@@ -65,6 +65,7 @@ enum {
MEDIA_AND_POISON = 0x43,
#define GET_POISON_LIST 0x0
#define INJECT_POISON 0x1
+ #define CLEAR_POISON 0x2
};
/* 8.2.8.4.5.1 Command Return Codes */
@@ -512,6 +513,85 @@ static CXLRetCode cmd_media_inject_poison(struct cxl_cmd *cmd,
return CXL_MBOX_SUCCESS;
}
+static CXLRetCode cmd_media_clear_poison(struct cxl_cmd *cmd,
+ CXLDeviceState *cxl_dstate,
+ uint16_t *len_unused)
+{
+ CXLType3Dev *ct3d = container_of(cxl_dstate, CXLType3Dev, cxl_dstate);
+ CXLPoisonList *poison_list = &ct3d->poison_list;
+ CXLType3Class *cvc = CXL_TYPE3_GET_CLASS(ct3d);
+ struct clear_poison_pl {
+ uint64_t dpa;
+ uint8_t data[64];
+ };
+ CXLPoison *ent;
+ uint64_t dpa;
+
+ struct clear_poison_pl *in = (void *)cmd->payload;
+
+ dpa = ldq_le_p(&in->dpa);
+ if (dpa + CXL_CACHE_LINE_SIZE > cxl_dstate->mem_size) {
+ return CXL_MBOX_INVALID_PA;
+ }
+
+ /* Clearing a region with no poison is not an error so always do so */
+ if (cvc->set_cacheline) {
+ if (!cvc->set_cacheline(ct3d, dpa, in->data)) {
+ return CXL_MBOX_INTERNAL_ERROR;
+ }
+ }
+
+ QLIST_FOREACH(ent, poison_list, node) {
+ /*
+ * Test for contained in entry. Simpler than general case
+ * as clearing 64 bytes and entries 64 byte aligned
+ */
+ if ((dpa >= ent->start) && (dpa < ent->start + ent->length)) {
+ break;
+ }
+ }
+ if (!ent) {
+ return CXL_MBOX_SUCCESS;
+ }
+
+ QLIST_REMOVE(ent, node);
+ ct3d->poison_list_cnt--;
+
+ if (dpa > ent->start) {
+ CXLPoison *frag;
+ /* Cannot overflow as replacing existing entry */
+
+ frag = g_new0(CXLPoison, 1);
+
+ frag->start = ent->start;
+ frag->length = dpa - ent->start;
+ frag->type = ent->type;
+
+ QLIST_INSERT_HEAD(poison_list, frag, node);
+ ct3d->poison_list_cnt++;
+ }
+
+ if (dpa + CXL_CACHE_LINE_SIZE < ent->start + ent->length) {
+ CXLPoison *frag;
+
+ if (ct3d->poison_list_cnt == CXL_POISON_LIST_LIMIT) {
+ cxl_set_poison_list_overflowed(ct3d);
+ } else {
+ frag = g_new0(CXLPoison, 1);
+
+ frag->start = dpa + CXL_CACHE_LINE_SIZE;
+ frag->length = ent->start + ent->length - frag->start;
+ frag->type = ent->type;
+ QLIST_INSERT_HEAD(poison_list, frag, node);
+ ct3d->poison_list_cnt++;
+ }
+ }
+ /* Any fragments have been added, free original entry */
+ g_free(ent);
+
+ return CXL_MBOX_SUCCESS;
+}
+
#define IMMEDIATE_CONFIG_CHANGE (1 << 1)
#define IMMEDIATE_DATA_CHANGE (1 << 2)
#define IMMEDIATE_POLICY_CHANGE (1 << 3)
@@ -543,6 +623,8 @@ static struct cxl_cmd cxl_cmd_set[256][256] = {
cmd_media_get_poison_list, 16, 0 },
[MEDIA_AND_POISON][INJECT_POISON] = { "MEDIA_AND_POISON_INJECT_POISON",
cmd_media_inject_poison, 8, 0 },
+ [MEDIA_AND_POISON][CLEAR_POISON] = { "MEDIA_AND_POISON_CLEAR_POISON",
+ cmd_media_clear_poison, 72, 0 },
};
void cxl_process_mailbox(CXLDeviceState *cxl_dstate)
@@ -947,6 +947,42 @@ static void set_lsa(CXLType3Dev *ct3d, const void *buf, uint64_t size,
*/
}
+static bool set_cacheline(CXLType3Dev *ct3d, uint64_t dpa_offset, uint8_t *data)
+{
+ MemoryRegion *vmr = NULL, *pmr = NULL;
+ AddressSpace *as;
+
+ if (ct3d->hostvmem) {
+ vmr = host_memory_backend_get_memory(ct3d->hostvmem);
+ }
+ if (ct3d->hostpmem) {
+ pmr = host_memory_backend_get_memory(ct3d->hostpmem);
+ }
+
+ if (!vmr && !pmr) {
+ return false;
+ }
+
+ if (dpa_offset + 64 > ct3d->cxl_dstate.mem_size) {
+ return false;
+ }
+
+ if (vmr) {
+ if (dpa_offset < memory_region_size(vmr)) {
+ as = &ct3d->hostvmem_as;
+ } else {
+ as = &ct3d->hostpmem_as;
+ dpa_offset -= memory_region_size(vmr);
+ }
+ } else {
+ as = &ct3d->hostpmem_as;
+ }
+
+ address_space_write(as, dpa_offset, MEMTXATTRS_UNSPECIFIED, &data,
+ CXL_CACHE_LINE_SIZE);
+ return true;
+}
+
void cxl_set_poison_list_overflowed(CXLType3Dev *ct3d)
{
ct3d->poison_list_overflowed = true;
@@ -1168,6 +1204,7 @@ static void ct3_class_init(ObjectClass *oc, void *data)
cvc->get_lsa_size = get_lsa_size;
cvc->get_lsa = get_lsa;
cvc->set_lsa = set_lsa;
+ cvc->set_cacheline = set_cacheline;
}
static const TypeInfo ct3d_info = {
@@ -298,6 +298,7 @@ struct CXLType3Class {
uint64_t offset);
void (*set_lsa)(CXLType3Dev *ct3d, const void *buf, uint64_t size,
uint64_t offset);
+ bool (*set_cacheline)(CXLType3Dev *ct3d, uint64_t dpa_offset, uint8_t *data);
};
MemTxResult cxl_type3_read(PCIDevice *d, hwaddr host_addr, uint64_t *data,