Merge tag 'powerpc-5.2-1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc updates from Michael Ellerman:
 "Slightly delayed due to the issue with printk() calling
  probe_kernel_read() interacting with our new user access prevention
  stuff, but all fixed now.

  The only out-of-area changes are the addition of a cpuhp_state, small
  additions to Documentation and MAINTAINERS updates.

  Highlights:

   - Support for Kernel Userspace Access/Execution Prevention (like
     SMAP/SMEP/PAN/PXN) on some 64-bit and 32-bit CPUs. This prevents
     the kernel from accidentally accessing userspace outside
     copy_to/from_user(), or ever executing userspace.

   - KASAN support on 32-bit.

   - Rework of where we map the kernel, vmalloc, etc. on 64-bit hash to
     use the same address ranges we use with the Radix MMU.

   - A rewrite into C of large parts of our idle handling code for
     64-bit Book3S (ie. power8 & power9).

   - A fast path entry for syscalls on 32-bit CPUs, for a 12-17% speedup
     in the null_syscall benchmark.

   - On 64-bit bare metal we have support for recovering from errors
     with the time base (our clocksource), however if that fails
     currently we hang in __delay() and never crash. We now have support
     for detecting that case and short circuiting __delay() so we at
     least panic() and reboot.

   - Add support for optionally enabling the DAWR on Power9, which had
     to be disabled by default due to a hardware erratum. This has the
     effect of enabling hardware breakpoints for GDB, the downside is a
     badly behaved program could crash the machine by pointing the DAWR
     at cache inhibited memory. This is opt-in obviously.

   - xmon, our crash handler, gets support for a read only mode where
     operations that could change memory or otherwise disturb the system
     are disabled.

  Plus many clean-ups, reworks and minor fixes etc.

  Thanks to: Christophe Leroy, Akshay Adiga, Alastair D'Silva, Alexey
  Kardashevskiy, Andrew Donnellan, Aneesh Kumar K.V, Anju T Sudhakar,
  Anton Blanchard, Ben Hutchings, Bo YU, Breno Leitao, Cédric Le Goater,
  Christopher M. Riedl, Christoph Hellwig, Colin Ian King, David Gibson,
  Ganesh Goudar, Gautham R. Shenoy, George Spelvin, Greg Kroah-Hartman,
  Greg Kurz, Horia Geantă, Jagadeesh Pagadala, Joel Stanley, Joe
  Perches, Julia Lawall, Laurentiu Tudor, Laurent Vivier, Lukas Bulwahn,
  Madhavan Srinivasan, Mahesh Salgaonkar, Mathieu Malaterre, Michael
  Neuling, Mukesh Ojha, Nathan Fontenot, Nathan Lynch, Nicholas Piggin,
  Nick Desaulniers, Oliver O'Halloran, Peng Hao, Qian Cai, Ravi
  Bangoria, Rick Lindsley, Russell Currey, Sachin Sant, Stewart Smith,
  Sukadev Bhattiprolu, Thomas Huth, Tobin C. Harding, Tyrel Datwyler,
  Valentin Schneider, Wei Yongjun, Wen Yang, YueHaibing"

* tag 'powerpc-5.2-1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (205 commits)
  powerpc/64s: Use early_mmu_has_feature() in set_kuap()
  powerpc/book3s/64: check for NULL pointer in pgd_alloc()
  powerpc/mm: Fix hugetlb page initialization
  ocxl: Fix return value check in afu_ioctl()
  powerpc/mm: fix section mismatch for setup_kup()
  powerpc/mm: fix redundant inclusion of pgtable-frag.o in Makefile
  powerpc/mm: Fix makefile for KASAN
  powerpc/kasan: add missing/lost Makefile
  selftests/powerpc: Add a signal fuzzer selftest
  powerpc/booke64: set RI in default MSR
  ocxl: Provide global MMIO accessors for external drivers
  ocxl: move event_fd handling to frontend
  ocxl: afu_irq only deals with IRQ IDs, not offsets
  ocxl: Allow external drivers to use OpenCAPI contexts
  ocxl: Create a clear delineation between ocxl backend & frontend
  ocxl: Don't pass pci_dev around
  ocxl: Split pci.c
  ocxl: Remove some unused exported symbols
  ocxl: Remove superfluous 'extern' from headers
  ocxl: read_pasid never returns an error, so make it void
  ...

1 files changed, 53 insertions, 41 deletions

diff --git a/drivers/misc/ocxl/ocxl_internal.h b/drivers/misc/ocxl/ocxl_internal.h
index a32f2151029f..97415afd79f3 100644
--- a/drivers/misc/ocxl/ocxl_internal.h
+++ b/drivers/misc/ocxl/ocxl_internal.h
@@ -11,12 +11,8 @@
 #define MAX_IRQ_PER_LINK	2000
 #define MAX_IRQ_PER_CONTEXT	MAX_IRQ_PER_LINK
 
-#define to_ocxl_function(d) container_of(d, struct ocxl_fn, dev)
-#define to_ocxl_afu(d) container_of(d, struct ocxl_afu, dev)
-
 extern struct pci_driver ocxl_pci_driver;
 
-
 struct ocxl_fn {
 	struct device dev;
 	int bar_used[3];
@@ -31,11 +27,17 @@ struct ocxl_fn {
 	void *link;
 };
 
+struct ocxl_file_info {
+	struct ocxl_afu *afu;
+	struct device dev;
+	struct cdev cdev;
+	struct bin_attribute attr_global_mmio;
+};
+
 struct ocxl_afu {
+	struct kref kref;
 	struct ocxl_fn *fn;
 	struct list_head list;
-	struct device dev;
-	struct cdev cdev;
 	struct ocxl_afu_config config;
 	int pasid_base;
 	int pasid_count; /* opened contexts */
@@ -49,7 +51,7 @@ struct ocxl_afu {
 	u64 irq_base_offset;
 	void __iomem *global_mmio_ptr;
 	u64 pp_mmio_start;
-	struct bin_attribute attr_global_mmio;
+	void *private;
 };
 
 enum ocxl_context_status {
@@ -92,41 +94,51 @@ struct ocxl_process_element {
 	__be32 software_state;
 };
 
+int ocxl_create_cdev(struct ocxl_afu *afu);
+void ocxl_destroy_cdev(struct ocxl_afu *afu);
+int ocxl_file_register_afu(struct ocxl_afu *afu);
+void ocxl_file_unregister_afu(struct ocxl_afu *afu);
+
+int ocxl_file_init(void);
+void ocxl_file_exit(void);
+
+int ocxl_pasid_afu_alloc(struct ocxl_fn *fn, u32 size);
+void ocxl_pasid_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
+int ocxl_actag_afu_alloc(struct ocxl_fn *fn, u32 size);
+void ocxl_actag_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
+
+/*
+ * Get the max PASID value that can be used by the function
+ */
+int ocxl_config_get_pasid_info(struct pci_dev *dev, int *count);
+
+/*
+ * Check if an AFU index is valid for the given function.
+ *
+ * AFU indexes can be sparse, so a driver should check all indexes up
+ * to the maximum found in the function description
+ */
+int ocxl_config_check_afu_index(struct pci_dev *dev,
+				struct ocxl_fn_config *fn, int afu_idx);
+
+/**
+ * Update values within a Process Element
+ *
+ * link_handle: the link handle associated with the process element
+ * pasid: the PASID for the AFU context
+ * tid: the new thread id for the process element
+ */
+int ocxl_link_update_pe(void *link_handle, int pasid, __u16 tid);
+
+int ocxl_context_mmap(struct ocxl_context *ctx,
+			struct vm_area_struct *vma);
+void ocxl_context_detach_all(struct ocxl_afu *afu);
 
-extern struct ocxl_afu *ocxl_afu_get(struct ocxl_afu *afu);
-extern void ocxl_afu_put(struct ocxl_afu *afu);
-
-extern int ocxl_create_cdev(struct ocxl_afu *afu);
-extern void ocxl_destroy_cdev(struct ocxl_afu *afu);
-extern int ocxl_register_afu(struct ocxl_afu *afu);
-extern void ocxl_unregister_afu(struct ocxl_afu *afu);
-
-extern int ocxl_file_init(void);
-extern void ocxl_file_exit(void);
-
-extern int ocxl_pasid_afu_alloc(struct ocxl_fn *fn, u32 size);
-extern void ocxl_pasid_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
-extern int ocxl_actag_afu_alloc(struct ocxl_fn *fn, u32 size);
-extern void ocxl_actag_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
+int ocxl_sysfs_register_afu(struct ocxl_file_info *info);
+void ocxl_sysfs_unregister_afu(struct ocxl_file_info *info);
 
-extern struct ocxl_context *ocxl_context_alloc(void);
-extern int ocxl_context_init(struct ocxl_context *ctx, struct ocxl_afu *afu,
-			struct address_space *mapping);
-extern int ocxl_context_attach(struct ocxl_context *ctx, u64 amr);
-extern int ocxl_context_mmap(struct ocxl_context *ctx,
-			struct vm_area_struct *vma);
-extern int ocxl_context_detach(struct ocxl_context *ctx);
-extern void ocxl_context_detach_all(struct ocxl_afu *afu);
-extern void ocxl_context_free(struct ocxl_context *ctx);
-
-extern int ocxl_sysfs_add_afu(struct ocxl_afu *afu);
-extern void ocxl_sysfs_remove_afu(struct ocxl_afu *afu);
-
-extern int ocxl_afu_irq_alloc(struct ocxl_context *ctx, u64 *irq_offset);
-extern int ocxl_afu_irq_free(struct ocxl_context *ctx, u64 irq_offset);
-extern void ocxl_afu_irq_free_all(struct ocxl_context *ctx);
-extern int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, u64 irq_offset,
-			int eventfd);
-extern u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, u64 irq_offset);
+int ocxl_irq_offset_to_id(struct ocxl_context *ctx, u64 offset);
+u64 ocxl_irq_id_to_offset(struct ocxl_context *ctx, int irq_id);
+void ocxl_afu_irq_free_all(struct ocxl_context *ctx);
 
 #endif /* _OCXL_INTERNAL_H_ */