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author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-30 21:01:36 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-30 21:01:36 -0700 |
commit | bad60e6f259a01cf9f29a1ef8d435ab6c60b2de9 (patch) | |
tree | c9aaa8166735659761239c117af2b11b022bc6cb /include | |
parent | dd0f0cf58af70dc9267409f113bea772d57f675c (diff) | |
parent | 719dbb2df78fc9a40e28392b07cd715bfc5a665c (diff) | |
download | linux-stable-bad60e6f259a01cf9f29a1ef8d435ab6c60b2de9.tar.gz linux-stable-bad60e6f259a01cf9f29a1ef8d435ab6c60b2de9.tar.bz2 linux-stable-bad60e6f259a01cf9f29a1ef8d435ab6c60b2de9.zip |
Merge tag 'powerpc-4.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc updates from Michael Ellerman:
"Highlights:
- PowerNV PCI hotplug support.
- Lots more Power9 support.
- eBPF JIT support on ppc64le.
- Lots of cxl updates.
- Boot code consolidation.
Bug fixes:
- Fix spin_unlock_wait() from Boqun Feng
- Fix stack pointer corruption in __tm_recheckpoint() from Michael
Neuling
- Fix multiple bugs in memory_hotplug_max() from Bharata B Rao
- mm: Ensure "special" zones are empty from Oliver O'Halloran
- ftrace: Separate the heuristics for checking call sites from
Michael Ellerman
- modules: Never restore r2 for a mprofile-kernel style mcount() call
from Michael Ellerman
- Fix endianness when reading TCEs from Alexey Kardashevskiy
- start rtasd before PCI probing from Greg Kurz
- PCI: rpaphp: Fix slot registration for multiple slots under a PHB
from Tyrel Datwyler
- powerpc/mm: Add memory barrier in __hugepte_alloc() from Sukadev
Bhattiprolu
Cleanups & fixes:
- Drop support for MPIC in pseries from Rashmica Gupta
- Define and use PPC64_ELF_ABI_v2/v1 from Michael Ellerman
- Remove unused symbols in asm-offsets.c from Rashmica Gupta
- Fix SRIOV not building without EEH enabled from Russell Currey
- Remove kretprobe_trampoline_holder from Thiago Jung Bauermann
- Reduce log level of PCI I/O space warning from Benjamin
Herrenschmidt
- Add array bounds checking to crash_shutdown_handlers from Suraj
Jitindar Singh
- Avoid -maltivec when using clang integrated assembler from Anton
Blanchard
- Fix array overrun in ppc_rtas() syscall from Andrew Donnellan
- Fix error return value in cmm_mem_going_offline() from Rasmus
Villemoes
- export cpu_to_core_id() from Mauricio Faria de Oliveira
- Remove old symbols from defconfigs from Andrew Donnellan
- Update obsolete comments in setup_32.c about entry conditions from
Benjamin Herrenschmidt
- Add comment explaining the purpose of setup_kdump_trampoline() from
Benjamin Herrenschmidt
- Merge the RELOCATABLE config entries for ppc32 and ppc64 from Kevin
Hao
- Remove RELOCATABLE_PPC32 from Kevin Hao
- Fix .long's in tlb-radix.c to more meaningful from Balbir Singh
Minor cleanups & fixes:
- Andrew Donnellan, Anna-Maria Gleixner, Anton Blanchard, Benjamin
Herrenschmidt, Bharata B Rao, Christophe Leroy, Colin Ian King,
Geliang Tang, Greg Kurz, Madhavan Srinivasan, Michael Ellerman,
Michael Ellerman, Stephen Rothwell, Stewart Smith.
Freescale updates from Scott:
- "Highlights include more 8xx optimizations, device tree updates,
and MVME7100 support."
PowerNV PCI hotplug from Gavin Shan:
- PCI: Add pcibios_setup_bridge()
- Override pcibios_setup_bridge()
- Remove PCI_RESET_DELAY_US
- Move pnv_pci_ioda_setup_opal_tce_kill() around
- Increase PE# capacity
- Allocate PE# in reverse order
- Create PEs in pcibios_setup_bridge()
- Setup PE for root bus
- Extend PCI bridge resources
- Make pnv_ioda_deconfigure_pe() visible
- Dynamically release PE
- Update bridge windows on PCI plug
- Delay populating pdn
- Support PCI slot ID
- Use PCI slot reset infrastructure
- Introduce pnv_pci_get_slot_id()
- Functions to get/set PCI slot state
- PCI/hotplug: PowerPC PowerNV PCI hotplug driver
- Print correct PHB type names
Power9 idle support from Shreyas B. Prabhu:
- set power_save func after the idle states are initialized
- Use PNV_THREAD_WINKLE macro while requesting for winkle
- make hypervisor state restore a function
- Rename idle_power7.S to idle_book3s.S
- Rename reusable idle functions to hardware agnostic names
- Make pnv_powersave_common more generic
- abstraction for saving SPRs before entering deep idle states
- Add platform support for stop instruction
- cpuidle/powernv: Use CPUIDLE_STATE_MAX instead of MAX_POWERNV_IDLE_STATES
- cpuidle/powernv: cleanup cpuidle-powernv.c
- cpuidle/powernv: Add support for POWER ISA v3 idle states
- Use deepest stop state when cpu is offlined
Power9 PMU from Madhavan Srinivasan:
- factor out power8 pmu macros and defines
- factor out power8 pmu functions
- factor out power8 __init_pmu code
- Add power9 event list macros for generic and cache events
- Power9 PMU support
- Export Power9 generic and cache events to sysfs
Power9 preliminary interrupt & PCI support from Benjamin Herrenschmidt:
- Add XICS emulation APIs
- Move a few exception common handlers to make room
- Add support for HV virtualization interrupts
- Add mechanism to force a replay of interrupts
- Add ICP OPAL backend
- Discover IODA3 PHBs
- pci: Remove obsolete SW invalidate
- opal: Add real mode call wrappers
- Rename TCE invalidation calls
- Remove SWINV constants and obsolete TCE code
- Rework accessing the TCE invalidate register
- Fallback to OPAL for TCE invalidations
- Use the device-tree to get available range of M64's
- Check status of a PHB before using it
- pci: Don't try to allocate resources that will be reassigned
Other Power9:
- Send SIGBUS on unaligned copy and paste from Chris Smart
- Large Decrementer support from Oliver O'Halloran
- Load Monitor Register Support from Jack Miller
Performance improvements from Anton Blanchard:
- Avoid load hit store in __giveup_fpu() and __giveup_altivec()
- Avoid load hit store in setup_sigcontext()
- Remove assembly versions of strcpy, strcat, strlen and strcmp
- Align hot loops of some string functions
eBPF JIT from Naveen N. Rao:
- Fix/enhance 32-bit Load Immediate implementation
- Optimize 64-bit Immediate loads
- Introduce rotate immediate instructions
- A few cleanups
- Isolate classic BPF JIT specifics into a separate header
- Implement JIT compiler for extended BPF
Operator Panel driver from Suraj Jitindar Singh:
- devicetree/bindings: Add binding for operator panel on FSP machines
- Add inline function to get rc from an ASYNC_COMP opal_msg
- Add driver for operator panel on FSP machines
Sparse fixes from Daniel Axtens:
- make some things static
- Introduce asm-prototypes.h
- Include headers containing prototypes
- Use #ifdef __BIG_ENDIAN__ #else for REG_BYTE
- kvm: Clarify __user annotations
- Pass endianness to sparse
- Make ppc_md.{halt, restart} __noreturn
MM fixes & cleanups from Aneesh Kumar K.V:
- radix: Update LPCR HR bit as per ISA
- use _raw variant of page table accessors
- Compile out radix related functions if RADIX_MMU is disabled
- Clear top 16 bits of va only on older cpus
- Print formation regarding the the MMU mode
- hash: Update SDR1 size encoding as documented in ISA 3.0
- radix: Update PID switch sequence
- radix: Update machine call back to support new HCALL.
- radix: Add LPID based tlb flush helpers
- radix: Add a kernel command line to disable radix
- Cleanup LPCR defines
Boot code consolidation from Benjamin Herrenschmidt:
- Move epapr_paravirt_early_init() to early_init_devtree()
- cell: Don't use flat device-tree after boot
- ge_imp3a: Don't use the flat device-tree after boot
- mpc85xx_ds: Don't use the flat device-tree after boot
- mpc85xx_rdb: Don't use the flat device-tree after boot
- Don't test for machine type in rtas_initialize()
- Don't test for machine type in smp_setup_cpu_maps()
- dt: Add of_device_compatible_match()
- Factor do_feature_fixup calls
- Move 64-bit feature fixup earlier
- Move 64-bit memory reserves to setup_arch()
- Use a cachable DART
- Move FW feature probing out of pseries probe()
- Put exception configuration in a common place
- Remove early allocation of the SMU command buffer
- Move MMU backend selection out of platform code
- pasemi: Remove IOBMAP allocation from platform probe()
- mm/hash: Don't use machine_is() early during boot
- Don't test for machine type to detect HEA special case
- pmac: Remove spurrious machine type test
- Move hash table ops to a separate structure
- Ensure that ppc_md is empty before probing for machine type
- Move 64-bit probe_machine() to later in the boot process
- Move 32-bit probe() machine to later in the boot process
- Get rid of ppc_md.init_early()
- Move the boot time info banner to a separate function
- Move setting of {i,d}cache_bsize to initialize_cache_info()
- Move the content of setup_system() to setup_arch()
- Move cache info inits to a separate function
- Re-order the call to smp_setup_cpu_maps()
- Re-order setup_panic()
- Make a few boot functions __init
- Merge 32-bit and 64-bit setup_arch()
Other new features:
- tty/hvc: Use IRQF_SHARED for OPAL hvc consoles from Sam Mendoza-Jonas
- tty/hvc: Use opal irqchip interface if available from Sam Mendoza-Jonas
- powerpc: Add module autoloading based on CPU features from Alastair D'Silva
- crypto: vmx - Convert to CPU feature based module autoloading from Alastair D'Silva
- Wake up kopald polling thread before waiting for events from Benjamin Herrenschmidt
- xmon: Dump ISA 2.06 SPRs from Michael Ellerman
- xmon: Dump ISA 2.07 SPRs from Michael Ellerman
- Add a parameter to disable 1TB segs from Oliver O'Halloran
- powerpc/boot: Add OPAL console to epapr wrappers from Oliver O'Halloran
- Assign fixed PHB number based on device-tree properties from Guilherme G. Piccoli
- pseries: Add pseries hotplug workqueue from John Allen
- pseries: Add support for hotplug interrupt source from John Allen
- pseries: Use kernel hotplug queue for PowerVM hotplug events from John Allen
- pseries: Move property cloning into its own routine from Nathan Fontenot
- pseries: Dynamic add entires to associativity lookup array from Nathan Fontenot
- pseries: Auto-online hotplugged memory from Nathan Fontenot
- pseries: Remove call to memblock_add() from Nathan Fontenot
cxl:
- Add set and get private data to context struct from Michael Neuling
- make base more explicitly non-modular from Paul Gortmaker
- Use for_each_compatible_node() macro from Wei Yongjun
- Frederic Barrat
- Abstract the differences between the PSL and XSL
- Make vPHB device node match adapter's
- Philippe Bergheaud
- Add mechanism for delivering AFU driver specific events
- Ignore CAPI adapters misplaced in switched slots
- Refine slice error debug messages
- Andrew Donnellan
- static-ify variables to fix sparse warnings
- PCI/hotplug: pnv_php: export symbols and move struct types needed by cxl
- PCI/hotplug: pnv_php: handle OPAL_PCI_SLOT_OFFLINE power state
- Add cxl_check_and_switch_mode() API to switch bi-modal cards
- remove dead Kconfig options
- fix potential NULL dereference in free_adapter()
- Ian Munsie
- Update process element after allocating interrupts
- Add support for CAPP DMA mode
- Fix allowing bogus AFU descriptors with 0 maximum processes
- Fix allocating a minimum of 2 pages for the SPA
- Fix bug where AFU disable operation had no effect
- Workaround XSL bug that does not clear the RA bit after a reset
- Fix NULL pointer dereference on kernel contexts with no AFU interrupts
- powerpc/powernv: Split cxl code out into a separate file
- Add cxl_slot_is_supported API
- Enable bus mastering for devices using CAPP DMA mode
- Move cxl_afu_get / cxl_afu_put to base
- Allow a default context to be associated with an external pci_dev
- Do not create vPHB if there are no AFU configuration records
- powerpc/powernv: Add support for the cxl kernel api on the real phb
- Add support for using the kernel API with a real PHB
- Add kernel APIs to get & set the max irqs per context
- Add preliminary workaround for CX4 interrupt limitation
- Add support for interrupts on the Mellanox CX4
- Workaround PE=0 hardware limitation in Mellanox CX4
- powerpc/powernv: Fix pci-cxl.c build when CONFIG_MODULES=n
selftests:
- Test unaligned copy and paste from Chris Smart
- Load Monitor Register Tests from Jack Miller
- Cyril Bur
- exec() with suspended transaction
- Use signed long to read perf_event_paranoid
- Fix usage message in context_switch
- Fix generation of vector instructions/types in context_switch
- Michael Ellerman
- Use "Delta" rather than "Error" in normal output
- Import Anton's mmap & futex micro benchmarks
- Add a test for PROT_SAO"
* tag 'powerpc-4.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (263 commits)
powerpc/mm: Parenthesise IS_ENABLED() in if condition
tty/hvc: Use opal irqchip interface if available
tty/hvc: Use IRQF_SHARED for OPAL hvc consoles
selftests/powerpc: exec() with suspended transaction
powerpc: Improve comment explaining why we modify VRSAVE
powerpc/mm: Drop unused externs for hpte_init_beat[_v3]()
powerpc/mm: Rename hpte_init_lpar() and move the fallback to a header
powerpc/mm: Fix build break when PPC_NATIVE=n
crypto: vmx - Convert to CPU feature based module autoloading
powerpc: Add module autoloading based on CPU features
powerpc/powernv/ioda: Fix endianness when reading TCEs
powerpc/mm: Add memory barrier in __hugepte_alloc()
powerpc/modules: Never restore r2 for a mprofile-kernel style mcount() call
powerpc/ftrace: Separate the heuristics for checking call sites
powerpc: Merge 32-bit and 64-bit setup_arch()
powerpc/64: Make a few boot functions __init
powerpc: Re-order setup_panic()
powerpc: Re-order the call to smp_setup_cpu_maps()
powerpc/32: Move cache info inits to a separate function
powerpc/64: Move the content of setup_system() to setup_arch()
...
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/of.h | 2 | ||||
-rw-r--r-- | include/linux/pci.h | 1 | ||||
-rw-r--r-- | include/misc/cxl-base.h | 14 | ||||
-rw-r--r-- | include/misc/cxl.h | 114 | ||||
-rw-r--r-- | include/uapi/misc/cxl.h | 17 |
5 files changed, 148 insertions, 0 deletions
diff --git a/include/linux/of.h b/include/linux/of.h index 15c43f076b23..eb8d4b4c5dfc 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -324,6 +324,8 @@ extern int of_property_read_string_helper(const struct device_node *np, const char **out_strs, size_t sz, int index); extern int of_device_is_compatible(const struct device_node *device, const char *); +extern int of_device_compatible_match(struct device_node *device, + const char *const *compat); extern bool of_device_is_available(const struct device_node *device); extern bool of_device_is_big_endian(const struct device_node *device); extern const void *of_get_property(const struct device_node *node, diff --git a/include/linux/pci.h b/include/linux/pci.h index b67e4df20801..c40ac910cce4 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -854,6 +854,7 @@ void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev); void pci_stop_root_bus(struct pci_bus *bus); void pci_remove_root_bus(struct pci_bus *bus); void pci_setup_cardbus(struct pci_bus *bus); +void pcibios_setup_bridge(struct pci_bus *bus, unsigned long type); void pci_sort_breadthfirst(void); #define dev_is_pci(d) ((d)->bus == &pci_bus_type) #define dev_is_pf(d) ((dev_is_pci(d) ? to_pci_dev(d)->is_physfn : false)) diff --git a/include/misc/cxl-base.h b/include/misc/cxl-base.h index 5ae962512fb8..b2ebc91fe09a 100644 --- a/include/misc/cxl-base.h +++ b/include/misc/cxl-base.h @@ -10,6 +10,8 @@ #ifndef _MISC_CXL_BASE_H #define _MISC_CXL_BASE_H +#include <misc/cxl.h> + #ifdef CONFIG_CXL_BASE #define CXL_IRQ_RANGES 4 @@ -36,12 +38,24 @@ static inline void cxl_ctx_put(void) atomic_dec(&cxl_use_count); } +struct cxl_afu *cxl_afu_get(struct cxl_afu *afu); +void cxl_afu_put(struct cxl_afu *afu); void cxl_slbia(struct mm_struct *mm); +bool cxl_pci_associate_default_context(struct pci_dev *dev, struct cxl_afu *afu); +void cxl_pci_disable_device(struct pci_dev *dev); +int cxl_cx4_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type); +void cxl_cx4_teardown_msi_irqs(struct pci_dev *pdev); #else /* CONFIG_CXL_BASE */ static inline bool cxl_ctx_in_use(void) { return false; } +static inline struct cxl_afu *cxl_afu_get(struct cxl_afu *afu) { return NULL; } +static inline void cxl_afu_put(struct cxl_afu *afu) {} static inline void cxl_slbia(struct mm_struct *mm) {} +static inline bool cxl_pci_associate_default_context(struct pci_dev *dev, struct cxl_afu *afu) { return false; } +static inline void cxl_pci_disable_device(struct pci_dev *dev) {} +static inline int cxl_cx4_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) { return -ENODEV; } +static inline void cxl_cx4_teardown_msi_irqs(struct pci_dev *pdev) {} #endif /* CONFIG_CXL_BASE */ diff --git a/include/misc/cxl.h b/include/misc/cxl.h index 56560c5781b4..480d50a0b8ba 100644 --- a/include/misc/cxl.h +++ b/include/misc/cxl.h @@ -24,6 +24,46 @@ * generic PCI API. This API is agnostic to the actual AFU. */ +#define CXL_SLOT_FLAG_DMA 0x1 + +/* + * Checks if the given card is in a cxl capable slot. Pass CXL_SLOT_FLAG_DMA if + * the card requires CAPP DMA mode to also check if the system supports it. + * This is intended to be used by bi-modal devices to determine if they can use + * cxl mode or if they should continue running in PCI mode. + * + * Note that this only checks if the slot is cxl capable - it does not + * currently check if the CAPP is currently available for chips where it can be + * assigned to different PHBs on a first come first serve basis (i.e. P8) + */ +bool cxl_slot_is_supported(struct pci_dev *dev, int flags); + + +#define CXL_BIMODE_CXL 1 +#define CXL_BIMODE_PCI 2 + +/* + * Check the mode that the given bi-modal CXL adapter is currently in and + * change it if necessary. This does not apply to AFU drivers. + * + * If the mode matches the requested mode this function will return 0 - if the + * driver was expecting the generic CXL driver to have bound to the adapter and + * it gets this return value it should fail the probe function to give the CXL + * driver a chance to probe it. + * + * If the mode does not match it will start a background task to unplug the + * device from Linux and switch its mode, and will return -EBUSY. At this + * point the calling driver should make sure it has released the device and + * fail its probe function. + * + * The offset of the CXL VSEC can be provided to this function. If 0 is passed, + * this function will search for a CXL VSEC with ID 0x1280 and return -ENODEV + * if it is not found. + */ +#ifdef CONFIG_CXL_BIMODAL +int cxl_check_and_switch_mode(struct pci_dev *dev, int mode, int vsec); +#endif + /* Get the AFU associated with a pci_dev */ struct cxl_afu *cxl_pci_to_afu(struct pci_dev *dev); @@ -86,6 +126,13 @@ struct cxl_context *cxl_dev_context_init(struct pci_dev *dev); int cxl_release_context(struct cxl_context *ctx); /* + * Set and get private data associated with a context. Allows drivers to have a + * back pointer to some useful structure. + */ +int cxl_set_priv(struct cxl_context *ctx, void *priv); +void *cxl_get_priv(struct cxl_context *ctx); + +/* * Allocate AFU interrupts for this context. num=0 will allocate the default * for this AFU as given in the AFU descriptor. This number doesn't include the * interrupt 0 (CAIA defines AFU IRQ 0 for page faults). Each interrupt to be @@ -144,6 +191,25 @@ void cxl_psa_unmap(void __iomem *addr); /* Get the process element for this context */ int cxl_process_element(struct cxl_context *ctx); +/* + * Limit the number of interrupts that a single context can allocate via + * cxl_start_work. If using the api with a real phb, this may be used to + * request that additional default contexts be created when allocating + * interrupts via pci_enable_msix_range. These will be set to the same running + * state as the default context, and if that is running it will reuse the + * parameters previously passed to cxl_start_context for the default context. + */ +int cxl_set_max_irqs_per_process(struct pci_dev *dev, int irqs); +int cxl_get_max_irqs_per_process(struct pci_dev *dev); + +/* + * Use to simultaneously iterate over hardware interrupt numbers, contexts and + * afu interrupt numbers allocated for the device via pci_enable_msix_range and + * is a useful convenience function when working with hardware that has + * limitations on the number of interrupts per process. *ctx and *afu_irq + * should be NULL and 0 to start the iteration. + */ +int cxl_next_msi_hwirq(struct pci_dev *pdev, struct cxl_context **ctx, int *afu_irq); /* * These calls allow drivers to create their own file descriptors and make them @@ -220,4 +286,52 @@ void cxl_perst_reloads_same_image(struct cxl_afu *afu, */ ssize_t cxl_read_adapter_vpd(struct pci_dev *dev, void *buf, size_t count); +/* + * AFU driver ops allow an AFU driver to create their own events to pass to + * userspace through the file descriptor as a simpler alternative to overriding + * the read() and poll() calls that works with the generic cxl events. These + * events are given priority over the generic cxl events, so they will be + * delivered first if multiple types of events are pending. + * + * The AFU driver must call cxl_context_events_pending() to notify the cxl + * driver that new events are ready to be delivered for a specific context. + * cxl_context_events_pending() will adjust the current count of AFU driver + * events for this context, and wake up anyone waiting on the context wait + * queue. + * + * The cxl driver will then call fetch_event() to get a structure defining + * the size and address of the driver specific event data. The cxl driver + * will build a cxl header with type and process_element fields filled in, + * and header.size set to sizeof(struct cxl_event_header) + data_size. + * The total size of the event is limited to CXL_READ_MIN_SIZE (4K). + * + * fetch_event() is called with a spin lock held, so it must not sleep. + * + * The cxl driver will then deliver the event to userspace, and finally + * call event_delivered() to return the status of the operation, identified + * by cxl context and AFU driver event data pointers. + * 0 Success + * -EFAULT copy_to_user() has failed + * -EINVAL Event data pointer is NULL, or event size is greater than + * CXL_READ_MIN_SIZE. + */ +struct cxl_afu_driver_ops { + struct cxl_event_afu_driver_reserved *(*fetch_event) ( + struct cxl_context *ctx); + void (*event_delivered) (struct cxl_context *ctx, + struct cxl_event_afu_driver_reserved *event, + int rc); +}; + +/* + * Associate the above driver ops with a specific context. + * Reset the current count of AFU driver events. + */ +void cxl_set_driver_ops(struct cxl_context *ctx, + struct cxl_afu_driver_ops *ops); + +/* Notify cxl driver that new events are ready to be delivered for context */ +void cxl_context_events_pending(struct cxl_context *ctx, + unsigned int new_events); + #endif /* _MISC_CXL_H */ diff --git a/include/uapi/misc/cxl.h b/include/uapi/misc/cxl.h index 8cd334f99ddc..cbae529b7ce0 100644 --- a/include/uapi/misc/cxl.h +++ b/include/uapi/misc/cxl.h @@ -93,6 +93,7 @@ enum cxl_event_type { CXL_EVENT_AFU_INTERRUPT = 1, CXL_EVENT_DATA_STORAGE = 2, CXL_EVENT_AFU_ERROR = 3, + CXL_EVENT_AFU_DRIVER = 4, }; struct cxl_event_header { @@ -124,12 +125,28 @@ struct cxl_event_afu_error { __u64 error; }; +struct cxl_event_afu_driver_reserved { + /* + * Defines the buffer passed to the cxl driver by the AFU driver. + * + * This is not ABI since the event header.size passed to the user for + * existing events is set in the read call to sizeof(cxl_event_header) + * + sizeof(whatever event is being dispatched) and the user is already + * required to use a 4K buffer on the read call. + * + * Of course the contents will be ABI, but that's up the AFU driver. + */ + size_t data_size; + u8 data[]; +}; + struct cxl_event { struct cxl_event_header header; union { struct cxl_event_afu_interrupt irq; struct cxl_event_data_storage fault; struct cxl_event_afu_error afu_error; + struct cxl_event_afu_driver_reserved afu_driver_event; }; }; |