2 * Copyright (C) 2013-2017 ARM Limited, All Rights Reserved.
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 #include <linux/acpi.h>
19 #include <linux/acpi_iort.h>
20 #include <linux/bitmap.h>
21 #include <linux/cpu.h>
22 #include <linux/crash_dump.h>
23 #include <linux/delay.h>
24 #include <linux/dma-iommu.h>
25 #include <linux/efi.h>
26 #include <linux/interrupt.h>
27 #include <linux/irqdomain.h>
28 #include <linux/list.h>
29 #include <linux/log2.h>
30 #include <linux/memblock.h>
32 #include <linux/msi.h>
34 #include <linux/of_address.h>
35 #include <linux/of_irq.h>
36 #include <linux/of_pci.h>
37 #include <linux/of_platform.h>
38 #include <linux/percpu.h>
39 #include <linux/slab.h>
40 #include <linux/syscore_ops.h>
42 #include <linux/irqchip.h>
43 #include <linux/irqchip/arm-gic-v3.h>
44 #include <linux/irqchip/arm-gic-v4.h>
46 #include <asm/cputype.h>
47 #include <asm/exception.h>
49 #include "irq-gic-common.h"
51 #define ITS_FLAGS_CMDQ_NEEDS_FLUSHING (1ULL << 0)
52 #define ITS_FLAGS_WORKAROUND_CAVIUM_22375 (1ULL << 1)
53 #define ITS_FLAGS_WORKAROUND_CAVIUM_23144 (1ULL << 2)
54 #define ITS_FLAGS_SAVE_SUSPEND_STATE (1ULL << 3)
56 #define RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING (1 << 0)
57 #define RDIST_FLAGS_RD_TABLES_PREALLOCATED (1 << 1)
59 static u32 lpi_id_bits;
62 * We allocate memory for PROPBASE to cover 2 ^ lpi_id_bits LPIs to
63 * deal with (one configuration byte per interrupt). PENDBASE has to
64 * be 64kB aligned (one bit per LPI, plus 8192 bits for SPI/PPI/SGI).
66 #define LPI_NRBITS lpi_id_bits
67 #define LPI_PROPBASE_SZ ALIGN(BIT(LPI_NRBITS), SZ_64K)
68 #define LPI_PENDBASE_SZ ALIGN(BIT(LPI_NRBITS) / 8, SZ_64K)
70 #define LPI_PROP_DEFAULT_PRIO GICD_INT_DEF_PRI
73 * Collection structure - just an ID, and a redistributor address to
74 * ping. We use one per CPU as a bag of interrupts assigned to this
77 struct its_collection {
83 * The ITS_BASER structure - contains memory information, cached
84 * value of BASER register configuration and ITS page size.
96 * The ITS structure - contains most of the infrastructure, with the
97 * top-level MSI domain, the command queue, the collections, and the
98 * list of devices writing to it.
100 * dev_alloc_lock has to be taken for device allocations, while the
101 * spinlock must be taken to parse data structures such as the device
106 struct mutex dev_alloc_lock;
107 struct list_head entry;
109 phys_addr_t phys_base;
110 struct its_cmd_block *cmd_base;
111 struct its_cmd_block *cmd_write;
112 struct its_baser tables[GITS_BASER_NR_REGS];
113 struct its_collection *collections;
114 struct fwnode_handle *fwnode_handle;
115 u64 (*get_msi_base)(struct its_device *its_dev);
118 struct list_head its_device_list;
120 unsigned long list_nr;
124 unsigned int msi_domain_flags;
125 u32 pre_its_base; /* for Socionext Synquacer */
127 int vlpi_redist_offset;
130 #define ITS_ITT_ALIGN SZ_256
132 /* The maximum number of VPEID bits supported by VLPI commands */
133 #define ITS_MAX_VPEID_BITS (16)
134 #define ITS_MAX_VPEID (1 << (ITS_MAX_VPEID_BITS))
136 /* Convert page order to size in bytes */
137 #define PAGE_ORDER_TO_SIZE(o) (PAGE_SIZE << (o))
139 struct event_lpi_map {
140 unsigned long *lpi_map;
142 irq_hw_number_t lpi_base;
144 struct mutex vlpi_lock;
146 struct its_vlpi_map *vlpi_maps;
151 * The ITS view of a device - belongs to an ITS, owns an interrupt
152 * translation table, and a list of interrupts. If it some of its
153 * LPIs are injected into a guest (GICv4), the event_map.vm field
154 * indicates which one.
157 struct list_head entry;
158 struct its_node *its;
159 struct event_lpi_map event_map;
168 struct its_device *dev;
169 struct its_vpe **vpes;
173 static LIST_HEAD(its_nodes);
174 static DEFINE_RAW_SPINLOCK(its_lock);
175 static struct rdists *gic_rdists;
176 static struct irq_domain *its_parent;
178 static unsigned long its_list_map;
179 static u16 vmovp_seq_num;
180 static DEFINE_RAW_SPINLOCK(vmovp_lock);
182 static DEFINE_IDA(its_vpeid_ida);
184 #define gic_data_rdist() (raw_cpu_ptr(gic_rdists->rdist))
185 #define gic_data_rdist_cpu(cpu) (per_cpu_ptr(gic_rdists->rdist, cpu))
186 #define gic_data_rdist_rd_base() (gic_data_rdist()->rd_base)
187 #define gic_data_rdist_vlpi_base() (gic_data_rdist_rd_base() + SZ_128K)
189 static struct its_collection *dev_event_to_col(struct its_device *its_dev,
192 struct its_node *its = its_dev->its;
194 return its->collections + its_dev->event_map.col_map[event];
197 static struct its_collection *valid_col(struct its_collection *col)
199 if (WARN_ON_ONCE(col->target_address & GENMASK_ULL(0, 15)))
205 static struct its_vpe *valid_vpe(struct its_node *its, struct its_vpe *vpe)
207 if (valid_col(its->collections + vpe->col_idx))
214 * ITS command descriptors - parameters to be encoded in a command
217 struct its_cmd_desc {
220 struct its_device *dev;
225 struct its_device *dev;
230 struct its_device *dev;
235 struct its_device *dev;
240 struct its_collection *col;
245 struct its_device *dev;
251 struct its_device *dev;
252 struct its_collection *col;
257 struct its_device *dev;
262 struct its_collection *col;
271 struct its_collection *col;
277 struct its_device *dev;
285 struct its_device *dev;
292 struct its_collection *col;
300 * The ITS command block, which is what the ITS actually parses.
302 struct its_cmd_block {
306 #define ITS_CMD_QUEUE_SZ SZ_64K
307 #define ITS_CMD_QUEUE_NR_ENTRIES (ITS_CMD_QUEUE_SZ / sizeof(struct its_cmd_block))
309 typedef struct its_collection *(*its_cmd_builder_t)(struct its_node *,
310 struct its_cmd_block *,
311 struct its_cmd_desc *);
313 typedef struct its_vpe *(*its_cmd_vbuilder_t)(struct its_node *,
314 struct its_cmd_block *,
315 struct its_cmd_desc *);
317 static void its_mask_encode(u64 *raw_cmd, u64 val, int h, int l)
319 u64 mask = GENMASK_ULL(h, l);
321 *raw_cmd |= (val << l) & mask;
324 static void its_encode_cmd(struct its_cmd_block *cmd, u8 cmd_nr)
326 its_mask_encode(&cmd->raw_cmd[0], cmd_nr, 7, 0);
329 static void its_encode_devid(struct its_cmd_block *cmd, u32 devid)
331 its_mask_encode(&cmd->raw_cmd[0], devid, 63, 32);
334 static void its_encode_event_id(struct its_cmd_block *cmd, u32 id)
336 its_mask_encode(&cmd->raw_cmd[1], id, 31, 0);
339 static void its_encode_phys_id(struct its_cmd_block *cmd, u32 phys_id)
341 its_mask_encode(&cmd->raw_cmd[1], phys_id, 63, 32);
344 static void its_encode_size(struct its_cmd_block *cmd, u8 size)
346 its_mask_encode(&cmd->raw_cmd[1], size, 4, 0);
349 static void its_encode_itt(struct its_cmd_block *cmd, u64 itt_addr)
351 its_mask_encode(&cmd->raw_cmd[2], itt_addr >> 8, 51, 8);
354 static void its_encode_valid(struct its_cmd_block *cmd, int valid)
356 its_mask_encode(&cmd->raw_cmd[2], !!valid, 63, 63);
359 static void its_encode_target(struct its_cmd_block *cmd, u64 target_addr)
361 its_mask_encode(&cmd->raw_cmd[2], target_addr >> 16, 51, 16);
364 static void its_encode_collection(struct its_cmd_block *cmd, u16 col)
366 its_mask_encode(&cmd->raw_cmd[2], col, 15, 0);
369 static void its_encode_vpeid(struct its_cmd_block *cmd, u16 vpeid)
371 its_mask_encode(&cmd->raw_cmd[1], vpeid, 47, 32);
374 static void its_encode_virt_id(struct its_cmd_block *cmd, u32 virt_id)
376 its_mask_encode(&cmd->raw_cmd[2], virt_id, 31, 0);
379 static void its_encode_db_phys_id(struct its_cmd_block *cmd, u32 db_phys_id)
381 its_mask_encode(&cmd->raw_cmd[2], db_phys_id, 63, 32);
384 static void its_encode_db_valid(struct its_cmd_block *cmd, bool db_valid)
386 its_mask_encode(&cmd->raw_cmd[2], db_valid, 0, 0);
389 static void its_encode_seq_num(struct its_cmd_block *cmd, u16 seq_num)
391 its_mask_encode(&cmd->raw_cmd[0], seq_num, 47, 32);
394 static void its_encode_its_list(struct its_cmd_block *cmd, u16 its_list)
396 its_mask_encode(&cmd->raw_cmd[1], its_list, 15, 0);
399 static void its_encode_vpt_addr(struct its_cmd_block *cmd, u64 vpt_pa)
401 its_mask_encode(&cmd->raw_cmd[3], vpt_pa >> 16, 51, 16);
404 static void its_encode_vpt_size(struct its_cmd_block *cmd, u8 vpt_size)
406 its_mask_encode(&cmd->raw_cmd[3], vpt_size, 4, 0);
409 static inline void its_fixup_cmd(struct its_cmd_block *cmd)
411 /* Let's fixup BE commands */
412 cmd->raw_cmd[0] = cpu_to_le64(cmd->raw_cmd[0]);
413 cmd->raw_cmd[1] = cpu_to_le64(cmd->raw_cmd[1]);
414 cmd->raw_cmd[2] = cpu_to_le64(cmd->raw_cmd[2]);
415 cmd->raw_cmd[3] = cpu_to_le64(cmd->raw_cmd[3]);
418 static struct its_collection *its_build_mapd_cmd(struct its_node *its,
419 struct its_cmd_block *cmd,
420 struct its_cmd_desc *desc)
422 unsigned long itt_addr;
423 u8 size = ilog2(desc->its_mapd_cmd.dev->nr_ites);
425 itt_addr = virt_to_phys(desc->its_mapd_cmd.dev->itt);
426 itt_addr = ALIGN(itt_addr, ITS_ITT_ALIGN);
428 its_encode_cmd(cmd, GITS_CMD_MAPD);
429 its_encode_devid(cmd, desc->its_mapd_cmd.dev->device_id);
430 its_encode_size(cmd, size - 1);
431 its_encode_itt(cmd, itt_addr);
432 its_encode_valid(cmd, desc->its_mapd_cmd.valid);
439 static struct its_collection *its_build_mapc_cmd(struct its_node *its,
440 struct its_cmd_block *cmd,
441 struct its_cmd_desc *desc)
443 its_encode_cmd(cmd, GITS_CMD_MAPC);
444 its_encode_collection(cmd, desc->its_mapc_cmd.col->col_id);
445 its_encode_target(cmd, desc->its_mapc_cmd.col->target_address);
446 its_encode_valid(cmd, desc->its_mapc_cmd.valid);
450 return desc->its_mapc_cmd.col;
453 static struct its_collection *its_build_mapti_cmd(struct its_node *its,
454 struct its_cmd_block *cmd,
455 struct its_cmd_desc *desc)
457 struct its_collection *col;
459 col = dev_event_to_col(desc->its_mapti_cmd.dev,
460 desc->its_mapti_cmd.event_id);
462 its_encode_cmd(cmd, GITS_CMD_MAPTI);
463 its_encode_devid(cmd, desc->its_mapti_cmd.dev->device_id);
464 its_encode_event_id(cmd, desc->its_mapti_cmd.event_id);
465 its_encode_phys_id(cmd, desc->its_mapti_cmd.phys_id);
466 its_encode_collection(cmd, col->col_id);
470 return valid_col(col);
473 static struct its_collection *its_build_movi_cmd(struct its_node *its,
474 struct its_cmd_block *cmd,
475 struct its_cmd_desc *desc)
477 struct its_collection *col;
479 col = dev_event_to_col(desc->its_movi_cmd.dev,
480 desc->its_movi_cmd.event_id);
482 its_encode_cmd(cmd, GITS_CMD_MOVI);
483 its_encode_devid(cmd, desc->its_movi_cmd.dev->device_id);
484 its_encode_event_id(cmd, desc->its_movi_cmd.event_id);
485 its_encode_collection(cmd, desc->its_movi_cmd.col->col_id);
489 return valid_col(col);
492 static struct its_collection *its_build_discard_cmd(struct its_node *its,
493 struct its_cmd_block *cmd,
494 struct its_cmd_desc *desc)
496 struct its_collection *col;
498 col = dev_event_to_col(desc->its_discard_cmd.dev,
499 desc->its_discard_cmd.event_id);
501 its_encode_cmd(cmd, GITS_CMD_DISCARD);
502 its_encode_devid(cmd, desc->its_discard_cmd.dev->device_id);
503 its_encode_event_id(cmd, desc->its_discard_cmd.event_id);
507 return valid_col(col);
510 static struct its_collection *its_build_inv_cmd(struct its_node *its,
511 struct its_cmd_block *cmd,
512 struct its_cmd_desc *desc)
514 struct its_collection *col;
516 col = dev_event_to_col(desc->its_inv_cmd.dev,
517 desc->its_inv_cmd.event_id);
519 its_encode_cmd(cmd, GITS_CMD_INV);
520 its_encode_devid(cmd, desc->its_inv_cmd.dev->device_id);
521 its_encode_event_id(cmd, desc->its_inv_cmd.event_id);
525 return valid_col(col);
528 static struct its_collection *its_build_int_cmd(struct its_node *its,
529 struct its_cmd_block *cmd,
530 struct its_cmd_desc *desc)
532 struct its_collection *col;
534 col = dev_event_to_col(desc->its_int_cmd.dev,
535 desc->its_int_cmd.event_id);
537 its_encode_cmd(cmd, GITS_CMD_INT);
538 its_encode_devid(cmd, desc->its_int_cmd.dev->device_id);
539 its_encode_event_id(cmd, desc->its_int_cmd.event_id);
543 return valid_col(col);
546 static struct its_collection *its_build_clear_cmd(struct its_node *its,
547 struct its_cmd_block *cmd,
548 struct its_cmd_desc *desc)
550 struct its_collection *col;
552 col = dev_event_to_col(desc->its_clear_cmd.dev,
553 desc->its_clear_cmd.event_id);
555 its_encode_cmd(cmd, GITS_CMD_CLEAR);
556 its_encode_devid(cmd, desc->its_clear_cmd.dev->device_id);
557 its_encode_event_id(cmd, desc->its_clear_cmd.event_id);
561 return valid_col(col);
564 static struct its_collection *its_build_invall_cmd(struct its_node *its,
565 struct its_cmd_block *cmd,
566 struct its_cmd_desc *desc)
568 its_encode_cmd(cmd, GITS_CMD_INVALL);
569 its_encode_collection(cmd, desc->its_mapc_cmd.col->col_id);
576 static struct its_vpe *its_build_vinvall_cmd(struct its_node *its,
577 struct its_cmd_block *cmd,
578 struct its_cmd_desc *desc)
580 its_encode_cmd(cmd, GITS_CMD_VINVALL);
581 its_encode_vpeid(cmd, desc->its_vinvall_cmd.vpe->vpe_id);
585 return valid_vpe(its, desc->its_vinvall_cmd.vpe);
588 static struct its_vpe *its_build_vmapp_cmd(struct its_node *its,
589 struct its_cmd_block *cmd,
590 struct its_cmd_desc *desc)
592 unsigned long vpt_addr;
595 vpt_addr = virt_to_phys(page_address(desc->its_vmapp_cmd.vpe->vpt_page));
596 target = desc->its_vmapp_cmd.col->target_address + its->vlpi_redist_offset;
598 its_encode_cmd(cmd, GITS_CMD_VMAPP);
599 its_encode_vpeid(cmd, desc->its_vmapp_cmd.vpe->vpe_id);
600 its_encode_valid(cmd, desc->its_vmapp_cmd.valid);
601 its_encode_target(cmd, target);
602 its_encode_vpt_addr(cmd, vpt_addr);
603 its_encode_vpt_size(cmd, LPI_NRBITS - 1);
607 return valid_vpe(its, desc->its_vmapp_cmd.vpe);
610 static struct its_vpe *its_build_vmapti_cmd(struct its_node *its,
611 struct its_cmd_block *cmd,
612 struct its_cmd_desc *desc)
616 if (desc->its_vmapti_cmd.db_enabled)
617 db = desc->its_vmapti_cmd.vpe->vpe_db_lpi;
621 its_encode_cmd(cmd, GITS_CMD_VMAPTI);
622 its_encode_devid(cmd, desc->its_vmapti_cmd.dev->device_id);
623 its_encode_vpeid(cmd, desc->its_vmapti_cmd.vpe->vpe_id);
624 its_encode_event_id(cmd, desc->its_vmapti_cmd.event_id);
625 its_encode_db_phys_id(cmd, db);
626 its_encode_virt_id(cmd, desc->its_vmapti_cmd.virt_id);
630 return valid_vpe(its, desc->its_vmapti_cmd.vpe);
633 static struct its_vpe *its_build_vmovi_cmd(struct its_node *its,
634 struct its_cmd_block *cmd,
635 struct its_cmd_desc *desc)
639 if (desc->its_vmovi_cmd.db_enabled)
640 db = desc->its_vmovi_cmd.vpe->vpe_db_lpi;
644 its_encode_cmd(cmd, GITS_CMD_VMOVI);
645 its_encode_devid(cmd, desc->its_vmovi_cmd.dev->device_id);
646 its_encode_vpeid(cmd, desc->its_vmovi_cmd.vpe->vpe_id);
647 its_encode_event_id(cmd, desc->its_vmovi_cmd.event_id);
648 its_encode_db_phys_id(cmd, db);
649 its_encode_db_valid(cmd, true);
653 return valid_vpe(its, desc->its_vmovi_cmd.vpe);
656 static struct its_vpe *its_build_vmovp_cmd(struct its_node *its,
657 struct its_cmd_block *cmd,
658 struct its_cmd_desc *desc)
662 target = desc->its_vmovp_cmd.col->target_address + its->vlpi_redist_offset;
663 its_encode_cmd(cmd, GITS_CMD_VMOVP);
664 its_encode_seq_num(cmd, desc->its_vmovp_cmd.seq_num);
665 its_encode_its_list(cmd, desc->its_vmovp_cmd.its_list);
666 its_encode_vpeid(cmd, desc->its_vmovp_cmd.vpe->vpe_id);
667 its_encode_target(cmd, target);
671 return valid_vpe(its, desc->its_vmovp_cmd.vpe);
674 static u64 its_cmd_ptr_to_offset(struct its_node *its,
675 struct its_cmd_block *ptr)
677 return (ptr - its->cmd_base) * sizeof(*ptr);
680 static int its_queue_full(struct its_node *its)
685 widx = its->cmd_write - its->cmd_base;
686 ridx = readl_relaxed(its->base + GITS_CREADR) / sizeof(struct its_cmd_block);
688 /* This is incredibly unlikely to happen, unless the ITS locks up. */
689 if (((widx + 1) % ITS_CMD_QUEUE_NR_ENTRIES) == ridx)
695 static struct its_cmd_block *its_allocate_entry(struct its_node *its)
697 struct its_cmd_block *cmd;
698 u32 count = 1000000; /* 1s! */
700 while (its_queue_full(its)) {
703 pr_err_ratelimited("ITS queue not draining\n");
710 cmd = its->cmd_write++;
712 /* Handle queue wrapping */
713 if (its->cmd_write == (its->cmd_base + ITS_CMD_QUEUE_NR_ENTRIES))
714 its->cmd_write = its->cmd_base;
725 static struct its_cmd_block *its_post_commands(struct its_node *its)
727 u64 wr = its_cmd_ptr_to_offset(its, its->cmd_write);
729 writel_relaxed(wr, its->base + GITS_CWRITER);
731 return its->cmd_write;
734 static void its_flush_cmd(struct its_node *its, struct its_cmd_block *cmd)
737 * Make sure the commands written to memory are observable by
740 if (its->flags & ITS_FLAGS_CMDQ_NEEDS_FLUSHING)
741 gic_flush_dcache_to_poc(cmd, sizeof(*cmd));
746 static int its_wait_for_range_completion(struct its_node *its,
747 struct its_cmd_block *from,
748 struct its_cmd_block *to)
750 u64 rd_idx, from_idx, to_idx;
751 u32 count = 1000000; /* 1s! */
753 from_idx = its_cmd_ptr_to_offset(its, from);
754 to_idx = its_cmd_ptr_to_offset(its, to);
757 rd_idx = readl_relaxed(its->base + GITS_CREADR);
760 if (from_idx < to_idx && rd_idx >= to_idx)
764 if (from_idx >= to_idx && rd_idx >= to_idx && rd_idx < from_idx)
769 pr_err_ratelimited("ITS queue timeout (%llu %llu %llu)\n",
770 from_idx, to_idx, rd_idx);
780 /* Warning, macro hell follows */
781 #define BUILD_SINGLE_CMD_FUNC(name, buildtype, synctype, buildfn) \
782 void name(struct its_node *its, \
784 struct its_cmd_desc *desc) \
786 struct its_cmd_block *cmd, *sync_cmd, *next_cmd; \
787 synctype *sync_obj; \
788 unsigned long flags; \
790 raw_spin_lock_irqsave(&its->lock, flags); \
792 cmd = its_allocate_entry(its); \
793 if (!cmd) { /* We're soooooo screewed... */ \
794 raw_spin_unlock_irqrestore(&its->lock, flags); \
797 sync_obj = builder(its, cmd, desc); \
798 its_flush_cmd(its, cmd); \
801 sync_cmd = its_allocate_entry(its); \
805 buildfn(its, sync_cmd, sync_obj); \
806 its_flush_cmd(its, sync_cmd); \
810 next_cmd = its_post_commands(its); \
811 raw_spin_unlock_irqrestore(&its->lock, flags); \
813 if (its_wait_for_range_completion(its, cmd, next_cmd)) \
814 pr_err_ratelimited("ITS cmd %ps failed\n", builder); \
817 static void its_build_sync_cmd(struct its_node *its,
818 struct its_cmd_block *sync_cmd,
819 struct its_collection *sync_col)
821 its_encode_cmd(sync_cmd, GITS_CMD_SYNC);
822 its_encode_target(sync_cmd, sync_col->target_address);
824 its_fixup_cmd(sync_cmd);
827 static BUILD_SINGLE_CMD_FUNC(its_send_single_command, its_cmd_builder_t,
828 struct its_collection, its_build_sync_cmd)
830 static void its_build_vsync_cmd(struct its_node *its,
831 struct its_cmd_block *sync_cmd,
832 struct its_vpe *sync_vpe)
834 its_encode_cmd(sync_cmd, GITS_CMD_VSYNC);
835 its_encode_vpeid(sync_cmd, sync_vpe->vpe_id);
837 its_fixup_cmd(sync_cmd);
840 static BUILD_SINGLE_CMD_FUNC(its_send_single_vcommand, its_cmd_vbuilder_t,
841 struct its_vpe, its_build_vsync_cmd)
843 static void its_send_int(struct its_device *dev, u32 event_id)
845 struct its_cmd_desc desc;
847 desc.its_int_cmd.dev = dev;
848 desc.its_int_cmd.event_id = event_id;
850 its_send_single_command(dev->its, its_build_int_cmd, &desc);
853 static void its_send_clear(struct its_device *dev, u32 event_id)
855 struct its_cmd_desc desc;
857 desc.its_clear_cmd.dev = dev;
858 desc.its_clear_cmd.event_id = event_id;
860 its_send_single_command(dev->its, its_build_clear_cmd, &desc);
863 static void its_send_inv(struct its_device *dev, u32 event_id)
865 struct its_cmd_desc desc;
867 desc.its_inv_cmd.dev = dev;
868 desc.its_inv_cmd.event_id = event_id;
870 its_send_single_command(dev->its, its_build_inv_cmd, &desc);
873 static void its_send_mapd(struct its_device *dev, int valid)
875 struct its_cmd_desc desc;
877 desc.its_mapd_cmd.dev = dev;
878 desc.its_mapd_cmd.valid = !!valid;
880 its_send_single_command(dev->its, its_build_mapd_cmd, &desc);
883 static void its_send_mapc(struct its_node *its, struct its_collection *col,
886 struct its_cmd_desc desc;
888 desc.its_mapc_cmd.col = col;
889 desc.its_mapc_cmd.valid = !!valid;
891 its_send_single_command(its, its_build_mapc_cmd, &desc);
894 static void its_send_mapti(struct its_device *dev, u32 irq_id, u32 id)
896 struct its_cmd_desc desc;
898 desc.its_mapti_cmd.dev = dev;
899 desc.its_mapti_cmd.phys_id = irq_id;
900 desc.its_mapti_cmd.event_id = id;
902 its_send_single_command(dev->its, its_build_mapti_cmd, &desc);
905 static void its_send_movi(struct its_device *dev,
906 struct its_collection *col, u32 id)
908 struct its_cmd_desc desc;
910 desc.its_movi_cmd.dev = dev;
911 desc.its_movi_cmd.col = col;
912 desc.its_movi_cmd.event_id = id;
914 its_send_single_command(dev->its, its_build_movi_cmd, &desc);
917 static void its_send_discard(struct its_device *dev, u32 id)
919 struct its_cmd_desc desc;
921 desc.its_discard_cmd.dev = dev;
922 desc.its_discard_cmd.event_id = id;
924 its_send_single_command(dev->its, its_build_discard_cmd, &desc);
927 static void its_send_invall(struct its_node *its, struct its_collection *col)
929 struct its_cmd_desc desc;
931 desc.its_invall_cmd.col = col;
933 its_send_single_command(its, its_build_invall_cmd, &desc);
936 static void its_send_vmapti(struct its_device *dev, u32 id)
938 struct its_vlpi_map *map = &dev->event_map.vlpi_maps[id];
939 struct its_cmd_desc desc;
941 desc.its_vmapti_cmd.vpe = map->vpe;
942 desc.its_vmapti_cmd.dev = dev;
943 desc.its_vmapti_cmd.virt_id = map->vintid;
944 desc.its_vmapti_cmd.event_id = id;
945 desc.its_vmapti_cmd.db_enabled = map->db_enabled;
947 its_send_single_vcommand(dev->its, its_build_vmapti_cmd, &desc);
950 static void its_send_vmovi(struct its_device *dev, u32 id)
952 struct its_vlpi_map *map = &dev->event_map.vlpi_maps[id];
953 struct its_cmd_desc desc;
955 desc.its_vmovi_cmd.vpe = map->vpe;
956 desc.its_vmovi_cmd.dev = dev;
957 desc.its_vmovi_cmd.event_id = id;
958 desc.its_vmovi_cmd.db_enabled = map->db_enabled;
960 its_send_single_vcommand(dev->its, its_build_vmovi_cmd, &desc);
963 static void its_send_vmapp(struct its_node *its,
964 struct its_vpe *vpe, bool valid)
966 struct its_cmd_desc desc;
968 desc.its_vmapp_cmd.vpe = vpe;
969 desc.its_vmapp_cmd.valid = valid;
970 desc.its_vmapp_cmd.col = &its->collections[vpe->col_idx];
972 its_send_single_vcommand(its, its_build_vmapp_cmd, &desc);
975 static void its_send_vmovp(struct its_vpe *vpe)
977 struct its_cmd_desc desc;
978 struct its_node *its;
980 int col_id = vpe->col_idx;
982 desc.its_vmovp_cmd.vpe = vpe;
983 desc.its_vmovp_cmd.its_list = (u16)its_list_map;
986 its = list_first_entry(&its_nodes, struct its_node, entry);
987 desc.its_vmovp_cmd.seq_num = 0;
988 desc.its_vmovp_cmd.col = &its->collections[col_id];
989 its_send_single_vcommand(its, its_build_vmovp_cmd, &desc);
994 * Yet another marvel of the architecture. If using the
995 * its_list "feature", we need to make sure that all ITSs
996 * receive all VMOVP commands in the same order. The only way
997 * to guarantee this is to make vmovp a serialization point.
1001 raw_spin_lock_irqsave(&vmovp_lock, flags);
1003 desc.its_vmovp_cmd.seq_num = vmovp_seq_num++;
1006 list_for_each_entry(its, &its_nodes, entry) {
1010 if (!vpe->its_vm->vlpi_count[its->list_nr])
1013 desc.its_vmovp_cmd.col = &its->collections[col_id];
1014 its_send_single_vcommand(its, its_build_vmovp_cmd, &desc);
1017 raw_spin_unlock_irqrestore(&vmovp_lock, flags);
1020 static void its_send_vinvall(struct its_node *its, struct its_vpe *vpe)
1022 struct its_cmd_desc desc;
1024 desc.its_vinvall_cmd.vpe = vpe;
1025 its_send_single_vcommand(its, its_build_vinvall_cmd, &desc);
1029 * irqchip functions - assumes MSI, mostly.
1032 static inline u32 its_get_event_id(struct irq_data *d)
1034 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1035 return d->hwirq - its_dev->event_map.lpi_base;
1038 static void lpi_write_config(struct irq_data *d, u8 clr, u8 set)
1040 irq_hw_number_t hwirq;
1044 if (irqd_is_forwarded_to_vcpu(d)) {
1045 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1046 u32 event = its_get_event_id(d);
1047 struct its_vlpi_map *map;
1049 va = page_address(its_dev->event_map.vm->vprop_page);
1050 map = &its_dev->event_map.vlpi_maps[event];
1051 hwirq = map->vintid;
1053 /* Remember the updated property */
1054 map->properties &= ~clr;
1055 map->properties |= set | LPI_PROP_GROUP1;
1057 va = gic_rdists->prop_table_va;
1061 cfg = va + hwirq - 8192;
1063 *cfg |= set | LPI_PROP_GROUP1;
1066 * Make the above write visible to the redistributors.
1067 * And yes, we're flushing exactly: One. Single. Byte.
1070 if (gic_rdists->flags & RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING)
1071 gic_flush_dcache_to_poc(cfg, sizeof(*cfg));
1076 static void lpi_update_config(struct irq_data *d, u8 clr, u8 set)
1078 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1080 lpi_write_config(d, clr, set);
1081 its_send_inv(its_dev, its_get_event_id(d));
1084 static void its_vlpi_set_doorbell(struct irq_data *d, bool enable)
1086 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1087 u32 event = its_get_event_id(d);
1089 if (its_dev->event_map.vlpi_maps[event].db_enabled == enable)
1092 its_dev->event_map.vlpi_maps[event].db_enabled = enable;
1095 * More fun with the architecture:
1097 * Ideally, we'd issue a VMAPTI to set the doorbell to its LPI
1098 * value or to 1023, depending on the enable bit. But that
1099 * would be issueing a mapping for an /existing/ DevID+EventID
1100 * pair, which is UNPREDICTABLE. Instead, let's issue a VMOVI
1101 * to the /same/ vPE, using this opportunity to adjust the
1102 * doorbell. Mouahahahaha. We loves it, Precious.
1104 its_send_vmovi(its_dev, event);
1107 static void its_mask_irq(struct irq_data *d)
1109 if (irqd_is_forwarded_to_vcpu(d))
1110 its_vlpi_set_doorbell(d, false);
1112 lpi_update_config(d, LPI_PROP_ENABLED, 0);
1115 static void its_unmask_irq(struct irq_data *d)
1117 if (irqd_is_forwarded_to_vcpu(d))
1118 its_vlpi_set_doorbell(d, true);
1120 lpi_update_config(d, 0, LPI_PROP_ENABLED);
1123 static int its_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
1127 const struct cpumask *cpu_mask = cpu_online_mask;
1128 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1129 struct its_collection *target_col;
1130 u32 id = its_get_event_id(d);
1132 /* A forwarded interrupt should use irq_set_vcpu_affinity */
1133 if (irqd_is_forwarded_to_vcpu(d))
1136 /* lpi cannot be routed to a redistributor that is on a foreign node */
1137 if (its_dev->its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_23144) {
1138 if (its_dev->its->numa_node >= 0) {
1139 cpu_mask = cpumask_of_node(its_dev->its->numa_node);
1140 if (!cpumask_intersects(mask_val, cpu_mask))
1145 cpu = cpumask_any_and(mask_val, cpu_mask);
1147 if (cpu >= nr_cpu_ids)
1150 /* don't set the affinity when the target cpu is same as current one */
1151 if (cpu != its_dev->event_map.col_map[id]) {
1152 target_col = &its_dev->its->collections[cpu];
1153 its_send_movi(its_dev, target_col, id);
1154 its_dev->event_map.col_map[id] = cpu;
1155 irq_data_update_effective_affinity(d, cpumask_of(cpu));
1158 return IRQ_SET_MASK_OK_DONE;
1161 static u64 its_irq_get_msi_base(struct its_device *its_dev)
1163 struct its_node *its = its_dev->its;
1165 return its->phys_base + GITS_TRANSLATER;
1168 static void its_irq_compose_msi_msg(struct irq_data *d, struct msi_msg *msg)
1170 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1171 struct its_node *its;
1175 addr = its->get_msi_base(its_dev);
1177 msg->address_lo = lower_32_bits(addr);
1178 msg->address_hi = upper_32_bits(addr);
1179 msg->data = its_get_event_id(d);
1181 iommu_dma_compose_msi_msg(irq_data_get_msi_desc(d), msg);
1184 static int its_irq_set_irqchip_state(struct irq_data *d,
1185 enum irqchip_irq_state which,
1188 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1189 u32 event = its_get_event_id(d);
1191 if (which != IRQCHIP_STATE_PENDING)
1195 its_send_int(its_dev, event);
1197 its_send_clear(its_dev, event);
1202 static void its_map_vm(struct its_node *its, struct its_vm *vm)
1204 unsigned long flags;
1206 /* Not using the ITS list? Everything is always mapped. */
1210 raw_spin_lock_irqsave(&vmovp_lock, flags);
1213 * If the VM wasn't mapped yet, iterate over the vpes and get
1216 vm->vlpi_count[its->list_nr]++;
1218 if (vm->vlpi_count[its->list_nr] == 1) {
1221 for (i = 0; i < vm->nr_vpes; i++) {
1222 struct its_vpe *vpe = vm->vpes[i];
1223 struct irq_data *d = irq_get_irq_data(vpe->irq);
1225 /* Map the VPE to the first possible CPU */
1226 vpe->col_idx = cpumask_first(cpu_online_mask);
1227 its_send_vmapp(its, vpe, true);
1228 its_send_vinvall(its, vpe);
1229 irq_data_update_effective_affinity(d, cpumask_of(vpe->col_idx));
1233 raw_spin_unlock_irqrestore(&vmovp_lock, flags);
1236 static void its_unmap_vm(struct its_node *its, struct its_vm *vm)
1238 unsigned long flags;
1240 /* Not using the ITS list? Everything is always mapped. */
1244 raw_spin_lock_irqsave(&vmovp_lock, flags);
1246 if (!--vm->vlpi_count[its->list_nr]) {
1249 for (i = 0; i < vm->nr_vpes; i++)
1250 its_send_vmapp(its, vm->vpes[i], false);
1253 raw_spin_unlock_irqrestore(&vmovp_lock, flags);
1256 static int its_vlpi_map(struct irq_data *d, struct its_cmd_info *info)
1258 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1259 u32 event = its_get_event_id(d);
1265 mutex_lock(&its_dev->event_map.vlpi_lock);
1267 if (!its_dev->event_map.vm) {
1268 struct its_vlpi_map *maps;
1270 maps = kcalloc(its_dev->event_map.nr_lpis, sizeof(*maps),
1277 its_dev->event_map.vm = info->map->vm;
1278 its_dev->event_map.vlpi_maps = maps;
1279 } else if (its_dev->event_map.vm != info->map->vm) {
1284 /* Get our private copy of the mapping information */
1285 its_dev->event_map.vlpi_maps[event] = *info->map;
1287 if (irqd_is_forwarded_to_vcpu(d)) {
1288 /* Already mapped, move it around */
1289 its_send_vmovi(its_dev, event);
1291 /* Ensure all the VPEs are mapped on this ITS */
1292 its_map_vm(its_dev->its, info->map->vm);
1295 * Flag the interrupt as forwarded so that we can
1296 * start poking the virtual property table.
1298 irqd_set_forwarded_to_vcpu(d);
1300 /* Write out the property to the prop table */
1301 lpi_write_config(d, 0xff, info->map->properties);
1303 /* Drop the physical mapping */
1304 its_send_discard(its_dev, event);
1306 /* and install the virtual one */
1307 its_send_vmapti(its_dev, event);
1309 /* Increment the number of VLPIs */
1310 its_dev->event_map.nr_vlpis++;
1314 mutex_unlock(&its_dev->event_map.vlpi_lock);
1318 static int its_vlpi_get(struct irq_data *d, struct its_cmd_info *info)
1320 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1321 u32 event = its_get_event_id(d);
1324 mutex_lock(&its_dev->event_map.vlpi_lock);
1326 if (!its_dev->event_map.vm ||
1327 !its_dev->event_map.vlpi_maps[event].vm) {
1332 /* Copy our mapping information to the incoming request */
1333 *info->map = its_dev->event_map.vlpi_maps[event];
1336 mutex_unlock(&its_dev->event_map.vlpi_lock);
1340 static int its_vlpi_unmap(struct irq_data *d)
1342 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1343 u32 event = its_get_event_id(d);
1346 mutex_lock(&its_dev->event_map.vlpi_lock);
1348 if (!its_dev->event_map.vm || !irqd_is_forwarded_to_vcpu(d)) {
1353 /* Drop the virtual mapping */
1354 its_send_discard(its_dev, event);
1356 /* and restore the physical one */
1357 irqd_clr_forwarded_to_vcpu(d);
1358 its_send_mapti(its_dev, d->hwirq, event);
1359 lpi_update_config(d, 0xff, (LPI_PROP_DEFAULT_PRIO |
1363 /* Potentially unmap the VM from this ITS */
1364 its_unmap_vm(its_dev->its, its_dev->event_map.vm);
1367 * Drop the refcount and make the device available again if
1368 * this was the last VLPI.
1370 if (!--its_dev->event_map.nr_vlpis) {
1371 its_dev->event_map.vm = NULL;
1372 kfree(its_dev->event_map.vlpi_maps);
1376 mutex_unlock(&its_dev->event_map.vlpi_lock);
1380 static int its_vlpi_prop_update(struct irq_data *d, struct its_cmd_info *info)
1382 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1384 if (!its_dev->event_map.vm || !irqd_is_forwarded_to_vcpu(d))
1387 if (info->cmd_type == PROP_UPDATE_AND_INV_VLPI)
1388 lpi_update_config(d, 0xff, info->config);
1390 lpi_write_config(d, 0xff, info->config);
1391 its_vlpi_set_doorbell(d, !!(info->config & LPI_PROP_ENABLED));
1396 static int its_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
1398 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1399 struct its_cmd_info *info = vcpu_info;
1402 if (!its_dev->its->is_v4)
1405 /* Unmap request? */
1407 return its_vlpi_unmap(d);
1409 switch (info->cmd_type) {
1411 return its_vlpi_map(d, info);
1414 return its_vlpi_get(d, info);
1416 case PROP_UPDATE_VLPI:
1417 case PROP_UPDATE_AND_INV_VLPI:
1418 return its_vlpi_prop_update(d, info);
1425 static struct irq_chip its_irq_chip = {
1427 .irq_mask = its_mask_irq,
1428 .irq_unmask = its_unmask_irq,
1429 .irq_eoi = irq_chip_eoi_parent,
1430 .irq_set_affinity = its_set_affinity,
1431 .irq_compose_msi_msg = its_irq_compose_msi_msg,
1432 .irq_set_irqchip_state = its_irq_set_irqchip_state,
1433 .irq_set_vcpu_affinity = its_irq_set_vcpu_affinity,
1438 * How we allocate LPIs:
1440 * lpi_range_list contains ranges of LPIs that are to available to
1441 * allocate from. To allocate LPIs, just pick the first range that
1442 * fits the required allocation, and reduce it by the required
1443 * amount. Once empty, remove the range from the list.
1445 * To free a range of LPIs, add a free range to the list, sort it and
1446 * merge the result if the new range happens to be adjacent to an
1447 * already free block.
1449 * The consequence of the above is that allocation is cost is low, but
1450 * freeing is expensive. We assumes that freeing rarely occurs.
1452 #define ITS_MAX_LPI_NRBITS 16 /* 64K LPIs */
1454 static DEFINE_MUTEX(lpi_range_lock);
1455 static LIST_HEAD(lpi_range_list);
1458 struct list_head entry;
1463 static struct lpi_range *mk_lpi_range(u32 base, u32 span)
1465 struct lpi_range *range;
1467 range = kmalloc(sizeof(*range), GFP_KERNEL);
1469 range->base_id = base;
1476 static int alloc_lpi_range(u32 nr_lpis, u32 *base)
1478 struct lpi_range *range, *tmp;
1481 mutex_lock(&lpi_range_lock);
1483 list_for_each_entry_safe(range, tmp, &lpi_range_list, entry) {
1484 if (range->span >= nr_lpis) {
1485 *base = range->base_id;
1486 range->base_id += nr_lpis;
1487 range->span -= nr_lpis;
1489 if (range->span == 0) {
1490 list_del(&range->entry);
1499 mutex_unlock(&lpi_range_lock);
1501 pr_debug("ITS: alloc %u:%u\n", *base, nr_lpis);
1505 static void merge_lpi_ranges(struct lpi_range *a, struct lpi_range *b)
1507 if (&a->entry == &lpi_range_list || &b->entry == &lpi_range_list)
1509 if (a->base_id + a->span != b->base_id)
1511 b->base_id = a->base_id;
1513 list_del(&a->entry);
1517 static int free_lpi_range(u32 base, u32 nr_lpis)
1519 struct lpi_range *new, *old;
1521 new = mk_lpi_range(base, nr_lpis);
1525 mutex_lock(&lpi_range_lock);
1527 list_for_each_entry_reverse(old, &lpi_range_list, entry) {
1528 if (old->base_id < base)
1532 * old is the last element with ->base_id smaller than base,
1533 * so new goes right after it. If there are no elements with
1534 * ->base_id smaller than base, &old->entry ends up pointing
1535 * at the head of the list, and inserting new it the start of
1536 * the list is the right thing to do in that case as well.
1538 list_add(&new->entry, &old->entry);
1540 * Now check if we can merge with the preceding and/or
1543 merge_lpi_ranges(old, new);
1544 merge_lpi_ranges(new, list_next_entry(new, entry));
1546 mutex_unlock(&lpi_range_lock);
1550 static int __init its_lpi_init(u32 id_bits)
1552 u32 lpis = (1UL << id_bits) - 8192;
1556 numlpis = 1UL << GICD_TYPER_NUM_LPIS(gic_rdists->gicd_typer);
1558 if (numlpis > 2 && !WARN_ON(numlpis > lpis)) {
1560 pr_info("ITS: Using hypervisor restricted LPI range [%u]\n",
1565 * Initializing the allocator is just the same as freeing the
1566 * full range of LPIs.
1568 err = free_lpi_range(8192, lpis);
1569 pr_debug("ITS: Allocator initialized for %u LPIs\n", lpis);
1573 static unsigned long *its_lpi_alloc(int nr_irqs, u32 *base, int *nr_ids)
1575 unsigned long *bitmap = NULL;
1579 err = alloc_lpi_range(nr_irqs, base);
1584 } while (nr_irqs > 0);
1592 bitmap = kcalloc(BITS_TO_LONGS(nr_irqs), sizeof (long), GFP_ATOMIC);
1600 *base = *nr_ids = 0;
1605 static void its_lpi_free(unsigned long *bitmap, u32 base, u32 nr_ids)
1607 WARN_ON(free_lpi_range(base, nr_ids));
1611 static void gic_reset_prop_table(void *va)
1613 /* Priority 0xa0, Group-1, disabled */
1614 memset(va, LPI_PROP_DEFAULT_PRIO | LPI_PROP_GROUP1, LPI_PROPBASE_SZ);
1616 /* Make sure the GIC will observe the written configuration */
1617 gic_flush_dcache_to_poc(va, LPI_PROPBASE_SZ);
1620 static struct page *its_allocate_prop_table(gfp_t gfp_flags)
1622 struct page *prop_page;
1624 prop_page = alloc_pages(gfp_flags, get_order(LPI_PROPBASE_SZ));
1628 gic_reset_prop_table(page_address(prop_page));
1633 static void its_free_prop_table(struct page *prop_page)
1635 free_pages((unsigned long)page_address(prop_page),
1636 get_order(LPI_PROPBASE_SZ));
1639 static bool gic_check_reserved_range(phys_addr_t addr, unsigned long size)
1641 phys_addr_t start, end, addr_end;
1645 * We don't bother checking for a kdump kernel as by
1646 * construction, the LPI tables are out of this kernel's
1649 if (is_kdump_kernel())
1652 addr_end = addr + size - 1;
1654 for_each_reserved_mem_region(i, &start, &end) {
1655 if (addr >= start && addr_end <= end)
1659 /* Not found, not a good sign... */
1660 pr_warn("GICv3: Expected reserved range [%pa:%pa], not found\n",
1662 add_taint(TAINT_CRAP, LOCKDEP_STILL_OK);
1666 static int gic_reserve_range(phys_addr_t addr, unsigned long size)
1668 if (efi_enabled(EFI_CONFIG_TABLES))
1669 return efi_mem_reserve_persistent(addr, size);
1674 static int __init its_setup_lpi_prop_table(void)
1676 if (gic_rdists->flags & RDIST_FLAGS_RD_TABLES_PREALLOCATED) {
1679 val = gicr_read_propbaser(gic_data_rdist_rd_base() + GICR_PROPBASER);
1680 lpi_id_bits = (val & GICR_PROPBASER_IDBITS_MASK) + 1;
1682 gic_rdists->prop_table_pa = val & GENMASK_ULL(51, 12);
1683 gic_rdists->prop_table_va = memremap(gic_rdists->prop_table_pa,
1686 gic_reset_prop_table(gic_rdists->prop_table_va);
1690 lpi_id_bits = min_t(u32,
1691 GICD_TYPER_ID_BITS(gic_rdists->gicd_typer),
1692 ITS_MAX_LPI_NRBITS);
1693 page = its_allocate_prop_table(GFP_NOWAIT);
1695 pr_err("Failed to allocate PROPBASE\n");
1699 gic_rdists->prop_table_pa = page_to_phys(page);
1700 gic_rdists->prop_table_va = page_address(page);
1701 WARN_ON(gic_reserve_range(gic_rdists->prop_table_pa,
1705 pr_info("GICv3: using LPI property table @%pa\n",
1706 &gic_rdists->prop_table_pa);
1708 return its_lpi_init(lpi_id_bits);
1711 static const char *its_base_type_string[] = {
1712 [GITS_BASER_TYPE_DEVICE] = "Devices",
1713 [GITS_BASER_TYPE_VCPU] = "Virtual CPUs",
1714 [GITS_BASER_TYPE_RESERVED3] = "Reserved (3)",
1715 [GITS_BASER_TYPE_COLLECTION] = "Interrupt Collections",
1716 [GITS_BASER_TYPE_RESERVED5] = "Reserved (5)",
1717 [GITS_BASER_TYPE_RESERVED6] = "Reserved (6)",
1718 [GITS_BASER_TYPE_RESERVED7] = "Reserved (7)",
1721 static u64 its_read_baser(struct its_node *its, struct its_baser *baser)
1723 u32 idx = baser - its->tables;
1725 return gits_read_baser(its->base + GITS_BASER + (idx << 3));
1728 static void its_write_baser(struct its_node *its, struct its_baser *baser,
1731 u32 idx = baser - its->tables;
1733 gits_write_baser(val, its->base + GITS_BASER + (idx << 3));
1734 baser->val = its_read_baser(its, baser);
1737 static int its_setup_baser(struct its_node *its, struct its_baser *baser,
1738 u64 cache, u64 shr, u32 psz, u32 order,
1741 u64 val = its_read_baser(its, baser);
1742 u64 esz = GITS_BASER_ENTRY_SIZE(val);
1743 u64 type = GITS_BASER_TYPE(val);
1744 u64 baser_phys, tmp;
1750 alloc_pages = (PAGE_ORDER_TO_SIZE(order) / psz);
1751 if (alloc_pages > GITS_BASER_PAGES_MAX) {
1752 pr_warn("ITS@%pa: %s too large, reduce ITS pages %u->%u\n",
1753 &its->phys_base, its_base_type_string[type],
1754 alloc_pages, GITS_BASER_PAGES_MAX);
1755 alloc_pages = GITS_BASER_PAGES_MAX;
1756 order = get_order(GITS_BASER_PAGES_MAX * psz);
1759 page = alloc_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO, order);
1763 base = (void *)page_address(page);
1764 baser_phys = virt_to_phys(base);
1766 /* Check if the physical address of the memory is above 48bits */
1767 if (IS_ENABLED(CONFIG_ARM64_64K_PAGES) && (baser_phys >> 48)) {
1769 /* 52bit PA is supported only when PageSize=64K */
1770 if (psz != SZ_64K) {
1771 pr_err("ITS: no 52bit PA support when psz=%d\n", psz);
1772 free_pages((unsigned long)base, order);
1776 /* Convert 52bit PA to 48bit field */
1777 baser_phys = GITS_BASER_PHYS_52_to_48(baser_phys);
1782 (type << GITS_BASER_TYPE_SHIFT) |
1783 ((esz - 1) << GITS_BASER_ENTRY_SIZE_SHIFT) |
1784 ((alloc_pages - 1) << GITS_BASER_PAGES_SHIFT) |
1789 val |= indirect ? GITS_BASER_INDIRECT : 0x0;
1793 val |= GITS_BASER_PAGE_SIZE_4K;
1796 val |= GITS_BASER_PAGE_SIZE_16K;
1799 val |= GITS_BASER_PAGE_SIZE_64K;
1803 its_write_baser(its, baser, val);
1806 if ((val ^ tmp) & GITS_BASER_SHAREABILITY_MASK) {
1808 * Shareability didn't stick. Just use
1809 * whatever the read reported, which is likely
1810 * to be the only thing this redistributor
1811 * supports. If that's zero, make it
1812 * non-cacheable as well.
1814 shr = tmp & GITS_BASER_SHAREABILITY_MASK;
1816 cache = GITS_BASER_nC;
1817 gic_flush_dcache_to_poc(base, PAGE_ORDER_TO_SIZE(order));
1822 if ((val ^ tmp) & GITS_BASER_PAGE_SIZE_MASK) {
1824 * Page size didn't stick. Let's try a smaller
1825 * size and retry. If we reach 4K, then
1826 * something is horribly wrong...
1828 free_pages((unsigned long)base, order);
1834 goto retry_alloc_baser;
1837 goto retry_alloc_baser;
1842 pr_err("ITS@%pa: %s doesn't stick: %llx %llx\n",
1843 &its->phys_base, its_base_type_string[type],
1845 free_pages((unsigned long)base, order);
1849 baser->order = order;
1852 tmp = indirect ? GITS_LVL1_ENTRY_SIZE : esz;
1854 pr_info("ITS@%pa: allocated %d %s @%lx (%s, esz %d, psz %dK, shr %d)\n",
1855 &its->phys_base, (int)(PAGE_ORDER_TO_SIZE(order) / (int)tmp),
1856 its_base_type_string[type],
1857 (unsigned long)virt_to_phys(base),
1858 indirect ? "indirect" : "flat", (int)esz,
1859 psz / SZ_1K, (int)shr >> GITS_BASER_SHAREABILITY_SHIFT);
1864 static bool its_parse_indirect_baser(struct its_node *its,
1865 struct its_baser *baser,
1866 u32 psz, u32 *order, u32 ids)
1868 u64 tmp = its_read_baser(its, baser);
1869 u64 type = GITS_BASER_TYPE(tmp);
1870 u64 esz = GITS_BASER_ENTRY_SIZE(tmp);
1871 u64 val = GITS_BASER_InnerShareable | GITS_BASER_RaWaWb;
1872 u32 new_order = *order;
1873 bool indirect = false;
1875 /* No need to enable Indirection if memory requirement < (psz*2)bytes */
1876 if ((esz << ids) > (psz * 2)) {
1878 * Find out whether hw supports a single or two-level table by
1879 * table by reading bit at offset '62' after writing '1' to it.
1881 its_write_baser(its, baser, val | GITS_BASER_INDIRECT);
1882 indirect = !!(baser->val & GITS_BASER_INDIRECT);
1886 * The size of the lvl2 table is equal to ITS page size
1887 * which is 'psz'. For computing lvl1 table size,
1888 * subtract ID bits that sparse lvl2 table from 'ids'
1889 * which is reported by ITS hardware times lvl1 table
1892 ids -= ilog2(psz / (int)esz);
1893 esz = GITS_LVL1_ENTRY_SIZE;
1898 * Allocate as many entries as required to fit the
1899 * range of device IDs that the ITS can grok... The ID
1900 * space being incredibly sparse, this results in a
1901 * massive waste of memory if two-level device table
1902 * feature is not supported by hardware.
1904 new_order = max_t(u32, get_order(esz << ids), new_order);
1905 if (new_order >= MAX_ORDER) {
1906 new_order = MAX_ORDER - 1;
1907 ids = ilog2(PAGE_ORDER_TO_SIZE(new_order) / (int)esz);
1908 pr_warn("ITS@%pa: %s Table too large, reduce ids %u->%u\n",
1909 &its->phys_base, its_base_type_string[type],
1910 its->device_ids, ids);
1918 static void its_free_tables(struct its_node *its)
1922 for (i = 0; i < GITS_BASER_NR_REGS; i++) {
1923 if (its->tables[i].base) {
1924 free_pages((unsigned long)its->tables[i].base,
1925 its->tables[i].order);
1926 its->tables[i].base = NULL;
1931 static int its_alloc_tables(struct its_node *its)
1933 u64 shr = GITS_BASER_InnerShareable;
1934 u64 cache = GITS_BASER_RaWaWb;
1938 if (its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_22375)
1939 /* erratum 24313: ignore memory access type */
1940 cache = GITS_BASER_nCnB;
1942 for (i = 0; i < GITS_BASER_NR_REGS; i++) {
1943 struct its_baser *baser = its->tables + i;
1944 u64 val = its_read_baser(its, baser);
1945 u64 type = GITS_BASER_TYPE(val);
1946 u32 order = get_order(psz);
1947 bool indirect = false;
1950 case GITS_BASER_TYPE_NONE:
1953 case GITS_BASER_TYPE_DEVICE:
1954 indirect = its_parse_indirect_baser(its, baser,
1959 case GITS_BASER_TYPE_VCPU:
1960 indirect = its_parse_indirect_baser(its, baser,
1962 ITS_MAX_VPEID_BITS);
1966 err = its_setup_baser(its, baser, cache, shr, psz, order, indirect);
1968 its_free_tables(its);
1972 /* Update settings which will be used for next BASERn */
1974 cache = baser->val & GITS_BASER_CACHEABILITY_MASK;
1975 shr = baser->val & GITS_BASER_SHAREABILITY_MASK;
1981 static int its_alloc_collections(struct its_node *its)
1985 its->collections = kcalloc(nr_cpu_ids, sizeof(*its->collections),
1987 if (!its->collections)
1990 for (i = 0; i < nr_cpu_ids; i++)
1991 its->collections[i].target_address = ~0ULL;
1996 static struct page *its_allocate_pending_table(gfp_t gfp_flags)
1998 struct page *pend_page;
2000 pend_page = alloc_pages(gfp_flags | __GFP_ZERO,
2001 get_order(LPI_PENDBASE_SZ));
2005 /* Make sure the GIC will observe the zero-ed page */
2006 gic_flush_dcache_to_poc(page_address(pend_page), LPI_PENDBASE_SZ);
2011 static void its_free_pending_table(struct page *pt)
2013 free_pages((unsigned long)page_address(pt), get_order(LPI_PENDBASE_SZ));
2017 * Booting with kdump and LPIs enabled is generally fine. Any other
2018 * case is wrong in the absence of firmware/EFI support.
2020 static bool enabled_lpis_allowed(void)
2025 /* Check whether the property table is in a reserved region */
2026 val = gicr_read_propbaser(gic_data_rdist_rd_base() + GICR_PROPBASER);
2027 addr = val & GENMASK_ULL(51, 12);
2029 return gic_check_reserved_range(addr, LPI_PROPBASE_SZ);
2032 static int __init allocate_lpi_tables(void)
2038 * If LPIs are enabled while we run this from the boot CPU,
2039 * flag the RD tables as pre-allocated if the stars do align.
2041 val = readl_relaxed(gic_data_rdist_rd_base() + GICR_CTLR);
2042 if ((val & GICR_CTLR_ENABLE_LPIS) && enabled_lpis_allowed()) {
2043 gic_rdists->flags |= (RDIST_FLAGS_RD_TABLES_PREALLOCATED |
2044 RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING);
2045 pr_info("GICv3: Using preallocated redistributor tables\n");
2048 err = its_setup_lpi_prop_table();
2053 * We allocate all the pending tables anyway, as we may have a
2054 * mix of RDs that have had LPIs enabled, and some that
2055 * don't. We'll free the unused ones as each CPU comes online.
2057 for_each_possible_cpu(cpu) {
2058 struct page *pend_page;
2060 pend_page = its_allocate_pending_table(GFP_NOWAIT);
2062 pr_err("Failed to allocate PENDBASE for CPU%d\n", cpu);
2066 gic_data_rdist_cpu(cpu)->pend_page = pend_page;
2072 static u64 its_clear_vpend_valid(void __iomem *vlpi_base)
2074 u32 count = 1000000; /* 1s! */
2078 val = gits_read_vpendbaser(vlpi_base + GICR_VPENDBASER);
2079 val &= ~GICR_VPENDBASER_Valid;
2080 gits_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER);
2083 val = gits_read_vpendbaser(vlpi_base + GICR_VPENDBASER);
2084 clean = !(val & GICR_VPENDBASER_Dirty);
2090 } while (!clean && count);
2095 static void its_cpu_init_lpis(void)
2097 void __iomem *rbase = gic_data_rdist_rd_base();
2098 struct page *pend_page;
2102 if (gic_data_rdist()->lpi_enabled)
2105 val = readl_relaxed(rbase + GICR_CTLR);
2106 if ((gic_rdists->flags & RDIST_FLAGS_RD_TABLES_PREALLOCATED) &&
2107 (val & GICR_CTLR_ENABLE_LPIS)) {
2109 * Check that we get the same property table on all
2110 * RDs. If we don't, this is hopeless.
2112 paddr = gicr_read_propbaser(rbase + GICR_PROPBASER);
2113 paddr &= GENMASK_ULL(51, 12);
2114 if (WARN_ON(gic_rdists->prop_table_pa != paddr))
2115 add_taint(TAINT_CRAP, LOCKDEP_STILL_OK);
2117 paddr = gicr_read_pendbaser(rbase + GICR_PENDBASER);
2118 paddr &= GENMASK_ULL(51, 16);
2120 WARN_ON(!gic_check_reserved_range(paddr, LPI_PENDBASE_SZ));
2121 its_free_pending_table(gic_data_rdist()->pend_page);
2122 gic_data_rdist()->pend_page = NULL;
2127 pend_page = gic_data_rdist()->pend_page;
2128 paddr = page_to_phys(pend_page);
2129 WARN_ON(gic_reserve_range(paddr, LPI_PENDBASE_SZ));
2132 val = (gic_rdists->prop_table_pa |
2133 GICR_PROPBASER_InnerShareable |
2134 GICR_PROPBASER_RaWaWb |
2135 ((LPI_NRBITS - 1) & GICR_PROPBASER_IDBITS_MASK));
2137 gicr_write_propbaser(val, rbase + GICR_PROPBASER);
2138 tmp = gicr_read_propbaser(rbase + GICR_PROPBASER);
2140 if ((tmp ^ val) & GICR_PROPBASER_SHAREABILITY_MASK) {
2141 if (!(tmp & GICR_PROPBASER_SHAREABILITY_MASK)) {
2143 * The HW reports non-shareable, we must
2144 * remove the cacheability attributes as
2147 val &= ~(GICR_PROPBASER_SHAREABILITY_MASK |
2148 GICR_PROPBASER_CACHEABILITY_MASK);
2149 val |= GICR_PROPBASER_nC;
2150 gicr_write_propbaser(val, rbase + GICR_PROPBASER);
2152 pr_info_once("GIC: using cache flushing for LPI property table\n");
2153 gic_rdists->flags |= RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING;
2157 val = (page_to_phys(pend_page) |
2158 GICR_PENDBASER_InnerShareable |
2159 GICR_PENDBASER_RaWaWb);
2161 gicr_write_pendbaser(val, rbase + GICR_PENDBASER);
2162 tmp = gicr_read_pendbaser(rbase + GICR_PENDBASER);
2164 if (!(tmp & GICR_PENDBASER_SHAREABILITY_MASK)) {
2166 * The HW reports non-shareable, we must remove the
2167 * cacheability attributes as well.
2169 val &= ~(GICR_PENDBASER_SHAREABILITY_MASK |
2170 GICR_PENDBASER_CACHEABILITY_MASK);
2171 val |= GICR_PENDBASER_nC;
2172 gicr_write_pendbaser(val, rbase + GICR_PENDBASER);
2176 val = readl_relaxed(rbase + GICR_CTLR);
2177 val |= GICR_CTLR_ENABLE_LPIS;
2178 writel_relaxed(val, rbase + GICR_CTLR);
2180 if (gic_rdists->has_vlpis) {
2181 void __iomem *vlpi_base = gic_data_rdist_vlpi_base();
2184 * It's possible for CPU to receive VLPIs before it is
2185 * sheduled as a vPE, especially for the first CPU, and the
2186 * VLPI with INTID larger than 2^(IDbits+1) will be considered
2187 * as out of range and dropped by GIC.
2188 * So we initialize IDbits to known value to avoid VLPI drop.
2190 val = (LPI_NRBITS - 1) & GICR_VPROPBASER_IDBITS_MASK;
2191 pr_debug("GICv4: CPU%d: Init IDbits to 0x%llx for GICR_VPROPBASER\n",
2192 smp_processor_id(), val);
2193 gits_write_vpropbaser(val, vlpi_base + GICR_VPROPBASER);
2196 * Also clear Valid bit of GICR_VPENDBASER, in case some
2197 * ancient programming gets left in and has possibility of
2198 * corrupting memory.
2200 val = its_clear_vpend_valid(vlpi_base);
2201 WARN_ON(val & GICR_VPENDBASER_Dirty);
2204 /* Make sure the GIC has seen the above */
2207 gic_data_rdist()->lpi_enabled = true;
2208 pr_info("GICv3: CPU%d: using %s LPI pending table @%pa\n",
2210 gic_data_rdist()->pend_page ? "allocated" : "reserved",
2214 static void its_cpu_init_collection(struct its_node *its)
2216 int cpu = smp_processor_id();
2219 /* avoid cross node collections and its mapping */
2220 if (its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_23144) {
2221 struct device_node *cpu_node;
2223 cpu_node = of_get_cpu_node(cpu, NULL);
2224 if (its->numa_node != NUMA_NO_NODE &&
2225 its->numa_node != of_node_to_nid(cpu_node))
2230 * We now have to bind each collection to its target
2233 if (gic_read_typer(its->base + GITS_TYPER) & GITS_TYPER_PTA) {
2235 * This ITS wants the physical address of the
2238 target = gic_data_rdist()->phys_base;
2240 /* This ITS wants a linear CPU number. */
2241 target = gic_read_typer(gic_data_rdist_rd_base() + GICR_TYPER);
2242 target = GICR_TYPER_CPU_NUMBER(target) << 16;
2245 /* Perform collection mapping */
2246 its->collections[cpu].target_address = target;
2247 its->collections[cpu].col_id = cpu;
2249 its_send_mapc(its, &its->collections[cpu], 1);
2250 its_send_invall(its, &its->collections[cpu]);
2253 static void its_cpu_init_collections(void)
2255 struct its_node *its;
2257 raw_spin_lock(&its_lock);
2259 list_for_each_entry(its, &its_nodes, entry)
2260 its_cpu_init_collection(its);
2262 raw_spin_unlock(&its_lock);
2265 static struct its_device *its_find_device(struct its_node *its, u32 dev_id)
2267 struct its_device *its_dev = NULL, *tmp;
2268 unsigned long flags;
2270 raw_spin_lock_irqsave(&its->lock, flags);
2272 list_for_each_entry(tmp, &its->its_device_list, entry) {
2273 if (tmp->device_id == dev_id) {
2279 raw_spin_unlock_irqrestore(&its->lock, flags);
2284 static struct its_baser *its_get_baser(struct its_node *its, u32 type)
2288 for (i = 0; i < GITS_BASER_NR_REGS; i++) {
2289 if (GITS_BASER_TYPE(its->tables[i].val) == type)
2290 return &its->tables[i];
2296 static bool its_alloc_table_entry(struct its_node *its,
2297 struct its_baser *baser, u32 id)
2303 /* Don't allow device id that exceeds single, flat table limit */
2304 esz = GITS_BASER_ENTRY_SIZE(baser->val);
2305 if (!(baser->val & GITS_BASER_INDIRECT))
2306 return (id < (PAGE_ORDER_TO_SIZE(baser->order) / esz));
2308 /* Compute 1st level table index & check if that exceeds table limit */
2309 idx = id >> ilog2(baser->psz / esz);
2310 if (idx >= (PAGE_ORDER_TO_SIZE(baser->order) / GITS_LVL1_ENTRY_SIZE))
2313 table = baser->base;
2315 /* Allocate memory for 2nd level table */
2317 page = alloc_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO,
2318 get_order(baser->psz));
2322 /* Flush Lvl2 table to PoC if hw doesn't support coherency */
2323 if (!(baser->val & GITS_BASER_SHAREABILITY_MASK))
2324 gic_flush_dcache_to_poc(page_address(page), baser->psz);
2326 table[idx] = cpu_to_le64(page_to_phys(page) | GITS_BASER_VALID);
2328 /* Flush Lvl1 entry to PoC if hw doesn't support coherency */
2329 if (!(baser->val & GITS_BASER_SHAREABILITY_MASK))
2330 gic_flush_dcache_to_poc(table + idx, GITS_LVL1_ENTRY_SIZE);
2332 /* Ensure updated table contents are visible to ITS hardware */
2339 static bool its_alloc_device_table(struct its_node *its, u32 dev_id)
2341 struct its_baser *baser;
2343 baser = its_get_baser(its, GITS_BASER_TYPE_DEVICE);
2345 /* Don't allow device id that exceeds ITS hardware limit */
2347 return (ilog2(dev_id) < its->device_ids);
2349 return its_alloc_table_entry(its, baser, dev_id);
2352 static bool its_alloc_vpe_table(u32 vpe_id)
2354 struct its_node *its;
2357 * Make sure the L2 tables are allocated on *all* v4 ITSs. We
2358 * could try and only do it on ITSs corresponding to devices
2359 * that have interrupts targeted at this VPE, but the
2360 * complexity becomes crazy (and you have tons of memory
2363 list_for_each_entry(its, &its_nodes, entry) {
2364 struct its_baser *baser;
2369 baser = its_get_baser(its, GITS_BASER_TYPE_VCPU);
2373 if (!its_alloc_table_entry(its, baser, vpe_id))
2380 static struct its_device *its_create_device(struct its_node *its, u32 dev_id,
2381 int nvecs, bool alloc_lpis)
2383 struct its_device *dev;
2384 unsigned long *lpi_map = NULL;
2385 unsigned long flags;
2386 u16 *col_map = NULL;
2393 if (!its_alloc_device_table(its, dev_id))
2396 if (WARN_ON(!is_power_of_2(nvecs)))
2397 nvecs = roundup_pow_of_two(nvecs);
2399 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2401 * Even if the device wants a single LPI, the ITT must be
2402 * sized as a power of two (and you need at least one bit...).
2404 nr_ites = max(2, nvecs);
2405 sz = nr_ites * its->ite_size;
2406 sz = max(sz, ITS_ITT_ALIGN) + ITS_ITT_ALIGN - 1;
2407 itt = kzalloc_node(sz, GFP_KERNEL, its->numa_node);
2409 lpi_map = its_lpi_alloc(nvecs, &lpi_base, &nr_lpis);
2411 col_map = kcalloc(nr_lpis, sizeof(*col_map),
2414 col_map = kcalloc(nr_ites, sizeof(*col_map), GFP_KERNEL);
2419 if (!dev || !itt || !col_map || (!lpi_map && alloc_lpis)) {
2427 gic_flush_dcache_to_poc(itt, sz);
2431 dev->nr_ites = nr_ites;
2432 dev->event_map.lpi_map = lpi_map;
2433 dev->event_map.col_map = col_map;
2434 dev->event_map.lpi_base = lpi_base;
2435 dev->event_map.nr_lpis = nr_lpis;
2436 mutex_init(&dev->event_map.vlpi_lock);
2437 dev->device_id = dev_id;
2438 INIT_LIST_HEAD(&dev->entry);
2440 raw_spin_lock_irqsave(&its->lock, flags);
2441 list_add(&dev->entry, &its->its_device_list);
2442 raw_spin_unlock_irqrestore(&its->lock, flags);
2444 /* Map device to its ITT */
2445 its_send_mapd(dev, 1);
2450 static void its_free_device(struct its_device *its_dev)
2452 unsigned long flags;
2454 raw_spin_lock_irqsave(&its_dev->its->lock, flags);
2455 list_del(&its_dev->entry);
2456 raw_spin_unlock_irqrestore(&its_dev->its->lock, flags);
2457 kfree(its_dev->itt);
2461 static int its_alloc_device_irq(struct its_device *dev, int nvecs, irq_hw_number_t *hwirq)
2465 idx = bitmap_find_free_region(dev->event_map.lpi_map,
2466 dev->event_map.nr_lpis,
2467 get_count_order(nvecs));
2471 *hwirq = dev->event_map.lpi_base + idx;
2472 set_bit(idx, dev->event_map.lpi_map);
2477 static int its_msi_prepare(struct irq_domain *domain, struct device *dev,
2478 int nvec, msi_alloc_info_t *info)
2480 struct its_node *its;
2481 struct its_device *its_dev;
2482 struct msi_domain_info *msi_info;
2487 * We ignore "dev" entirely, and rely on the dev_id that has
2488 * been passed via the scratchpad. This limits this domain's
2489 * usefulness to upper layers that definitely know that they
2490 * are built on top of the ITS.
2492 dev_id = info->scratchpad[0].ul;
2494 msi_info = msi_get_domain_info(domain);
2495 its = msi_info->data;
2497 if (!gic_rdists->has_direct_lpi &&
2499 vpe_proxy.dev->its == its &&
2500 dev_id == vpe_proxy.dev->device_id) {
2501 /* Bad luck. Get yourself a better implementation */
2502 WARN_ONCE(1, "DevId %x clashes with GICv4 VPE proxy device\n",
2507 mutex_lock(&its->dev_alloc_lock);
2508 its_dev = its_find_device(its, dev_id);
2511 * We already have seen this ID, probably through
2512 * another alias (PCI bridge of some sort). No need to
2513 * create the device.
2515 its_dev->shared = true;
2516 pr_debug("Reusing ITT for devID %x\n", dev_id);
2520 its_dev = its_create_device(its, dev_id, nvec, true);
2526 pr_debug("ITT %d entries, %d bits\n", nvec, ilog2(nvec));
2528 mutex_unlock(&its->dev_alloc_lock);
2529 info->scratchpad[0].ptr = its_dev;
2533 static struct msi_domain_ops its_msi_domain_ops = {
2534 .msi_prepare = its_msi_prepare,
2537 static int its_irq_gic_domain_alloc(struct irq_domain *domain,
2539 irq_hw_number_t hwirq)
2541 struct irq_fwspec fwspec;
2543 if (irq_domain_get_of_node(domain->parent)) {
2544 fwspec.fwnode = domain->parent->fwnode;
2545 fwspec.param_count = 3;
2546 fwspec.param[0] = GIC_IRQ_TYPE_LPI;
2547 fwspec.param[1] = hwirq;
2548 fwspec.param[2] = IRQ_TYPE_EDGE_RISING;
2549 } else if (is_fwnode_irqchip(domain->parent->fwnode)) {
2550 fwspec.fwnode = domain->parent->fwnode;
2551 fwspec.param_count = 2;
2552 fwspec.param[0] = hwirq;
2553 fwspec.param[1] = IRQ_TYPE_EDGE_RISING;
2558 return irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
2561 static int its_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
2562 unsigned int nr_irqs, void *args)
2564 msi_alloc_info_t *info = args;
2565 struct its_device *its_dev = info->scratchpad[0].ptr;
2566 struct its_node *its = its_dev->its;
2567 irq_hw_number_t hwirq;
2571 err = its_alloc_device_irq(its_dev, nr_irqs, &hwirq);
2575 err = iommu_dma_prepare_msi(info->desc, its->get_msi_base(its_dev));
2579 for (i = 0; i < nr_irqs; i++) {
2580 err = its_irq_gic_domain_alloc(domain, virq + i, hwirq + i);
2584 irq_domain_set_hwirq_and_chip(domain, virq + i,
2585 hwirq + i, &its_irq_chip, its_dev);
2586 irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq + i)));
2587 pr_debug("ID:%d pID:%d vID:%d\n",
2588 (int)(hwirq + i - its_dev->event_map.lpi_base),
2589 (int)(hwirq + i), virq + i);
2595 static int its_irq_domain_activate(struct irq_domain *domain,
2596 struct irq_data *d, bool reserve)
2598 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
2599 u32 event = its_get_event_id(d);
2600 const struct cpumask *cpu_mask = cpu_online_mask;
2603 /* get the cpu_mask of local node */
2604 if (its_dev->its->numa_node >= 0)
2605 cpu_mask = cpumask_of_node(its_dev->its->numa_node);
2607 /* Bind the LPI to the first possible CPU */
2608 cpu = cpumask_first_and(cpu_mask, cpu_online_mask);
2609 if (cpu >= nr_cpu_ids) {
2610 if (its_dev->its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_23144)
2613 cpu = cpumask_first(cpu_online_mask);
2616 its_dev->event_map.col_map[event] = cpu;
2617 irq_data_update_effective_affinity(d, cpumask_of(cpu));
2619 /* Map the GIC IRQ and event to the device */
2620 its_send_mapti(its_dev, d->hwirq, event);
2624 static void its_irq_domain_deactivate(struct irq_domain *domain,
2627 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
2628 u32 event = its_get_event_id(d);
2630 /* Stop the delivery of interrupts */
2631 its_send_discard(its_dev, event);
2634 static void its_irq_domain_free(struct irq_domain *domain, unsigned int virq,
2635 unsigned int nr_irqs)
2637 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
2638 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
2639 struct its_node *its = its_dev->its;
2642 for (i = 0; i < nr_irqs; i++) {
2643 struct irq_data *data = irq_domain_get_irq_data(domain,
2645 u32 event = its_get_event_id(data);
2647 /* Mark interrupt index as unused */
2648 clear_bit(event, its_dev->event_map.lpi_map);
2650 /* Nuke the entry in the domain */
2651 irq_domain_reset_irq_data(data);
2654 mutex_lock(&its->dev_alloc_lock);
2657 * If all interrupts have been freed, start mopping the
2658 * floor. This is conditionned on the device not being shared.
2660 if (!its_dev->shared &&
2661 bitmap_empty(its_dev->event_map.lpi_map,
2662 its_dev->event_map.nr_lpis)) {
2663 its_lpi_free(its_dev->event_map.lpi_map,
2664 its_dev->event_map.lpi_base,
2665 its_dev->event_map.nr_lpis);
2666 kfree(its_dev->event_map.col_map);
2668 /* Unmap device/itt */
2669 its_send_mapd(its_dev, 0);
2670 its_free_device(its_dev);
2673 mutex_unlock(&its->dev_alloc_lock);
2675 irq_domain_free_irqs_parent(domain, virq, nr_irqs);
2678 static const struct irq_domain_ops its_domain_ops = {
2679 .alloc = its_irq_domain_alloc,
2680 .free = its_irq_domain_free,
2681 .activate = its_irq_domain_activate,
2682 .deactivate = its_irq_domain_deactivate,
2688 * If a GICv4 doesn't implement Direct LPIs (which is extremely
2689 * likely), the only way to perform an invalidate is to use a fake
2690 * device to issue an INV command, implying that the LPI has first
2691 * been mapped to some event on that device. Since this is not exactly
2692 * cheap, we try to keep that mapping around as long as possible, and
2693 * only issue an UNMAP if we're short on available slots.
2695 * Broken by design(tm).
2697 static void its_vpe_db_proxy_unmap_locked(struct its_vpe *vpe)
2699 /* Already unmapped? */
2700 if (vpe->vpe_proxy_event == -1)
2703 its_send_discard(vpe_proxy.dev, vpe->vpe_proxy_event);
2704 vpe_proxy.vpes[vpe->vpe_proxy_event] = NULL;
2707 * We don't track empty slots at all, so let's move the
2708 * next_victim pointer if we can quickly reuse that slot
2709 * instead of nuking an existing entry. Not clear that this is
2710 * always a win though, and this might just generate a ripple
2711 * effect... Let's just hope VPEs don't migrate too often.
2713 if (vpe_proxy.vpes[vpe_proxy.next_victim])
2714 vpe_proxy.next_victim = vpe->vpe_proxy_event;
2716 vpe->vpe_proxy_event = -1;
2719 static void its_vpe_db_proxy_unmap(struct its_vpe *vpe)
2721 if (!gic_rdists->has_direct_lpi) {
2722 unsigned long flags;
2724 raw_spin_lock_irqsave(&vpe_proxy.lock, flags);
2725 its_vpe_db_proxy_unmap_locked(vpe);
2726 raw_spin_unlock_irqrestore(&vpe_proxy.lock, flags);
2730 static void its_vpe_db_proxy_map_locked(struct its_vpe *vpe)
2732 /* Already mapped? */
2733 if (vpe->vpe_proxy_event != -1)
2736 /* This slot was already allocated. Kick the other VPE out. */
2737 if (vpe_proxy.vpes[vpe_proxy.next_victim])
2738 its_vpe_db_proxy_unmap_locked(vpe_proxy.vpes[vpe_proxy.next_victim]);
2740 /* Map the new VPE instead */
2741 vpe_proxy.vpes[vpe_proxy.next_victim] = vpe;
2742 vpe->vpe_proxy_event = vpe_proxy.next_victim;
2743 vpe_proxy.next_victim = (vpe_proxy.next_victim + 1) % vpe_proxy.dev->nr_ites;
2745 vpe_proxy.dev->event_map.col_map[vpe->vpe_proxy_event] = vpe->col_idx;
2746 its_send_mapti(vpe_proxy.dev, vpe->vpe_db_lpi, vpe->vpe_proxy_event);
2749 static void its_vpe_db_proxy_move(struct its_vpe *vpe, int from, int to)
2751 unsigned long flags;
2752 struct its_collection *target_col;
2754 if (gic_rdists->has_direct_lpi) {
2755 void __iomem *rdbase;
2757 rdbase = per_cpu_ptr(gic_rdists->rdist, from)->rd_base;
2758 gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_CLRLPIR);
2759 while (gic_read_lpir(rdbase + GICR_SYNCR) & 1)
2765 raw_spin_lock_irqsave(&vpe_proxy.lock, flags);
2767 its_vpe_db_proxy_map_locked(vpe);
2769 target_col = &vpe_proxy.dev->its->collections[to];
2770 its_send_movi(vpe_proxy.dev, target_col, vpe->vpe_proxy_event);
2771 vpe_proxy.dev->event_map.col_map[vpe->vpe_proxy_event] = to;
2773 raw_spin_unlock_irqrestore(&vpe_proxy.lock, flags);
2776 static int its_vpe_set_affinity(struct irq_data *d,
2777 const struct cpumask *mask_val,
2780 struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
2781 int cpu = cpumask_first(mask_val);
2784 * Changing affinity is mega expensive, so let's be as lazy as
2785 * we can and only do it if we really have to. Also, if mapped
2786 * into the proxy device, we need to move the doorbell
2787 * interrupt to its new location.
2789 if (vpe->col_idx != cpu) {
2790 int from = vpe->col_idx;
2793 its_send_vmovp(vpe);
2794 its_vpe_db_proxy_move(vpe, from, cpu);
2797 irq_data_update_effective_affinity(d, cpumask_of(cpu));
2799 return IRQ_SET_MASK_OK_DONE;
2802 static void its_vpe_schedule(struct its_vpe *vpe)
2804 void __iomem *vlpi_base = gic_data_rdist_vlpi_base();
2807 /* Schedule the VPE */
2808 val = virt_to_phys(page_address(vpe->its_vm->vprop_page)) &
2809 GENMASK_ULL(51, 12);
2810 val |= (LPI_NRBITS - 1) & GICR_VPROPBASER_IDBITS_MASK;
2811 val |= GICR_VPROPBASER_RaWb;
2812 val |= GICR_VPROPBASER_InnerShareable;
2813 gits_write_vpropbaser(val, vlpi_base + GICR_VPROPBASER);
2815 val = virt_to_phys(page_address(vpe->vpt_page)) &
2816 GENMASK_ULL(51, 16);
2817 val |= GICR_VPENDBASER_RaWaWb;
2818 val |= GICR_VPENDBASER_NonShareable;
2820 * There is no good way of finding out if the pending table is
2821 * empty as we can race against the doorbell interrupt very
2822 * easily. So in the end, vpe->pending_last is only an
2823 * indication that the vcpu has something pending, not one
2824 * that the pending table is empty. A good implementation
2825 * would be able to read its coarse map pretty quickly anyway,
2826 * making this a tolerable issue.
2828 val |= GICR_VPENDBASER_PendingLast;
2829 val |= vpe->idai ? GICR_VPENDBASER_IDAI : 0;
2830 val |= GICR_VPENDBASER_Valid;
2831 gits_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER);
2834 static void its_vpe_deschedule(struct its_vpe *vpe)
2836 void __iomem *vlpi_base = gic_data_rdist_vlpi_base();
2839 val = its_clear_vpend_valid(vlpi_base);
2841 if (unlikely(val & GICR_VPENDBASER_Dirty)) {
2842 pr_err_ratelimited("ITS virtual pending table not cleaning\n");
2844 vpe->pending_last = true;
2846 vpe->idai = !!(val & GICR_VPENDBASER_IDAI);
2847 vpe->pending_last = !!(val & GICR_VPENDBASER_PendingLast);
2851 static void its_vpe_invall(struct its_vpe *vpe)
2853 struct its_node *its;
2855 list_for_each_entry(its, &its_nodes, entry) {
2859 if (its_list_map && !vpe->its_vm->vlpi_count[its->list_nr])
2863 * Sending a VINVALL to a single ITS is enough, as all
2864 * we need is to reach the redistributors.
2866 its_send_vinvall(its, vpe);
2871 static int its_vpe_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
2873 struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
2874 struct its_cmd_info *info = vcpu_info;
2876 switch (info->cmd_type) {
2878 its_vpe_schedule(vpe);
2881 case DESCHEDULE_VPE:
2882 its_vpe_deschedule(vpe);
2886 its_vpe_invall(vpe);
2894 static void its_vpe_send_cmd(struct its_vpe *vpe,
2895 void (*cmd)(struct its_device *, u32))
2897 unsigned long flags;
2899 raw_spin_lock_irqsave(&vpe_proxy.lock, flags);
2901 its_vpe_db_proxy_map_locked(vpe);
2902 cmd(vpe_proxy.dev, vpe->vpe_proxy_event);
2904 raw_spin_unlock_irqrestore(&vpe_proxy.lock, flags);
2907 static void its_vpe_send_inv(struct irq_data *d)
2909 struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
2911 if (gic_rdists->has_direct_lpi) {
2912 void __iomem *rdbase;
2914 rdbase = per_cpu_ptr(gic_rdists->rdist, vpe->col_idx)->rd_base;
2915 gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_INVLPIR);
2916 while (gic_read_lpir(rdbase + GICR_SYNCR) & 1)
2919 its_vpe_send_cmd(vpe, its_send_inv);
2923 static void its_vpe_mask_irq(struct irq_data *d)
2926 * We need to unmask the LPI, which is described by the parent
2927 * irq_data. Instead of calling into the parent (which won't
2928 * exactly do the right thing, let's simply use the
2929 * parent_data pointer. Yes, I'm naughty.
2931 lpi_write_config(d->parent_data, LPI_PROP_ENABLED, 0);
2932 its_vpe_send_inv(d);
2935 static void its_vpe_unmask_irq(struct irq_data *d)
2937 /* Same hack as above... */
2938 lpi_write_config(d->parent_data, 0, LPI_PROP_ENABLED);
2939 its_vpe_send_inv(d);
2942 static int its_vpe_set_irqchip_state(struct irq_data *d,
2943 enum irqchip_irq_state which,
2946 struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
2948 if (which != IRQCHIP_STATE_PENDING)
2951 if (gic_rdists->has_direct_lpi) {
2952 void __iomem *rdbase;
2954 rdbase = per_cpu_ptr(gic_rdists->rdist, vpe->col_idx)->rd_base;
2956 gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_SETLPIR);
2958 gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_CLRLPIR);
2959 while (gic_read_lpir(rdbase + GICR_SYNCR) & 1)
2964 its_vpe_send_cmd(vpe, its_send_int);
2966 its_vpe_send_cmd(vpe, its_send_clear);
2972 static struct irq_chip its_vpe_irq_chip = {
2973 .name = "GICv4-vpe",
2974 .irq_mask = its_vpe_mask_irq,
2975 .irq_unmask = its_vpe_unmask_irq,
2976 .irq_eoi = irq_chip_eoi_parent,
2977 .irq_set_affinity = its_vpe_set_affinity,
2978 .irq_set_irqchip_state = its_vpe_set_irqchip_state,
2979 .irq_set_vcpu_affinity = its_vpe_set_vcpu_affinity,
2982 static int its_vpe_id_alloc(void)
2984 return ida_simple_get(&its_vpeid_ida, 0, ITS_MAX_VPEID, GFP_KERNEL);
2987 static void its_vpe_id_free(u16 id)
2989 ida_simple_remove(&its_vpeid_ida, id);
2992 static int its_vpe_init(struct its_vpe *vpe)
2994 struct page *vpt_page;
2997 /* Allocate vpe_id */
2998 vpe_id = its_vpe_id_alloc();
3003 vpt_page = its_allocate_pending_table(GFP_KERNEL);
3005 its_vpe_id_free(vpe_id);
3009 if (!its_alloc_vpe_table(vpe_id)) {
3010 its_vpe_id_free(vpe_id);
3011 its_free_pending_table(vpe->vpt_page);
3015 vpe->vpe_id = vpe_id;
3016 vpe->vpt_page = vpt_page;
3017 vpe->vpe_proxy_event = -1;
3022 static void its_vpe_teardown(struct its_vpe *vpe)
3024 its_vpe_db_proxy_unmap(vpe);
3025 its_vpe_id_free(vpe->vpe_id);
3026 its_free_pending_table(vpe->vpt_page);
3029 static void its_vpe_irq_domain_free(struct irq_domain *domain,
3031 unsigned int nr_irqs)
3033 struct its_vm *vm = domain->host_data;
3036 irq_domain_free_irqs_parent(domain, virq, nr_irqs);
3038 for (i = 0; i < nr_irqs; i++) {
3039 struct irq_data *data = irq_domain_get_irq_data(domain,
3041 struct its_vpe *vpe = irq_data_get_irq_chip_data(data);
3043 BUG_ON(vm != vpe->its_vm);
3045 clear_bit(data->hwirq, vm->db_bitmap);
3046 its_vpe_teardown(vpe);
3047 irq_domain_reset_irq_data(data);
3050 if (bitmap_empty(vm->db_bitmap, vm->nr_db_lpis)) {
3051 its_lpi_free(vm->db_bitmap, vm->db_lpi_base, vm->nr_db_lpis);
3052 its_free_prop_table(vm->vprop_page);
3056 static int its_vpe_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
3057 unsigned int nr_irqs, void *args)
3059 struct its_vm *vm = args;
3060 unsigned long *bitmap;
3061 struct page *vprop_page;
3062 int base, nr_ids, i, err = 0;
3066 bitmap = its_lpi_alloc(roundup_pow_of_two(nr_irqs), &base, &nr_ids);
3070 if (nr_ids < nr_irqs) {
3071 its_lpi_free(bitmap, base, nr_ids);
3075 vprop_page = its_allocate_prop_table(GFP_KERNEL);
3077 its_lpi_free(bitmap, base, nr_ids);
3081 vm->db_bitmap = bitmap;
3082 vm->db_lpi_base = base;
3083 vm->nr_db_lpis = nr_ids;
3084 vm->vprop_page = vprop_page;
3086 for (i = 0; i < nr_irqs; i++) {
3087 vm->vpes[i]->vpe_db_lpi = base + i;
3088 err = its_vpe_init(vm->vpes[i]);
3091 err = its_irq_gic_domain_alloc(domain, virq + i,
3092 vm->vpes[i]->vpe_db_lpi);
3095 irq_domain_set_hwirq_and_chip(domain, virq + i, i,
3096 &its_vpe_irq_chip, vm->vpes[i]);
3102 its_vpe_irq_domain_free(domain, virq, i - 1);
3104 its_lpi_free(bitmap, base, nr_ids);
3105 its_free_prop_table(vprop_page);
3111 static int its_vpe_irq_domain_activate(struct irq_domain *domain,
3112 struct irq_data *d, bool reserve)
3114 struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
3115 struct its_node *its;
3117 /* If we use the list map, we issue VMAPP on demand... */
3121 /* Map the VPE to the first possible CPU */
3122 vpe->col_idx = cpumask_first(cpu_online_mask);
3124 list_for_each_entry(its, &its_nodes, entry) {
3128 its_send_vmapp(its, vpe, true);
3129 its_send_vinvall(its, vpe);
3132 irq_data_update_effective_affinity(d, cpumask_of(vpe->col_idx));
3137 static void its_vpe_irq_domain_deactivate(struct irq_domain *domain,
3140 struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
3141 struct its_node *its;
3144 * If we use the list map, we unmap the VPE once no VLPIs are
3145 * associated with the VM.
3150 list_for_each_entry(its, &its_nodes, entry) {
3154 its_send_vmapp(its, vpe, false);
3158 static const struct irq_domain_ops its_vpe_domain_ops = {
3159 .alloc = its_vpe_irq_domain_alloc,
3160 .free = its_vpe_irq_domain_free,
3161 .activate = its_vpe_irq_domain_activate,
3162 .deactivate = its_vpe_irq_domain_deactivate,
3165 static int its_force_quiescent(void __iomem *base)
3167 u32 count = 1000000; /* 1s */
3170 val = readl_relaxed(base + GITS_CTLR);
3172 * GIC architecture specification requires the ITS to be both
3173 * disabled and quiescent for writes to GITS_BASER<n> or
3174 * GITS_CBASER to not have UNPREDICTABLE results.
3176 if ((val & GITS_CTLR_QUIESCENT) && !(val & GITS_CTLR_ENABLE))
3179 /* Disable the generation of all interrupts to this ITS */
3180 val &= ~(GITS_CTLR_ENABLE | GITS_CTLR_ImDe);
3181 writel_relaxed(val, base + GITS_CTLR);
3183 /* Poll GITS_CTLR and wait until ITS becomes quiescent */
3185 val = readl_relaxed(base + GITS_CTLR);
3186 if (val & GITS_CTLR_QUIESCENT)
3198 static bool __maybe_unused its_enable_quirk_cavium_22375(void *data)
3200 struct its_node *its = data;
3202 /* erratum 22375: only alloc 8MB table size */
3203 its->device_ids = 0x14; /* 20 bits, 8MB */
3204 its->flags |= ITS_FLAGS_WORKAROUND_CAVIUM_22375;
3209 static bool __maybe_unused its_enable_quirk_cavium_23144(void *data)
3211 struct its_node *its = data;
3213 its->flags |= ITS_FLAGS_WORKAROUND_CAVIUM_23144;
3218 static bool __maybe_unused its_enable_quirk_qdf2400_e0065(void *data)
3220 struct its_node *its = data;
3222 /* On QDF2400, the size of the ITE is 16Bytes */
3228 static u64 its_irq_get_msi_base_pre_its(struct its_device *its_dev)
3230 struct its_node *its = its_dev->its;
3233 * The Socionext Synquacer SoC has a so-called 'pre-ITS',
3234 * which maps 32-bit writes targeted at a separate window of
3235 * size '4 << device_id_bits' onto writes to GITS_TRANSLATER
3236 * with device ID taken from bits [device_id_bits + 1:2] of
3237 * the window offset.
3239 return its->pre_its_base + (its_dev->device_id << 2);
3242 static bool __maybe_unused its_enable_quirk_socionext_synquacer(void *data)
3244 struct its_node *its = data;
3245 u32 pre_its_window[2];
3248 if (!fwnode_property_read_u32_array(its->fwnode_handle,
3249 "socionext,synquacer-pre-its",
3251 ARRAY_SIZE(pre_its_window))) {
3253 its->pre_its_base = pre_its_window[0];
3254 its->get_msi_base = its_irq_get_msi_base_pre_its;
3256 ids = ilog2(pre_its_window[1]) - 2;
3257 if (its->device_ids > ids)
3258 its->device_ids = ids;
3260 /* the pre-ITS breaks isolation, so disable MSI remapping */
3261 its->msi_domain_flags &= ~IRQ_DOMAIN_FLAG_MSI_REMAP;
3267 static bool __maybe_unused its_enable_quirk_hip07_161600802(void *data)
3269 struct its_node *its = data;
3272 * Hip07 insists on using the wrong address for the VLPI
3273 * page. Trick it into doing the right thing...
3275 its->vlpi_redist_offset = SZ_128K;
3279 static const struct gic_quirk its_quirks[] = {
3280 #ifdef CONFIG_CAVIUM_ERRATUM_22375
3282 .desc = "ITS: Cavium errata 22375, 24313",
3283 .iidr = 0xa100034c, /* ThunderX pass 1.x */
3285 .init = its_enable_quirk_cavium_22375,
3288 #ifdef CONFIG_CAVIUM_ERRATUM_23144
3290 .desc = "ITS: Cavium erratum 23144",
3291 .iidr = 0xa100034c, /* ThunderX pass 1.x */
3293 .init = its_enable_quirk_cavium_23144,
3296 #ifdef CONFIG_QCOM_QDF2400_ERRATUM_0065
3298 .desc = "ITS: QDF2400 erratum 0065",
3299 .iidr = 0x00001070, /* QDF2400 ITS rev 1.x */
3301 .init = its_enable_quirk_qdf2400_e0065,
3304 #ifdef CONFIG_SOCIONEXT_SYNQUACER_PREITS
3307 * The Socionext Synquacer SoC incorporates ARM's own GIC-500
3308 * implementation, but with a 'pre-ITS' added that requires
3309 * special handling in software.
3311 .desc = "ITS: Socionext Synquacer pre-ITS",
3314 .init = its_enable_quirk_socionext_synquacer,
3317 #ifdef CONFIG_HISILICON_ERRATUM_161600802
3319 .desc = "ITS: Hip07 erratum 161600802",
3322 .init = its_enable_quirk_hip07_161600802,
3329 static void its_enable_quirks(struct its_node *its)
3331 u32 iidr = readl_relaxed(its->base + GITS_IIDR);
3333 gic_enable_quirks(iidr, its_quirks, its);
3336 static int its_save_disable(void)
3338 struct its_node *its;
3341 raw_spin_lock(&its_lock);
3342 list_for_each_entry(its, &its_nodes, entry) {
3345 if (!(its->flags & ITS_FLAGS_SAVE_SUSPEND_STATE))
3349 its->ctlr_save = readl_relaxed(base + GITS_CTLR);
3350 err = its_force_quiescent(base);
3352 pr_err("ITS@%pa: failed to quiesce: %d\n",
3353 &its->phys_base, err);
3354 writel_relaxed(its->ctlr_save, base + GITS_CTLR);
3358 its->cbaser_save = gits_read_cbaser(base + GITS_CBASER);
3363 list_for_each_entry_continue_reverse(its, &its_nodes, entry) {
3366 if (!(its->flags & ITS_FLAGS_SAVE_SUSPEND_STATE))
3370 writel_relaxed(its->ctlr_save, base + GITS_CTLR);
3373 raw_spin_unlock(&its_lock);
3378 static void its_restore_enable(void)
3380 struct its_node *its;
3383 raw_spin_lock(&its_lock);
3384 list_for_each_entry(its, &its_nodes, entry) {
3388 if (!(its->flags & ITS_FLAGS_SAVE_SUSPEND_STATE))
3394 * Make sure that the ITS is disabled. If it fails to quiesce,
3395 * don't restore it since writing to CBASER or BASER<n>
3396 * registers is undefined according to the GIC v3 ITS
3399 ret = its_force_quiescent(base);
3401 pr_err("ITS@%pa: failed to quiesce on resume: %d\n",
3402 &its->phys_base, ret);
3406 gits_write_cbaser(its->cbaser_save, base + GITS_CBASER);
3409 * Writing CBASER resets CREADR to 0, so make CWRITER and
3410 * cmd_write line up with it.
3412 its->cmd_write = its->cmd_base;
3413 gits_write_cwriter(0, base + GITS_CWRITER);
3415 /* Restore GITS_BASER from the value cache. */
3416 for (i = 0; i < GITS_BASER_NR_REGS; i++) {
3417 struct its_baser *baser = &its->tables[i];
3419 if (!(baser->val & GITS_BASER_VALID))
3422 its_write_baser(its, baser, baser->val);
3424 writel_relaxed(its->ctlr_save, base + GITS_CTLR);
3427 * Reinit the collection if it's stored in the ITS. This is
3428 * indicated by the col_id being less than the HCC field.
3429 * CID < HCC as specified in the GIC v3 Documentation.
3431 if (its->collections[smp_processor_id()].col_id <
3432 GITS_TYPER_HCC(gic_read_typer(base + GITS_TYPER)))
3433 its_cpu_init_collection(its);
3435 raw_spin_unlock(&its_lock);
3438 static struct syscore_ops its_syscore_ops = {
3439 .suspend = its_save_disable,
3440 .resume = its_restore_enable,
3443 static int its_init_domain(struct fwnode_handle *handle, struct its_node *its)
3445 struct irq_domain *inner_domain;
3446 struct msi_domain_info *info;
3448 info = kzalloc(sizeof(*info), GFP_KERNEL);
3452 inner_domain = irq_domain_create_tree(handle, &its_domain_ops, its);
3453 if (!inner_domain) {
3458 inner_domain->parent = its_parent;
3459 irq_domain_update_bus_token(inner_domain, DOMAIN_BUS_NEXUS);
3460 inner_domain->flags |= its->msi_domain_flags;
3461 info->ops = &its_msi_domain_ops;
3463 inner_domain->host_data = info;
3468 static int its_init_vpe_domain(void)
3470 struct its_node *its;
3474 if (gic_rdists->has_direct_lpi) {
3475 pr_info("ITS: Using DirectLPI for VPE invalidation\n");
3479 /* Any ITS will do, even if not v4 */
3480 its = list_first_entry(&its_nodes, struct its_node, entry);
3482 entries = roundup_pow_of_two(nr_cpu_ids);
3483 vpe_proxy.vpes = kcalloc(entries, sizeof(*vpe_proxy.vpes),
3485 if (!vpe_proxy.vpes) {
3486 pr_err("ITS: Can't allocate GICv4 proxy device array\n");
3490 /* Use the last possible DevID */
3491 devid = GENMASK(its->device_ids - 1, 0);
3492 vpe_proxy.dev = its_create_device(its, devid, entries, false);
3493 if (!vpe_proxy.dev) {
3494 kfree(vpe_proxy.vpes);
3495 pr_err("ITS: Can't allocate GICv4 proxy device\n");
3499 BUG_ON(entries > vpe_proxy.dev->nr_ites);
3501 raw_spin_lock_init(&vpe_proxy.lock);
3502 vpe_proxy.next_victim = 0;
3503 pr_info("ITS: Allocated DevID %x as GICv4 proxy device (%d slots)\n",
3504 devid, vpe_proxy.dev->nr_ites);
3509 static int __init its_compute_its_list_map(struct resource *res,
3510 void __iomem *its_base)
3516 * This is assumed to be done early enough that we're
3517 * guaranteed to be single-threaded, hence no
3518 * locking. Should this change, we should address
3521 its_number = find_first_zero_bit(&its_list_map, GICv4_ITS_LIST_MAX);
3522 if (its_number >= GICv4_ITS_LIST_MAX) {
3523 pr_err("ITS@%pa: No ITSList entry available!\n",
3528 ctlr = readl_relaxed(its_base + GITS_CTLR);
3529 ctlr &= ~GITS_CTLR_ITS_NUMBER;
3530 ctlr |= its_number << GITS_CTLR_ITS_NUMBER_SHIFT;
3531 writel_relaxed(ctlr, its_base + GITS_CTLR);
3532 ctlr = readl_relaxed(its_base + GITS_CTLR);
3533 if ((ctlr & GITS_CTLR_ITS_NUMBER) != (its_number << GITS_CTLR_ITS_NUMBER_SHIFT)) {
3534 its_number = ctlr & GITS_CTLR_ITS_NUMBER;
3535 its_number >>= GITS_CTLR_ITS_NUMBER_SHIFT;
3538 if (test_and_set_bit(its_number, &its_list_map)) {
3539 pr_err("ITS@%pa: Duplicate ITSList entry %d\n",
3540 &res->start, its_number);
3547 static int __init its_probe_one(struct resource *res,
3548 struct fwnode_handle *handle, int numa_node)
3550 struct its_node *its;
3551 void __iomem *its_base;
3553 u64 baser, tmp, typer;
3557 its_base = ioremap(res->start, resource_size(res));
3559 pr_warn("ITS@%pa: Unable to map ITS registers\n", &res->start);
3563 val = readl_relaxed(its_base + GITS_PIDR2) & GIC_PIDR2_ARCH_MASK;
3564 if (val != 0x30 && val != 0x40) {
3565 pr_warn("ITS@%pa: No ITS detected, giving up\n", &res->start);
3570 err = its_force_quiescent(its_base);
3572 pr_warn("ITS@%pa: Failed to quiesce, giving up\n", &res->start);
3576 pr_info("ITS %pR\n", res);
3578 its = kzalloc(sizeof(*its), GFP_KERNEL);
3584 raw_spin_lock_init(&its->lock);
3585 mutex_init(&its->dev_alloc_lock);
3586 INIT_LIST_HEAD(&its->entry);
3587 INIT_LIST_HEAD(&its->its_device_list);
3588 typer = gic_read_typer(its_base + GITS_TYPER);
3589 its->base = its_base;
3590 its->phys_base = res->start;
3591 its->ite_size = GITS_TYPER_ITT_ENTRY_SIZE(typer);
3592 its->device_ids = GITS_TYPER_DEVBITS(typer);
3593 its->is_v4 = !!(typer & GITS_TYPER_VLPIS);
3595 if (!(typer & GITS_TYPER_VMOVP)) {
3596 err = its_compute_its_list_map(res, its_base);
3602 pr_info("ITS@%pa: Using ITS number %d\n",
3605 pr_info("ITS@%pa: Single VMOVP capable\n", &res->start);
3609 its->numa_node = numa_node;
3611 page = alloc_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO,
3612 get_order(ITS_CMD_QUEUE_SZ));
3617 its->cmd_base = (void *)page_address(page);
3618 its->cmd_write = its->cmd_base;
3619 its->fwnode_handle = handle;
3620 its->get_msi_base = its_irq_get_msi_base;
3621 its->msi_domain_flags = IRQ_DOMAIN_FLAG_MSI_REMAP;
3623 its_enable_quirks(its);
3625 err = its_alloc_tables(its);
3629 err = its_alloc_collections(its);
3631 goto out_free_tables;
3633 baser = (virt_to_phys(its->cmd_base) |
3634 GITS_CBASER_RaWaWb |
3635 GITS_CBASER_InnerShareable |
3636 (ITS_CMD_QUEUE_SZ / SZ_4K - 1) |
3639 gits_write_cbaser(baser, its->base + GITS_CBASER);
3640 tmp = gits_read_cbaser(its->base + GITS_CBASER);
3642 if ((tmp ^ baser) & GITS_CBASER_SHAREABILITY_MASK) {
3643 if (!(tmp & GITS_CBASER_SHAREABILITY_MASK)) {
3645 * The HW reports non-shareable, we must
3646 * remove the cacheability attributes as
3649 baser &= ~(GITS_CBASER_SHAREABILITY_MASK |
3650 GITS_CBASER_CACHEABILITY_MASK);
3651 baser |= GITS_CBASER_nC;
3652 gits_write_cbaser(baser, its->base + GITS_CBASER);
3654 pr_info("ITS: using cache flushing for cmd queue\n");
3655 its->flags |= ITS_FLAGS_CMDQ_NEEDS_FLUSHING;
3658 gits_write_cwriter(0, its->base + GITS_CWRITER);
3659 ctlr = readl_relaxed(its->base + GITS_CTLR);
3660 ctlr |= GITS_CTLR_ENABLE;
3662 ctlr |= GITS_CTLR_ImDe;
3663 writel_relaxed(ctlr, its->base + GITS_CTLR);
3665 if (GITS_TYPER_HCC(typer))
3666 its->flags |= ITS_FLAGS_SAVE_SUSPEND_STATE;
3668 err = its_init_domain(handle, its);
3670 goto out_free_tables;
3672 raw_spin_lock(&its_lock);
3673 list_add(&its->entry, &its_nodes);
3674 raw_spin_unlock(&its_lock);
3679 its_free_tables(its);
3681 free_pages((unsigned long)its->cmd_base, get_order(ITS_CMD_QUEUE_SZ));
3686 pr_err("ITS@%pa: failed probing (%d)\n", &res->start, err);
3690 static bool gic_rdists_supports_plpis(void)
3692 return !!(gic_read_typer(gic_data_rdist_rd_base() + GICR_TYPER) & GICR_TYPER_PLPIS);
3695 static int redist_disable_lpis(void)
3697 void __iomem *rbase = gic_data_rdist_rd_base();
3698 u64 timeout = USEC_PER_SEC;
3701 if (!gic_rdists_supports_plpis()) {
3702 pr_info("CPU%d: LPIs not supported\n", smp_processor_id());
3706 val = readl_relaxed(rbase + GICR_CTLR);
3707 if (!(val & GICR_CTLR_ENABLE_LPIS))
3711 * If coming via a CPU hotplug event, we don't need to disable
3712 * LPIs before trying to re-enable them. They are already
3713 * configured and all is well in the world.
3715 * If running with preallocated tables, there is nothing to do.
3717 if (gic_data_rdist()->lpi_enabled ||
3718 (gic_rdists->flags & RDIST_FLAGS_RD_TABLES_PREALLOCATED))
3722 * From that point on, we only try to do some damage control.
3724 pr_warn("GICv3: CPU%d: Booted with LPIs enabled, memory probably corrupted\n",
3725 smp_processor_id());
3726 add_taint(TAINT_CRAP, LOCKDEP_STILL_OK);
3729 val &= ~GICR_CTLR_ENABLE_LPIS;
3730 writel_relaxed(val, rbase + GICR_CTLR);
3732 /* Make sure any change to GICR_CTLR is observable by the GIC */
3736 * Software must observe RWP==0 after clearing GICR_CTLR.EnableLPIs
3737 * from 1 to 0 before programming GICR_PEND{PROP}BASER registers.
3738 * Error out if we time out waiting for RWP to clear.
3740 while (readl_relaxed(rbase + GICR_CTLR) & GICR_CTLR_RWP) {
3742 pr_err("CPU%d: Timeout while disabling LPIs\n",
3743 smp_processor_id());
3751 * After it has been written to 1, it is IMPLEMENTATION
3752 * DEFINED whether GICR_CTLR.EnableLPI becomes RES1 or can be
3753 * cleared to 0. Error out if clearing the bit failed.
3755 if (readl_relaxed(rbase + GICR_CTLR) & GICR_CTLR_ENABLE_LPIS) {
3756 pr_err("CPU%d: Failed to disable LPIs\n", smp_processor_id());
3763 int its_cpu_init(void)
3765 if (!list_empty(&its_nodes)) {
3768 ret = redist_disable_lpis();
3772 its_cpu_init_lpis();
3773 its_cpu_init_collections();
3779 static const struct of_device_id its_device_id[] = {
3780 { .compatible = "arm,gic-v3-its", },
3784 static int __init its_of_probe(struct device_node *node)
3786 struct device_node *np;
3787 struct resource res;
3789 for (np = of_find_matching_node(node, its_device_id); np;
3790 np = of_find_matching_node(np, its_device_id)) {
3791 if (!of_device_is_available(np))
3793 if (!of_property_read_bool(np, "msi-controller")) {
3794 pr_warn("%pOF: no msi-controller property, ITS ignored\n",
3799 if (of_address_to_resource(np, 0, &res)) {
3800 pr_warn("%pOF: no regs?\n", np);
3804 its_probe_one(&res, &np->fwnode, of_node_to_nid(np));
3811 #define ACPI_GICV3_ITS_MEM_SIZE (SZ_128K)
3813 #ifdef CONFIG_ACPI_NUMA
3814 struct its_srat_map {
3821 static struct its_srat_map *its_srat_maps __initdata;
3822 static int its_in_srat __initdata;
3824 static int __init acpi_get_its_numa_node(u32 its_id)
3828 for (i = 0; i < its_in_srat; i++) {
3829 if (its_id == its_srat_maps[i].its_id)
3830 return its_srat_maps[i].numa_node;
3832 return NUMA_NO_NODE;
3835 static int __init gic_acpi_match_srat_its(union acpi_subtable_headers *header,
3836 const unsigned long end)
3841 static int __init gic_acpi_parse_srat_its(union acpi_subtable_headers *header,
3842 const unsigned long end)
3845 struct acpi_srat_gic_its_affinity *its_affinity;
3847 its_affinity = (struct acpi_srat_gic_its_affinity *)header;
3851 if (its_affinity->header.length < sizeof(*its_affinity)) {
3852 pr_err("SRAT: Invalid header length %d in ITS affinity\n",
3853 its_affinity->header.length);
3857 node = acpi_map_pxm_to_node(its_affinity->proximity_domain);
3859 if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) {
3860 pr_err("SRAT: Invalid NUMA node %d in ITS affinity\n", node);
3864 its_srat_maps[its_in_srat].numa_node = node;
3865 its_srat_maps[its_in_srat].its_id = its_affinity->its_id;
3867 pr_info("SRAT: PXM %d -> ITS %d -> Node %d\n",
3868 its_affinity->proximity_domain, its_affinity->its_id, node);
3873 static void __init acpi_table_parse_srat_its(void)
3877 count = acpi_table_parse_entries(ACPI_SIG_SRAT,
3878 sizeof(struct acpi_table_srat),
3879 ACPI_SRAT_TYPE_GIC_ITS_AFFINITY,
3880 gic_acpi_match_srat_its, 0);
3884 its_srat_maps = kmalloc_array(count, sizeof(struct its_srat_map),
3886 if (!its_srat_maps) {
3887 pr_warn("SRAT: Failed to allocate memory for its_srat_maps!\n");
3891 acpi_table_parse_entries(ACPI_SIG_SRAT,
3892 sizeof(struct acpi_table_srat),
3893 ACPI_SRAT_TYPE_GIC_ITS_AFFINITY,
3894 gic_acpi_parse_srat_its, 0);
3897 /* free the its_srat_maps after ITS probing */
3898 static void __init acpi_its_srat_maps_free(void)
3900 kfree(its_srat_maps);
3903 static void __init acpi_table_parse_srat_its(void) { }
3904 static int __init acpi_get_its_numa_node(u32 its_id) { return NUMA_NO_NODE; }
3905 static void __init acpi_its_srat_maps_free(void) { }
3908 static int __init gic_acpi_parse_madt_its(union acpi_subtable_headers *header,
3909 const unsigned long end)
3911 struct acpi_madt_generic_translator *its_entry;
3912 struct fwnode_handle *dom_handle;
3913 struct resource res;
3916 its_entry = (struct acpi_madt_generic_translator *)header;
3917 memset(&res, 0, sizeof(res));
3918 res.start = its_entry->base_address;
3919 res.end = its_entry->base_address + ACPI_GICV3_ITS_MEM_SIZE - 1;
3920 res.flags = IORESOURCE_MEM;
3922 dom_handle = irq_domain_alloc_fwnode((void *)its_entry->base_address);
3924 pr_err("ITS@%pa: Unable to allocate GICv3 ITS domain token\n",
3929 err = iort_register_domain_token(its_entry->translation_id, res.start,
3932 pr_err("ITS@%pa: Unable to register GICv3 ITS domain token (ITS ID %d) to IORT\n",
3933 &res.start, its_entry->translation_id);
3937 err = its_probe_one(&res, dom_handle,
3938 acpi_get_its_numa_node(its_entry->translation_id));
3942 iort_deregister_domain_token(its_entry->translation_id);
3944 irq_domain_free_fwnode(dom_handle);
3948 static void __init its_acpi_probe(void)
3950 acpi_table_parse_srat_its();
3951 acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,
3952 gic_acpi_parse_madt_its, 0);
3953 acpi_its_srat_maps_free();
3956 static void __init its_acpi_probe(void) { }
3959 int __init its_init(struct fwnode_handle *handle, struct rdists *rdists,
3960 struct irq_domain *parent_domain)
3962 struct device_node *of_node;
3963 struct its_node *its;
3964 bool has_v4 = false;
3967 its_parent = parent_domain;
3968 of_node = to_of_node(handle);
3970 its_of_probe(of_node);
3974 if (list_empty(&its_nodes)) {
3975 pr_warn("ITS: No ITS available, not enabling LPIs\n");
3979 gic_rdists = rdists;
3981 err = allocate_lpi_tables();
3985 list_for_each_entry(its, &its_nodes, entry)
3986 has_v4 |= its->is_v4;
3988 if (has_v4 & rdists->has_vlpis) {
3989 if (its_init_vpe_domain() ||
3990 its_init_v4(parent_domain, &its_vpe_domain_ops)) {
3991 rdists->has_vlpis = false;
3992 pr_err("ITS: Disabling GICv4 support\n");
3996 register_syscore_ops(&its_syscore_ops);