1cc2d3216SMarc Zyngier /* 2cc2d3216SMarc Zyngier * Copyright (C) 2013, 2014 ARM Limited, All Rights Reserved. 3cc2d3216SMarc Zyngier * Author: Marc Zyngier <marc.zyngier@arm.com> 4cc2d3216SMarc Zyngier * 5cc2d3216SMarc Zyngier * This program is free software; you can redistribute it and/or modify 6cc2d3216SMarc Zyngier * it under the terms of the GNU General Public License version 2 as 7cc2d3216SMarc Zyngier * published by the Free Software Foundation. 8cc2d3216SMarc Zyngier * 9cc2d3216SMarc Zyngier * This program is distributed in the hope that it will be useful, 10cc2d3216SMarc Zyngier * but WITHOUT ANY WARRANTY; without even the implied warranty of 11cc2d3216SMarc Zyngier * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12cc2d3216SMarc Zyngier * GNU General Public License for more details. 13cc2d3216SMarc Zyngier * 14cc2d3216SMarc Zyngier * You should have received a copy of the GNU General Public License 15cc2d3216SMarc Zyngier * along with this program. If not, see <http://www.gnu.org/licenses/>. 16cc2d3216SMarc Zyngier */ 17cc2d3216SMarc Zyngier 183f010cf1STomasz Nowicki #include <linux/acpi.h> 198d3554b8SHanjun Guo #include <linux/acpi_iort.h> 20cc2d3216SMarc Zyngier #include <linux/bitmap.h> 21cc2d3216SMarc Zyngier #include <linux/cpu.h> 22cc2d3216SMarc Zyngier #include <linux/delay.h> 2344bb7e24SRobin Murphy #include <linux/dma-iommu.h> 24cc2d3216SMarc Zyngier #include <linux/interrupt.h> 253f010cf1STomasz Nowicki #include <linux/irqdomain.h> 26cc2d3216SMarc Zyngier #include <linux/log2.h> 27cc2d3216SMarc Zyngier #include <linux/mm.h> 28cc2d3216SMarc Zyngier #include <linux/msi.h> 29cc2d3216SMarc Zyngier #include <linux/of.h> 30cc2d3216SMarc Zyngier #include <linux/of_address.h> 31cc2d3216SMarc Zyngier #include <linux/of_irq.h> 32cc2d3216SMarc Zyngier #include <linux/of_pci.h> 33cc2d3216SMarc Zyngier #include <linux/of_platform.h> 34cc2d3216SMarc Zyngier #include <linux/percpu.h> 35cc2d3216SMarc Zyngier #include <linux/slab.h> 36cc2d3216SMarc Zyngier 3741a83e06SJoel Porquet #include <linux/irqchip.h> 38cc2d3216SMarc Zyngier #include <linux/irqchip/arm-gic-v3.h> 39cc2d3216SMarc Zyngier 40cc2d3216SMarc Zyngier #include <asm/cputype.h> 41cc2d3216SMarc Zyngier #include <asm/exception.h> 42cc2d3216SMarc Zyngier 4367510ccaSRobert Richter #include "irq-gic-common.h" 4467510ccaSRobert Richter 4594100970SRobert Richter #define ITS_FLAGS_CMDQ_NEEDS_FLUSHING (1ULL << 0) 4694100970SRobert Richter #define ITS_FLAGS_WORKAROUND_CAVIUM_22375 (1ULL << 1) 47fbf8f40eSGanapatrao Kulkarni #define ITS_FLAGS_WORKAROUND_CAVIUM_23144 (1ULL << 2) 48cc2d3216SMarc Zyngier 49c48ed51cSMarc Zyngier #define RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING (1 << 0) 50c48ed51cSMarc Zyngier 51cc2d3216SMarc Zyngier /* 52cc2d3216SMarc Zyngier * Collection structure - just an ID, and a redistributor address to 53cc2d3216SMarc Zyngier * ping. We use one per CPU as a bag of interrupts assigned to this 54cc2d3216SMarc Zyngier * CPU. 55cc2d3216SMarc Zyngier */ 56cc2d3216SMarc Zyngier struct its_collection { 57cc2d3216SMarc Zyngier u64 target_address; 58cc2d3216SMarc Zyngier u16 col_id; 59cc2d3216SMarc Zyngier }; 60cc2d3216SMarc Zyngier 61cc2d3216SMarc Zyngier /* 629347359aSShanker Donthineni * The ITS_BASER structure - contains memory information, cached 639347359aSShanker Donthineni * value of BASER register configuration and ITS page size. 64466b7d16SShanker Donthineni */ 65466b7d16SShanker Donthineni struct its_baser { 66466b7d16SShanker Donthineni void *base; 67466b7d16SShanker Donthineni u64 val; 68466b7d16SShanker Donthineni u32 order; 699347359aSShanker Donthineni u32 psz; 70466b7d16SShanker Donthineni }; 71466b7d16SShanker Donthineni 72466b7d16SShanker Donthineni /* 73cc2d3216SMarc Zyngier * The ITS structure - contains most of the infrastructure, with the 74841514abSMarc Zyngier * top-level MSI domain, the command queue, the collections, and the 75841514abSMarc Zyngier * list of devices writing to it. 76cc2d3216SMarc Zyngier */ 77cc2d3216SMarc Zyngier struct its_node { 78cc2d3216SMarc Zyngier raw_spinlock_t lock; 79cc2d3216SMarc Zyngier struct list_head entry; 80cc2d3216SMarc Zyngier void __iomem *base; 81db40f0a7STomasz Nowicki phys_addr_t phys_base; 82cc2d3216SMarc Zyngier struct its_cmd_block *cmd_base; 83cc2d3216SMarc Zyngier struct its_cmd_block *cmd_write; 84466b7d16SShanker Donthineni struct its_baser tables[GITS_BASER_NR_REGS]; 85cc2d3216SMarc Zyngier struct its_collection *collections; 86cc2d3216SMarc Zyngier struct list_head its_device_list; 87cc2d3216SMarc Zyngier u64 flags; 88cc2d3216SMarc Zyngier u32 ite_size; 89466b7d16SShanker Donthineni u32 device_ids; 90fbf8f40eSGanapatrao Kulkarni int numa_node; 91cc2d3216SMarc Zyngier }; 92cc2d3216SMarc Zyngier 93cc2d3216SMarc Zyngier #define ITS_ITT_ALIGN SZ_256 94cc2d3216SMarc Zyngier 952eca0d6cSShanker Donthineni /* Convert page order to size in bytes */ 962eca0d6cSShanker Donthineni #define PAGE_ORDER_TO_SIZE(o) (PAGE_SIZE << (o)) 972eca0d6cSShanker Donthineni 98591e5becSMarc Zyngier struct event_lpi_map { 99591e5becSMarc Zyngier unsigned long *lpi_map; 100591e5becSMarc Zyngier u16 *col_map; 101591e5becSMarc Zyngier irq_hw_number_t lpi_base; 102591e5becSMarc Zyngier int nr_lpis; 103591e5becSMarc Zyngier }; 104591e5becSMarc Zyngier 105cc2d3216SMarc Zyngier /* 106cc2d3216SMarc Zyngier * The ITS view of a device - belongs to an ITS, a collection, owns an 107cc2d3216SMarc Zyngier * interrupt translation table, and a list of interrupts. 108cc2d3216SMarc Zyngier */ 109cc2d3216SMarc Zyngier struct its_device { 110cc2d3216SMarc Zyngier struct list_head entry; 111cc2d3216SMarc Zyngier struct its_node *its; 112591e5becSMarc Zyngier struct event_lpi_map event_map; 113cc2d3216SMarc Zyngier void *itt; 114cc2d3216SMarc Zyngier u32 nr_ites; 115cc2d3216SMarc Zyngier u32 device_id; 116cc2d3216SMarc Zyngier }; 117cc2d3216SMarc Zyngier 1181ac19ca6SMarc Zyngier static LIST_HEAD(its_nodes); 1191ac19ca6SMarc Zyngier static DEFINE_SPINLOCK(its_lock); 1201ac19ca6SMarc Zyngier static struct rdists *gic_rdists; 121db40f0a7STomasz Nowicki static struct irq_domain *its_parent; 1221ac19ca6SMarc Zyngier 1231ac19ca6SMarc Zyngier #define gic_data_rdist() (raw_cpu_ptr(gic_rdists->rdist)) 1241ac19ca6SMarc Zyngier #define gic_data_rdist_rd_base() (gic_data_rdist()->rd_base) 1251ac19ca6SMarc Zyngier 126591e5becSMarc Zyngier static struct its_collection *dev_event_to_col(struct its_device *its_dev, 127591e5becSMarc Zyngier u32 event) 128591e5becSMarc Zyngier { 129591e5becSMarc Zyngier struct its_node *its = its_dev->its; 130591e5becSMarc Zyngier 131591e5becSMarc Zyngier return its->collections + its_dev->event_map.col_map[event]; 132591e5becSMarc Zyngier } 133591e5becSMarc Zyngier 134cc2d3216SMarc Zyngier /* 135cc2d3216SMarc Zyngier * ITS command descriptors - parameters to be encoded in a command 136cc2d3216SMarc Zyngier * block. 137cc2d3216SMarc Zyngier */ 138cc2d3216SMarc Zyngier struct its_cmd_desc { 139cc2d3216SMarc Zyngier union { 140cc2d3216SMarc Zyngier struct { 141cc2d3216SMarc Zyngier struct its_device *dev; 142cc2d3216SMarc Zyngier u32 event_id; 143cc2d3216SMarc Zyngier } its_inv_cmd; 144cc2d3216SMarc Zyngier 145cc2d3216SMarc Zyngier struct { 146cc2d3216SMarc Zyngier struct its_device *dev; 147cc2d3216SMarc Zyngier u32 event_id; 148cc2d3216SMarc Zyngier } its_int_cmd; 149cc2d3216SMarc Zyngier 150cc2d3216SMarc Zyngier struct { 151cc2d3216SMarc Zyngier struct its_device *dev; 152cc2d3216SMarc Zyngier int valid; 153cc2d3216SMarc Zyngier } its_mapd_cmd; 154cc2d3216SMarc Zyngier 155cc2d3216SMarc Zyngier struct { 156cc2d3216SMarc Zyngier struct its_collection *col; 157cc2d3216SMarc Zyngier int valid; 158cc2d3216SMarc Zyngier } its_mapc_cmd; 159cc2d3216SMarc Zyngier 160cc2d3216SMarc Zyngier struct { 161cc2d3216SMarc Zyngier struct its_device *dev; 162cc2d3216SMarc Zyngier u32 phys_id; 163cc2d3216SMarc Zyngier u32 event_id; 1646a25ad3aSMarc Zyngier } its_mapti_cmd; 165cc2d3216SMarc Zyngier 166cc2d3216SMarc Zyngier struct { 167cc2d3216SMarc Zyngier struct its_device *dev; 168cc2d3216SMarc Zyngier struct its_collection *col; 169591e5becSMarc Zyngier u32 event_id; 170cc2d3216SMarc Zyngier } its_movi_cmd; 171cc2d3216SMarc Zyngier 172cc2d3216SMarc Zyngier struct { 173cc2d3216SMarc Zyngier struct its_device *dev; 174cc2d3216SMarc Zyngier u32 event_id; 175cc2d3216SMarc Zyngier } its_discard_cmd; 176cc2d3216SMarc Zyngier 177cc2d3216SMarc Zyngier struct { 178cc2d3216SMarc Zyngier struct its_collection *col; 179cc2d3216SMarc Zyngier } its_invall_cmd; 180cc2d3216SMarc Zyngier }; 181cc2d3216SMarc Zyngier }; 182cc2d3216SMarc Zyngier 183cc2d3216SMarc Zyngier /* 184cc2d3216SMarc Zyngier * The ITS command block, which is what the ITS actually parses. 185cc2d3216SMarc Zyngier */ 186cc2d3216SMarc Zyngier struct its_cmd_block { 187cc2d3216SMarc Zyngier u64 raw_cmd[4]; 188cc2d3216SMarc Zyngier }; 189cc2d3216SMarc Zyngier 190cc2d3216SMarc Zyngier #define ITS_CMD_QUEUE_SZ SZ_64K 191cc2d3216SMarc Zyngier #define ITS_CMD_QUEUE_NR_ENTRIES (ITS_CMD_QUEUE_SZ / sizeof(struct its_cmd_block)) 192cc2d3216SMarc Zyngier 193cc2d3216SMarc Zyngier typedef struct its_collection *(*its_cmd_builder_t)(struct its_cmd_block *, 194cc2d3216SMarc Zyngier struct its_cmd_desc *); 195cc2d3216SMarc Zyngier 1964d36f136SMarc Zyngier static void its_mask_encode(u64 *raw_cmd, u64 val, int h, int l) 1974d36f136SMarc Zyngier { 1984d36f136SMarc Zyngier u64 mask = GENMASK_ULL(h, l); 1994d36f136SMarc Zyngier *raw_cmd &= ~mask; 2004d36f136SMarc Zyngier *raw_cmd |= (val << l) & mask; 2014d36f136SMarc Zyngier } 2024d36f136SMarc Zyngier 203cc2d3216SMarc Zyngier static void its_encode_cmd(struct its_cmd_block *cmd, u8 cmd_nr) 204cc2d3216SMarc Zyngier { 2054d36f136SMarc Zyngier its_mask_encode(&cmd->raw_cmd[0], cmd_nr, 7, 0); 206cc2d3216SMarc Zyngier } 207cc2d3216SMarc Zyngier 208cc2d3216SMarc Zyngier static void its_encode_devid(struct its_cmd_block *cmd, u32 devid) 209cc2d3216SMarc Zyngier { 2104d36f136SMarc Zyngier its_mask_encode(&cmd->raw_cmd[0], devid, 63, 32); 211cc2d3216SMarc Zyngier } 212cc2d3216SMarc Zyngier 213cc2d3216SMarc Zyngier static void its_encode_event_id(struct its_cmd_block *cmd, u32 id) 214cc2d3216SMarc Zyngier { 2154d36f136SMarc Zyngier its_mask_encode(&cmd->raw_cmd[1], id, 31, 0); 216cc2d3216SMarc Zyngier } 217cc2d3216SMarc Zyngier 218cc2d3216SMarc Zyngier static void its_encode_phys_id(struct its_cmd_block *cmd, u32 phys_id) 219cc2d3216SMarc Zyngier { 2204d36f136SMarc Zyngier its_mask_encode(&cmd->raw_cmd[1], phys_id, 63, 32); 221cc2d3216SMarc Zyngier } 222cc2d3216SMarc Zyngier 223cc2d3216SMarc Zyngier static void its_encode_size(struct its_cmd_block *cmd, u8 size) 224cc2d3216SMarc Zyngier { 2254d36f136SMarc Zyngier its_mask_encode(&cmd->raw_cmd[1], size, 4, 0); 226cc2d3216SMarc Zyngier } 227cc2d3216SMarc Zyngier 228cc2d3216SMarc Zyngier static void its_encode_itt(struct its_cmd_block *cmd, u64 itt_addr) 229cc2d3216SMarc Zyngier { 2304d36f136SMarc Zyngier its_mask_encode(&cmd->raw_cmd[2], itt_addr >> 8, 50, 8); 231cc2d3216SMarc Zyngier } 232cc2d3216SMarc Zyngier 233cc2d3216SMarc Zyngier static void its_encode_valid(struct its_cmd_block *cmd, int valid) 234cc2d3216SMarc Zyngier { 2354d36f136SMarc Zyngier its_mask_encode(&cmd->raw_cmd[2], !!valid, 63, 63); 236cc2d3216SMarc Zyngier } 237cc2d3216SMarc Zyngier 238cc2d3216SMarc Zyngier static void its_encode_target(struct its_cmd_block *cmd, u64 target_addr) 239cc2d3216SMarc Zyngier { 2404d36f136SMarc Zyngier its_mask_encode(&cmd->raw_cmd[2], target_addr >> 16, 50, 16); 241cc2d3216SMarc Zyngier } 242cc2d3216SMarc Zyngier 243cc2d3216SMarc Zyngier static void its_encode_collection(struct its_cmd_block *cmd, u16 col) 244cc2d3216SMarc Zyngier { 2454d36f136SMarc Zyngier its_mask_encode(&cmd->raw_cmd[2], col, 15, 0); 246cc2d3216SMarc Zyngier } 247cc2d3216SMarc Zyngier 248cc2d3216SMarc Zyngier static inline void its_fixup_cmd(struct its_cmd_block *cmd) 249cc2d3216SMarc Zyngier { 250cc2d3216SMarc Zyngier /* Let's fixup BE commands */ 251cc2d3216SMarc Zyngier cmd->raw_cmd[0] = cpu_to_le64(cmd->raw_cmd[0]); 252cc2d3216SMarc Zyngier cmd->raw_cmd[1] = cpu_to_le64(cmd->raw_cmd[1]); 253cc2d3216SMarc Zyngier cmd->raw_cmd[2] = cpu_to_le64(cmd->raw_cmd[2]); 254cc2d3216SMarc Zyngier cmd->raw_cmd[3] = cpu_to_le64(cmd->raw_cmd[3]); 255cc2d3216SMarc Zyngier } 256cc2d3216SMarc Zyngier 257cc2d3216SMarc Zyngier static struct its_collection *its_build_mapd_cmd(struct its_cmd_block *cmd, 258cc2d3216SMarc Zyngier struct its_cmd_desc *desc) 259cc2d3216SMarc Zyngier { 260cc2d3216SMarc Zyngier unsigned long itt_addr; 261c8481267SMarc Zyngier u8 size = ilog2(desc->its_mapd_cmd.dev->nr_ites); 262cc2d3216SMarc Zyngier 263cc2d3216SMarc Zyngier itt_addr = virt_to_phys(desc->its_mapd_cmd.dev->itt); 264cc2d3216SMarc Zyngier itt_addr = ALIGN(itt_addr, ITS_ITT_ALIGN); 265cc2d3216SMarc Zyngier 266cc2d3216SMarc Zyngier its_encode_cmd(cmd, GITS_CMD_MAPD); 267cc2d3216SMarc Zyngier its_encode_devid(cmd, desc->its_mapd_cmd.dev->device_id); 268cc2d3216SMarc Zyngier its_encode_size(cmd, size - 1); 269cc2d3216SMarc Zyngier its_encode_itt(cmd, itt_addr); 270cc2d3216SMarc Zyngier its_encode_valid(cmd, desc->its_mapd_cmd.valid); 271cc2d3216SMarc Zyngier 272cc2d3216SMarc Zyngier its_fixup_cmd(cmd); 273cc2d3216SMarc Zyngier 274591e5becSMarc Zyngier return NULL; 275cc2d3216SMarc Zyngier } 276cc2d3216SMarc Zyngier 277cc2d3216SMarc Zyngier static struct its_collection *its_build_mapc_cmd(struct its_cmd_block *cmd, 278cc2d3216SMarc Zyngier struct its_cmd_desc *desc) 279cc2d3216SMarc Zyngier { 280cc2d3216SMarc Zyngier its_encode_cmd(cmd, GITS_CMD_MAPC); 281cc2d3216SMarc Zyngier its_encode_collection(cmd, desc->its_mapc_cmd.col->col_id); 282cc2d3216SMarc Zyngier its_encode_target(cmd, desc->its_mapc_cmd.col->target_address); 283cc2d3216SMarc Zyngier its_encode_valid(cmd, desc->its_mapc_cmd.valid); 284cc2d3216SMarc Zyngier 285cc2d3216SMarc Zyngier its_fixup_cmd(cmd); 286cc2d3216SMarc Zyngier 287cc2d3216SMarc Zyngier return desc->its_mapc_cmd.col; 288cc2d3216SMarc Zyngier } 289cc2d3216SMarc Zyngier 2906a25ad3aSMarc Zyngier static struct its_collection *its_build_mapti_cmd(struct its_cmd_block *cmd, 291cc2d3216SMarc Zyngier struct its_cmd_desc *desc) 292cc2d3216SMarc Zyngier { 293591e5becSMarc Zyngier struct its_collection *col; 294591e5becSMarc Zyngier 2956a25ad3aSMarc Zyngier col = dev_event_to_col(desc->its_mapti_cmd.dev, 2966a25ad3aSMarc Zyngier desc->its_mapti_cmd.event_id); 297591e5becSMarc Zyngier 2986a25ad3aSMarc Zyngier its_encode_cmd(cmd, GITS_CMD_MAPTI); 2996a25ad3aSMarc Zyngier its_encode_devid(cmd, desc->its_mapti_cmd.dev->device_id); 3006a25ad3aSMarc Zyngier its_encode_event_id(cmd, desc->its_mapti_cmd.event_id); 3016a25ad3aSMarc Zyngier its_encode_phys_id(cmd, desc->its_mapti_cmd.phys_id); 302591e5becSMarc Zyngier its_encode_collection(cmd, col->col_id); 303cc2d3216SMarc Zyngier 304cc2d3216SMarc Zyngier its_fixup_cmd(cmd); 305cc2d3216SMarc Zyngier 306591e5becSMarc Zyngier return col; 307cc2d3216SMarc Zyngier } 308cc2d3216SMarc Zyngier 309cc2d3216SMarc Zyngier static struct its_collection *its_build_movi_cmd(struct its_cmd_block *cmd, 310cc2d3216SMarc Zyngier struct its_cmd_desc *desc) 311cc2d3216SMarc Zyngier { 312591e5becSMarc Zyngier struct its_collection *col; 313591e5becSMarc Zyngier 314591e5becSMarc Zyngier col = dev_event_to_col(desc->its_movi_cmd.dev, 315591e5becSMarc Zyngier desc->its_movi_cmd.event_id); 316591e5becSMarc Zyngier 317cc2d3216SMarc Zyngier its_encode_cmd(cmd, GITS_CMD_MOVI); 318cc2d3216SMarc Zyngier its_encode_devid(cmd, desc->its_movi_cmd.dev->device_id); 319591e5becSMarc Zyngier its_encode_event_id(cmd, desc->its_movi_cmd.event_id); 320cc2d3216SMarc Zyngier its_encode_collection(cmd, desc->its_movi_cmd.col->col_id); 321cc2d3216SMarc Zyngier 322cc2d3216SMarc Zyngier its_fixup_cmd(cmd); 323cc2d3216SMarc Zyngier 324591e5becSMarc Zyngier return col; 325cc2d3216SMarc Zyngier } 326cc2d3216SMarc Zyngier 327cc2d3216SMarc Zyngier static struct its_collection *its_build_discard_cmd(struct its_cmd_block *cmd, 328cc2d3216SMarc Zyngier struct its_cmd_desc *desc) 329cc2d3216SMarc Zyngier { 330591e5becSMarc Zyngier struct its_collection *col; 331591e5becSMarc Zyngier 332591e5becSMarc Zyngier col = dev_event_to_col(desc->its_discard_cmd.dev, 333591e5becSMarc Zyngier desc->its_discard_cmd.event_id); 334591e5becSMarc Zyngier 335cc2d3216SMarc Zyngier its_encode_cmd(cmd, GITS_CMD_DISCARD); 336cc2d3216SMarc Zyngier its_encode_devid(cmd, desc->its_discard_cmd.dev->device_id); 337cc2d3216SMarc Zyngier its_encode_event_id(cmd, desc->its_discard_cmd.event_id); 338cc2d3216SMarc Zyngier 339cc2d3216SMarc Zyngier its_fixup_cmd(cmd); 340cc2d3216SMarc Zyngier 341591e5becSMarc Zyngier return col; 342cc2d3216SMarc Zyngier } 343cc2d3216SMarc Zyngier 344cc2d3216SMarc Zyngier static struct its_collection *its_build_inv_cmd(struct its_cmd_block *cmd, 345cc2d3216SMarc Zyngier struct its_cmd_desc *desc) 346cc2d3216SMarc Zyngier { 347591e5becSMarc Zyngier struct its_collection *col; 348591e5becSMarc Zyngier 349591e5becSMarc Zyngier col = dev_event_to_col(desc->its_inv_cmd.dev, 350591e5becSMarc Zyngier desc->its_inv_cmd.event_id); 351591e5becSMarc Zyngier 352cc2d3216SMarc Zyngier its_encode_cmd(cmd, GITS_CMD_INV); 353cc2d3216SMarc Zyngier its_encode_devid(cmd, desc->its_inv_cmd.dev->device_id); 354cc2d3216SMarc Zyngier its_encode_event_id(cmd, desc->its_inv_cmd.event_id); 355cc2d3216SMarc Zyngier 356cc2d3216SMarc Zyngier its_fixup_cmd(cmd); 357cc2d3216SMarc Zyngier 358591e5becSMarc Zyngier return col; 359cc2d3216SMarc Zyngier } 360cc2d3216SMarc Zyngier 361cc2d3216SMarc Zyngier static struct its_collection *its_build_invall_cmd(struct its_cmd_block *cmd, 362cc2d3216SMarc Zyngier struct its_cmd_desc *desc) 363cc2d3216SMarc Zyngier { 364cc2d3216SMarc Zyngier its_encode_cmd(cmd, GITS_CMD_INVALL); 365cc2d3216SMarc Zyngier its_encode_collection(cmd, desc->its_mapc_cmd.col->col_id); 366cc2d3216SMarc Zyngier 367cc2d3216SMarc Zyngier its_fixup_cmd(cmd); 368cc2d3216SMarc Zyngier 369cc2d3216SMarc Zyngier return NULL; 370cc2d3216SMarc Zyngier } 371cc2d3216SMarc Zyngier 372cc2d3216SMarc Zyngier static u64 its_cmd_ptr_to_offset(struct its_node *its, 373cc2d3216SMarc Zyngier struct its_cmd_block *ptr) 374cc2d3216SMarc Zyngier { 375cc2d3216SMarc Zyngier return (ptr - its->cmd_base) * sizeof(*ptr); 376cc2d3216SMarc Zyngier } 377cc2d3216SMarc Zyngier 378cc2d3216SMarc Zyngier static int its_queue_full(struct its_node *its) 379cc2d3216SMarc Zyngier { 380cc2d3216SMarc Zyngier int widx; 381cc2d3216SMarc Zyngier int ridx; 382cc2d3216SMarc Zyngier 383cc2d3216SMarc Zyngier widx = its->cmd_write - its->cmd_base; 384cc2d3216SMarc Zyngier ridx = readl_relaxed(its->base + GITS_CREADR) / sizeof(struct its_cmd_block); 385cc2d3216SMarc Zyngier 386cc2d3216SMarc Zyngier /* This is incredibly unlikely to happen, unless the ITS locks up. */ 387cc2d3216SMarc Zyngier if (((widx + 1) % ITS_CMD_QUEUE_NR_ENTRIES) == ridx) 388cc2d3216SMarc Zyngier return 1; 389cc2d3216SMarc Zyngier 390cc2d3216SMarc Zyngier return 0; 391cc2d3216SMarc Zyngier } 392cc2d3216SMarc Zyngier 393cc2d3216SMarc Zyngier static struct its_cmd_block *its_allocate_entry(struct its_node *its) 394cc2d3216SMarc Zyngier { 395cc2d3216SMarc Zyngier struct its_cmd_block *cmd; 396cc2d3216SMarc Zyngier u32 count = 1000000; /* 1s! */ 397cc2d3216SMarc Zyngier 398cc2d3216SMarc Zyngier while (its_queue_full(its)) { 399cc2d3216SMarc Zyngier count--; 400cc2d3216SMarc Zyngier if (!count) { 401cc2d3216SMarc Zyngier pr_err_ratelimited("ITS queue not draining\n"); 402cc2d3216SMarc Zyngier return NULL; 403cc2d3216SMarc Zyngier } 404cc2d3216SMarc Zyngier cpu_relax(); 405cc2d3216SMarc Zyngier udelay(1); 406cc2d3216SMarc Zyngier } 407cc2d3216SMarc Zyngier 408cc2d3216SMarc Zyngier cmd = its->cmd_write++; 409cc2d3216SMarc Zyngier 410cc2d3216SMarc Zyngier /* Handle queue wrapping */ 411cc2d3216SMarc Zyngier if (its->cmd_write == (its->cmd_base + ITS_CMD_QUEUE_NR_ENTRIES)) 412cc2d3216SMarc Zyngier its->cmd_write = its->cmd_base; 413cc2d3216SMarc Zyngier 41434d677a9SMarc Zyngier /* Clear command */ 41534d677a9SMarc Zyngier cmd->raw_cmd[0] = 0; 41634d677a9SMarc Zyngier cmd->raw_cmd[1] = 0; 41734d677a9SMarc Zyngier cmd->raw_cmd[2] = 0; 41834d677a9SMarc Zyngier cmd->raw_cmd[3] = 0; 41934d677a9SMarc Zyngier 420cc2d3216SMarc Zyngier return cmd; 421cc2d3216SMarc Zyngier } 422cc2d3216SMarc Zyngier 423cc2d3216SMarc Zyngier static struct its_cmd_block *its_post_commands(struct its_node *its) 424cc2d3216SMarc Zyngier { 425cc2d3216SMarc Zyngier u64 wr = its_cmd_ptr_to_offset(its, its->cmd_write); 426cc2d3216SMarc Zyngier 427cc2d3216SMarc Zyngier writel_relaxed(wr, its->base + GITS_CWRITER); 428cc2d3216SMarc Zyngier 429cc2d3216SMarc Zyngier return its->cmd_write; 430cc2d3216SMarc Zyngier } 431cc2d3216SMarc Zyngier 432cc2d3216SMarc Zyngier static void its_flush_cmd(struct its_node *its, struct its_cmd_block *cmd) 433cc2d3216SMarc Zyngier { 434cc2d3216SMarc Zyngier /* 435cc2d3216SMarc Zyngier * Make sure the commands written to memory are observable by 436cc2d3216SMarc Zyngier * the ITS. 437cc2d3216SMarc Zyngier */ 438cc2d3216SMarc Zyngier if (its->flags & ITS_FLAGS_CMDQ_NEEDS_FLUSHING) 439328191c0SVladimir Murzin gic_flush_dcache_to_poc(cmd, sizeof(*cmd)); 440cc2d3216SMarc Zyngier else 441cc2d3216SMarc Zyngier dsb(ishst); 442cc2d3216SMarc Zyngier } 443cc2d3216SMarc Zyngier 444cc2d3216SMarc Zyngier static void its_wait_for_range_completion(struct its_node *its, 445cc2d3216SMarc Zyngier struct its_cmd_block *from, 446cc2d3216SMarc Zyngier struct its_cmd_block *to) 447cc2d3216SMarc Zyngier { 448cc2d3216SMarc Zyngier u64 rd_idx, from_idx, to_idx; 449cc2d3216SMarc Zyngier u32 count = 1000000; /* 1s! */ 450cc2d3216SMarc Zyngier 451cc2d3216SMarc Zyngier from_idx = its_cmd_ptr_to_offset(its, from); 452cc2d3216SMarc Zyngier to_idx = its_cmd_ptr_to_offset(its, to); 453cc2d3216SMarc Zyngier 454cc2d3216SMarc Zyngier while (1) { 455cc2d3216SMarc Zyngier rd_idx = readl_relaxed(its->base + GITS_CREADR); 456cc2d3216SMarc Zyngier if (rd_idx >= to_idx || rd_idx < from_idx) 457cc2d3216SMarc Zyngier break; 458cc2d3216SMarc Zyngier 459cc2d3216SMarc Zyngier count--; 460cc2d3216SMarc Zyngier if (!count) { 461cc2d3216SMarc Zyngier pr_err_ratelimited("ITS queue timeout\n"); 462cc2d3216SMarc Zyngier return; 463cc2d3216SMarc Zyngier } 464cc2d3216SMarc Zyngier cpu_relax(); 465cc2d3216SMarc Zyngier udelay(1); 466cc2d3216SMarc Zyngier } 467cc2d3216SMarc Zyngier } 468cc2d3216SMarc Zyngier 469cc2d3216SMarc Zyngier static void its_send_single_command(struct its_node *its, 470cc2d3216SMarc Zyngier its_cmd_builder_t builder, 471cc2d3216SMarc Zyngier struct its_cmd_desc *desc) 472cc2d3216SMarc Zyngier { 473cc2d3216SMarc Zyngier struct its_cmd_block *cmd, *sync_cmd, *next_cmd; 474cc2d3216SMarc Zyngier struct its_collection *sync_col; 4753e39e8f5SMarc Zyngier unsigned long flags; 476cc2d3216SMarc Zyngier 4773e39e8f5SMarc Zyngier raw_spin_lock_irqsave(&its->lock, flags); 478cc2d3216SMarc Zyngier 479cc2d3216SMarc Zyngier cmd = its_allocate_entry(its); 480cc2d3216SMarc Zyngier if (!cmd) { /* We're soooooo screewed... */ 481cc2d3216SMarc Zyngier pr_err_ratelimited("ITS can't allocate, dropping command\n"); 4823e39e8f5SMarc Zyngier raw_spin_unlock_irqrestore(&its->lock, flags); 483cc2d3216SMarc Zyngier return; 484cc2d3216SMarc Zyngier } 485cc2d3216SMarc Zyngier sync_col = builder(cmd, desc); 486cc2d3216SMarc Zyngier its_flush_cmd(its, cmd); 487cc2d3216SMarc Zyngier 488cc2d3216SMarc Zyngier if (sync_col) { 489cc2d3216SMarc Zyngier sync_cmd = its_allocate_entry(its); 490cc2d3216SMarc Zyngier if (!sync_cmd) { 491cc2d3216SMarc Zyngier pr_err_ratelimited("ITS can't SYNC, skipping\n"); 492cc2d3216SMarc Zyngier goto post; 493cc2d3216SMarc Zyngier } 494cc2d3216SMarc Zyngier its_encode_cmd(sync_cmd, GITS_CMD_SYNC); 495cc2d3216SMarc Zyngier its_encode_target(sync_cmd, sync_col->target_address); 496cc2d3216SMarc Zyngier its_fixup_cmd(sync_cmd); 497cc2d3216SMarc Zyngier its_flush_cmd(its, sync_cmd); 498cc2d3216SMarc Zyngier } 499cc2d3216SMarc Zyngier 500cc2d3216SMarc Zyngier post: 501cc2d3216SMarc Zyngier next_cmd = its_post_commands(its); 5023e39e8f5SMarc Zyngier raw_spin_unlock_irqrestore(&its->lock, flags); 503cc2d3216SMarc Zyngier 504cc2d3216SMarc Zyngier its_wait_for_range_completion(its, cmd, next_cmd); 505cc2d3216SMarc Zyngier } 506cc2d3216SMarc Zyngier 507cc2d3216SMarc Zyngier static void its_send_inv(struct its_device *dev, u32 event_id) 508cc2d3216SMarc Zyngier { 509cc2d3216SMarc Zyngier struct its_cmd_desc desc; 510cc2d3216SMarc Zyngier 511cc2d3216SMarc Zyngier desc.its_inv_cmd.dev = dev; 512cc2d3216SMarc Zyngier desc.its_inv_cmd.event_id = event_id; 513cc2d3216SMarc Zyngier 514cc2d3216SMarc Zyngier its_send_single_command(dev->its, its_build_inv_cmd, &desc); 515cc2d3216SMarc Zyngier } 516cc2d3216SMarc Zyngier 517cc2d3216SMarc Zyngier static void its_send_mapd(struct its_device *dev, int valid) 518cc2d3216SMarc Zyngier { 519cc2d3216SMarc Zyngier struct its_cmd_desc desc; 520cc2d3216SMarc Zyngier 521cc2d3216SMarc Zyngier desc.its_mapd_cmd.dev = dev; 522cc2d3216SMarc Zyngier desc.its_mapd_cmd.valid = !!valid; 523cc2d3216SMarc Zyngier 524cc2d3216SMarc Zyngier its_send_single_command(dev->its, its_build_mapd_cmd, &desc); 525cc2d3216SMarc Zyngier } 526cc2d3216SMarc Zyngier 527cc2d3216SMarc Zyngier static void its_send_mapc(struct its_node *its, struct its_collection *col, 528cc2d3216SMarc Zyngier int valid) 529cc2d3216SMarc Zyngier { 530cc2d3216SMarc Zyngier struct its_cmd_desc desc; 531cc2d3216SMarc Zyngier 532cc2d3216SMarc Zyngier desc.its_mapc_cmd.col = col; 533cc2d3216SMarc Zyngier desc.its_mapc_cmd.valid = !!valid; 534cc2d3216SMarc Zyngier 535cc2d3216SMarc Zyngier its_send_single_command(its, its_build_mapc_cmd, &desc); 536cc2d3216SMarc Zyngier } 537cc2d3216SMarc Zyngier 5386a25ad3aSMarc Zyngier static void its_send_mapti(struct its_device *dev, u32 irq_id, u32 id) 539cc2d3216SMarc Zyngier { 540cc2d3216SMarc Zyngier struct its_cmd_desc desc; 541cc2d3216SMarc Zyngier 5426a25ad3aSMarc Zyngier desc.its_mapti_cmd.dev = dev; 5436a25ad3aSMarc Zyngier desc.its_mapti_cmd.phys_id = irq_id; 5446a25ad3aSMarc Zyngier desc.its_mapti_cmd.event_id = id; 545cc2d3216SMarc Zyngier 5466a25ad3aSMarc Zyngier its_send_single_command(dev->its, its_build_mapti_cmd, &desc); 547cc2d3216SMarc Zyngier } 548cc2d3216SMarc Zyngier 549cc2d3216SMarc Zyngier static void its_send_movi(struct its_device *dev, 550cc2d3216SMarc Zyngier struct its_collection *col, u32 id) 551cc2d3216SMarc Zyngier { 552cc2d3216SMarc Zyngier struct its_cmd_desc desc; 553cc2d3216SMarc Zyngier 554cc2d3216SMarc Zyngier desc.its_movi_cmd.dev = dev; 555cc2d3216SMarc Zyngier desc.its_movi_cmd.col = col; 556591e5becSMarc Zyngier desc.its_movi_cmd.event_id = id; 557cc2d3216SMarc Zyngier 558cc2d3216SMarc Zyngier its_send_single_command(dev->its, its_build_movi_cmd, &desc); 559cc2d3216SMarc Zyngier } 560cc2d3216SMarc Zyngier 561cc2d3216SMarc Zyngier static void its_send_discard(struct its_device *dev, u32 id) 562cc2d3216SMarc Zyngier { 563cc2d3216SMarc Zyngier struct its_cmd_desc desc; 564cc2d3216SMarc Zyngier 565cc2d3216SMarc Zyngier desc.its_discard_cmd.dev = dev; 566cc2d3216SMarc Zyngier desc.its_discard_cmd.event_id = id; 567cc2d3216SMarc Zyngier 568cc2d3216SMarc Zyngier its_send_single_command(dev->its, its_build_discard_cmd, &desc); 569cc2d3216SMarc Zyngier } 570cc2d3216SMarc Zyngier 571cc2d3216SMarc Zyngier static void its_send_invall(struct its_node *its, struct its_collection *col) 572cc2d3216SMarc Zyngier { 573cc2d3216SMarc Zyngier struct its_cmd_desc desc; 574cc2d3216SMarc Zyngier 575cc2d3216SMarc Zyngier desc.its_invall_cmd.col = col; 576cc2d3216SMarc Zyngier 577cc2d3216SMarc Zyngier its_send_single_command(its, its_build_invall_cmd, &desc); 578cc2d3216SMarc Zyngier } 579c48ed51cSMarc Zyngier 580c48ed51cSMarc Zyngier /* 581c48ed51cSMarc Zyngier * irqchip functions - assumes MSI, mostly. 582c48ed51cSMarc Zyngier */ 583c48ed51cSMarc Zyngier 584c48ed51cSMarc Zyngier static inline u32 its_get_event_id(struct irq_data *d) 585c48ed51cSMarc Zyngier { 586c48ed51cSMarc Zyngier struct its_device *its_dev = irq_data_get_irq_chip_data(d); 587591e5becSMarc Zyngier return d->hwirq - its_dev->event_map.lpi_base; 588c48ed51cSMarc Zyngier } 589c48ed51cSMarc Zyngier 590c48ed51cSMarc Zyngier static void lpi_set_config(struct irq_data *d, bool enable) 591c48ed51cSMarc Zyngier { 592c48ed51cSMarc Zyngier struct its_device *its_dev = irq_data_get_irq_chip_data(d); 593c48ed51cSMarc Zyngier irq_hw_number_t hwirq = d->hwirq; 594c48ed51cSMarc Zyngier u32 id = its_get_event_id(d); 595c48ed51cSMarc Zyngier u8 *cfg = page_address(gic_rdists->prop_page) + hwirq - 8192; 596c48ed51cSMarc Zyngier 597c48ed51cSMarc Zyngier if (enable) 598c48ed51cSMarc Zyngier *cfg |= LPI_PROP_ENABLED; 599c48ed51cSMarc Zyngier else 600c48ed51cSMarc Zyngier *cfg &= ~LPI_PROP_ENABLED; 601c48ed51cSMarc Zyngier 602c48ed51cSMarc Zyngier /* 603c48ed51cSMarc Zyngier * Make the above write visible to the redistributors. 604c48ed51cSMarc Zyngier * And yes, we're flushing exactly: One. Single. Byte. 605c48ed51cSMarc Zyngier * Humpf... 606c48ed51cSMarc Zyngier */ 607c48ed51cSMarc Zyngier if (gic_rdists->flags & RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING) 608328191c0SVladimir Murzin gic_flush_dcache_to_poc(cfg, sizeof(*cfg)); 609c48ed51cSMarc Zyngier else 610c48ed51cSMarc Zyngier dsb(ishst); 611c48ed51cSMarc Zyngier its_send_inv(its_dev, id); 612c48ed51cSMarc Zyngier } 613c48ed51cSMarc Zyngier 614c48ed51cSMarc Zyngier static void its_mask_irq(struct irq_data *d) 615c48ed51cSMarc Zyngier { 616c48ed51cSMarc Zyngier lpi_set_config(d, false); 617c48ed51cSMarc Zyngier } 618c48ed51cSMarc Zyngier 619c48ed51cSMarc Zyngier static void its_unmask_irq(struct irq_data *d) 620c48ed51cSMarc Zyngier { 621c48ed51cSMarc Zyngier lpi_set_config(d, true); 622c48ed51cSMarc Zyngier } 623c48ed51cSMarc Zyngier 624c48ed51cSMarc Zyngier static int its_set_affinity(struct irq_data *d, const struct cpumask *mask_val, 625c48ed51cSMarc Zyngier bool force) 626c48ed51cSMarc Zyngier { 627fbf8f40eSGanapatrao Kulkarni unsigned int cpu; 628fbf8f40eSGanapatrao Kulkarni const struct cpumask *cpu_mask = cpu_online_mask; 629c48ed51cSMarc Zyngier struct its_device *its_dev = irq_data_get_irq_chip_data(d); 630c48ed51cSMarc Zyngier struct its_collection *target_col; 631c48ed51cSMarc Zyngier u32 id = its_get_event_id(d); 632c48ed51cSMarc Zyngier 633fbf8f40eSGanapatrao Kulkarni /* lpi cannot be routed to a redistributor that is on a foreign node */ 634fbf8f40eSGanapatrao Kulkarni if (its_dev->its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_23144) { 635fbf8f40eSGanapatrao Kulkarni if (its_dev->its->numa_node >= 0) { 636fbf8f40eSGanapatrao Kulkarni cpu_mask = cpumask_of_node(its_dev->its->numa_node); 637fbf8f40eSGanapatrao Kulkarni if (!cpumask_intersects(mask_val, cpu_mask)) 638fbf8f40eSGanapatrao Kulkarni return -EINVAL; 639fbf8f40eSGanapatrao Kulkarni } 640fbf8f40eSGanapatrao Kulkarni } 641fbf8f40eSGanapatrao Kulkarni 642fbf8f40eSGanapatrao Kulkarni cpu = cpumask_any_and(mask_val, cpu_mask); 643fbf8f40eSGanapatrao Kulkarni 644c48ed51cSMarc Zyngier if (cpu >= nr_cpu_ids) 645c48ed51cSMarc Zyngier return -EINVAL; 646c48ed51cSMarc Zyngier 6478b8d94a7SMaJun /* don't set the affinity when the target cpu is same as current one */ 6488b8d94a7SMaJun if (cpu != its_dev->event_map.col_map[id]) { 649c48ed51cSMarc Zyngier target_col = &its_dev->its->collections[cpu]; 650c48ed51cSMarc Zyngier its_send_movi(its_dev, target_col, id); 651591e5becSMarc Zyngier its_dev->event_map.col_map[id] = cpu; 6528b8d94a7SMaJun } 653c48ed51cSMarc Zyngier 654c48ed51cSMarc Zyngier return IRQ_SET_MASK_OK_DONE; 655c48ed51cSMarc Zyngier } 656c48ed51cSMarc Zyngier 657b48ac83dSMarc Zyngier static void its_irq_compose_msi_msg(struct irq_data *d, struct msi_msg *msg) 658b48ac83dSMarc Zyngier { 659b48ac83dSMarc Zyngier struct its_device *its_dev = irq_data_get_irq_chip_data(d); 660b48ac83dSMarc Zyngier struct its_node *its; 661b48ac83dSMarc Zyngier u64 addr; 662b48ac83dSMarc Zyngier 663b48ac83dSMarc Zyngier its = its_dev->its; 664b48ac83dSMarc Zyngier addr = its->phys_base + GITS_TRANSLATER; 665b48ac83dSMarc Zyngier 666b11283ebSVladimir Murzin msg->address_lo = lower_32_bits(addr); 667b11283ebSVladimir Murzin msg->address_hi = upper_32_bits(addr); 668b48ac83dSMarc Zyngier msg->data = its_get_event_id(d); 66944bb7e24SRobin Murphy 67044bb7e24SRobin Murphy iommu_dma_map_msi_msg(d->irq, msg); 671b48ac83dSMarc Zyngier } 672b48ac83dSMarc Zyngier 673c48ed51cSMarc Zyngier static struct irq_chip its_irq_chip = { 674c48ed51cSMarc Zyngier .name = "ITS", 675c48ed51cSMarc Zyngier .irq_mask = its_mask_irq, 676c48ed51cSMarc Zyngier .irq_unmask = its_unmask_irq, 677004fa08dSAshok Kumar .irq_eoi = irq_chip_eoi_parent, 678c48ed51cSMarc Zyngier .irq_set_affinity = its_set_affinity, 679b48ac83dSMarc Zyngier .irq_compose_msi_msg = its_irq_compose_msi_msg, 680b48ac83dSMarc Zyngier }; 681b48ac83dSMarc Zyngier 682bf9529f8SMarc Zyngier /* 683bf9529f8SMarc Zyngier * How we allocate LPIs: 684bf9529f8SMarc Zyngier * 685bf9529f8SMarc Zyngier * The GIC has id_bits bits for interrupt identifiers. From there, we 686bf9529f8SMarc Zyngier * must subtract 8192 which are reserved for SGIs/PPIs/SPIs. Then, as 687bf9529f8SMarc Zyngier * we allocate LPIs by chunks of 32, we can shift the whole thing by 5 688bf9529f8SMarc Zyngier * bits to the right. 689bf9529f8SMarc Zyngier * 690bf9529f8SMarc Zyngier * This gives us (((1UL << id_bits) - 8192) >> 5) possible allocations. 691bf9529f8SMarc Zyngier */ 692bf9529f8SMarc Zyngier #define IRQS_PER_CHUNK_SHIFT 5 693bf9529f8SMarc Zyngier #define IRQS_PER_CHUNK (1 << IRQS_PER_CHUNK_SHIFT) 6946c31e123SShanker Donthineni #define ITS_MAX_LPI_NRBITS 16 /* 64K LPIs */ 695bf9529f8SMarc Zyngier 696bf9529f8SMarc Zyngier static unsigned long *lpi_bitmap; 697bf9529f8SMarc Zyngier static u32 lpi_chunks; 6986c31e123SShanker Donthineni static u32 lpi_id_bits; 699bf9529f8SMarc Zyngier static DEFINE_SPINLOCK(lpi_lock); 700bf9529f8SMarc Zyngier 701bf9529f8SMarc Zyngier static int its_lpi_to_chunk(int lpi) 702bf9529f8SMarc Zyngier { 703bf9529f8SMarc Zyngier return (lpi - 8192) >> IRQS_PER_CHUNK_SHIFT; 704bf9529f8SMarc Zyngier } 705bf9529f8SMarc Zyngier 706bf9529f8SMarc Zyngier static int its_chunk_to_lpi(int chunk) 707bf9529f8SMarc Zyngier { 708bf9529f8SMarc Zyngier return (chunk << IRQS_PER_CHUNK_SHIFT) + 8192; 709bf9529f8SMarc Zyngier } 710bf9529f8SMarc Zyngier 71104a0e4deSTomasz Nowicki static int __init its_lpi_init(u32 id_bits) 712bf9529f8SMarc Zyngier { 713bf9529f8SMarc Zyngier lpi_chunks = its_lpi_to_chunk(1UL << id_bits); 714bf9529f8SMarc Zyngier 715bf9529f8SMarc Zyngier lpi_bitmap = kzalloc(BITS_TO_LONGS(lpi_chunks) * sizeof(long), 716bf9529f8SMarc Zyngier GFP_KERNEL); 717bf9529f8SMarc Zyngier if (!lpi_bitmap) { 718bf9529f8SMarc Zyngier lpi_chunks = 0; 719bf9529f8SMarc Zyngier return -ENOMEM; 720bf9529f8SMarc Zyngier } 721bf9529f8SMarc Zyngier 722bf9529f8SMarc Zyngier pr_info("ITS: Allocated %d chunks for LPIs\n", (int)lpi_chunks); 723bf9529f8SMarc Zyngier return 0; 724bf9529f8SMarc Zyngier } 725bf9529f8SMarc Zyngier 726bf9529f8SMarc Zyngier static unsigned long *its_lpi_alloc_chunks(int nr_irqs, int *base, int *nr_ids) 727bf9529f8SMarc Zyngier { 728bf9529f8SMarc Zyngier unsigned long *bitmap = NULL; 729bf9529f8SMarc Zyngier int chunk_id; 730bf9529f8SMarc Zyngier int nr_chunks; 731bf9529f8SMarc Zyngier int i; 732bf9529f8SMarc Zyngier 733bf9529f8SMarc Zyngier nr_chunks = DIV_ROUND_UP(nr_irqs, IRQS_PER_CHUNK); 734bf9529f8SMarc Zyngier 735bf9529f8SMarc Zyngier spin_lock(&lpi_lock); 736bf9529f8SMarc Zyngier 737bf9529f8SMarc Zyngier do { 738bf9529f8SMarc Zyngier chunk_id = bitmap_find_next_zero_area(lpi_bitmap, lpi_chunks, 739bf9529f8SMarc Zyngier 0, nr_chunks, 0); 740bf9529f8SMarc Zyngier if (chunk_id < lpi_chunks) 741bf9529f8SMarc Zyngier break; 742bf9529f8SMarc Zyngier 743bf9529f8SMarc Zyngier nr_chunks--; 744bf9529f8SMarc Zyngier } while (nr_chunks > 0); 745bf9529f8SMarc Zyngier 746bf9529f8SMarc Zyngier if (!nr_chunks) 747bf9529f8SMarc Zyngier goto out; 748bf9529f8SMarc Zyngier 749bf9529f8SMarc Zyngier bitmap = kzalloc(BITS_TO_LONGS(nr_chunks * IRQS_PER_CHUNK) * sizeof (long), 750bf9529f8SMarc Zyngier GFP_ATOMIC); 751bf9529f8SMarc Zyngier if (!bitmap) 752bf9529f8SMarc Zyngier goto out; 753bf9529f8SMarc Zyngier 754bf9529f8SMarc Zyngier for (i = 0; i < nr_chunks; i++) 755bf9529f8SMarc Zyngier set_bit(chunk_id + i, lpi_bitmap); 756bf9529f8SMarc Zyngier 757bf9529f8SMarc Zyngier *base = its_chunk_to_lpi(chunk_id); 758bf9529f8SMarc Zyngier *nr_ids = nr_chunks * IRQS_PER_CHUNK; 759bf9529f8SMarc Zyngier 760bf9529f8SMarc Zyngier out: 761bf9529f8SMarc Zyngier spin_unlock(&lpi_lock); 762bf9529f8SMarc Zyngier 763c8415b94SMarc Zyngier if (!bitmap) 764c8415b94SMarc Zyngier *base = *nr_ids = 0; 765c8415b94SMarc Zyngier 766bf9529f8SMarc Zyngier return bitmap; 767bf9529f8SMarc Zyngier } 768bf9529f8SMarc Zyngier 769591e5becSMarc Zyngier static void its_lpi_free(struct event_lpi_map *map) 770bf9529f8SMarc Zyngier { 771591e5becSMarc Zyngier int base = map->lpi_base; 772591e5becSMarc Zyngier int nr_ids = map->nr_lpis; 773bf9529f8SMarc Zyngier int lpi; 774bf9529f8SMarc Zyngier 775bf9529f8SMarc Zyngier spin_lock(&lpi_lock); 776bf9529f8SMarc Zyngier 777bf9529f8SMarc Zyngier for (lpi = base; lpi < (base + nr_ids); lpi += IRQS_PER_CHUNK) { 778bf9529f8SMarc Zyngier int chunk = its_lpi_to_chunk(lpi); 779bf9529f8SMarc Zyngier BUG_ON(chunk > lpi_chunks); 780bf9529f8SMarc Zyngier if (test_bit(chunk, lpi_bitmap)) { 781bf9529f8SMarc Zyngier clear_bit(chunk, lpi_bitmap); 782bf9529f8SMarc Zyngier } else { 783bf9529f8SMarc Zyngier pr_err("Bad LPI chunk %d\n", chunk); 784bf9529f8SMarc Zyngier } 785bf9529f8SMarc Zyngier } 786bf9529f8SMarc Zyngier 787bf9529f8SMarc Zyngier spin_unlock(&lpi_lock); 788bf9529f8SMarc Zyngier 789591e5becSMarc Zyngier kfree(map->lpi_map); 790591e5becSMarc Zyngier kfree(map->col_map); 791bf9529f8SMarc Zyngier } 7921ac19ca6SMarc Zyngier 7931ac19ca6SMarc Zyngier /* 7946c31e123SShanker Donthineni * We allocate memory for PROPBASE to cover 2 ^ lpi_id_bits LPIs to 7951ac19ca6SMarc Zyngier * deal with (one configuration byte per interrupt). PENDBASE has to 7961ac19ca6SMarc Zyngier * be 64kB aligned (one bit per LPI, plus 8192 bits for SPI/PPI/SGI). 7971ac19ca6SMarc Zyngier */ 7986c31e123SShanker Donthineni #define LPI_NRBITS lpi_id_bits 7996c31e123SShanker Donthineni #define LPI_PROPBASE_SZ ALIGN(BIT(LPI_NRBITS), SZ_64K) 8006c31e123SShanker Donthineni #define LPI_PENDBASE_SZ ALIGN(BIT(LPI_NRBITS) / 8, SZ_64K) 8011ac19ca6SMarc Zyngier 8021ac19ca6SMarc Zyngier #define LPI_PROP_DEFAULT_PRIO 0xa0 8031ac19ca6SMarc Zyngier 8041ac19ca6SMarc Zyngier static int __init its_alloc_lpi_tables(void) 8051ac19ca6SMarc Zyngier { 8061ac19ca6SMarc Zyngier phys_addr_t paddr; 8071ac19ca6SMarc Zyngier 8086c31e123SShanker Donthineni lpi_id_bits = min_t(u32, gic_rdists->id_bits, ITS_MAX_LPI_NRBITS); 8091ac19ca6SMarc Zyngier gic_rdists->prop_page = alloc_pages(GFP_NOWAIT, 8101ac19ca6SMarc Zyngier get_order(LPI_PROPBASE_SZ)); 8111ac19ca6SMarc Zyngier if (!gic_rdists->prop_page) { 8121ac19ca6SMarc Zyngier pr_err("Failed to allocate PROPBASE\n"); 8131ac19ca6SMarc Zyngier return -ENOMEM; 8141ac19ca6SMarc Zyngier } 8151ac19ca6SMarc Zyngier 8161ac19ca6SMarc Zyngier paddr = page_to_phys(gic_rdists->prop_page); 8171ac19ca6SMarc Zyngier pr_info("GIC: using LPI property table @%pa\n", &paddr); 8181ac19ca6SMarc Zyngier 8191ac19ca6SMarc Zyngier /* Priority 0xa0, Group-1, disabled */ 8201ac19ca6SMarc Zyngier memset(page_address(gic_rdists->prop_page), 8211ac19ca6SMarc Zyngier LPI_PROP_DEFAULT_PRIO | LPI_PROP_GROUP1, 8221ac19ca6SMarc Zyngier LPI_PROPBASE_SZ); 8231ac19ca6SMarc Zyngier 8241ac19ca6SMarc Zyngier /* Make sure the GIC will observe the written configuration */ 825328191c0SVladimir Murzin gic_flush_dcache_to_poc(page_address(gic_rdists->prop_page), LPI_PROPBASE_SZ); 8261ac19ca6SMarc Zyngier 8276c31e123SShanker Donthineni return its_lpi_init(lpi_id_bits); 8281ac19ca6SMarc Zyngier } 8291ac19ca6SMarc Zyngier 8301ac19ca6SMarc Zyngier static const char *its_base_type_string[] = { 8311ac19ca6SMarc Zyngier [GITS_BASER_TYPE_DEVICE] = "Devices", 8321ac19ca6SMarc Zyngier [GITS_BASER_TYPE_VCPU] = "Virtual CPUs", 8334f46de9dSMarc Zyngier [GITS_BASER_TYPE_RESERVED3] = "Reserved (3)", 8341ac19ca6SMarc Zyngier [GITS_BASER_TYPE_COLLECTION] = "Interrupt Collections", 8351ac19ca6SMarc Zyngier [GITS_BASER_TYPE_RESERVED5] = "Reserved (5)", 8361ac19ca6SMarc Zyngier [GITS_BASER_TYPE_RESERVED6] = "Reserved (6)", 8371ac19ca6SMarc Zyngier [GITS_BASER_TYPE_RESERVED7] = "Reserved (7)", 8381ac19ca6SMarc Zyngier }; 8391ac19ca6SMarc Zyngier 8402d81d425SShanker Donthineni static u64 its_read_baser(struct its_node *its, struct its_baser *baser) 8412d81d425SShanker Donthineni { 8422d81d425SShanker Donthineni u32 idx = baser - its->tables; 8432d81d425SShanker Donthineni 8440968a619SVladimir Murzin return gits_read_baser(its->base + GITS_BASER + (idx << 3)); 8452d81d425SShanker Donthineni } 8462d81d425SShanker Donthineni 8472d81d425SShanker Donthineni static void its_write_baser(struct its_node *its, struct its_baser *baser, 8482d81d425SShanker Donthineni u64 val) 8492d81d425SShanker Donthineni { 8502d81d425SShanker Donthineni u32 idx = baser - its->tables; 8512d81d425SShanker Donthineni 8520968a619SVladimir Murzin gits_write_baser(val, its->base + GITS_BASER + (idx << 3)); 8532d81d425SShanker Donthineni baser->val = its_read_baser(its, baser); 8542d81d425SShanker Donthineni } 8552d81d425SShanker Donthineni 8569347359aSShanker Donthineni static int its_setup_baser(struct its_node *its, struct its_baser *baser, 8573faf24eaSShanker Donthineni u64 cache, u64 shr, u32 psz, u32 order, 8583faf24eaSShanker Donthineni bool indirect) 8599347359aSShanker Donthineni { 8609347359aSShanker Donthineni u64 val = its_read_baser(its, baser); 8619347359aSShanker Donthineni u64 esz = GITS_BASER_ENTRY_SIZE(val); 8629347359aSShanker Donthineni u64 type = GITS_BASER_TYPE(val); 8639347359aSShanker Donthineni u32 alloc_pages; 8649347359aSShanker Donthineni void *base; 8659347359aSShanker Donthineni u64 tmp; 8669347359aSShanker Donthineni 8679347359aSShanker Donthineni retry_alloc_baser: 8689347359aSShanker Donthineni alloc_pages = (PAGE_ORDER_TO_SIZE(order) / psz); 8699347359aSShanker Donthineni if (alloc_pages > GITS_BASER_PAGES_MAX) { 8709347359aSShanker Donthineni pr_warn("ITS@%pa: %s too large, reduce ITS pages %u->%u\n", 8719347359aSShanker Donthineni &its->phys_base, its_base_type_string[type], 8729347359aSShanker Donthineni alloc_pages, GITS_BASER_PAGES_MAX); 8739347359aSShanker Donthineni alloc_pages = GITS_BASER_PAGES_MAX; 8749347359aSShanker Donthineni order = get_order(GITS_BASER_PAGES_MAX * psz); 8759347359aSShanker Donthineni } 8769347359aSShanker Donthineni 8779347359aSShanker Donthineni base = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, order); 8789347359aSShanker Donthineni if (!base) 8799347359aSShanker Donthineni return -ENOMEM; 8809347359aSShanker Donthineni 8819347359aSShanker Donthineni retry_baser: 8829347359aSShanker Donthineni val = (virt_to_phys(base) | 8839347359aSShanker Donthineni (type << GITS_BASER_TYPE_SHIFT) | 8849347359aSShanker Donthineni ((esz - 1) << GITS_BASER_ENTRY_SIZE_SHIFT) | 8859347359aSShanker Donthineni ((alloc_pages - 1) << GITS_BASER_PAGES_SHIFT) | 8869347359aSShanker Donthineni cache | 8879347359aSShanker Donthineni shr | 8889347359aSShanker Donthineni GITS_BASER_VALID); 8899347359aSShanker Donthineni 8903faf24eaSShanker Donthineni val |= indirect ? GITS_BASER_INDIRECT : 0x0; 8913faf24eaSShanker Donthineni 8929347359aSShanker Donthineni switch (psz) { 8939347359aSShanker Donthineni case SZ_4K: 8949347359aSShanker Donthineni val |= GITS_BASER_PAGE_SIZE_4K; 8959347359aSShanker Donthineni break; 8969347359aSShanker Donthineni case SZ_16K: 8979347359aSShanker Donthineni val |= GITS_BASER_PAGE_SIZE_16K; 8989347359aSShanker Donthineni break; 8999347359aSShanker Donthineni case SZ_64K: 9009347359aSShanker Donthineni val |= GITS_BASER_PAGE_SIZE_64K; 9019347359aSShanker Donthineni break; 9029347359aSShanker Donthineni } 9039347359aSShanker Donthineni 9049347359aSShanker Donthineni its_write_baser(its, baser, val); 9059347359aSShanker Donthineni tmp = baser->val; 9069347359aSShanker Donthineni 9079347359aSShanker Donthineni if ((val ^ tmp) & GITS_BASER_SHAREABILITY_MASK) { 9089347359aSShanker Donthineni /* 9099347359aSShanker Donthineni * Shareability didn't stick. Just use 9109347359aSShanker Donthineni * whatever the read reported, which is likely 9119347359aSShanker Donthineni * to be the only thing this redistributor 9129347359aSShanker Donthineni * supports. If that's zero, make it 9139347359aSShanker Donthineni * non-cacheable as well. 9149347359aSShanker Donthineni */ 9159347359aSShanker Donthineni shr = tmp & GITS_BASER_SHAREABILITY_MASK; 9169347359aSShanker Donthineni if (!shr) { 9179347359aSShanker Donthineni cache = GITS_BASER_nC; 918328191c0SVladimir Murzin gic_flush_dcache_to_poc(base, PAGE_ORDER_TO_SIZE(order)); 9199347359aSShanker Donthineni } 9209347359aSShanker Donthineni goto retry_baser; 9219347359aSShanker Donthineni } 9229347359aSShanker Donthineni 9239347359aSShanker Donthineni if ((val ^ tmp) & GITS_BASER_PAGE_SIZE_MASK) { 9249347359aSShanker Donthineni /* 9259347359aSShanker Donthineni * Page size didn't stick. Let's try a smaller 9269347359aSShanker Donthineni * size and retry. If we reach 4K, then 9279347359aSShanker Donthineni * something is horribly wrong... 9289347359aSShanker Donthineni */ 9299347359aSShanker Donthineni free_pages((unsigned long)base, order); 9309347359aSShanker Donthineni baser->base = NULL; 9319347359aSShanker Donthineni 9329347359aSShanker Donthineni switch (psz) { 9339347359aSShanker Donthineni case SZ_16K: 9349347359aSShanker Donthineni psz = SZ_4K; 9359347359aSShanker Donthineni goto retry_alloc_baser; 9369347359aSShanker Donthineni case SZ_64K: 9379347359aSShanker Donthineni psz = SZ_16K; 9389347359aSShanker Donthineni goto retry_alloc_baser; 9399347359aSShanker Donthineni } 9409347359aSShanker Donthineni } 9419347359aSShanker Donthineni 9429347359aSShanker Donthineni if (val != tmp) { 943b11283ebSVladimir Murzin pr_err("ITS@%pa: %s doesn't stick: %llx %llx\n", 9449347359aSShanker Donthineni &its->phys_base, its_base_type_string[type], 945b11283ebSVladimir Murzin val, tmp); 9469347359aSShanker Donthineni free_pages((unsigned long)base, order); 9479347359aSShanker Donthineni return -ENXIO; 9489347359aSShanker Donthineni } 9499347359aSShanker Donthineni 9509347359aSShanker Donthineni baser->order = order; 9519347359aSShanker Donthineni baser->base = base; 9529347359aSShanker Donthineni baser->psz = psz; 9533faf24eaSShanker Donthineni tmp = indirect ? GITS_LVL1_ENTRY_SIZE : esz; 9549347359aSShanker Donthineni 9553faf24eaSShanker Donthineni pr_info("ITS@%pa: allocated %d %s @%lx (%s, esz %d, psz %dK, shr %d)\n", 956d524eaa2SVladimir Murzin &its->phys_base, (int)(PAGE_ORDER_TO_SIZE(order) / (int)tmp), 9579347359aSShanker Donthineni its_base_type_string[type], 9589347359aSShanker Donthineni (unsigned long)virt_to_phys(base), 9593faf24eaSShanker Donthineni indirect ? "indirect" : "flat", (int)esz, 9609347359aSShanker Donthineni psz / SZ_1K, (int)shr >> GITS_BASER_SHAREABILITY_SHIFT); 9619347359aSShanker Donthineni 9629347359aSShanker Donthineni return 0; 9639347359aSShanker Donthineni } 9649347359aSShanker Donthineni 9653faf24eaSShanker Donthineni static bool its_parse_baser_device(struct its_node *its, struct its_baser *baser, 9663faf24eaSShanker Donthineni u32 psz, u32 *order) 9674b75c459SShanker Donthineni { 9684b75c459SShanker Donthineni u64 esz = GITS_BASER_ENTRY_SIZE(its_read_baser(its, baser)); 9692fd632a0SShanker Donthineni u64 val = GITS_BASER_InnerShareable | GITS_BASER_RaWaWb; 9704b75c459SShanker Donthineni u32 ids = its->device_ids; 9714b75c459SShanker Donthineni u32 new_order = *order; 9723faf24eaSShanker Donthineni bool indirect = false; 9733faf24eaSShanker Donthineni 9743faf24eaSShanker Donthineni /* No need to enable Indirection if memory requirement < (psz*2)bytes */ 9753faf24eaSShanker Donthineni if ((esz << ids) > (psz * 2)) { 9763faf24eaSShanker Donthineni /* 9773faf24eaSShanker Donthineni * Find out whether hw supports a single or two-level table by 9783faf24eaSShanker Donthineni * table by reading bit at offset '62' after writing '1' to it. 9793faf24eaSShanker Donthineni */ 9803faf24eaSShanker Donthineni its_write_baser(its, baser, val | GITS_BASER_INDIRECT); 9813faf24eaSShanker Donthineni indirect = !!(baser->val & GITS_BASER_INDIRECT); 9823faf24eaSShanker Donthineni 9833faf24eaSShanker Donthineni if (indirect) { 9843faf24eaSShanker Donthineni /* 9853faf24eaSShanker Donthineni * The size of the lvl2 table is equal to ITS page size 9863faf24eaSShanker Donthineni * which is 'psz'. For computing lvl1 table size, 9873faf24eaSShanker Donthineni * subtract ID bits that sparse lvl2 table from 'ids' 9883faf24eaSShanker Donthineni * which is reported by ITS hardware times lvl1 table 9893faf24eaSShanker Donthineni * entry size. 9903faf24eaSShanker Donthineni */ 991d524eaa2SVladimir Murzin ids -= ilog2(psz / (int)esz); 9923faf24eaSShanker Donthineni esz = GITS_LVL1_ENTRY_SIZE; 9933faf24eaSShanker Donthineni } 9943faf24eaSShanker Donthineni } 9954b75c459SShanker Donthineni 9964b75c459SShanker Donthineni /* 9974b75c459SShanker Donthineni * Allocate as many entries as required to fit the 9984b75c459SShanker Donthineni * range of device IDs that the ITS can grok... The ID 9994b75c459SShanker Donthineni * space being incredibly sparse, this results in a 10003faf24eaSShanker Donthineni * massive waste of memory if two-level device table 10013faf24eaSShanker Donthineni * feature is not supported by hardware. 10024b75c459SShanker Donthineni */ 10034b75c459SShanker Donthineni new_order = max_t(u32, get_order(esz << ids), new_order); 10044b75c459SShanker Donthineni if (new_order >= MAX_ORDER) { 10054b75c459SShanker Donthineni new_order = MAX_ORDER - 1; 1006d524eaa2SVladimir Murzin ids = ilog2(PAGE_ORDER_TO_SIZE(new_order) / (int)esz); 10074b75c459SShanker Donthineni pr_warn("ITS@%pa: Device Table too large, reduce ids %u->%u\n", 10084b75c459SShanker Donthineni &its->phys_base, its->device_ids, ids); 10094b75c459SShanker Donthineni } 10104b75c459SShanker Donthineni 10114b75c459SShanker Donthineni *order = new_order; 10123faf24eaSShanker Donthineni 10133faf24eaSShanker Donthineni return indirect; 10144b75c459SShanker Donthineni } 10154b75c459SShanker Donthineni 10161ac19ca6SMarc Zyngier static void its_free_tables(struct its_node *its) 10171ac19ca6SMarc Zyngier { 10181ac19ca6SMarc Zyngier int i; 10191ac19ca6SMarc Zyngier 10201ac19ca6SMarc Zyngier for (i = 0; i < GITS_BASER_NR_REGS; i++) { 10211a485f4dSShanker Donthineni if (its->tables[i].base) { 10221a485f4dSShanker Donthineni free_pages((unsigned long)its->tables[i].base, 10231a485f4dSShanker Donthineni its->tables[i].order); 10241a485f4dSShanker Donthineni its->tables[i].base = NULL; 10251ac19ca6SMarc Zyngier } 10261ac19ca6SMarc Zyngier } 10271ac19ca6SMarc Zyngier } 10281ac19ca6SMarc Zyngier 10290e0b0f69SShanker Donthineni static int its_alloc_tables(struct its_node *its) 10301ac19ca6SMarc Zyngier { 1031589ce5f4SMarc Zyngier u64 typer = gic_read_typer(its->base + GITS_TYPER); 10329347359aSShanker Donthineni u32 ids = GITS_TYPER_DEVBITS(typer); 10331ac19ca6SMarc Zyngier u64 shr = GITS_BASER_InnerShareable; 10342fd632a0SShanker Donthineni u64 cache = GITS_BASER_RaWaWb; 10359347359aSShanker Donthineni u32 psz = SZ_64K; 10369347359aSShanker Donthineni int err, i; 103794100970SRobert Richter 103894100970SRobert Richter if (its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_22375) { 103994100970SRobert Richter /* 104094100970SRobert Richter * erratum 22375: only alloc 8MB table size 104194100970SRobert Richter * erratum 24313: ignore memory access type 104294100970SRobert Richter */ 10439347359aSShanker Donthineni cache = GITS_BASER_nCnB; 104494100970SRobert Richter ids = 0x14; /* 20 bits, 8MB */ 104594100970SRobert Richter } 10461ac19ca6SMarc Zyngier 1047466b7d16SShanker Donthineni its->device_ids = ids; 1048466b7d16SShanker Donthineni 10491ac19ca6SMarc Zyngier for (i = 0; i < GITS_BASER_NR_REGS; i++) { 10502d81d425SShanker Donthineni struct its_baser *baser = its->tables + i; 10512d81d425SShanker Donthineni u64 val = its_read_baser(its, baser); 10521ac19ca6SMarc Zyngier u64 type = GITS_BASER_TYPE(val); 10539347359aSShanker Donthineni u32 order = get_order(psz); 10543faf24eaSShanker Donthineni bool indirect = false; 10551ac19ca6SMarc Zyngier 10561ac19ca6SMarc Zyngier if (type == GITS_BASER_TYPE_NONE) 10571ac19ca6SMarc Zyngier continue; 10581ac19ca6SMarc Zyngier 10594b75c459SShanker Donthineni if (type == GITS_BASER_TYPE_DEVICE) 10603faf24eaSShanker Donthineni indirect = its_parse_baser_device(its, baser, psz, &order); 1061f54b97edSMarc Zyngier 10623faf24eaSShanker Donthineni err = its_setup_baser(its, baser, cache, shr, psz, order, indirect); 10639347359aSShanker Donthineni if (err < 0) { 10649347359aSShanker Donthineni its_free_tables(its); 10659347359aSShanker Donthineni return err; 106630f21363SRobert Richter } 106730f21363SRobert Richter 10689347359aSShanker Donthineni /* Update settings which will be used for next BASERn */ 10699347359aSShanker Donthineni psz = baser->psz; 10709347359aSShanker Donthineni cache = baser->val & GITS_BASER_CACHEABILITY_MASK; 10719347359aSShanker Donthineni shr = baser->val & GITS_BASER_SHAREABILITY_MASK; 10721ac19ca6SMarc Zyngier } 10731ac19ca6SMarc Zyngier 10741ac19ca6SMarc Zyngier return 0; 10751ac19ca6SMarc Zyngier } 10761ac19ca6SMarc Zyngier 10771ac19ca6SMarc Zyngier static int its_alloc_collections(struct its_node *its) 10781ac19ca6SMarc Zyngier { 10791ac19ca6SMarc Zyngier its->collections = kzalloc(nr_cpu_ids * sizeof(*its->collections), 10801ac19ca6SMarc Zyngier GFP_KERNEL); 10811ac19ca6SMarc Zyngier if (!its->collections) 10821ac19ca6SMarc Zyngier return -ENOMEM; 10831ac19ca6SMarc Zyngier 10841ac19ca6SMarc Zyngier return 0; 10851ac19ca6SMarc Zyngier } 10861ac19ca6SMarc Zyngier 10871ac19ca6SMarc Zyngier static void its_cpu_init_lpis(void) 10881ac19ca6SMarc Zyngier { 10891ac19ca6SMarc Zyngier void __iomem *rbase = gic_data_rdist_rd_base(); 10901ac19ca6SMarc Zyngier struct page *pend_page; 10911ac19ca6SMarc Zyngier u64 val, tmp; 10921ac19ca6SMarc Zyngier 10931ac19ca6SMarc Zyngier /* If we didn't allocate the pending table yet, do it now */ 10941ac19ca6SMarc Zyngier pend_page = gic_data_rdist()->pend_page; 10951ac19ca6SMarc Zyngier if (!pend_page) { 10961ac19ca6SMarc Zyngier phys_addr_t paddr; 10971ac19ca6SMarc Zyngier /* 10981ac19ca6SMarc Zyngier * The pending pages have to be at least 64kB aligned, 10991ac19ca6SMarc Zyngier * hence the 'max(LPI_PENDBASE_SZ, SZ_64K)' below. 11001ac19ca6SMarc Zyngier */ 11011ac19ca6SMarc Zyngier pend_page = alloc_pages(GFP_NOWAIT | __GFP_ZERO, 11026c31e123SShanker Donthineni get_order(max_t(u32, LPI_PENDBASE_SZ, SZ_64K))); 11031ac19ca6SMarc Zyngier if (!pend_page) { 11041ac19ca6SMarc Zyngier pr_err("Failed to allocate PENDBASE for CPU%d\n", 11051ac19ca6SMarc Zyngier smp_processor_id()); 11061ac19ca6SMarc Zyngier return; 11071ac19ca6SMarc Zyngier } 11081ac19ca6SMarc Zyngier 11091ac19ca6SMarc Zyngier /* Make sure the GIC will observe the zero-ed page */ 1110328191c0SVladimir Murzin gic_flush_dcache_to_poc(page_address(pend_page), LPI_PENDBASE_SZ); 11111ac19ca6SMarc Zyngier 11121ac19ca6SMarc Zyngier paddr = page_to_phys(pend_page); 11131ac19ca6SMarc Zyngier pr_info("CPU%d: using LPI pending table @%pa\n", 11141ac19ca6SMarc Zyngier smp_processor_id(), &paddr); 11151ac19ca6SMarc Zyngier gic_data_rdist()->pend_page = pend_page; 11161ac19ca6SMarc Zyngier } 11171ac19ca6SMarc Zyngier 11181ac19ca6SMarc Zyngier /* Disable LPIs */ 11191ac19ca6SMarc Zyngier val = readl_relaxed(rbase + GICR_CTLR); 11201ac19ca6SMarc Zyngier val &= ~GICR_CTLR_ENABLE_LPIS; 11211ac19ca6SMarc Zyngier writel_relaxed(val, rbase + GICR_CTLR); 11221ac19ca6SMarc Zyngier 11231ac19ca6SMarc Zyngier /* 11241ac19ca6SMarc Zyngier * Make sure any change to the table is observable by the GIC. 11251ac19ca6SMarc Zyngier */ 11261ac19ca6SMarc Zyngier dsb(sy); 11271ac19ca6SMarc Zyngier 11281ac19ca6SMarc Zyngier /* set PROPBASE */ 11291ac19ca6SMarc Zyngier val = (page_to_phys(gic_rdists->prop_page) | 11301ac19ca6SMarc Zyngier GICR_PROPBASER_InnerShareable | 11312fd632a0SShanker Donthineni GICR_PROPBASER_RaWaWb | 11321ac19ca6SMarc Zyngier ((LPI_NRBITS - 1) & GICR_PROPBASER_IDBITS_MASK)); 11331ac19ca6SMarc Zyngier 11340968a619SVladimir Murzin gicr_write_propbaser(val, rbase + GICR_PROPBASER); 11350968a619SVladimir Murzin tmp = gicr_read_propbaser(rbase + GICR_PROPBASER); 11361ac19ca6SMarc Zyngier 11371ac19ca6SMarc Zyngier if ((tmp ^ val) & GICR_PROPBASER_SHAREABILITY_MASK) { 1138241a386cSMarc Zyngier if (!(tmp & GICR_PROPBASER_SHAREABILITY_MASK)) { 1139241a386cSMarc Zyngier /* 1140241a386cSMarc Zyngier * The HW reports non-shareable, we must 1141241a386cSMarc Zyngier * remove the cacheability attributes as 1142241a386cSMarc Zyngier * well. 1143241a386cSMarc Zyngier */ 1144241a386cSMarc Zyngier val &= ~(GICR_PROPBASER_SHAREABILITY_MASK | 1145241a386cSMarc Zyngier GICR_PROPBASER_CACHEABILITY_MASK); 1146241a386cSMarc Zyngier val |= GICR_PROPBASER_nC; 11470968a619SVladimir Murzin gicr_write_propbaser(val, rbase + GICR_PROPBASER); 1148241a386cSMarc Zyngier } 11491ac19ca6SMarc Zyngier pr_info_once("GIC: using cache flushing for LPI property table\n"); 11501ac19ca6SMarc Zyngier gic_rdists->flags |= RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING; 11511ac19ca6SMarc Zyngier } 11521ac19ca6SMarc Zyngier 11531ac19ca6SMarc Zyngier /* set PENDBASE */ 11541ac19ca6SMarc Zyngier val = (page_to_phys(pend_page) | 11554ad3e363SMarc Zyngier GICR_PENDBASER_InnerShareable | 11562fd632a0SShanker Donthineni GICR_PENDBASER_RaWaWb); 11571ac19ca6SMarc Zyngier 11580968a619SVladimir Murzin gicr_write_pendbaser(val, rbase + GICR_PENDBASER); 11590968a619SVladimir Murzin tmp = gicr_read_pendbaser(rbase + GICR_PENDBASER); 1160241a386cSMarc Zyngier 1161241a386cSMarc Zyngier if (!(tmp & GICR_PENDBASER_SHAREABILITY_MASK)) { 1162241a386cSMarc Zyngier /* 1163241a386cSMarc Zyngier * The HW reports non-shareable, we must remove the 1164241a386cSMarc Zyngier * cacheability attributes as well. 1165241a386cSMarc Zyngier */ 1166241a386cSMarc Zyngier val &= ~(GICR_PENDBASER_SHAREABILITY_MASK | 1167241a386cSMarc Zyngier GICR_PENDBASER_CACHEABILITY_MASK); 1168241a386cSMarc Zyngier val |= GICR_PENDBASER_nC; 11690968a619SVladimir Murzin gicr_write_pendbaser(val, rbase + GICR_PENDBASER); 1170241a386cSMarc Zyngier } 11711ac19ca6SMarc Zyngier 11721ac19ca6SMarc Zyngier /* Enable LPIs */ 11731ac19ca6SMarc Zyngier val = readl_relaxed(rbase + GICR_CTLR); 11741ac19ca6SMarc Zyngier val |= GICR_CTLR_ENABLE_LPIS; 11751ac19ca6SMarc Zyngier writel_relaxed(val, rbase + GICR_CTLR); 11761ac19ca6SMarc Zyngier 11771ac19ca6SMarc Zyngier /* Make sure the GIC has seen the above */ 11781ac19ca6SMarc Zyngier dsb(sy); 11791ac19ca6SMarc Zyngier } 11801ac19ca6SMarc Zyngier 11811ac19ca6SMarc Zyngier static void its_cpu_init_collection(void) 11821ac19ca6SMarc Zyngier { 11831ac19ca6SMarc Zyngier struct its_node *its; 11841ac19ca6SMarc Zyngier int cpu; 11851ac19ca6SMarc Zyngier 11861ac19ca6SMarc Zyngier spin_lock(&its_lock); 11871ac19ca6SMarc Zyngier cpu = smp_processor_id(); 11881ac19ca6SMarc Zyngier 11891ac19ca6SMarc Zyngier list_for_each_entry(its, &its_nodes, entry) { 11901ac19ca6SMarc Zyngier u64 target; 11911ac19ca6SMarc Zyngier 1192fbf8f40eSGanapatrao Kulkarni /* avoid cross node collections and its mapping */ 1193fbf8f40eSGanapatrao Kulkarni if (its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_23144) { 1194fbf8f40eSGanapatrao Kulkarni struct device_node *cpu_node; 1195fbf8f40eSGanapatrao Kulkarni 1196fbf8f40eSGanapatrao Kulkarni cpu_node = of_get_cpu_node(cpu, NULL); 1197fbf8f40eSGanapatrao Kulkarni if (its->numa_node != NUMA_NO_NODE && 1198fbf8f40eSGanapatrao Kulkarni its->numa_node != of_node_to_nid(cpu_node)) 1199fbf8f40eSGanapatrao Kulkarni continue; 1200fbf8f40eSGanapatrao Kulkarni } 1201fbf8f40eSGanapatrao Kulkarni 12021ac19ca6SMarc Zyngier /* 12031ac19ca6SMarc Zyngier * We now have to bind each collection to its target 12041ac19ca6SMarc Zyngier * redistributor. 12051ac19ca6SMarc Zyngier */ 1206589ce5f4SMarc Zyngier if (gic_read_typer(its->base + GITS_TYPER) & GITS_TYPER_PTA) { 12071ac19ca6SMarc Zyngier /* 12081ac19ca6SMarc Zyngier * This ITS wants the physical address of the 12091ac19ca6SMarc Zyngier * redistributor. 12101ac19ca6SMarc Zyngier */ 12111ac19ca6SMarc Zyngier target = gic_data_rdist()->phys_base; 12121ac19ca6SMarc Zyngier } else { 12131ac19ca6SMarc Zyngier /* 12141ac19ca6SMarc Zyngier * This ITS wants a linear CPU number. 12151ac19ca6SMarc Zyngier */ 1216589ce5f4SMarc Zyngier target = gic_read_typer(gic_data_rdist_rd_base() + GICR_TYPER); 1217263fcd31SMarc Zyngier target = GICR_TYPER_CPU_NUMBER(target) << 16; 12181ac19ca6SMarc Zyngier } 12191ac19ca6SMarc Zyngier 12201ac19ca6SMarc Zyngier /* Perform collection mapping */ 12211ac19ca6SMarc Zyngier its->collections[cpu].target_address = target; 12221ac19ca6SMarc Zyngier its->collections[cpu].col_id = cpu; 12231ac19ca6SMarc Zyngier 12241ac19ca6SMarc Zyngier its_send_mapc(its, &its->collections[cpu], 1); 12251ac19ca6SMarc Zyngier its_send_invall(its, &its->collections[cpu]); 12261ac19ca6SMarc Zyngier } 12271ac19ca6SMarc Zyngier 12281ac19ca6SMarc Zyngier spin_unlock(&its_lock); 12291ac19ca6SMarc Zyngier } 123084a6a2e7SMarc Zyngier 123184a6a2e7SMarc Zyngier static struct its_device *its_find_device(struct its_node *its, u32 dev_id) 123284a6a2e7SMarc Zyngier { 123384a6a2e7SMarc Zyngier struct its_device *its_dev = NULL, *tmp; 12343e39e8f5SMarc Zyngier unsigned long flags; 123584a6a2e7SMarc Zyngier 12363e39e8f5SMarc Zyngier raw_spin_lock_irqsave(&its->lock, flags); 123784a6a2e7SMarc Zyngier 123884a6a2e7SMarc Zyngier list_for_each_entry(tmp, &its->its_device_list, entry) { 123984a6a2e7SMarc Zyngier if (tmp->device_id == dev_id) { 124084a6a2e7SMarc Zyngier its_dev = tmp; 124184a6a2e7SMarc Zyngier break; 124284a6a2e7SMarc Zyngier } 124384a6a2e7SMarc Zyngier } 124484a6a2e7SMarc Zyngier 12453e39e8f5SMarc Zyngier raw_spin_unlock_irqrestore(&its->lock, flags); 124684a6a2e7SMarc Zyngier 124784a6a2e7SMarc Zyngier return its_dev; 124884a6a2e7SMarc Zyngier } 124984a6a2e7SMarc Zyngier 1250466b7d16SShanker Donthineni static struct its_baser *its_get_baser(struct its_node *its, u32 type) 1251466b7d16SShanker Donthineni { 1252466b7d16SShanker Donthineni int i; 1253466b7d16SShanker Donthineni 1254466b7d16SShanker Donthineni for (i = 0; i < GITS_BASER_NR_REGS; i++) { 1255466b7d16SShanker Donthineni if (GITS_BASER_TYPE(its->tables[i].val) == type) 1256466b7d16SShanker Donthineni return &its->tables[i]; 1257466b7d16SShanker Donthineni } 1258466b7d16SShanker Donthineni 1259466b7d16SShanker Donthineni return NULL; 1260466b7d16SShanker Donthineni } 1261466b7d16SShanker Donthineni 12623faf24eaSShanker Donthineni static bool its_alloc_device_table(struct its_node *its, u32 dev_id) 12633faf24eaSShanker Donthineni { 12643faf24eaSShanker Donthineni struct its_baser *baser; 12653faf24eaSShanker Donthineni struct page *page; 12663faf24eaSShanker Donthineni u32 esz, idx; 12673faf24eaSShanker Donthineni __le64 *table; 12683faf24eaSShanker Donthineni 12693faf24eaSShanker Donthineni baser = its_get_baser(its, GITS_BASER_TYPE_DEVICE); 12703faf24eaSShanker Donthineni 12713faf24eaSShanker Donthineni /* Don't allow device id that exceeds ITS hardware limit */ 12723faf24eaSShanker Donthineni if (!baser) 12733faf24eaSShanker Donthineni return (ilog2(dev_id) < its->device_ids); 12743faf24eaSShanker Donthineni 12753faf24eaSShanker Donthineni /* Don't allow device id that exceeds single, flat table limit */ 12763faf24eaSShanker Donthineni esz = GITS_BASER_ENTRY_SIZE(baser->val); 12773faf24eaSShanker Donthineni if (!(baser->val & GITS_BASER_INDIRECT)) 12783faf24eaSShanker Donthineni return (dev_id < (PAGE_ORDER_TO_SIZE(baser->order) / esz)); 12793faf24eaSShanker Donthineni 12803faf24eaSShanker Donthineni /* Compute 1st level table index & check if that exceeds table limit */ 12813faf24eaSShanker Donthineni idx = dev_id >> ilog2(baser->psz / esz); 12823faf24eaSShanker Donthineni if (idx >= (PAGE_ORDER_TO_SIZE(baser->order) / GITS_LVL1_ENTRY_SIZE)) 12833faf24eaSShanker Donthineni return false; 12843faf24eaSShanker Donthineni 12853faf24eaSShanker Donthineni table = baser->base; 12863faf24eaSShanker Donthineni 12873faf24eaSShanker Donthineni /* Allocate memory for 2nd level table */ 12883faf24eaSShanker Donthineni if (!table[idx]) { 12893faf24eaSShanker Donthineni page = alloc_pages(GFP_KERNEL | __GFP_ZERO, get_order(baser->psz)); 12903faf24eaSShanker Donthineni if (!page) 12913faf24eaSShanker Donthineni return false; 12923faf24eaSShanker Donthineni 12933faf24eaSShanker Donthineni /* Flush Lvl2 table to PoC if hw doesn't support coherency */ 12943faf24eaSShanker Donthineni if (!(baser->val & GITS_BASER_SHAREABILITY_MASK)) 1295328191c0SVladimir Murzin gic_flush_dcache_to_poc(page_address(page), baser->psz); 12963faf24eaSShanker Donthineni 12973faf24eaSShanker Donthineni table[idx] = cpu_to_le64(page_to_phys(page) | GITS_BASER_VALID); 12983faf24eaSShanker Donthineni 12993faf24eaSShanker Donthineni /* Flush Lvl1 entry to PoC if hw doesn't support coherency */ 13003faf24eaSShanker Donthineni if (!(baser->val & GITS_BASER_SHAREABILITY_MASK)) 1301328191c0SVladimir Murzin gic_flush_dcache_to_poc(table + idx, GITS_LVL1_ENTRY_SIZE); 13023faf24eaSShanker Donthineni 13033faf24eaSShanker Donthineni /* Ensure updated table contents are visible to ITS hardware */ 13043faf24eaSShanker Donthineni dsb(sy); 13053faf24eaSShanker Donthineni } 13063faf24eaSShanker Donthineni 13073faf24eaSShanker Donthineni return true; 13083faf24eaSShanker Donthineni } 13093faf24eaSShanker Donthineni 131084a6a2e7SMarc Zyngier static struct its_device *its_create_device(struct its_node *its, u32 dev_id, 131184a6a2e7SMarc Zyngier int nvecs) 131284a6a2e7SMarc Zyngier { 131384a6a2e7SMarc Zyngier struct its_device *dev; 131484a6a2e7SMarc Zyngier unsigned long *lpi_map; 13153e39e8f5SMarc Zyngier unsigned long flags; 1316591e5becSMarc Zyngier u16 *col_map = NULL; 131784a6a2e7SMarc Zyngier void *itt; 131884a6a2e7SMarc Zyngier int lpi_base; 131984a6a2e7SMarc Zyngier int nr_lpis; 1320c8481267SMarc Zyngier int nr_ites; 132184a6a2e7SMarc Zyngier int sz; 132284a6a2e7SMarc Zyngier 13233faf24eaSShanker Donthineni if (!its_alloc_device_table(its, dev_id)) 1324466b7d16SShanker Donthineni return NULL; 1325466b7d16SShanker Donthineni 132684a6a2e7SMarc Zyngier dev = kzalloc(sizeof(*dev), GFP_KERNEL); 1327c8481267SMarc Zyngier /* 1328c8481267SMarc Zyngier * At least one bit of EventID is being used, hence a minimum 1329c8481267SMarc Zyngier * of two entries. No, the architecture doesn't let you 1330c8481267SMarc Zyngier * express an ITT with a single entry. 1331c8481267SMarc Zyngier */ 133296555c47SWill Deacon nr_ites = max(2UL, roundup_pow_of_two(nvecs)); 1333c8481267SMarc Zyngier sz = nr_ites * its->ite_size; 133484a6a2e7SMarc Zyngier sz = max(sz, ITS_ITT_ALIGN) + ITS_ITT_ALIGN - 1; 13356c834125SYun Wu itt = kzalloc(sz, GFP_KERNEL); 133684a6a2e7SMarc Zyngier lpi_map = its_lpi_alloc_chunks(nvecs, &lpi_base, &nr_lpis); 1337591e5becSMarc Zyngier if (lpi_map) 1338591e5becSMarc Zyngier col_map = kzalloc(sizeof(*col_map) * nr_lpis, GFP_KERNEL); 133984a6a2e7SMarc Zyngier 1340591e5becSMarc Zyngier if (!dev || !itt || !lpi_map || !col_map) { 134184a6a2e7SMarc Zyngier kfree(dev); 134284a6a2e7SMarc Zyngier kfree(itt); 134384a6a2e7SMarc Zyngier kfree(lpi_map); 1344591e5becSMarc Zyngier kfree(col_map); 134584a6a2e7SMarc Zyngier return NULL; 134684a6a2e7SMarc Zyngier } 134784a6a2e7SMarc Zyngier 1348328191c0SVladimir Murzin gic_flush_dcache_to_poc(itt, sz); 13495a9a8915SMarc Zyngier 135084a6a2e7SMarc Zyngier dev->its = its; 135184a6a2e7SMarc Zyngier dev->itt = itt; 1352c8481267SMarc Zyngier dev->nr_ites = nr_ites; 1353591e5becSMarc Zyngier dev->event_map.lpi_map = lpi_map; 1354591e5becSMarc Zyngier dev->event_map.col_map = col_map; 1355591e5becSMarc Zyngier dev->event_map.lpi_base = lpi_base; 1356591e5becSMarc Zyngier dev->event_map.nr_lpis = nr_lpis; 135784a6a2e7SMarc Zyngier dev->device_id = dev_id; 135884a6a2e7SMarc Zyngier INIT_LIST_HEAD(&dev->entry); 135984a6a2e7SMarc Zyngier 13603e39e8f5SMarc Zyngier raw_spin_lock_irqsave(&its->lock, flags); 136184a6a2e7SMarc Zyngier list_add(&dev->entry, &its->its_device_list); 13623e39e8f5SMarc Zyngier raw_spin_unlock_irqrestore(&its->lock, flags); 136384a6a2e7SMarc Zyngier 136484a6a2e7SMarc Zyngier /* Map device to its ITT */ 136584a6a2e7SMarc Zyngier its_send_mapd(dev, 1); 136684a6a2e7SMarc Zyngier 136784a6a2e7SMarc Zyngier return dev; 136884a6a2e7SMarc Zyngier } 136984a6a2e7SMarc Zyngier 137084a6a2e7SMarc Zyngier static void its_free_device(struct its_device *its_dev) 137184a6a2e7SMarc Zyngier { 13723e39e8f5SMarc Zyngier unsigned long flags; 13733e39e8f5SMarc Zyngier 13743e39e8f5SMarc Zyngier raw_spin_lock_irqsave(&its_dev->its->lock, flags); 137584a6a2e7SMarc Zyngier list_del(&its_dev->entry); 13763e39e8f5SMarc Zyngier raw_spin_unlock_irqrestore(&its_dev->its->lock, flags); 137784a6a2e7SMarc Zyngier kfree(its_dev->itt); 137884a6a2e7SMarc Zyngier kfree(its_dev); 137984a6a2e7SMarc Zyngier } 1380b48ac83dSMarc Zyngier 1381b48ac83dSMarc Zyngier static int its_alloc_device_irq(struct its_device *dev, irq_hw_number_t *hwirq) 1382b48ac83dSMarc Zyngier { 1383b48ac83dSMarc Zyngier int idx; 1384b48ac83dSMarc Zyngier 1385591e5becSMarc Zyngier idx = find_first_zero_bit(dev->event_map.lpi_map, 1386591e5becSMarc Zyngier dev->event_map.nr_lpis); 1387591e5becSMarc Zyngier if (idx == dev->event_map.nr_lpis) 1388b48ac83dSMarc Zyngier return -ENOSPC; 1389b48ac83dSMarc Zyngier 1390591e5becSMarc Zyngier *hwirq = dev->event_map.lpi_base + idx; 1391591e5becSMarc Zyngier set_bit(idx, dev->event_map.lpi_map); 1392b48ac83dSMarc Zyngier 1393b48ac83dSMarc Zyngier return 0; 1394b48ac83dSMarc Zyngier } 1395b48ac83dSMarc Zyngier 139654456db9SMarc Zyngier static int its_msi_prepare(struct irq_domain *domain, struct device *dev, 1397b48ac83dSMarc Zyngier int nvec, msi_alloc_info_t *info) 1398b48ac83dSMarc Zyngier { 1399b48ac83dSMarc Zyngier struct its_node *its; 1400b48ac83dSMarc Zyngier struct its_device *its_dev; 140154456db9SMarc Zyngier struct msi_domain_info *msi_info; 140254456db9SMarc Zyngier u32 dev_id; 1403b48ac83dSMarc Zyngier 140454456db9SMarc Zyngier /* 140554456db9SMarc Zyngier * We ignore "dev" entierely, and rely on the dev_id that has 140654456db9SMarc Zyngier * been passed via the scratchpad. This limits this domain's 140754456db9SMarc Zyngier * usefulness to upper layers that definitely know that they 140854456db9SMarc Zyngier * are built on top of the ITS. 140954456db9SMarc Zyngier */ 141054456db9SMarc Zyngier dev_id = info->scratchpad[0].ul; 141154456db9SMarc Zyngier 141254456db9SMarc Zyngier msi_info = msi_get_domain_info(domain); 141354456db9SMarc Zyngier its = msi_info->data; 141454456db9SMarc Zyngier 1415f130420eSMarc Zyngier its_dev = its_find_device(its, dev_id); 1416e8137f4fSMarc Zyngier if (its_dev) { 1417e8137f4fSMarc Zyngier /* 1418e8137f4fSMarc Zyngier * We already have seen this ID, probably through 1419e8137f4fSMarc Zyngier * another alias (PCI bridge of some sort). No need to 1420e8137f4fSMarc Zyngier * create the device. 1421e8137f4fSMarc Zyngier */ 1422f130420eSMarc Zyngier pr_debug("Reusing ITT for devID %x\n", dev_id); 1423e8137f4fSMarc Zyngier goto out; 1424e8137f4fSMarc Zyngier } 1425b48ac83dSMarc Zyngier 1426f130420eSMarc Zyngier its_dev = its_create_device(its, dev_id, nvec); 1427b48ac83dSMarc Zyngier if (!its_dev) 1428b48ac83dSMarc Zyngier return -ENOMEM; 1429b48ac83dSMarc Zyngier 1430f130420eSMarc Zyngier pr_debug("ITT %d entries, %d bits\n", nvec, ilog2(nvec)); 1431e8137f4fSMarc Zyngier out: 1432b48ac83dSMarc Zyngier info->scratchpad[0].ptr = its_dev; 1433b48ac83dSMarc Zyngier return 0; 1434b48ac83dSMarc Zyngier } 1435b48ac83dSMarc Zyngier 143654456db9SMarc Zyngier static struct msi_domain_ops its_msi_domain_ops = { 143754456db9SMarc Zyngier .msi_prepare = its_msi_prepare, 143854456db9SMarc Zyngier }; 143954456db9SMarc Zyngier 1440b48ac83dSMarc Zyngier static int its_irq_gic_domain_alloc(struct irq_domain *domain, 1441b48ac83dSMarc Zyngier unsigned int virq, 1442b48ac83dSMarc Zyngier irq_hw_number_t hwirq) 1443b48ac83dSMarc Zyngier { 1444f833f57fSMarc Zyngier struct irq_fwspec fwspec; 1445b48ac83dSMarc Zyngier 1446f833f57fSMarc Zyngier if (irq_domain_get_of_node(domain->parent)) { 1447f833f57fSMarc Zyngier fwspec.fwnode = domain->parent->fwnode; 1448f833f57fSMarc Zyngier fwspec.param_count = 3; 1449f833f57fSMarc Zyngier fwspec.param[0] = GIC_IRQ_TYPE_LPI; 1450f833f57fSMarc Zyngier fwspec.param[1] = hwirq; 1451f833f57fSMarc Zyngier fwspec.param[2] = IRQ_TYPE_EDGE_RISING; 14523f010cf1STomasz Nowicki } else if (is_fwnode_irqchip(domain->parent->fwnode)) { 14533f010cf1STomasz Nowicki fwspec.fwnode = domain->parent->fwnode; 14543f010cf1STomasz Nowicki fwspec.param_count = 2; 14553f010cf1STomasz Nowicki fwspec.param[0] = hwirq; 14563f010cf1STomasz Nowicki fwspec.param[1] = IRQ_TYPE_EDGE_RISING; 1457f833f57fSMarc Zyngier } else { 1458f833f57fSMarc Zyngier return -EINVAL; 1459f833f57fSMarc Zyngier } 1460b48ac83dSMarc Zyngier 1461f833f57fSMarc Zyngier return irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec); 1462b48ac83dSMarc Zyngier } 1463b48ac83dSMarc Zyngier 1464b48ac83dSMarc Zyngier static int its_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, 1465b48ac83dSMarc Zyngier unsigned int nr_irqs, void *args) 1466b48ac83dSMarc Zyngier { 1467b48ac83dSMarc Zyngier msi_alloc_info_t *info = args; 1468b48ac83dSMarc Zyngier struct its_device *its_dev = info->scratchpad[0].ptr; 1469b48ac83dSMarc Zyngier irq_hw_number_t hwirq; 1470b48ac83dSMarc Zyngier int err; 1471b48ac83dSMarc Zyngier int i; 1472b48ac83dSMarc Zyngier 1473b48ac83dSMarc Zyngier for (i = 0; i < nr_irqs; i++) { 1474b48ac83dSMarc Zyngier err = its_alloc_device_irq(its_dev, &hwirq); 1475b48ac83dSMarc Zyngier if (err) 1476b48ac83dSMarc Zyngier return err; 1477b48ac83dSMarc Zyngier 1478b48ac83dSMarc Zyngier err = its_irq_gic_domain_alloc(domain, virq + i, hwirq); 1479b48ac83dSMarc Zyngier if (err) 1480b48ac83dSMarc Zyngier return err; 1481b48ac83dSMarc Zyngier 1482b48ac83dSMarc Zyngier irq_domain_set_hwirq_and_chip(domain, virq + i, 1483b48ac83dSMarc Zyngier hwirq, &its_irq_chip, its_dev); 1484f130420eSMarc Zyngier pr_debug("ID:%d pID:%d vID:%d\n", 1485591e5becSMarc Zyngier (int)(hwirq - its_dev->event_map.lpi_base), 1486591e5becSMarc Zyngier (int) hwirq, virq + i); 1487b48ac83dSMarc Zyngier } 1488b48ac83dSMarc Zyngier 1489b48ac83dSMarc Zyngier return 0; 1490b48ac83dSMarc Zyngier } 1491b48ac83dSMarc Zyngier 1492aca268dfSMarc Zyngier static void its_irq_domain_activate(struct irq_domain *domain, 1493aca268dfSMarc Zyngier struct irq_data *d) 1494aca268dfSMarc Zyngier { 1495aca268dfSMarc Zyngier struct its_device *its_dev = irq_data_get_irq_chip_data(d); 1496aca268dfSMarc Zyngier u32 event = its_get_event_id(d); 1497fbf8f40eSGanapatrao Kulkarni const struct cpumask *cpu_mask = cpu_online_mask; 1498fbf8f40eSGanapatrao Kulkarni 1499fbf8f40eSGanapatrao Kulkarni /* get the cpu_mask of local node */ 1500fbf8f40eSGanapatrao Kulkarni if (its_dev->its->numa_node >= 0) 1501fbf8f40eSGanapatrao Kulkarni cpu_mask = cpumask_of_node(its_dev->its->numa_node); 1502aca268dfSMarc Zyngier 1503591e5becSMarc Zyngier /* Bind the LPI to the first possible CPU */ 1504fbf8f40eSGanapatrao Kulkarni its_dev->event_map.col_map[event] = cpumask_first(cpu_mask); 1505591e5becSMarc Zyngier 1506aca268dfSMarc Zyngier /* Map the GIC IRQ and event to the device */ 15076a25ad3aSMarc Zyngier its_send_mapti(its_dev, d->hwirq, event); 1508aca268dfSMarc Zyngier } 1509aca268dfSMarc Zyngier 1510aca268dfSMarc Zyngier static void its_irq_domain_deactivate(struct irq_domain *domain, 1511aca268dfSMarc Zyngier struct irq_data *d) 1512aca268dfSMarc Zyngier { 1513aca268dfSMarc Zyngier struct its_device *its_dev = irq_data_get_irq_chip_data(d); 1514aca268dfSMarc Zyngier u32 event = its_get_event_id(d); 1515aca268dfSMarc Zyngier 1516aca268dfSMarc Zyngier /* Stop the delivery of interrupts */ 1517aca268dfSMarc Zyngier its_send_discard(its_dev, event); 1518aca268dfSMarc Zyngier } 1519aca268dfSMarc Zyngier 1520b48ac83dSMarc Zyngier static void its_irq_domain_free(struct irq_domain *domain, unsigned int virq, 1521b48ac83dSMarc Zyngier unsigned int nr_irqs) 1522b48ac83dSMarc Zyngier { 1523b48ac83dSMarc Zyngier struct irq_data *d = irq_domain_get_irq_data(domain, virq); 1524b48ac83dSMarc Zyngier struct its_device *its_dev = irq_data_get_irq_chip_data(d); 1525b48ac83dSMarc Zyngier int i; 1526b48ac83dSMarc Zyngier 1527b48ac83dSMarc Zyngier for (i = 0; i < nr_irqs; i++) { 1528b48ac83dSMarc Zyngier struct irq_data *data = irq_domain_get_irq_data(domain, 1529b48ac83dSMarc Zyngier virq + i); 1530aca268dfSMarc Zyngier u32 event = its_get_event_id(data); 1531b48ac83dSMarc Zyngier 1532b48ac83dSMarc Zyngier /* Mark interrupt index as unused */ 1533591e5becSMarc Zyngier clear_bit(event, its_dev->event_map.lpi_map); 1534b48ac83dSMarc Zyngier 1535b48ac83dSMarc Zyngier /* Nuke the entry in the domain */ 15362da39949SMarc Zyngier irq_domain_reset_irq_data(data); 1537b48ac83dSMarc Zyngier } 1538b48ac83dSMarc Zyngier 1539b48ac83dSMarc Zyngier /* If all interrupts have been freed, start mopping the floor */ 1540591e5becSMarc Zyngier if (bitmap_empty(its_dev->event_map.lpi_map, 1541591e5becSMarc Zyngier its_dev->event_map.nr_lpis)) { 1542591e5becSMarc Zyngier its_lpi_free(&its_dev->event_map); 1543b48ac83dSMarc Zyngier 1544b48ac83dSMarc Zyngier /* Unmap device/itt */ 1545b48ac83dSMarc Zyngier its_send_mapd(its_dev, 0); 1546b48ac83dSMarc Zyngier its_free_device(its_dev); 1547b48ac83dSMarc Zyngier } 1548b48ac83dSMarc Zyngier 1549b48ac83dSMarc Zyngier irq_domain_free_irqs_parent(domain, virq, nr_irqs); 1550b48ac83dSMarc Zyngier } 1551b48ac83dSMarc Zyngier 1552b48ac83dSMarc Zyngier static const struct irq_domain_ops its_domain_ops = { 1553b48ac83dSMarc Zyngier .alloc = its_irq_domain_alloc, 1554b48ac83dSMarc Zyngier .free = its_irq_domain_free, 1555aca268dfSMarc Zyngier .activate = its_irq_domain_activate, 1556aca268dfSMarc Zyngier .deactivate = its_irq_domain_deactivate, 1557b48ac83dSMarc Zyngier }; 15584c21f3c2SMarc Zyngier 15594559fbb3SYun Wu static int its_force_quiescent(void __iomem *base) 15604559fbb3SYun Wu { 15614559fbb3SYun Wu u32 count = 1000000; /* 1s */ 15624559fbb3SYun Wu u32 val; 15634559fbb3SYun Wu 15644559fbb3SYun Wu val = readl_relaxed(base + GITS_CTLR); 15657611da86SDavid Daney /* 15667611da86SDavid Daney * GIC architecture specification requires the ITS to be both 15677611da86SDavid Daney * disabled and quiescent for writes to GITS_BASER<n> or 15687611da86SDavid Daney * GITS_CBASER to not have UNPREDICTABLE results. 15697611da86SDavid Daney */ 15707611da86SDavid Daney if ((val & GITS_CTLR_QUIESCENT) && !(val & GITS_CTLR_ENABLE)) 15714559fbb3SYun Wu return 0; 15724559fbb3SYun Wu 15734559fbb3SYun Wu /* Disable the generation of all interrupts to this ITS */ 15744559fbb3SYun Wu val &= ~GITS_CTLR_ENABLE; 15754559fbb3SYun Wu writel_relaxed(val, base + GITS_CTLR); 15764559fbb3SYun Wu 15774559fbb3SYun Wu /* Poll GITS_CTLR and wait until ITS becomes quiescent */ 15784559fbb3SYun Wu while (1) { 15794559fbb3SYun Wu val = readl_relaxed(base + GITS_CTLR); 15804559fbb3SYun Wu if (val & GITS_CTLR_QUIESCENT) 15814559fbb3SYun Wu return 0; 15824559fbb3SYun Wu 15834559fbb3SYun Wu count--; 15844559fbb3SYun Wu if (!count) 15854559fbb3SYun Wu return -EBUSY; 15864559fbb3SYun Wu 15874559fbb3SYun Wu cpu_relax(); 15884559fbb3SYun Wu udelay(1); 15894559fbb3SYun Wu } 15904559fbb3SYun Wu } 15914559fbb3SYun Wu 159294100970SRobert Richter static void __maybe_unused its_enable_quirk_cavium_22375(void *data) 159394100970SRobert Richter { 159494100970SRobert Richter struct its_node *its = data; 159594100970SRobert Richter 159694100970SRobert Richter its->flags |= ITS_FLAGS_WORKAROUND_CAVIUM_22375; 159794100970SRobert Richter } 159894100970SRobert Richter 1599fbf8f40eSGanapatrao Kulkarni static void __maybe_unused its_enable_quirk_cavium_23144(void *data) 1600fbf8f40eSGanapatrao Kulkarni { 1601fbf8f40eSGanapatrao Kulkarni struct its_node *its = data; 1602fbf8f40eSGanapatrao Kulkarni 1603fbf8f40eSGanapatrao Kulkarni its->flags |= ITS_FLAGS_WORKAROUND_CAVIUM_23144; 1604fbf8f40eSGanapatrao Kulkarni } 1605fbf8f40eSGanapatrao Kulkarni 160690922a2dSShanker Donthineni static void __maybe_unused its_enable_quirk_qdf2400_e0065(void *data) 160790922a2dSShanker Donthineni { 160890922a2dSShanker Donthineni struct its_node *its = data; 160990922a2dSShanker Donthineni 161090922a2dSShanker Donthineni /* On QDF2400, the size of the ITE is 16Bytes */ 161190922a2dSShanker Donthineni its->ite_size = 16; 161290922a2dSShanker Donthineni } 161390922a2dSShanker Donthineni 161467510ccaSRobert Richter static const struct gic_quirk its_quirks[] = { 161594100970SRobert Richter #ifdef CONFIG_CAVIUM_ERRATUM_22375 161694100970SRobert Richter { 161794100970SRobert Richter .desc = "ITS: Cavium errata 22375, 24313", 161894100970SRobert Richter .iidr = 0xa100034c, /* ThunderX pass 1.x */ 161994100970SRobert Richter .mask = 0xffff0fff, 162094100970SRobert Richter .init = its_enable_quirk_cavium_22375, 162194100970SRobert Richter }, 162294100970SRobert Richter #endif 1623fbf8f40eSGanapatrao Kulkarni #ifdef CONFIG_CAVIUM_ERRATUM_23144 1624fbf8f40eSGanapatrao Kulkarni { 1625fbf8f40eSGanapatrao Kulkarni .desc = "ITS: Cavium erratum 23144", 1626fbf8f40eSGanapatrao Kulkarni .iidr = 0xa100034c, /* ThunderX pass 1.x */ 1627fbf8f40eSGanapatrao Kulkarni .mask = 0xffff0fff, 1628fbf8f40eSGanapatrao Kulkarni .init = its_enable_quirk_cavium_23144, 1629fbf8f40eSGanapatrao Kulkarni }, 1630fbf8f40eSGanapatrao Kulkarni #endif 163190922a2dSShanker Donthineni #ifdef CONFIG_QCOM_QDF2400_ERRATUM_0065 163290922a2dSShanker Donthineni { 163390922a2dSShanker Donthineni .desc = "ITS: QDF2400 erratum 0065", 163490922a2dSShanker Donthineni .iidr = 0x00001070, /* QDF2400 ITS rev 1.x */ 163590922a2dSShanker Donthineni .mask = 0xffffffff, 163690922a2dSShanker Donthineni .init = its_enable_quirk_qdf2400_e0065, 163790922a2dSShanker Donthineni }, 163890922a2dSShanker Donthineni #endif 163967510ccaSRobert Richter { 164067510ccaSRobert Richter } 164167510ccaSRobert Richter }; 164267510ccaSRobert Richter 164367510ccaSRobert Richter static void its_enable_quirks(struct its_node *its) 164467510ccaSRobert Richter { 164567510ccaSRobert Richter u32 iidr = readl_relaxed(its->base + GITS_IIDR); 164667510ccaSRobert Richter 164767510ccaSRobert Richter gic_enable_quirks(iidr, its_quirks, its); 164867510ccaSRobert Richter } 164967510ccaSRobert Richter 1650db40f0a7STomasz Nowicki static int its_init_domain(struct fwnode_handle *handle, struct its_node *its) 1651d14ae5e6STomasz Nowicki { 1652d14ae5e6STomasz Nowicki struct irq_domain *inner_domain; 1653d14ae5e6STomasz Nowicki struct msi_domain_info *info; 1654d14ae5e6STomasz Nowicki 1655d14ae5e6STomasz Nowicki info = kzalloc(sizeof(*info), GFP_KERNEL); 1656d14ae5e6STomasz Nowicki if (!info) 1657d14ae5e6STomasz Nowicki return -ENOMEM; 1658d14ae5e6STomasz Nowicki 1659db40f0a7STomasz Nowicki inner_domain = irq_domain_create_tree(handle, &its_domain_ops, its); 1660d14ae5e6STomasz Nowicki if (!inner_domain) { 1661d14ae5e6STomasz Nowicki kfree(info); 1662d14ae5e6STomasz Nowicki return -ENOMEM; 1663d14ae5e6STomasz Nowicki } 1664d14ae5e6STomasz Nowicki 1665db40f0a7STomasz Nowicki inner_domain->parent = its_parent; 1666d14ae5e6STomasz Nowicki inner_domain->bus_token = DOMAIN_BUS_NEXUS; 166759768527SEric Auger inner_domain->flags |= IRQ_DOMAIN_FLAG_MSI_REMAP; 1668d14ae5e6STomasz Nowicki info->ops = &its_msi_domain_ops; 1669d14ae5e6STomasz Nowicki info->data = its; 1670d14ae5e6STomasz Nowicki inner_domain->host_data = info; 1671d14ae5e6STomasz Nowicki 1672d14ae5e6STomasz Nowicki return 0; 1673d14ae5e6STomasz Nowicki } 1674d14ae5e6STomasz Nowicki 1675db40f0a7STomasz Nowicki static int __init its_probe_one(struct resource *res, 1676db40f0a7STomasz Nowicki struct fwnode_handle *handle, int numa_node) 16774c21f3c2SMarc Zyngier { 16784c21f3c2SMarc Zyngier struct its_node *its; 16794c21f3c2SMarc Zyngier void __iomem *its_base; 16804c21f3c2SMarc Zyngier u32 val; 16814c21f3c2SMarc Zyngier u64 baser, tmp; 16824c21f3c2SMarc Zyngier int err; 16834c21f3c2SMarc Zyngier 1684db40f0a7STomasz Nowicki its_base = ioremap(res->start, resource_size(res)); 16854c21f3c2SMarc Zyngier if (!its_base) { 1686db40f0a7STomasz Nowicki pr_warn("ITS@%pa: Unable to map ITS registers\n", &res->start); 16874c21f3c2SMarc Zyngier return -ENOMEM; 16884c21f3c2SMarc Zyngier } 16894c21f3c2SMarc Zyngier 16904c21f3c2SMarc Zyngier val = readl_relaxed(its_base + GITS_PIDR2) & GIC_PIDR2_ARCH_MASK; 16914c21f3c2SMarc Zyngier if (val != 0x30 && val != 0x40) { 1692db40f0a7STomasz Nowicki pr_warn("ITS@%pa: No ITS detected, giving up\n", &res->start); 16934c21f3c2SMarc Zyngier err = -ENODEV; 16944c21f3c2SMarc Zyngier goto out_unmap; 16954c21f3c2SMarc Zyngier } 16964c21f3c2SMarc Zyngier 16974559fbb3SYun Wu err = its_force_quiescent(its_base); 16984559fbb3SYun Wu if (err) { 1699db40f0a7STomasz Nowicki pr_warn("ITS@%pa: Failed to quiesce, giving up\n", &res->start); 17004559fbb3SYun Wu goto out_unmap; 17014559fbb3SYun Wu } 17024559fbb3SYun Wu 1703db40f0a7STomasz Nowicki pr_info("ITS %pR\n", res); 17044c21f3c2SMarc Zyngier 17054c21f3c2SMarc Zyngier its = kzalloc(sizeof(*its), GFP_KERNEL); 17064c21f3c2SMarc Zyngier if (!its) { 17074c21f3c2SMarc Zyngier err = -ENOMEM; 17084c21f3c2SMarc Zyngier goto out_unmap; 17094c21f3c2SMarc Zyngier } 17104c21f3c2SMarc Zyngier 17114c21f3c2SMarc Zyngier raw_spin_lock_init(&its->lock); 17124c21f3c2SMarc Zyngier INIT_LIST_HEAD(&its->entry); 17134c21f3c2SMarc Zyngier INIT_LIST_HEAD(&its->its_device_list); 17144c21f3c2SMarc Zyngier its->base = its_base; 1715db40f0a7STomasz Nowicki its->phys_base = res->start; 1716589ce5f4SMarc Zyngier its->ite_size = ((gic_read_typer(its_base + GITS_TYPER) >> 4) & 0xf) + 1; 1717db40f0a7STomasz Nowicki its->numa_node = numa_node; 17184c21f3c2SMarc Zyngier 17195bc13c2cSRobert Richter its->cmd_base = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 17205bc13c2cSRobert Richter get_order(ITS_CMD_QUEUE_SZ)); 17214c21f3c2SMarc Zyngier if (!its->cmd_base) { 17224c21f3c2SMarc Zyngier err = -ENOMEM; 17234c21f3c2SMarc Zyngier goto out_free_its; 17244c21f3c2SMarc Zyngier } 17254c21f3c2SMarc Zyngier its->cmd_write = its->cmd_base; 17264c21f3c2SMarc Zyngier 172767510ccaSRobert Richter its_enable_quirks(its); 172867510ccaSRobert Richter 17290e0b0f69SShanker Donthineni err = its_alloc_tables(its); 17304c21f3c2SMarc Zyngier if (err) 17314c21f3c2SMarc Zyngier goto out_free_cmd; 17324c21f3c2SMarc Zyngier 17334c21f3c2SMarc Zyngier err = its_alloc_collections(its); 17344c21f3c2SMarc Zyngier if (err) 17354c21f3c2SMarc Zyngier goto out_free_tables; 17364c21f3c2SMarc Zyngier 17374c21f3c2SMarc Zyngier baser = (virt_to_phys(its->cmd_base) | 17382fd632a0SShanker Donthineni GITS_CBASER_RaWaWb | 17394c21f3c2SMarc Zyngier GITS_CBASER_InnerShareable | 17404c21f3c2SMarc Zyngier (ITS_CMD_QUEUE_SZ / SZ_4K - 1) | 17414c21f3c2SMarc Zyngier GITS_CBASER_VALID); 17424c21f3c2SMarc Zyngier 17430968a619SVladimir Murzin gits_write_cbaser(baser, its->base + GITS_CBASER); 17440968a619SVladimir Murzin tmp = gits_read_cbaser(its->base + GITS_CBASER); 17454c21f3c2SMarc Zyngier 17464ad3e363SMarc Zyngier if ((tmp ^ baser) & GITS_CBASER_SHAREABILITY_MASK) { 1747241a386cSMarc Zyngier if (!(tmp & GITS_CBASER_SHAREABILITY_MASK)) { 1748241a386cSMarc Zyngier /* 1749241a386cSMarc Zyngier * The HW reports non-shareable, we must 1750241a386cSMarc Zyngier * remove the cacheability attributes as 1751241a386cSMarc Zyngier * well. 1752241a386cSMarc Zyngier */ 1753241a386cSMarc Zyngier baser &= ~(GITS_CBASER_SHAREABILITY_MASK | 1754241a386cSMarc Zyngier GITS_CBASER_CACHEABILITY_MASK); 1755241a386cSMarc Zyngier baser |= GITS_CBASER_nC; 17560968a619SVladimir Murzin gits_write_cbaser(baser, its->base + GITS_CBASER); 1757241a386cSMarc Zyngier } 17584c21f3c2SMarc Zyngier pr_info("ITS: using cache flushing for cmd queue\n"); 17594c21f3c2SMarc Zyngier its->flags |= ITS_FLAGS_CMDQ_NEEDS_FLUSHING; 17604c21f3c2SMarc Zyngier } 17614c21f3c2SMarc Zyngier 17620968a619SVladimir Murzin gits_write_cwriter(0, its->base + GITS_CWRITER); 1763241a386cSMarc Zyngier writel_relaxed(GITS_CTLR_ENABLE, its->base + GITS_CTLR); 1764241a386cSMarc Zyngier 1765db40f0a7STomasz Nowicki err = its_init_domain(handle, its); 1766d14ae5e6STomasz Nowicki if (err) 176754456db9SMarc Zyngier goto out_free_tables; 17684c21f3c2SMarc Zyngier 17694c21f3c2SMarc Zyngier spin_lock(&its_lock); 17704c21f3c2SMarc Zyngier list_add(&its->entry, &its_nodes); 17714c21f3c2SMarc Zyngier spin_unlock(&its_lock); 17724c21f3c2SMarc Zyngier 17734c21f3c2SMarc Zyngier return 0; 17744c21f3c2SMarc Zyngier 17754c21f3c2SMarc Zyngier out_free_tables: 17764c21f3c2SMarc Zyngier its_free_tables(its); 17774c21f3c2SMarc Zyngier out_free_cmd: 17785bc13c2cSRobert Richter free_pages((unsigned long)its->cmd_base, get_order(ITS_CMD_QUEUE_SZ)); 17794c21f3c2SMarc Zyngier out_free_its: 17804c21f3c2SMarc Zyngier kfree(its); 17814c21f3c2SMarc Zyngier out_unmap: 17824c21f3c2SMarc Zyngier iounmap(its_base); 1783db40f0a7STomasz Nowicki pr_err("ITS@%pa: failed probing (%d)\n", &res->start, err); 17844c21f3c2SMarc Zyngier return err; 17854c21f3c2SMarc Zyngier } 17864c21f3c2SMarc Zyngier 17874c21f3c2SMarc Zyngier static bool gic_rdists_supports_plpis(void) 17884c21f3c2SMarc Zyngier { 1789589ce5f4SMarc Zyngier return !!(gic_read_typer(gic_data_rdist_rd_base() + GICR_TYPER) & GICR_TYPER_PLPIS); 17904c21f3c2SMarc Zyngier } 17914c21f3c2SMarc Zyngier 17924c21f3c2SMarc Zyngier int its_cpu_init(void) 17934c21f3c2SMarc Zyngier { 179416acae72SVladimir Murzin if (!list_empty(&its_nodes)) { 17954c21f3c2SMarc Zyngier if (!gic_rdists_supports_plpis()) { 17964c21f3c2SMarc Zyngier pr_info("CPU%d: LPIs not supported\n", smp_processor_id()); 17974c21f3c2SMarc Zyngier return -ENXIO; 17984c21f3c2SMarc Zyngier } 17994c21f3c2SMarc Zyngier its_cpu_init_lpis(); 18004c21f3c2SMarc Zyngier its_cpu_init_collection(); 18014c21f3c2SMarc Zyngier } 18024c21f3c2SMarc Zyngier 18034c21f3c2SMarc Zyngier return 0; 18044c21f3c2SMarc Zyngier } 18054c21f3c2SMarc Zyngier 1806935bba7cSArvind Yadav static const struct of_device_id its_device_id[] = { 18074c21f3c2SMarc Zyngier { .compatible = "arm,gic-v3-its", }, 18084c21f3c2SMarc Zyngier {}, 18094c21f3c2SMarc Zyngier }; 18104c21f3c2SMarc Zyngier 1811db40f0a7STomasz Nowicki static int __init its_of_probe(struct device_node *node) 18124c21f3c2SMarc Zyngier { 18134c21f3c2SMarc Zyngier struct device_node *np; 1814db40f0a7STomasz Nowicki struct resource res; 18154c21f3c2SMarc Zyngier 18164c21f3c2SMarc Zyngier for (np = of_find_matching_node(node, its_device_id); np; 18174c21f3c2SMarc Zyngier np = of_find_matching_node(np, its_device_id)) { 1818d14ae5e6STomasz Nowicki if (!of_property_read_bool(np, "msi-controller")) { 1819d14ae5e6STomasz Nowicki pr_warn("%s: no msi-controller property, ITS ignored\n", 1820d14ae5e6STomasz Nowicki np->full_name); 1821d14ae5e6STomasz Nowicki continue; 1822d14ae5e6STomasz Nowicki } 1823d14ae5e6STomasz Nowicki 1824db40f0a7STomasz Nowicki if (of_address_to_resource(np, 0, &res)) { 1825db40f0a7STomasz Nowicki pr_warn("%s: no regs?\n", np->full_name); 1826db40f0a7STomasz Nowicki continue; 18274c21f3c2SMarc Zyngier } 18284c21f3c2SMarc Zyngier 1829db40f0a7STomasz Nowicki its_probe_one(&res, &np->fwnode, of_node_to_nid(np)); 1830db40f0a7STomasz Nowicki } 1831db40f0a7STomasz Nowicki return 0; 1832db40f0a7STomasz Nowicki } 1833db40f0a7STomasz Nowicki 18343f010cf1STomasz Nowicki #ifdef CONFIG_ACPI 18353f010cf1STomasz Nowicki 18363f010cf1STomasz Nowicki #define ACPI_GICV3_ITS_MEM_SIZE (SZ_128K) 18373f010cf1STomasz Nowicki 1838*d1ce263fSRobert Richter #ifdef CONFIG_ACPI_NUMA 1839dbd2b826SGanapatrao Kulkarni struct its_srat_map { 1840dbd2b826SGanapatrao Kulkarni /* numa node id */ 1841dbd2b826SGanapatrao Kulkarni u32 numa_node; 1842dbd2b826SGanapatrao Kulkarni /* GIC ITS ID */ 1843dbd2b826SGanapatrao Kulkarni u32 its_id; 1844dbd2b826SGanapatrao Kulkarni }; 1845dbd2b826SGanapatrao Kulkarni 1846dbd2b826SGanapatrao Kulkarni static struct its_srat_map its_srat_maps[MAX_NUMNODES] __initdata; 1847dbd2b826SGanapatrao Kulkarni static int its_in_srat __initdata; 1848dbd2b826SGanapatrao Kulkarni 1849dbd2b826SGanapatrao Kulkarni static int __init acpi_get_its_numa_node(u32 its_id) 1850dbd2b826SGanapatrao Kulkarni { 1851dbd2b826SGanapatrao Kulkarni int i; 1852dbd2b826SGanapatrao Kulkarni 1853dbd2b826SGanapatrao Kulkarni for (i = 0; i < its_in_srat; i++) { 1854dbd2b826SGanapatrao Kulkarni if (its_id == its_srat_maps[i].its_id) 1855dbd2b826SGanapatrao Kulkarni return its_srat_maps[i].numa_node; 1856dbd2b826SGanapatrao Kulkarni } 1857dbd2b826SGanapatrao Kulkarni return NUMA_NO_NODE; 1858dbd2b826SGanapatrao Kulkarni } 1859dbd2b826SGanapatrao Kulkarni 1860dbd2b826SGanapatrao Kulkarni static int __init gic_acpi_parse_srat_its(struct acpi_subtable_header *header, 1861dbd2b826SGanapatrao Kulkarni const unsigned long end) 1862dbd2b826SGanapatrao Kulkarni { 1863dbd2b826SGanapatrao Kulkarni int node; 1864dbd2b826SGanapatrao Kulkarni struct acpi_srat_gic_its_affinity *its_affinity; 1865dbd2b826SGanapatrao Kulkarni 1866dbd2b826SGanapatrao Kulkarni its_affinity = (struct acpi_srat_gic_its_affinity *)header; 1867dbd2b826SGanapatrao Kulkarni if (!its_affinity) 1868dbd2b826SGanapatrao Kulkarni return -EINVAL; 1869dbd2b826SGanapatrao Kulkarni 1870dbd2b826SGanapatrao Kulkarni if (its_affinity->header.length < sizeof(*its_affinity)) { 1871dbd2b826SGanapatrao Kulkarni pr_err("SRAT: Invalid header length %d in ITS affinity\n", 1872dbd2b826SGanapatrao Kulkarni its_affinity->header.length); 1873dbd2b826SGanapatrao Kulkarni return -EINVAL; 1874dbd2b826SGanapatrao Kulkarni } 1875dbd2b826SGanapatrao Kulkarni 1876dbd2b826SGanapatrao Kulkarni if (its_in_srat >= MAX_NUMNODES) { 1877dbd2b826SGanapatrao Kulkarni pr_err("SRAT: ITS affinity exceeding max count[%d]\n", 1878dbd2b826SGanapatrao Kulkarni MAX_NUMNODES); 1879dbd2b826SGanapatrao Kulkarni return -EINVAL; 1880dbd2b826SGanapatrao Kulkarni } 1881dbd2b826SGanapatrao Kulkarni 1882dbd2b826SGanapatrao Kulkarni node = acpi_map_pxm_to_node(its_affinity->proximity_domain); 1883dbd2b826SGanapatrao Kulkarni 1884dbd2b826SGanapatrao Kulkarni if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) { 1885dbd2b826SGanapatrao Kulkarni pr_err("SRAT: Invalid NUMA node %d in ITS affinity\n", node); 1886dbd2b826SGanapatrao Kulkarni return 0; 1887dbd2b826SGanapatrao Kulkarni } 1888dbd2b826SGanapatrao Kulkarni 1889dbd2b826SGanapatrao Kulkarni its_srat_maps[its_in_srat].numa_node = node; 1890dbd2b826SGanapatrao Kulkarni its_srat_maps[its_in_srat].its_id = its_affinity->its_id; 1891dbd2b826SGanapatrao Kulkarni its_in_srat++; 1892dbd2b826SGanapatrao Kulkarni pr_info("SRAT: PXM %d -> ITS %d -> Node %d\n", 1893dbd2b826SGanapatrao Kulkarni its_affinity->proximity_domain, its_affinity->its_id, node); 1894dbd2b826SGanapatrao Kulkarni 1895dbd2b826SGanapatrao Kulkarni return 0; 1896dbd2b826SGanapatrao Kulkarni } 1897dbd2b826SGanapatrao Kulkarni 1898dbd2b826SGanapatrao Kulkarni static void __init acpi_table_parse_srat_its(void) 1899dbd2b826SGanapatrao Kulkarni { 1900dbd2b826SGanapatrao Kulkarni acpi_table_parse_entries(ACPI_SIG_SRAT, 1901dbd2b826SGanapatrao Kulkarni sizeof(struct acpi_table_srat), 1902dbd2b826SGanapatrao Kulkarni ACPI_SRAT_TYPE_GIC_ITS_AFFINITY, 1903dbd2b826SGanapatrao Kulkarni gic_acpi_parse_srat_its, 0); 1904dbd2b826SGanapatrao Kulkarni } 1905dbd2b826SGanapatrao Kulkarni #else 1906dbd2b826SGanapatrao Kulkarni static void __init acpi_table_parse_srat_its(void) { } 1907dbd2b826SGanapatrao Kulkarni static int __init acpi_get_its_numa_node(u32 its_id) { return NUMA_NO_NODE; } 1908dbd2b826SGanapatrao Kulkarni #endif 1909dbd2b826SGanapatrao Kulkarni 19103f010cf1STomasz Nowicki static int __init gic_acpi_parse_madt_its(struct acpi_subtable_header *header, 19113f010cf1STomasz Nowicki const unsigned long end) 19123f010cf1STomasz Nowicki { 19133f010cf1STomasz Nowicki struct acpi_madt_generic_translator *its_entry; 19143f010cf1STomasz Nowicki struct fwnode_handle *dom_handle; 19153f010cf1STomasz Nowicki struct resource res; 19163f010cf1STomasz Nowicki int err; 19173f010cf1STomasz Nowicki 19183f010cf1STomasz Nowicki its_entry = (struct acpi_madt_generic_translator *)header; 19193f010cf1STomasz Nowicki memset(&res, 0, sizeof(res)); 19203f010cf1STomasz Nowicki res.start = its_entry->base_address; 19213f010cf1STomasz Nowicki res.end = its_entry->base_address + ACPI_GICV3_ITS_MEM_SIZE - 1; 19223f010cf1STomasz Nowicki res.flags = IORESOURCE_MEM; 19233f010cf1STomasz Nowicki 19243f010cf1STomasz Nowicki dom_handle = irq_domain_alloc_fwnode((void *)its_entry->base_address); 19253f010cf1STomasz Nowicki if (!dom_handle) { 19263f010cf1STomasz Nowicki pr_err("ITS@%pa: Unable to allocate GICv3 ITS domain token\n", 19273f010cf1STomasz Nowicki &res.start); 19283f010cf1STomasz Nowicki return -ENOMEM; 19293f010cf1STomasz Nowicki } 19303f010cf1STomasz Nowicki 19313f010cf1STomasz Nowicki err = iort_register_domain_token(its_entry->translation_id, dom_handle); 19323f010cf1STomasz Nowicki if (err) { 19333f010cf1STomasz Nowicki pr_err("ITS@%pa: Unable to register GICv3 ITS domain token (ITS ID %d) to IORT\n", 19343f010cf1STomasz Nowicki &res.start, its_entry->translation_id); 19353f010cf1STomasz Nowicki goto dom_err; 19363f010cf1STomasz Nowicki } 19373f010cf1STomasz Nowicki 1938dbd2b826SGanapatrao Kulkarni err = its_probe_one(&res, dom_handle, 1939dbd2b826SGanapatrao Kulkarni acpi_get_its_numa_node(its_entry->translation_id)); 19403f010cf1STomasz Nowicki if (!err) 19413f010cf1STomasz Nowicki return 0; 19423f010cf1STomasz Nowicki 19433f010cf1STomasz Nowicki iort_deregister_domain_token(its_entry->translation_id); 19443f010cf1STomasz Nowicki dom_err: 19453f010cf1STomasz Nowicki irq_domain_free_fwnode(dom_handle); 19463f010cf1STomasz Nowicki return err; 19473f010cf1STomasz Nowicki } 19483f010cf1STomasz Nowicki 19493f010cf1STomasz Nowicki static void __init its_acpi_probe(void) 19503f010cf1STomasz Nowicki { 1951dbd2b826SGanapatrao Kulkarni acpi_table_parse_srat_its(); 19523f010cf1STomasz Nowicki acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR, 19533f010cf1STomasz Nowicki gic_acpi_parse_madt_its, 0); 19543f010cf1STomasz Nowicki } 19553f010cf1STomasz Nowicki #else 19563f010cf1STomasz Nowicki static void __init its_acpi_probe(void) { } 19573f010cf1STomasz Nowicki #endif 19583f010cf1STomasz Nowicki 1959db40f0a7STomasz Nowicki int __init its_init(struct fwnode_handle *handle, struct rdists *rdists, 1960db40f0a7STomasz Nowicki struct irq_domain *parent_domain) 1961db40f0a7STomasz Nowicki { 1962db40f0a7STomasz Nowicki struct device_node *of_node; 1963db40f0a7STomasz Nowicki 1964db40f0a7STomasz Nowicki its_parent = parent_domain; 1965db40f0a7STomasz Nowicki of_node = to_of_node(handle); 1966db40f0a7STomasz Nowicki if (of_node) 1967db40f0a7STomasz Nowicki its_of_probe(of_node); 1968db40f0a7STomasz Nowicki else 19693f010cf1STomasz Nowicki its_acpi_probe(); 1970db40f0a7STomasz Nowicki 19714c21f3c2SMarc Zyngier if (list_empty(&its_nodes)) { 19724c21f3c2SMarc Zyngier pr_warn("ITS: No ITS available, not enabling LPIs\n"); 19734c21f3c2SMarc Zyngier return -ENXIO; 19744c21f3c2SMarc Zyngier } 19754c21f3c2SMarc Zyngier 19764c21f3c2SMarc Zyngier gic_rdists = rdists; 19776c31e123SShanker Donthineni return its_alloc_lpi_tables(); 19784c21f3c2SMarc Zyngier } 1979