From owner-freebsd-mips@FreeBSD.ORG Wed Sep 1 07:07:38 2010
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From: "Jayachandran C." <c.jayachandran@gmail.com>
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Subject: busdma_machdep.c with more than 512M memory
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I was looking at a few crashes I see with PCI drivers, and I think it
is caused by an issue in busdma_machdep.c where physical address is
directly converted using MIPS_PHYS_TO_KSEG1. I have not looked at it
in detail, but it looks obviously wrong.
Any suggestions on how to fix thiis is welcome, it probably needs an
uncached TLB entry. On 64bit we could use XKPHYS uncached.
---
632 if (newmap->flags & DMAMAP_UNCACHEABLE) {
633 void *tmpaddr = (void *)*vaddr;
634
635 if (tmpaddr) {
636 tmpaddr = (void
*)MIPS_PHYS_TO_KSEG1(vtophys(tmpaddr));
637 newmap->origbuffer = *vaddr;
638 newmap->allocbuffer = tmpaddr;
639 mips_dcache_wbinv_range((vm_offset_t)*vaddr,
640 dmat->maxsize);
641 *vaddr = tmpaddr;
642 }
---
1361 bpage->busaddr = pmap_kextract(bpage->vaddr);
1362 bpage->vaddr_nocache =
1363 (vm_offset_t)MIPS_PHYS_TO_KSEG1(bpage->busaddr);
1364 mtx_lock(&bounce_lock);
Thanks,
JC.
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Subject: RE: Re: Now partially booting on our CN58XX eval board
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Juli
Thanks for the pointer regarding limiting the bootmem to 512M. I modified w=
hat gets passed to cvmx_bootmem_phy_alloc in the max_addr parameter.
That gets us past the panic and brings the kernel up to a prompt.
No failure conditions observed on the console
>From the shell prompt all seems well.
But when we try and ping in or out we seem to get a panic from the ethernet=
controller.
It does not happen all of the time. It usually take 50 - 200 pings to cause=
the problem.
I have isolated it to a few places in cvm_oct_tasklet_rx function in ethern=
et-rx.c.
1. At line 293 . it looks like the entire packet is stored in the work entr=
y. I can see the panic in the code, but on the console it also indicates a =
NULL ptr being passed to cvmx_phys_to_ptr. Not sure if the NULL pointer is =
caused by the panic. This is what is on the console
root@-2-/root# WARNING:
cvmx_phys_to_ptr() passed a zero address
panic: cvm_oct_tasklet_rx: not yet implemented; copy in small packet.
KDB: enter: panic
[ thread pid 0 tid 100016 ]
Stopped at kdb_enter+0x50: lui at,0x8358
db>
2. At line 406 of the same file. Calling cvm_oct_mem_fill_fpa results in a =
TLB miss (store).
Any ideas
Thanks for your help
Paul Heyman
pheyman@adaranetworks.com
-------- Original Message --------
Subject: Re: Now partially booting on our CN58XX eval board
Date: Fri, 27 Aug 2010 12:57:18 -0700
From: Juli Mallett <jmallett@FreeBSD.org><mailto:jmallett@FreeBSD.org>
To: Patrick Mahan <pmahan@adaranet.com><mailto:pmahan@adaranet.com>
CC: freebsd-mips@freebsd.org<mailto:freebsd-mips@freebsd.org> <freebsd-=
mips@freebsd.org><mailto:freebsd-mips@freebsd.org>
On Fri, Aug 27, 2010 at 11:16, Patrick Mahan <pmahan@adaranet.com><mailto:p=
mahan@adaranet.com> wrote:
> I have an engineer that thinks this would be fun to resolve, so I am lett=
ing
> him run with this for now. Is this an address coming from the mii layer?
I looked at the code and Warner's output a few weeks ago and it seems
to be an address coming from the command queue code
(cvmx-cmd-queue.{c,h} in the Simple Executive) or maybe it was the FPA
code. I think I told Warner that it was happening because mbufs are
put into the FPA and we don't have a way to create an ephemeral
mapping given a physical address that is not direct-mappable. Making
it so that your system won't allocate mbufs above 0x2.... is a quick
hack to test that theory and a reasonable workaround for o32 (since
Octeon really makes more sense with n64 kernels, at minimum) so I'd
suggest modifying the memory setup code in octeon_machdep.c to not add
any memory above 512M or whatever.
If you have an engineer with some time, though, I'd suggest having
them work on COMPAT_FREEBSD32 for o32, which should be around a day or
two worth of work and would let you use an n64 kernel. :)
Juli.
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Subject: Re: Now partially booting on our CN58XX eval board
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X-List-Received-Date: Fri, 03 Sep 2010 18:38:27 -0000
On Fri, 3 Sep 2010 08:17:16 -0700
Paul Heyman <PHeyman@adaranet.com> mentioned:
> Juli
>
> Thanks for the pointer regarding limiting the bootmem to 512M. I modified what gets passed to cvmx_bootmem_phy_alloc in the max_addr parameter.
>
> That gets us past the panic and brings the kernel up to a prompt.
> No failure conditions observed on the console
> >From the shell prompt all seems well.
>
> But when we try and ping in or out we seem to get a panic from the ethernet controller.
> It does not happen all of the time. It usually take 50 - 200 pings to cause the problem.
> I have isolated it to a few places in cvm_oct_tasklet_rx function in ethernet-rx.c.
>
> 1. At line 293 . it looks like the entire packet is stored in the work entry. I can see the panic in the code, but on the console it also indicates a NULL ptr being passed to cvmx_phys_to_ptr. Not sure if the NULL pointer is caused by the panic. This is what is on the console
>
> root@-2-/root# WARNING:
> cvmx_phys_to_ptr() passed a zero address
> panic: cvm_oct_tasklet_rx: not yet implemented; copy in small packet.
> KDB: enter: panic
> [ thread pid 0 tid 100016 ]
> Stopped at kdb_enter+0x50: lui at,0x8358
> db>
>
> 2. At line 406 of the same file. Calling cvm_oct_mem_fill_fpa results in a TLB miss (store).
>
Hey, Paul!
Try the following patch.
It fixed the problem for me, but I had
no time to commit it yet.
Index: sys/mips/cavium/octe/cavium-ethernet.h
===================================================================
--- sys/mips/cavium/octe/cavium-ethernet.h (revision 208288)
+++ sys/mips/cavium/octe/cavium-ethernet.h (working copy)
@@ -119,6 +119,8 @@
struct ifmedia media;
int if_flags;
+
+ struct mtx tx_mtx;
} cvm_oct_private_t;
Index: sys/mips/cavium/octe/octe.c
===================================================================
--- sys/mips/cavium/octe/octe.c (revision 208288)
+++ sys/mips/cavium/octe/octe.c (working copy)
@@ -78,6 +78,9 @@
#include "miibus_if.h"
+#define OCTE_TX_LOCK(priv) mtx_lock(&(priv)->tx_mtx)
+#define OCTE_TX_UNLOCK(priv) mtx_unlock(&(priv)->tx_mtx)
+
static int octe_probe(device_t);
static int octe_attach(device_t);
static int octe_detach(device_t);
@@ -174,6 +177,8 @@
priv->if_flags = ifp->if_flags;
+ mtx_init(&priv->tx_mtx, ifp->if_xname, "octe tx send queue", MTX_DEF);
+
for (qos = 0; qos < 16; qos++) {
mtx_init(&priv->tx_free_queue[qos].ifq_mtx, ifp->if_xname, "octe tx free queue", MTX_DEF);
IFQ_SET_MAXLEN(&priv->tx_free_queue[qos], MAX_OUT_QUEUE_DEPTH);
@@ -181,9 +186,11 @@
ether_ifattach(ifp, priv->mac);
+ OCTE_TX_LOCK(priv);
IFQ_SET_MAXLEN(&ifp->if_snd, MAX_OUT_QUEUE_DEPTH);
ifp->if_snd.ifq_drv_maxlen = MAX_OUT_QUEUE_DEPTH;
IFQ_SET_READY(&ifp->if_snd);
+ OCTE_TX_UNLOCK(priv);
return (0);
}
@@ -280,8 +287,11 @@
if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) != IFF_DRV_RUNNING)
return;
+ OCTE_TX_LOCK(priv);
while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) {
IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
+ if (m == NULL)
+ break;
/*
* XXX
@@ -301,17 +311,21 @@
* (3) do the collapse here.
*/
+ OCTE_TX_UNLOCK(priv);
if (priv->queue != -1) {
error = cvm_oct_xmit(m, ifp);
} else {
error = cvm_oct_xmit_pow(m, ifp);
}
+ OCTE_TX_LOCK(priv);
if (error != 0) {
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
+ OCTE_TX_UNLOCK(priv);
return;
}
}
+ OCTE_TX_UNLOCK(priv);
}
static int
--
Stanislav Sedov
ST4096-RIPE