blob: 34574f71d1715aaed885cc53c84f2212b05cbe5d [file] [log] [blame]
/*
* Copyright (C) 2020, Red Hat Inc, Eric Auger <eric.auger@redhat.com>
*
* Most of the code is copy-pasted from:
* drivers/irqchip/irq-gic-v3-its.c
* This work is licensed under the terms of the GNU LGPL, version 2.
*/
#include <asm/io.h>
#include <asm/gic.h>
#define ITS_ITT_ALIGN SZ_256
static const char * const its_cmd_string[] = {
[GITS_CMD_MAPD] = "MAPD",
[GITS_CMD_MAPC] = "MAPC",
[GITS_CMD_MAPTI] = "MAPTI",
[GITS_CMD_MAPI] = "MAPI",
[GITS_CMD_MOVI] = "MOVI",
[GITS_CMD_DISCARD] = "DISCARD",
[GITS_CMD_INV] = "INV",
[GITS_CMD_MOVALL] = "MOVALL",
[GITS_CMD_INVALL] = "INVALL",
[GITS_CMD_INT] = "INT",
[GITS_CMD_CLEAR] = "CLEAR",
[GITS_CMD_SYNC] = "SYNC",
};
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;
bool valid;
} its_mapd_cmd;
struct {
struct its_collection *col;
bool valid;
} its_mapc_cmd;
struct {
struct its_device *dev;
u32 phys_id;
u32 event_id;
u32 col_id;
} its_mapti_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_device *dev;
u32 event_id;
} its_clear_cmd;
struct {
struct its_collection *col;
} its_invall_cmd;
struct {
struct its_collection *col;
} its_sync_cmd;
};
bool verbose;
};
typedef void (*its_cmd_builder_t)(struct its_cmd_block *,
struct its_cmd_desc *);
/* ITS COMMANDS */
static void its_mask_encode(u64 *raw_cmd, u64 val, int h, int l)
{
u64 mask = GENMASK_ULL(h, l);
*raw_cmd &= ~mask;
*raw_cmd |= (val << l) & mask;
}
static void its_encode_cmd(struct its_cmd_block *cmd, u8 cmd_nr)
{
its_mask_encode(&cmd->raw_cmd[0], cmd_nr, 7, 0);
}
static void its_encode_devid(struct its_cmd_block *cmd, u32 devid)
{
its_mask_encode(&cmd->raw_cmd[0], devid, 63, 32);
}
static void its_encode_event_id(struct its_cmd_block *cmd, u32 id)
{
its_mask_encode(&cmd->raw_cmd[1], id, 31, 0);
}
static void its_encode_phys_id(struct its_cmd_block *cmd, u32 phys_id)
{
its_mask_encode(&cmd->raw_cmd[1], phys_id, 63, 32);
}
static void its_encode_size(struct its_cmd_block *cmd, u8 size)
{
its_mask_encode(&cmd->raw_cmd[1], size, 4, 0);
}
static void its_encode_itt(struct its_cmd_block *cmd, u64 itt_addr)
{
its_mask_encode(&cmd->raw_cmd[2], itt_addr >> 8, 50, 8);
}
static void its_encode_valid(struct its_cmd_block *cmd, int valid)
{
its_mask_encode(&cmd->raw_cmd[2], !!valid, 63, 63);
}
static void its_encode_target(struct its_cmd_block *cmd, u64 target_addr)
{
its_mask_encode(&cmd->raw_cmd[2], target_addr >> 16, 50, 16);
}
static void its_encode_collection(struct its_cmd_block *cmd, u16 col)
{
its_mask_encode(&cmd->raw_cmd[2], col, 15, 0);
}
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 u64 its_cmd_ptr_to_offset(struct its_cmd_block *ptr)
{
return (ptr - its_data.cmd_base) * sizeof(*ptr);
}
static struct its_cmd_block *its_post_commands(void)
{
u64 wr = its_cmd_ptr_to_offset(its_data.cmd_write);
writeq(wr, its_data.base + GITS_CWRITER);
return its_data.cmd_write;
}
static struct its_cmd_block *its_allocate_entry(void)
{
struct its_cmd_block *cmd;
cmd = its_data.cmd_write++;
if ((u64)its_data.cmd_write == (u64)its_data.cmd_base + SZ_64K)
its_data.cmd_write = its_data.cmd_base;
return cmd;
}
static void its_wait_for_range_completion(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(from);
to_idx = its_cmd_ptr_to_offset(to);
while (1) {
rd_idx = readq(its_data.base + GITS_CREADR);
if (rd_idx >= to_idx || rd_idx < from_idx)
break;
count--;
if (!count) {
unsigned int cmd_id = from->raw_cmd[0] & 0xFF;
assert_msg(false, "%s timeout!",
cmd_id <= 0xF ? its_cmd_string[cmd_id] :
"Unexpected");
}
udelay(1);
}
}
static void its_send_single_command(its_cmd_builder_t builder,
struct its_cmd_desc *desc)
{
struct its_cmd_block *cmd, *next_cmd;
cmd = its_allocate_entry();
builder(cmd, desc);
next_cmd = its_post_commands();
its_wait_for_range_completion(cmd, next_cmd);
}
static void its_build_mapd_cmd(struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
unsigned long itt_addr;
u8 size = desc->its_mapd_cmd.dev->nr_ites;
itt_addr = (unsigned long)(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);
if (desc->verbose)
printf("ITS: MAPD devid=%d size = 0x%x itt=0x%lx valid=%d\n",
desc->its_mapd_cmd.dev->device_id,
size, itt_addr, desc->its_mapd_cmd.valid);
}
static void 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);
if (desc->verbose)
printf("MAPC col_id=%d target_addr = 0x%lx valid=%d\n",
desc->its_mapc_cmd.col->col_id,
desc->its_mapc_cmd.col->target_address,
desc->its_mapc_cmd.valid);
}
static void its_build_mapti_cmd(struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
its_encode_cmd(cmd, GITS_CMD_MAPTI);
its_encode_devid(cmd, desc->its_mapti_cmd.dev->device_id);
its_encode_event_id(cmd, desc->its_mapti_cmd.event_id);
its_encode_phys_id(cmd, desc->its_mapti_cmd.phys_id);
its_encode_collection(cmd, desc->its_mapti_cmd.col_id);
its_fixup_cmd(cmd);
if (desc->verbose)
printf("MAPTI dev_id=%d event_id=%d -> phys_id=%d, col_id=%d\n",
desc->its_mapti_cmd.dev->device_id,
desc->its_mapti_cmd.event_id,
desc->its_mapti_cmd.phys_id,
desc->its_mapti_cmd.col_id);
}
static void 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_invall_cmd.col->col_id);
its_fixup_cmd(cmd);
if (desc->verbose)
printf("INVALL col_id=%d\n", desc->its_invall_cmd.col->col_id);
}
static void its_build_clear_cmd(struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
its_encode_cmd(cmd, GITS_CMD_CLEAR);
its_encode_devid(cmd, desc->its_clear_cmd.dev->device_id);
its_encode_event_id(cmd, desc->its_clear_cmd.event_id);
its_fixup_cmd(cmd);
if (desc->verbose)
printf("CLEAR dev_id=%d event_id=%d\n", desc->its_clear_cmd.dev->device_id, desc->its_clear_cmd.event_id);
}
static void its_build_discard_cmd(struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
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);
if (desc->verbose)
printf("DISCARD dev_id=%d event_id=%d\n",
desc->its_clear_cmd.dev->device_id, desc->its_clear_cmd.event_id);
}
static void its_build_inv_cmd(struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
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);
if (desc->verbose)
printf("INV dev_id=%d event_id=%d\n",
desc->its_inv_cmd.dev->device_id,
desc->its_inv_cmd.event_id);
}
static void its_build_int_cmd(struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
its_encode_cmd(cmd, GITS_CMD_INT);
its_encode_devid(cmd, desc->its_int_cmd.dev->device_id);
its_encode_event_id(cmd, desc->its_int_cmd.event_id);
its_fixup_cmd(cmd);
if (desc->verbose)
printf("INT dev_id=%d event_id=%d\n",
desc->its_int_cmd.dev->device_id,
desc->its_int_cmd.event_id);
}
static void its_build_sync_cmd(struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
its_encode_cmd(cmd, GITS_CMD_SYNC);
its_encode_target(cmd, desc->its_sync_cmd.col->target_address);
its_fixup_cmd(cmd);
if (desc->verbose)
printf("SYNC target_addr = 0x%lx\n",
desc->its_sync_cmd.col->target_address);
}
static void its_build_movi_cmd(struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
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);
if (desc->verbose)
printf("MOVI dev_id=%d event_id = %d col_id=%d\n",
desc->its_movi_cmd.dev->device_id,
desc->its_movi_cmd.event_id,
desc->its_movi_cmd.col->col_id);
}
void __its_send_mapd(struct its_device *dev, int valid, bool verbose)
{
struct its_cmd_desc desc;
desc.its_mapd_cmd.dev = dev;
desc.its_mapd_cmd.valid = !!valid;
desc.verbose = verbose;
its_send_single_command(its_build_mapd_cmd, &desc);
}
void __its_send_mapc(struct its_collection *col, int valid, bool verbose)
{
struct its_cmd_desc desc;
desc.its_mapc_cmd.col = col;
desc.its_mapc_cmd.valid = !!valid;
desc.verbose = verbose;
its_send_single_command(its_build_mapc_cmd, &desc);
}
void __its_send_mapti(struct its_device *dev, u32 irq_id,
u32 event_id, struct its_collection *col, bool verbose)
{
struct its_cmd_desc desc;
desc.its_mapti_cmd.dev = dev;
desc.its_mapti_cmd.phys_id = irq_id;
desc.its_mapti_cmd.event_id = event_id;
desc.its_mapti_cmd.col_id = col->col_id;
desc.verbose = verbose;
its_send_single_command(its_build_mapti_cmd, &desc);
}
void __its_send_int(struct its_device *dev, u32 event_id, bool verbose)
{
struct its_cmd_desc desc;
desc.its_int_cmd.dev = dev;
desc.its_int_cmd.event_id = event_id;
desc.verbose = verbose;
its_send_single_command(its_build_int_cmd, &desc);
}
void __its_send_movi(struct its_device *dev, struct its_collection *col,
u32 id, bool verbose)
{
struct its_cmd_desc desc;
desc.its_movi_cmd.dev = dev;
desc.its_movi_cmd.col = col;
desc.its_movi_cmd.event_id = id;
desc.verbose = verbose;
its_send_single_command(its_build_movi_cmd, &desc);
}
void __its_send_invall(struct its_collection *col, bool verbose)
{
struct its_cmd_desc desc;
desc.its_invall_cmd.col = col;
desc.verbose = verbose;
its_send_single_command(its_build_invall_cmd, &desc);
}
void __its_send_inv(struct its_device *dev, u32 event_id, bool verbose)
{
struct its_cmd_desc desc;
desc.its_inv_cmd.dev = dev;
desc.its_inv_cmd.event_id = event_id;
desc.verbose = verbose;
its_send_single_command(its_build_inv_cmd, &desc);
}
void __its_send_discard(struct its_device *dev, u32 event_id, bool verbose)
{
struct its_cmd_desc desc;
desc.its_discard_cmd.dev = dev;
desc.its_discard_cmd.event_id = event_id;
desc.verbose = verbose;
its_send_single_command(its_build_discard_cmd, &desc);
}
void __its_send_clear(struct its_device *dev, u32 event_id, bool verbose)
{
struct its_cmd_desc desc;
desc.its_clear_cmd.dev = dev;
desc.its_clear_cmd.event_id = event_id;
desc.verbose = verbose;
its_send_single_command(its_build_clear_cmd, &desc);
}
void __its_send_sync(struct its_collection *col, bool verbose)
{
struct its_cmd_desc desc;
desc.its_sync_cmd.col = col;
desc.verbose = verbose;
its_send_single_command(its_build_sync_cmd, &desc);
}