Skip to content

Commit

Permalink
drm/radeon/kms: catch atombios infinite loop and break out of it
Browse files Browse the repository at this point in the history 
In somecase the atombios code might lead to infinite loop because
the GPU is in broken state, this patch track the jump history and
will abort atombios execution if we are stuck executing the same
jump for more than 1sec. Note that otherwise in some case we might
enter an infinite loop in the kernel context which is bad.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
  • Loading branch information
Jerome Glisse authored and Dave Airlie committed Mar 14, 2010
1 parent 338e2b1 commit c21b0fe
Show file tree
Hide file tree
Showing 2 changed files with 48 additions and 13 deletions.
59 changes: 47 additions & 12 deletions drivers/gpu/drm/radeon/atom.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -52,15 +52,17 @@

typedef struct {
struct atom_context *ctx;

uint32_t *ps, *ws;
int ps_shift;
uint16_t start;
unsigned last_jump;
unsigned long last_jump_jiffies;
bool abort;
} atom_exec_context;

int atom_debug = 0;
static void atom_execute_table_locked(struct atom_context *ctx, int index, uint32_t * params);
void atom_execute_table(struct atom_context *ctx, int index, uint32_t * params);
static int atom_execute_table_locked(struct atom_context *ctx, int index, uint32_t * params);
int atom_execute_table(struct atom_context *ctx, int index, uint32_t * params);

static uint32_t atom_arg_mask[8] =
{ 0xFFFFFFFF, 0xFFFF, 0xFFFF00, 0xFFFF0000, 0xFF, 0xFF00, 0xFF0000,
Expand Down Expand Up @@ -604,12 +606,17 @@ static void atom_op_beep(atom_exec_context *ctx, int *ptr, int arg)
static void atom_op_calltable(atom_exec_context *ctx, int *ptr, int arg)
{
int idx = U8((*ptr)++);
int r = 0;

if (idx < ATOM_TABLE_NAMES_CNT)
SDEBUG(" table: %d (%s)\n", idx, atom_table_names[idx]);
else
SDEBUG(" table: %d\n", idx);
if (U16(ctx->ctx->cmd_table + 4 + 2 * idx))
atom_execute_table_locked(ctx->ctx, idx, ctx->ps + ctx->ps_shift);
r = atom_execute_table_locked(ctx->ctx, idx, ctx->ps + ctx->ps_shift);
if (r) {
ctx->abort = true;
}
}

static void atom_op_clear(atom_exec_context *ctx, int *ptr, int arg)
Expand Down Expand Up @@ -673,6 +680,8 @@ static void atom_op_eot(atom_exec_context *ctx, int *ptr, int arg)
static void atom_op_jump(atom_exec_context *ctx, int *ptr, int arg)
{
int execute = 0, target = U16(*ptr);
unsigned long cjiffies;

(*ptr) += 2;
switch (arg) {
case ATOM_COND_ABOVE:
Expand Down Expand Up @@ -700,8 +709,25 @@ static void atom_op_jump(atom_exec_context *ctx, int *ptr, int arg)
if (arg != ATOM_COND_ALWAYS)
SDEBUG(" taken: %s\n", execute ? "yes" : "no");
SDEBUG(" target: 0x%04X\n", target);
if (execute)
if (execute) {
if (ctx->last_jump == (ctx->start + target)) {
cjiffies = jiffies;
if (time_after(cjiffies, ctx->last_jump_jiffies)) {
cjiffies -= ctx->last_jump_jiffies;
if ((jiffies_to_msecs(cjiffies) > 1000)) {
DRM_ERROR("atombios stuck in loop for more than 1sec aborting\n");
ctx->abort = true;
}
} else {
/* jiffies wrap around we will just wait a little longer */
ctx->last_jump_jiffies = jiffies;
}
} else {
ctx->last_jump = ctx->start + target;
ctx->last_jump_jiffies = jiffies;
}
*ptr = ctx->start + target;
}
}

static void atom_op_mask(atom_exec_context *ctx, int *ptr, int arg)
Expand Down Expand Up @@ -1104,15 +1130,15 @@ static struct {
atom_op_shr, ATOM_ARG_MC}, {
atom_op_debug, 0},};

static void atom_execute_table_locked(struct atom_context *ctx, int index, uint32_t * params)
static int atom_execute_table_locked(struct atom_context *ctx, int index, uint32_t * params)
{
int base = CU16(ctx->cmd_table + 4 + 2 * index);
int len, ws, ps, ptr;
unsigned char op;
atom_exec_context ectx;

if (!base)
return;
return -EINVAL;

len = CU16(base + ATOM_CT_SIZE_PTR);
ws = CU8(base + ATOM_CT_WS_PTR);
Expand All @@ -1125,6 +1151,8 @@ static void atom_execute_table_locked(struct atom_context *ctx, int index, uint3
ectx.ps_shift = ps / 4;
ectx.start = base;
ectx.ps = params;
ectx.abort = false;
ectx.last_jump = 0;
if (ws)
ectx.ws = kzalloc(4 * ws, GFP_KERNEL);
else
Expand All @@ -1137,6 +1165,11 @@ static void atom_execute_table_locked(struct atom_context *ctx, int index, uint3
SDEBUG("%s @ 0x%04X\n", atom_op_names[op], ptr - 1);
else
SDEBUG("[%d] @ 0x%04X\n", op, ptr - 1);
if (ectx.abort) {
DRM_ERROR("atombios stuck executing %04X (len %d, WS %d, PS %d) @ 0x%04X\n",
base, len, ws, ps, ptr - 1);
return -EINVAL;
}

if (op < ATOM_OP_CNT && op > 0)
opcode_table[op].func(&ectx, &ptr,
Expand All @@ -1152,19 +1185,23 @@ static void atom_execute_table_locked(struct atom_context *ctx, int index, uint3

if (ws)
kfree(ectx.ws);
return 0;
}

void atom_execute_table(struct atom_context *ctx, int index, uint32_t * params)
int atom_execute_table(struct atom_context *ctx, int index, uint32_t * params)
{
int r;

mutex_lock(&ctx->mutex);
/* reset reg block */
ctx->reg_block = 0;
/* reset fb window */
ctx->fb_base = 0;
/* reset io mode */
ctx->io_mode = ATOM_IO_MM;
atom_execute_table_locked(ctx, index, params);
r = atom_execute_table_locked(ctx, index, params);
mutex_unlock(&ctx->mutex);
return r;
}

static int atom_iio_len[] = { 1, 2, 3, 3, 3, 3, 4, 4, 4, 3 };
Expand Down Expand Up @@ -1248,9 +1285,7 @@ int atom_asic_init(struct atom_context *ctx)

if (!CU16(ctx->cmd_table + 4 + 2 * ATOM_CMD_INIT))
return 1;
atom_execute_table(ctx, ATOM_CMD_INIT, ps);

return 0;
return atom_execute_table(ctx, ATOM_CMD_INIT, ps);
}

void atom_destroy(struct atom_context *ctx)
Expand Down
2 changes: 1 addition & 1 deletion drivers/gpu/drm/radeon/atom.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -140,7 +140,7 @@ struct atom_context {
extern int atom_debug;

struct atom_context *atom_parse(struct card_info *, void *);
void atom_execute_table(struct atom_context *, int, uint32_t *);
int atom_execute_table(struct atom_context *, int, uint32_t *);
int atom_asic_init(struct atom_context *);
void atom_destroy(struct atom_context *);
void atom_parse_data_header(struct atom_context *ctx, int index, uint16_t *size, uint8_t *frev, uint8_t *crev, uint16_t *data_start);
Expand Down

0 comments on commit c21b0fe

Please sign in to comment.