Re: [PATCH v2 11/18] hw/block/nvme: add remaining mandatory controller parameters

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 7/3/20 10:46 AM, Klaus Jensen wrote:
> On Jul  3 10:31, Philippe Mathieu-Daudé wrote:
>> On 7/3/20 8:34 AM, Klaus Jensen wrote:
>>> From: Klaus Jensen <k.jensen@samsung.com>
>>>
>>> Add support for any remaining mandatory controller operating parameters
>>> (features).
>>>
>>> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
>>> Reviewed-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
>>> ---
>>>  hw/block/nvme.c       | 39 +++++++++++++++++++++++++++++++++------
>>>  hw/block/nvme.h       | 18 ++++++++++++++++++
>>>  hw/block/trace-events |  2 ++
>>>  include/block/nvme.h  |  7 +++++++
>>>  4 files changed, 60 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/hw/block/nvme.c b/hw/block/nvme.c
>>> index ba523f6768bf..affb9a967534 100644
>>> --- a/hw/block/nvme.c
>>> +++ b/hw/block/nvme.c
>>> @@ -1056,8 +1056,16 @@ static uint16_t nvme_get_feature(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *req)
>>>      uint32_t dw10 = le32_to_cpu(cmd->cdw10);
>>>      uint32_t dw11 = le32_to_cpu(cmd->cdw11);
>>>      uint32_t result;
>>> +    uint8_t fid = NVME_GETSETFEAT_FID(dw10);
>>> +    uint16_t iv;
>>>  
>>> -    switch (dw10) {
>>> +    trace_pci_nvme_getfeat(nvme_cid(req), fid, dw11);
>>> +
>>> +    if (!nvme_feature_support[fid]) {
>>> +        return NVME_INVALID_FIELD | NVME_DNR;
>>> +    }
>>> +
>>> +    switch (fid) {
>>>      case NVME_TEMPERATURE_THRESHOLD:
>>>          result = 0;
>>>  
>>> @@ -1088,14 +1096,27 @@ static uint16_t nvme_get_feature(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *req)
>>>                               ((n->params.max_ioqpairs - 1) << 16));
>>>          trace_pci_nvme_getfeat_numq(result);
>>>          break;
>>> +    case NVME_INTERRUPT_VECTOR_CONF:
>>> +        iv = dw11 & 0xffff;
>>> +        if (iv >= n->params.max_ioqpairs + 1) {
>>> +            return NVME_INVALID_FIELD | NVME_DNR;
>>> +        }
>>> +
>>> +        result = iv;
>>> +        if (iv == n->admin_cq.vector) {
>>> +            result |= NVME_INTVC_NOCOALESCING;
>>> +        }
>>> +
>>> +        result = cpu_to_le32(result);
>>> +        break;
>>>      case NVME_ASYNCHRONOUS_EVENT_CONF:
>>>          result = cpu_to_le32(n->features.async_config);
>>>          break;
>>>      case NVME_TIMESTAMP:
>>>          return nvme_get_feature_timestamp(n, cmd);
>>>      default:
>>> -        trace_pci_nvme_err_invalid_getfeat(dw10);
>>> -        return NVME_INVALID_FIELD | NVME_DNR;
>>> +        result = cpu_to_le32(nvme_feature_default[fid]);
>>
>> So here we expect uninitialized fid entries to return 0, right?
>>
> 
> Yes, if defaults are not 0 (like NVME_ARBITRATION), it is explicitly set.
> 
>>> +        break;
>>>      }
>>>  
>>>      req->cqe.result = result;
>>> @@ -1124,8 +1145,15 @@ static uint16_t nvme_set_feature(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *req)
>>>  {
>>>      uint32_t dw10 = le32_to_cpu(cmd->cdw10);
>>>      uint32_t dw11 = le32_to_cpu(cmd->cdw11);
>>> +    uint8_t fid = NVME_GETSETFEAT_FID(dw10);
>>>  
>>> -    switch (dw10) {
>>> +    trace_pci_nvme_setfeat(nvme_cid(req), fid, dw11);
>>> +
>>> +    if (!nvme_feature_support[fid]) {
>>> +        return NVME_INVALID_FIELD | NVME_DNR;
>>> +    }
>>> +
>>> +    switch (fid) {
>>>      case NVME_TEMPERATURE_THRESHOLD:
>>>          if (NVME_TEMP_TMPSEL(dw11) != NVME_TEMP_TMPSEL_COMPOSITE) {
>>>              break;
>>> @@ -1172,8 +1200,7 @@ static uint16_t nvme_set_feature(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *req)
>>>      case NVME_TIMESTAMP:
>>>          return nvme_set_feature_timestamp(n, cmd);
>>>      default:
>>> -        trace_pci_nvme_err_invalid_setfeat(dw10);
>>> -        return NVME_INVALID_FIELD | NVME_DNR;
>>> +        return NVME_FEAT_NOT_CHANGEABLE | NVME_DNR;
>>>      }
>>>      return NVME_SUCCESS;
>>>  }
>>> diff --git a/hw/block/nvme.h b/hw/block/nvme.h
>>> index f8940435f9ef..8ad1e3c89cee 100644
>>> --- a/hw/block/nvme.h
>>> +++ b/hw/block/nvme.h
>>> @@ -87,6 +87,24 @@ typedef struct NvmeFeatureVal {
>>>      uint32_t    async_config;
>>>  } NvmeFeatureVal;

What do you think about adding:

--- a/include/block/nvme.h
+++ b/include/block/nvme.h
@@ -804,7 +804,8 @@ enum NvmeFeatureIds {
     NVME_WRITE_ATOMICITY            = 0xa,
     NVME_ASYNCHRONOUS_EVENT_CONF    = 0xb,
     NVME_TIMESTAMP                  = 0xe,
-    NVME_SOFTWARE_PROGRESS_MARKER   = 0x80
+    NVME_SOFTWARE_PROGRESS_MARKER   = 0x80,
+    NVME_FEATURE_ID_COUNT           = 0x100
 };

>>>  
>>> +static const uint32_t nvme_feature_default[0x100] = {

Why uint32_t and not uint16_t?

With the previously suggested enum you can now replace 0x100
by NVME_FEATURE_ID_COUNT.

>>> +    [NVME_ARBITRATION]           = NVME_ARB_AB_NOLIMIT,
>>> +};
>>> +
>>> +static const bool nvme_feature_support[0x100] = {

Ditto NVME_FEATURE_ID_COUNT.

>>> +    [NVME_ARBITRATION]              = true,
>>> +    [NVME_POWER_MANAGEMENT]         = true,
>>> +    [NVME_TEMPERATURE_THRESHOLD]    = true,
>>> +    [NVME_ERROR_RECOVERY]           = true,
>>> +    [NVME_VOLATILE_WRITE_CACHE]     = true,
>>> +    [NVME_NUMBER_OF_QUEUES]         = true,
>>> +    [NVME_INTERRUPT_COALESCING]     = true,
>>> +    [NVME_INTERRUPT_VECTOR_CONF]    = true,
>>> +    [NVME_WRITE_ATOMICITY]          = true,
>>> +    [NVME_ASYNCHRONOUS_EVENT_CONF]  = true,
>>> +    [NVME_TIMESTAMP]                = true,
>>> +};
>>
>> Nack. No variable assignation in header please.

Rationale is if another C source file include this header,
the array will be redeclared (statically) and eventually
unused.

>> Move that to the source file.
>>
> 
> Understood :)
> 
>>> +
>>>  typedef struct NvmeCtrl {
>>>      PCIDevice    parent_obj;
>>>      MemoryRegion iomem;
>>> diff --git a/hw/block/trace-events b/hw/block/trace-events
>>> index 091af16ca7d7..42e62f4649f8 100644
>>> --- a/hw/block/trace-events
>>> +++ b/hw/block/trace-events
>>> @@ -46,6 +46,8 @@ pci_nvme_identify_ctrl(void) "identify controller"
>>>  pci_nvme_identify_ns(uint32_t ns) "nsid %"PRIu32""
>>>  pci_nvme_identify_nslist(uint32_t ns) "nsid %"PRIu32""
>>>  pci_nvme_get_log(uint16_t cid, uint8_t lid, uint8_t lsp, uint8_t rae, uint32_t len, uint64_t off) "cid %"PRIu16" lid 0x%"PRIx8" lsp 0x%"PRIx8" rae 0x%"PRIx8" len %"PRIu32" off %"PRIu64""
>>> +pci_nvme_getfeat(uint16_t cid, uint8_t fid, uint32_t cdw11) "cid %"PRIu16" fid 0x%"PRIx8" cdw11 0x%"PRIx32""
>>> +pci_nvme_setfeat(uint16_t cid, uint8_t fid, uint32_t cdw11) "cid %"PRIu16" fid 0x%"PRIx8" cdw11 0x%"PRIx32""
>>>  pci_nvme_getfeat_vwcache(const char* result) "get feature volatile write cache, result=%s"
>>>  pci_nvme_getfeat_numq(int result) "get feature number of queues, result=%d"
>>>  pci_nvme_setfeat_numq(int reqcq, int reqsq, int gotcq, int gotsq) "requested cq_count=%d sq_count=%d, responding with cq_count=%d sq_count=%d"
>>> diff --git a/include/block/nvme.h b/include/block/nvme.h
>>> index 0dce15af6bcf..406648d4cf94 100644
>>> --- a/include/block/nvme.h
>>> +++ b/include/block/nvme.h
>>> @@ -662,6 +662,7 @@ enum NvmeStatusCodes {
>>>      NVME_FW_REQ_RESET           = 0x010b,
>>>      NVME_INVALID_QUEUE_DEL      = 0x010c,
>>>      NVME_FID_NOT_SAVEABLE       = 0x010d,
>>> +    NVME_FEAT_NOT_CHANGEABLE    = 0x010e,
>>>      NVME_FID_NOT_NSID_SPEC      = 0x010f,
>>>      NVME_FW_REQ_SUSYSTEM_RESET  = 0x0110,
>>>      NVME_CONFLICTING_ATTRS      = 0x0180,
>>> @@ -866,6 +867,7 @@ enum NvmeIdCtrlLpa {
>>>  #define NVME_CTRL_SGLS_ADDR_OFFSET         (0x1 << 20)
>>>  
>>>  #define NVME_ARB_AB(arb)    (arb & 0x7)
>>> +#define NVME_ARB_AB_NOLIMIT 0x7
>>>  #define NVME_ARB_LPW(arb)   ((arb >> 8) & 0xff)
>>>  #define NVME_ARB_MPW(arb)   ((arb >> 16) & 0xff)
>>>  #define NVME_ARB_HPW(arb)   ((arb >> 24) & 0xff)
>>> @@ -873,6 +875,8 @@ enum NvmeIdCtrlLpa {
>>>  #define NVME_INTC_THR(intc)     (intc & 0xff)
>>>  #define NVME_INTC_TIME(intc)    ((intc >> 8) & 0xff)
>>>  
>>> +#define NVME_INTVC_NOCOALESCING (0x1 << 16)
>>> +
>>>  #define NVME_TEMP_THSEL(temp)  ((temp >> 20) & 0x3)
>>>  #define NVME_TEMP_THSEL_OVER   0x0
>>>  #define NVME_TEMP_THSEL_UNDER  0x1
>>> @@ -902,6 +906,9 @@ enum NvmeFeatureIds {
>>>      NVME_SOFTWARE_PROGRESS_MARKER   = 0x80
>>>  };
>>>  
>>> +#define NVME_GETSETFEAT_FID_MASK 0xff
>>> +#define NVME_GETSETFEAT_FID(dw10) (dw10 & NVME_GETSETFEAT_FID_MASK)
>>> +
>>>  typedef struct NvmeRangeType {
>>>      uint8_t     type;
>>>      uint8_t     attributes;
>>>
>>
>