| /* |
| * Copyright (C) 2013, 2014 ARM Limited, All Rights Reserved. |
| * Author: Marc Zyngier <marc.zyngier@arm.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <linux/bitmap.h> |
| #include <linux/cpu.h> |
| #include <linux/delay.h> |
| #include <linux/interrupt.h> |
| #include <linux/log2.h> |
| #include <linux/mm.h> |
| #include <linux/msi.h> |
| #include <linux/of.h> |
| #include <linux/of_address.h> |
| #include <linux/of_irq.h> |
| #include <linux/of_pci.h> |
| #include <linux/of_platform.h> |
| #include <linux/percpu.h> |
| #include <linux/slab.h> |
| |
| #include <linux/irqchip.h> |
| #include <linux/irqchip/arm-gic-v3.h> |
| |
| #include <asm/cacheflush.h> |
| #include <asm/cputype.h> |
| #include <asm/exception.h> |
| |
| #include "irq-gic-common.h" |
| |
| #define ITS_FLAGS_CMDQ_NEEDS_FLUSHING (1ULL << 0) |
| #define ITS_FLAGS_WORKAROUND_CAVIUM_22375 (1ULL << 1) |
| |
| #define RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING (1 << 0) |
| |
| /* |
| * Collection structure - just an ID, and a redistributor address to |
| * ping. We use one per CPU as a bag of interrupts assigned to this |
| * CPU. |
| */ |
| struct its_collection { |
| u64 target_address; |
| u16 col_id; |
| }; |
| |
| /* |
| * The ITS structure - contains most of the infrastructure, with the |
| * top-level MSI domain, the command queue, the collections, and the |
| * list of devices writing to it. |
| */ |
| struct its_node { |
| raw_spinlock_t lock; |
| struct list_head entry; |
| void __iomem *base; |
| unsigned long phys_base; |
| struct its_cmd_block *cmd_base; |
| struct its_cmd_block *cmd_write; |
| struct { |
| void *base; |
| u32 order; |
| } tables[GITS_BASER_NR_REGS]; |
| struct its_collection *collections; |
| struct list_head its_device_list; |
| u64 flags; |
| u32 ite_size; |
| }; |
| |
| #define ITS_ITT_ALIGN SZ_256 |
| |
| struct event_lpi_map { |
| unsigned long *lpi_map; |
| u16 *col_map; |
| irq_hw_number_t lpi_base; |
| int nr_lpis; |
| }; |
| |
| /* |
| * The ITS view of a device - belongs to an ITS, a collection, owns an |
| * interrupt translation table, and a list of interrupts. |
| */ |
| struct its_device { |
| struct list_head entry; |
| struct its_node *its; |
| struct event_lpi_map event_map; |
| void *itt; |
| u32 nr_ites; |
| u32 device_id; |
| }; |
| |
| static LIST_HEAD(its_nodes); |
| static DEFINE_SPINLOCK(its_lock); |
| static struct device_node *gic_root_node; |
| static struct rdists *gic_rdists; |
| |
| #define gic_data_rdist() (raw_cpu_ptr(gic_rdists->rdist)) |
| #define gic_data_rdist_rd_base() (gic_data_rdist()->rd_base) |
| |
| static struct its_collection *dev_event_to_col(struct its_device *its_dev, |
| u32 event) |
| { |
| struct its_node *its = its_dev->its; |
| |
| return its->collections + its_dev->event_map.col_map[event]; |
| } |
| |
| /* |
| * ITS command descriptors - parameters to be encoded in a command |
| * block. |
| */ |
| struct its_cmd_desc { |
| union { |
| struct { |
| struct its_device *dev; |
| u32 event_id; |
| } its_inv_cmd; |
| |
| struct { |
| struct its_device *dev; |
| u32 event_id; |
| } its_int_cmd; |
| |
| struct { |
| struct its_device *dev; |
| int valid; |
| } its_mapd_cmd; |
| |
| struct { |
| struct its_collection *col; |
| int valid; |
| } its_mapc_cmd; |
| |
| struct { |
| struct its_device *dev; |
| u32 phys_id; |
| u32 event_id; |
| } its_mapvi_cmd; |
| |
| struct { |
| struct its_device *dev; |
| struct its_collection *col; |
| u32 event_id; |
| } its_movi_cmd; |
| |
| struct { |
| struct its_device *dev; |
| u32 event_id; |
| } its_discard_cmd; |
| |
| struct { |
| struct its_collection *col; |
| } its_invall_cmd; |
| }; |
| }; |
| |
| /* |
| * The ITS command block, which is what the ITS actually parses. |
| */ |
| struct its_cmd_block { |
| u64 raw_cmd[4]; |
| }; |
| |
| #define ITS_CMD_QUEUE_SZ SZ_64K |
| #define ITS_CMD_QUEUE_NR_ENTRIES (ITS_CMD_QUEUE_SZ / sizeof(struct its_cmd_block)) |
| |
| typedef struct its_collection *(*its_cmd_builder_t)(struct its_cmd_block *, |
| struct its_cmd_desc *); |
| |
| static void its_encode_cmd(struct its_cmd_block *cmd, u8 cmd_nr) |
| { |
| cmd->raw_cmd[0] &= ~0xffUL; |
| cmd->raw_cmd[0] |= cmd_nr; |
| } |
| |
| static void its_encode_devid(struct its_cmd_block *cmd, u32 devid) |
| { |
| cmd->raw_cmd[0] &= BIT_ULL(32) - 1; |
| cmd->raw_cmd[0] |= ((u64)devid) << 32; |
| } |
| |
| static void its_encode_event_id(struct its_cmd_block *cmd, u32 id) |
| { |
| cmd->raw_cmd[1] &= ~0xffffffffUL; |
| cmd->raw_cmd[1] |= id; |
| } |
| |
| static void its_encode_phys_id(struct its_cmd_block *cmd, u32 phys_id) |
| { |
| cmd->raw_cmd[1] &= 0xffffffffUL; |
| cmd->raw_cmd[1] |= ((u64)phys_id) << 32; |
| } |
| |
| static void its_encode_size(struct its_cmd_block *cmd, u8 size) |
| { |
| cmd->raw_cmd[1] &= ~0x1fUL; |
| cmd->raw_cmd[1] |= size & 0x1f; |
| } |
| |
| static void its_encode_itt(struct its_cmd_block *cmd, u64 itt_addr) |
| { |
| cmd->raw_cmd[2] &= ~0xffffffffffffUL; |
| cmd->raw_cmd[2] |= itt_addr & 0xffffffffff00UL; |
| } |
| |
| static void its_encode_valid(struct its_cmd_block *cmd, int valid) |
| { |
| cmd->raw_cmd[2] &= ~(1UL << 63); |
| cmd->raw_cmd[2] |= ((u64)!!valid) << 63; |
| } |
| |
| static void its_encode_target(struct its_cmd_block *cmd, u64 target_addr) |
| { |
| cmd->raw_cmd[2] &= ~(0xffffffffUL << 16); |
| cmd->raw_cmd[2] |= (target_addr & (0xffffffffUL << 16)); |
| } |
| |
| static void its_encode_collection(struct its_cmd_block *cmd, u16 col) |
| { |
| cmd->raw_cmd[2] &= ~0xffffUL; |
| cmd->raw_cmd[2] |= col; |
| } |
| |
| static inline void its_fixup_cmd(struct its_cmd_block *cmd) |
| { |
| /* Let's fixup BE commands */ |
| cmd->raw_cmd[0] = cpu_to_le64(cmd->raw_cmd[0]); |
| cmd->raw_cmd[1] = cpu_to_le64(cmd->raw_cmd[1]); |
| cmd->raw_cmd[2] = cpu_to_le64(cmd->raw_cmd[2]); |
| cmd->raw_cmd[3] = cpu_to_le64(cmd->raw_cmd[3]); |
| } |
| |
| static struct its_collection *its_build_mapd_cmd(struct its_cmd_block *cmd, |
| struct its_cmd_desc *desc) |
| { |
| unsigned long itt_addr; |
| u8 size = ilog2(desc->its_mapd_cmd.dev->nr_ites); |
| |
| itt_addr = virt_to_phys(desc->its_mapd_cmd.dev->itt); |
| itt_addr = ALIGN(itt_addr, ITS_ITT_ALIGN); |
| |
| its_encode_cmd(cmd, GITS_CMD_MAPD); |
| its_encode_devid(cmd, desc->its_mapd_cmd.dev->device_id); |
| its_encode_size(cmd, size - 1); |
| its_encode_itt(cmd, itt_addr); |
| its_encode_valid(cmd, desc->its_mapd_cmd.valid); |
| |
| its_fixup_cmd(cmd); |
| |
| return NULL; |
| } |
| |
| static struct its_collection *its_build_mapc_cmd(struct its_cmd_block *cmd, |
| struct its_cmd_desc *desc) |
| { |
| its_encode_cmd(cmd, GITS_CMD_MAPC); |
| its_encode_collection(cmd, desc->its_mapc_cmd.col->col_id); |
| its_encode_target(cmd, desc->its_mapc_cmd.col->target_address); |
| its_encode_valid(cmd, desc->its_mapc_cmd.valid); |
| |
| its_fixup_cmd(cmd); |
| |
| return desc->its_mapc_cmd.col; |
| } |
| |
| static struct its_collection *its_build_mapvi_cmd(struct its_cmd_block *cmd, |
| struct its_cmd_desc *desc) |
| { |
| struct its_collection *col; |
| |
| col = dev_event_to_col(desc->its_mapvi_cmd.dev, |
| desc->its_mapvi_cmd.event_id); |
| |
| its_encode_cmd(cmd, GITS_CMD_MAPVI); |
| its_encode_devid(cmd, desc->its_mapvi_cmd.dev->device_id); |
| its_encode_event_id(cmd, desc->its_mapvi_cmd.event_id); |
| its_encode_phys_id(cmd, desc->its_mapvi_cmd.phys_id); |
| its_encode_collection(cmd, col->col_id); |
| |
| its_fixup_cmd(cmd); |
| |
| return col; |
| } |
| |
| static struct its_collection *its_build_movi_cmd(struct its_cmd_block *cmd, |
| struct its_cmd_desc *desc) |
| { |
| struct its_collection *col; |
| |
| col = dev_event_to_col(desc->its_movi_cmd.dev, |
| desc->its_movi_cmd.event_id); |
| |
| its_encode_cmd(cmd, GITS_CMD_MOVI); |
| its_encode_devid(cmd, desc->its_movi_cmd.dev->device_id); |
| its_encode_event_id(cmd, desc->its_movi_cmd.event_id); |
| its_encode_collection(cmd, desc->its_movi_cmd.col->col_id); |
| |
| its_fixup_cmd(cmd); |
| |
| return col; |
| } |
| |
| static struct its_collection *its_build_discard_cmd(struct its_cmd_block *cmd, |
| struct its_cmd_desc *desc) |
| { |
| struct its_collection *col; |
| |
| col = dev_event_to_col(desc->its_discard_cmd.dev, |
| desc->its_discard_cmd.event_id); |
| |
| its_encode_cmd(cmd, GITS_CMD_DISCARD); |
| its_encode_devid(cmd, desc->its_discard_cmd.dev->device_id); |
| its_encode_event_id(cmd, desc->its_discard_cmd.event_id); |
| |
| its_fixup_cmd(cmd); |
| |
| return col; |
| } |
| |
| static struct its_collection *its_build_inv_cmd(struct its_cmd_block *cmd, |
| struct its_cmd_desc *desc) |
| { |
| struct its_collection *col; |
| |
| col = dev_event_to_col(desc->its_inv_cmd.dev, |
| desc->its_inv_cmd.event_id); |
| |
| its_encode_cmd(cmd, GITS_CMD_INV); |
| its_encode_devid(cmd, desc->its_inv_cmd.dev->device_id); |
| its_encode_event_id(cmd, desc->its_inv_cmd.event_id); |
| |
| its_fixup_cmd(cmd); |
| |
| return col; |
| } |
| |
| static struct its_collection *its_build_invall_cmd(struct its_cmd_block *cmd, |
| struct its_cmd_desc *desc) |
| { |
| its_encode_cmd(cmd, GITS_CMD_INVALL); |
| its_encode_collection(cmd, desc->its_mapc_cmd.col->col_id); |
| |
| its_fixup_cmd(cmd); |
| |
| return NULL; |
| } |
| |
| static u64 its_cmd_ptr_to_offset(struct its_node *its, |
| struct its_cmd_block *ptr) |
| { |
| return (ptr - its->cmd_base) * sizeof(*ptr); |
| } |
| |
| static int its_queue_full(struct its_node *its) |
| { |
| int widx; |
| int ridx; |
| |
| widx = its->cmd_write - its->cmd_base; |
| ridx = readl_relaxed(its->base + GITS_CREADR) / sizeof(struct its_cmd_block); |
| |
| /* This is incredibly unlikely to happen, unless the ITS locks up. */ |
| if (((widx + 1) % ITS_CMD_QUEUE_NR_ENTRIES) == ridx) |
| return 1; |
| |
| return 0; |
| } |
| |
| static struct its_cmd_block *its_allocate_entry(struct its_node *its) |
| { |
| struct its_cmd_block *cmd; |
| u32 count = 1000000; /* 1s! */ |
| |
| while (its_queue_full(its)) { |
| count--; |
| if (!count) { |
| pr_err_ratelimited("ITS queue not draining\n"); |
| return NULL; |
| } |
| cpu_relax(); |
| udelay(1); |
| } |
| |
| cmd = its->cmd_write++; |
| |
| /* Handle queue wrapping */ |
| if (its->cmd_write == (its->cmd_base + ITS_CMD_QUEUE_NR_ENTRIES)) |
| its->cmd_write = its->cmd_base; |
| |
| return cmd; |
| } |
| |
| static struct its_cmd_block *its_post_commands(struct its_node *its) |
| { |
| u64 wr = its_cmd_ptr_to_offset(its, its->cmd_write); |
| |
| writel_relaxed(wr, its->base + GITS_CWRITER); |
| |
| return its->cmd_write; |
| } |
| |
| static void its_flush_cmd(struct its_node *its, struct its_cmd_block *cmd) |
| { |
| /* |
| * Make sure the commands written to memory are observable by |
| * the ITS. |
| */ |
| if (its->flags & ITS_FLAGS_CMDQ_NEEDS_FLUSHING) |
| __flush_dcache_area(cmd, sizeof(*cmd)); |
| else |
| dsb(ishst); |
| } |
| |
| static void its_wait_for_range_completion(struct its_node *its, |
| struct its_cmd_block *from, |
| struct its_cmd_block *to) |
| { |
| u64 rd_idx, from_idx, to_idx; |
| u32 count = 1000000; /* 1s! */ |
| |
| from_idx = its_cmd_ptr_to_offset(its, from); |
| to_idx = its_cmd_ptr_to_offset(its, to); |
| |
| while (1) { |
| rd_idx = readl_relaxed(its->base + GITS_CREADR); |
| if (rd_idx >= to_idx || rd_idx < from_idx) |
| break; |
| |
| count--; |
| if (!count) { |
| pr_err_ratelimited("ITS queue timeout\n"); |
| return; |
| } |
| cpu_relax(); |
| udelay(1); |
| } |
| } |
| |
| static void its_send_single_command(struct its_node *its, |
| its_cmd_builder_t builder, |
| struct its_cmd_desc *desc) |
| { |
| struct its_cmd_block *cmd, *sync_cmd, *next_cmd; |
| struct its_collection *sync_col; |
| unsigned long flags; |
| |
| raw_spin_lock_irqsave(&its->lock, flags); |
| |
| cmd = its_allocate_entry(its); |
| if (!cmd) { /* We're soooooo screewed... */ |
| pr_err_ratelimited("ITS can't allocate, dropping command\n"); |
| raw_spin_unlock_irqrestore(&its->lock, flags); |
| return; |
| } |
| sync_col = builder(cmd, desc); |
| its_flush_cmd(its, cmd); |
| |
| if (sync_col) { |
| sync_cmd = its_allocate_entry(its); |
| if (!sync_cmd) { |
| pr_err_ratelimited("ITS can't SYNC, skipping\n"); |
| goto post; |
| } |
| its_encode_cmd(sync_cmd, GITS_CMD_SYNC); |
| its_encode_target(sync_cmd, sync_col->target_address); |
| its_fixup_cmd(sync_cmd); |
| its_flush_cmd(its, sync_cmd); |
| } |
| |
| post: |
| next_cmd = its_post_commands(its); |
| raw_spin_unlock_irqrestore(&its->lock, flags); |
| |
| its_wait_for_range_completion(its, cmd, next_cmd); |
| } |
| |
| static void its_send_inv(struct its_device *dev, u32 event_id) |
| { |
| struct its_cmd_desc desc; |
| |
| desc.its_inv_cmd.dev = dev; |
| desc.its_inv_cmd.event_id = event_id; |
| |
| its_send_single_command(dev->its, its_build_inv_cmd, &desc); |
| } |
| |
| static void its_send_mapd(struct its_device *dev, int valid) |
| { |
| struct its_cmd_desc desc; |
| |
| desc.its_mapd_cmd.dev = dev; |
| desc.its_mapd_cmd.valid = !!valid; |
| |
| its_send_single_command(dev->its, its_build_mapd_cmd, &desc); |
| } |
| |
| static void its_send_mapc(struct its_node *its, struct its_collection *col, |
| int valid) |
| { |
| struct its_cmd_desc desc; |
| |
| desc.its_mapc_cmd.col = col; |
| desc.its_mapc_cmd.valid = !!valid; |
| |
| its_send_single_command(its, its_build_mapc_cmd, &desc); |
| } |
| |
| static void its_send_mapvi(struct its_device *dev, u32 irq_id, u32 id) |
| { |
| struct its_cmd_desc desc; |
| |
| desc.its_mapvi_cmd.dev = dev; |
| desc.its_mapvi_cmd.phys_id = irq_id; |
| desc.its_mapvi_cmd.event_id = id; |
| |
| its_send_single_command(dev->its, its_build_mapvi_cmd, &desc); |
| } |
| |
| static void its_send_movi(struct its_device *dev, |
| struct its_collection *col, u32 id) |
| { |
| struct its_cmd_desc desc; |
| |
| desc.its_movi_cmd.dev = dev; |
| desc.its_movi_cmd.col = col; |
| desc.its_movi_cmd.event_id = id; |
| |
| its_send_single_command(dev->its, its_build_movi_cmd, &desc); |
| } |
| |
| static void its_send_discard(struct its_device *dev, u32 id) |
| { |
| struct its_cmd_desc desc; |
| |
| desc.its_discard_cmd.dev = dev; |
| desc.its_discard_cmd.event_id = id; |
| |
| its_send_single_command(dev->its, its_build_discard_cmd, &desc); |
| } |
| |
| static void its_send_invall(struct its_node *its, struct its_collection *col) |
| { |
| struct its_cmd_desc desc; |
| |
| desc.its_invall_cmd.col = col; |
| |
| its_send_single_command(its, its_build_invall_cmd, &desc); |
| } |
| |
| /* |
| * irqchip functions - assumes MSI, mostly. |
| */ |
| |
| static inline u32 its_get_event_id(struct irq_data *d) |
| { |
| struct its_device *its_dev = irq_data_get_irq_chip_data(d); |
| return d->hwirq - its_dev->event_map.lpi_base; |
| } |
| |
| static void lpi_set_config(struct irq_data *d, bool enable) |
| { |
| struct its_device *its_dev = irq_data_get_irq_chip_data(d); |
| irq_hw_number_t hwirq = d->hwirq; |
| u32 id = its_get_event_id(d); |
| u8 *cfg = page_address(gic_rdists->prop_page) + hwirq - 8192; |
| |
| if (enable) |
| *cfg |= LPI_PROP_ENABLED; |
| else |
| *cfg &= ~LPI_PROP_ENABLED; |
| |
| /* |
| * Make the above write visible to the redistributors. |
| * And yes, we're flushing exactly: One. Single. Byte. |
| * Humpf... |
| */ |
| if (gic_rdists->flags & RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING) |
| __flush_dcache_area(cfg, sizeof(*cfg)); |
| else |
| dsb(ishst); |
| its_send_inv(its_dev, id); |
| } |
| |
| static void its_mask_irq(struct irq_data *d) |
| { |
| lpi_set_config(d, false); |
| } |
| |
| static void its_unmask_irq(struct irq_data *d) |
| { |
| lpi_set_config(d, true); |
| } |
| |
| static void its_eoi_irq(struct irq_data *d) |
| { |
| gic_write_eoir(d->hwirq); |
| } |
| |
| static int its_set_affinity(struct irq_data *d, const struct cpumask *mask_val, |
| bool force) |
| { |
| unsigned int cpu = cpumask_any_and(mask_val, cpu_online_mask); |
| struct its_device *its_dev = irq_data_get_irq_chip_data(d); |
| struct its_collection *target_col; |
| u32 id = its_get_event_id(d); |
| |
| if (cpu >= nr_cpu_ids) |
| return -EINVAL; |
| |
| target_col = &its_dev->its->collections[cpu]; |
| its_send_movi(its_dev, target_col, id); |
| its_dev->event_map.col_map[id] = cpu; |
| |
| return IRQ_SET_MASK_OK_DONE; |
| } |
| |
| static void its_irq_compose_msi_msg(struct irq_data *d, struct msi_msg *msg) |
| { |
| struct its_device *its_dev = irq_data_get_irq_chip_data(d); |
| struct its_node *its; |
| u64 addr; |
| |
| its = its_dev->its; |
| addr = its->phys_base + GITS_TRANSLATER; |
| |
| msg->address_lo = addr & ((1UL << 32) - 1); |
| msg->address_hi = addr >> 32; |
| msg->data = its_get_event_id(d); |
| } |
| |
| static struct irq_chip its_irq_chip = { |
| .name = "ITS", |
| .irq_mask = its_mask_irq, |
| .irq_unmask = its_unmask_irq, |
| .irq_eoi = its_eoi_irq, |
| .irq_set_affinity = its_set_affinity, |
| .irq_compose_msi_msg = its_irq_compose_msi_msg, |
| }; |
| |
| /* |
| * How we allocate LPIs: |
| * |
| * The GIC has id_bits bits for interrupt identifiers. From there, we |
| * must subtract 8192 which are reserved for SGIs/PPIs/SPIs. Then, as |
| * we allocate LPIs by chunks of 32, we can shift the whole thing by 5 |
| * bits to the right. |
| * |
| * This gives us (((1UL << id_bits) - 8192) >> 5) possible allocations. |
| */ |
| #define IRQS_PER_CHUNK_SHIFT 5 |
| #define IRQS_PER_CHUNK (1 << IRQS_PER_CHUNK_SHIFT) |
| |
| static unsigned long *lpi_bitmap; |
| static u32 lpi_chunks; |
| static DEFINE_SPINLOCK(lpi_lock); |
| |
| static int its_lpi_to_chunk(int lpi) |
| { |
| return (lpi - 8192) >> IRQS_PER_CHUNK_SHIFT; |
| } |
| |
| static int its_chunk_to_lpi(int chunk) |
| { |
| return (chunk << IRQS_PER_CHUNK_SHIFT) + 8192; |
| } |
| |
| static int its_lpi_init(u32 id_bits) |
| { |
| lpi_chunks = its_lpi_to_chunk(1UL << id_bits); |
| |
| lpi_bitmap = kzalloc(BITS_TO_LONGS(lpi_chunks) * sizeof(long), |
| GFP_KERNEL); |
| if (!lpi_bitmap) { |
| lpi_chunks = 0; |
| return -ENOMEM; |
| } |
| |
| pr_info("ITS: Allocated %d chunks for LPIs\n", (int)lpi_chunks); |
| return 0; |
| } |
| |
| static unsigned long *its_lpi_alloc_chunks(int nr_irqs, int *base, int *nr_ids) |
| { |
| unsigned long *bitmap = NULL; |
| int chunk_id; |
| int nr_chunks; |
| int i; |
| |
| nr_chunks = DIV_ROUND_UP(nr_irqs, IRQS_PER_CHUNK); |
| |
| spin_lock(&lpi_lock); |
| |
| do { |
| chunk_id = bitmap_find_next_zero_area(lpi_bitmap, lpi_chunks, |
| 0, nr_chunks, 0); |
| if (chunk_id < lpi_chunks) |
| break; |
| |
| nr_chunks--; |
| } while (nr_chunks > 0); |
| |
| if (!nr_chunks) |
| goto out; |
| |
| bitmap = kzalloc(BITS_TO_LONGS(nr_chunks * IRQS_PER_CHUNK) * sizeof (long), |
| GFP_ATOMIC); |
| if (!bitmap) |
| goto out; |
| |
| for (i = 0; i < nr_chunks; i++) |
| set_bit(chunk_id + i, lpi_bitmap); |
| |
| *base = its_chunk_to_lpi(chunk_id); |
| *nr_ids = nr_chunks * IRQS_PER_CHUNK; |
| |
| out: |
| spin_unlock(&lpi_lock); |
| |
| if (!bitmap) |
| *base = *nr_ids = 0; |
| |
| return bitmap; |
| } |
| |
| static void its_lpi_free(struct event_lpi_map *map) |
| { |
| int base = map->lpi_base; |
| int nr_ids = map->nr_lpis; |
| int lpi; |
| |
| spin_lock(&lpi_lock); |
| |
| for (lpi = base; lpi < (base + nr_ids); lpi += IRQS_PER_CHUNK) { |
| int chunk = its_lpi_to_chunk(lpi); |
| BUG_ON(chunk > lpi_chunks); |
| if (test_bit(chunk, lpi_bitmap)) { |
| clear_bit(chunk, lpi_bitmap); |
| } else { |
| pr_err("Bad LPI chunk %d\n", chunk); |
| } |
| } |
| |
| spin_unlock(&lpi_lock); |
| |
| kfree(map->lpi_map); |
| kfree(map->col_map); |
| } |
| |
| /* |
| * We allocate 64kB for PROPBASE. That gives us at most 64K LPIs to |
| * deal with (one configuration byte per interrupt). PENDBASE has to |
| * be 64kB aligned (one bit per LPI, plus 8192 bits for SPI/PPI/SGI). |
| */ |
| #define LPI_PROPBASE_SZ SZ_64K |
| #define LPI_PENDBASE_SZ (LPI_PROPBASE_SZ / 8 + SZ_1K) |
| |
| /* |
| * This is how many bits of ID we need, including the useless ones. |
| */ |
| #define LPI_NRBITS ilog2(LPI_PROPBASE_SZ + SZ_8K) |
| |
| #define LPI_PROP_DEFAULT_PRIO 0xa0 |
| |
| static int __init its_alloc_lpi_tables(void) |
| { |
| phys_addr_t paddr; |
| |
| gic_rdists->prop_page = alloc_pages(GFP_NOWAIT, |
| get_order(LPI_PROPBASE_SZ)); |
| if (!gic_rdists->prop_page) { |
| pr_err("Failed to allocate PROPBASE\n"); |
| return -ENOMEM; |
| } |
| |
| paddr = page_to_phys(gic_rdists->prop_page); |
| pr_info("GIC: using LPI property table @%pa\n", &paddr); |
| |
| /* Priority 0xa0, Group-1, disabled */ |
| memset(page_address(gic_rdists->prop_page), |
| LPI_PROP_DEFAULT_PRIO | LPI_PROP_GROUP1, |
| LPI_PROPBASE_SZ); |
| |
| /* Make sure the GIC will observe the written configuration */ |
| __flush_dcache_area(page_address(gic_rdists->prop_page), LPI_PROPBASE_SZ); |
| |
| return 0; |
| } |
| |
| static const char *its_base_type_string[] = { |
| [GITS_BASER_TYPE_DEVICE] = "Devices", |
| [GITS_BASER_TYPE_VCPU] = "Virtual CPUs", |
| [GITS_BASER_TYPE_CPU] = "Physical CPUs", |
| [GITS_BASER_TYPE_COLLECTION] = "Interrupt Collections", |
| [GITS_BASER_TYPE_RESERVED5] = "Reserved (5)", |
| [GITS_BASER_TYPE_RESERVED6] = "Reserved (6)", |
| [GITS_BASER_TYPE_RESERVED7] = "Reserved (7)", |
| }; |
| |
| static void its_free_tables(struct its_node *its) |
| { |
| int i; |
| |
| for (i = 0; i < GITS_BASER_NR_REGS; i++) { |
| if (its->tables[i].base) { |
| free_pages((unsigned long)its->tables[i].base, |
| its->tables[i].order); |
| its->tables[i].base = NULL; |
| } |
| } |
| } |
| |
| static int its_alloc_tables(const char *node_name, struct its_node *its) |
| { |
| int err; |
| int i; |
| int psz = SZ_64K; |
| u64 shr = GITS_BASER_InnerShareable; |
| u64 cache; |
| u64 typer; |
| u32 ids; |
| |
| if (its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_22375) { |
| /* |
| * erratum 22375: only alloc 8MB table size |
| * erratum 24313: ignore memory access type |
| */ |
| cache = 0; |
| ids = 0x14; /* 20 bits, 8MB */ |
| } else { |
| cache = GITS_BASER_WaWb; |
| typer = readq_relaxed(its->base + GITS_TYPER); |
| ids = GITS_TYPER_DEVBITS(typer); |
| } |
| |
| for (i = 0; i < GITS_BASER_NR_REGS; i++) { |
| u64 val = readq_relaxed(its->base + GITS_BASER + i * 8); |
| u64 type = GITS_BASER_TYPE(val); |
| u64 entry_size = GITS_BASER_ENTRY_SIZE(val); |
| int order = get_order(psz); |
| int alloc_size; |
| int alloc_pages; |
| u64 tmp; |
| void *base; |
| |
| if (type == GITS_BASER_TYPE_NONE) |
| continue; |
| |
| /* |
| * Allocate as many entries as required to fit the |
| * range of device IDs that the ITS can grok... The ID |
| * space being incredibly sparse, this results in a |
| * massive waste of memory. |
| * |
| * For other tables, only allocate a single page. |
| */ |
| if (type == GITS_BASER_TYPE_DEVICE) { |
| /* |
| * 'order' was initialized earlier to the default page |
| * granule of the the ITS. We can't have an allocation |
| * smaller than that. If the requested allocation |
| * is smaller, round up to the default page granule. |
| */ |
| order = max(get_order((1UL << ids) * entry_size), |
| order); |
| if (order >= MAX_ORDER) { |
| order = MAX_ORDER - 1; |
| pr_warn("%s: Device Table too large, reduce its page order to %u\n", |
| node_name, order); |
| } |
| } |
| |
| alloc_size = (1 << order) * PAGE_SIZE; |
| retry_alloc_baser: |
| alloc_pages = (alloc_size / psz); |
| if (alloc_pages > GITS_BASER_PAGES_MAX) { |
| alloc_pages = GITS_BASER_PAGES_MAX; |
| order = get_order(GITS_BASER_PAGES_MAX * psz); |
| pr_warn("%s: Device Table too large, reduce its page order to %u (%u pages)\n", |
| node_name, order, alloc_pages); |
| } |
| |
| base = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, order); |
| if (!base) { |
| err = -ENOMEM; |
| goto out_free; |
| } |
| |
| its->tables[i].base = base; |
| its->tables[i].order = order; |
| |
| retry_baser: |
| val = (virt_to_phys(base) | |
| (type << GITS_BASER_TYPE_SHIFT) | |
| ((entry_size - 1) << GITS_BASER_ENTRY_SIZE_SHIFT) | |
| cache | |
| shr | |
| GITS_BASER_VALID); |
| |
| switch (psz) { |
| case SZ_4K: |
| val |= GITS_BASER_PAGE_SIZE_4K; |
| break; |
| case SZ_16K: |
| val |= GITS_BASER_PAGE_SIZE_16K; |
| break; |
| case SZ_64K: |
| val |= GITS_BASER_PAGE_SIZE_64K; |
| break; |
| } |
| |
| val |= alloc_pages - 1; |
| |
| writeq_relaxed(val, its->base + GITS_BASER + i * 8); |
| tmp = readq_relaxed(its->base + GITS_BASER + i * 8); |
| |
| if ((val ^ tmp) & GITS_BASER_SHAREABILITY_MASK) { |
| /* |
| * Shareability didn't stick. Just use |
| * whatever the read reported, which is likely |
| * to be the only thing this redistributor |
| * supports. If that's zero, make it |
| * non-cacheable as well. |
| */ |
| shr = tmp & GITS_BASER_SHAREABILITY_MASK; |
| if (!shr) { |
| cache = GITS_BASER_nC; |
| __flush_dcache_area(base, alloc_size); |
| } |
| goto retry_baser; |
| } |
| |
| if ((val ^ tmp) & GITS_BASER_PAGE_SIZE_MASK) { |
| /* |
| * Page size didn't stick. Let's try a smaller |
| * size and retry. If we reach 4K, then |
| * something is horribly wrong... |
| */ |
| free_pages((unsigned long)base, order); |
| its->tables[i].base = NULL; |
| |
| switch (psz) { |
| case SZ_16K: |
| psz = SZ_4K; |
| goto retry_alloc_baser; |
| case SZ_64K: |
| psz = SZ_16K; |
| goto retry_alloc_baser; |
| } |
| } |
| |
| if (val != tmp) { |
| pr_err("ITS: %s: GITS_BASER%d doesn't stick: %lx %lx\n", |
| node_name, i, |
| (unsigned long) val, (unsigned long) tmp); |
| err = -ENXIO; |
| goto out_free; |
| } |
| |
| pr_info("ITS: allocated %d %s @%lx (psz %dK, shr %d)\n", |
| (int)(alloc_size / entry_size), |
| its_base_type_string[type], |
| (unsigned long)virt_to_phys(base), |
| psz / SZ_1K, (int)shr >> GITS_BASER_SHAREABILITY_SHIFT); |
| } |
| |
| return 0; |
| |
| out_free: |
| its_free_tables(its); |
| |
| return err; |
| } |
| |
| static int its_alloc_collections(struct its_node *its) |
| { |
| its->collections = kzalloc(nr_cpu_ids * sizeof(*its->collections), |
| GFP_KERNEL); |
| if (!its->collections) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static void its_cpu_init_lpis(void) |
| { |
| void __iomem *rbase = gic_data_rdist_rd_base(); |
| struct page *pend_page; |
| u64 val, tmp; |
| |
| /* If we didn't allocate the pending table yet, do it now */ |
| pend_page = gic_data_rdist()->pend_page; |
| if (!pend_page) { |
| phys_addr_t paddr; |
| /* |
| * The pending pages have to be at least 64kB aligned, |
| * hence the 'max(LPI_PENDBASE_SZ, SZ_64K)' below. |
| */ |
| pend_page = alloc_pages(GFP_NOWAIT | __GFP_ZERO, |
| get_order(max(LPI_PENDBASE_SZ, SZ_64K))); |
| if (!pend_page) { |
| pr_err("Failed to allocate PENDBASE for CPU%d\n", |
| smp_processor_id()); |
| return; |
| } |
| |
| /* Make sure the GIC will observe the zero-ed page */ |
| __flush_dcache_area(page_address(pend_page), LPI_PENDBASE_SZ); |
| |
| paddr = page_to_phys(pend_page); |
| pr_info("CPU%d: using LPI pending table @%pa\n", |
| smp_processor_id(), &paddr); |
| gic_data_rdist()->pend_page = pend_page; |
| } |
| |
| /* Disable LPIs */ |
| val = readl_relaxed(rbase + GICR_CTLR); |
| val &= ~GICR_CTLR_ENABLE_LPIS; |
| writel_relaxed(val, rbase + GICR_CTLR); |
| |
| /* |
| * Make sure any change to the table is observable by the GIC. |
| */ |
| dsb(sy); |
| |
| /* set PROPBASE */ |
| val = (page_to_phys(gic_rdists->prop_page) | |
| GICR_PROPBASER_InnerShareable | |
| GICR_PROPBASER_WaWb | |
| ((LPI_NRBITS - 1) & GICR_PROPBASER_IDBITS_MASK)); |
| |
| writeq_relaxed(val, rbase + GICR_PROPBASER); |
| tmp = readq_relaxed(rbase + GICR_PROPBASER); |
| |
| if ((tmp ^ val) & GICR_PROPBASER_SHAREABILITY_MASK) { |
| if (!(tmp & GICR_PROPBASER_SHAREABILITY_MASK)) { |
| /* |
| * The HW reports non-shareable, we must |
| * remove the cacheability attributes as |
| * well. |
| */ |
| val &= ~(GICR_PROPBASER_SHAREABILITY_MASK | |
| GICR_PROPBASER_CACHEABILITY_MASK); |
| val |= GICR_PROPBASER_nC; |
| writeq_relaxed(val, rbase + GICR_PROPBASER); |
| } |
| pr_info_once("GIC: using cache flushing for LPI property table\n"); |
| gic_rdists->flags |= RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING; |
| } |
| |
| /* set PENDBASE */ |
| val = (page_to_phys(pend_page) | |
| GICR_PENDBASER_InnerShareable | |
| GICR_PENDBASER_WaWb); |
| |
| writeq_relaxed(val, rbase + GICR_PENDBASER); |
| tmp = readq_relaxed(rbase + GICR_PENDBASER); |
| |
| if (!(tmp & GICR_PENDBASER_SHAREABILITY_MASK)) { |
| /* |
| * The HW reports non-shareable, we must remove the |
| * cacheability attributes as well. |
| */ |
| val &= ~(GICR_PENDBASER_SHAREABILITY_MASK | |
| GICR_PENDBASER_CACHEABILITY_MASK); |
| val |= GICR_PENDBASER_nC; |
| writeq_relaxed(val, rbase + GICR_PENDBASER); |
| } |
| |
| /* Enable LPIs */ |
| val = readl_relaxed(rbase + GICR_CTLR); |
| val |= GICR_CTLR_ENABLE_LPIS; |
| writel_relaxed(val, rbase + GICR_CTLR); |
| |
| /* Make sure the GIC has seen the above */ |
| dsb(sy); |
| } |
| |
| static void its_cpu_init_collection(void) |
| { |
| struct its_node *its; |
| int cpu; |
| |
| spin_lock(&its_lock); |
| cpu = smp_processor_id(); |
| |
| list_for_each_entry(its, &its_nodes, entry) { |
| u64 target; |
| |
| /* |
| * We now have to bind each collection to its target |
| * redistributor. |
| */ |
| if (readq_relaxed(its->base + GITS_TYPER) & GITS_TYPER_PTA) { |
| /* |
| * This ITS wants the physical address of the |
| * redistributor. |
| */ |
| target = gic_data_rdist()->phys_base; |
| } else { |
| /* |
| * This ITS wants a linear CPU number. |
| */ |
| target = readq_relaxed(gic_data_rdist_rd_base() + GICR_TYPER); |
| target = GICR_TYPER_CPU_NUMBER(target) << 16; |
| } |
| |
| /* Perform collection mapping */ |
| its->collections[cpu].target_address = target; |
| its->collections[cpu].col_id = cpu; |
| |
| its_send_mapc(its, &its->collections[cpu], 1); |
| its_send_invall(its, &its->collections[cpu]); |
| } |
| |
| spin_unlock(&its_lock); |
| } |
| |
| static struct its_device *its_find_device(struct its_node *its, u32 dev_id) |
| { |
| struct its_device *its_dev = NULL, *tmp; |
| unsigned long flags; |
| |
| raw_spin_lock_irqsave(&its->lock, flags); |
| |
| list_for_each_entry(tmp, &its->its_device_list, entry) { |
| if (tmp->device_id == dev_id) { |
| its_dev = tmp; |
| break; |
| } |
| } |
| |
| raw_spin_unlock_irqrestore(&its->lock, flags); |
| |
| return its_dev; |
| } |
| |
| static struct its_device *its_create_device(struct its_node *its, u32 dev_id, |
| int nvecs) |
| { |
| struct its_device *dev; |
| unsigned long *lpi_map; |
| unsigned long flags; |
| u16 *col_map = NULL; |
| void *itt; |
| int lpi_base; |
| int nr_lpis; |
| int nr_ites; |
| int sz; |
| |
| dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| /* |
| * At least one bit of EventID is being used, hence a minimum |
| * of two entries. No, the architecture doesn't let you |
| * express an ITT with a single entry. |
| */ |
| nr_ites = max(2UL, roundup_pow_of_two(nvecs)); |
| sz = nr_ites * its->ite_size; |
| sz = max(sz, ITS_ITT_ALIGN) + ITS_ITT_ALIGN - 1; |
| itt = kzalloc(sz, GFP_KERNEL); |
| lpi_map = its_lpi_alloc_chunks(nvecs, &lpi_base, &nr_lpis); |
| if (lpi_map) |
| col_map = kzalloc(sizeof(*col_map) * nr_lpis, GFP_KERNEL); |
| |
| if (!dev || !itt || !lpi_map || !col_map) { |
| kfree(dev); |
| kfree(itt); |
| kfree(lpi_map); |
| kfree(col_map); |
| return NULL; |
| } |
| |
| __flush_dcache_area(itt, sz); |
| |
| dev->its = its; |
| dev->itt = itt; |
| dev->nr_ites = nr_ites; |
| dev->event_map.lpi_map = lpi_map; |
| dev->event_map.col_map = col_map; |
| dev->event_map.lpi_base = lpi_base; |
| dev->event_map.nr_lpis = nr_lpis; |
| dev->device_id = dev_id; |
| INIT_LIST_HEAD(&dev->entry); |
| |
| raw_spin_lock_irqsave(&its->lock, flags); |
| list_add(&dev->entry, &its->its_device_list); |
| raw_spin_unlock_irqrestore(&its->lock, flags); |
| |
| /* Map device to its ITT */ |
| its_send_mapd(dev, 1); |
| |
| return dev; |
| } |
| |
| static void its_free_device(struct its_device *its_dev) |
| { |
| unsigned long flags; |
| |
| raw_spin_lock_irqsave(&its_dev->its->lock, flags); |
| list_del(&its_dev->entry); |
| raw_spin_unlock_irqrestore(&its_dev->its->lock, flags); |
| kfree(its_dev->itt); |
| kfree(its_dev); |
| } |
| |
| static int its_alloc_device_irq(struct its_device *dev, irq_hw_number_t *hwirq) |
| { |
| int idx; |
| |
| idx = find_first_zero_bit(dev->event_map.lpi_map, |
| dev->event_map.nr_lpis); |
| if (idx == dev->event_map.nr_lpis) |
| return -ENOSPC; |
| |
| *hwirq = dev->event_map.lpi_base + idx; |
| set_bit(idx, dev->event_map.lpi_map); |
| |
| return 0; |
| } |
| |
| static int its_msi_prepare(struct irq_domain *domain, struct device *dev, |
| int nvec, msi_alloc_info_t *info) |
| { |
| struct its_node *its; |
| struct its_device *its_dev; |
| struct msi_domain_info *msi_info; |
| u32 dev_id; |
| |
| /* |
| * We ignore "dev" entierely, and rely on the dev_id that has |
| * been passed via the scratchpad. This limits this domain's |
| * usefulness to upper layers that definitely know that they |
| * are built on top of the ITS. |
| */ |
| dev_id = info->scratchpad[0].ul; |
| |
| msi_info = msi_get_domain_info(domain); |
| its = msi_info->data; |
| |
| its_dev = its_find_device(its, dev_id); |
| if (its_dev) { |
| /* |
| * We already have seen this ID, probably through |
| * another alias (PCI bridge of some sort). No need to |
| * create the device. |
| */ |
| pr_debug("Reusing ITT for devID %x\n", dev_id); |
| goto out; |
| } |
| |
| its_dev = its_create_device(its, dev_id, nvec); |
| if (!its_dev) |
| return -ENOMEM; |
| |
| pr_debug("ITT %d entries, %d bits\n", nvec, ilog2(nvec)); |
| out: |
| info->scratchpad[0].ptr = its_dev; |
| return 0; |
| } |
| |
| static struct msi_domain_ops its_msi_domain_ops = { |
| .msi_prepare = its_msi_prepare, |
| }; |
| |
| static int its_irq_gic_domain_alloc(struct irq_domain *domain, |
| unsigned int virq, |
| irq_hw_number_t hwirq) |
| { |
| struct irq_fwspec fwspec; |
| |
| if (irq_domain_get_of_node(domain->parent)) { |
| fwspec.fwnode = domain->parent->fwnode; |
| fwspec.param_count = 3; |
| fwspec.param[0] = GIC_IRQ_TYPE_LPI; |
| fwspec.param[1] = hwirq; |
| fwspec.param[2] = IRQ_TYPE_EDGE_RISING; |
| } else { |
| return -EINVAL; |
| } |
| |
| return irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec); |
| } |
| |
| static int its_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, |
| unsigned int nr_irqs, void *args) |
| { |
| msi_alloc_info_t *info = args; |
| struct its_device *its_dev = info->scratchpad[0].ptr; |
| irq_hw_number_t hwirq; |
| int err; |
| int i; |
| |
| for (i = 0; i < nr_irqs; i++) { |
| err = its_alloc_device_irq(its_dev, &hwirq); |
| if (err) |
| return err; |
| |
| err = its_irq_gic_domain_alloc(domain, virq + i, hwirq); |
| if (err) |
| return err; |
| |
| irq_domain_set_hwirq_and_chip(domain, virq + i, |
| hwirq, &its_irq_chip, its_dev); |
| pr_debug("ID:%d pID:%d vID:%d\n", |
| (int)(hwirq - its_dev->event_map.lpi_base), |
| (int) hwirq, virq + i); |
| } |
| |
| return 0; |
| } |
| |
| static void its_irq_domain_activate(struct irq_domain *domain, |
| struct irq_data *d) |
| { |
| struct its_device *its_dev = irq_data_get_irq_chip_data(d); |
| u32 event = its_get_event_id(d); |
| |
| /* Bind the LPI to the first possible CPU */ |
| its_dev->event_map.col_map[event] = cpumask_first(cpu_online_mask); |
| |
| /* Map the GIC IRQ and event to the device */ |
| its_send_mapvi(its_dev, d->hwirq, event); |
| } |
| |
| static void its_irq_domain_deactivate(struct irq_domain *domain, |
| struct irq_data *d) |
| { |
| struct its_device *its_dev = irq_data_get_irq_chip_data(d); |
| u32 event = its_get_event_id(d); |
| |
| /* Stop the delivery of interrupts */ |
| its_send_discard(its_dev, event); |
| } |
| |
| static void its_irq_domain_free(struct irq_domain *domain, unsigned int virq, |
| unsigned int nr_irqs) |
| { |
| struct irq_data *d = irq_domain_get_irq_data(domain, virq); |
| struct its_device *its_dev = irq_data_get_irq_chip_data(d); |
| int i; |
| |
| for (i = 0; i < nr_irqs; i++) { |
| struct irq_data *data = irq_domain_get_irq_data(domain, |
| virq + i); |
| u32 event = its_get_event_id(data); |
| |
| /* Mark interrupt index as unused */ |
| clear_bit(event, its_dev->event_map.lpi_map); |
| |
| /* Nuke the entry in the domain */ |
| irq_domain_reset_irq_data(data); |
| } |
| |
| /* If all interrupts have been freed, start mopping the floor */ |
| if (bitmap_empty(its_dev->event_map.lpi_map, |
| its_dev->event_map.nr_lpis)) { |
| its_lpi_free(&its_dev->event_map); |
| |
| /* Unmap device/itt */ |
| its_send_mapd(its_dev, 0); |
| its_free_device(its_dev); |
| } |
| |
| irq_domain_free_irqs_parent(domain, virq, nr_irqs); |
| } |
| |
| static const struct irq_domain_ops its_domain_ops = { |
| .alloc = its_irq_domain_alloc, |
| .free = its_irq_domain_free, |
| .activate = its_irq_domain_activate, |
| .deactivate = its_irq_domain_deactivate, |
| }; |
| |
| static int its_force_quiescent(void __iomem *base) |
| { |
| u32 count = 1000000; /* 1s */ |
| u32 val; |
| |
| val = readl_relaxed(base + GITS_CTLR); |
| if (val & GITS_CTLR_QUIESCENT) |
| return 0; |
| |
| /* Disable the generation of all interrupts to this ITS */ |
| val &= ~GITS_CTLR_ENABLE; |
| writel_relaxed(val, base + GITS_CTLR); |
| |
| /* Poll GITS_CTLR and wait until ITS becomes quiescent */ |
| while (1) { |
| val = readl_relaxed(base + GITS_CTLR); |
| if (val & GITS_CTLR_QUIESCENT) |
| return 0; |
| |
| count--; |
| if (!count) |
| return -EBUSY; |
| |
| cpu_relax(); |
| udelay(1); |
| } |
| } |
| |
| static void __maybe_unused its_enable_quirk_cavium_22375(void *data) |
| { |
| struct its_node *its = data; |
| |
| its->flags |= ITS_FLAGS_WORKAROUND_CAVIUM_22375; |
| } |
| |
| static const struct gic_quirk its_quirks[] = { |
| #ifdef CONFIG_CAVIUM_ERRATUM_22375 |
| { |
| .desc = "ITS: Cavium errata 22375, 24313", |
| .iidr = 0xa100034c, /* ThunderX pass 1.x */ |
| .mask = 0xffff0fff, |
| .init = its_enable_quirk_cavium_22375, |
| }, |
| #endif |
| { |
| } |
| }; |
| |
| static void its_enable_quirks(struct its_node *its) |
| { |
| u32 iidr = readl_relaxed(its->base + GITS_IIDR); |
| |
| gic_enable_quirks(iidr, its_quirks, its); |
| } |
| |
| static int its_probe(struct device_node *node, struct irq_domain *parent) |
| { |
| struct resource res; |
| struct its_node *its; |
| void __iomem *its_base; |
| struct irq_domain *inner_domain; |
| u32 val; |
| u64 baser, tmp; |
| int err; |
| |
| err = of_address_to_resource(node, 0, &res); |
| if (err) { |
| pr_warn("%s: no regs?\n", node->full_name); |
| return -ENXIO; |
| } |
| |
| its_base = ioremap(res.start, resource_size(&res)); |
| if (!its_base) { |
| pr_warn("%s: unable to map registers\n", node->full_name); |
| return -ENOMEM; |
| } |
| |
| val = readl_relaxed(its_base + GITS_PIDR2) & GIC_PIDR2_ARCH_MASK; |
| if (val != 0x30 && val != 0x40) { |
| pr_warn("%s: no ITS detected, giving up\n", node->full_name); |
| err = -ENODEV; |
| goto out_unmap; |
| } |
| |
| err = its_force_quiescent(its_base); |
| if (err) { |
| pr_warn("%s: failed to quiesce, giving up\n", |
| node->full_name); |
| goto out_unmap; |
| } |
| |
| pr_info("ITS: %s\n", node->full_name); |
| |
| its = kzalloc(sizeof(*its), GFP_KERNEL); |
| if (!its) { |
| err = -ENOMEM; |
| goto out_unmap; |
| } |
| |
| raw_spin_lock_init(&its->lock); |
| INIT_LIST_HEAD(&its->entry); |
| INIT_LIST_HEAD(&its->its_device_list); |
| its->base = its_base; |
| its->phys_base = res.start; |
| its->ite_size = ((readl_relaxed(its_base + GITS_TYPER) >> 4) & 0xf) + 1; |
| |
| its->cmd_base = kzalloc(ITS_CMD_QUEUE_SZ, GFP_KERNEL); |
| if (!its->cmd_base) { |
| err = -ENOMEM; |
| goto out_free_its; |
| } |
| its->cmd_write = its->cmd_base; |
| |
| its_enable_quirks(its); |
| |
| err = its_alloc_tables(node->full_name, its); |
| if (err) |
| goto out_free_cmd; |
| |
| err = its_alloc_collections(its); |
| if (err) |
| goto out_free_tables; |
| |
| baser = (virt_to_phys(its->cmd_base) | |
| GITS_CBASER_WaWb | |
| GITS_CBASER_InnerShareable | |
| (ITS_CMD_QUEUE_SZ / SZ_4K - 1) | |
| GITS_CBASER_VALID); |
| |
| writeq_relaxed(baser, its->base + GITS_CBASER); |
| tmp = readq_relaxed(its->base + GITS_CBASER); |
| |
| if ((tmp ^ baser) & GITS_CBASER_SHAREABILITY_MASK) { |
| if (!(tmp & GITS_CBASER_SHAREABILITY_MASK)) { |
| /* |
| * The HW reports non-shareable, we must |
| * remove the cacheability attributes as |
| * well. |
| */ |
| baser &= ~(GITS_CBASER_SHAREABILITY_MASK | |
| GITS_CBASER_CACHEABILITY_MASK); |
| baser |= GITS_CBASER_nC; |
| writeq_relaxed(baser, its->base + GITS_CBASER); |
| } |
| pr_info("ITS: using cache flushing for cmd queue\n"); |
| its->flags |= ITS_FLAGS_CMDQ_NEEDS_FLUSHING; |
| } |
| |
| writeq_relaxed(0, its->base + GITS_CWRITER); |
| writel_relaxed(GITS_CTLR_ENABLE, its->base + GITS_CTLR); |
| |
| if (of_property_read_bool(node, "msi-controller")) { |
| struct msi_domain_info *info; |
| |
| info = kzalloc(sizeof(*info), GFP_KERNEL); |
| if (!info) { |
| err = -ENOMEM; |
| goto out_free_tables; |
| } |
| |
| inner_domain = irq_domain_add_tree(node, &its_domain_ops, its); |
| if (!inner_domain) { |
| err = -ENOMEM; |
| kfree(info); |
| goto out_free_tables; |
| } |
| |
| inner_domain->parent = parent; |
| inner_domain->bus_token = DOMAIN_BUS_NEXUS; |
| info->ops = &its_msi_domain_ops; |
| info->data = its; |
| inner_domain->host_data = info; |
| } |
| |
| spin_lock(&its_lock); |
| list_add(&its->entry, &its_nodes); |
| spin_unlock(&its_lock); |
| |
| return 0; |
| |
| out_free_tables: |
| its_free_tables(its); |
| out_free_cmd: |
| kfree(its->cmd_base); |
| out_free_its: |
| kfree(its); |
| out_unmap: |
| iounmap(its_base); |
| pr_err("ITS: failed probing %s (%d)\n", node->full_name, err); |
| return err; |
| } |
| |
| static bool gic_rdists_supports_plpis(void) |
| { |
| return !!(readl_relaxed(gic_data_rdist_rd_base() + GICR_TYPER) & GICR_TYPER_PLPIS); |
| } |
| |
| int its_cpu_init(void) |
| { |
| if (!list_empty(&its_nodes)) { |
| if (!gic_rdists_supports_plpis()) { |
| pr_info("CPU%d: LPIs not supported\n", smp_processor_id()); |
| return -ENXIO; |
| } |
| its_cpu_init_lpis(); |
| its_cpu_init_collection(); |
| } |
| |
| return 0; |
| } |
| |
| static struct of_device_id its_device_id[] = { |
| { .compatible = "arm,gic-v3-its", }, |
| {}, |
| }; |
| |
| int its_init(struct device_node *node, struct rdists *rdists, |
| struct irq_domain *parent_domain) |
| { |
| struct device_node *np; |
| |
| for (np = of_find_matching_node(node, its_device_id); np; |
| np = of_find_matching_node(np, its_device_id)) { |
| its_probe(np, parent_domain); |
| } |
| |
| if (list_empty(&its_nodes)) { |
| pr_warn("ITS: No ITS available, not enabling LPIs\n"); |
| return -ENXIO; |
| } |
| |
| gic_rdists = rdists; |
| gic_root_node = node; |
| |
| its_alloc_lpi_tables(); |
| its_lpi_init(rdists->id_bits); |
| |
| return 0; |
| } |