hw/cxl: mailbox-utils: 0x5602 - FMAPI Set DC Region Config

FM DCD Management command 0x5602 implemented per CXL r3.2 Spec Section 7.6.7.6.3

Reviewed-by: Fan Ni <fan.ni@samsung.com>
Signed-off-by: Anisa Su <anisa.su@samsung.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20250714174509.1984430-8-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 87 insertions, 0 deletions

diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index bf1710b251..b4a0f7d664 100644
--- a/hw/cxl/cxl-mailbox-utils.c
+++ b/hw/cxl/cxl-mailbox-utils.c
@@ -18,6 +18,7 @@
 #include "hw/pci/pci.h"
 #include "hw/pci-bridge/cxl_upstream_port.h"
 #include "qemu/cutils.h"
+#include "qemu/host-utils.h"
 #include "qemu/log.h"
 #include "qemu/units.h"
 #include "qemu/uuid.h"
@@ -121,6 +122,7 @@ enum {
     FMAPI_DCD_MGMT = 0x56,
         #define GET_DCD_INFO    0x0
         #define GET_HOST_DC_REGION_CONFIG   0x1
+        #define SET_DC_REGION_CONFIG        0x2
 };
 
 /* CCI Message Format CXL r3.1 Figure 7-19 */
@@ -3390,6 +3392,84 @@ static CXLRetCode cmd_fm_get_host_dc_region_config(const struct cxl_cmd *cmd,
     return CXL_MBOX_SUCCESS;
 }
 
+/* CXL r3.2 section 7.6.7.6.3: Set Host DC Region Configuration (Opcode 5602) */
+static CXLRetCode cmd_fm_set_dc_region_config(const struct cxl_cmd *cmd,
+                                              uint8_t *payload_in,
+                                              size_t len_in,
+                                              uint8_t *payload_out,
+                                              size_t *len_out,
+                                              CXLCCI *cci)
+{
+    struct {
+        uint8_t reg_id;
+        uint8_t rsvd[3];
+        uint64_t block_sz;
+        uint8_t flags;
+        uint8_t rsvd2[3];
+    } QEMU_PACKED *in = (void *)payload_in;
+    CXLType3Dev *ct3d = CXL_TYPE3(cci->d);
+    CXLEventDynamicCapacity dcEvent = {};
+    CXLDCRegion *region = &ct3d->dc.regions[in->reg_id];
+
+    /*
+     * CXL r3.2 7.6.7.6.3: Set DC Region Configuration
+     * This command shall fail with Unsupported when the Sanitize on Release
+     * field does not match the region’s configuration... and the device
+     * does not support reconfiguration of the Sanitize on Release setting.
+     *
+     * Currently not reconfigurable, so always fail if sanitize bit (bit 0)
+     * doesn't match.
+     */
+    if ((in->flags & 0x1) != (region->flags & 0x1)) {
+        return CXL_MBOX_UNSUPPORTED;
+    }
+
+    if (in->reg_id >= DCD_MAX_NUM_REGION) {
+        return CXL_MBOX_UNSUPPORTED;
+    }
+
+    /* Check that no extents are in the region being reconfigured */
+    if (!bitmap_empty(region->blk_bitmap, region->len / region->block_size)) {
+        return CXL_MBOX_UNSUPPORTED;
+    }
+
+    /* Check that new block size is supported */
+    if (!is_power_of_2(in->block_sz) ||
+        !(in->block_sz & region->supported_blk_size_bitmask)) {
+        return CXL_MBOX_INVALID_INPUT;
+    }
+
+    /* Return success if new block size == current block size */
+    if (in->block_sz == region->block_size) {
+        return CXL_MBOX_SUCCESS;
+    }
+
+    /* Free bitmap and create new one for new block size. */
+    qemu_mutex_lock(&region->bitmap_lock);
+    g_free(region->blk_bitmap);
+    region->blk_bitmap = bitmap_new(region->len / in->block_sz);
+    qemu_mutex_unlock(&region->bitmap_lock);
+    region->block_size = in->block_sz;
+
+    /* Create event record and insert into event log */
+    cxl_assign_event_header(&dcEvent.hdr,
+                            &dynamic_capacity_uuid,
+                            (1 << CXL_EVENT_TYPE_INFO),
+                            sizeof(dcEvent),
+                            cxl_device_get_timestamp(&ct3d->cxl_dstate));
+    dcEvent.type = DC_EVENT_REGION_CONFIG_UPDATED;
+    dcEvent.validity_flags = 1;
+    dcEvent.host_id = 0;
+    dcEvent.updated_region_id = in->reg_id;
+
+    if (cxl_event_insert(&ct3d->cxl_dstate,
+                         CXL_EVENT_TYPE_DYNAMIC_CAP,
+                         (CXLEventRecordRaw *)&dcEvent)) {
+        cxl_event_irq_assert(ct3d);
+    }
+    return CXL_MBOX_SUCCESS;
+}
+
 static const struct cxl_cmd cxl_cmd_set[256][256] = {
     [INFOSTAT][BACKGROUND_OPERATION_ABORT] = { "BACKGROUND_OPERATION_ABORT",
         cmd_infostat_bg_op_abort, 0, 0 },
@@ -3508,6 +3588,13 @@ static const struct cxl_cmd cxl_cmd_set_fm_dcd[256][256] = {
         cmd_fm_get_dcd_info, 0, 0 },
     [FMAPI_DCD_MGMT][GET_HOST_DC_REGION_CONFIG] = { "GET_HOST_DC_REGION_CONFIG",
         cmd_fm_get_host_dc_region_config, 4, 0 },
+    [FMAPI_DCD_MGMT][SET_DC_REGION_CONFIG] = { "SET_DC_REGION_CONFIG",
+        cmd_fm_set_dc_region_config, 16,
+        (CXL_MBOX_CONFIG_CHANGE_COLD_RESET |
+         CXL_MBOX_CONFIG_CHANGE_CONV_RESET |
+         CXL_MBOX_CONFIG_CHANGE_CXL_RESET |
+         CXL_MBOX_IMMEDIATE_CONFIG_CHANGE |
+         CXL_MBOX_IMMEDIATE_DATA_CHANGE) },
 };
 
 /*