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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2015-2018 Etnaviv Project
*/
#include <linux/kernel.h>
#include "etnaviv_gem.h"
#include "etnaviv_gpu.h"
#include "cmdstream.xml.h"
#define EXTRACT(val, field) (((val) & field##__MASK) >> field##__SHIFT)
struct etna_validation_state {
struct etnaviv_gpu *gpu;
const struct drm_etnaviv_gem_submit_reloc *relocs;
unsigned int num_relocs;
u32 *start;
};
static const struct {
u16 offset;
u16 size;
} etnaviv_sensitive_states[] __initconst = {
#define ST(start, num) { (start) >> 2, (num) }
/* 2D */
ST(0x1200, 1),
ST(0x1228, 1),
ST(0x1238, 1),
ST(0x1284, 1),
ST(0x128c, 1),
ST(0x1304, 1),
ST(0x1310, 1),
ST(0x1318, 1),
ST(0x12800, 4),
ST(0x128a0, 4),
ST(0x128c0, 4),
ST(0x12970, 4),
ST(0x12a00, 8),
ST(0x12b40, 8),
ST(0x12b80, 8),
ST(0x12ce0, 8),
/* 3D */
ST(0x0644, 1),
ST(0x064c, 1),
ST(0x0680, 8),
ST(0x086c, 1),
ST(0x1028, 1),
ST(0x1410, 1),
ST(0x1430, 1),
ST(0x1458, 1),
ST(0x1460, 8),
ST(0x1480, 8),
ST(0x1500, 8),
ST(0x1520, 8),
ST(0x1608, 1),
ST(0x1610, 1),
ST(0x1658, 1),
ST(0x165c, 1),
ST(0x1664, 1),
ST(0x1668, 1),
ST(0x16a4, 1),
ST(0x16c0, 8),
ST(0x16e0, 8),
ST(0x1740, 8),
ST(0x17c0, 8),
ST(0x17e0, 8),
ST(0x2400, 14 * 16),
ST(0x3824, 1),
ST(0x10800, 32 * 16),
ST(0x14600, 16),
ST(0x14800, 8 * 8),
#undef ST
};
#define ETNAVIV_STATES_SIZE (VIV_FE_LOAD_STATE_HEADER_OFFSET__MASK + 1u)
static DECLARE_BITMAP(etnaviv_states, ETNAVIV_STATES_SIZE);
void __init etnaviv_validate_init(void)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(etnaviv_sensitive_states); i++)
bitmap_set(etnaviv_states, etnaviv_sensitive_states[i].offset,
etnaviv_sensitive_states[i].size);
}
static void etnaviv_warn_if_non_sensitive(struct etna_validation_state *state,
unsigned int buf_offset, unsigned int state_addr)
{
if (state->num_relocs && state->relocs->submit_offset < buf_offset) {
dev_warn_once(state->gpu->dev,
"%s: relocation for non-sensitive state 0x%x at offset %u\n",
__func__, state_addr,
state->relocs->submit_offset);
while (state->num_relocs &&
state->relocs->submit_offset < buf_offset) {
state->relocs++;
state->num_relocs--;
}
}
}
static bool etnaviv_validate_load_state(struct etna_validation_state *state,
u32 *ptr, unsigned int state_offset, unsigned int num)
{
unsigned int size = min(ETNAVIV_STATES_SIZE, state_offset + num);
unsigned int st_offset = state_offset, buf_offset;
for_each_set_bit_from(st_offset, etnaviv_states, size) {
buf_offset = (ptr - state->start +
st_offset - state_offset) * 4;
etnaviv_warn_if_non_sensitive(state, buf_offset, st_offset * 4);
if (state->num_relocs &&
state->relocs->submit_offset == buf_offset) {
state->relocs++;
state->num_relocs--;
continue;
}
dev_warn_ratelimited(state->gpu->dev,
"%s: load state touches restricted state 0x%x at offset %u\n",
__func__, st_offset * 4, buf_offset);
return false;
}
if (state->num_relocs) {
buf_offset = (ptr - state->start + num) * 4;
etnaviv_warn_if_non_sensitive(state, buf_offset, st_offset * 4 +
state->relocs->submit_offset -
buf_offset);
}
return true;
}
static uint8_t cmd_length[32] = {
[FE_OPCODE_DRAW_PRIMITIVES] = 4,
[FE_OPCODE_DRAW_INDEXED_PRIMITIVES] = 6,
[FE_OPCODE_DRAW_INSTANCED] = 4,
[FE_OPCODE_NOP] = 2,
[FE_OPCODE_STALL] = 2,
};
bool etnaviv_cmd_validate_one(struct etnaviv_gpu *gpu, u32 *stream,
unsigned int size,
struct drm_etnaviv_gem_submit_reloc *relocs,
unsigned int reloc_size)
{
struct etna_validation_state state;
u32 *buf = stream;
u32 *end = buf + size;
state.gpu = gpu;
state.relocs = relocs;
state.num_relocs = reloc_size;
state.start = stream;
while (buf < end) {
u32 cmd = *buf;
unsigned int len, n, off;
unsigned int op = cmd >> 27;
switch (op) {
case FE_OPCODE_LOAD_STATE:
n = EXTRACT(cmd, VIV_FE_LOAD_STATE_HEADER_COUNT);
len = ALIGN(1 + n, 2);
if (buf + len > end)
break;
off = EXTRACT(cmd, VIV_FE_LOAD_STATE_HEADER_OFFSET);
if (!etnaviv_validate_load_state(&state, buf + 1,
off, n))
return false;
break;
case FE_OPCODE_DRAW_2D:
n = EXTRACT(cmd, VIV_FE_DRAW_2D_HEADER_COUNT);
if (n == 0)
n = 256;
len = 2 + n * 2;
break;
default:
len = cmd_length[op];
if (len == 0) {
dev_err(gpu->dev, "%s: op %u not permitted at offset %tu\n",
__func__, op, buf - state.start);
return false;
}
break;
}
buf += len;
}
if (buf > end) {
dev_err(gpu->dev, "%s: commands overflow end of buffer: %tu > %u\n",
__func__, buf - state.start, size);
return false;
}
return true;
}
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