Re: [Qemu-devel] [RFC PATCH 6/6] hw/ppc/pnv_homer: add python interface support for homer/occ common area

[Balamuruhan S <bala24@linux.ibm.com>]

On 8/9/19 10:16 AM, David Gibson wrote:
> On Wed, Aug 07, 2019 at 12:44:45PM +0530, Balamuruhan S wrote:
>> use python interface APIs in homer/occ common area emulation to
>> interact with scripts if provided else fallback to normal flow,
>> it shows how simple to use the interface to call python methods
>> with any number of arguments in any script placed in common
>> -module-path provided in qemu commandline.
> What's the use case for this?

The usecase can be performing multiple boot test of the vm or during runtime
with different values expected/unexpected by firmware/kernel and check
how it is behaving or how it should behave.

It can be used as a framework for CI or regression.

>
>> Signed-off-by: Balamuruhan S <bala24@linux.ibm.com>
>> ---
>>  hw/ppc/pnv_homer.c      | 20 ++++++++++++++++++++
>>  hw/ppc/pnv_xscom.c      |  9 +++++----
>>  include/sysemu/sysemu.h |  4 ++++
>>  vl.c                    | 24 ++++++++++++++++++++++++
>>  4 files changed, 53 insertions(+), 4 deletions(-)
>>
>> diff --git a/hw/ppc/pnv_homer.c b/hw/ppc/pnv_homer.c
>> index 73a94856d0..6ae5e74f19 100644
>> --- a/hw/ppc/pnv_homer.c
>> +++ b/hw/ppc/pnv_homer.c
>> @@ -16,7 +16,9 @@
>>   * You should have received a copy of the GNU Lesser General Public
>>   * License along with this library; if not, see <http://www.gnu.org/licenses/>.
>>   */
>> +#include "sysemu/python_api.h"
>>  #include "qemu/osdep.h"
>> +#include "sysemu/sysemu.h"
>>  #include "sysemu/hw_accel.h"
>>  #include "sysemu/cpus.h"
>>  #include "hw/ppc/pnv.h"
>> @@ -37,6 +39,15 @@ static bool core_max_array(hwaddr addr)
>>  
>>  static uint64_t homer_read(void *opaque, hwaddr addr, unsigned width)
>>  {
>> +    if (homer_module && homer) {
>> +        uint64_t homer_ret;
>> +        char **address = g_malloc(sizeof(uint64_t));
>> +        python_args_init_cast_long(address, addr, 0);
>> +        homer_ret = python_callback_int(module_path, homer_module, homer, address, 1);
>> +        python_args_clean(address, 1);
>> +        g_free(address);
>> +        return homer_ret;
>> +    }
>>      switch (addr) {
>>          case 0xe2006:  /* max pstate ultra turbo */
>>          case 0xe2018:  /* pstate id for 0 */
>> @@ -106,6 +117,15 @@ const MemoryRegionOps pnv_homer_ops = {
>>  
>>  static uint64_t occ_common_area_read(void *opaque, hwaddr addr, unsigned width)
>>  {
>> +    if (occ_module && occ) {
>> +        uint64_t occ_ret;
>> +        char **address = g_malloc(sizeof(uint64_t));
>> +        python_args_init_cast_long(address, addr, 0);
>> +        occ_ret = python_callback_int(module_path, occ_module, occ, address, 1);
>> +        python_args_clean(address, 1);
>> +        g_free(address);
>> +        return occ_ret;
>> +    }
>>      switch (addr) {
>>          /*
>>           * occ-sensor sanity check that asserts the sensor
>> diff --git a/hw/ppc/pnv_xscom.c b/hw/ppc/pnv_xscom.c
>> index 18a780bcdf..5e41b7c953 100644
>> --- a/hw/ppc/pnv_xscom.c
>> +++ b/hw/ppc/pnv_xscom.c
>> @@ -179,13 +179,14 @@ static uint64_t xscom_read(void *opaque, hwaddr addr, unsigned width)
>>      MemTxResult result;
>>  
>>      if (xscom_module && xscom_readp) {
>> -        char **args = g_malloc(2 * sizeof(uint64_t));
>> +        char **args = g_malloc(3 * sizeof(uint64_t));
>>          PnvChipClass *pcc = PNV_CHIP_GET_CLASS(chip);
>>          python_args_init_cast_long(args, pcba, 0);
>> -        python_args_init_cast_int(args, pcc->chip_type, 1);
>> +        python_args_init_cast_int(args, chip->chip_num, 1);
>> +        python_args_init_cast_int(args, pcc->chip_type, 2);
>>          val = python_callback_int(module_path, xscom_module, xscom_readp,
>> -                                  args, 2);
>> -        python_args_clean(args, 2);
>> +                                  args, 3);
>> +        python_args_clean(args, 3);
>>          g_free(args);
>>      }
>>      else {
>> diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
>> index 9b8dc346d6..3c8119e040 100644
>> --- a/include/sysemu/sysemu.h
>> +++ b/include/sysemu/sysemu.h
>> @@ -121,6 +121,10 @@ extern const char *module_path;
>>  extern const char *xscom_module;
>>  extern const char *xscom_readp;
>>  extern const char *xscom_writep;
>> +extern const char *homer_module;
>> +extern const char *homer;
>> +extern const char *occ_module;
>> +extern const char *occ;
>>  extern int mem_prealloc;
>>  
>>  #define MAX_NODES 128
>> diff --git a/vl.c b/vl.c
>> index 28f0dc1c1b..c96d35d907 100644
>> --- a/vl.c
>> +++ b/vl.c
>> @@ -144,6 +144,10 @@ const char *module_path = NULL;
>>  const char *xscom_module = NULL;
>>  const char *xscom_readp = NULL;
>>  const char *xscom_writep = NULL;
>> +const char *homer_module = NULL;
>> +const char *homer = NULL;
>> +const char *occ_module = NULL;
>> +const char *occ = NULL;
>>  int mem_prealloc = 0; /* force preallocation of physical target memory */
>>  bool enable_mlock = false;
>>  bool enable_cpu_pm = false;
>> @@ -495,6 +499,22 @@ static QemuOptsList qemu_module_opts = {
>>              .name = "xscom_write",
>>              .type = QEMU_OPT_STRING,
>>          },
>> +        {
>> +            .name = "homer_module",
>> +            .type = QEMU_OPT_STRING,
>> +        },
>> +        {
>> +            .name = "homer",
>> +            .type = QEMU_OPT_STRING,
>> +        },
>> +        {
>> +            .name = "occ_module",
>> +            .type = QEMU_OPT_STRING,
>> +        },
>> +        {
>> +            .name = "occ",
>> +            .type = QEMU_OPT_STRING,
>> +        },
>>          { /* end of list */ }
>>      },
>>  };
>> @@ -3231,6 +3251,10 @@ int main(int argc, char **argv, char **envp)
>>                  xscom_module = qemu_opt_get(opts, "xscom_module");
>>                  xscom_readp = qemu_opt_get(opts, "xscom_read");
>>                  xscom_writep = qemu_opt_get(opts, "xscom_write");
>> +                homer_module = qemu_opt_get(opts, "homer_module");
>> +                homer = qemu_opt_get(opts, "homer");
>> +                occ_module = qemu_opt_get(opts, "occ_module");
>> +                occ = qemu_opt_get(opts, "occ");
>>                  break;
>>              case QEMU_OPTION_mem_prealloc:
>>                  mem_prealloc = 1;