On Thu, 29 Nov 2007 13:31:50 +0100
Anders Henke <anders.henke@xxxxxxxx> wrote:
> On November 28 2007, Anders Henke wrote:
> > As "everything is reported as being zero" is quite odd an Jan took a
> > guess that it might be block-layer or driver-related, I've assumed
> > that the driver is responsible for this; just out of the curiousity,
> > I've manually replaced the dpt_i2o driver by the 2.6.19 one by copying
> > driver/scsi/dpt_i2o.c driver/scsi/dpti.h and driver/scsi/dpt/ into a
> > vanilla 2.6.23.1. kernel; using this kernel fixed the issue for me.
> >
> > I haven't yet fine-tested from which kernel release on the dpt_i2o driver
> > behaves like this and spews out zeroed blocks when trying to mount
> > the rootfs. Maybe this is just some timing issue.
>
> I've started the fine-tests and can say so far that dpt_i2o from
> 2.6.22 is still fine. Test is simple:
>
> anders@ista:/usr/src/linux-2.6.22/drivers/scsi/dpt$ cp -r dpt/ dpt_i2o.c dpti.h /usr/src/linux-2.6.23.1/drivers/scsi/
>
> ... recompile the kernel, reboot: works.
>
> 2.6.22 and 2.6.23 differ in terms of the dpt_i2o driver by two different
> patch sets:
> -one 2 Kb small set of patches from 2.6.22 to 2.6.22-rc1
> -one 7 Kb set of patches from 2.6.23-rc2 to 2.6.23-rc3
> -one 162 Kb set of patches from 2.6.23-rc9 to 2.6.23-rc10.
>
> When applying the 2.6.23-rc1-based driver to "my" 2.6.31.1 kernel,
> the "zero blocks"-symptom show up, so it's the "lucky" situation
> that the smallest patch actually seams to be the broken one.
>
> According to the 2.6.23-rc1 short-form changelog, there is
> one major edit on the dpt_i2o driver:
>
> FUJITA Tomonori
>
> [SCSI] dpt_i2o: convert to use the data buffer accessors
>
> Stephen Rothwell
> dpt_i2o depends on virt_to_bus
>
> Fujita, would you please take a look at this?
He won't have seen this. cc's added.
> I think that something's broken in there, leading to the dpt_i2o
> sending out blocks of zeroes right after initialization, at least on
> some specific controllers (in this case, Adaptec 2010S on Intel
> SE7501WV2S-based boxes).
>
> I don't have insight kernel driver development knowledge, so I'm
> quite out of help right now. Nevertheless, I'll add the diff
> from 2.6.22 to 2.6.23-rc1 in terms of dpt_i2o:
>
Can you please confirm that this revert (against 2.6.24-rc4) fixes the data
corruption problems?
Thanks.
diff -puN drivers/scsi/dpt_i2o.c~revert-dpt_i2o-convert-to-use-the-data-buffer-accessors drivers/scsi/dpt_i2o.c
--- a/drivers/scsi/dpt_i2o.c~revert-dpt_i2o-convert-to-use-the-data-buffer-accessors
+++ a/drivers/scsi/dpt_i2o.c
@@ -2062,13 +2062,12 @@ static s32 adpt_scsi_to_i2o(adpt_hba* pH
u32 *lenptr;
int direction;
int scsidir;
- int nseg;
u32 len;
u32 reqlen;
s32 rcode;
memset(msg, 0 , sizeof(msg));
- len = scsi_bufflen(cmd);
+ len = cmd->request_bufflen;
direction = 0x00000000;
scsidir = 0x00000000; // DATA NO XFER
@@ -2125,21 +2124,21 @@ static s32 adpt_scsi_to_i2o(adpt_hba* pH
lenptr=mptr++; /* Remember me - fill in when we know */
reqlen = 14; // SINGLE SGE
/* Now fill in the SGList and command */
+ if(cmd->use_sg) {
+ struct scatterlist *sg = (struct scatterlist *)cmd->request_buffer;
+ int sg_count = pci_map_sg(pHba->pDev, sg, cmd->use_sg,
+ cmd->sc_data_direction);
- nseg = scsi_dma_map(cmd);
- BUG_ON(nseg < 0);
- if (nseg) {
- struct scatterlist *sg;
len = 0;
- scsi_for_each_sg(cmd, sg, nseg, i) {
+ for(i = 0 ; i < sg_count; i++) {
*mptr++ = direction|0x10000000|sg_dma_len(sg);
len+=sg_dma_len(sg);
*mptr++ = sg_dma_address(sg);
- /* Make this an end of list */
- if (i == nseg - 1)
- mptr[-2] = direction|0xD0000000|sg_dma_len(sg);
+ sg++;
}
+ /* Make this an end of list */
+ mptr[-2] = direction|0xD0000000|sg_dma_len(sg-1);
reqlen = mptr - msg;
*lenptr = len;
@@ -2148,8 +2147,16 @@ static s32 adpt_scsi_to_i2o(adpt_hba* pH
len, cmd->underflow);
}
} else {
- *lenptr = len = 0;
- reqlen = 12;
+ *lenptr = len = cmd->request_bufflen;
+ if(len == 0) {
+ reqlen = 12;
+ } else {
+ *mptr++ = 0xD0000000|direction|cmd->request_bufflen;
+ *mptr++ = pci_map_single(pHba->pDev,
+ cmd->request_buffer,
+ cmd->request_bufflen,
+ cmd->sc_data_direction);
+ }
}
/* Stick the headers on */
@@ -2178,7 +2185,7 @@ static s32 adpt_i2o_to_scsi(void __iomem
hba_status = detailed_status >> 8;
// calculate resid for sg
- scsi_set_resid(cmd, scsi_bufflen(cmd) - readl(reply+5));
+ cmd->resid = cmd->request_bufflen - readl(reply+5);
pHba = (adpt_hba*) cmd->device->host->hostdata[0];
_
-
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