Merge tag 'powerpc-4.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc updates from Michael Ellerman:
 "A bit of a small release, I suspect in part due to me travelling for
  KS. But my backlog of patches to review is smaller than usual, so I
  think in part folks just didn't send as much this cycle.

  Non-highlights:

   - Five fixes for the >128T address space handling, both to fix bugs
     in our implementation and to bring the semantics exactly into line
     with x86.

  Highlights:

   - Support for a new OPAL call on bare metal machines which gives us a
     true NMI (ie. is not masked by MSR[EE]=0) for debugging etc.

   - Support for Power9 DD2 in the CXL driver.

   - Improvements to machine check handling so that uncorrectable errors
     can be reported into the generic memory_failure() machinery.

   - Some fixes and improvements for VPHN, which is used under PowerVM
     to notify the Linux partition of topology changes.

   - Plumbing to enable TM (transactional memory) without suspend on
     some Power9 processors (PPC_FEATURE2_HTM_NO_SUSPEND).

   - Support for emulating vector loads form cache-inhibited memory, on
     some Power9 revisions.

   - Disable the fast-endian switch "syscall" by default (behind a
     CONFIG), we believe it has never had any users.

   - A major rework of the API drivers use when initiating and waiting
     for long running operations performed by OPAL firmware, and changes
     to the powernv_flash driver to use the new API.

   - Several fixes for the handling of FP/VMX/VSX while processes are
     using transactional memory.

   - Optimisations of TLB range flushes when using the radix MMU on
     Power9.

   - Improvements to the VAS facility used to access coprocessors on
     Power9, and related improvements to the way the NX crypto driver
     handles requests.

   - Implementation of PMEM_API and UACCESS_FLUSHCACHE for 64-bit.

  Thanks to: Alexey Kardashevskiy, Alistair Popple, Allen Pais, Andrew
  Donnellan, Aneesh Kumar K.V, Arnd Bergmann, Balbir Singh, Benjamin
  Herrenschmidt, Breno Leitao, Christophe Leroy, Christophe Lombard,
  Cyril Bur, Frederic Barrat, Gautham R. Shenoy, Geert Uytterhoeven,
  Guilherme G. Piccoli, Gustavo Romero, Haren Myneni, Joel Stanley,
  Kamalesh Babulal, Kautuk Consul, Markus Elfring, Masami Hiramatsu,
  Michael Bringmann, Michael Neuling, Michal Suchanek, Naveen N. Rao,
  Nicholas Piggin, Oliver O'Halloran, Paul Mackerras, Pedro Miraglia
  Franco de Carvalho, Philippe Bergheaud, Sandipan Das, Seth Forshee,
  Shriya, Stephen Rothwell, Stewart Smith, Sukadev Bhattiprolu, Tyrel
  Datwyler, Vaibhav Jain, Vaidyanathan Srinivasan, and William A.
  Kennington III"

* tag 'powerpc-4.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (151 commits)
  powerpc/64s: Fix Power9 DD2.0 workarounds by adding DD2.1 feature
  powerpc/64s: Fix masking of SRR1 bits on instruction fault
  powerpc/64s: mm_context.addr_limit is only used on hash
  powerpc/64s/radix: Fix 128TB-512TB virtual address boundary case allocation
  powerpc/64s/hash: Allow MAP_FIXED allocations to cross 128TB boundary
  powerpc/64s/hash: Fix fork() with 512TB process address space
  powerpc/64s/hash: Fix 128TB-512TB virtual address boundary case allocation
  powerpc/64s/hash: Fix 512T hint detection to use >= 128T
  powerpc: Fix DABR match on hash based systems
  powerpc/signal: Properly handle return value from uprobe_deny_signal()
  powerpc/fadump: use kstrtoint to handle sysfs store
  powerpc/lib: Implement UACCESS_FLUSHCACHE API
  powerpc/lib: Implement PMEM API
  powerpc/powernv/npu: Don't explicitly flush nmmu tlb
  powerpc/powernv/npu: Use flush_all_mm() instead of flush_tlb_mm()
  powerpc/powernv/idle: Round up latency and residency values
  powerpc/kprobes: refactor kprobe_lookup_name for safer string operations
  powerpc/kprobes: Blacklist emulate_update_regs() from kprobes
  powerpc/kprobes: Do not disable interrupts for optprobes and kprobes_on_ftrace
  powerpc/kprobes: Disable preemption before invoking probe handler for optprobes
  ...

2 files changed, 14 insertions, 9 deletions

diff --git a/arch/powerpc/net/bpf_jit64.h b/arch/powerpc/net/bpf_jit64.h
index 62fa7589db2b..8bdef7ed28a8 100644
--- a/arch/powerpc/net/bpf_jit64.h
+++ b/arch/powerpc/net/bpf_jit64.h
@@ -23,7 +23,7 @@
  *		[   nv gpr save area	] 8*8		|
  *		[    tail_call_cnt	] 8		|
  *		[    local_tmp_var	] 8		|
- * fp (r31) -->	[   ebpf stack space	] 512		|
+ * fp (r31) -->	[   ebpf stack space	] upto 512	|
  *		[     frame header	] 32/112	|
  * sp (r1) --->	[    stack pointer	] --------------
  */
@@ -32,8 +32,8 @@
 #define BPF_PPC_STACK_SAVE	(8*8)
 /* for bpf JIT code internal usage */
 #define BPF_PPC_STACK_LOCALS	16
-/* Ensure this is quadword aligned */
-#define BPF_PPC_STACKFRAME	(STACK_FRAME_MIN_SIZE + MAX_BPF_STACK + \
+/* stack frame excluding BPF stack, ensure this is quadword aligned */
+#define BPF_PPC_STACKFRAME	(STACK_FRAME_MIN_SIZE + \
 				 BPF_PPC_STACK_LOCALS + BPF_PPC_STACK_SAVE)
 
 #ifndef __ASSEMBLY__
@@ -103,6 +103,7 @@ struct codegen_context {
 	 */
 	unsigned int seen;
 	unsigned int idx;
+	unsigned int stack_size;
 };
 
 #endif /* !__ASSEMBLY__ */
diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c
index a66e64b0b251..46d74e81aff1 100644
--- a/arch/powerpc/net/bpf_jit_comp64.c
+++ b/arch/powerpc/net/bpf_jit_comp64.c
@@ -69,7 +69,7 @@ static inline bool bpf_has_stack_frame(struct codegen_context *ctx)
 static int bpf_jit_stack_local(struct codegen_context *ctx)
 {
 	if (bpf_has_stack_frame(ctx))
-		return STACK_FRAME_MIN_SIZE + MAX_BPF_STACK;
+		return STACK_FRAME_MIN_SIZE + ctx->stack_size;
 	else
 		return -(BPF_PPC_STACK_SAVE + 16);
 }
@@ -82,8 +82,9 @@ static int bpf_jit_stack_tailcallcnt(struct codegen_context *ctx)
 static int bpf_jit_stack_offsetof(struct codegen_context *ctx, int reg)
 {
 	if (reg >= BPF_PPC_NVR_MIN && reg < 32)
-		return (bpf_has_stack_frame(ctx) ? BPF_PPC_STACKFRAME : 0)
-							- (8 * (32 - reg));
+		return (bpf_has_stack_frame(ctx) ?
+			(BPF_PPC_STACKFRAME + ctx->stack_size) : 0)
+				- (8 * (32 - reg));
 
 	pr_err("BPF JIT is asking about unknown registers");
 	BUG();
@@ -134,7 +135,7 @@ static void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx)
 			PPC_BPF_STL(0, 1, PPC_LR_STKOFF);
 		}
 
-		PPC_BPF_STLU(1, 1, -BPF_PPC_STACKFRAME);
+		PPC_BPF_STLU(1, 1, -(BPF_PPC_STACKFRAME + ctx->stack_size));
 	}
 
 	/*
@@ -161,7 +162,7 @@ static void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx)
 	/* Setup frame pointer to point to the bpf stack area */
 	if (bpf_is_seen_register(ctx, BPF_REG_FP))
 		PPC_ADDI(b2p[BPF_REG_FP], 1,
-				STACK_FRAME_MIN_SIZE + MAX_BPF_STACK);
+				STACK_FRAME_MIN_SIZE + ctx->stack_size);
 }
 
 static void bpf_jit_emit_common_epilogue(u32 *image, struct codegen_context *ctx)
@@ -183,7 +184,7 @@ static void bpf_jit_emit_common_epilogue(u32 *image, struct codegen_context *ctx
 
 	/* Tear down our stack frame */
 	if (bpf_has_stack_frame(ctx)) {
-		PPC_ADDI(1, 1, BPF_PPC_STACKFRAME);
+		PPC_ADDI(1, 1, BPF_PPC_STACKFRAME + ctx->stack_size);
 		if (ctx->seen & SEEN_FUNC) {
 			PPC_BPF_LL(0, 1, PPC_LR_STKOFF);
 			PPC_MTLR(0);
@@ -1013,6 +1014,9 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
 
 	memset(&cgctx, 0, sizeof(struct codegen_context));
 
+	/* Make sure that the stack is quadword aligned. */
+	cgctx.stack_size = round_up(fp->aux->stack_depth, 16);
+
 	/* Scouting faux-generate pass 0 */
 	if (bpf_jit_build_body(fp, 0, &cgctx, addrs)) {
 		/* We hit something illegal or unsupported. */