Added functionality to trigger ITS command queue processing on
write to CWRITE register and process each command queue entry to
identify the command type and handle commands like MAPD,MAPC,SYNC.
Signed-off-by: Shashi Mallela <shashi.mall...@linaro.org>
---
hw/intc/arm_gicv3_its.c | 362 ++++++++++++++++++++
1 file changed, 362 insertions(+)
diff --git a/hw/intc/arm_gicv3_its.c b/hw/intc/arm_gicv3_its.c
index 4895d32e67..9b094e1f0a 100644
--- a/hw/intc/arm_gicv3_its.c
+++ b/hw/intc/arm_gicv3_its.c
@@ -56,6 +56,362 @@ struct GICv3ITSClass {
CmdQDesc cq;
};
+static MemTxResult process_sync(GICv3ITSState *s, uint32_t offset)
+{
+ GICv3ITSClass *c = ARM_GICV3_ITS_GET_CLASS(s);
+ AddressSpace *as = &s->gicv3->sysmem_as;
+ uint64_t rdbase;
+ uint64_t value;
+ bool pta = false;
+ MemTxResult res = MEMTX_OK;
+
+ offset += NUM_BYTES_IN_DW;
+ offset += NUM_BYTES_IN_DW;
+
+ value = address_space_ldq_le(as, c->cq.base_addr + offset,
+ MEMTXATTRS_UNSPECIFIED, &res);
+
+ if ((s->typer >> GITS_TYPER_PTA_OFFSET) & GITS_TYPER_PTA_MASK) {
+ /*
+ * only bits[47:16] are considered instead of bits [51:16]
+ * since with a physical address the target address must be
+ * 64KB aligned
+ */
+ rdbase = (value >> RDBASE_OFFSET) & RDBASE_MASK;
+ pta = true;
+ } else {
+ rdbase = (value >> RDBASE_OFFSET) & RDBASE_PROCNUM_MASK;
+ }
+
+ if (!pta && (rdbase < (s->gicv3->num_cpu))) {
+ /*
+ * Current implementation makes a blocking synchronous call
+ * for every command issued earlier,hence the internal state
+ * is already consistent by the time SYNC command is executed.
+ */
+ }
+
+ offset += NUM_BYTES_IN_DW;
+ return res;
+}
+
+static void update_cte(GICv3ITSState *s, uint16_t icid, uint64_t cte)
+{
+ GICv3ITSClass *c = ARM_GICV3_ITS_GET_CLASS(s);
+ AddressSpace *as = &s->gicv3->sysmem_as;
+ uint64_t value;
+ uint8_t page_sz_type;
+ uint64_t l2t_addr;
+ bool valid_l2t;
+ uint32_t l2t_id;
+ uint32_t page_sz = 0;
+ uint32_t max_l2_entries;
+
+ if (c->ct.indirect) {
+ /* 2 level table */
+ page_sz_type = (s->baser[0] >>
+ GITS_BASER_PAGESIZE_OFFSET) &
+ GITS_BASER_PAGESIZE_MASK;
+
+ if (page_sz_type == 0) {
+ page_sz = GITS_ITT_PAGE_SIZE_0;
+ } else if (page_sz_type == 1) {
+ page_sz = GITS_ITT_PAGE_SIZE_1;
+ } else if (page_sz_type == 2) {
+ page_sz = GITS_ITT_PAGE_SIZE_2;
+ }
+
+ l2t_id = icid / (page_sz / L1TABLE_ENTRY_SIZE);
+
+ value = address_space_ldq_le(as,
+ c->ct.base_addr +
+ (l2t_id * L1TABLE_ENTRY_SIZE),
+ MEMTXATTRS_UNSPECIFIED, NULL);
+
+ valid_l2t = (value >> VALID_SHIFT) & VALID_MASK;
+
+ if (valid_l2t) {
+ max_l2_entries = page_sz / c->ct.entry_sz;
+
+ l2t_addr = (value >> page_sz_type) &
+ ((1ULL << (51 - page_sz_type)) - 1);
+
+ address_space_write(as, l2t_addr +
+ ((icid % max_l2_entries) * GITS_CTE_SIZE),
+ MEMTXATTRS_UNSPECIFIED,
+ &cte, sizeof(cte));
+ }
+ } else {
+ /* Flat level table */
+ address_space_write(as, c->ct.base_addr + (icid * GITS_CTE_SIZE),
+ MEMTXATTRS_UNSPECIFIED, &cte,
+ sizeof(cte));
+ }
+}
+
+static MemTxResult process_mapc(GICv3ITSState *s, uint32_t offset)
+{
+ GICv3ITSClass *c = ARM_GICV3_ITS_GET_CLASS(s);
+ AddressSpace *as = &s->gicv3->sysmem_as;
+ uint16_t icid;
+ uint64_t rdbase;
+ bool valid;
+ bool pta = false;
+ MemTxResult res = MEMTX_OK;
+ uint64_t cte_entry;
+ uint64_t value;
+
+ offset += NUM_BYTES_IN_DW;
+ offset += NUM_BYTES_IN_DW;
+
+ value = address_space_ldq_le(as, c->cq.base_addr + offset,
+ MEMTXATTRS_UNSPECIFIED, &res);
+
+ icid = value & ICID_MASK;
+
+ if ((s->typer >> GITS_TYPER_PTA_OFFSET) & GITS_TYPER_PTA_MASK) {
+ /*
+ * only bits[47:16] are considered instead of bits [51:16]
+ * since with a physical address the target address must be
+ * 64KB aligned
+ */
+ rdbase = (value >> RDBASE_OFFSET) & RDBASE_MASK;
+ pta = true;
+ } else {
+ rdbase = (value >> RDBASE_OFFSET) & RDBASE_PROCNUM_MASK;
+ }
+
+ valid = (value >> VALID_SHIFT) & VALID_MASK;
+
+ if (valid) {
+ if ((icid > c->ct.max_collids) || (!pta &&
+ (rdbase > s->gicv3->num_cpu))) {
+ if ((s->typer >> GITS_TYPER_SEIS_OFFSET) &
+ GITS_TYPER_SEIS_MASK) {
+ /* Generate System Error here if supported */
+ }
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: invalid collection table attributes "
+ "icid %d rdbase %lu\n", __func__, icid, rdbase);
+ /*
+ * in this implementation,in case of error
+ * we ignore this command and move onto the next
+ * command in the queue
+ */
+ } else {
+ if (c->ct.valid) {
+ /* add mapping entry to collection table */
+ cte_entry = (valid & VALID_MASK) |
+ (pta ? ((rdbase & RDBASE_MASK) << 1ULL) :
+ ((rdbase & RDBASE_PROCNUM_MASK) << 1ULL));
+
+ update_cte(s, icid, cte_entry);
+ }
+ }
+ } else {
+ if (c->ct.valid) {
+ /* remove mapping entry from collection table */
+ cte_entry = 0;
+
+ update_cte(s, icid, cte_entry);
+ }
+ }
+
+ offset += NUM_BYTES_IN_DW;
+ offset += NUM_BYTES_IN_DW;
+
+ return res;
+}
+
+static void update_dte(GICv3ITSState *s, uint32_t devid, uint64_t dte)
+{
+ GICv3ITSClass *c = ARM_GICV3_ITS_GET_CLASS(s);
+ AddressSpace *as = &s->gicv3->sysmem_as;
+ uint64_t value;
+ uint8_t page_sz_type;
+ uint64_t l2t_addr;
+ bool valid_l2t;
+ uint32_t l2t_id;
+ uint32_t page_sz = 0;
+ uint32_t max_l2_entries;
+
+ if (c->dt.indirect) {
+ /* 2 level table */
+ page_sz_type = (s->baser[0] >>
+ GITS_BASER_PAGESIZE_OFFSET) &
+ GITS_BASER_PAGESIZE_MASK;
+
+ if (page_sz_type == 0) {
+ page_sz = GITS_ITT_PAGE_SIZE_0;
+ } else if (page_sz_type == 1) {
+ page_sz = GITS_ITT_PAGE_SIZE_1;
+ } else if (page_sz_type == 2) {
+ page_sz = GITS_ITT_PAGE_SIZE_2;
+ }
+
+ l2t_id = devid / (page_sz / L1TABLE_ENTRY_SIZE);
+
+ value = address_space_ldq_le(as,
+ c->dt.base_addr +
+ (l2t_id * L1TABLE_ENTRY_SIZE),
+ MEMTXATTRS_UNSPECIFIED, NULL);
+
+ valid_l2t = (value >> VALID_SHIFT) & VALID_MASK;
+
+ if (valid_l2t) {
+ max_l2_entries = page_sz / c->dt.entry_sz;
+
+ l2t_addr = (value >> page_sz_type) &
+ ((1ULL << (51 - page_sz_type)) - 1);
+
+ address_space_write(as, l2t_addr +
+ ((devid % max_l2_entries) * GITS_DTE_SIZE),
+ MEMTXATTRS_UNSPECIFIED, &dte, sizeof(dte));
+ }
+ } else {
+ /* Flat level table */
+ address_space_write(as, c->dt.base_addr + (devid * GITS_DTE_SIZE),
+ MEMTXATTRS_UNSPECIFIED, &dte, sizeof(dte));
+ }
+}
+
+static MemTxResult process_mapd(GICv3ITSState *s, uint64_t value,
+ uint32_t offset)
+{
+ GICv3ITSClass *c = ARM_GICV3_ITS_GET_CLASS(s);
+ AddressSpace *as = &s->gicv3->sysmem_as;
+ uint32_t devid;
+ uint8_t size;
+ uint64_t itt_addr;
+ bool valid;
+ MemTxResult res = MEMTX_OK;
+ uint64_t dte_entry = 0;
+
+ devid = (value >> DEVID_OFFSET) & DEVID_MASK;
+
+ offset += NUM_BYTES_IN_DW;
+ value = address_space_ldq_le(as, c->cq.base_addr + offset,
+ MEMTXATTRS_UNSPECIFIED, &res);
+ size = (value & SIZE_MASK);
+
+ offset += NUM_BYTES_IN_DW;
+ value = address_space_ldq_le(as, c->cq.base_addr + offset,
+ MEMTXATTRS_UNSPECIFIED, &res);
+ itt_addr = (value >> ITTADDR_OFFSET) & ITTADDR_MASK;
+
+ valid = (value >> VALID_SHIFT) & VALID_MASK;
+
+ if (valid) {
+ if ((devid > c->dt.max_devids) ||
+ (size > ((s->typer >> GITS_TYPER_IDBITS_OFFSET) &
+ GITS_TYPER_IDBITS_MASK))) {
+ if ((s->typer >> GITS_TYPER_SEIS_OFFSET) &
+ GITS_TYPER_SEIS_MASK) {
+ /* Generate System Error here if supported */
+ }
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: invalid device table attributes "
+ "devid %d or size %d\n", __func__, devid, size);
+ /*
+ * in this implementation,in case of error
+ * we ignore this command and move onto the next
+ * command in the queue
+ */
+ } else {
+ if (c->dt.valid) {
+ /* add mapping entry to device table */
+ dte_entry = (valid & VALID_MASK) |
+ ((size & SIZE_MASK) << 1U) |
+ ((itt_addr & ITTADDR_MASK) << 6ULL);
+
+ update_dte(s, devid, dte_entry);
+ }
+ }
+ } else {
+ if (c->dt.valid) {
+ /* remove mapping entry from device table */
+ dte_entry = 0;
+ update_dte(s, devid, dte_entry);
+ }
+ }
+
+ offset += NUM_BYTES_IN_DW;
+ offset += NUM_BYTES_IN_DW;
+
+ return res;
+}
+
+/*
+ * Current implementation blocks until all
+ * commands are processed
+ */
+static MemTxResult process_cmdq(GICv3ITSState *s)
+{
+ GICv3ITSClass *c = ARM_GICV3_ITS_GET_CLASS(s);
+ uint32_t wr_offset = 0;
+ uint32_t rd_offset = 0;
+ uint32_t cq_offset = 0;
+ uint64_t data;
+ AddressSpace *as = &s->gicv3->sysmem_as;
+ MemTxResult res = MEMTX_OK;
+ uint8_t cmd;
+
+ wr_offset = (s->cwriter >> GITS_CWRITER_OFFSET) &
+ GITS_CWRITER_OFFSET_MASK;
+
+ if (wr_offset > c->cq.max_entries) {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: invalid write offset "
+ "%d\n", __func__, wr_offset);
+ res = MEMTX_ERROR;
+ return res;
+ }
+
+ rd_offset = (s->creadr >> GITS_CREADR_OFFSET) &
+ GITS_CREADR_OFFSET_MASK;
+
+ while (wr_offset != rd_offset) {
+ cq_offset = (rd_offset * GITS_CMDQ_ENTRY_SIZE);
+ data = address_space_ldq_le(as, c->cq.base_addr + cq_offset,
+ MEMTXATTRS_UNSPECIFIED, &res);
+ cmd = (data & CMD_MASK);
+
+ switch (cmd) {
+ case GITS_CMD_INT:
+ break;
+ case GITS_CMD_CLEAR:
+ break;
+ case GITS_CMD_SYNC:
+ res = process_sync(s, cq_offset);
+ break;
+ case GITS_CMD_MAPD:
+ res = process_mapd(s, data, cq_offset);
+ break;
+ case GITS_CMD_MAPC:
+ res = process_mapc(s, cq_offset);
+ break;
+ case GITS_CMD_MAPTI:
+ break;
+ case GITS_CMD_MAPI:
+ break;
+ case GITS_CMD_DISCARD:
+ break;
+ default:
+ break;
+ }
+ if (res == MEMTX_OK) {
+ rd_offset++;
+ rd_offset %= c->cq.max_entries;
+ s->creadr = (rd_offset << GITS_CREADR_OFFSET);
+ } else {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: %x cmd processing failed!!\n", __func__, cmd);
+ break;
+ }
+ }
+ return res;
+}
+
static bool extract_table_params(GICv3ITSState *s, int index)
{
GICv3ITSClass *c = ARM_GICV3_ITS_GET_CLASS(s);
@@ -325,6 +681,9 @@ static MemTxResult its_writel(GICv3ITSState *s, hwaddr
offset,
break;
case GITS_CWRITER:
s->cwriter = deposit64(s->cwriter, 0, 32, value);
+ if ((s->ctlr & GITS_CTLR_ENABLED) && (s->cwriter != s->creadr)) {
+ result = process_cmdq(s);
+ }
break;
case GITS_CWRITER + 4:
s->cwriter = deposit64(s->cwriter, 32, 32, value);
@@ -459,6 +818,9 @@ static MemTxResult its_writell(GICv3ITSState *s, hwaddr
offset,
break;
case GITS_CWRITER:
s->cwriter = value;
+ if ((s->ctlr & GITS_CTLR_ENABLED) && (s->cwriter != s->creadr)) {
+ result = process_cmdq(s);
+ }
break;
case GITS_TYPER:
case GITS_CREADR:
--
2.27.0
