kernel/arch/powerpc/platforms/pseries/hotplug-memory.c, branch linux-4.3.y

powerpc/pseries: use kmemdup rather than duplicating its implementation

2015-08-18T09:34:42Z

The patch was generated using fixed coccinelle semantic patch scripts/coccinelle/api/memdup.cocci [1]. [1]: http://permalink.gmane.org/gmane.linux.kernel/2014320 Signed-off-by: Andrzej Hajda Reviewed-by: Nathan Fontenot Signed-off-by: Michael Ellerman

powerpc/pseries: Fix compile of memory hotplug without CONFIG_MEMORY_HOTREMOVE

2015-04-15T01:55:28Z

51925fb3c5 "powerpc/pseries: Implement memory hotplug remove in the kernel" broke compile when CONFIG_MEMORY_HOTREMOVE is not defined due to missing symbols. This fixes the issue by adding the missing symbols. Signed-off-by: Alexey Kardashevskiy Acked-by: Nathan Fontenot Signed-off-by: Michael Ellerman

powerpc/pseries: Correct memory hotplug locking

2015-04-13T23:26:08Z

Memory dlpar handling can return from dlpar_memory() without releasing the device_hotplug lock. Correct this routine to ensure the lock is released. Fixes: 5f97b2a0d176 ("powerpc/pseries: Implement memory hotplug add in the kernel") Signed-off-by: Nathan Fontenot Signed-off-by: Michael Ellerman

powerpc/pseries: Implement memory hotplug remove in the kernel

2015-03-17T00:03:03Z

This patch adds the ability to do memory hotplug remove in the kernel. Currently the operation to hotplug remove memory is handled by the drmgr command which performs the operation by performing some work in user-space and making requests to the kernel to handle other pieces. By moving all of the work to the kernel we can do the remove faster, and provide a common code path to do memory hotplug for both the PowerVM and PowerKVM environments. Signed-off-by: Nathan Fontenot Signed-off-by: Benjamin Herrenschmidt

powerpc/pseries: Implement memory hotplug add in the kernel

2015-03-17T00:03:01Z

This patch adds the ability to do memory hotplug add in the kernel. Currently the operation to hotplug add memory is handled by the drmgr command which performs the operation by performing some work in user-space and making requests to the kernel to handle other pieces. By moving all of the work to the kernel we can do the add faster, and provide a common code path to do memory hotplug for both the PowerVM and PowerKVM environments. Signed-off-by: Nathan Fontenot Signed-off-by: Benjamin Herrenschmidt

powerpc/pseries: Create new device hotplug entry point

2015-03-17T00:02:58Z

The current hotplug (or dlpar) of devices (the process is generally the same for memory, cpu, and pci) on PowerVM systems is initiated from the HMC, which communicates the request to the partitions through the RSCT framework. The RSCT framework then invokes the drmgr command. The drmgr command performs the hotplug operation by doing some pieces, such as most of the rtas calls and device tree parsing, in userspace and make requests to the kernel to online/offline the device, update the device tree and add/remove the device. For PowerKVM the approach for device hotplug is to follow what is currently being done for pci hotplug. A hotplug request is initiated from the host. QEMU then generates an EPOW interrupt to the guest which causes the guest to make the rtas,check-exception call. In QEMU, the rtas,check-exception call returns a rtas hotplug event to the guest. Please note that the current pci hotplug path for PowerKVM involves the kernel receiving the rtas hotplug event, passing it to rtas_errd in userspace, and having rtas_errd invoke drmgr. The drmgr command then handles the request as described above for PowerVM systems. There is no need for this circuitous route, we should just handle the entire hotplug of devices in the kernel. What I am planning is to enable this by moving the code to handle hotplug from drmgr into the kernel to provide a single path for handling device hotplug for both PowerVM and PowerKVM systems. This patch provides the common iframework and entry point. For PowerKVM a future update to the kernel rtas code will recognize rtas hotplug events returned from rtas,check-exception calls and use the common entry point to handle hotplug of the device. For PowerVM systems, This patch creates /sys/kernel/dlpar that can be used by the drmgr command to initiate hotplug requests. In order to do this a string of the format " " is written to this file. The string consists of a resource (cpu, memory, pci, phb), an action (add or remove), an id_type (count, drc index, drc name), and the corresponding id. The kernel will parse the string and create a rtas hotplug section that can be passed to the common entry point for handling hotplug requests. It should be noted that there is no chance of updating how we receive hotplug (dlpar) requests from the HMC on PowerVM systems. Signed-off-by: Nathan Fontenot Signed-off-by: Benjamin Herrenschmidt

Merge tag 'powerpc-3.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux

2014-12-12T01:48:14Z

Pull powerpc updates from Michael Ellerman: "Some nice cleanups like removing bootmem, and removal of __get_cpu_var(). There is one patch to mm/gup.c. This is the generic GUP implementation, but is only used by us and arm(64). We have an ack from Steve Capper, and although we didn't get an ack from Andrew he told us to take the patch through the powerpc tree. There's one cxl patch. This is in drivers/misc, but Greg said he was happy for us to manage fixes for it. There is an infrastructure patch to support an IPMI driver for OPAL. There is also an RTC driver for OPAL. We weren't able to get any response from the RTC maintainer, Alessandro Zummo, so in the end we just merged the driver. The usual batch of Freescale updates from Scott" * tag 'powerpc-3.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux: (101 commits) powerpc/powernv: Return to cpu offline loop when finished in KVM guest powerpc/book3s: Fix partial invalidation of TLBs in MCE code. powerpc/mm: don't do tlbie for updatepp request with NO HPTE fault powerpc/xmon: Cleanup the breakpoint flags powerpc/xmon: Enable HW instruction breakpoint on POWER8 powerpc/mm/thp: Use tlbiel if possible powerpc/mm/thp: Remove code duplication powerpc/mm/hugetlb: Sanity check gigantic hugepage count powerpc/oprofile: Disable pagefaults during user stack read powerpc/mm: Check for matching hpte without taking hpte lock powerpc: Drop useless warning in eeh_init() powerpc/powernv: Cleanup unused MCE definitions/declarations. powerpc/eeh: Dump PHB diag-data early powerpc/eeh: Recover EEH error on ownership change for BCM5719 powerpc/eeh: Set EEH_PE_RESET on PE reset powerpc/eeh: Refactor eeh_reset_pe() powerpc: Remove more traces of bootmem powerpc/pseries: Initialise nvram_pstore_info's buf_lock cxl: Name interrupts in /proc/interrupt cxl: Return error to PSL if IRQ demultiplexing fails & print clearer warning ...

of/reconfig: Always use the same structure for notifiers

2014-11-24T22:25:03Z

The OF_RECONFIG notifier callback uses a different structure depending on whether it is a node change or a property change. This is silly, and not very safe. Rework the code to use the same data structure regardless of the type of notifier. Signed-off-by: Grant Likely Cc: Benjamin Herrenschmidt Cc: Rob Herring Cc: Pantelis Antoniou Cc:

powerpc: Remove ppc_md.remove_memory

2014-11-05T10:00:46Z

We have an extra level of indirection on memory hot remove which is not matched on memory hot add. Memory hotplug is book3s only, so there is no need for it. This also enables means remove_memory() (ie memory hot unplug) works on powernv. Signed-off-by: Anton Blanchard Signed-off-by: Michael Ellerman

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux

2014-10-12T00:34:00Z

Pull powerpc updates from Michael Ellerman: "Here's a first pull request for powerpc updates for 3.18. The bulk of the additions are for the "cxl" driver, for IBM's Coherent Accelerator Processor Interface (CAPI). Most of it's in drivers/misc, which Greg & Arnd maintain, Greg said he was happy for us to take it through our tree. There's the usual minor cleanups and fixes, including a bit of noise in drivers from some of those. A bunch of updates to our EEH code, which has been getting more testing. Several nice speedups from Anton, including 20% in clear_page(). And a bunch of updates for freescale from Scott" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux: (130 commits) cxl: Fix afu_read() not doing finish_wait() on signal or non-blocking cxl: Add documentation for userspace APIs cxl: Add driver to Kbuild and Makefiles cxl: Add userspace header file cxl: Driver code for powernv PCIe based cards for userspace access cxl: Add base builtin support powerpc/mm: Add hooks for cxl powerpc/opal: Add PHB to cxl mode call powerpc/mm: Add new hash_page_mm() powerpc/powerpc: Add new PCIe functions for allocating cxl interrupts cxl: Add new header for call backs and structs powerpc/powernv: Split out set MSI IRQ chip code powerpc/mm: Export mmu_kernel_ssize and mmu_linear_psize powerpc/msi: Improve IRQ bitmap allocator powerpc/cell: Make spu_flush_all_slbs() generic powerpc/cell: Move data segment faulting code out of cell platform powerpc/cell: Move spu_handle_mm_fault() out of cell platform powerpc/pseries: Use new defines when calling H_SET_MODE powerpc: Update contact info in Documentation files powerpc/perf/hv-24x7: Simplify catalog_read() ...