Re: [Qemu-devel] [PATCH v3 10/10] ipmi: provide support for FRUs

[Cédric Le Goater]

On 03/15/2016 03:30 PM, Michael S. Tsirkin wrote:
> On Thu, Mar 10, 2016 at 03:04:03PM +0100, Cédric Le Goater wrote:
>> This patch provides a simple FRU support for the BMC simulator. FRUs
>> are loaded from a file which name is specified in the object
>> properties, each entry having a fixed size, also specified in the
>> properties. If the file is unknown or not accessible for some reason,
>> a unique entry of 1024 bytes is created as a default. Just enough to
>> start some simulation.
>>
>> These commands complies with the IPMI spec : "34. FRU Inventory Device
>> Commands".
>>
>> Signed-off-by: Cédric Le Goater <address@hidden>
>> Acked-by: Corey Minyard <address@hidden>
> 
> Since pull failed, I decided to hold this off until after release.
> Loading new files needs some thought.

OK. See below for the build break.

>> ---
>>
>> Changes since v2:
>>
>>  - changed 'struct rsp_buffer' to 'RspBuffer'
>>  
>> Changes since v1:
>>
>>  - change property name to 'fruareasize' and 'frudatafile'
>>  - add documentation of new properties
>>  
>>  hw/ipmi/ipmi_bmc_sim.c |  131 
>> +++++++++++++++++++++++++++++++++++++++++++++++++
>>  qemu-options.hx        |    8 ++
>>  2 files changed, 137 insertions(+), 2 deletions(-)
>>
>> Index: qemu-powernv.git/hw/ipmi/ipmi_bmc_sim.c
>> ===================================================================
>> --- qemu-powernv.git.orig/hw/ipmi/ipmi_bmc_sim.c
>> +++ qemu-powernv.git/hw/ipmi/ipmi_bmc_sim.c
>> @@ -80,6 +80,9 @@
>>  #define IPMI_CMD_ENTER_SDR_REP_UPD_MODE   0x2A
>>  #define IPMI_CMD_EXIT_SDR_REP_UPD_MODE    0x2B
>>  #define IPMI_CMD_RUN_INIT_AGENT           0x2C
>> +#define IPMI_CMD_GET_FRU_AREA_INFO        0x10
>> +#define IPMI_CMD_READ_FRU_DATA            0x11
>> +#define IPMI_CMD_WRITE_FRU_DATA           0x12
>>  #define IPMI_CMD_GET_SEL_INFO             0x40
>>  #define IPMI_CMD_GET_SEL_ALLOC_INFO       0x41
>>  #define IPMI_CMD_RESERVE_SEL              0x42
>> @@ -122,6 +125,13 @@ typedef struct IPMISdr {
>>      uint8_t overflow;
>>  } IPMISdr;
>>  
>> +typedef struct IPMIFru {
>> +    char *filename;
>> +    unsigned int nentries;
>> +    uint16_t areasize;
>> +    uint8_t *data;
>> +} IPMIFru;
>> +
>>  typedef struct IPMISensor {
>>      uint8_t status;
>>      uint8_t reading;
>> @@ -213,6 +223,7 @@ struct IPMIBmcSim {
>>  
>>      IPMISel sel;
>>      IPMISdr sdr;
>> +    IPMIFru fru;
>>      IPMISensor sensors[MAX_SENSORS];
>>      char *sdr_filename;
>>  
>> @@ -1322,6 +1333,94 @@ static void get_sel_info(IPMIBmcSim *ibs
>>      rsp_buffer_push(rsp, (ibs->sel.overflow << 7) | 0x02);
>>  }
>>  
>> +static void get_fru_area_info(IPMIBmcSim *ibs,
>> +                         uint8_t *cmd, unsigned int cmd_len,
>> +                         RspBuffer *rsp)
>> +{
>> +    uint8_t fruid;
>> +    uint16_t fru_entry_size;
>> +
>> +    fruid = cmd[2];
>> +
>> +    if (fruid >= ibs->fru.nentries) {
>> +        rsp_buffer_set_error(rsp, IPMI_CC_INVALID_DATA_FIELD);
>> +        return;
>> +    }
>> +
>> +    fru_entry_size = ibs->fru.areasize;
>> +
>> +    rsp_buffer_push(rsp, fru_entry_size & 0xff);
>> +    rsp_buffer_push(rsp, fru_entry_size >> 8 & 0xff);
>> +    rsp_buffer_push(rsp, 0x0);
>> +}
>> +
>> +#define min(x, y) ((x) < (y) ? (x) : (y))
>> +#define max(x, y) ((x) > (y) ? (x) : (y))


Do you want a resend to fix these ^ and use the MIN and MAX macros
from osdep.h ?

C.

>> +static void read_fru_data(IPMIBmcSim *ibs,
>> +                         uint8_t *cmd, unsigned int cmd_len,
>> +                         RspBuffer *rsp)
>> +{
>> +    uint8_t fruid;
>> +    uint16_t offset;
>> +    int i;
>> +    uint8_t *fru_entry;
>> +    unsigned int count;
>> +
>> +    fruid = cmd[2];
>> +    offset = (cmd[3] | cmd[4] << 8);
>> +
>> +    if (fruid >= ibs->fru.nentries) {
>> +        rsp_buffer_set_error(rsp, IPMI_CC_INVALID_DATA_FIELD);
>> +        return;
>> +    }
>> +
>> +    if (offset >= ibs->fru.areasize - 1) {
>> +        rsp_buffer_set_error(rsp, IPMI_CC_INVALID_DATA_FIELD);
>> +        return;
>> +    }
>> +
>> +    fru_entry = &ibs->fru.data[fruid * ibs->fru.areasize];
>> +
>> +    count = min(cmd[5], ibs->fru.areasize - offset);
>> +
>> +    rsp_buffer_push(rsp, count & 0xff);
>> +    for (i = 0; i < count; i++) {
>> +        rsp_buffer_push(rsp, fru_entry[offset + i]);
>> +    }
>> +}
>> +
>> +static void write_fru_data(IPMIBmcSim *ibs,
>> +                         uint8_t *cmd, unsigned int cmd_len,
>> +                         RspBuffer *rsp)
>> +{
>> +    uint8_t fruid;
>> +    uint16_t offset;
>> +    uint8_t *fru_entry;
>> +    unsigned int count;
>> +
>> +    fruid = cmd[2];
>> +    offset = (cmd[3] | cmd[4] << 8);
>> +
>> +    if (fruid >= ibs->fru.nentries) {
>> +        rsp_buffer_set_error(rsp, IPMI_CC_INVALID_DATA_FIELD);
>> +        return;
>> +    }
>> +
>> +    if (offset >= ibs->fru.areasize - 1) {
>> +        rsp_buffer_set_error(rsp, IPMI_CC_INVALID_DATA_FIELD);
>> +        return;
>> +    }
>> +
>> +    fru_entry = &ibs->fru.data[fruid * ibs->fru.areasize];
>> +
>> +    count = min(cmd_len - 5, ibs->fru.areasize - offset);
>> +
>> +    memcpy(fru_entry + offset, cmd + 5, count);
>> +
>> +    rsp_buffer_push(rsp, count & 0xff);
>> +}
>> +
>>  static void reserve_sel(IPMIBmcSim *ibs,
>>                          uint8_t *cmd, unsigned int cmd_len,
>>                          RspBuffer *rsp)
>> @@ -1658,6 +1757,9 @@ static const IPMINetfn app_netfn = {
>>  };
>>  
>>  static const IPMICmdHandler storage_cmds[] = {
>> +    [IPMI_CMD_GET_FRU_AREA_INFO] = { get_fru_area_info, 3 },
>> +    [IPMI_CMD_READ_FRU_DATA] = { read_fru_data, 5 },
>> +    [IPMI_CMD_WRITE_FRU_DATA] = { write_fru_data, 5 },
>>      [IPMI_CMD_GET_SDR_REP_INFO] = { get_sdr_rep_info },
>>      [IPMI_CMD_RESERVE_SDR_REP] = { reserve_sdr_rep },
>>      [IPMI_CMD_GET_SDR] = { get_sdr, 8 },
>> @@ -1760,6 +1862,31 @@ static const VMStateDescription vmstate_
>>      }
>>  };
>>  
>> +static void ipmi_fru_init(IPMIFru *fru)
>> +{
>> +    int fsize;
>> +    int size = 0;
>> +
>> +    fsize = get_image_size(fru->filename);
>> +    if (fsize > 0) {
>> +        size = QEMU_ALIGN_UP(fsize, fru->areasize);
>> +        fru->data = g_malloc0(size);
>> +        if (load_image_size(fru->filename, fru->data, fsize) != fsize) {
>> +            error_report("Could not load file '%s'", fru->filename);
>> +            g_free(fru->data);
>> +            fru->data = NULL;
>> +        }
>> +    }
>> +
>> +    if (!fru->data) {
>> +        /* give one default FRU */
>> +        size = fru->areasize;
>> +        fru->data = g_malloc0(size);
>> +    }
>> +
>> +    fru->nentries = size / fru->areasize;
>> +}
>> +
>>  static void ipmi_sim_realize(DeviceState *dev, Error **errp)
>>  {
>>      IPMIBmc *b = IPMI_BMC(dev);
>> @@ -1782,6 +1909,8 @@ static void ipmi_sim_realize(DeviceState
>>  
>>      ipmi_sdr_init(ibs);
>>  
>> +    ipmi_fru_init(&ibs->fru);
>> +
>>      ibs->acpi_power_state[0] = 0;
>>      ibs->acpi_power_state[1] = 0;
>>  
>> @@ -1800,6 +1929,8 @@ static void ipmi_sim_realize(DeviceState
>>  }
>>  
>>  static Property ipmi_sim_properties[] = {
>> +    DEFINE_PROP_UINT16("fruareasize", IPMIBmcSim, fru.areasize, 1024),
>> +    DEFINE_PROP_STRING("frudatafile", IPMIBmcSim, fru.filename),
>>      DEFINE_PROP_STRING("sdrfile", IPMIBmcSim, sdr_filename),
>>      DEFINE_PROP_END_OF_LIST(),
>>  };
>> Index: qemu-powernv.git/qemu-options.hx
>> ===================================================================
>> --- qemu-powernv.git.orig/qemu-options.hx
>> +++ qemu-powernv.git/qemu-options.hx
>> @@ -387,7 +387,7 @@ possible drivers and properties, use @co
>>  @code{-device @var{driver},help}.
>>  
>>  Some drivers are:
>> address@hidden -device 
>> ipmi-bmc-sim,address@hidden,address@hidden,address@hidden
>> address@hidden -device 
>> ipmi-bmc-sim,address@hidden,address@hidden,address@hidden,address@hidden,address@hidden
>>  
>>  Add an IPMI BMC.  This is a simulation of a hardware management
>>  interface processor that normally sits on a system.  It provides
>> @@ -405,7 +405,11 @@ The BMC to connect to, one of ipmi-bmc-s
>>  @item address@hidden
>>  Define slave address to use for the BMC.  The default is 0x20.
>>  @item address@hidden
>> -file containing raw Sensor Data Records (SDR) data.  The default is none.
>> +file containing raw Sensor Data Records (SDR) data. The default is none.
>> address@hidden address@hidden
>> +size of a Field Replaceable Unit (FRU) area.  The default is 1024.
>> address@hidden address@hidden
>> +file containing raw Field Replaceable Unit (FRU) inventory data. The 
>> default is none.
>>  @end table
>>  
>>  @item -device ipmi-bmc-extern,address@hidden,address@hidden,address@hidden
>