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* xen: do not map the same GSI twice in PVHVM guests.Stefano Stabellini2012-05-211-0/+4
| | | | | | | | | | | | | | | | | | PV on HVM guests map GSIs into event channels. At restore time the event channels are resumed by restore_pirqs. Device drivers might try to register the same GSI again through ACPI at restore time, but the GSI has already been mapped and bound by restore_pirqs. This patch detects these situations and avoids mapping the same GSI multiple times. Without this patch we get: (XEN) irq.c:2235: dom4: pirq 23 or emuirq 28 already mapped and waste a pirq. CC: stable@kernel.org Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* Merge tag 'stable/for-linus-3.4-tag' of ↵Linus Torvalds2012-03-221-0/+27
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen Pull xen updates from Konrad Rzeszutek Wilk: "which has three neat features: - PV multiconsole support, so that there can be hvc1, hvc2, etc; This can be used in HVM and in PV mode. - P-state and C-state power management driver that uploads said power management data to the hypervisor. It also inhibits cpufreq scaling drivers to load so that only the hypervisor can make power management decisions - fixing a weird perf bug. There is one thing in the Kconfig that you won't like: "default y if (X86_ACPI_CPUFREQ = y || X86_POWERNOW_K8 = y)" (note, that it all depends on CONFIG_XEN which depends on CONFIG_PARAVIRT which by default is off). I've a fix to convert that boolean expression into "default m" which I am going to post after the cpufreq git pull - as the two patches to make this work depend on a fix in Dave Jones's tree. - Function Level Reset (FLR) support in the Xen PCI backend. Fixes: - Kconfig dependencies for Xen PV keyboard and video - Compile warnings and constify fixes - Change over to use percpu_xxx instead of this_cpu_xxx" Fix up trivial conflicts in drivers/tty/hvc/hvc_xen.c due to changes to a removed commit. * tag 'stable/for-linus-3.4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: xen kconfig: relax INPUT_XEN_KBDDEV_FRONTEND deps xen/acpi-processor: C and P-state driver that uploads said data to hypervisor. xen: constify all instances of "struct attribute_group" xen/xenbus: ignore console/0 hvc_xen: introduce HVC_XEN_FRONTEND hvc_xen: implement multiconsole support hvc_xen: support PV on HVM consoles xenbus: don't free other end details too early xen/enlighten: Expose MWAIT and MWAIT_LEAF if hypervisor OKs it. xen/setup/pm/acpi: Remove the call to boot_option_idle_override. xenbus: address compiler warnings xen: use this_cpu_xxx replace percpu_xxx funcs xen/pciback: Support pci_reset_function, aka FLR or D3 support. pci: Introduce __pci_reset_function_locked to be used when holding device_lock. xen: Utilize the restore_msi_irqs hook.
| * xen: Utilize the restore_msi_irqs hook.Tang Liang2012-01-121-0/+27
| | | | | | | | | | | | | | | | to make a hypercall to restore the vectors in the MSI/MSI-X configuration space. Signed-off-by: Tang Liang <liang.tang@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* | xen pvhvm: do not remap pirqs onto evtchns if !xen_have_vector_callbackStefano Stabellini2012-02-031-1/+1
|/ | | | | | CC: stable@kernel.org #2.6.37 and onwards Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
*---. Merge branches 'stable/drivers-3.2', 'stable/drivers.bugfixes-3.2' and ↵Linus Torvalds2011-10-251-3/+19
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 'stable/pci.fixes-3.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen * 'stable/drivers-3.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: xenbus: don't rely on xen_initial_domain to detect local xenstore xenbus: Fix loopback event channel assuming domain 0 xen/pv-on-hvm:kexec: Fix implicit declaration of function 'xen_hvm_domain' xen/pv-on-hvm kexec: add xs_reset_watches to shutdown watches from old kernel xen/pv-on-hvm kexec: update xs_wire.h:xsd_sockmsg_type from xen-unstable xen/pv-on-hvm kexec+kdump: reset PV devices in kexec or crash kernel xen/pv-on-hvm kexec: rebind virqs to existing eventchannel ports xen/pv-on-hvm kexec: prevent crash in xenwatch_thread() when stale watch events arrive * 'stable/drivers.bugfixes-3.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: xen/pciback: Check if the device is found instead of blindly assuming so. xen/pciback: Do not dereference psdev during printk when it is NULL. xen: remove XEN_PLATFORM_PCI config option xen: XEN_PVHVM depends on PCI xen/pciback: double lock typo xen/pciback: use mutex rather than spinlock in vpci backend xen/pciback: Use mutexes when working with Xenbus state transitions. xen/pciback: miscellaneous adjustments xen/pciback: use mutex rather than spinlock in passthrough backend xen/pciback: use resource_size() * 'stable/pci.fixes-3.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: xen/pci: support multi-segment systems xen-swiotlb: When doing coherent alloc/dealloc check before swizzling the MFNs. xen/pci: make bus notifier handler return sane values xen-swiotlb: fix printk and panic args xen-swiotlb: Fix wrong panic. xen-swiotlb: Retry up three times to allocate Xen-SWIOTLB xen-pcifront: Update warning comment to use 'e820_host' option.
| | | * xen/pci: support multi-segment systemsJan Beulich2011-09-221-3/+19
| | |/ | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now that the hypercall interface changes are in -unstable, make the kernel side code not ignore the segment (aka domain) number anymore (which results in pretty odd behavior on such systems). Rather, if only the old interfaces are available, don't call them for devices on non-zero segments at all. Signed-off-by: Jan Beulich <jbeulich@suse.com> [v1: Edited git description] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* | | xen/irq: If we fail during msi_capability_init return proper error code.Konrad Rzeszutek Wilk2011-10-191-3/+7
| |/ |/| | | | | | | | | | | | | There are three different modes: PV, HVM, and initial domain 0. In all the cases we would return -1 for failure instead of a proper error code. Fix this by propagating the error code from the generic IRQ code. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* | xen/pci: Use 'acpi_gsi_to_irq' value unconditionally.Konrad Rzeszutek Wilk2011-07-111-3/+2
| | | | | | | | | | | | | | | | | | | | In the past we would only use the function's value if the returned value was not equal to 'acpi_sci_override_gsi'. Meaning that the INT_SRV_OVR values for global and source irq were different. But it is OK to use the function's value even when the global and source irq are the same. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* | xen/pci: Remove 'xen_allocate_pirq_gsi'.Konrad Rzeszutek Wilk2011-07-111-25/+12
| | | | | | | | | | | | | | | | | | | | | | | | In the past (2.6.38) the 'xen_allocate_pirq_gsi' would allocate an entry in a Linux IRQ -> {XEN_IRQ, type, event, ..} array. All of that has been removed in 2.6.39 and the Xen IRQ subsystem uses an linked list that is populated when the call to 'xen_allocate_irq_gsi' (universally done from any of the xen_bind_* calls) is done. The 'xen_allocate_pirq_gsi' is a NOP and there is no need for it anymore so lets remove it. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* | xen/pci: Retire unnecessary #ifdef CONFIG_ACPIKonrad Rzeszutek Wilk2011-07-111-4/+0
| | | | | | | | | | | | | | | | As the code paths that are guarded by CONFIG_XEN_DOM0 already depend on CONFIG_ACPI so the extra #ifdef is not required. The earlier patch that added them in had done its job. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* | xen/pci: Move the allocation of IRQs when there are no IOAPIC's to the endKonrad Rzeszutek Wilk2011-07-111-12/+9
| | | | | | | | | | | | | | | | | | | | | | .. which means we can preset of NR_IRQS_LEGACY interrupts using the 'acpi_get_override_irq' API before this loop. This means that we can get the IRQ's polarity (and trigger) from either the ACPI (or MP); or use the default values. This fixes a bug if we did not have an IOAPIC we would not been able to preset the IRQ's polarity if the MP table existed. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* | xen/pci: Squash pci_xen_initial_domain and xen_setup_pirqs together.Konrad Rzeszutek Wilk2011-07-111-11/+6
| | | | | | | | | | | | | | Since they are only called once and the rest of the pci_xen_* functions follow the same pattern of setup. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* | xen/pci: Use the xen_register_pirq for HVM and initial domain usersKonrad Rzeszutek Wilk2011-07-111-52/+23
| | | | | | | | | | | | .. to cut down on the code duplicity. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* | xen/pci: In xen_register_pirq bind the GSI to the IRQ after the hypercall.Konrad Rzeszutek Wilk2011-07-111-16/+16
| | | | | | | | | | | | Not before .. also that code segment starts looking like the HVM one. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* | xen/pci: Provide #ifdef CONFIG_ACPI to easy code squashing.Konrad Rzeszutek Wilk2011-07-111-3/+8
| | | | | | | | | | | | | | | | | | | | In the past we would guard those code segments to be dependent on CONFIG_XEN_DOM0 (which depends on CONFIG_ACPI) so this patch is not stricly necessary. But the next patch will merge common HVM and initial domain code and we want to make sure the CONFIG_ACPI dependency is preserved - as HVM code does not depend on CONFIG_XEN_DOM0. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* | xen/pci: Update comments and fix empty spaces.Konrad Rzeszutek Wilk2011-07-111-7/+8
| | | | | | | | | | | | | | | | Update the out-dated comment at the beginning of the file. Also provide the copyrights of folks who have been contributing to this code lately. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* | xen/pci: Shuffle code around.Konrad Rzeszutek Wilk2011-07-111-173/+173
|/ | | | | | | | | | | The file is hard to read. Move the code around so that the contents of it follows a uniform format: - setup GSIs - PV, HVM, and initial domain case - then MSI/MSI-x setup - PV, HVM and then initial domain case. - then MSI/MSI-x teardown - same order. - lastly, the __init functions in PV, HVM, and initial domain order. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen/pci: Move check for acpi_sci_override_gsi to xen_setup_acpi_sci.Konrad Rzeszutek Wilk2011-07-071-28/+28
| | | | | | | | | | | | | | | | | | Previously we would check for acpi_sci_override_gsi == gsi every time a PCI device was enabled. That works during early bootup, but later on it could lead to triggering unnecessarily the acpi_gsi_to_irq(..) lookup. The reason is that acpi_sci_override_gsi was declared in __initdata and after early bootup could contain bogus values. This patch moves the check for acpi_sci_override_gsi to the site where the ACPI SCI is preset. CC: stable@kernel.org Reported-by: Raghavendra D Prabhu <rprabhu@wnohang.net> Tested-by: Raghavendra D Prabhu <rprabhu@wnohang.net> [http://lists.xensource.com/archives/html/xen-devel/2011-07/msg00154.html] Suggested-by: Ian Campbell <ijc@hellion.org.uk> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen/pci: Use the INT_SRC_OVR IRQ (instead of GSI) to preset the ACPI SCI IRQ.Konrad Rzeszutek Wilk2011-06-301-2/+24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In the past we would use the GSI value to preset the ACPI SCI IRQ which worked great as GSI == IRQ: ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level) While that is most often seen, there are some oddities: ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level) which means that GSI 20 (or pin 20) is to be overriden for IRQ 9. Our code that presets the interrupt for ACPI SCI however would use the GSI 20 instead of IRQ 9 ending up with: xen: sci override: global_irq=20 trigger=0 polarity=1 xen: registering gsi 20 triggering 0 polarity 1 xen: --> pirq=20 -> irq=20 xen: acpi sci 20 .. snip.. calling acpi_init+0x0/0xbc @ 1 ACPI: SCI (IRQ9) allocation failed ACPI Exception: AE_NOT_ACQUIRED, Unable to install System Control Interrupt handler (20110413/evevent-119) ACPI: Unable to start the ACPI Interpreter as the ACPI interpreter made a call to 'acpi_gsi_to_irq' which got nine. It used that value to request an IRQ (request_irq) and since that was not present it failed. The fix is to recognize that for interrupts that are overriden (in our case we only care about the ACPI SCI) we should use the IRQ number to present the IRQ instead of the using GSI. End result is that we get: xen: sci override: global_irq=20 trigger=0 polarity=1 xen: registering gsi 20 triggering 0 polarity 1 xen: --> pirq=20 -> irq=9 (gsi=9) xen: acpi sci 9 which fixes the ACPI interpreter failing on startup. CC: stable@kernel.org Reported-by: Liwei <xieliwei@gmail.com> Tested-by: Liwei <xieliwei@gmail.com> [http://lists.xensource.com/archives/html/xen-devel/2011-06/msg01727.html] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen/pci: Fix compiler error when CONFIG_XEN_PRIVILEGED_GUEST is not set.Konrad Rzeszutek Wilk2011-05-161-0/+2
| | | | | | | | | | | | | | | | | | | If we have CONFIG_XEN and the other parameters to build an Linux kernel that is non-privileged, the xen_[find|register|unregister]_ device_domain_owner functions should not be compiled. They should use the nops defined in arch/x86/include/asm/xen/pci.h instead. This fixes: arch/x86/pci/xen.c:496: error: redefinition of ‘xen_find_device_domain_owner’ arch/x86/include/asm/xen/pci.h:25: note: previous definition of ‘xen_find_device_domain_owner’ was here arch/x86/pci/xen.c:510: error: redefinition of ‘xen_register_device_domain_owner’ arch/x86/include/asm/xen/pci.h:29: note: previous definition of ‘xen_register_device_domain_owner’ was here arch/x86/pci/xen.c:532: error: redefinition of ‘xen_unregister_device_domain_owner’ arch/x86/include/asm/xen/pci.h:34: note: previous definition of ‘xen_unregister_device_domain_owner’ was here Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reported-by: Randy Dunlap <randy.dunlap@oracle.com>
* xen/irq: Check if the PCI device is owned by a domain different than DOMID_SELF.Konrad Rzeszutek Wilk2011-04-141-5/+16
| | | | | | | | | | | | | We check if there is a domain owner for the PCI device. In case of failure (meaning no domain has registered for this device) we make DOMID_SELF the owner. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> [v2: deal with rebasing on v2.6.37-1] [v3: deal with rebasing on stable/irq.cleanup] [v4: deal with rebasing on stable/irq.ween_of_nr_irqs] [v5: deal with rebasing on v2.6.39-rc3] Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Xiantao Zhang <xiantao.zhang@intel.com>
* xen/pci: Add xen_[find|register|unregister]_device_domain_owner functions.Konrad Rzeszutek Wilk2011-04-141-0/+73
| | | | | | | | | | | | | | When the Xen PCI backend is told to enable or disable MSI/MSI-X functions, the initial domain performs these operations. The initial domain needs to know which domain (guest) is going to use the PCI device so when it makes the appropiate hypercall to retrieve the MSI/MSI-X vector it will also assign the PCI device to the appropiate domain (guest). This boils down to us needing a mechanism to find, set and unset the domain id that will be using the device. [v2: EXPORT_SYMBOL -> EXPORT_SYMBOL_GPL.] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen: events: refactor GSI pirq bindings functionsIan Campbell2011-03-101-12/+29
| | | | | | | | | | | | | | Following the example set by xen_allocate_pirq_msi and xen_bind_pirq_msi_to_irq: xen_allocate_pirq becomes xen_allocate_pirq_gsi and now only allocates a pirq number and does not bind it. xen_map_pirq_gsi becomes xen_bind_pirq_gsi_to_irq and binds an existing pirq. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen: events: remove dom0 specific xen_create_msi_irqIan Campbell2011-03-101-5/+40
| | | | | | | | | | | The function name does not distinguish it from xen_allocate_pirq_msi (which operates on domU and pvhvm domains rather than dom0). Hoist domain 0 specific functionality up into the only caller leaving functionality common to all guest types in xen_bind_pirq_msi_to_irq. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen: events: use xen_bind_pirq_msi_to_irq from xen_create_msi_irqIan Campbell2011-03-101-2/+2
| | | | | Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen: events: push set_irq_msi down into xen_create_msi_irqIan Campbell2011-03-101-9/+1
| | | | | | | | Makes the tail end of this function look even more like xen_bind_pirq_msi_to_irq. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen: events: separate MSI PIRQ allocation from PIRQ binding to IRQIan Campbell2011-03-101-42/+26
| | | | | | | | | | | | | | Split the binding aspect of xen_allocate_pirq_msi out into a new xen_bind_pirq_to_irq function. In xen_hvm_setup_msi_irq when allocating a pirq write the MSI message to signal the PIRQ as soon as the pirq is obtained. There is no way to free the pirq back so if the subsequent binding to an IRQ fails we want to ensure that we will reuse the PIRQ next time rather than leak it. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen: pci: collapse apic_register_gsi_xen_hvm and xen_hvm_register_pirqIan Campbell2011-03-101-8/+3
| | | | | | | | apic_register_gsi_xen_hvm is a tiny wrapper around xen_hvm_register_pirq. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen: events: return irq from xen_allocate_pirq_msiIan Campbell2011-03-101-6/+6
| | | | | | | consistent with other similar functions. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen: events: drop XEN_ALLOC_IRQ flag to xen_allocate_pirq_msiIan Campbell2011-03-101-3/+3
| | | | | | | All callers pass this flag so it is pointless. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen: pci: only define xen_initdom_setup_msi_irqs if CONFIG_XEN_DOM0Ian Campbell2011-03-101-0/+2
| | | | | | | | | Fixes: CC arch/x86/pci/xen.o arch/x86/pci/xen.c:183: warning: 'xen_initdom_setup_msi_irqs' defined but not used Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* Merge branch 'stable/pcifront-fixes' into stable/irq.cleanupKonrad Rzeszutek Wilk2011-03-101-5/+8
|\ | | | | | | | | | | | | | | | | * stable/pcifront-fixes: pci/xen: When free-ing MSI-X/MSI irq->desc also use generic code. pci/xen: Cleanup: convert int** to int[] pci/xen: Use xen_allocate_pirq_msi instead of xen_allocate_pirq xen-pcifront: Sanity check the MSI/MSI-X values xen-pcifront: don't use flush_scheduled_work()
| * pci/xen: When free-ing MSI-X/MSI irq->desc also use generic code.Konrad Rzeszutek Wilk2011-02-181-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This code path is only run when an MSI/MSI-X PCI device is passed in to PV DomU. In 2.6.37 time-frame we over-wrote the default cleanup handler for MSI/MSI-X irq->desc to be "xen_teardown_msi_irqs". That function calls the the xen-pcifront driver which can tell the backend to cleanup/take back the MSI/MSI-X device. However, we forgot to continue the process of free-ing the MSI/MSI-X device resources (irq->desc) in the PV domU side. Which is what the default cleanup handler: default_teardown_msi_irqs did. Hence we would leak IRQ descriptors. Without this patch, doing "rmmod igbvf;modprobe igbvf" multiple times ends with abandoned IRQ descriptors: 28: 5 xen-pirq-pcifront-msi-x 29: 8 xen-pirq-pcifront-msi-x ... 130: 10 xen-pirq-pcifront-msi-x with the end result of running out of IRQ descriptors. Reviewed-by: Ian Campbell <Ian.Campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
| * pci/xen: Cleanup: convert int** to int[]Konrad Rzeszutek Wilk2011-02-181-2/+2
| | | | | | | | | | | | | | | | Cleanup code. Cosmetic change to make the code look easier to read. Reviewed-by: Ian Campbell <Ian.Campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
| * pci/xen: Use xen_allocate_pirq_msi instead of xen_allocate_pirqKonrad Rzeszutek Wilk2011-02-181-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | xen_allocate_pirq -> xen_map_pirq_gsi -> PHYSDEVOP_alloc_irq_vector IFF xen_initial_domain() in addition to the kernel side book-keeping side of things (set chip and handler, update irq_info etc) whereas xen_allocate_pirq_msi just does the kernel book keeping. Also xen_allocate_pirq allocates an IRQ in the 1-1 GSI space whereas xen_allocate_pirq_msi allocates a dynamic one in the >GSI IRQ space. All of this is uneccessary as this code path is only executed when we run as a domU PV guest with an MSI/MSI-X PCI card passed in. Hence we can jump straight to allocating an dynamic IRQ (and binding it to the proper PIRQ) and skip the rest. In short: this change is a cosmetic one. Reviewed-by: Ian Campbell <Ian.Campbell@citrix.com> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* | xen: handled remapped IRQs when enabling a pcifront PCI device.Ian Campbell2011-03-031-8/+14
|/ | | | | | | | | | | | This happens to not be an issue currently because we take pains to try to ensure that the GSI-IRQ mapping is 1-1 in a PV guest and that regular event channels do not clash. However a subsequent patch is going to break this 1-1 mapping. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org>
* xen: fix MSI setup and teardown for PV on HVM guestsStefano Stabellini2010-12-021-7/+20
| | | | | | | | | | | | | | | | | | | When remapping MSIs into pirqs for PV on HVM guests, qemu is responsible for doing the actual mapping and unmapping. We only give qemu the desired pirq number when we ask to do the mapping the first time, after that we should be reading back the pirq number from qemu every time we want to re-enable the MSI. This fixes a bug in xen_hvm_setup_msi_irqs that manifests itself when trying to enable the same MSI for the second time: the old MSI to pirq mapping is still valid at this point but xen_hvm_setup_msi_irqs would try to assign a new pirq anyway. A simple way to reproduce this bug is to assign an MSI capable network card to a PV on HVM guest, if the user brings down the corresponding ethernet interface and up again, Linux would fail to enable MSIs on the device. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
* xen: fix memory leak in Xen PCI MSI/MSI-X allocator.Jiri Slaby2010-11-081-3/+5
| | | | | | | | | | | | | Stanse found that xen_setup_msi_irqs leaks memory when xen_allocate_pirq fails. Free the memory in that fail path. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: xen-devel@lists.xensource.com Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: x86@kernel.org
* xen: add a missing #include to arch/x86/pci/xen.cStefano Stabellini2010-10-221-0/+1
| | | | | | Add missing #include <asm/io_apic.h> to arch/x86/pci/xen.c. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
* xen: remap MSIs into pirqs when running as initial domainQing He2010-10-221-18/+37
| | | | | | | | | | | | Implement xen_create_msi_irq to create an msi and remap it as pirq. Use xen_create_msi_irq to implement an initial domain specific version of setup_msi_irqs. Signed-off-by: Qing He <qing.he@intel.com> Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen: remap GSIs as pirqs when running as initial domainJeremy Fitzhardinge2010-10-221-0/+135
| | | | | | | | | | | | Implement xen_register_gsi to setup the correct triggering and polarity properties of a gsi. Implement xen_register_pirq to register a particular gsi as pirq and receive interrupts as events. Call xen_setup_pirqs to register all the legacy ISA irqs as pirqs. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen: map MSIs into pirqsStefano Stabellini2010-10-221-0/+57
| | | | | | | | Map MSIs into pirqs, writing 0 in the MSI vector data field and the pirq number in the MSI destination id field. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen: support GSI -> pirq remapping in PV on HVM guestsStefano Stabellini2010-10-221-0/+16
| | | | | | | | | | Disable pcifront when running on HVM: it is meant to be used with pv guests that don't have PCI bus. Use acpi_register_gsi_xen_hvm to remap GSIs into pirqs. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen: add xen hvm acpi_register_gsi variantJeremy Fitzhardinge2010-10-221-0/+6
| | | | | | | Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
* xen: implement xen_hvm_register_pirqStefano Stabellini2010-10-221-0/+38
| | | | | | | | xen_hvm_register_pirq allows the kernel to map a GSI into a Xen pirq and receive the interrupt as an event channel from that point on. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* X86/PCI: Remove the dependency on isapnp_disable.Konrad Rzeszutek Wilk2010-10-211-5/+0
| | | | | | | | | | | | | | | | This looks to be vestigial dependency that had never been used even in the original code base (2.6.18) from which this driver was up-ported. Without this fix, with the CONFIG_ISAPNP, we get this compile failure: arch/x86/pci/xen.c: In function 'pci_xen_init': arch/x86/pci/xen.c:138: error: 'isapnp_disable' undeclared (first use in this function) arch/x86/pci/xen.c:138: error: (Each undeclared identifier is reported only once arch/x86/pci/xen.c:138: error: for each function it appears in.) Reported-by: Li Zefan <lizf@cn.fujitsu.com> Tested-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen/x86/PCI: Add support for the Xen PCI subsystemAlex Nixon2010-10-181-0/+147
The frontend stub lives in arch/x86/pci/xen.c, alongside other sub-arch PCI init code (e.g. olpc.c). It provides a mechanism for Xen PCI frontend to setup/destroy legacy interrupts, MSI/MSI-X, and PCI configuration operations. [ Impact: add core of Xen PCI support ] [ v2: Removed the IOMMU code and only focusing on PCI.] [ v3: removed usage of pci_scan_all_fns as that does not exist] [ v4: introduced pci_xen value to fix compile warnings] [ v5: squished fixes+features in one patch, changed Reviewed-by to Ccs] [ v7: added Acked-by] Signed-off-by: Alex Nixon <alex.nixon@citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Matthew Wilcox <willy@linux.intel.com> Cc: Qing He <qing.he@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: x86@kernel.org
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