- 07 Jun, 2015 7 commits
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Anshuman Khandual authored
This patch adds a new documentation file explaining the DSCR support on powerpc platforms. This explains DSCR related data structure, code paths and also available user interfaces. Any further functional changes to the DSCR support in the kernel should definitely update the documentation here. Signed-off-by:
Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
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Anshuman Khandual authored
This patch adds some in-code documentation to the DSCR related code to make it more readable without having any functional change to it. Signed-off-by:
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Anshuman Khandual authored
PACA_DSCR offset macro tracks dscr_default element in the paca structure. Better change the name of this macro to match that of the data element it tracks. Makes the code more readable. Signed-off-by:
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Anshuman Khandual authored
The process context switch code no longer uses dscr_default variable from the sysfs.c file. The variable became unused when we started storing the CPU specific DSCR value in the PACA structure instead. This patch just removes this extern declaration. It was originally added by the following commit. Signed-off-by:
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Anshuman Khandual authored
Currently DSCR (Data Stream Control Register) can be accessed with mfspr or mtspr instructions inside a thread via two different SPR numbers. One being the user accessible problem state SPR number 0x03 and the other being the privilege state SPR number 0x11. All access through the privilege state SPR number get emulated through illegal instruction exception. Any access through the problem state SPR number raises one facility unavailable exception which sets the thread based dscr_inherit bit and enables DSCR facility through FSCR register thus allowing direct access to DSCR without going through this exception in the future. We set the thread.dscr_inherit bit whether the access was with mfspr or mtspr instruction which is neither correct nor does it match the behaviour through the instruction emulation code path driven from privilege state SPR number. User currently observes two different kind of behaviour when accessing the DSCR through these two SPR numbers. This problem can be observed through these two test cases by replacing the privilege state SPR number with the problem state SPR number. (1) http://ozlabs.org/~anton/junkcode/dscr_default_test.c (2) http://ozlabs.org/~anton/junkcode/dscr_explicit_test.c This patch fixes the problem by making sure that the behaviour visible to the user remains the same irrespective of which SPR number is being used. Inside facility unavailable exception, we check whether it was cuased by a mfspr or a mtspr isntrucction. In case of mfspr instruction, just emulate the instruction. In case of mtspr instruction, set the thread based dscr_inherit bit and also enable the facility through FSCR. All user SPR based mfspr instruction will be emulated till one user SPR based mtspr has been executed. Signed-off-by:
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Michael Neuling authored
When we release the device, we should also invalidate the default context. With this cxl_get_context() will return null after removal. Signed-off-by:
Michael Neuling <mikey@neuling.org> Signed-off-by:
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David Gibson authored
Commit 28158cd1 "powerpc/eeh: Enhance pcibios_set_pcie_reset_state()" introduced a fix for a problem where certain configurations could lead to pci_reset_function() destroying the state of PCI devices other than the one specified. Unfortunately, the fix has a trivial bug - it calls pci_save_state() again, when it should be calling pci_restore_state(). This corrects the problem. Cc: Gavin Shan <gwshan@au1.ibm.com> Signed-off-by:
David Gibson <david@gibson.dropbear.id.au> Acked-by:
Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by:
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- 04 Jun, 2015 5 commits
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Jeremy Kerr authored
This change adds a char device to access the "PRD" (processor runtime diagnostics) channel to OPAL firmware. Includes contributions from Vaidyanathan Srinivasan, Neelesh Gupta & Vishal Kulkarni. Signed-off-by:
Neelesh Gupta <neelegup@linux.vnet.ibm.com> Signed-off-by:
Jeremy Kerr <jk@ozlabs.org> Acked-by:
Stewart Smith <stewart@linux.vnet.ibm.com> Signed-off-by:
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Jeremy Kerr authored
The (upcoming) opal-prd driver needs to access the message notifier and xscom code, so add EXPORT_SYMBOL_GPL macros for these. Signed-off-by:
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Jeremy Kerr authored
opal_ipmi_init and opal_flash_init are equivalent, except for the compatbile string. Merge these two into a common opal_pdev_init function. Signed-off-by:
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Anton Blanchard authored
Signed-off-by:
Anton Blanchard <anton@samba.org> Signed-off-by:
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Cédric Le Goater authored
The opal_{get,set}_param calls return internal error codes which need to be translated in errnos in Linux. Signed-off-by:Cédric Le Goater <clg@fr.ibm.com> Signed-off-by:
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- 03 Jun, 2015 27 commits
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Michael Neuling authored
This patch does two things. Firstly it presents the Accelerator Function Unit (AFUs) behind the POWER Service Layer (PSL) as PCI devices on a virtual PCI Host Bridge (vPHB). This in in addition to the PSL being a PCI device itself. As part of the Coherent Accelerator Interface Architecture (CAIA) AFUs can provide an AFU configuration. This AFU configuration recored is architected to be the same as a PCI config space. This patch sets discovers the AFU configuration records, provides AFU config space read/write functions to these configuration records. It then enumerates the PCI bus. It also hooks in PCI ops where appropriate. It also destroys the vPHB when the physical card is removed. Secondly, it add an in kernel API for AFU to use CXL. AFUs must present a driver that firstly binds as a PCI device. This PCI device can then be using to do CXL specific operations (that can't sit in the PCI ops) using this API. Signed-off-by:
Ian Munsie <imunsie@au1.ibm.com> Signed-off-by:
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Michael Neuling authored
The cxl kernel API will allow drivers other than cxl to export a file descriptor which has the same userspace API. These file descriptors will be able to be used against libcxl. This exports those file ops for use by other drivers. Signed-off-by:
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Michael Neuling authored
This moves the current include file from cxl.h -> cxl-base.h. This current include file is used only to pass information between the base driver that needs to be built into the kernel and the cxl module. This is to make way for a new include/misc/cxl.h which will contain just the kernel API for other driver to use Signed-off-by:
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Michael Neuling authored
Cleanup Makefile by fixing line wrapping. Signed-off-by:
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Michael Neuling authored
This reworks contexts lifetimes a bit to enable the kernel API where we may want to reuse contexts. Here we will want to start and stop contexts without freeing them. Start context does the get pid & ctx so stop context will need to do the puts. Here we move put pid & ctx to the detach context path which will become part of the stop context path. Signed-off-by:
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Michael Neuling authored
This updates AFU directed and dedicated modes for contexts attached to the kernel. The SR (similar to the MSR in the core) calculation is getting quite complex and is duplicated in AFU directed and dedicated modes. This patch also merges this SR calculation for these modes. Signed-off-by:
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Michael Neuling authored
Split the afu_register_irqs() function so that different parts can be useful elsewhere. Signed-off-by:
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Michael Neuling authored
We only need to check the pid attached to this context for userspace contexts. Kernel contexts can skip this check. Signed-off-by:
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Michael Neuling authored
Export some symbols which will soon be used elsewhere in this driver. Now they are global we rename them so to avoid collisions. Signed-off-by:
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Michael Neuling authored
Rename cxl_afu_reset() to __cxl_afu_reset() to we can reuse this function name in the API. Signed-off-by:
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Michael Neuling authored
Rework __detach_context() and cxl_context_detach() so we can reuse them in the kernel API. Signed-off-by:
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Michael Neuling authored
Add cookie parameter to afu_release_irqs() so that we can pass in a different cookie than the context structure. This will be useful for other kernel drivers that want to call this but get their own cookie back in the interrupt handler. Update all existing call sites. Signed-off-by:
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Michael Neuling authored
Now that we parse the AFU Configuration record, dump some info on it when in debug mode. Signed-off-by:
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Michael Neuling authored
When probing we call pci_enable_device() but don't call pci_disable_device() on fail. This causes refcounting issues in the PCI subsystem if a second driver tries to bind to the same device. This patch adds the pci_disable_device() to the probe error path. This error path is hit when this cxl driver tries to bind to AFUs (on the vPHB) rather than the physical device. Signed-off-by:
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Ian Munsie authored
When we expose AFUs as virtual PCI devices, they may look like the physical CAPI PCI card. ie they may have the same vendor/device IDs. We want to avoid these AFUs binding to this driver and any init this driver may do. Re-order card init to check the VSEC earlier before assigning BARs or activating CXL. Also change the dev used in early prints as the adapter struct may not be inited at this earlier stage. Signed-off-by:
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Michael Neuling authored
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Michael Neuling authored
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Michael Neuling authored
Now that libcxl is public, let's document it. Signed-off-by:
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Michael Neuling authored
This adds a hook into the powerpc pci code for pci_disable_device() calls. The generic code already provides a weak pcibios_disable_device() symbol, so we just need to provide our own in powerpc and it'll get picked up. This is passed directly to the phb controller ops, provided one exists. Signed-off-by:
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Michael Neuling authored
Currently pnv_pci_shutdown() calls the PHB shutdown code for all PHBs in the system. It dereferences the private_data assuming it's a powernv PHB, which won't be the case when we have different PHB in the systems (like when we add vPHBs for CXL). This moves the shutdown hook to the pci_controller_ops and fixes the call site to use that instead. Signed-off-by:
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Michael Neuling authored
Add cxl context pointer to archdata. We'll want to create one of these for cxl PCI devices. Put them here until we can get a pci_dev specific private data. This location was suggested by benh. Signed-off-by:
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Michael Neuling authored
Add release_device() hook to phb ops so we can clean up for specific phbs. Signed-off-by:
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Daniel Axtens authored
Export pcibios_claim_one_bus, pcibios_scan_phb and pcibios_alloc_controller. These will be used by the CXL driver. Signed-off-by:
Daniel Axtens <dja@axtens.net> Signed-off-by:
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Michael Neuling authored
This fixes calculating the key bits (KP and KS) in the SLB VSID for kernel mappings. I'm not CCing this to stable as there are no uses of this currently. Signed-off-by:
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Ian Munsie authored
The afu fd release path was identified as a significant bottleneck in the overall performance of cxl. While an optimal AFU design would minimise the need to close & reopen the AFU fd, it is not always practical to avoid. The bottleneck seems to be down to the call to synchronize_rcu(), which will block until every other thread is guaranteed to be out of an RCU critical section. Replace it with call_rcu() to free the context structures later so we can return to the application sooner. This reduces the time spent in the fd release path from 13356 usec to 13.3 usec - about a 100x speed up. Reported-by:
Fei K Chen <uchen@cn.ibm.com> Signed-off-by:
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Vaibhav Jain authored
Export the "AFU Error Buffer" via sysfs attribute (afu_err_buf). AFU error buffer is used by the AFU to report application specific errors. The contents of this buffer are AFU specific and are intended to be interpreted by the application interacting with the afu. Suggested-by:
Vaibhav Jain <vaibhav@linux.vnet.ibm.com> Signed-off-by:
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Vaibhav Jain authored
Given a file descriptor on an afu device, libcxl currently uses the major/minor number obtained from fstat on the fd to construct path to the afu's sysfs directory. However it is possible that rather than using one of the device in /dev/cxl, a kernel driver creates its own device which export generic cxl interface to the userspace. This causes problems with libcxl as it tries to use a wrong major/minor number to construct the sysfs path and fail. So this patch introduces a new ioctl called CXL_IOCTL_GET_AFU_ID on the afu file descriptor to fetch the cxl_afu_id struct that holds the card/offset-id and mode information. These info is then used by libcxl to construct the correct path to the afu sysfs directory. Testing: - Build against pseries be/le configs - Testing with corresponding libcxl changes to verify that it constructs right sysfs path to the afu. Signed-off-by:
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- 02 Jun, 2015 1 commit
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Michael Ellerman authored
These tests were merged in parallel to the install support, update them now to use it. This also adds cross compile support for the VPHN test which was missing it. Signed-off-by:
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