linux-kernel - Re: [PATCH 1/2] pata_legacy: export functionality to ide

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Date:	Wed, 06 Aug 2008 19:57:40 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	petkovbb@...il.com
Cc:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [PATCH 1/2] pata_legacy: export functionality to ide

Boris Petkov wrote:

>>>From: Borislav Petkov <petkovbb@...il.com>
>>>Date: Sun, 3 Aug 2008 18:46:35 +0200
>>>Subject: [PATCH] ide-generic: handle probing of legacy io-ports v4

>>>Avoid probing the io-ports in case an IDE PCI controller is present and it uses
>>>the legacy iobases. If we still want to enforce the probing, we do

>>>ide_generic.probe_mask=0x3f

>>>on the kernel command line. The iobase checking code is adapted from
>>>drivers/ata/pata_legacy.c after converting hex pci ids into their
>>>corresponding
>>>macros in <linux/pci_ids.h>.

>>>CC: Sergei Shtylyov <sshtylyov@...mvista.com>
>>>Signed-off-by: Borislav Petkov <petkovbb@...il.com>

>>Acked-by: Sergei Shtylyov <sshtylyov@...mvista.com>

>>>diff --git a/drivers/ide/ide-generic.c b/drivers/ide/ide-generic.c
>>>index 8fe8b5b..efce159 100644
>>>--- a/drivers/ide/ide-generic.c
>>>+++ b/drivers/ide/ide-generic.c

>>[...]

>>>@@ -100,19 +101,69 @@ static const u16 legacy_bases[] = { 0x1f0, 0x170,
>>>0x1e8, 0x168, 0x1e0, 0x160 };
>>> static const int legacy_irqs[]  = { 14, 15, 11, 10, 8, 12 };
>>> #endif
>>> +static void ide_generic_check_pci_legacy_iobases(int *primary, int
>>>*secondary)
>>>+{
>>>+       struct pci_dev *p = NULL;
>>>+       u16 val;
>>>+
>>>+       for_each_pci_dev(p) {
>>>+               int r;
>>>+
>>>+               for (r = 0; r < 6; r++) {
>>>+                       if (pci_resource_start(p, r) == 0x1f0)
>>>+                               *primary = 1;
>>>+                       if (pci_resource_start(p, r) == 0x170)
>>>+                               *secondary = 1;
>>>+               }

>> Would have been probably enough to test only BAR0/2, don't you think?

> I assume you're referring to the legacy ioports fixup in
> drivers/pci/probe.c:pci_setup_device().

    And to the fact that the value 0x1f0 should only be ever seen in BAR0 and 
0x170 in BAR2 even if they would have been read off the chips (some chips have 
these values reading back even in legacy mode, and even could malfunction if 
other values are written there), not fixed up there, and certainly not in BAR1 
or BAR3, so it's quite pointless to look in these BARs too.

WBR, Sergei
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