linux-kernel - [PATCH 5.4 148/184] powerpc/eeh: Fix EEH handling for hugepages in ioremap space.

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Message-Id: <20210510101954.973676014@linuxfoundation.org>
Date:   Mon, 10 May 2021 12:20:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dominic DeMarco <ddemarc@...ibm.com>,
        Mahesh Salgaonkar <mahesh@...ux.ibm.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 5.4 148/184] powerpc/eeh: Fix EEH handling for hugepages in ioremap space.

From: Mahesh Salgaonkar <mahesh@...ux.ibm.com>

commit 5ae5bc12d0728db60a0aa9b62160ffc038875f1a upstream.

During the EEH MMIO error checking, the current implementation fails to map
the (virtual) MMIO address back to the pci device on radix with hugepage
mappings for I/O. This results into failure to dispatch EEH event with no
recovery even when EEH capability has been enabled on the device.

eeh_check_failure(token)		# token = virtual MMIO address
  addr = eeh_token_to_phys(token);
  edev = eeh_addr_cache_get_dev(addr);
  if (!edev)
	return 0;
  eeh_dev_check_failure(edev);	<= Dispatch the EEH event

In case of hugepage mappings, eeh_token_to_phys() has a bug in virt -> phys
translation that results in wrong physical address, which is then passed to
eeh_addr_cache_get_dev() to match it against cached pci I/O address ranges
to get to a PCI device. Hence, it fails to find a match and the EEH event
never gets dispatched leaving the device in failed state.

The commit 33439620680be ("powerpc/eeh: Handle hugepages in ioremap space")
introduced following logic to translate virt to phys for hugepage mappings:

eeh_token_to_phys():
+	pa = pte_pfn(*ptep);
+
+	/* On radix we can do hugepage mappings for io, so handle that */
+       if (hugepage_shift) {
+               pa <<= hugepage_shift;			<= This is wrong
+               pa |= token & ((1ul << hugepage_shift) - 1);
+       }

This patch fixes the virt -> phys translation in eeh_token_to_phys()
function.

  $ cat /sys/kernel/debug/powerpc/eeh_address_cache
  mem addr range [0x0000040080000000-0x00000400807fffff]: 0030:01:00.1
  mem addr range [0x0000040080800000-0x0000040080ffffff]: 0030:01:00.1
  mem addr range [0x0000040081000000-0x00000400817fffff]: 0030:01:00.0
  mem addr range [0x0000040081800000-0x0000040081ffffff]: 0030:01:00.0
  mem addr range [0x0000040082000000-0x000004008207ffff]: 0030:01:00.1
  mem addr range [0x0000040082080000-0x00000400820fffff]: 0030:01:00.0
  mem addr range [0x0000040082100000-0x000004008210ffff]: 0030:01:00.1
  mem addr range [0x0000040082110000-0x000004008211ffff]: 0030:01:00.0

Above is the list of cached io address ranges of pci 0030:01:00.<fn>.

Before this patch:

Tracing 'arg1' of function eeh_addr_cache_get_dev() during error injection
clearly shows that 'addr=' contains wrong physical address:

   kworker/u16:0-7       [001] ....   108.883775: eeh_addr_cache_get_dev:
	   (eeh_addr_cache_get_dev+0xc/0xf0) addr=0x80103000a510

dmesg shows no EEH recovery messages:

  [  108.563768] bnx2x: [bnx2x_timer:5801(eth2)]MFW seems hanged: drv_pulse (0x9ae) != mcp_pulse (0x7fff)
  [  108.563788] bnx2x: [bnx2x_hw_stats_update:870(eth2)]NIG timer max (4294967295)
  [  108.883788] bnx2x: [bnx2x_acquire_hw_lock:2013(eth1)]lock_status 0xffffffff  resource_bit 0x1
  [  108.884407] bnx2x 0030:01:00.0 eth1: MDC/MDIO access timeout
  [  108.884976] bnx2x 0030:01:00.0 eth1: MDC/MDIO access timeout
  <..>

After this patch:

eeh_addr_cache_get_dev() trace shows correct physical address:

  <idle>-0       [001] ..s.  1043.123828: eeh_addr_cache_get_dev:
	  (eeh_addr_cache_get_dev+0xc/0xf0) addr=0x40080bc7cd8

dmesg logs shows EEH recovery getting triggerred:

  [  964.323980] bnx2x: [bnx2x_timer:5801(eth2)]MFW seems hanged: drv_pulse (0x746f) != mcp_pulse (0x7fff)
  [  964.323991] EEH: Recovering PHB#30-PE#10000
  [  964.324002] EEH: PE location: N/A, PHB location: N/A
  [  964.324006] EEH: Frozen PHB#30-PE#10000 detected
  <..>

Fixes: 33439620680b ("powerpc/eeh: Handle hugepages in ioremap space")
Cc: stable@...r.kernel.org # v5.3+
Reported-by: Dominic DeMarco <ddemarc@...ibm.com>
Signed-off-by: Mahesh Salgaonkar <mahesh@...ux.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/161821396263.48361.2796709239866588652.stgit@jupiter
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/powerpc/kernel/eeh.c |   11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

--- a/arch/powerpc/kernel/eeh.c
+++ b/arch/powerpc/kernel/eeh.c
@@ -368,14 +368,11 @@ static inline unsigned long eeh_token_to
 	pa = pte_pfn(*ptep);
 
 	/* On radix we can do hugepage mappings for io, so handle that */
-	if (hugepage_shift) {
-		pa <<= hugepage_shift;
-		pa |= token & ((1ul << hugepage_shift) - 1);
-	} else {
-		pa <<= PAGE_SHIFT;
-		pa |= token & (PAGE_SIZE - 1);
-	}
+	if (!hugepage_shift)
+		hugepage_shift = PAGE_SHIFT;
 
+	pa <<= PAGE_SHIFT;
+	pa |= token & ((1ul << hugepage_shift) - 1);
 	return pa;
 }