- 03 Jun, 2015 25 commits
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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:
Michael Neuling <mikey@neuling.org> Acked-by:
Ian Munsie <imunsie@au1.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
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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 15 commits
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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: -
Cyril Bur authored
Rather than continuing to maintain a copy of pseries_defconfig with CONFIG_CPU_LITTLE_ENDIAN enabled, use the generic merge_config script and use an le.config to enable little endian on top of pseries_defconfig without the need for a duplicated _defconfig file. This method will require less maintenance in the future and will ensure that both 'defconfigs' are always in sync. It is worth noting that the seemingly more simple approach of: pseries_le_defconfig: pseries_defconfig $(Q)$(MAKE) le.config Will not work when building using O=builddir. The obvious fix to that: pseries_le_defconfig: $(Q)$(MAKE) -f $(srctree)/Makefile pseries_defconfig le.config Also does not work. This is because if we have for example: config FOO depends on CPU_BIG_ENDIAN select BAR Then BAR will be enabled by the first call to kconfig (via pseries_defconfig), and then will remain enabled after we merge le.config, even though FOO will have been turned off. The solution is to ensure to only invoke the kconfig logic once, after we have merged all the config fragments. This ensures nothing is select'ed on that should then be disabled by the later merged configs. This is done through the explicit call to make olddefconfig Signed-off-by:
Cyril Bur <cyrilbur@gmail.com> Reviewed-by:
Samuel Mendoza-Jonas <sam.mj@au1.ibm.com> [mpe: Massage change log, fix white space and use ARCH not SRCARCH] Signed-off-by:
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Cyril Bur authored
These two configs should be identical with the exception of big or little endian. The big endian version has XMON_DEFAULT turned on while the little endian has XMON_DEFAULT not set. It makes the most sense for defconfigs not to use xmon by default, production systems should get back up as quickly as possible, not sit in xmon. In the event debugging is required, the option can be enabled or xmon=on can be specified on commandline. Signed-off-by:
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Jiang Liu authored
Use irq_desc_get_xxx() to avoid redundant lookup of irq_desc while we already have a pointer to corresponding irq_desc. Signed-off-by:
Jiang Liu <jiang.liu@linux.intel.com> Signed-off-by:
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Anton Blanchard authored
We need to use a trampoline when using LOAD_HANDLER(), because the destination needs to be in the first 64kB. An absolute branch has no such limitations, so just jump there. Signed-off-by:
Anton Blanchard <anton@samba.org> Signed-off-by:
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Anton Blanchard authored
We had some code to restore the LR in the relocatable system call path back when we used the LR to do an indirect branch. Commit 6a404806 ("powerpc: Avoid link stack corruption in MMU on syscall entry path") changed this to use the CTR which is volatile across system calls so does not need restoring. Remove the stale comment and the restore of the LR. Signed-off-by:
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Anton Blanchard authored
When we take a PMU exception or a software event we call perf_read_regs(). This overloads regs->result with a boolean that describes if we should use the sampled instruction address register (SIAR) or the regs. If the exception is in kernel, we start with the kernel regs and backtrace through the kernel stack. At this point we switch to the userspace regs and backtrace the user stack with perf_callchain_user(). Unfortunately these regs have not got the perf_read_regs() treatment, so regs->result could be anything. If it is non zero, perf_instruction_pointer() decides to use the SIAR, and we get issues like this: 0.11% qemu-system-ppc [kernel.kallsyms] [k] _raw_spin_lock_irqsave | ---_raw_spin_lock_irqsave | |--52.35%-- 0 | | | |--46.39%-- __hrtimer_start_range_ns | | kvmppc_run_core | | kvmppc_vcpu_run_hv | | kvmppc_vcpu_run | | kvm_arch_vcpu_ioctl_run | | kvm_vcpu_ioctl | | do_vfs_ioctl | | sys_ioctl | | system_call | | | | | |--67.08%-- _raw_spin_lock_irqsave <--- hi mum | | | | | | | --100.00%-- 0x7e714 | | | 0x7e714 Notice the bogus _raw_spin_irqsave when we transition from kernel (system_call) to userspace (0x7e714). We inserted what was in the SIAR. Add a check in regs_use_siar() to check that the regs in question are from a PMU exception. With this fix the backtrace makes sense: 0.47% qemu-system-ppc [kernel.vmlinux] [k] _raw_spin_lock_irqsave | ---_raw_spin_lock_irqsave | |--53.83%-- 0 | | | |--44.73%-- hrtimer_try_to_cancel | | kvmppc_start_thread | | kvmppc_run_core | | kvmppc_vcpu_run_hv | | kvmppc_vcpu_run | | kvm_arch_vcpu_ioctl_run | | kvm_vcpu_ioctl | | do_vfs_ioctl | | sys_ioctl | | system_call | | __ioctl | | 0x7e714 | | 0x7e714 Cc: stable@vger.kernel.org Signed-off-by: -
Michael Ellerman authored
If both STRICT_MM_TYPECHECKS and DEBUG_PAGEALLOC are enabled, the code in kernel_map_linear_page() is built, and so we fail with: arch/powerpc/mm/hash_utils_64.c:1478:2: error: incompatible type for argument 1 of 'htab_convert_pte_flags' Fix it by using pgprot_val(). Reported-by:
Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by:
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Daniel Axtens authored
Previously, dma_set_mask() on powernv was convoluted: 0) Call dma_set_mask() (a/p/kernel/dma.c) 1) In dma_set_mask(), ppc_md.dma_set_mask() exists, so call it. 2) On powernv, that function pointer is pnv_dma_set_mask(). In pnv_dma_set_mask(), the device is pci, so call pnv_pci_dma_set_mask(). 3) In pnv_pci_dma_set_mask(), call pnv_phb->set_dma_mask() if it exists. 4) It only exists in the ioda case, where it points to pnv_pci_ioda_dma_set_mask(), which is the final function. So the call chain is: dma_set_mask() -> pnv_dma_set_mask() -> pnv_pci_dma_set_mask() -> pnv_pci_ioda_dma_set_mask() Both ppc_md and pnv_phb function pointers are used. Rip out the ppc_md call, pnv_dma_set_mask() and pnv_pci_dma_set_mask(). Instead: 0) Call dma_set_mask() (a/p/kernel/dma.c) 1) In dma_set_mask(), the device is pci, and pci_controller_ops.dma_set_mask() exists, so call pci_controller_ops.dma_set_mask() 2) In the ioda case, that points to pnv_pci_ioda_dma_set_mask(). The new call chain is dma_set_mask() -> pnv_pci_ioda_dma_set_mask() Now only the pci_controller_ops function pointer is used. The fallback paths for p5ioc2 are the same. Previously, pnv_pci_dma_set_mask() would find no pnv_phb->set_dma_mask() function, to it would call __set_dma_mask(). Now, dma_set_mask() finds no ppc_md call or pci_controller_ops call, so it calls __set_dma_mask(). Signed-off-by: -
Daniel Axtens authored
Some systems only need to deal with DMA masks for PCI devices. For these systems, we can avoid the need for a platform hook and instead use a pci controller based hook. Signed-off-by:
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Daniel Axtens authored
Remove powernv generic PCI controller operations. Replace it with controller ops for each of the two supported PHBs. As an added bonus, make the two new structs const, which will help guard against bugs such as the one introduced in 65ebf4b6 ("powerpc/powernv: Move controller ops from ppc_md to controller_ops") Signed-off-by:
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Daniel Axtens authored
Remove unneeded ppc_md functions. Patch callsites to use pci_controller_ops functions exclusively. Signed-off-by:
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Daniel Axtens authored
Move the u3 MPIC msi subsystem to use the pci_controller_ops structure rather than ppc_md for MSI related PCI controller operations. As with fsl_msi, operations are plugged in at the subsys level, after controller creation. Again, we iterate over all controllers and populate them with the MSI ops. Signed-off-by:
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Daniel Axtens authored
Move the PaSemi MPIC msi subsystem to use the pci_controller_ops structure rather than ppc_md for MSI related PCI controller operations. As with fsl_msi, operations are plugged in at the subsys level, after controller creation. Again, we iterate over all controllers and populate them with the MSI ops. Signed-off-by:
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Daniel Axtens authored
Move the ppc4xx hsta msi subsystem to use the pci_controller_ops structure rather than ppc_md for MSI related PCI controller operations. As with fsl_msi, operations are plugged in at the subsys level, after controller creation. Again, we iterate over all controllers and populate them with the MSI ops. Signed-off-by:
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