Implement main ITS commands. The code is largely inherited from
the ITS driver.
Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
v2 -> v3:
- do not use report() anymore
- assert if cmd_write exceeds the queue capacity
v1 -> v2:
- removed its_print_cmd_state
---
arm/Makefile.arm64 | 2 +-
lib/arm/asm/gic-v3-its.h | 38 +++-
lib/arm/gic-v3-its-cmd.c | 454 +++++++++++++++++++++++++++++++++++++++
3 files changed, 492 insertions(+), 2 deletions(-)
create mode 100644 lib/arm/gic-v3-its-cmd.c
diff --git a/arm/Makefile.arm64 b/arm/Makefile.arm64
index 2571ffb..d12aea5 100644
--- a/arm/Makefile.arm64
+++ b/arm/Makefile.arm64
@@ -19,7 +19,7 @@ endef
cstart.o = $(TEST_DIR)/cstart64.o
cflatobjs += lib/arm64/processor.o
cflatobjs += lib/arm64/spinlock.o
-cflatobjs += lib/arm/gic-v3-its.o
+cflatobjs += lib/arm/gic-v3-its.o lib/arm/gic-v3-its-cmd.o
OBJDIRS += lib/arm64
diff --git a/lib/arm/asm/gic-v3-its.h b/lib/arm/asm/gic-v3-its.h
index acd97a9..0e5c5b6 100644
--- a/lib/arm/asm/gic-v3-its.h
+++ b/lib/arm/asm/gic-v3-its.h
@@ -45,6 +45,8 @@ struct its_collection {
u16 col_id;
};
+struct its_cmd_block;
+
struct its_data {
void *base;
struct its_typer typer;
@@ -107,6 +109,24 @@ extern struct its_data its_data;
#define GITS_BASER_TYPE_DEVICE 1
#define GITS_BASER_TYPE_COLLECTION 4
+/*
+ * ITS commands
+ */
+#define GITS_CMD_MAPD 0x08
+#define GITS_CMD_MAPC 0x09
+#define GITS_CMD_MAPTI 0x0a
+/* older GIC documentation used MAPVI for this command */
+#define GITS_CMD_MAPVI GITS_CMD_MAPTI
+#define GITS_CMD_MAPI 0x0b
+#define GITS_CMD_MOVI 0x01
+#define GITS_CMD_DISCARD 0x0f
+#define GITS_CMD_INV 0x0c
+#define GITS_CMD_MOVALL 0x0e
+#define GITS_CMD_INVALL 0x0d
+#define GITS_CMD_INT 0x03
+#define GITS_CMD_CLEAR 0x04
+#define GITS_CMD_SYNC 0x05
+
struct its_cmd_block {
u64 raw_cmd[4];
};
@@ -119,11 +139,27 @@ extern void its_enable_defaults(void);
extern struct its_device *its_create_device(u32 dev_id, int nr_ites);
extern struct its_collection *its_create_collection(u32 col_id, u32 target_pe);
+extern void its_send_mapd(struct its_device *dev, int valid);
+extern void its_send_mapc(struct its_collection *col, int valid);
+extern void its_send_mapti(struct its_device *dev, u32 irq_id,
+ u32 event_id, struct its_collection *col);
+extern void its_send_int(struct its_device *dev, u32 event_id);
+extern void its_send_inv(struct its_device *dev, u32 event_id);
+extern void its_send_discard(struct its_device *dev, u32 event_id);
+extern void its_send_clear(struct its_device *dev, u32 event_id);
+extern void its_send_invall(struct its_collection *col);
+extern void its_send_movi(struct its_device *dev,
+ struct its_collection *col, u32 id);
+extern void its_send_sync(struct its_collection *col);
+
+#define ITS_FLAGS_CMDQ_NEEDS_FLUSHING (1ULL << 0)
+#define ITS_FLAGS_WORKAROUND_CAVIUM_22375 (1ULL << 1)
+#define ITS_FLAGS_WORKAROUND_CAVIUM_23144 (1ULL << 2)
+
#else /* __arm__ */
static inline void its_init(void) {}
#endif
-
#endif /* !__ASSEMBLY__ */
#endif /* _ASMARM_GIC_V3_ITS_H_ */
diff --git a/lib/arm/gic-v3-its-cmd.c b/lib/arm/gic-v3-its-cmd.c
new file mode 100644
index 0000000..fb4364c
--- /dev/null
+++ b/lib/arm/gic-v3-its-cmd.c
@@ -0,0 +1,454 @@
+/*
+ * Copyright (C) 2020, Red Hat Inc, Eric Auger <eric.auger@xxxxxxxxxx>
+ *
+ * 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>
+#include <asm/gic-v3-its.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;
+ };
+};
+
+typedef void (*its_cmd_builder_t)(struct its_cmd_block *,
+ struct its_cmd_desc *);
+
+/* ITS COMMANDS */
+
+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] &= ~(0xfffffffffUL << 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 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;
+
+ assert((u64)its_data.cmd_write < (u64)its_data.cmd_base + SZ_64K);
+ cmd = its_data.cmd_write++;
+ 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");
+ return;
+ }
+ cpu_relax();
+ 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 = 12; /* 4096 eventids */
+
+ itt_addr = (unsigned long)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);
+ 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);
+ report_info("MAPC col_id=%d target_addr = 0x%lx valid=%d",
+ 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);
+ report_info("MAPTI dev_id=%d event_id=%d -> phys_id=%d, col_id=%d",
+ 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);
+ report_info("INVALL col_id=%d", 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);
+ report_info("CLEAR col_id=%d", desc->its_invall_cmd.col->col_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);
+ report_info("DISCARD col_id=%d", desc->its_invall_cmd.col->col_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);
+ report_info("INV dev_id=%d event_id=%d",
+ 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);
+ report_info("INT dev_id=%d event_id=%d",
+ 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);
+ report_info("SYNC target_addr = 0x%lx",
+ 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);
+ report_info("MOVI dev_id=%d event_id = %d col_id=%d",
+ 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)
+{
+ struct its_cmd_desc desc;
+
+ desc.its_mapd_cmd.dev = dev;
+ desc.its_mapd_cmd.valid = !!valid;
+
+ its_send_single_command(its_build_mapd_cmd, &desc);
+}
+
+void its_send_mapc(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_build_mapc_cmd, &desc);
+}
+
+void its_send_mapti(struct its_device *dev, u32 irq_id,
+ u32 event_id, struct its_collection *col)
+{
+ 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;
+
+ its_send_single_command(its_build_mapti_cmd, &desc);
+}
+
+void its_send_int(struct its_device *dev, u32 event_id)
+{
+ struct its_cmd_desc desc;
+
+ desc.its_int_cmd.dev = dev;
+ desc.its_int_cmd.event_id = event_id;
+
+ its_send_single_command(its_build_int_cmd, &desc);
+}
+
+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(its_build_movi_cmd, &desc);
+}
+
+void its_send_invall(struct its_collection *col)
+{
+ struct its_cmd_desc desc;
+
+ desc.its_invall_cmd.col = col;
+
+ its_send_single_command(its_build_invall_cmd, &desc);
+}
+
+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(its_build_inv_cmd, &desc);
+}
+
+void its_send_discard(struct its_device *dev, u32 event_id)
+{
+ struct its_cmd_desc desc;
+
+ desc.its_discard_cmd.dev = dev;
+ desc.its_discard_cmd.event_id = event_id;
+
+ its_send_single_command(its_build_discard_cmd, &desc);
+}
+
+void its_send_clear(struct its_device *dev, u32 event_id)
+{
+ struct its_cmd_desc desc;
+
+ desc.its_clear_cmd.dev = dev;
+ desc.its_clear_cmd.event_id = event_id;
+
+ its_send_single_command(its_build_clear_cmd, &desc);
+}
+
+void its_send_sync(struct its_collection *col)
+{
+ struct its_cmd_desc desc;
+
+ desc.its_sync_cmd.col = col;
+
+ its_send_single_command(its_build_sync_cmd, &desc);
+}
+
--
2.20.1
