hw/block/nvme: support multiple namespaces

This adds support for multiple namespaces by introducing a new 'nvme-ns'
device model. The nvme device creates a bus named from the device name
('id'). The nvme-ns devices then connect to this and registers
themselves with the nvme device.

This changes how an nvme device is created. Example with two namespaces:

  -drive file=nvme0n1.img,if=none,id=disk1
  -drive file=nvme0n2.img,if=none,id=disk2
  -device nvme,serial=deadbeef,id=nvme0
  -device nvme-ns,drive=disk1,bus=nvme0,nsid=1
  -device nvme-ns,drive=disk2,bus=nvme0,nsid=2

The drive property is kept on the nvme device to keep the change
backward compatible, but the property is now optional. Specifying a
drive for the nvme device will always create the namespace with nsid 1.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Minwoo Im <minwoo.im.dev@gmail.com>

1 files changed, 21 insertions, 25 deletions

diff --git a/hw/block/nvme.h b/hw/block/nvme.h
index f355eccb32..d96ec15cdf 100644
--- a/hw/block/nvme.h
+++ b/hw/block/nvme.h
@@ -2,6 +2,9 @@
 #define HW_NVME_H
 
 #include "block/nvme.h"
+#include "nvme-ns.h"
+
+#define NVME_MAX_NAMESPACES 256
 
 typedef struct NvmeParams {
     char     *serial;
@@ -90,26 +93,12 @@ typedef struct NvmeCQueue {
     QTAILQ_HEAD(, NvmeRequest) req_list;
 } NvmeCQueue;
 
-typedef struct NvmeNamespace {
-    NvmeIdNs        id_ns;
-} NvmeNamespace;
-
-static inline NvmeLBAF *nvme_ns_lbaf(NvmeNamespace *ns)
-{
-    NvmeIdNs *id_ns = &ns->id_ns;
-    return &id_ns->lbaf[NVME_ID_NS_FLBAS_INDEX(id_ns->flbas)];
-}
-
-static inline uint8_t nvme_ns_lbads(NvmeNamespace *ns)
-{
-    return nvme_ns_lbaf(ns)->ds;
-}
+#define TYPE_NVME_BUS "nvme-bus"
+#define NVME_BUS(obj) OBJECT_CHECK(NvmeBus, (obj), TYPE_NVME_BUS)
 
-/* convert an LBA to the equivalent in bytes */
-static inline size_t nvme_l2b(NvmeNamespace *ns, uint64_t lba)
-{
-    return lba << nvme_ns_lbads(ns);
-}
+typedef struct NvmeBus {
+    BusState parent_bus;
+} NvmeBus;
 
 #define TYPE_NVME "nvme"
 #define NVME(obj) \
@@ -121,6 +110,7 @@ typedef struct NvmeFeatureVal {
         uint16_t temp_thresh_low;
     };
     uint32_t    async_config;
+    uint32_t    vwc;
 } NvmeFeatureVal;
 
 typedef struct NvmeCtrl {
@@ -128,8 +118,9 @@ typedef struct NvmeCtrl {
     MemoryRegion iomem;
     MemoryRegion ctrl_mem;
     NvmeBar      bar;
-    BlockConf    conf;
     NvmeParams   params;
+    NvmeBus      bus;
+    BlockConf    conf;
 
     bool        qs_created;
     uint32_t    page_size;
@@ -140,7 +131,6 @@ typedef struct NvmeCtrl {
     uint32_t    reg_size;
     uint32_t    num_namespaces;
     uint32_t    max_q_ents;
-    uint64_t    ns_size;
     uint8_t     outstanding_aers;
     uint8_t     *cmbuf;
     uint32_t    irq_status;
@@ -156,7 +146,8 @@ typedef struct NvmeCtrl {
     QTAILQ_HEAD(, NvmeAsyncEvent) aer_queue;
     int         aer_queued;
 
-    NvmeNamespace   *namespaces;
+    NvmeNamespace   namespace;
+    NvmeNamespace   *namespaces[NVME_MAX_NAMESPACES];
     NvmeSQueue      **sq;
     NvmeCQueue      **cq;
     NvmeSQueue      admin_sq;
@@ -165,10 +156,13 @@ typedef struct NvmeCtrl {
     NvmeFeatureVal  features;
 } NvmeCtrl;
 
-/* calculate the number of LBAs that the namespace can accomodate */
-static inline uint64_t nvme_ns_nlbas(NvmeCtrl *n, NvmeNamespace *ns)
+static inline NvmeNamespace *nvme_ns(NvmeCtrl *n, uint32_t nsid)
 {
-    return n->ns_size >> nvme_ns_lbads(ns);
+    if (!nsid || nsid > n->num_namespaces) {
+        return NULL;
+    }
+
+    return n->namespaces[nsid - 1];
 }
 
 static inline NvmeCQueue *nvme_cq(NvmeRequest *req)
@@ -185,4 +179,6 @@ static inline NvmeCtrl *nvme_ctrl(NvmeRequest *req)
     return sq->ctrl;
 }
 
+int nvme_register_namespace(NvmeCtrl *n, NvmeNamespace *ns, Error **errp);
+
 #endif /* HW_NVME_H */