diff mbox series

[v2,1/9] pc-bios: s390x: cio.c cleanup and compile fix

Message ID 20200514123729.156283-2-frankja@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series pc-bios: s390x: Cleanup part 1 | expand

Commit Message

Janosch Frank May 14, 2020, 12:37 p.m. UTC 
Let's initialize the structs at the beginning to ease reading and also
zeroing all other fields. This also makes the compiler stop
compalining about sense_id_ccw.flags being ored into when it's not
initialized.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
---
 pc-bios/s390-ccw/cio.c | 36 ++++++++++++++++++------------------
 1 file changed, 18 insertions(+), 18 deletions(-)

Comments

David Hildenbrand May 18, 2020, 11:52 a.m. UTC | #1 
On 14.05.20 14:37, Janosch Frank wrote:
> Let's initialize the structs at the beginning to ease reading and also
> zeroing all other fields. This also makes the compiler stop
> compalining about sense_id_ccw.flags being ored into when it's not

s/compalining/complaining/

> initialized.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
>  pc-bios/s390-ccw/cio.c | 36 ++++++++++++++++++------------------
>  1 file changed, 18 insertions(+), 18 deletions(-)
> 
> diff --git a/pc-bios/s390-ccw/cio.c b/pc-bios/s390-ccw/cio.c
> index 339ec5fbe7..63301ebb58 100644
> --- a/pc-bios/s390-ccw/cio.c
> +++ b/pc-bios/s390-ccw/cio.c
> @@ -49,13 +49,13 @@ void enable_subchannel(SubChannelId schid)
>  
>  uint16_t cu_type(SubChannelId schid)
>  {
> -    Ccw1 sense_id_ccw;
>      SenseId sense_data;
> -
> -    sense_id_ccw.cmd_code = CCW_CMD_SENSE_ID;
> -    sense_id_ccw.cda = ptr2u32(&sense_data);
> -    sense_id_ccw.count = sizeof(sense_data);
> -    sense_id_ccw.flags |= CCW_FLAG_SLI;
> +    Ccw1 sense_id_ccw = {
> +        .cmd_code = CCW_CMD_SENSE_ID,
> +        .count = sizeof(sense_data),
> +        .flags = CCW_FLAG_SLI,
> +        .cda = ptr2u32(&sense_data),
> +    };
>  
>      if (do_cio(schid, CU_TYPE_UNKNOWN, ptr2u32(&sense_id_ccw), CCW_FMT1)) {
>          panic("Failed to run SenseID CCw\n");
> @@ -67,13 +67,13 @@ uint16_t cu_type(SubChannelId schid)
>  int basic_sense(SubChannelId schid, uint16_t cutype, void *sense_data,
>                   uint16_t data_size)
>  {
> -    Ccw1 senseCcw;
> +    Ccw1 senseCcw = {
> +        .cmd_code = CCW_CMD_BASIC_SENSE,
> +        .count = data_size,
> +        .cda = ptr2u32(sense_data),
> +    };
>      Irb irb;
>  
> -    senseCcw.cmd_code = CCW_CMD_BASIC_SENSE;
> -    senseCcw.cda = ptr2u32(sense_data);
> -    senseCcw.count = data_size;
> -
>      return __do_cio(schid, ptr2u32(&senseCcw), CCW_FMT1, &irb);
>  }
>  
> @@ -314,7 +314,13 @@ static void print_irb_err(Irb *irb)
>   */
>  static int __do_cio(SubChannelId schid, uint32_t ccw_addr, int fmt, Irb *irb)
>  {
> -    CmdOrb orb = {};
> +    CmdOrb orb = {
> +        .fmt = fmt,
> +        .pfch = 1,	/* QEMU's cio implementation requires prefetch */
> +        .c64 = 1,	/* QEMU's cio implementation requires 64-bit idaws */

Maybe just document this on top (all comments combined)

/*
 * QEMU's CIO implementation requires prefetch and 64-bit idaws. We
 * allow all paths.
 */

Or get rid of the tabs ;)

Reviewed-by: David Hildenbrand <david@redhat.com>
Janosch Frank May 18, 2020, 12:02 p.m. UTC | #2 
On 5/18/20 1:52 PM, David Hildenbrand wrote:
> On 14.05.20 14:37, Janosch Frank wrote:
>> Let's initialize the structs at the beginning to ease reading and also
>> zeroing all other fields. This also makes the compiler stop
>> compalining about sense_id_ccw.flags being ored into when it's not
> 
> s/compalining/complaining/
> 
>> initialized.
>>
>> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
>> Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
>>  pc-bios/s390-ccw/cio.c | 36 ++++++++++++++++++------------------
>>  1 file changed, 18 insertions(+), 18 deletions(-)
>>
>> diff --git a/pc-bios/s390-ccw/cio.c b/pc-bios/s390-ccw/cio.c
>> index 339ec5fbe7..63301ebb58 100644
>> --- a/pc-bios/s390-ccw/cio.c
>> +++ b/pc-bios/s390-ccw/cio.c
>> @@ -49,13 +49,13 @@ void enable_subchannel(SubChannelId schid)
>>  
>>  uint16_t cu_type(SubChannelId schid)
>>  {
>> -    Ccw1 sense_id_ccw;
>>      SenseId sense_data;
>> -
>> -    sense_id_ccw.cmd_code = CCW_CMD_SENSE_ID;
>> -    sense_id_ccw.cda = ptr2u32(&sense_data);
>> -    sense_id_ccw.count = sizeof(sense_data);
>> -    sense_id_ccw.flags |= CCW_FLAG_SLI;
>> +    Ccw1 sense_id_ccw = {
>> +        .cmd_code = CCW_CMD_SENSE_ID,
>> +        .count = sizeof(sense_data),
>> +        .flags = CCW_FLAG_SLI,
>> +        .cda = ptr2u32(&sense_data),
>> +    };
>>  
>>      if (do_cio(schid, CU_TYPE_UNKNOWN, ptr2u32(&sense_id_ccw), CCW_FMT1)) {
>>          panic("Failed to run SenseID CCw\n");
>> @@ -67,13 +67,13 @@ uint16_t cu_type(SubChannelId schid)
>>  int basic_sense(SubChannelId schid, uint16_t cutype, void *sense_data,
>>                   uint16_t data_size)
>>  {
>> -    Ccw1 senseCcw;
>> +    Ccw1 senseCcw = {
>> +        .cmd_code = CCW_CMD_BASIC_SENSE,
>> +        .count = data_size,
>> +        .cda = ptr2u32(sense_data),
>> +    };
>>      Irb irb;
>>  
>> -    senseCcw.cmd_code = CCW_CMD_BASIC_SENSE;
>> -    senseCcw.cda = ptr2u32(sense_data);
>> -    senseCcw.count = data_size;
>> -
>>      return __do_cio(schid, ptr2u32(&senseCcw), CCW_FMT1, &irb);
>>  }
>>  
>> @@ -314,7 +314,13 @@ static void print_irb_err(Irb *irb)
>>   */
>>  static int __do_cio(SubChannelId schid, uint32_t ccw_addr, int fmt, Irb *irb)
>>  {
>> -    CmdOrb orb = {};
>> +    CmdOrb orb = {
>> +        .fmt = fmt,
>> +        .pfch = 1,	/* QEMU's cio implementation requires prefetch */
>> +        .c64 = 1,	/* QEMU's cio implementation requires 64-bit idaws */
> 
> Maybe just document this on top (all comments combined)
> 
> /*
>  * QEMU's CIO implementation requires prefetch and 64-bit idaws. We
>  * allow all paths.
>  */
> 
> Or get rid of the tabs ;)
> 
> Reviewed-by: David Hildenbrand <david@redhat.com>

Will do, thanks!
Thomas Huth May 20, 2020, 7:37 p.m. UTC | #3 
On 14/05/2020 14.37, Janosch Frank wrote:
> Let's initialize the structs at the beginning to ease reading and also
> zeroing all other fields. This also makes the compiler stop
> compalining about sense_id_ccw.flags being ored into when it's not
> initialized.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
>  pc-bios/s390-ccw/cio.c | 36 ++++++++++++++++++------------------
>  1 file changed, 18 insertions(+), 18 deletions(-)

With the nits mentioned by David fixed:

Reviewed-by: Thomas Huth <thuth@redhat.com>
diff mbox series

Patch

diff --git a/pc-bios/s390-ccw/cio.c b/pc-bios/s390-ccw/cio.c
index 339ec5fbe7..63301ebb58 100644
--- a/pc-bios/s390-ccw/cio.c
+++ b/pc-bios/s390-ccw/cio.c
@@ -49,13 +49,13 @@  void enable_subchannel(SubChannelId schid)
 
 uint16_t cu_type(SubChannelId schid)
 {
-    Ccw1 sense_id_ccw;
     SenseId sense_data;
-
-    sense_id_ccw.cmd_code = CCW_CMD_SENSE_ID;
-    sense_id_ccw.cda = ptr2u32(&sense_data);
-    sense_id_ccw.count = sizeof(sense_data);
-    sense_id_ccw.flags |= CCW_FLAG_SLI;
+    Ccw1 sense_id_ccw = {
+        .cmd_code = CCW_CMD_SENSE_ID,
+        .count = sizeof(sense_data),
+        .flags = CCW_FLAG_SLI,
+        .cda = ptr2u32(&sense_data),
+    };
 
     if (do_cio(schid, CU_TYPE_UNKNOWN, ptr2u32(&sense_id_ccw), CCW_FMT1)) {
         panic("Failed to run SenseID CCw\n");
@@ -67,13 +67,13 @@  uint16_t cu_type(SubChannelId schid)
 int basic_sense(SubChannelId schid, uint16_t cutype, void *sense_data,
                  uint16_t data_size)
 {
-    Ccw1 senseCcw;
+    Ccw1 senseCcw = {
+        .cmd_code = CCW_CMD_BASIC_SENSE,
+        .count = data_size,
+        .cda = ptr2u32(sense_data),
+    };
     Irb irb;
 
-    senseCcw.cmd_code = CCW_CMD_BASIC_SENSE;
-    senseCcw.cda = ptr2u32(sense_data);
-    senseCcw.count = data_size;
-
     return __do_cio(schid, ptr2u32(&senseCcw), CCW_FMT1, &irb);
 }
 
@@ -314,7 +314,13 @@  static void print_irb_err(Irb *irb)
  */
 static int __do_cio(SubChannelId schid, uint32_t ccw_addr, int fmt, Irb *irb)
 {
-    CmdOrb orb = {};
+    CmdOrb orb = {
+        .fmt = fmt,
+        .pfch = 1,	/* QEMU's cio implementation requires prefetch */
+        .c64 = 1,	/* QEMU's cio implementation requires 64-bit idaws */
+        .lpm = 0xFF,	/* All paths allowed */
+        .cpa = ccw_addr,
+    };
     int rc;
 
     IPL_assert(fmt == 0 || fmt == 1, "Invalid ccw format");
@@ -324,12 +330,6 @@  static int __do_cio(SubChannelId schid, uint32_t ccw_addr, int fmt, Irb *irb)
         IPL_assert(ccw_addr <= 0xFFFFFF - 8, "Invalid ccw address");
     }
 
-    orb.fmt = fmt;
-    orb.pfch = 1;  /* QEMU's cio implementation requires prefetch */
-    orb.c64 = 1;   /* QEMU's cio implementation requires 64-bit idaws */
-    orb.lpm = 0xFF; /* All paths allowed */
-    orb.cpa = ccw_addr;
-
     rc = ssch(schid, &orb);
     if (rc == 1 || rc == 2) {
         /* Subchannel status pending or busy. Eat status and ask for retry. */