i < MAX_QH; i++) {
if (get_dwords(ehci, NLPTR_GET(entry), (uint32_t *) &qh,
sizeof(EHCIqh) >> 2) < 0) {
return 0;
}
ehci_trace_qh(NULL, NLPTR_GET(entry), &qh);
if (qh.epchar & QH_EPCHAR_H) {
if (async) {
entry |= (NLPTR_TYPE_QH << 1);
}
ehci_set_fetch_addr(ehci, async, entry);
ehci_set_state(ehci, async, EST_FETCHENTRY);
again = 1;
goto out;
}
entry = qh.next;
if (entry == ehci->asynclistaddr) {
break;
}
}
/* no head found for list. */
ehci_set_state(ehci, async, EST_ACTIVE);
out:
return again;
}
/* This state is the entry point for periodic schedule processing as
* well as being a continuation state for async processing.
*/
static int ehci_state_fetchentry(EHCIState *ehci, int async)
{
int again = 0;
uint32_t entry = ehci_get_fetch_addr(ehci, async);
if (NLPTR_TBIT(entry)) {
ehci_set_state(ehci, async, EST_ACTIVE);
goto out;
}
/* section 4.8, only QH in async schedule */
if (async && (NLPTR_TYPE_GET(entry) != NLPTR_TYPE_QH)) {
fprintf(stderr, "non queue head request in async schedule\n");
return -1;
}
switch (NLPTR_TYPE_GET(entry)) {
case NLPTR_TYPE_QH:
ehci_set_state(ehci, async, EST_FETCHQH);
again = 1;
break;
case NLPTR_TYPE_ITD:
ehci_set_state(ehci, async, EST_FETCHITD);
again = 1;
break;
case NLPTR_TYPE_STITD:
ehci_set_state(ehci, async, EST_FETCHSITD);
again = 1;
break;
default:
/* TODO: handle FSTN type */
fprintf(stderr, "FETCHENTRY: entry at %X is of type %d "
"which is not supported yet\n", entry, NLPTR_TYPE_GET(entry));
return -1;
}
out:
return again;
}
static EHCIQueue *ehci_state_fetchqh(EHCIState *ehci, int async)
{
uint32_t entry;
EHCIQueue *q;
EHCIqh qh;
entry = ehci_get_fetch_addr(ehci, async);
q = ehci_find_queue_by_qh(ehci, entry, async);
if (NULL == q) {
q = ehci_alloc_queue(ehci, entry, async);
}
q->seen++;
if (q->seen > 1) {
/* we are going in circles -- stop processing */
ehci_set_state(ehci, async, EST_ACTIVE);
q = NULL;
goto out;
}
if (get_dwords(ehci, NLPTR_GET(q->qhaddr),
(uint32_t *) &qh, sizeof(EHCIqh) >> 2) < 0) {
q = NULL;
goto out;
}
ehci_trace_qh(q, NLPTR_GET(q->qhaddr), &qh);
/*
* The overlay area of the qh should never be changed by the guest,
* except when idle, in which case the reset is a nop.
*/
if (!ehci_verify_qh(q, &qh)) {
if (ehci_reset_queue(q) > 0) {
ehci_trace_guest_bug(ehci, "guest updated active QH");
}
}
q->qh = qh;
q->transact_ctr = get_field(q->qh.epcap, QH_EPCAP_MULT);
if (q->transact_ctr == 0) { /* Guest bug in some versions of windows */
q->transact_ctr = 4;
}
if (q->dev == NULL) {
q->dev = ehci_find_device(q->ehci,
get_field(q->qh.epchar, QH_EPCHAR_DEVADDR));
}
if (async && (q->qh.epchar & QH_EPCHAR_H)) {
/* EHCI spec version 1.0 Section 4.8.3 & 4.10.1 */
if (ehci->usbsts & USBSTS_REC) {
ehci_clear_usbsts(ehci, USBSTS_REC);
} else {
DPRINTF("FETCHQH: QH 0x%08x. H-bit set, reclamation status reset"
" - done processing\n", q->qhaddr);
ehci_set_state(ehci, async, EST_ACTIVE);
q = NULL;
goto out;
}
}
#if EHCI_DEBUG
if (q->qhaddr != q->qh.next) {
DPRINTF("FETCHQH: QH 0x%08x (h %x halt %x active %x) next 0x%08x\n",
q->qhaddr,
q->qh.epchar & QH_EPCHAR_H,
q->qh.token & QTD_TOKEN_HALT,
q->qh.token & QTD_TOKEN_ACTIVE,
q->qh.next);
}
#endif
if (q->qh.token & QTD_TOKEN_HALT) {
ehci_set_state(ehci, async, EST_HORIZONTALQH);
} else if ((q->qh.token & QTD_TOKEN_ACTIVE) &&
(NLPTR_TBIT(q->qh.current_qtd) == 0)) {
q->qtdaddr = q->qh.current_qtd;
ehci_set_state(ehci, async, EST_FETCHQTD);
} else {
/* EHCI spec version 1.0 Section 4.10.2 */
ehci_set_state(ehci, async, EST_ADVANCEQUEUE);
}
out:
return q;
}
static int ehci_state_fetchitd(EHCIState *ehci, int async)
{
uint32_t entry;
EHCIitd itd;
assert(!async);
entry = ehci_get_fetch_addr(ehci, async);
if (get_dwords(ehci, NLPTR_GET(entry), (uint32_t *) &itd,
sizeof(EHCIitd) >> 2) < 0) {
return -1;
}
ehci_trace_itd(ehci, entry, &itd);
if (ehci_process_itd(ehci, &itd, entry) != 0) {
return -1;
}
put_dwords(ehci, NLPTR_GET(entry), (uint32_t *) &itd,
sizeof(EHCIitd) >> 2);
ehci_set_fetch_addr(ehci, async, itd.next);
ehci_set_state(ehci, async, EST_FETCHENTRY);
return 1;
}
static int ehci_state_fetchsitd(EHCIState *ehci, int async)
{
uint32_t entry;
EHCIsitd sitd;
assert(!async);
entry = ehci_get_fetch_addr(ehci, async);
if (get_dwords(ehci, NLPTR_GET(entry), (uint32_t *)&sitd,
sizeof(EHCIsitd) >> 2) < 0) {
return 0;
}
ehci_trace_sitd(ehci, entry, &sitd);
if (!(sitd.results & SITD_RESULTS_ACTIVE)) {
/* siTD is not active, nothing to do */;
} else {
/* TODO: split transfers are not implemented */
fprintf(stderr, "WARNING: Skipping active siTD\n");
}
ehci_set_fetch_addr(ehci, async, sitd.next);
ehci_set_state(ehci, async, EST_FETCHENTRY);
return 1;
}
/* Section 4.10.2 - paragraph 3 */
static int ehci_state_advqueue(EHCIQueue *q)
{
#if 0
/* TO-DO: 4.10.2 - paragraph 2
* if I-bit is set to 1 and QH is not active
* go to horizontal QH
*/
if (I-bit set) {
ehci_set_state(ehci, async, EST_HORIZONTALQH);
goto out;
}
#endif
/*
* want data and alt-next qTD is valid
*/
if (((q->qh.token & QTD_TOKEN_TBYTES_MASK) != 0) &&
(NLPTR_TBIT(q->qh.altnext_qtd) == 0)) {
q->qtdaddr = q->qh.altnext_qtd;
ehci_set_state(q->ehci, q->async, EST_FETCHQTD);
/*
* next qTD is valid
*/
} else if (NLPTR_TBIT(q->qh.next_qtd) == 0) {
q->qtdaddr = q->qh.next_qtd;
ehci_set_state(q->ehci, q->async, EST_FETCHQTD);
/*
* no valid qTD, try next QH
*/
} else {
ehci_set_state(q->ehci, q->async, EST_HORIZONTALQH);
}
return 1;
}
/* Section 4.10.2 - paragraph 4 */
static int ehci_state_fetchqtd(EHCIQueue *q)
{
EHCIqtd qtd;
EHCIPacket *p;
int again = 1;
if (get_dwords(q->ehci, NLPTR_GET(q->qtdaddr), (uint32_t *) &qtd,
sizeof(EHCIqtd) >> 2) < 0) {
return 0;
}
ehci_trace_qtd(q, NLPTR_GET(q->qtdaddr), &qtd);
p = QTAILQ_FIRST(&q->packets);
if (p != NULL) {
if (!ehci_verify_qtd(p, &qtd)) {
ehci_cancel_queue(q);
if (qtd.token & QTD_TOKEN_ACTIVE) {
ehci_trace_guest_bug(q->ehci, "guest updated active qTD");
}
p = NULL;
} else {
p->qtd = qtd;
ehci_qh_do_overlay(q);
}
}
if (!(qtd.token & QTD_TOKEN_ACTIVE)) {
ehci_set_state(q->ehci, q->async, EST_HORIZONTALQH);
} else if (p != NULL) {
switch (p->async) {
case EHCI_ASYNC_NONE:
case EHCI_ASYNC_INITIALIZED:
/* Not yet executed (MULT), or previously nacked (int) packet */
ehci_set_state(q->ehci, q->async, EST_EXECUTE);
break;
case EHCI_ASYNC_INFLIGHT:
/* Check if the guest has added new tds to the queue */
again = ehci_fill_queue(QTAILQ_LAST(&q->packets, pkts_head));
/* Unfinished async handled packet, go horizontal */
ehci_set_state(q->ehci, q->async, EST_HORIZONTALQH);
break;
case EHCI_ASYNC_FINISHED:
/* Complete executing of the packet */
ehci_set_state(q->ehci, q->async, EST_EXECUTING);
break;
}
} else {
p = ehci_alloc_packet(q);
p->qtdaddr = q->qtdaddr;
p->qtd = qtd;
ehci_set_state(q->ehci, q->async, EST_EXECUTE);
}
return again;
}
static int ehci_state_horizqh(EHCIQueue *q)
{
int again = 0;
if (ehci_get_fetch_addr(q->ehci, q->async) != q->qh.next) {
ehci_set_fetch_addr(q->ehci, q->async, q->qh.next);
ehci_set_state(q->ehci, q->async, EST_FETCHENTRY);
again = 1;
} else {
ehci_set_state(q->ehci, q->async, EST_ACTIVE);
}
return again;
}
/* Returns "again" */
static int ehci_fill_queue(EHCIPacket *p)
{
USBEndpoint *ep = p->packet.ep;
EHCIQueue *q = p->queue;
EHCIqtd qtd = p->qtd;
uint32_t qtdaddr;
for (;;) {
if (NLPTR_TBIT(qtd.next) != 0) {
break;
}
qtdaddr = qtd.next;
/*
* Detect circular td lists, Windows creates these, counting on the
* active bit going low after execution to make the queue stop.
*/
QTAILQ_FOREACH(p, &q->packets, next) {
if (p->qtdaddr == qtdaddr) {
goto leave;
}
}
if (get_dwords(q->ehci, NLPTR_GET(qtdaddr),
(uint32_t *) &qtd, sizeof(EHCIqtd) >> 2) < 0) {
return -1;
}
ehci_trace_qtd(q, NLPTR_GET(qtdaddr), &qtd);
if (!(qtd.token & QTD_TOKEN_ACTIVE)) {
break;
}
if (!ehci_verify_pid(q, &qtd)) {
ehci_trace_guest_bug(q->ehci, "guest queued token with wrong pid");
break;
}
p = ehci_alloc_packet(q);
p->qtdaddr = qtdaddr;
p->qtd = qtd;
if (ehci_execute(p, "queue") == -1) {
return -1;
}
assert(p->packet.status == USB_RET_ASYNC);
p->async = EHCI_ASYNC_INFLIGHT;
}
leave:
usb_device_flush_ep_queue(ep->dev, ep);
return 1;
}
static int ehci_state_execute(EHCIQueue *q)
{
EHCIPacket *p = QTAILQ_FIRST(&q->packets);
int again = 0;
assert(p != NULL);
assert(p->qtdaddr == q->qtdaddr);
if (ehci_qh_do_overlay(q) != 0) {
return -1;
}
// TODO verify enough time remains in the uframe as in 4.4.1.1
// TODO write back ptr to async list when done or out of time
/* 4.10.3, bottom of page 82, go horizontal on transaction counter == 0 */
if (!q->async && q->transact_ctr == 0) {
ehci_set_state(q->ehci, q->async, EST_HORIZONTALQH);
again = 1;
goto out;
}
if (q->async) {
ehci_set_usbsts(q->ehci, USBSTS_REC);
}
again = ehci_execute(p, "process");
if (again == -1) {
goto out;
}
if (p->packet.status == USB_RET_ASYNC) {
ehci_flush_qh(q);
trace_usb_ehci_packet_action(p->queue, p, "async");
p->async = EHCI_ASYNC_INFLIGHT;
ehci_set_state(q->ehci, q->async, EST_HORIZONTALQH);
if (q->async) {
again = ehci_fill_queue(p);
} else {
again = 1;
}
goto out;
}
ehci_set_state(q->ehci, q->async, EST_EXECUTING);
again = 1;
out:
return again;
}
static int ehci_state_executing(EHCIQueue *q)
{
EHCIPacket *p = QTAILQ_FIRST(&q->packets);
assert(p != NULL);
assert(p->qtdaddr == q->qtdaddr);
ehci_execute_complete(q);
/* 4.10.3 */
if (!q->async && q->transact_ctr > 0) {
q->transact_ctr--;
}
/* 4.10.5 */
if (p->packet.status == USB_RET_NAK) {
ehci_set_state(q->ehci, q->async, EST_HORIZONTALQH);
} else {
ehci_set_state(q->ehci, q->async, EST_WRITEBACK);
}
ehci_flush_qh(q);
return 1;
}
static int ehci_state_writeback(EHCIQueue *q)
{
EHCIPacket *p = QTAILQ_FIRST(&q->packets);
uint32_t *qtd, addr;
int again = 0;
/* Write back the QTD from the QH area */
assert(p != NULL);
assert(p->qtdaddr == q->qtdaddr);
ehci_trace_qtd(q, NLPTR_GET(p->qtdaddr), (EHCIqtd *) &q->qh.next_qtd);
qtd = (uint32_t *) &q->qh.next_qtd;
addr = NLPTR_GET(p->qtdaddr);
put_dwords(q->ehci, addr + 2 * sizeof(uint32_t), qtd + 2, 2);
ehci_free_packet(p);
/*
* EHCI specs say go horizontal here.
*
* We can also advance the queue here for performance reasons. We
* need to take care to only take that shortcut in case we've
* processed the qtd just written back without errors, i.e. halt
* bit is clear.
*/
if (q->qh.token & QTD_TOKEN_HALT) {
ehci_set_state(q->ehci, q->async, EST_HORIZONTALQH);
again = 1;
} else {
ehci_set_state(q->ehci, q->async, EST_ADVANCEQUEUE);
again = 1;
}
return again;
}
/*
* This is the state machine that is common to both async and periodic
*/
static void ehci_advance_state(EHCIState *ehci, int async)
{
EHCIQueue *q = NULL;
int again;
do {
switch(ehci_get_state(ehci, async)) {
case EST_WAITLISTHEAD:
again = ehci_state_waitlisthead(ehci, async);
break;
case EST_FETCHENTRY:
again = ehci_state_fetchentry(ehci, async);
break;
case EST_FETCHQH:
q = ehci_state_fetchqh(ehci, async);
if (q != NULL) {
assert(q->async == async);
again = 1;
} else {
again = 0;
}
break;
case EST_FETCHITD:
again = ehci_state_fetchitd(ehci, async);
break;
case EST_FETCHSITD:
again = ehci_state_fetchsitd(ehci, async);
break;
case EST_ADVANCEQUEUE:
assert(q != NULL);
again = ehci_state_advqueue(q);
break;
case EST_FETCHQTD:
assert(q != NULL);
again = ehci_state_fetchqtd(q);
break;
case EST_HORIZONTALQH:
assert(q != NULL);
again = ehci_state_horizqh(q);
break;
case EST_EXECUTE:
assert(q != NULL);
again = ehci_state_execute(q);
if (async) {
ehci->async_stepdown = 0;
}
break;
case EST_EXECUTING:
assert(q != NULL);
if (async) {
ehci->async_stepdown = 0;
}
again = ehci_state_executing(q);
break;
case EST_WRITEBACK:
assert(q != NULL);
again = ehci_state_writeback(q);
if (!async) {
ehci->periodic_sched_active = PERIODIC_ACTIVE;
}
break;
default:
fprintf(stderr, "Bad state!\n");
again = -1;
assert(0);
break;
}
if (again < 0) {
fprintf(stderr, "processing error - resetting ehci HC\n");
ehci_reset(ehci);
again = 0;
}
}
while (again);
}
static void ehci_advance_async_state(EHCIState *ehci)
{
const int async = 1;
switch(ehci_get_state(ehci, async)) {
case EST_INACTIVE:
if (!ehci_async_enabled(ehci)) {
break;
}
ehci_set_state(ehci, async, EST_ACTIVE);
// No break, fall through to ACTIVE
case EST_ACTIVE:
if (!ehci_async_enabled(ehci)) {
ehci_queues_rip_all(ehci, async);
ehci_set_state(ehci, async, EST_INACTIVE);
break;
}
/* make sure guest has acknowledged the doorbell interrupt */
/* TO-DO: is this really needed? */
if (ehci->usbsts & USBSTS_IAA) {
DPRINTF("IAA status bit still set.\n");
break;
}
/* check that address register has been set */
if (ehci->asynclistaddr == 0) {
break;
}
ehci_set_state(ehci, async, EST_WAITLISTHEAD);
ehci_advance_state(ehci, async);
/* If the doorbell is set, the guest wants to make a change to the
* schedule. The host controller needs to release cached data.
* (section 4.8.2)
*/
if (ehci->usbcmd & USBCMD_IAAD) {
/* Remove all unseen qhs from the async qhs queue */
ehci_queues_rip_unseen(ehci, async);
trace_usb_ehci_doorbell_ack();
ehci->usbcmd &= ~USBCMD_IAAD;
ehci_raise_irq(ehci, USBSTS_IAA);
}
break;
default:
/* this should only be due to a developer mistake */
fprintf(stderr, "ehci: Bad asynchronous state %d. "
"Resetting to active\n", ehci->astate);
assert(0);
}
}
static void ehci_advance_periodic_state(EHCIState *ehci)
{
uint32_t entry;
uint32_t list;
const int async = 0;
// 4.6
switch(ehci_get_state(ehci, async)) {
case EST_INACTIVE:
if (!(ehci->frindex & 7) && ehci_periodic_enabled(ehci)) {
ehci_set_state(ehci, async, EST_ACTIVE);
// No break, fall through to ACTIVE
} else
break;
case EST_ACTIVE:
if (!(ehci->frindex & 7) && !ehci_periodic_enabled(ehci)) {
ehci_queues_rip_all(ehci, async);
ehci_set_state(ehci, async, EST_INACTIVE);
break;
}
list = ehci->periodiclistbase & 0xfffff000;
/* check that register has been set */
if (list == 0) {
break;
}
list |= ((ehci->frindex & 0x1ff8) >> 1);
if (get_dwords(ehci, list, &entry, 1) < 0) {
break;
}
DPRINTF("PERIODIC state adv fr=%d. [%08X] -> %08X\n",
ehci->frindex / 8, list, entry);
ehci_set_fetch_addr(ehci, async,entry);
ehci_set_state(ehci, async, EST_FETCHENTRY);
ehci_advance_state(ehci, async);
ehci_queues_rip_unused(ehci, async);
break;
default:
/* this should only be due to a developer mistake */
fprintf(stderr, "ehci: Bad periodic state %d. "
"Resetting to active\n", ehci->pstate);
assert(0);
}
}
static void ehci_update_frindex(EHCIState *ehci, int uframes)
{
int i;
if (!ehci_enabled(ehci) && ehci->pstate == EST_INACTIVE) {
return;
}
for (i = 0; i < uframes; i++) {
ehci->frindex++;
if (ehci->frindex == 0x00002000) {
ehci_raise_irq(ehci, USBSTS_FLR);
}
if (ehci->frindex == 0x00004000) {
ehci_raise_irq(ehci, USBSTS_FLR);
ehci->frindex = 0;
if (ehci->usbsts_frindex >= 0x00004000) {
ehci->usbsts_frindex -= 0x00004000;
} else {
ehci->usbsts_frindex = 0;
}
}
}
}
static void ehci_frame_timer(void *opaque)
{
EHCIState *ehci = opaque;
int need_timer = 0;
int64_t expire_time, t_now;
uint64_t ns_elapsed;
int uframes, skipped_uframes;
int i;
t_now = qemu_get_clock_ns(vm_clock);
ns_elapsed = t_now - ehci->last_run_ns;
uframes = ns_elapsed / UFRAME_TIMER_NS;
if (ehci_periodic_enabled(ehci) || ehci->pstate != EST_INACTIVE) {
need_timer++;
if (uframes > (ehci->maxframes * 8)) {
skipped_uframes = uframes - (ehci->maxframes * 8);
ehci_update_frindex(ehci, skipped_uframes);
ehci->last_run_ns += UFRAME_TIMER_NS * skipped_uframes;
uframes -= skipped_uframes;
DPRINTF("WARNING - EHCI skipped %d uframes\n", skipped_uframes);
}
for (i = 0; i < uframes; i++) {
/*
* If we're running behind schedule, we should not catch up
* too fast, as that will make some guests unhappy:
* 1) We must process a minimum of MIN_UFR_PER_TICK frames,
* otherwise we will never catch up
* 2) Process frames until the guest has requested an irq (IOC)
*/
if (i >= MIN_UFR_PER_TICK) {
ehci_commit_irq(ehci);
if ((ehci->usbsts & USBINTR_MASK) & ehci->usbintr) {
break;
}
}
if (ehci->periodic_sched_active) {
ehci->periodic_sched_active--;
}
ehci_update_frindex(ehci, 1);
if ((ehci->frindex & 7) == 0) {
ehci_advance_periodic_state(ehci);
}
ehci->last_run_ns += UFRAME_TIMER_NS;
}
} else {
ehci->periodic_sched_active = 0;
ehci_update_frindex(ehci, uframes);
ehci->last_run_ns += UFRAME_TIMER_NS * uframes;
}
if (ehci->periodic_sched_active) {
ehci->async_stepdown = 0;
} else if (ehci->async_stepdown < ehci->maxframes / 2) {
ehci->async_stepdown++;
}
/* Async is not inside loop since it executes everything it can once
* called
*/
if (ehci_async_enabled(ehci) || ehci->astate != EST_INACTIVE) {
need_timer++;
ehci_advance_async_state(ehci);
}
ehci_commit_irq(ehci);
if (ehci->usbsts_pending) {
need_timer++;
ehci->async_stepdown = 0;
}
if (ehci_enabled(ehci) && (ehci->usbintr & USBSTS_FLR)) {
need_timer++;
}
if (need_timer) {
/* If we've raised int, we speed up the timer, so that we quickly
* notice any new packets queued up in response */
if (ehci->int_req_by_async && (ehci->usbsts & USBSTS_INT)) {
expire_time = t_now + get_ticks_per_sec() / (FRAME_TIMER_FREQ * 4);
ehci->int_req_by_async = false;
} else {
expire_time = t_now + (get_ticks_per_sec()
* (ehci->async_stepdown+1) / FRAME_TIMER_FREQ);
}
qemu_mod_timer(ehci->frame_timer, expire_time);
}
}
static const MemoryRegionOps ehci_mmio_caps_ops = {
.read = ehci_caps_read,
.valid.min_access_size = 1,
.valid.max_access_size = 4,
.impl.min_access_size = 1,
.impl.max_access_size = 1,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static const MemoryRegionOps ehci_mmio_opreg_ops = {
.read = ehci_opreg_read,
.write = ehci_opreg_write,
.valid.min_access_size = 4,
.valid.max_access_size = 4,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static const MemoryRegionOps ehci_mmio_port_ops = {
.read = ehci_port_read,
.write = ehci_port_write,
.valid.min_access_size = 4,
.valid.max_access_size = 4,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static USBPortOps ehci_port_ops = {
.attach = ehci_attach,
.detach = ehci_detach,
.child_detach = ehci_child_detach,
.wakeup = ehci_wakeup,
.complete = ehci_async_complete_packet,
};
static USBBusOps ehci_bus_ops = {
.register_companion = ehci_register_companion,
.wakeup_endpoint = ehci_wakeup_endpoint,
};
static void usb_ehci_pre_save(void *opaque)
{
EHCIState *ehci = opaque;
uint32_t new_frindex;
/* Round down frindex to a multiple of 8 for migration compatibility */
new_frindex = ehci->frindex & ~7;
ehci->last_run_ns -= (ehci->frindex - new_frindex) * UFRAME_TIMER_NS;
ehci->frindex = new_frindex;
}
static int usb_ehci_post_load(void *opaque, int version_id)
{
EHCIState *s = opaque;
int i;
for (i = 0; i < NB_PORTS; i++) {
USBPort *companion = s->companion_ports[i];
if (companion == NULL) {
continue;
}
if (s->portsc[i] & PORTSC_POWNER) {
companion->dev = s->ports[i].dev;
} else {
companion->dev = NULL;
}
}
return 0;
}
static void usb_ehci_vm_state_change(void *opaque, int running, RunState state)
{
EHCIState *ehci = opaque;
/*
* We don't migrate the EHCIQueue-s, instead we rebuild them for the
* schedule in guest memory. We must do the rebuilt ASAP, so that
* USB-devices which have async handled packages have a packet in the
* ep queue to match the completion with.
*/
if (state == RUN_STATE_RUNNING) {
ehci_advance_async_state(ehci);
}
/*
* The schedule rebuilt from guest memory could cause the migration dest
* to miss a QH unlink, and fail to cancel packets, since the unlinked QH
* will never have existed on the destination. Therefor we must flush the
* async schedule on savevm to catch any not yet noticed unlinks.
*/
if (state == RUN_STATE_SAVE_VM) {
ehci_advance_async_state(ehci);
ehci_queues_rip_unseen(ehci, 1);
}
}
const VMStateDescription vmstate_ehci = {
.name = "ehci-core",
.version_id = 2,
.minimum_version_id = 1,
.pre_save = usb_ehci_pre_save,
.post_load = usb_ehci_post_load,
.fields = (VMStateField[]) {
/* mmio registers */
VMSTATE_UINT32(usbcmd, EHCIState),
VMSTATE_UINT32(usbsts, EHCIState),
VMSTATE_UINT32_V(usbsts_pending, EHCIState, 2),
VMSTATE_UINT32_V(usbsts_frindex, EHCIState, 2),
VMSTATE_UINT32(usbintr, EHCIState),
VMSTATE_UINT32(frindex, EHCIState),
VMSTATE_UINT32(ctrldssegment, EHCIState),
VMSTATE_UINT32(periodiclistbase, EHCIState),
VMSTATE_UINT32(asynclistaddr, EHCIState),
VMSTATE_UINT32(configflag, EHCIState),
VMSTATE_UINT32(portsc[0], EHCIState),
VMSTATE_UINT32(portsc[1], EHCIState),
VMSTATE_UINT32(portsc[2], EHCIState),
VMSTATE_UINT32(portsc[3], EHCIState),
VMSTATE_UINT32(portsc[4], EHCIState),
VMSTATE_UINT32(portsc[5], EHCIState),
/* frame timer */
VMSTATE_TIMER(frame_timer, EHCIState),
VMSTATE_UINT64(last_run_ns, EHCIState),
VMSTATE_UINT32(async_stepdown, EHCIState),
/* schedule state */
VMSTATE_UINT32(astate, EHCIState),
VMSTATE_UINT32(pstate, EHCIState),
VMSTATE_UINT32(a_fetch_addr, EHCIState),
VMSTATE_UINT32(p_fetch_addr, EHCIState),
VMSTATE_END_OF_LIST()
}
};
void usb_ehci_initfn(EHCIState *s, DeviceState *dev)
{
int i;
/* 2.2 host controller interface version */
s->caps[0x00] = (uint8_t)(s->opregbase - s->capsbase);
s->caps[0x01] = 0x00;
s->caps[0x02] = 0x00;
s->caps[0x03] = 0x01; /* HC version */
s->caps[0x04] = NB_PORTS; /* Number of downstream ports */
s->caps[0x05] = 0x00; /* No companion ports at present */
s->caps[0x06] = 0x00;
s->caps[0x07] = 0x00;
s->caps[0x08] = 0x80; /* We can cache whole frame, no 64-bit */
s->caps[0x0a] = 0x00;
s->caps[0x0b] = 0x00;
usb_bus_new(&s->bus, &ehci_bus_ops, dev);
for(i = 0; i < NB_PORTS; i++) {
usb_register_port(&s->bus, &s->ports[i], s, i, &ehci_port_ops,
USB_SPEED_MASK_HIGH);
s->ports[i].dev = 0;
}
s->frame_timer = qemu_new_timer_ns(vm_clock, ehci_frame_timer, s);
s->async_bh = qemu_bh_new(ehci_frame_timer, s);
QTAILQ_INIT(&s->aqueues);
QTAILQ_INIT(&s->pqueues);
usb_packet_init(&s->ipacket);
qemu_register_reset(ehci_reset, s);
qemu_add_vm_change_state_handler(usb_ehci_vm_state_change, s);
memory_region_init(&s->mem, "ehci", MMIO_SIZE);
memory_region_init_io(&s->mem_caps, &ehci_mmio_caps_ops, s,
"capabilities", CAPA_SIZE);
memory_region_init_io(&s->mem_opreg, &ehci_mmio_opreg_ops, s,
"operational", PORTSC_BEGIN);
memory_region_init_io(&s->mem_ports, &ehci_mmio_port_ops, s,
"ports", PORTSC_END - PORTSC_BEGIN);
memory_region_add_subregion(&s->mem, s->capsbase, &s->mem_caps);
memory_region_add_subregion(&s->mem, s->opregbase, &s->mem_opreg);
memory_region_add_subregion(&s->mem, s->opregbase + PORTSC_BEGIN,
&s->mem_ports);
}
/*
* vim: expandtab ts=4
*/
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