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minix/drivers/pci/main.c
Cristiano Giuffrida cb176df60f New RS and new signal handling for system processes. 
UPDATING INFO:
20100317:
        /usr/src/etc/system.conf updated to ignore default kernel calls: copy
        it (or merge it) to /etc/system.conf.
        The hello driver (/dev/hello) added to the distribution:
        # cd /usr/src/commands/scripts && make clean install
        # cd /dev && MAKEDEV hello

KERNEL CHANGES:
- Generic signal handling support. The kernel no longer assumes PM as a signal
manager for every process. The signal manager of a given process can now be
specified in its privilege slot. When a signal has to be delivered, the kernel
performs the lookup and forwards the signal to the appropriate signal manager.
PM is the default signal manager for user processes, RS is the default signal
manager for system processes. To enable ptrace()ing for system processes, it
is sufficient to change the default signal manager to PM. This will temporarily
disable crash recovery, though.
- sys_exit() is now split into sys_exit() (i.e. exit() for system processes,
which generates a self-termination signal), and sys_clear() (i.e. used by PM
to ask the kernel to clear a process slot when a process exits).
- Added a new kernel call (i.e. sys_update()) to swap two process slots and
implement live update.

PM CHANGES:
- Posix signal handling is no longer allowed for system processes. System
signals are split into two fixed categories: termination and non-termination
signals. When a non-termination signaled is processed, PM transforms the signal
into an IPC message and delivers the message to the system process. When a
termination signal is processed, PM terminates the process.
- PM no longer assumes itself as the signal manager for system processes. It now
makes sure that every system signal goes through the kernel before being
actually processes. The kernel will then dispatch the signal to the appropriate
signal manager which may or may not be PM.

SYSLIB CHANGES:
- Simplified SEF init and LU callbacks.
- Added additional predefined SEF callbacks to debug crash recovery and
live update.
- Fixed a temporary ack in the SEF init protocol. SEF init reply is now
completely synchronous.
- Added SEF signal event type to provide a uniform interface for system
processes to deal with signals. A sef_cb_signal_handler() callback is
available for system processes to handle every received signal. A
sef_cb_signal_manager() callback is used by signal managers to process
system signals on behalf of the kernel.
- Fixed a few bugs with memory mapping and DS.

VM CHANGES:
- Page faults and memory requests coming from the kernel are now implemented
using signals.
- Added a new VM call to swap two process slots and implement live update.
- The call is used by RS at update time and in turn invokes the kernel call
sys_update().

RS CHANGES:
- RS has been reworked with a better functional decomposition.
- Better kernel call masks. com.h now defines the set of very basic kernel calls
every system service is allowed to use. This makes system.conf simpler and
easier to maintain. In addition, this guarantees a higher level of isolation
for system libraries that use one or more kernel calls internally (e.g. printf).
- RS is the default signal manager for system processes. By default, RS
intercepts every signal delivered to every system process. This makes crash
recovery possible before bringing PM and friends in the loop.
- RS now supports fast rollback when something goes wrong while initializing
the new version during a live update.
- Live update is now implemented by keeping the two versions side-by-side and
swapping the process slots when the old version is ready to update.
- Crash recovery is now implemented by keeping the two versions side-by-side
and cleaning up the old version only when the recovery process is complete.

DS CHANGES:
- Fixed a bug when the process doing ds_publish() or ds_delete() is not known
by DS.
- Fixed the completely broken support for strings. String publishing is now
implemented in the system library and simply wraps publishing of memory ranges.
Ideally, we should adopt a similar approach for other data types as well.
- Test suite fixed.

DRIVER CHANGES:
- The hello driver has been added to the Minix distribution to demonstrate basic
live update and crash recovery functionalities.
- Other drivers have been adapted to conform the new SEF interface.
2010-03-17 01:15:29 +00:00

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/*
main.c
*/
#include "../drivers.h"
#include <minix/rs.h>
#include <minix/endpoint.h>
#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;
/* SEF local startup. */
sef_local_startup();
for(;;)
{
r= sef_receive(ANY, &m);
if (r < 0)
{
printf("PCI: sef_receive from ANY failed: %d\n", r);
break;
}
if (is_notify(m.m_type)) {
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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