minix/drivers/amddev/amddev.c
2012-03-25 21:58:14 +02:00

470 lines
10 KiB
C

/*
amddev.c
Driver for the AMD Device Exclusion Vector (DEV)
*/
#include <minix/driver.h>
#include <minix/config.h>
#include <minix/type.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <machine/vm.h>
#include <signal.h>
#include <minix/com.h>
#include <minix/const.h>
#include <minix/ipc.h>
#include <minix/syslib.h>
#include <minix/sysutil.h>
#include <minix/endpoint.h>
#include <machine/pci.h>
/* Offsets from capability pointer */
#define DEV_OP 4 /* Selects control/status register to access */
#define DEV_OP_FUNC_SHIFT 8 /* Function part in OP reg. */
#define DEV_DATA 8 /* Read/write to access reg. selected */
/* Functions */
#define DEVF_BASE_LO 0
#define DEVF_BASE_HI 1
#define DEVF_MAP 2
#define DEVF_CAP 3
#define DEVF_CAP_MAPS_MASK 0x00ff0000
#define DEVF_CAP_MAPS_SHIFT 16
#define DEVF_CAP_DOMS_MASK 0x0000ff00
#define DEVF_CAP_DOMS_SHIFT 8
#define DEVF_CAP_REV_MASK 0x000000ff
#define DEVF_CAP_REV_SHIFT 0
#define DEVF_CR 4
#define DEVF_ERR_STATUS 5
#define DEVF_ERR_ADDR_LO 6
#define DEVF_ERR_ADDR_HI 7
static int dev_devind;
static u8_t dev_capptr;
static u8_t *table;
static int find_dev(int *devindp, u8_t *capaddrp);
static u32_t read_reg(int function, int index);
static void write_reg(int function, int index, u32_t value);
static void init_domain(int index);
static void init_map(unsigned int ix);
static int do_add4pci(const message *m);
static void add_range(phys_bytes busaddr, phys_bytes size);
static void del_range(phys_bytes busaddr, phys_bytes size);
static void report_exceptions(void);
/* SEF functions and variables. */
static void sef_local_startup(void);
static int sef_cb_init_fresh(int type, sef_init_info_t *info);
static void sef_cb_signal_handler(int signo);
int main(void)
{
int r;
message m;
int ipc_status;
/* SEF local startup. */
sef_local_startup();
for(;;)
{
report_exceptions();
r= driver_receive(ANY, &m, &ipc_status);
if (r != OK)
panic("driver_receive failed: %d", r);
if (m.m_type == IOMMU_MAP) {
r= do_add4pci(&m);
m.m_type= r;
send(m.m_source, &m);
continue;
}
printf("amddev: got message from %d\n", m.m_source);
}
}
/*===========================================================================*
* sef_local_startup *
*===========================================================================*/
static 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);
/* Register signal callbacks. */
sef_setcb_signal_handler(sef_cb_signal_handler);
/* Let SEF perform startup. */
sef_startup();
}
/*===========================================================================*
* sef_cb_init_fresh *
*===========================================================================*/
static int sef_cb_init_fresh(int UNUSED(type), sef_init_info_t *UNUSED(info))
{
/* Initialize the amddev driver. */
int r, n_maps, n_domains, revision;
u16_t flags;
u32_t bits;
printf("amddev: starting\n");
r= find_dev(&dev_devind, &dev_capptr);
if (!r)
return r;
flags= pci_attr_r16(dev_devind, dev_capptr+CAP_SD_INFO);
printf("amddev`init: flags = 0x%x\n", flags);
bits= read_reg(DEVF_CAP, 0);
n_maps= ((bits & DEVF_CAP_MAPS_MASK) >> DEVF_CAP_MAPS_SHIFT);
n_domains= ((bits & DEVF_CAP_DOMS_MASK) >> DEVF_CAP_DOMS_SHIFT);
revision= ((bits & DEVF_CAP_REV_MASK) >> DEVF_CAP_REV_SHIFT);
printf("amddev`init: DEVF_CAP = 0x%x (%d maps, %d domains, rev 0x%x)\n",
bits, n_maps, n_domains, revision);
printf("status = 0x%x, addr-lo = 0x%x, addr-hi = 0x%x\n",
read_reg(DEVF_ERR_STATUS, 0),
read_reg(DEVF_ERR_ADDR_LO, 0),
read_reg(DEVF_ERR_ADDR_HI, 0));
init_domain(0);
init_map(0);
#if 0
init_domain(1);
#endif
write_reg(DEVF_CR, 0, 0x10 | 0x8 | 0x4 | 1);
printf("after write: DEVF_CR: 0x%x\n", read_reg(DEVF_CR, 0));
return(OK);
}
/*===========================================================================*
* sef_cb_signal_handler *
*===========================================================================*/
static void sef_cb_signal_handler(int signo)
{
int r;
endpoint_t proc_e;
phys_bytes base, size;
/* Only check for termination signal, ignore anything else. */
if (signo != SIGTERM) return;
for (;;)
{
r= vm_getdma(&proc_e, &base, &size);
if (r == -1)
{
if (errno != -EAGAIN)
{
printf(
"amddev: vm_getdma failed: %d\n",
errno);
}
break;
}
printf(
"amddev: deleting 0x%lx@0x%lx for proc %d\n",
size, base, proc_e);
del_range(base, size);
r= vm_deldma(proc_e, base, size);
if (r == -1)
{
printf("amddev: vm_deldma failed: %d\n",
errno);
break;
}
}
}
/* Returns 0 if no device found, or 1 if a device is found. */
static int find_dev(devindp, capaddrp)
int *devindp;
u8_t *capaddrp;
{
int r, devind, first;
u8_t capptr, type, next, subtype;
u16_t vid, did, status;
pci_init();
first= 1;
for(;;)
{
if (first)
{
first= 0;
r= pci_first_dev(&devind, &vid, &did);
if (!r)
{
printf("amddev`find_dev: no first dev\n");
return 0;
}
}
else
{
r= pci_next_dev(&devind, &vid, &did);
if (!r)
{
printf("amddev`find_dev: no next dev\n");
return 0;
}
}
printf("amddev`find_dev: got devind %d, vid 0x%x, did 0x%x\n",
devind, vid, did);
/* Check capabilities bit in the device status register */
status= pci_attr_r16(devind, PCI_SR);
if (!(status & PSR_CAPPTR))
continue;
capptr= (pci_attr_r8(devind, PCI_CAPPTR) & PCI_CP_MASK);
while (capptr != 0)
{
type = pci_attr_r8(devind, capptr+CAP_TYPE);
next= (pci_attr_r8(devind, capptr+CAP_NEXT) &
PCI_CP_MASK);
if (type == CAP_T_SECURE_DEV)
{
printf(
"amddev`find_dev: found secure device\n");
subtype= (pci_attr_r8(devind, capptr+
CAP_SD_INFO) & CAP_SD_SUBTYPE_MASK);
if (subtype == CAP_T_SD_DEV)
{
printf("amddev`find_dev: AMD DEV\n");
pci_reserve(devind);
*devindp= devind;
*capaddrp= capptr;
return 1;
}
}
capptr= next;
}
}
return 0;
}
static u32_t read_reg(int function, int index)
{
pci_attr_w32(dev_devind, dev_capptr + DEV_OP, ((function <<
DEV_OP_FUNC_SHIFT) | index));
return pci_attr_r32(dev_devind, dev_capptr + DEV_DATA);
}
static void write_reg(int function, int index, u32_t value)
{
pci_attr_w32(dev_devind, dev_capptr + DEV_OP, ((function <<
DEV_OP_FUNC_SHIFT) | index));
pci_attr_w32(dev_devind, dev_capptr + DEV_DATA, value);
}
static void init_domain(int index)
{
size_t size, memsize;
phys_bytes busaddr;
size= 0x100000 / 8;
table= alloc_contig(size, AC_ALIGN4K, &busaddr);
if (table == NULL)
panic("malloc failed");
if (index == 0)
{
memset(table, 0, size);
memsize= 0x37000 / 8;
printf("memsize = 0x%x / 8\n", memsize*8);
memset(table, 0xff, memsize);
}
else
{
memset(table, 0xff, size);
memset(table, 0x00, size);
}
printf("init_domain: busaddr = 0x%lx\n", busaddr);
write_reg(DEVF_BASE_HI, index, 0);
write_reg(DEVF_BASE_LO, index, busaddr | 3);
printf("after write: DEVF_BASE_LO: 0x%x\n",
read_reg(DEVF_BASE_LO, index));
}
static void init_map(unsigned int ix)
{
u32_t v, dom, busno, unit0, unit1;
dom= 1;
busno= 7;
unit1= 9;
unit0= 9;
v= (dom << 26) | (dom << 20) | (busno << 12) |
(0 << 11) | (unit1 << 6) |
(0 << 5) | (unit0 << 0);
write_reg(DEVF_MAP, ix, v);
printf("after write: DEVF_MAP: 0x%x\n", read_reg(DEVF_MAP, ix));
}
#if 0
static int do_add(message *m)
{
int r;
endpoint_t proc;
vir_bytes start;
size_t size;
phys_bytes busaddr;
proc= m->m_source;
start= m->m2_l1;
size= m->m2_l2;
#if 0
printf("amddev`do_add: got request for 0x%x@0x%x from %d\n",
size, start, proc);
#endif
if (start % I386_PAGE_SIZE)
{
printf("amddev`do_add: bad start 0x%x from proc %d\n",
start, proc);
return EINVAL;
}
if (size % I386_PAGE_SIZE)
{
printf("amddev`do_add: bad size 0x%x from proc %d\n",
size, proc);
return EINVAL;
}
r= sys_umap_remote(proc, SELF, VM_D, (vir_bytes)start, size, &busaddr);
if (r != OK)
{
printf("amddev`do_add: umap failed for 0x%x@0x%x, proc %d\n",
size, start, proc);
return r;
}
add_range(busaddr, size);
}
#endif
static int do_add4pci(const message *m)
{
int r, pci_bus, pci_dev, pci_func;
endpoint_t proc;
vir_bytes start;
size_t size;
phys_bytes busaddr;
proc= m->m_source;
start= m->m2_l1;
size= m->m2_l2;
pci_bus= m->m1_i1;
pci_dev= m->m1_i2;
pci_func= m->m1_i3;
printf(
"amddev`do_add4pci: got request for 0x%x@0x%lx from %d for pci dev %u.%u.%u\n",
size, start, proc, pci_bus, pci_dev, pci_func);
if (start % I386_PAGE_SIZE)
{
printf("amddev`do_add4pci: bad start 0x%lx from proc %d\n",
start, proc);
return EINVAL;
}
if (size % I386_PAGE_SIZE)
{
printf("amddev`do_add4pci: bad size 0x%x from proc %d\n",
size, proc);
return EINVAL;
}
printf("amddev`do_add4pci: should check with PCI\n");
r= sys_umap_remote(proc, SELF, VM_D, (vir_bytes)start, size, &busaddr);
if (r != OK)
{
printf(
"amddev`do_add4pci: umap failed for 0x%x@0x%lx, proc %d: %d\n",
size, start, proc, r);
return r;
}
r= vm_adddma(proc, start, size);
if (r != 0)
{
r= -errno;
printf("amddev`do_add4pci: vm_adddma failed for 0x%x@0x%lx, "
"proc %d: %d\n", size, start, proc, r);
return r;
}
add_range(busaddr, size);
return OK;
}
static void add_range(phys_bytes busaddr, phys_bytes size)
{
phys_bytes o;
#if 0
printf("add_range: mapping 0x%x@0x%x\n", size, busaddr);
#endif
for (o= 0; o<size; o += I386_PAGE_SIZE)
{
u32_t bit= (busaddr+o)/I386_PAGE_SIZE;
table[bit/8] &= ~(1U << (bit % 8));
}
}
static void del_range(phys_bytes busaddr, phys_bytes size)
{
phys_bytes o;
#if 0
printf("del_range: mapping 0x%x@0x%x\n", size, busaddr);
#endif
for (o= 0; o<size; o += I386_PAGE_SIZE)
{
u32_t bit= (busaddr+o)/I386_PAGE_SIZE;
table[bit/8] |= (1 << (bit % 8));
}
}
static void report_exceptions(void)
{
u32_t status;
status= read_reg(DEVF_ERR_STATUS, 0);
if (!(status & 0x80000000))
return;
printf("amddev: status = 0x%x, addr-lo = 0x%x, addr-hi = 0x%x\n",
status, read_reg(DEVF_ERR_ADDR_LO, 0),
read_reg(DEVF_ERR_ADDR_HI, 0));
write_reg(DEVF_ERR_STATUS, 0, 0);
}