- 05 Dec, 2013 11 commits
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Mahesh Salgaonkar authored
Now that we are ready to handle machine check directly in linux, do not register with firmware to handle machine check exception. Signed-off-by:
Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Signed-off-by:
Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Mahesh Salgaonkar authored
When machine check real mode handler can not continue into host kernel in V mode, it returns from the interrupt and we loose MCE event which never gets logged. In such a situation queue up the MCE event so that we can log it later when we get back into host kernel with r1 pointing to kernel stack e.g. during syscall exit. Signed-off-by:
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Mahesh Salgaonkar authored
Now that we handle machine check in linux, the MCE decoding should also take place in linux host. This info is crucial to log before we go down in case we can not handle the machine check errors. This patch decodes and populates a machine check event which contain high level meaning full MCE information. We do this in real mode C code with ME bit on. The MCE information is still available on emergency stack (in pt_regs structure format). Even if we take another exception at this point the MCE early handler will allocate a new stack frame on top of current one. So when we return back here we still have our MCE information safe on current stack. We use per cpu buffer to save high level MCE information. Each per cpu buffer is an array of machine check event structure indexed by per cpu counter mce_nest_count. The mce_nest_count is incremented every time we enter machine check early handler in real mode to get the current free slot (index = mce_nest_count - 1). The mce_nest_count is decremented once the MCE info is consumed by virtual mode machine exception handler. This patch provides save_mce_event(), get_mce_event() and release_mce_event() generic routines that can be used by machine check handlers to populate and retrieve the event. The routine release_mce_event() will free the event slot so that it can be reused. Caller can invoke get_mce_event() with a release flag either to release the event slot immediately OR keep it so that it can be fetched again. The event slot can be also released anytime by invoking release_mce_event(). This patch also updates kvm code to invoke get_mce_event to retrieve generic mce event rather than paca->opal_mce_evt. The KVM code always calls get_mce_event() with release flags set to false so that event is available for linus host machine If machine check occurs while we are in guest, KVM tries to handle the error. If KVM is able to handle MC error successfully, it enters the guest and delivers the machine check to guest. If KVM is not able to handle MC error, it exists the guest and passes the control to linux host machine check handler which then logs MC event and decides how to handle it in linux host. In failure case, KVM needs to make sure that the MC event is available for linux host to consume. Hence KVM always calls get_mce_event() with release flags set to false and later it invokes release_mce_event() only if it succeeds to handle error. Signed-off-by:
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Mahesh Salgaonkar authored
This patch handles the memory errors on power8. If we get a machine check exception due to SLB or TLB errors, then flush SLBs/TLBs and reload SLBs to recover. Signed-off-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
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Mahesh Salgaonkar authored
If we get a machine check exception due to SLB or TLB errors, then flush SLBs/TLBs and reload SLBs to recover. We do this in real mode before turning on MMU. Otherwise we would run into nested machine checks. If we get a machine check when we are in guest, then just flush the SLBs and continue. This patch handles errors for power7. The next patch will handle errors for power8 Signed-off-by:
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Mahesh Salgaonkar authored
This patch introduces flush_tlb operation in cpu_spec structure. This will help us to invoke appropriate CPU-side flush tlb routine. This patch adds the foundation to invoke CPU specific flush routine for respective architectures. Currently this patch introduce flush_tlb for p7 and p8. Signed-off-by:
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Mahesh Salgaonkar authored
This patch adds the early machine check function pointer in cputable for CPU specific early machine check handling. The early machine handle routine will be called in real mode to handle SLB and TLB errors. We can not reuse the existing machine_check hook because it is always invoked in kernel virtual mode and we would already be in trouble if we get SLB or TLB errors. This patch just sets up a mechanism to invoke CPU specific handler. The subsequent patches will populate the function pointer. Signed-off-by:
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Mahesh Salgaonkar authored
We can get machine checks from any context. We need to make sure that we handle all of them correctly. If we are coming from hypervisor user-space, we can continue in host kernel in virtual mode to deliver the MC event. If we got woken up from power-saving mode then we may come in with one of the following state: a. No state loss b. Supervisor state loss c. Hypervisor state loss For (a) and (b), we go back to nap again. State (c) is fatal, keep spinning. For all other context which we not sure of queue up the MCE event and return from the interrupt. Signed-off-by:
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Mahesh Salgaonkar authored
Move machine check entry point into Linux. So far we were dependent on firmware to decode MCE error details and handover the high level info to OS. This patch introduces early machine check routine that saves the MCE information (srr1, srr0, dar and dsisr) to the emergency stack. We allocate stack frame on emergency stack and set the r1 accordingly. This allows us to be prepared to take another exception without loosing context. One thing to note here that, if we get another machine check while ME bit is off then we risk a checkstop. Hence we restrict ourselves to save only MCE information and register saved on PACA_EXMC save are before we turn the ME bit on. We use paca->in_mce flag to differentiate between first entry and nested machine check entry which helps proper use of emergency stack. We increment paca->in_mce every time we enter in early machine check handler and decrement it while leaving. When we enter machine check early handler first time (paca->in_mce == 0), we are sure nobody is using MC emergency stack and allocate a stack frame at the start of the emergency stack. During subsequent entry (paca->in_mce > 0), we know that r1 points inside emergency stack and we allocate separate stack frame accordingly. This prevents us from clobbering MCE information during nested machine checks. The early machine check handler changes are placed under CPU_FTR_HVMODE section. This makes sure that the early machine check handler will get executed only in hypervisor kernel. This is the code flow: Machine Check Interrupt | V 0x200 vector ME=0, IR=0, DR=0 | V +-----------------------------------------------+ |machine_check_pSeries_early: | ME=0, IR=0, DR=0 | Alloc frame on emergency stack | | Save srr1, srr0, dar and dsisr on stack | +-----------------------------------------------+ | (ME=1, IR=0, DR=0, RFID) | V machine_check_handle_early ME=1, IR=0, DR=0 | V +-----------------------------------------------+ | machine_check_early (r3=pt_regs) | ME=1, IR=0, DR=0 | Things to do: (in next patches) | | Flush SLB for SLB errors | | Flush TLB for TLB errors | | Decode and save MCE info | +-----------------------------------------------+ | (Fall through existing exception handler routine.) | V machine_check_pSerie ME=1, IR=0, DR=0 | (ME=1, IR=1, DR=1, RFID) | V machine_check_common ME=1, IR=1, DR=1 . . . Signed-off-by:
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Mahesh Salgaonkar authored
This patch introduces exclusive emergency stack for machine check exception. We use emergency stack to handle machine check exception so that we can save MCE information (srr1, srr0, dar and dsisr) before turning on ME bit and be ready for re-entrancy. This helps us to prevent clobbering of MCE information in case of nested machine checks. The reason for using emergency stack over normal kernel stack is that the machine check might occur in the middle of setting up a stack frame which may result into improper use of kernel stack. Signed-off-by:
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Mahesh Salgaonkar authored
This patch splits the common exception prolog logic into three parts to facilitate reuse of existing code in the next patch. This patch also re-arranges few instructions in such a way that the second part now deals with saving register values from paca save area to stack frame, and the third part deals with saving current register values to stack frame. The second and third part will be reused in the machine check exception routine in the subsequent patch. Please note that this patch does not introduce or change existing code logic. Instead it is just a code movement and instruction re-ordering. Patch Acked-by Paul. But made some minor modification (explained above) to address Paul's comment in the later patch(3). Signed-off-by:
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- 02 Dec, 2013 12 commits
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Michael Ellerman authored
We currently have a user visible CONFIG_POWERNV_MSI option, but it doesn't actually disable MSI for powernv. The MSI code is always built, what it does disable is the inclusion of the MSI bitmap code, which leads to a build error. eg, with PPC_POWERNV=y and POWERNV_MSI=n we get: arch/powerpc/platforms/built-in.o: In function `.pnv_teardown_msi_irqs': pci.c:(.text+0x3558): undefined reference to `.msi_bitmap_free_hwirqs' We don't really need a POWERNV_MSI symbol, just have the MSI bitmap code depend directly on PPC_POWERNV. Signed-off-by:
Michael Ellerman <michael@ellerman.id.au> Reviewed-by:
Gavin Shan <shangw@linux.vnet.ibm.com> Signed-off-by:
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Michael Ellerman authored
Previously PSERIES_MSI depended on PPC_PSERIES via EEH. However in commit 317f06de "powerpc/eeh: Move common part to kernel directory" we made CONFIG_EEH selectable on POWERNV. That leaves us with PSERIES_MSI being live even when PSERIES=n. Fix it by making PSERIES_MSI depend directly on PPC_PSERIES. Signed-off-by:
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Madhavan Srinivasan authored
Currently PMC (Performance Monitor Counter) setup macros are used for other SPRs. Since not all SPRs are PMC related, this patch modifies the exisiting macro and uses it to setup both PMC and non PMC SPRs accordingly. Signed-off-by:
Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Acked-by:
Olof Johansson <olof@lixom.net> Acked-by:
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fan.du authored
Current irq_stat.timers_irqs counting doesn't discriminate timer event handler and other timer interrupt(like arch_irq_work_raise). Sometimes we need to know exactly how much interrupts timer event handler fired, so let's be more specific on this. Signed-off-by:
Fan Du <fan.du@windriver.com> Signed-off-by:
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Kevin Hao authored
As Benjamin Herrenschmidt has indicated, we still need a dummy icbi to purge all the prefetched instructions from the ifetch buffers for the snooping icache. We also need a sync before the icbi to order the actual stores to memory that might have modified instructions with the icbi. Signed-off-by:
Kevin Hao <haokexin@gmail.com> Signed-off-by:
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Chen Gang authored
Since not need 'max_cpus' after the related commit, the related code are useless too, need be removed. The related commit: c1aa687d powerpc: Clean up obsolete code relating to decrementer and timebase The related warning: arch/powerpc/kernel/smp.c:323:43: warning: parameter ‘max_cpus’ set but not used [-Wunused-but-set-parameter] Signed-off-by:
Chen Gang <gang.chen@asianux.com> Reviewed-by:
Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Signed-off-by:
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Ian Campbell authored
Signed-off-by:
Ian Campbell <ian.campbell@citrix.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Signed-off-by:
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Ian Campbell authored
This fixes a warning: DTC arch/powerpc/boot/virtex440-ml507.dtb Warning (reg_format): "reg" property in /plb@0/xps-ll-temac@81c00000/ethernet@81c00000/phy@7 has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1) Warning (avoid_default_addr_size): Relying on default #address-cells value for /plb@0/xps-ll-temac@81c00000/ethernet@81c00000/phy@7 Warning (avoid_default_addr_size): Relying on default #size-cells value for /plb@0/xps-ll-temac@81c00000/ethernet@81c00000/phy@7 Signed-off-by:
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Ian Campbell authored
Currently I see: DTC arch/powerpc/boot/kilauea.dtb Warning (reg_format): "reg" property in /plb/ppc4xx-msi@C10000000 has invalid length (12 bytes) (#address-cells == 1, #size-cells == 1) It appears that unlike the other platforms handled by 3fb79338 "powerpc/4xx: Adding PCIe MSI support" this platform does not use address-cells=2. Signed-off-by:
Josh Boyer <jwboyer@gmail.com> Cc: Rupjyoti Sarmah <rsarmah@apm.com> Cc: Tirumala R Marri <tmarri@apm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND...) Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Signed-off-by:
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Kevin Hao authored
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Kevin Hao authored
So that it can be used by other codes. No function change. Signed-off-by:
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Denis Efremov authored
EXPORT_SYMBOL and inline directives are contradictory to each other. The patch fixes this inconsistency. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by:
Denis Efremov <yefremov.denis@gmail.com> Acked-by:
Geoff Levand <geoff@infradead.org> Signed-off-by:
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- 27 Nov, 2013 1 commit
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Benjamin Herrenschmidt authored
We are missing building windfarm_max6690_sensor.o when building CONFIG_WINDFARM_RM31. Usually all the windfarm drivers are built and thus this isn't a problem but some more "tailored" setups (Gentoo ?) building only that driver are not working because the require sensor module is missing. Reported-by:
Stanislav Ponomarev <devhexorg@gmail.com> Signed-off-by:
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- 25 Nov, 2013 5 commits
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Chen Gang authored
for tmp_part->header.name: it is "Terminating null required only for names < 12 chars". so need to limit the %.12s for it in printk additional info: %12s limit the width, not for the original string output length if name length is more than 12, it still can be fully displayed. if name length is less than 12, the ' ' will be filled before name. %.12s truly limit the original string output length (precision) Signed-off-by: -
Michael Neuling authored
In a recent patch: commit c13f20ac Author: Michael Neuling <mikey@neuling.org> powerpc/signals: Mark VSX not saved with small contexts We fixed an issue but an improved solution was later discussed after the patch was merged. Firstly, this patch doesn't handle the 64bit signals case, which could also hit this issue (but has never been reported). Secondly, the original patch isn't clear what MSR VSX should be set to. The new approach below always clears the MSR VSX bit (to indicate no VSX is in the context) and sets it only in the specific case where VSX is available (ie. when VSX has been used and the signal context passed has space to provide the state). This reverts the original patch and replaces it with the improved solution. It also adds a 64 bit version. Signed-off-by:
Michael Neuling <mikey@neuling.org> Cc: stable@vger.kernel.org Signed-off-by:
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Hari Bathini authored
When CONFIG_SPARSEMEM_VMEMMAP option is used in kernel, makedumpfile fails to filter vmcore dump as it fails to do vmemmap translations. So far dump filtering on ppc64 never had to deal with vmemmap addresses seperately as vmemmap regions where mapped in zone normal. But with the inclusion of CONFIG_SPARSEMEM_VMEMMAP config option in kernel, this vmemmap address translation support becomes necessary for dump filtering. For vmemmap adress translation, few kernel symbols are needed by dump filtering tool. This patch adds those symbols to vmcoreinfo, which a dump filtering tool can use for filtering the kernel dump. Tested this changes successfully with makedumpfile tool that supports vmemmap to physical address translation outside zone normal. [ Removed unneeded #ifdef as suggested by Michael Ellerman --BenH ] Signed-off-by:
Hari Bathini <hbathini@linux.vnet.ibm.com> Signed-off-by:
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Anton Blanchard authored
Stephen reported a failure in an allyesconfig build. CONFIG_CPU_LITTLE_ENDIAN=y gets set but his toolchain is not new enough to support little endian. We really want to default to a big endian build; Ben suggested using a choice which defaults to CPU_BIG_ENDIAN. Signed-off-by:
Anton Blanchard <anton@samba.org> Signed-off-by:
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Michael Neuling authored
Currently if I cross build TAGS or cscope from x86 I get this: % make ARCH=powerpc TAGS gcc-4.8.real: error: unrecognized command line option ‘-mbig-endian’ GEN TAGS % I'm not setting CROSS_COMPILE= as logically I shouldn't need to and I haven't needed to in the past when building TAGS or cscope. Also, the above completess correct as the error is not fatal to the build. This was caused by: commit d72b0801 Author: Ian Munsie <imunsie@au1.ibm.com> powerpc: Add ability to build little endian kernels The below fixes this by testing for the -mbig-endian option before adding it. I've not done the same thing in the little endian case as if -mlittle-endian doesn't exist, we probably want to fail quickly as you probably have an old big endian compiler. Signed-off-by:
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- 24 Nov, 2013 1 commit
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Benjamin Herrenschmidt authored
Scott wrote: << The corenet64 patch fixes a regression introduced in 3.13-rc1 (commit ef1313de, "powerpc: Add VMX optimised xor for RAID5"). The 8xx patch fixes a regression introduced in 3.12 (commit beb2dc0a, "powerpc: Convert some mftb/mftbu into mfspr"). The other two patches are fixes for minor, long standing bugs. >>
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- 22 Nov, 2013 10 commits
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Scott Wood authored
And in flush_hugetlb_page(), don't check whether vma is NULL after we've already dereferenced it. This was found by Dan using static analysis as described here: https://lists.ozlabs.org/pipermail/linuxppc-dev/2013-November/113161.html We currently get away with this because the callers that currently pass NULL for vma seem to be 32-bit-only (e.g. highmem, and CONFIG_DEBUG_PGALLOC in pgtable_32.c) Hugetlb is currently 64-bit only, so we never saw a NULL vma here. Signed-off-by:
Scott Wood <scottwood@freescale.com> Reported-by:
Dan Carpenter <dan.carpenter@oracle.com>
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Adam Borowski authored
These lines were inoperative for four years, which puts some doubt into their importance, and it's possible the fixed version will regress, but at the very least they should be removed instead. Signed-off-by:
Adam Borowski <kilobyte@angband.pl> Signed-off-by:
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LEROY Christophe authored
Commit beb2dc0a breaks the MPC8xx which seems to not support using mfspr SPRN_TBRx instead of mftb/mftbu despite what is written in the reference manual. This patch reverts to the use of mftb/mftbu when CONFIG_8xx is selected. Signed-off-by:
Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by:
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Tiejun Chen authored
If CONFIG_ALTIVEC is enabled for CoreNet64, and if we also select CONFIG_E{5,6}500_CPU this may introduce -mcpu=e500mc64 into $CFLAGS. But Altivec option not allowed with e500mc64, then some compiling errors occur like this: CC arch/powerpc/lib/xor_vmx.o arch/powerpc/lib/xor_vmx.c:1:0: error: AltiVec not supported in this target make[1]: *** [arch/powerpc/lib/xor_vmx.o] Error 1 make: *** [arch/powerpc/lib] Error 2 So we should restrict e500mc64 in altivec scenario. Signed-off-by:Tiejun Chen <tiejun.chen@windriver.com> Signed-off-by:
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Linus Torvalds authored
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Linus Torvalds authored
Merge tag 'ecryptfs-3.13-rc1-quiet-checkers' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs Pull minor eCryptfs fix from Tyler Hicks: "Quiet static checkers by removing unneeded conditionals" * tag 'ecryptfs-3.13-rc1-quiet-checkers' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs: eCryptfs: file->private_data is always valid
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git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/soundLinus Torvalds authored
Pull second set of sound fixes from Takashi Iwai: "A collection of small fixes in HD-audio quirks and runtime PM, ASoC rcar, abs8500 and other codecs. Most of commits are for stable kernels, too" * tag 'sound-fix2-3.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: ALSA: hda - Set current_headset_type to ALC_HEADSET_TYPE_ENUM (janitorial) ALSA: hda - Provide missing pin configs for VAIO with ALC260 ALSA: hda - Add headset quirk for Dell Inspiron 3135 ALSA: hda - Fix the headphone jack detection on Sony VAIO TX ALSA: hda - Fix missing bass speaker on ASUS N550 ALSA: hda - Fix unbalanced runtime PM notification at resume ASoC: arizona: Set FLL to free-run before disabling ALSA: hda - A casual Dell Headset quirk ASoC: rcar: fixup dma_async_issue_pending() timing ASoC: rcar: off by one in rsnd_scu_set_route() ASoC: wm5110: Add post SYSCLK register patch for rev D chip ASoC: ab8500: Revert to using custom I/O functions ALSA: hda - Also enable mute/micmute LED control for "Lenovo dock" fixup ALSA: firewire-lib: include sound/asound.h to refer to snd_pcm_format_t ALSA: hda - Select FW_LOADER from CONFIG_SND_HDA_CODEC_CA0132_DSP ALSA: hda - Enable mute/mic-mute LEDs for more Thinkpads with Realtek codec ASoC: rcar: fixup mod access before checking
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git://people.freedesktop.org/~airlied/linuxLinus Torvalds authored
Pull DRM fixes from Dave Airlie: "I was going to leave this until post -rc1 but sysfs fixes broke hotplug in userspace, so I had to fix it harder, otherwise a set of pulls from intel, radeon and vmware, The vmware/ttm changes are bit larger but since its early and they are unlikely to break anything else I put them in, it lets vmware work with dri3" * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: (36 commits) drm/sysfs: fix hotplug regression since lifetime changes drm/exynos: g2d: fix memory leak to userptr drm/i915: Fix gen3 self-refresh watermarks drm/ttm: Remove set_need_resched from the ttm fault handler drm/ttm: Don't move non-existing data drm/radeon: hook up backlight functions for CI and KV family. drm/i915: Replicate BIOS eDP bpp clamping hack for hsw drm/i915: Do not enable package C8 on unsupported hardware drm/i915: Hold pc8 lock around toggling pc8.gpu_idle drm/i915: encoder->get_config is no longer optional drm/i915/tv: add ->get_config callback drm/radeon/cik: Add macrotile mode array query drm/radeon/cik: Return backend map information to userspace drm/vmwgfx: Make vmwgfx dma buffers prime aware drm/vmwgfx: Make surfaces prime-aware drm/vmwgfx: Hook up the prime ioctls drm/ttm: Add a minimal prime implementation for ttm base objects drm/vmwgfx: Fix false lockdep warning drm/ttm: Allow execbuf util reserves without ticket drm/i915: restore the early forcewake cleanup ...
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git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pciLinus Torvalds authored
Pull PCI updates from Bjorn Helgaas: "Miscellaneous - Remove duplicate disable from pcie_portdrv_remove() (Yinghai Lu) - Fix whitespace, capitalization, and spelling errors (Bjorn Helgaas)" * tag 'pci-v3.13-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: PCI: Remove duplicate pci_disable_device() from pcie_portdrv_remove() PCI: Fix whitespace, capitalization, and spelling errors
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git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pendingLinus Torvalds authored
Pull SCSI target updates from Nicholas Bellinger: "Things have been quiet this round with mostly bugfixes, percpu conversions, and other minor iscsi-target conformance testing changes. The highlights include: - Add demo_mode_discovery attribute for iscsi-target (Thomas) - Convert tcm_fc(FCoE) to use percpu-ida pre-allocation - Add send completion interrupt coalescing for ib_isert - Convert target-core to use percpu-refcounting for se_lun - Fix mutex_trylock usage bug in iscsit_increment_maxcmdsn - tcm_loop updates (Hannes) - target-core ALUA cleanups + prep for v3.14 SCSI Referrals support (Hannes) v3.14 is currently shaping to be a busy development cycle in target land, with initial support for T10 Referrals and T10 DIF currently on the roadmap" * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (40 commits) iscsi-target: chap auth shouldn't match username with trailing garbage iscsi-target: fix extract_param to handle buffer length corner case iscsi-target: Expose default_erl as TPG attribute target_core_configfs: split up ALUA supported states target_core_alua: Make supported states configurable target_core_alua: Store supported ALUA states target_core_alua: Rename ALUA_ACCESS_STATE_OPTIMIZED target_core_alua: spellcheck target core: rename (ex,im)plict -> (ex,im)plicit percpu-refcount: Add percpu-refcount.o to obj-y iscsi-target: Do not reject non-immediate CmdSNs exceeding MaxCmdSN iscsi-target: Convert iscsi_session statistics to atomic_long_t target: Convert se_device statistics to atomic_long_t target: Fix delayed Task Aborted Status (TAS) handling bug iscsi-target: Reject unsupported multi PDU text command sequence ib_isert: Avoid duplicate iscsit_increment_maxcmdsn call iscsi-target: Fix mutex_trylock usage in iscsit_increment_maxcmdsn target: Core does not need blkdev.h target: Pass through I/O topology for block backstores iser-target: Avoid using FRMR for single dma entry requests ...
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