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SubjectRe: [RFC PATCH 74/71] ncr5380: Enable PDMA for NCR53C400A

On Mon, 30 Nov 2015, Ondrej Zary wrote:

> On Monday 30 November 2015, Finn Thain wrote:
> >
> > On Sun, 29 Nov 2015, Ondrej Zary wrote:
> >
> > > Add I/O register mapping for NCR53C400A and enable PDMA mode to
> > > improve performance and fix non-working IRQ.
> > >
> >
> > Is CONFIG_SCSI_GENERIC_NCR53C400 is still needed? Can the driver be fully
> > configured at runtime now?
>
> Things depending on CONFIG_SCSI_GENERIC_NCR53C400:
>
> #ifdef CONFIG_SCSI_GENERIC_NCR53C400
> #define PSEUDO_DMA
> #endif
>
> Defining PSEUDO_DMA should not break anything, just makes code bigger a
> bit. We can probably just define it always in g_NCR5380.c.

Based on your test results, I think so.

>
>
> This looks weird. I don't have any card with a BIOS to test.
> #ifdef CONFIG_SCSI_GENERIC_NCR53C400
> #define BIOSPARAM
> #define NCR5380_BIOSPARAM generic_NCR5380_biosparam
> #else
> #define NCR5380_BIOSPARAM NULL
> #endif
>

I'm guessing that when you said "weird", you meant that it is weird to tie
BIOSPARAM to CONFIG_SCSI_GENERIC_NCR53C400, because a 53C400-compatible
device does not imply a card ROM, and generic_NCR5380_biosparam() does not
require any particular device...

Regardless, the Kconfig help text doesn't say anything about bios_param,
so I think that the weirdness you referred to should not prevent removal
of CONFIG_SCSI_GENERIC_NCR53C400. I'm happy to let users manually #define
BIOSPARAM if the default scsicam_bios_param() doesn't work. See patch
below for example.

But if scsicam_bios_param() is adequate, or if generic_NCR5380_biosparam()
is inadequate, then we should also remove generic_NCR5380_biosparam(),
NCR5380_BIOSPARAM and BIOSPARAM. I'm not sufficiently familiar with this
platform to say one way or the other.

>
> This looks very wrong and should be done at runtime:
> #ifdef CONFIG_SCSI_GENERIC_NCR53C400
> #define NCR5380_region_size 16
> #else
> #define NCR5380_region_size 8
> #endif
>

I'll have to leave that fix to you.

Thanks.


Index: linux/drivers/scsi/Kconfig
===================================================================
--- linux.orig/drivers/scsi/Kconfig 2015-12-06 12:29:36.000000000 +1100
+++ linux/drivers/scsi/Kconfig 2015-12-06 13:47:50.000000000 +1100
@@ -816,17 +816,6 @@ config SCSI_GENERIC_NCR5380_MMIO
To compile this driver as a module, choose M here: the
module will be called g_NCR5380_mmio.

-config SCSI_GENERIC_NCR53C400
- bool "Enable NCR53c400 extensions"
- depends on SCSI_GENERIC_NCR5380
- help
- This enables certain optimizations for the NCR53c400 SCSI cards.
- You might as well try it out. Note that this driver will only probe
- for the Trantor T130B in its default configuration; you might have
- to pass a command line option to the kernel at boot time if it does
- not detect your card. See the file
- <file:Documentation/scsi/g_NCR5380.txt> for details.
-
config SCSI_IPS
tristate "IBM ServeRAID support"
depends on PCI && SCSI
Index: linux/drivers/scsi/g_NCR5380.c
===================================================================
--- linux.orig/drivers/scsi/g_NCR5380.c 2015-12-06 12:31:23.000000000 +1100
+++ linux/drivers/scsi/g_NCR5380.c 2015-12-06 13:45:42.000000000 +1100
@@ -57,10 +57,7 @@
*/

#define AUTOPROBE_IRQ
-
-#ifdef CONFIG_SCSI_GENERIC_NCR53C400
#define PSEUDO_DMA
-#endif

#include <asm/io.h>
#include <linux/blkdev.h>
@@ -506,6 +503,9 @@ generic_NCR5380_biosparam(struct scsi_de
ip[2] = capacity >> 11;
return 0;
}
+#define NCR5380_BIOSPARAM generic_NCR5380_biosparam
+#else
+#define NCR5380_BIOSPARAM NULL
#endif

#ifdef PSEUDO_DMA
Index: linux/drivers/scsi/g_NCR5380.h
===================================================================
--- linux.orig/drivers/scsi/g_NCR5380.h 2015-12-06 12:30:42.000000000 +1100
+++ linux/drivers/scsi/g_NCR5380.h 2015-12-06 13:47:12.000000000 +1100
@@ -14,13 +14,6 @@
#ifndef GENERIC_NCR5380_H
#define GENERIC_NCR5380_H

-#ifdef CONFIG_SCSI_GENERIC_NCR53C400
-#define BIOSPARAM
-#define NCR5380_BIOSPARAM generic_NCR5380_biosparam
-#else
-#define NCR5380_BIOSPARAM NULL
-#endif
-
#define __STRVAL(x) #x
#define STRVAL(x) __STRVAL(x)

@@ -31,11 +24,9 @@
#define NCR5380_map_name port
#define NCR53C400_register_offset 0

-#ifdef CONFIG_SCSI_GENERIC_NCR53C400
-#define NCR5380_region_size 16
-#else
-#define NCR5380_region_size 8
-#endif
+// FIXME
+// #define NCR5380_region_size 16
+// #define NCR5380_region_size 8

#define NCR5380_read(reg) \
inb(instance->io_port + (reg))

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