1/*
  2 * Copyright (C) 2015 Etnaviv Project
  3 *
  4 * This program is free software; you can redistribute it and/or modify it
  5 * under the terms of the GNU General Public License version 2 as published by
  6 * the Free Software Foundation.
  7 *
  8 * This program is distributed in the hope that it will be useful, but WITHOUT
  9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 10 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 11 * more details.
 12 *
 13 * You should have received a copy of the GNU General Public License along with
 14 * this program.  If not, see <http://www.gnu.org/licenses/>.
 15 */
 16
 17#include <linux/kernel.h>
 18
 19#include "etnaviv_gem.h"
 20#include "etnaviv_gpu.h"
 21
 22#include "cmdstream.xml.h"
 23
 24#define EXTRACT(val, field) (((val) & field##__MASK) >> field##__SHIFT)
 25
 26struct etna_validation_state {
 27	struct etnaviv_gpu *gpu;
 28	const struct drm_etnaviv_gem_submit_reloc *relocs;
 29	unsigned int num_relocs;
 30	u32 *start;
 31};
 32
 33static const struct {
 34	u16 offset;
 35	u16 size;
 36} etnaviv_sensitive_states[] __initconst = {
 37#define ST(start, num) { (start) >> 2, (num) }
 38	/* 2D */
 39	ST(0x1200, 1),
 40	ST(0x1228, 1),
 41	ST(0x1238, 1),
 42	ST(0x1284, 1),
 43	ST(0x128c, 1),
 44	ST(0x1304, 1),
 45	ST(0x1310, 1),
 46	ST(0x1318, 1),
 47	ST(0x12800, 4),
 48	ST(0x128a0, 4),
 49	ST(0x128c0, 4),
 50	ST(0x12970, 4),
 51	ST(0x12a00, 8),
 52	ST(0x12b40, 8),
 53	ST(0x12b80, 8),
 54	ST(0x12ce0, 8),
 55	/* 3D */
 56	ST(0x0644, 1),
 57	ST(0x064c, 1),
 58	ST(0x0680, 8),
 59	ST(0x086c, 1),
 60	ST(0x1028, 1),
 61	ST(0x1410, 1),
 62	ST(0x1430, 1),
 63	ST(0x1458, 1),
 64	ST(0x1460, 8),
 65	ST(0x1480, 8),
 66	ST(0x1500, 8),
 67	ST(0x1520, 8),
 68	ST(0x1608, 1),
 69	ST(0x1610, 1),
 70	ST(0x1658, 1),
 71	ST(0x165c, 1),
 72	ST(0x1664, 1),
 73	ST(0x1668, 1),
 74	ST(0x16a4, 1),
 75	ST(0x16c0, 8),
 76	ST(0x16e0, 8),
 77	ST(0x1740, 8),
 78	ST(0x17c0, 8),
 79	ST(0x17e0, 8),
 80	ST(0x2400, 14 * 16),
 81	ST(0x3824, 1),
 82	ST(0x10800, 32 * 16),
 83	ST(0x14600, 16),
 84	ST(0x14800, 8 * 8),
 85#undef ST
 86};
 87
 88#define ETNAVIV_STATES_SIZE (VIV_FE_LOAD_STATE_HEADER_OFFSET__MASK + 1u)
 89static DECLARE_BITMAP(etnaviv_states, ETNAVIV_STATES_SIZE);
 90
 91void __init etnaviv_validate_init(void)
 92{
 93	unsigned int i;
 94
 95	for (i = 0; i < ARRAY_SIZE(etnaviv_sensitive_states); i++)
 96		bitmap_set(etnaviv_states, etnaviv_sensitive_states[i].offset,
 97			   etnaviv_sensitive_states[i].size);
 98}
 99
100static void etnaviv_warn_if_non_sensitive(struct etna_validation_state *state,
101	unsigned int buf_offset, unsigned int state_addr)
102{
103	if (state->num_relocs && state->relocs->submit_offset < buf_offset) {
104		dev_warn_once(state->gpu->dev,
105			      "%s: relocation for non-sensitive state 0x%x at offset %u\n",
106			      __func__, state_addr,
107			      state->relocs->submit_offset);
108		while (state->num_relocs &&
109		       state->relocs->submit_offset < buf_offset) {
110			state->relocs++;
111			state->num_relocs--;
112		}
113	}
114}
115
116static bool etnaviv_validate_load_state(struct etna_validation_state *state,
117	u32 *ptr, unsigned int state_offset, unsigned int num)
118{
119	unsigned int size = min(ETNAVIV_STATES_SIZE, state_offset + num);
120	unsigned int st_offset = state_offset, buf_offset;
121
122	for_each_set_bit_from(st_offset, etnaviv_states, size) {
123		buf_offset = (ptr - state->start +
124			      st_offset - state_offset) * 4;
125
126		etnaviv_warn_if_non_sensitive(state, buf_offset, st_offset * 4);
127		if (state->num_relocs &&
128		    state->relocs->submit_offset == buf_offset) {
129			state->relocs++;
130			state->num_relocs--;
131			continue;
132		}
133
134		dev_warn_ratelimited(state->gpu->dev,
135				     "%s: load state touches restricted state 0x%x at offset %u\n",
136				     __func__, st_offset * 4, buf_offset);
137		return false;
138	}
139
140	if (state->num_relocs) {
141		buf_offset = (ptr - state->start + num) * 4;
142		etnaviv_warn_if_non_sensitive(state, buf_offset, st_offset * 4 +
143					      state->relocs->submit_offset -
144					      buf_offset);
145	}
146
147	return true;
148}
149
150static uint8_t cmd_length[32] = {
151	[FE_OPCODE_DRAW_PRIMITIVES] = 4,
152	[FE_OPCODE_DRAW_INDEXED_PRIMITIVES] = 6,
153	[FE_OPCODE_DRAW_INSTANCED] = 4,
154	[FE_OPCODE_NOP] = 2,
155	[FE_OPCODE_STALL] = 2,
156};
157
158bool etnaviv_cmd_validate_one(struct etnaviv_gpu *gpu, u32 *stream,
159			      unsigned int size,
160			      struct drm_etnaviv_gem_submit_reloc *relocs,
161			      unsigned int reloc_size)
162{
163	struct etna_validation_state state;
164	u32 *buf = stream;
165	u32 *end = buf + size;
166
167	state.gpu = gpu;
168	state.relocs = relocs;
169	state.num_relocs = reloc_size;
170	state.start = stream;
171
172	while (buf < end) {
173		u32 cmd = *buf;
174		unsigned int len, n, off;
175		unsigned int op = cmd >> 27;
176
177		switch (op) {
178		case FE_OPCODE_LOAD_STATE:
179			n = EXTRACT(cmd, VIV_FE_LOAD_STATE_HEADER_COUNT);
180			len = ALIGN(1 + n, 2);
181			if (buf + len > end)
182				break;
183
184			off = EXTRACT(cmd, VIV_FE_LOAD_STATE_HEADER_OFFSET);
185			if (!etnaviv_validate_load_state(&state, buf + 1,
186							 off, n))
187				return false;
188			break;
189
190		case FE_OPCODE_DRAW_2D:
191			n = EXTRACT(cmd, VIV_FE_DRAW_2D_HEADER_COUNT);
192			if (n == 0)
193				n = 256;
194			len = 2 + n * 2;
195			break;
196
197		default:
198			len = cmd_length[op];
199			if (len == 0) {
200				dev_err(gpu->dev, "%s: op %u not permitted at offset %tu\n",
201					__func__, op, buf - state.start);
202				return false;
203			}
204			break;
205		}
206
207		buf += len;
208	}
209
210	if (buf > end) {
211		dev_err(gpu->dev, "%s: commands overflow end of buffer: %tu > %u\n",
212			__func__, buf - state.start, size);
213		return false;
214	}
215
216	return true;
217}