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minix/drivers/pci/main.c
Cristiano Giuffrida 48c6bb79f4 Driver refactory for live update and crash recovery. 
SYSLIB CHANGES:
- DS calls to publish / retrieve labels consider endpoints instead of u32_t.

VFS CHANGES:
- mapdriver() only adds an entry in the dmap table in VFS.
- dev_up() is only executed upon reception of a driver up event.

INET CHANGES:
- INET no longer searches for existing drivers instances at startup.
- A newtwork driver is (re)initialized upon reception of a driver up event.
- Networking startup is now race-free by design. No need to waste 5 seconds
at startup any more.

DRIVER CHANGES:
- Every driver publishes driver up events when starting for the first time or
in case of restart when recovery actions must be taken in the upper layers.
- Driver up events are published by drivers through DS. 
- For regular drivers, VFS is normally the only subscriber, but not necessarily.
For instance, when the filter driver is in use, it must subscribe to driver
up events to initiate recovery.
- For network drivers, inet is the only subscriber for now.
- Every VFS driver is statically linked with libdriver, every network driver
is statically linked with libnetdriver.

DRIVER LIBRARIES CHANGES:
- Libdriver is extended to provide generic receive() and ds_publish() interfaces
for VFS drivers.
- driver_receive() is a wrapper for sef_receive() also used in driver_task()
to discard spurious messages that were meant to be delivered to a previous
version of the driver.
- driver_receive_mq() is the same as driver_receive() but integrates support
for queued messages.
- driver_announce() publishes a driver up event for VFS drivers and marks
the driver as initialized and expecting a DEV_OPEN message.
- Libnetdriver is introduced to provide similar receive() and ds_publish()
interfaces for network drivers (netdriver_announce() and netdriver_receive()).
- Network drivers all support live update with no state transfer now.

KERNEL CHANGES:
- Added kernel call statectl for state management. Used by driver_announce() to
unblock eventual callers sendrecing to the driver.
2010-04-08 13:41:35 +00:00

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/*
main.c
*/
#include "pci.h"
PUBLIC struct pci_acl pci_acl[NR_DRIVERS];
FORWARD _PROTOTYPE( void do_init, (message *mp) );
FORWARD _PROTOTYPE( void do_first_dev, (message *mp) );
FORWARD _PROTOTYPE( void do_next_dev, (message *mp) );
FORWARD _PROTOTYPE( void do_find_dev, (message *mp) );
FORWARD _PROTOTYPE( void do_ids, (message *mp) );
FORWARD _PROTOTYPE( void do_dev_name, (message *mp) );
FORWARD _PROTOTYPE( void do_dev_name_s, (message *mp) );
FORWARD _PROTOTYPE( void do_slot_name_s, (message *mp) );
FORWARD _PROTOTYPE( void do_set_acl, (message *mp) );
FORWARD _PROTOTYPE( void do_del_acl, (message *mp) );
FORWARD _PROTOTYPE( void do_reserve, (message *mp) );
FORWARD _PROTOTYPE( void do_attr_r8, (message *mp) );
FORWARD _PROTOTYPE( void do_attr_r16, (message *mp) );
FORWARD _PROTOTYPE( void do_attr_r32, (message *mp) );
FORWARD _PROTOTYPE( void do_attr_w8, (message *mp) );
FORWARD _PROTOTYPE( void do_attr_w16, (message *mp) );
FORWARD _PROTOTYPE( void do_attr_w32, (message *mp) );
FORWARD _PROTOTYPE( void do_rescan_bus, (message *mp) );
FORWARD _PROTOTYPE( void reply, (message *mp, int result) );
FORWARD _PROTOTYPE( struct rs_pci *find_acl, (int endpoint) );
extern int debug;
/* SEF functions and variables. */
FORWARD _PROTOTYPE( void sef_local_startup, (void) );
int main(void)
{
int i, r;
message m;
int ipc_status;
/* SEF local startup. */
sef_local_startup();
for(;;)
{
r= driver_receive(ANY, &m, &ipc_status);
if (r < 0)
{
printf("PCI: driver_receive failed: %d\n", r);
break;
}
if (is_ipc_notify(ipc_status)) {
printf("PCI: got notify from %d\n", m.m_source);
/* done, get a new message */
continue;
}
switch(m.m_type)
{
case BUSC_PCI_INIT: do_init(&m); break;
case BUSC_PCI_FIRST_DEV: do_first_dev(&m); break;
case BUSC_PCI_NEXT_DEV: do_next_dev(&m); break;
case BUSC_PCI_FIND_DEV: do_find_dev(&m); break;
case BUSC_PCI_IDS: do_ids(&m); break;
case BUSC_PCI_DEV_NAME: do_dev_name(&m); break;
case BUSC_PCI_RESERVE: do_reserve(&m); break;
case BUSC_PCI_ATTR_R8: do_attr_r8(&m); break;
case BUSC_PCI_ATTR_R16: do_attr_r16(&m); break;
case BUSC_PCI_ATTR_R32: do_attr_r32(&m); break;
case BUSC_PCI_ATTR_W8: do_attr_w8(&m); break;
case BUSC_PCI_ATTR_W16: do_attr_w16(&m); break;
case BUSC_PCI_ATTR_W32: do_attr_w32(&m); break;
case BUSC_PCI_RESCAN: do_rescan_bus(&m); break;
case BUSC_PCI_DEV_NAME_S: do_dev_name_s(&m); break;
case BUSC_PCI_SLOT_NAME_S: do_slot_name_s(&m); break;
case BUSC_PCI_SET_ACL: do_set_acl(&m); break;
case BUSC_PCI_DEL_ACL: do_del_acl(&m); break;
default:
printf("PCI: got message from %d, type %d\n",
m.m_source, m.m_type);
break;
}
}
return 0;
}
/*===========================================================================*
* sef_local_startup *
*===========================================================================*/
PRIVATE void sef_local_startup()
{
/* Register init callbacks. */
sef_setcb_init_fresh(sef_cb_init_fresh);
sef_setcb_init_lu(sef_cb_init_fresh);
sef_setcb_init_restart(sef_cb_init_fresh);
/* Register live update callbacks. */
sef_setcb_lu_prepare(sef_cb_lu_prepare_always_ready);
sef_setcb_lu_state_isvalid(sef_cb_lu_state_isvalid_standard);
/* Let SEF perform startup. */
sef_startup();
}
PRIVATE void do_init(mp)
message *mp;
{
int r;
#if DEBUG
printf("PCI: do_init: called by '%d'\n", mp->m_source);
#endif
mp->m_type= 0;
r= send(mp->m_source, mp);
if (r != 0)
printf("PCI: do_init: unable to send to %d: %d\n",
mp->m_source, r);
}
PRIVATE void do_first_dev(mp)
message *mp;
{
int i, r, devind;
u16_t vid, did;
struct rs_pci *aclp;
aclp= find_acl(mp->m_source);
if (!aclp && debug)
printf("PCI: do_first_dev: no acl for caller %d\n",
mp->m_source);
r= pci_first_dev_a(aclp, &devind, &vid, &did);
if (r == 1)
{
mp->m1_i1= devind;
mp->m1_i2= vid;
mp->m1_i3= did;
}
mp->m_type= r;
r= send(mp->m_source, mp);
if (r != 0)
{
printf("PCI: do_first_dev: unable to send to %d: %d\n",
mp->m_source, r);
}
}
PRIVATE void do_next_dev(mp)
message *mp;
{
int r, devind;
u16_t vid, did;
struct rs_pci *aclp;
devind= mp->m1_i1;
aclp= find_acl(mp->m_source);
r= pci_next_dev_a(aclp, &devind, &vid, &did);
if (r == 1)
{
mp->m1_i1= devind;
mp->m1_i2= vid;
mp->m1_i3= did;
}
mp->m_type= r;
r= send(mp->m_source, mp);
if (r != 0)
{
printf("PCI: do_next_dev: unable to send to %d: %d\n",
mp->m_source, r);
}
}
PRIVATE void do_find_dev(mp)
message *mp;
{
int r, devind;
u8_t bus, dev, func;
bus= mp->m1_i1;
dev= mp->m1_i2;
func= mp->m1_i3;
r= pci_find_dev(bus, dev, func, &devind);
if (r == 1)
mp->m1_i1= devind;
mp->m_type= r;
r= send(mp->m_source, mp);
if (r != 0)
{
printf("PCI: do_find_dev: unable to send to %d: %d\n",
mp->m_source, r);
}
}
PRIVATE void do_ids(mp)
message *mp;
{
int r, devind;
u16_t vid, did;
devind= mp->m1_i1;
r= pci_ids_s(devind, &vid, &did);
if (r != OK)
{
printf("pci:do_ids: failed for devind %d: %d\n",
devind, r);
}
mp->m1_i1= vid;
mp->m1_i2= did;
mp->m_type= r;
r= send(mp->m_source, mp);
if (r != 0)
{
printf("PCI: do_ids: unable to send to %d: %d\n",
mp->m_source, r);
}
}
PRIVATE void do_dev_name(mp)
message *mp;
{
int r, name_len, len;
u16_t vid, did;
char *name_ptr, *name;
vid= mp->m1_i1;
did= mp->m1_i2;
name_len= mp->m1_i3;
name_ptr= mp->m1_p1;
name= pci_dev_name(vid, did);
if (name == NULL)
{
/* No name */
r= ENOENT;
}
else
{
len= strlen(name)+1;
if (len > name_len)
len= name_len;
printf("PCI: pci`do_dev_name: calling do_vircopy\n");
r= sys_vircopy(SELF, D, (vir_bytes)name, mp->m_source, D,
(vir_bytes)name_ptr, len);
}
mp->m_type= r;
r= send(mp->m_source, mp);
if (r != 0)
{
printf("PCI: do_dev_name: unable to send to %d: %d\n",
mp->m_source, r);
}
}
PRIVATE void do_dev_name_s(mp)
message *mp;
{
int r, name_len, len;
u16_t vid, did;
cp_grant_id_t name_gid;
char *name;
vid= mp->m7_i1;
did= mp->m7_i2;
name_len= mp->m7_i3;
name_gid= mp->m7_i4;
name= pci_dev_name(vid, did);
if (name == NULL)
{
/* No name */
r= ENOENT;
}
else
{
len= strlen(name)+1;
if (len > name_len)
len= name_len;
r= sys_safecopyto(mp->m_source, name_gid, 0, (vir_bytes)name,
len, D);
}
mp->m_type= r;
r= send(mp->m_source, mp);
if (r != 0)
{
printf("PCI: do_dev_name: unable to send to %d: %d\n",
mp->m_source, r);
}
}
PRIVATE void do_slot_name_s(mp)
message *mp;
{
int r, devind, name_len, len;
cp_grant_id_t gid;
char *name;
devind= mp->m1_i1;
name_len= mp->m1_i2;
gid= mp->m1_i3;
r= pci_slot_name_s(devind, &name);
if (r != OK)
{
printf("pci:do_slot_name_s: failed for devind %d: %d\n",
devind, r);
}
if (r == OK)
{
len= strlen(name)+1;
if (len > name_len)
len= name_len;
r= sys_safecopyto(mp->m_source, gid, 0,
(vir_bytes)name, len, D);
}
mp->m_type= r;
r= send(mp->m_source, mp);
if (r != 0)
{
printf("PCI: do_slot_name: unable to send to %d: %d\n",
mp->m_source, r);
}
}
PRIVATE void do_set_acl(mp)
message *mp;
{
int i, r, gid;
if (mp->m_source != RS_PROC_NR)
{
printf("PCI: do_set_acl: not from RS\n");
reply(mp, EPERM);
return;
}
for (i= 0; i<NR_DRIVERS; i++)
{
if (!pci_acl[i].inuse)
break;
}
if (i >= NR_DRIVERS)
{
printf("PCI: do_set_acl: table is full\n");
reply(mp, ENOMEM);
return;
}
gid= mp->m1_i1;
r= sys_safecopyfrom(mp->m_source, gid, 0, (vir_bytes)&pci_acl[i].acl,
sizeof(pci_acl[i].acl), D);
if (r != OK)
{
printf("PCI: do_set_acl: safecopyfrom failed\n");
reply(mp, r);
return;
}
pci_acl[i].inuse= 1;
if(debug)
printf("PCI: do_acl: setting ACL for %d ('%s') at entry %d\n",
pci_acl[i].acl.rsp_endpoint, pci_acl[i].acl.rsp_label,
i);
reply(mp, OK);
}
PRIVATE void do_del_acl(mp)
message *mp;
{
int i, r, proc_nr;
if (mp->m_source != RS_PROC_NR)
{
printf("do_del_acl: not from RS\n");
reply(mp, EPERM);
return;
}
proc_nr= mp->m1_i1;
for (i= 0; i<NR_DRIVERS; i++)
{
if (!pci_acl[i].inuse)
continue;
if (pci_acl[i].acl.rsp_endpoint == proc_nr)
break;
}
if (i >= NR_DRIVERS)
{
printf("do_del_acl: nothing found for %d\n", proc_nr);
reply(mp, EINVAL);
return;
}
pci_acl[i].inuse= 0;
#if 0
printf("do_acl: deleting ACL for %d ('%s') at entry %d\n",
pci_acl[i].acl.rsp_endpoint, pci_acl[i].acl.rsp_label, i);
#endif
/* Also release all devices held by this process */
pci_release(proc_nr);
reply(mp, OK);
}
PRIVATE void do_reserve(mp)
message *mp;
{
int i, r, devind;
devind= mp->m1_i1;
mp->m_type= pci_reserve2(devind, mp->m_source);
r= send(mp->m_source, mp);
if (r != 0)
{
printf("do_reserve: unable to send to %d: %d\n",
mp->m_source, r);
}
}
PRIVATE void do_attr_r8(mp)
message *mp;
{
int r, devind, port;
u8_t v;
devind= mp->m2_i1;
port= mp->m2_i2;
r= pci_attr_r8_s(devind, port, &v);
if (r != OK)
{
printf(
"pci:do_attr_r8: pci_attr_r8_s(%d, %d, ...) failed: %d\n",
devind, port, r);
}
mp->m2_l1= v;
mp->m_type= r;
r= send(mp->m_source, mp);
if (r != 0)
{
printf("do_attr_r8: unable to send to %d: %d\n",
mp->m_source, r);
}
}
PRIVATE void do_attr_r16(mp)
message *mp;
{
int r, devind, port;
u32_t v;
devind= mp->m2_i1;
port= mp->m2_i2;
v= pci_attr_r16(devind, port);
mp->m2_l1= v;
mp->m_type= OK;
r= send(mp->m_source, mp);
if (r != 0)
{
printf("do_attr_r16: unable to send to %d: %d\n",
mp->m_source, r);
}
}
PRIVATE void do_attr_r32(mp)
message *mp;
{
int r, devind, port;
u32_t v;
devind= mp->m2_i1;
port= mp->m2_i2;
r= pci_attr_r32_s(devind, port, &v);
if (r != OK)
{
printf(
"pci:do_attr_r32: pci_attr_r32_s(%d, %d, ...) failed: %d\n",
devind, port, r);
}
mp->m2_l1= v;
mp->m_type= OK;
r= send(mp->m_source, mp);
if (r != 0)
{
printf("do_attr_r32: unable to send to %d: %d\n",
mp->m_source, r);
}
}
PRIVATE void do_attr_w8(mp)
message *mp;
{
int r, devind, port;
u8_t v;
devind= mp->m2_i1;
port= mp->m2_i2;
v= mp->m2_l1;
pci_attr_w8(devind, port, v);
mp->m_type= OK;
r= send(mp->m_source, mp);
if (r != 0)
{
printf("do_attr_w8: unable to send to %d: %d\n",
mp->m_source, r);
}
}
PRIVATE void do_attr_w16(mp)
message *mp;
{
int r, devind, port;
u16_t v;
devind= mp->m2_i1;
port= mp->m2_i2;
v= mp->m2_l1;
pci_attr_w16(devind, port, v);
mp->m_type= OK;
r= send(mp->m_source, mp);
if (r != 0)
{
printf("do_attr_w16: unable to send to %d: %d\n",
mp->m_source, r);
}
}
PRIVATE void do_attr_w32(mp)
message *mp;
{
int r, devind, port;
u32_t v;
devind= mp->m2_i1;
port= mp->m2_i2;
v= mp->m2_l1;
pci_attr_w32(devind, port, v);
mp->m_type= OK;
r= send(mp->m_source, mp);
if (r != 0)
{
printf("do_attr_w32: unable to send to %d: %d\n",
mp->m_source, r);
}
}
PRIVATE void do_rescan_bus(mp)
message *mp;
{
int r, busnr;
busnr= mp->m2_i1;
pci_rescan_bus(busnr);
mp->m_type= OK;
r= send(mp->m_source, mp);
if (r != 0)
{
printf("do_rescan_bus: unable to send to %d: %d\n",
mp->m_source, r);
}
}
PRIVATE void reply(mp, result)
message *mp;
int result;
{
int r;
message m;
m.m_type= result;
r= send(mp->m_source, &m);
if (r != 0)
printf("reply: unable to send to %d: %d\n", mp->m_source, r);
}
PRIVATE struct rs_pci *find_acl(endpoint)
int endpoint;
{
int i;
/* Find ACL entry for caller */
for (i= 0; i<NR_DRIVERS; i++)
{
if (!pci_acl[i].inuse)
continue;
if (pci_acl[i].acl.rsp_endpoint == endpoint)
return &pci_acl[i].acl;
}
return NULL;
}
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