[PATCH 0/7] powerpc/watchpoint: 2nd DAWR kvm enablement + selftests

[PATCH 0/7] powerpc/watchpoint: 2nd DAWR kvm enablement + selftests

[Ravi Bangoria]

Patch #1, #2 and #3 enables p10 2nd DAWR feature for Book3S kvm guest. DAWR
is a hypervisor resource and thus H_SET_MODE hcall is used to set/unset it.
A new case H_SET_MODE_RESOURCE_SET_DAWR1 is introduced in H_SET_MODE hcall
for setting/unsetting 2nd DAWR. Also, new capability KVM_CAP_PPC_DAWR1 has
been added to query 2nd DAWR support via kvm ioctl.

This feature also needs to be enabled in Qemu to really use it. I'll reply
link to qemu patches once I post them in qemu-devel mailing list.

Patch #4, #5, #6 and #7 adds selftests to test 2nd DAWR.

Dependency:
  1: p10 kvm base enablement
     https://lore.kernel.org/linuxppc-dev/20200602055325.6102-1-alistair@popple.id.au

  2: 2nd DAWR powervm/baremetal enablement
     https://lore.kernel.org/linuxppc-dev/20200723090813.303838-1-ravi.bangoria@linux.ibm.com

  3: ptrace PPC_DEBUG_FEATURE_DATA_BP_DAWR_ARCH_31 flag
     https://lore.kernel.org/linuxppc-dev/20200723093330.306341-1-ravi.bangoria@linux.ibm.com

Patches in this series applies fine on top of powerpc/next (9a77c4a0a125)
plus above dependency patches.

Ravi Bangoria (7):
  powerpc/watchpoint/kvm: Rename current DAWR macros and variables
  powerpc/watchpoint/kvm: Add infrastructure to support 2nd DAWR
  powerpc/watchpoint/kvm: Introduce new capability for 2nd DAWR
  powerpc/selftests/ptrace-hwbreak: Add testcases for 2nd DAWR
  powerpc/selftests/perf-hwbreak: Coalesce event creation code
  powerpc/selftests/perf-hwbreak: Add testcases for 2nd DAWR
  powerpc/selftests: Add selftest to test concurrent perf/ptrace events

 Documentation/virt/kvm/api.rst                |   6 +-
 arch/powerpc/include/asm/hvcall.h             |   2 +
 arch/powerpc/include/asm/kvm_host.h           |   6 +-
 arch/powerpc/include/uapi/asm/kvm.h           |   8 +-
 arch/powerpc/kernel/asm-offsets.c             |   6 +-
 arch/powerpc/kvm/book3s_hv.c                  |  73 +-
 arch/powerpc/kvm/book3s_hv_nested.c           |  15 +-
 arch/powerpc/kvm/book3s_hv_rmhandlers.S       |  43 +-
 arch/powerpc/kvm/powerpc.c                    |   3 +
 include/uapi/linux/kvm.h                      |   1 +
 tools/arch/powerpc/include/uapi/asm/kvm.h     |   8 +-
 .../selftests/powerpc/ptrace/.gitignore       |   1 +
 .../testing/selftests/powerpc/ptrace/Makefile |   2 +-
 .../selftests/powerpc/ptrace/perf-hwbreak.c   | 646 +++++++++++++++--
 .../selftests/powerpc/ptrace/ptrace-hwbreak.c |  79 +++
 .../powerpc/ptrace/ptrace-perf-hwbreak.c      | 659 ++++++++++++++++++
 16 files changed, 1476 insertions(+), 82 deletions(-)
 create mode 100644 tools/testing/selftests/powerpc/ptrace/ptrace-perf-hwbreak.c

-- 
2.26.2

[PATCH 1/7] powerpc/watchpoint/kvm: Rename current DAWR macros and variables

[Ravi Bangoria]

Power10 is introducing second DAWR. Use real register names (with
suffix 0) from ISA for current macros and variables used by kvm.

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
---
 Documentation/virt/kvm/api.rst            |  4 +--
 arch/powerpc/include/asm/kvm_host.h       |  4 +--
 arch/powerpc/include/uapi/asm/kvm.h       |  4 +--
 arch/powerpc/kernel/asm-offsets.c         |  4 +--
 arch/powerpc/kvm/book3s_hv.c              | 32 +++++++++++------------
 arch/powerpc/kvm/book3s_hv_nested.c       |  8 +++---
 arch/powerpc/kvm/book3s_hv_rmhandlers.S   | 20 +++++++-------
 tools/arch/powerpc/include/uapi/asm/kvm.h |  4 +--
 8 files changed, 40 insertions(+), 40 deletions(-)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 426f94582b7a..4dc18fe6a2bf 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -2219,8 +2219,8 @@ registers, find a list below:
   PPC     KVM_REG_PPC_BESCR               64
   PPC     KVM_REG_PPC_TAR                 64
   PPC     KVM_REG_PPC_DPDES               64
-  PPC     KVM_REG_PPC_DAWR                64
-  PPC     KVM_REG_PPC_DAWRX               64
+  PPC     KVM_REG_PPC_DAWR0               64
+  PPC     KVM_REG_PPC_DAWRX0              64
   PPC     KVM_REG_PPC_CIABR               64
   PPC     KVM_REG_PPC_IC                  64
   PPC     KVM_REG_PPC_VTB                 64
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 7e2d061d0445..9aa3854f0e1e 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -582,8 +582,8 @@ struct kvm_vcpu_arch {
 	u32 ctrl;
 	u32 dabrx;
 	ulong dabr;
-	ulong dawr;
-	ulong dawrx;
+	ulong dawr0;
+	ulong dawrx0;
 	ulong ciabr;
 	ulong cfar;
 	ulong ppr;
diff --git a/arch/powerpc/include/uapi/asm/kvm.h b/arch/powerpc/include/uapi/asm/kvm.h
index 264e266a85bf..38d61b73f5ed 100644
--- a/arch/powerpc/include/uapi/asm/kvm.h
+++ b/arch/powerpc/include/uapi/asm/kvm.h
@@ -608,8 +608,8 @@ struct kvm_ppc_cpu_char {
 #define KVM_REG_PPC_BESCR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xa7)
 #define KVM_REG_PPC_TAR		(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xa8)
 #define KVM_REG_PPC_DPDES	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xa9)
-#define KVM_REG_PPC_DAWR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xaa)
-#define KVM_REG_PPC_DAWRX	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xab)
+#define KVM_REG_PPC_DAWR0	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xaa)
+#define KVM_REG_PPC_DAWRX0	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xab)
 #define KVM_REG_PPC_CIABR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xac)
 #define KVM_REG_PPC_IC		(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xad)
 #define KVM_REG_PPC_VTB		(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xae)
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 6657dc6b2336..e76bffe348e1 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -547,8 +547,8 @@ int main(void)
 	OFFSET(VCPU_CTRL, kvm_vcpu, arch.ctrl);
 	OFFSET(VCPU_DABR, kvm_vcpu, arch.dabr);
 	OFFSET(VCPU_DABRX, kvm_vcpu, arch.dabrx);
-	OFFSET(VCPU_DAWR, kvm_vcpu, arch.dawr);
-	OFFSET(VCPU_DAWRX, kvm_vcpu, arch.dawrx);
+	OFFSET(VCPU_DAWR0, kvm_vcpu, arch.dawr0);
+	OFFSET(VCPU_DAWRX0, kvm_vcpu, arch.dawrx0);
 	OFFSET(VCPU_CIABR, kvm_vcpu, arch.ciabr);
 	OFFSET(VCPU_HFLAGS, kvm_vcpu, arch.hflags);
 	OFFSET(VCPU_DEC, kvm_vcpu, arch.dec);
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 89afcc5f60ca..28200e4f5d27 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -778,8 +778,8 @@ static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
 			return H_UNSUPPORTED_FLAG_START;
 		if (value2 & DABRX_HYP)
 			return H_P4;
-		vcpu->arch.dawr  = value1;
-		vcpu->arch.dawrx = value2;
+		vcpu->arch.dawr0  = value1;
+		vcpu->arch.dawrx0 = value2;
 		return H_SUCCESS;
 	case H_SET_MODE_RESOURCE_ADDR_TRANS_MODE:
 		/* KVM does not support mflags=2 (AIL=2) */
@@ -1724,11 +1724,11 @@ static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
 	case KVM_REG_PPC_VTB:
 		*val = get_reg_val(id, vcpu->arch.vcore->vtb);
 		break;
-	case KVM_REG_PPC_DAWR:
-		*val = get_reg_val(id, vcpu->arch.dawr);
+	case KVM_REG_PPC_DAWR0:
+		*val = get_reg_val(id, vcpu->arch.dawr0);
 		break;
-	case KVM_REG_PPC_DAWRX:
-		*val = get_reg_val(id, vcpu->arch.dawrx);
+	case KVM_REG_PPC_DAWRX0:
+		*val = get_reg_val(id, vcpu->arch.dawrx0);
 		break;
 	case KVM_REG_PPC_CIABR:
 		*val = get_reg_val(id, vcpu->arch.ciabr);
@@ -1938,11 +1938,11 @@ static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
 	case KVM_REG_PPC_VTB:
 		vcpu->arch.vcore->vtb = set_reg_val(id, *val);
 		break;
-	case KVM_REG_PPC_DAWR:
-		vcpu->arch.dawr = set_reg_val(id, *val);
+	case KVM_REG_PPC_DAWR0:
+		vcpu->arch.dawr0 = set_reg_val(id, *val);
 		break;
-	case KVM_REG_PPC_DAWRX:
-		vcpu->arch.dawrx = set_reg_val(id, *val) & ~DAWRX_HYP;
+	case KVM_REG_PPC_DAWRX0:
+		vcpu->arch.dawrx0 = set_reg_val(id, *val) & ~DAWRX_HYP;
 		break;
 	case KVM_REG_PPC_CIABR:
 		vcpu->arch.ciabr = set_reg_val(id, *val);
@@ -3397,8 +3397,8 @@ static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
 	int trap;
 	unsigned long host_hfscr = mfspr(SPRN_HFSCR);
 	unsigned long host_ciabr = mfspr(SPRN_CIABR);
-	unsigned long host_dawr = mfspr(SPRN_DAWR0);
-	unsigned long host_dawrx = mfspr(SPRN_DAWRX0);
+	unsigned long host_dawr0 = mfspr(SPRN_DAWR0);
+	unsigned long host_dawrx0 = mfspr(SPRN_DAWRX0);
 	unsigned long host_psscr = mfspr(SPRN_PSSCR);
 	unsigned long host_pidr = mfspr(SPRN_PID);
 
@@ -3427,8 +3427,8 @@ static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
 	mtspr(SPRN_SPURR, vcpu->arch.spurr);
 
 	if (dawr_enabled()) {
-		mtspr(SPRN_DAWR0, vcpu->arch.dawr);
-		mtspr(SPRN_DAWRX0, vcpu->arch.dawrx);
+		mtspr(SPRN_DAWR0, vcpu->arch.dawr0);
+		mtspr(SPRN_DAWRX0, vcpu->arch.dawrx0);
 	}
 	mtspr(SPRN_CIABR, vcpu->arch.ciabr);
 	mtspr(SPRN_IC, vcpu->arch.ic);
@@ -3480,8 +3480,8 @@ static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
 	      (local_paca->kvm_hstate.fake_suspend << PSSCR_FAKE_SUSPEND_LG));
 	mtspr(SPRN_HFSCR, host_hfscr);
 	mtspr(SPRN_CIABR, host_ciabr);
-	mtspr(SPRN_DAWR0, host_dawr);
-	mtspr(SPRN_DAWRX0, host_dawrx);
+	mtspr(SPRN_DAWR0, host_dawr0);
+	mtspr(SPRN_DAWRX0, host_dawrx0);
 	mtspr(SPRN_PID, host_pidr);
 
 	/*
diff --git a/arch/powerpc/kvm/book3s_hv_nested.c b/arch/powerpc/kvm/book3s_hv_nested.c
index 2c849a65db77..629f74edab22 100644
--- a/arch/powerpc/kvm/book3s_hv_nested.c
+++ b/arch/powerpc/kvm/book3s_hv_nested.c
@@ -33,8 +33,8 @@ void kvmhv_save_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr)
 	hr->dpdes = vc->dpdes;
 	hr->hfscr = vcpu->arch.hfscr;
 	hr->tb_offset = vc->tb_offset;
-	hr->dawr0 = vcpu->arch.dawr;
-	hr->dawrx0 = vcpu->arch.dawrx;
+	hr->dawr0 = vcpu->arch.dawr0;
+	hr->dawrx0 = vcpu->arch.dawrx0;
 	hr->ciabr = vcpu->arch.ciabr;
 	hr->purr = vcpu->arch.purr;
 	hr->spurr = vcpu->arch.spurr;
@@ -151,8 +151,8 @@ static void restore_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr)
 	vc->pcr = hr->pcr | PCR_MASK;
 	vc->dpdes = hr->dpdes;
 	vcpu->arch.hfscr = hr->hfscr;
-	vcpu->arch.dawr = hr->dawr0;
-	vcpu->arch.dawrx = hr->dawrx0;
+	vcpu->arch.dawr0 = hr->dawr0;
+	vcpu->arch.dawrx0 = hr->dawrx0;
 	vcpu->arch.ciabr = hr->ciabr;
 	vcpu->arch.purr = hr->purr;
 	vcpu->arch.spurr = hr->spurr;
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index 71943892c81c..e562a9acbc2a 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -52,8 +52,8 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300)
 #define STACK_SLOT_PID		(SFS-32)
 #define STACK_SLOT_IAMR		(SFS-40)
 #define STACK_SLOT_CIABR	(SFS-48)
-#define STACK_SLOT_DAWR		(SFS-56)
-#define STACK_SLOT_DAWRX	(SFS-64)
+#define STACK_SLOT_DAWR0	(SFS-56)
+#define STACK_SLOT_DAWRX0	(SFS-64)
 #define STACK_SLOT_HFSCR	(SFS-72)
 #define STACK_SLOT_AMR		(SFS-80)
 #define STACK_SLOT_UAMOR	(SFS-88)
@@ -711,8 +711,8 @@ BEGIN_FTR_SECTION
 	mfspr	r7, SPRN_DAWRX0
 	mfspr	r8, SPRN_IAMR
 	std	r5, STACK_SLOT_CIABR(r1)
-	std	r6, STACK_SLOT_DAWR(r1)
-	std	r7, STACK_SLOT_DAWRX(r1)
+	std	r6, STACK_SLOT_DAWR0(r1)
+	std	r7, STACK_SLOT_DAWRX0(r1)
 	std	r8, STACK_SLOT_IAMR(r1)
 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
 
@@ -801,8 +801,8 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
 	lbz	r5, 0(r5)
 	cmpdi	r5, 0
 	beq	1f
-	ld	r5, VCPU_DAWR(r4)
-	ld	r6, VCPU_DAWRX(r4)
+	ld	r5, VCPU_DAWR0(r4)
+	ld	r6, VCPU_DAWRX0(r4)
 	mtspr	SPRN_DAWR0, r5
 	mtspr	SPRN_DAWRX0, r6
 1:
@@ -1759,8 +1759,8 @@ END_FTR_SECTION(CPU_FTR_TM | CPU_FTR_P9_TM_HV_ASSIST, 0)
 	/* Restore host values of some registers */
 BEGIN_FTR_SECTION
 	ld	r5, STACK_SLOT_CIABR(r1)
-	ld	r6, STACK_SLOT_DAWR(r1)
-	ld	r7, STACK_SLOT_DAWRX(r1)
+	ld	r6, STACK_SLOT_DAWR0(r1)
+	ld	r7, STACK_SLOT_DAWRX0(r1)
 	mtspr	SPRN_CIABR, r5
 	/*
 	 * If the DAWR doesn't work, it's ok to write these here as
@@ -2566,8 +2566,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
 	rlwimi	r5, r4, 5, DAWRX_DR | DAWRX_DW
 	rlwimi	r5, r4, 2, DAWRX_WT
 	clrrdi	r4, r4, 3
-	std	r4, VCPU_DAWR(r3)
-	std	r5, VCPU_DAWRX(r3)
+	std	r4, VCPU_DAWR0(r3)
+	std	r5, VCPU_DAWRX0(r3)
 	/*
 	 * If came in through the real mode hcall handler then it is necessary
 	 * to write the registers since the return path won't. Otherwise it is
diff --git a/tools/arch/powerpc/include/uapi/asm/kvm.h b/tools/arch/powerpc/include/uapi/asm/kvm.h
index 264e266a85bf..38d61b73f5ed 100644
--- a/tools/arch/powerpc/include/uapi/asm/kvm.h
+++ b/tools/arch/powerpc/include/uapi/asm/kvm.h
@@ -608,8 +608,8 @@ struct kvm_ppc_cpu_char {
 #define KVM_REG_PPC_BESCR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xa7)
 #define KVM_REG_PPC_TAR		(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xa8)
 #define KVM_REG_PPC_DPDES	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xa9)
-#define KVM_REG_PPC_DAWR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xaa)
-#define KVM_REG_PPC_DAWRX	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xab)
+#define KVM_REG_PPC_DAWR0	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xaa)
+#define KVM_REG_PPC_DAWRX0	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xab)
 #define KVM_REG_PPC_CIABR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xac)
 #define KVM_REG_PPC_IC		(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xad)
 #define KVM_REG_PPC_VTB		(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xae)
-- 
2.26.2

[PATCH 2/7] powerpc/watchpoint/kvm: Add infrastructure to support 2nd DAWR

[Ravi Bangoria]

kvm code assumes single DAWR everywhere. Add code to support 2nd DAWR.
DAWR is a hypervisor resource and thus H_SET_MODE hcall is used to set/
unset it. Introduce new case H_SET_MODE_RESOURCE_SET_DAWR1 for 2nd DAWR.
Also, kvm will support 2nd DAWR only if CPU_FTR_DAWR1 is set.

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
---
 Documentation/virt/kvm/api.rst            |  2 ++
 arch/powerpc/include/asm/hvcall.h         |  2 ++
 arch/powerpc/include/asm/kvm_host.h       |  2 ++
 arch/powerpc/include/uapi/asm/kvm.h       |  4 +++
 arch/powerpc/kernel/asm-offsets.c         |  2 ++
 arch/powerpc/kvm/book3s_hv.c              | 41 +++++++++++++++++++++++
 arch/powerpc/kvm/book3s_hv_nested.c       |  7 ++++
 arch/powerpc/kvm/book3s_hv_rmhandlers.S   | 23 +++++++++++++
 tools/arch/powerpc/include/uapi/asm/kvm.h |  4 +++
 9 files changed, 87 insertions(+)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 4dc18fe6a2bf..7b1d16c2ad24 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -2242,6 +2242,8 @@ registers, find a list below:
   PPC     KVM_REG_PPC_PSSCR               64
   PPC     KVM_REG_PPC_DEC_EXPIRY          64
   PPC     KVM_REG_PPC_PTCR                64
+  PPC     KVM_REG_PPC_DAWR1               64
+  PPC     KVM_REG_PPC_DAWRX1              64
   PPC     KVM_REG_PPC_TM_GPR0             64
   ...
   PPC     KVM_REG_PPC_TM_GPR31            64
diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h
index 33793444144c..03f401d7be41 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -538,6 +538,8 @@ struct hv_guest_state {
 	s64 tb_offset;
 	u64 dawr0;
 	u64 dawrx0;
+	u64 dawr1;
+	u64 dawrx1;
 	u64 ciabr;
 	u64 hdec_expiry;
 	u64 purr;
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 9aa3854f0e1e..bda839edd5fe 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -584,6 +584,8 @@ struct kvm_vcpu_arch {
 	ulong dabr;
 	ulong dawr0;
 	ulong dawrx0;
+	ulong dawr1;
+	ulong dawrx1;
 	ulong ciabr;
 	ulong cfar;
 	ulong ppr;
diff --git a/arch/powerpc/include/uapi/asm/kvm.h b/arch/powerpc/include/uapi/asm/kvm.h
index 38d61b73f5ed..c5c0f128b46f 100644
--- a/arch/powerpc/include/uapi/asm/kvm.h
+++ b/arch/powerpc/include/uapi/asm/kvm.h
@@ -640,6 +640,10 @@ struct kvm_ppc_cpu_char {
 #define KVM_REG_PPC_ONLINE	(KVM_REG_PPC | KVM_REG_SIZE_U32 | 0xbf)
 #define KVM_REG_PPC_PTCR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc0)
 
+/* POWER10 registers. */
+#define KVM_REG_PPC_DAWR1	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc1)
+#define KVM_REG_PPC_DAWRX1	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc2)
+
 /* Transactional Memory checkpointed state:
  * This is all GPRs, all VSX regs and a subset of SPRs
  */
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index e76bffe348e1..ef2c0f3f5a7b 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -549,6 +549,8 @@ int main(void)
 	OFFSET(VCPU_DABRX, kvm_vcpu, arch.dabrx);
 	OFFSET(VCPU_DAWR0, kvm_vcpu, arch.dawr0);
 	OFFSET(VCPU_DAWRX0, kvm_vcpu, arch.dawrx0);
+	OFFSET(VCPU_DAWR1, kvm_vcpu, arch.dawr1);
+	OFFSET(VCPU_DAWRX1, kvm_vcpu, arch.dawrx1);
 	OFFSET(VCPU_CIABR, kvm_vcpu, arch.ciabr);
 	OFFSET(VCPU_HFLAGS, kvm_vcpu, arch.hflags);
 	OFFSET(VCPU_DEC, kvm_vcpu, arch.dec);
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 28200e4f5d27..24575520b2ea 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -781,6 +781,20 @@ static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
 		vcpu->arch.dawr0  = value1;
 		vcpu->arch.dawrx0 = value2;
 		return H_SUCCESS;
+	case H_SET_MODE_RESOURCE_SET_DAWR1:
+		if (!kvmppc_power8_compatible(vcpu))
+			return H_P2;
+		if (!ppc_breakpoint_available())
+			return H_P2;
+		if (!cpu_has_feature(CPU_FTR_DAWR1))
+			return H_P2;
+		if (mflags)
+			return H_UNSUPPORTED_FLAG_START;
+		if (value2 & DABRX_HYP)
+			return H_P4;
+		vcpu->arch.dawr1  = value1;
+		vcpu->arch.dawrx1 = value2;
+		return H_SUCCESS;
 	case H_SET_MODE_RESOURCE_ADDR_TRANS_MODE:
 		/* KVM does not support mflags=2 (AIL=2) */
 		if (mflags != 0 && mflags != 3)
@@ -1730,6 +1744,12 @@ static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
 	case KVM_REG_PPC_DAWRX0:
 		*val = get_reg_val(id, vcpu->arch.dawrx0);
 		break;
+	case KVM_REG_PPC_DAWR1:
+		*val = get_reg_val(id, vcpu->arch.dawr1);
+		break;
+	case KVM_REG_PPC_DAWRX1:
+		*val = get_reg_val(id, vcpu->arch.dawrx1);
+		break;
 	case KVM_REG_PPC_CIABR:
 		*val = get_reg_val(id, vcpu->arch.ciabr);
 		break;
@@ -1944,6 +1964,12 @@ static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
 	case KVM_REG_PPC_DAWRX0:
 		vcpu->arch.dawrx0 = set_reg_val(id, *val) & ~DAWRX_HYP;
 		break;
+	case KVM_REG_PPC_DAWR1:
+		vcpu->arch.dawr1 = set_reg_val(id, *val);
+		break;
+	case KVM_REG_PPC_DAWRX1:
+		vcpu->arch.dawrx1 = set_reg_val(id, *val) & ~DAWRX_HYP;
+		break;
 	case KVM_REG_PPC_CIABR:
 		vcpu->arch.ciabr = set_reg_val(id, *val);
 		/* Don't allow setting breakpoints in hypervisor code */
@@ -3401,6 +3427,13 @@ static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
 	unsigned long host_dawrx0 = mfspr(SPRN_DAWRX0);
 	unsigned long host_psscr = mfspr(SPRN_PSSCR);
 	unsigned long host_pidr = mfspr(SPRN_PID);
+	unsigned long host_dawr1 = 0;
+	unsigned long host_dawrx1 = 0;
+
+	if (cpu_has_feature(CPU_FTR_DAWR1)) {
+		host_dawr1 = mfspr(SPRN_DAWR1);
+		host_dawrx1 = mfspr(SPRN_DAWRX1);
+	}
 
 	hdec = time_limit - mftb();
 	if (hdec < 0)
@@ -3429,6 +3462,10 @@ static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
 	if (dawr_enabled()) {
 		mtspr(SPRN_DAWR0, vcpu->arch.dawr0);
 		mtspr(SPRN_DAWRX0, vcpu->arch.dawrx0);
+		if (cpu_has_feature(CPU_FTR_DAWR1)) {
+			mtspr(SPRN_DAWR1, vcpu->arch.dawr1);
+			mtspr(SPRN_DAWRX1, vcpu->arch.dawrx1);
+		}
 	}
 	mtspr(SPRN_CIABR, vcpu->arch.ciabr);
 	mtspr(SPRN_IC, vcpu->arch.ic);
@@ -3482,6 +3519,10 @@ static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
 	mtspr(SPRN_CIABR, host_ciabr);
 	mtspr(SPRN_DAWR0, host_dawr0);
 	mtspr(SPRN_DAWRX0, host_dawrx0);
+	if (cpu_has_feature(CPU_FTR_DAWR1)) {
+		mtspr(SPRN_DAWR1, host_dawr1);
+		mtspr(SPRN_DAWRX1, host_dawrx1);
+	}
 	mtspr(SPRN_PID, host_pidr);
 
 	/*
diff --git a/arch/powerpc/kvm/book3s_hv_nested.c b/arch/powerpc/kvm/book3s_hv_nested.c
index 629f74edab22..03a3c7c5dc28 100644
--- a/arch/powerpc/kvm/book3s_hv_nested.c
+++ b/arch/powerpc/kvm/book3s_hv_nested.c
@@ -35,6 +35,8 @@ void kvmhv_save_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr)
 	hr->tb_offset = vc->tb_offset;
 	hr->dawr0 = vcpu->arch.dawr0;
 	hr->dawrx0 = vcpu->arch.dawrx0;
+	hr->dawr1 = vcpu->arch.dawr1;
+	hr->dawrx1 = vcpu->arch.dawrx1;
 	hr->ciabr = vcpu->arch.ciabr;
 	hr->purr = vcpu->arch.purr;
 	hr->spurr = vcpu->arch.spurr;
@@ -72,6 +74,8 @@ static void byteswap_hv_regs(struct hv_guest_state *hr)
 	hr->tb_offset = swab64(hr->tb_offset);
 	hr->dawr0 = swab64(hr->dawr0);
 	hr->dawrx0 = swab64(hr->dawrx0);
+	hr->dawr1 = swab64(hr->dawr1);
+	hr->dawrx1 = swab64(hr->dawrx1);
 	hr->ciabr = swab64(hr->ciabr);
 	hr->hdec_expiry = swab64(hr->hdec_expiry);
 	hr->purr = swab64(hr->purr);
@@ -138,6 +142,7 @@ static void sanitise_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr)
 
 	/* Don't let data address watchpoint match in hypervisor state */
 	hr->dawrx0 &= ~DAWRX_HYP;
+	hr->dawrx1 &= ~DAWRX_HYP;
 
 	/* Don't let completed instruction address breakpt match in HV state */
 	if ((hr->ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER)
@@ -153,6 +158,8 @@ static void restore_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr)
 	vcpu->arch.hfscr = hr->hfscr;
 	vcpu->arch.dawr0 = hr->dawr0;
 	vcpu->arch.dawrx0 = hr->dawrx0;
+	vcpu->arch.dawr1 = hr->dawr1;
+	vcpu->arch.dawrx1 = hr->dawrx1;
 	vcpu->arch.ciabr = hr->ciabr;
 	vcpu->arch.purr = hr->purr;
 	vcpu->arch.spurr = hr->spurr;
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index e562a9acbc2a..2006ec149532 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -57,6 +57,8 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300)
 #define STACK_SLOT_HFSCR	(SFS-72)
 #define STACK_SLOT_AMR		(SFS-80)
 #define STACK_SLOT_UAMOR	(SFS-88)
+#define STACK_SLOT_DAWR1	(SFS-96)
+#define STACK_SLOT_DAWRX1	(SFS-104)
 /* the following is used by the P9 short path */
 #define STACK_SLOT_NVGPRS	(SFS-152)	/* 18 gprs */
 
@@ -715,6 +717,12 @@ BEGIN_FTR_SECTION
 	std	r7, STACK_SLOT_DAWRX0(r1)
 	std	r8, STACK_SLOT_IAMR(r1)
 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
+BEGIN_FTR_SECTION
+	mfspr	r6, SPRN_DAWR1
+	mfspr	r7, SPRN_DAWRX1
+	std	r6, STACK_SLOT_DAWR1(r1)
+	std	r7, STACK_SLOT_DAWRX1(r1)
+END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S | CPU_FTR_DAWR1)
 
 	mfspr	r5, SPRN_AMR
 	std	r5, STACK_SLOT_AMR(r1)
@@ -805,6 +813,12 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
 	ld	r6, VCPU_DAWRX0(r4)
 	mtspr	SPRN_DAWR0, r5
 	mtspr	SPRN_DAWRX0, r6
+BEGIN_FTR_SECTION
+	ld	r5, VCPU_DAWR1(r4)
+	ld	r6, VCPU_DAWRX1(r4)
+	mtspr	SPRN_DAWR1, r5
+	mtspr	SPRN_DAWRX1, r6
+END_FTR_SECTION_IFSET(CPU_FTR_DAWR1)
 1:
 	ld	r7, VCPU_CIABR(r4)
 	ld	r8, VCPU_TAR(r4)
@@ -1769,6 +1783,12 @@ BEGIN_FTR_SECTION
 	mtspr	SPRN_DAWR0, r6
 	mtspr	SPRN_DAWRX0, r7
 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
+BEGIN_FTR_SECTION
+	ld	r6, STACK_SLOT_DAWR1(r1)
+	ld	r7, STACK_SLOT_DAWRX1(r1)
+	mtspr	SPRN_DAWR1, r6
+	mtspr	SPRN_DAWRX1, r7
+END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S | CPU_FTR_DAWR1)
 BEGIN_FTR_SECTION
 	ld	r5, STACK_SLOT_TID(r1)
 	ld	r6, STACK_SLOT_PSSCR(r1)
@@ -3335,6 +3355,9 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300)
 	mtspr	SPRN_IAMR, r0
 	mtspr	SPRN_CIABR, r0
 	mtspr	SPRN_DAWRX0, r0
+BEGIN_FTR_SECTION
+	mtspr	SPRN_DAWRX1, r0
+END_FTR_SECTION_IFSET(CPU_FTR_DAWR1)
 
 BEGIN_MMU_FTR_SECTION
 	b	4f
diff --git a/tools/arch/powerpc/include/uapi/asm/kvm.h b/tools/arch/powerpc/include/uapi/asm/kvm.h
index 38d61b73f5ed..c5c0f128b46f 100644
--- a/tools/arch/powerpc/include/uapi/asm/kvm.h
+++ b/tools/arch/powerpc/include/uapi/asm/kvm.h
@@ -640,6 +640,10 @@ struct kvm_ppc_cpu_char {
 #define KVM_REG_PPC_ONLINE	(KVM_REG_PPC | KVM_REG_SIZE_U32 | 0xbf)
 #define KVM_REG_PPC_PTCR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc0)
 
+/* POWER10 registers. */
+#define KVM_REG_PPC_DAWR1	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc1)
+#define KVM_REG_PPC_DAWRX1	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xc2)
+
 /* Transactional Memory checkpointed state:
  * This is all GPRs, all VSX regs and a subset of SPRs
  */
-- 
2.26.2

[PATCH 3/7] powerpc/watchpoint/kvm: Introduce new capability for 2nd DAWR

[Ravi Bangoria]

Introduce KVM_CAP_PPC_DAWR1 which can be used by Qemu to query whether
kvm supports 2nd DAWR or not.

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
---
 arch/powerpc/kvm/powerpc.c | 3 +++
 include/uapi/linux/kvm.h   | 1 +
 2 files changed, 4 insertions(+)

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index dd7d141e33e8..f38380fd1fe9 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -676,6 +676,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 			!kvmppc_hv_ops->enable_svm(NULL);
 		break;
 #endif
+	case KVM_CAP_PPC_DAWR1:
+		r = cpu_has_feature(CPU_FTR_DAWR1);
+		break;
 	default:
 		r = 0;
 		break;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 4fdf30316582..2c3713d6526a 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1031,6 +1031,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_PPC_SECURE_GUEST 181
 #define KVM_CAP_HALT_POLL 182
 #define KVM_CAP_ASYNC_PF_INT 183
+#define KVM_CAP_PPC_DAWR1 184
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
-- 
2.26.2

[PATCH 4/7] powerpc/selftests/ptrace-hwbreak: Add testcases for 2nd DAWR

[Ravi Bangoria]

Add selftests to test multiple active DAWRs with ptrace interface.

Sample o/p:
  $ ./ptrace-hwbreak
  ...
  PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW ALIGNED, WO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW UNALIGNED, RO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DAWR Overlap, WO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DAWR Overlap, RO, len: 6: Ok

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
---
 .../selftests/powerpc/ptrace/ptrace-hwbreak.c | 79 +++++++++++++++++++
 1 file changed, 79 insertions(+)

diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-hwbreak.c b/tools/testing/selftests/powerpc/ptrace/ptrace-hwbreak.c
index fc477dfe86a2..65781f4035c1 100644
--- a/tools/testing/selftests/powerpc/ptrace/ptrace-hwbreak.c
+++ b/tools/testing/selftests/powerpc/ptrace/ptrace-hwbreak.c
@@ -185,6 +185,18 @@ static void test_workload(void)
 		big_var[rand() % DAWR_MAX_LEN] = 'a';
 	else
 		cvar = big_var[rand() % DAWR_MAX_LEN];
+
+	/* PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW ALIGNED, WO test */
+	gstruct.a[rand() % A_LEN] = 'a';
+
+	/* PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW UNALIGNED, RO test */
+	cvar = gstruct.b[rand() % B_LEN];
+
+	/* PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DAWR Overlap, WO test */
+	gstruct.a[rand() % A_LEN] = 'a';
+
+	/* PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DAWR Overlap, RO test */
+	cvar = gstruct.a[rand() % A_LEN];
 }
 
 static void check_success(pid_t child_pid, const char *name, const char *type,
@@ -374,6 +386,69 @@ static void test_sethwdebug_range_aligned(pid_t child_pid)
 	ptrace_delhwdebug(child_pid, wh);
 }
 
+static void test_multi_sethwdebug_range(pid_t child_pid)
+{
+	struct ppc_hw_breakpoint info1, info2;
+	unsigned long wp_addr1, wp_addr2;
+	char *name1 = "PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW ALIGNED";
+	char *name2 = "PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW UNALIGNED";
+	int len1, len2;
+	int wh1, wh2;
+
+	wp_addr1 = (unsigned long)&gstruct.a;
+	wp_addr2 = (unsigned long)&gstruct.b;
+	len1 = A_LEN;
+	len2 = B_LEN;
+	get_ppc_hw_breakpoint(&info1, PPC_BREAKPOINT_TRIGGER_WRITE, wp_addr1, len1);
+	get_ppc_hw_breakpoint(&info2, PPC_BREAKPOINT_TRIGGER_READ, wp_addr2, len2);
+
+	/* PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW ALIGNED, WO test */
+	wh1 = ptrace_sethwdebug(child_pid, &info1);
+
+	/* PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW UNALIGNED, RO test */
+	wh2 = ptrace_sethwdebug(child_pid, &info2);
+
+	ptrace(PTRACE_CONT, child_pid, NULL, 0);
+	check_success(child_pid, name1, "WO", wp_addr1, len1);
+
+	ptrace(PTRACE_CONT, child_pid, NULL, 0);
+	check_success(child_pid, name2, "RO", wp_addr2, len2);
+
+	ptrace_delhwdebug(child_pid, wh1);
+	ptrace_delhwdebug(child_pid, wh2);
+}
+
+static void test_multi_sethwdebug_range_dawr_overlap(pid_t child_pid)
+{
+	struct ppc_hw_breakpoint info1, info2;
+	unsigned long wp_addr1, wp_addr2;
+	char *name = "PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DAWR Overlap";
+	int len1, len2;
+	int wh1, wh2;
+
+	wp_addr1 = (unsigned long)&gstruct.a;
+	wp_addr2 = (unsigned long)&gstruct.a;
+	len1 = A_LEN;
+	len2 = A_LEN;
+	get_ppc_hw_breakpoint(&info1, PPC_BREAKPOINT_TRIGGER_WRITE, wp_addr1, len1);
+	get_ppc_hw_breakpoint(&info2, PPC_BREAKPOINT_TRIGGER_READ, wp_addr2, len2);
+
+	/* PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DAWR Overlap, WO test */
+	wh1 = ptrace_sethwdebug(child_pid, &info1);
+
+	/* PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DAWR Overlap, RO test */
+	wh2 = ptrace_sethwdebug(child_pid, &info2);
+
+	ptrace(PTRACE_CONT, child_pid, NULL, 0);
+	check_success(child_pid, name, "WO", wp_addr1, len1);
+
+	ptrace(PTRACE_CONT, child_pid, NULL, 0);
+	check_success(child_pid, name, "RO", wp_addr2, len2);
+
+	ptrace_delhwdebug(child_pid, wh1);
+	ptrace_delhwdebug(child_pid, wh2);
+}
+
 static void test_sethwdebug_range_unaligned(pid_t child_pid)
 {
 	struct ppc_hw_breakpoint info;
@@ -460,6 +535,10 @@ run_tests(pid_t child_pid, struct ppc_debug_info *dbginfo, bool dawr)
 			test_sethwdebug_range_unaligned(child_pid);
 			test_sethwdebug_range_unaligned_dar(child_pid);
 			test_sethwdebug_dawr_max_range(child_pid);
+			if (dbginfo->num_data_bps > 1) {
+				test_multi_sethwdebug_range(child_pid);
+				test_multi_sethwdebug_range_dawr_overlap(child_pid);
+			}
 		}
 	}
 }
-- 
2.26.2

[PATCH 5/7] powerpc/selftests/perf-hwbreak: Coalesce event creation code

[Ravi Bangoria]

perf-hwbreak selftest opens hw-breakpoint event at multiple places for
which it has same code repeated. Coalesce that code into a function.

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
---
 .../selftests/powerpc/ptrace/perf-hwbreak.c   | 78 +++++++++----------
 1 file changed, 38 insertions(+), 40 deletions(-)

diff --git a/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c b/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c
index c1f324afdbf3..bde475341c8a 100644
--- a/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c
+++ b/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c
@@ -34,28 +34,46 @@
 
 #define DAWR_LENGTH_MAX ((0x3f + 1) * 8)
 
-static inline int sys_perf_event_open(struct perf_event_attr *attr, pid_t pid,
-				      int cpu, int group_fd,
-				      unsigned long flags)
+static void perf_event_attr_set(struct perf_event_attr *attr,
+				__u32 type, __u64 addr, __u64 len,
+				bool exclude_user)
 {
-	attr->size = sizeof(*attr);
-	return syscall(__NR_perf_event_open, attr, pid, cpu, group_fd, flags);
+	memset(attr, 0, sizeof(struct perf_event_attr));
+	attr->type           = PERF_TYPE_BREAKPOINT;
+	attr->size           = sizeof(struct perf_event_attr);
+	attr->bp_type        = type;
+	attr->bp_addr        = addr;
+	attr->bp_len         = len;
+	attr->exclude_kernel = 1;
+	attr->exclude_hv     = 1;
+	attr->exclude_guest  = 1;
+	attr->exclude_user   = exclude_user;
+	attr->disabled       = 1;
 }
 
-static inline bool breakpoint_test(int len)
+static int
+perf_process_event_open_exclude_user(__u32 type, __u64 addr, __u64 len, bool exclude_user)
 {
 	struct perf_event_attr attr;
+
+	perf_event_attr_set(&attr, type, addr, len, exclude_user);
+	return syscall(__NR_perf_event_open, &attr, getpid(), -1, -1, 0);
+}
+
+static int perf_process_event_open(__u32 type, __u64 addr, __u64 len)
+{
+	struct perf_event_attr attr;
+
+	perf_event_attr_set(&attr, type, addr, len, 0);
+	return syscall(__NR_perf_event_open, &attr, getpid(), -1, -1, 0);
+}
+
+static inline bool breakpoint_test(int len)
+{
 	int fd;
 
-	/* setup counters */
-	memset(&attr, 0, sizeof(attr));
-	attr.disabled = 1;
-	attr.type = PERF_TYPE_BREAKPOINT;
-	attr.bp_type = HW_BREAKPOINT_R;
 	/* bp_addr can point anywhere but needs to be aligned */
-	attr.bp_addr = (__u64)(&attr) & 0xfffffffffffff800;
-	attr.bp_len = len;
-	fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
+	fd = perf_process_event_open(HW_BREAKPOINT_R, (__u64)(&fd) & 0xfffffffffffff800, len);
 	if (fd < 0)
 		return false;
 	close(fd);
@@ -75,7 +93,6 @@ static inline bool dawr_supported(void)
 static int runtestsingle(int readwriteflag, int exclude_user, int arraytest)
 {
 	int i,j;
-	struct perf_event_attr attr;
 	size_t res;
 	unsigned long long breaks, needed;
 	int readint;
@@ -94,19 +111,11 @@ static int runtestsingle(int readwriteflag, int exclude_user, int arraytest)
 	if (arraytest)
 		ptr = &readintalign[0];
 
-	/* setup counters */
-	memset(&attr, 0, sizeof(attr));
-	attr.disabled = 1;
-	attr.type = PERF_TYPE_BREAKPOINT;
-	attr.bp_type = readwriteflag;
-	attr.bp_addr = (__u64)ptr;
-	attr.bp_len = sizeof(int);
-	if (arraytest)
-		attr.bp_len = DAWR_LENGTH_MAX;
-	attr.exclude_user = exclude_user;
-	break_fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
+	break_fd = perf_process_event_open_exclude_user(readwriteflag, (__u64)ptr,
+				arraytest ? DAWR_LENGTH_MAX : sizeof(int),
+				exclude_user);
 	if (break_fd < 0) {
-		perror("sys_perf_event_open");
+		perror("perf_process_event_open_exclude_user");
 		exit(1);
 	}
 
@@ -153,7 +162,6 @@ static int runtest_dar_outside(void)
 	void *target;
 	volatile __u16 temp16;
 	volatile __u64 temp64;
-	struct perf_event_attr attr;
 	int break_fd;
 	unsigned long long breaks;
 	int fail = 0;
@@ -165,21 +173,11 @@ static int runtest_dar_outside(void)
 		exit(EXIT_FAILURE);
 	}
 
-	/* setup counters */
-	memset(&attr, 0, sizeof(attr));
-	attr.disabled = 1;
-	attr.type = PERF_TYPE_BREAKPOINT;
-	attr.exclude_kernel = 1;
-	attr.exclude_hv = 1;
-	attr.exclude_guest = 1;
-	attr.bp_type = HW_BREAKPOINT_RW;
 	/* watch middle half of target array */
-	attr.bp_addr = (__u64)(target + 2);
-	attr.bp_len = 4;
-	break_fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
+	break_fd = perf_process_event_open(HW_BREAKPOINT_RW, (__u64)(target + 2), 4);
 	if (break_fd < 0) {
 		free(target);
-		perror("sys_perf_event_open");
+		perror("perf_process_event_open");
 		exit(EXIT_FAILURE);
 	}
 
-- 
2.26.2

[PATCH 6/7] powerpc/selftests/perf-hwbreak: Add testcases for 2nd DAWR

[Ravi Bangoria]

Extend perf-hwbreak.c selftest to test multiple DAWRs. Also add
testcase for testing 512 byte boundary removal.

Sample o/p:
  # ./perf-hwbreak
  ...
  TESTED: Process specific, Two events, diff addr
  TESTED: Process specific, Two events, same addr
  TESTED: Process specific, Two events, diff addr, one is RO, other is WO
  TESTED: Process specific, Two events, same addr, one is RO, other is WO
  TESTED: Systemwide, Two events, diff addr
  TESTED: Systemwide, Two events, same addr
  TESTED: Systemwide, Two events, diff addr, one is RO, other is WO
  TESTED: Systemwide, Two events, same addr, one is RO, other is WO
  TESTED: Process specific, 512 bytes, unaligned
  success: perf_hwbreak

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
---
 .../selftests/powerpc/ptrace/perf-hwbreak.c   | 568 +++++++++++++++++-
 1 file changed, 567 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c b/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c
index bde475341c8a..5df08738884d 100644
--- a/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c
+++ b/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c
@@ -21,8 +21,13 @@
 #include <assert.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <signal.h>
 #include <string.h>
 #include <sys/ioctl.h>
+#include <sys/wait.h>
+#include <sys/ptrace.h>
+#include <sys/sysinfo.h>
+#include <asm/ptrace.h>
 #include <elf.h>
 #include <pthread.h>
 #include <sys/syscall.h>
@@ -34,6 +39,12 @@
 
 #define DAWR_LENGTH_MAX ((0x3f + 1) * 8)
 
+int nprocs;
+
+static volatile int a = 10;
+static volatile int b = 10;
+static volatile char c[512 + 8] __attribute__((aligned(512)));
+
 static void perf_event_attr_set(struct perf_event_attr *attr,
 				__u32 type, __u64 addr, __u64 len,
 				bool exclude_user)
@@ -68,6 +79,76 @@ static int perf_process_event_open(__u32 type, __u64 addr, __u64 len)
 	return syscall(__NR_perf_event_open, &attr, getpid(), -1, -1, 0);
 }
 
+static int perf_cpu_event_open(long cpu, __u32 type, __u64 addr, __u64 len)
+{
+	struct perf_event_attr attr;
+
+	perf_event_attr_set(&attr, type, addr, len, 0);
+	return syscall(__NR_perf_event_open, &attr, -1, cpu, -1, 0);
+}
+
+static void close_fds(int *fd, int n)
+{
+	int i;
+
+	for (i = 0; i < n; i++)
+		close(fd[i]);
+}
+
+static unsigned long read_fds(int *fd, int n)
+{
+	int i;
+	unsigned long c = 0;
+	unsigned long count = 0;
+	size_t res;
+
+	for (i = 0; i < n; i++) {
+		res = read(fd[i], &c, sizeof(c));
+		assert(res == sizeof(unsigned long long));
+		count += c;
+	}
+	return count;
+}
+
+static void reset_fds(int *fd, int n)
+{
+	int i;
+
+	for (i = 0; i < n; i++)
+		ioctl(fd[i], PERF_EVENT_IOC_RESET);
+}
+
+static void enable_fds(int *fd, int n)
+{
+	int i;
+
+	for (i = 0; i < n; i++)
+		ioctl(fd[i], PERF_EVENT_IOC_ENABLE);
+}
+
+static void disable_fds(int *fd, int n)
+{
+	int i;
+
+	for (i = 0; i < n; i++)
+		ioctl(fd[i], PERF_EVENT_IOC_DISABLE);
+}
+
+static int perf_systemwide_event_open(int *fd, __u32 type, __u64 addr, __u64 len)
+{
+	int i = 0;
+
+	/* Assume online processors are 0 to nprocs for simplisity */
+	for (i = 0; i < nprocs; i++) {
+		fd[i] = perf_cpu_event_open(i, type, addr, len);
+		if (fd[i] < 0) {
+			close_fds(fd, i);
+			return fd[i];
+		}
+	}
+	return 0;
+}
+
 static inline bool breakpoint_test(int len)
 {
 	int fd;
@@ -261,11 +342,483 @@ static int runtest_dar_outside(void)
 	return fail;
 }
 
+static void multi_dawr_workload(void)
+{
+	a += 10;
+	b += 10;
+	c[512 + 1] += 'a';
+}
+
+static int test_process_multi_diff_addr(void)
+{
+	unsigned long long breaks1 = 0, breaks2 = 0;
+	int fd1, fd2;
+	char *desc = "Process specific, Two events, diff addr";
+	size_t res;
+
+	fd1 = perf_process_event_open(HW_BREAKPOINT_RW, (__u64)&a, (__u64)sizeof(a));
+	if (fd1 < 0) {
+		perror("perf_process_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	fd2 = perf_process_event_open(HW_BREAKPOINT_RW, (__u64)&b, (__u64)sizeof(b));
+	if (fd2 < 0) {
+		close(fd1);
+		perror("perf_process_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	ioctl(fd1, PERF_EVENT_IOC_RESET);
+	ioctl(fd2, PERF_EVENT_IOC_RESET);
+	ioctl(fd1, PERF_EVENT_IOC_ENABLE);
+	ioctl(fd2, PERF_EVENT_IOC_ENABLE);
+	multi_dawr_workload();
+	ioctl(fd1, PERF_EVENT_IOC_DISABLE);
+	ioctl(fd2, PERF_EVENT_IOC_DISABLE);
+
+	res = read(fd1, &breaks1, sizeof(breaks1));
+	assert(res == sizeof(unsigned long long));
+	res = read(fd2, &breaks2, sizeof(breaks2));
+	assert(res == sizeof(unsigned long long));
+
+	close(fd1);
+	close(fd2);
+
+	if (breaks1 != 2 || breaks2 != 2) {
+		printf("FAILED: %s: %lld != 2 || %lld != 2\n", desc,
+			breaks1, breaks2);
+		return 1;
+	}
+
+	printf("TESTED: %s\n", desc);
+	return 0;
+}
+
+static int test_process_multi_same_addr(void)
+{
+	unsigned long long breaks1 = 0, breaks2 = 0;
+	int fd1, fd2;
+	char *desc = "Process specific, Two events, same addr";
+	size_t res;
+
+	fd1 = perf_process_event_open(HW_BREAKPOINT_RW, (__u64)&a, (__u64)sizeof(a));
+	if (fd1 < 0) {
+		perror("perf_process_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	fd2 = perf_process_event_open(HW_BREAKPOINT_RW, (__u64)&a, (__u64)sizeof(a));
+	if (fd2 < 0) {
+		close(fd1);
+		perror("perf_process_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	ioctl(fd1, PERF_EVENT_IOC_RESET);
+	ioctl(fd2, PERF_EVENT_IOC_RESET);
+	ioctl(fd1, PERF_EVENT_IOC_ENABLE);
+	ioctl(fd2, PERF_EVENT_IOC_ENABLE);
+	multi_dawr_workload();
+	ioctl(fd1, PERF_EVENT_IOC_DISABLE);
+	ioctl(fd2, PERF_EVENT_IOC_DISABLE);
+
+	res = read(fd1, &breaks1, sizeof(breaks1));
+	assert(res == sizeof(unsigned long long));
+	res = read(fd2, &breaks2, sizeof(breaks2));
+	assert(res == sizeof(unsigned long long));
+
+	close(fd1);
+	close(fd2);
+
+	if (breaks1 != 2 || breaks2 != 2) {
+		printf("FAILED: %s: %lld != 2 || %lld != 2\n", desc,
+			breaks1, breaks2);
+		return 1;
+	}
+
+	printf("TESTED: %s\n", desc);
+	return 0;
+}
+
+static int test_process_multi_diff_addr_ro_wo(void)
+{
+	unsigned long long breaks1 = 0, breaks2 = 0;
+	int fd1, fd2;
+	char *desc = "Process specific, Two events, diff addr, one is RO, other is WO";
+	size_t res;
+
+	fd1 = perf_process_event_open(HW_BREAKPOINT_W, (__u64)&a, (__u64)sizeof(a));
+	if (fd1 < 0) {
+		perror("perf_process_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	fd2 = perf_process_event_open(HW_BREAKPOINT_R, (__u64)&b, (__u64)sizeof(b));
+	if (fd2 < 0) {
+		close(fd1);
+		perror("perf_process_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	ioctl(fd1, PERF_EVENT_IOC_RESET);
+	ioctl(fd2, PERF_EVENT_IOC_RESET);
+	ioctl(fd1, PERF_EVENT_IOC_ENABLE);
+	ioctl(fd2, PERF_EVENT_IOC_ENABLE);
+	multi_dawr_workload();
+	ioctl(fd1, PERF_EVENT_IOC_DISABLE);
+	ioctl(fd2, PERF_EVENT_IOC_DISABLE);
+
+	res = read(fd1, &breaks1, sizeof(breaks1));
+	assert(res == sizeof(unsigned long long));
+	res = read(fd2, &breaks2, sizeof(breaks2));
+	assert(res == sizeof(unsigned long long));
+
+	close(fd1);
+	close(fd2);
+
+	if (breaks1 != 1 || breaks2 != 1) {
+		printf("FAILED: %s: %lld != 1 || %lld != 1\n", desc,
+			breaks1, breaks2);
+		return 1;
+	}
+
+	printf("TESTED: %s\n", desc);
+	return 0;
+}
+
+static int test_process_multi_same_addr_ro_wo(void)
+{
+	unsigned long long breaks1 = 0, breaks2 = 0;
+	int fd1, fd2;
+	char *desc = "Process specific, Two events, same addr, one is RO, other is WO";
+	size_t res;
+
+	fd1 = perf_process_event_open(HW_BREAKPOINT_R, (__u64)&a, (__u64)sizeof(a));
+	if (fd1 < 0) {
+		perror("perf_process_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	fd2 = perf_process_event_open(HW_BREAKPOINT_W, (__u64)&a, (__u64)sizeof(a));
+	if (fd2 < 0) {
+		close(fd1);
+		perror("perf_process_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	ioctl(fd1, PERF_EVENT_IOC_RESET);
+	ioctl(fd2, PERF_EVENT_IOC_RESET);
+	ioctl(fd1, PERF_EVENT_IOC_ENABLE);
+	ioctl(fd2, PERF_EVENT_IOC_ENABLE);
+	multi_dawr_workload();
+	ioctl(fd1, PERF_EVENT_IOC_DISABLE);
+	ioctl(fd2, PERF_EVENT_IOC_DISABLE);
+
+	res = read(fd1, &breaks1, sizeof(breaks1));
+	assert(res == sizeof(unsigned long long));
+	res = read(fd2, &breaks2, sizeof(breaks2));
+	assert(res == sizeof(unsigned long long));
+
+	close(fd1);
+	close(fd2);
+
+	if (breaks1 != 1 || breaks2 != 1) {
+		printf("FAILED: %s: %lld != 1 || %lld != 1\n", desc,
+			breaks1, breaks2);
+		return 1;
+	}
+
+	printf("TESTED: %s\n", desc);
+	return 0;
+}
+
+static int test_syswide_multi_diff_addr(void)
+{
+	unsigned long long breaks1 = 0, breaks2 = 0;
+	int *fd1 = malloc(nprocs * sizeof(int));
+	int *fd2 = malloc(nprocs * sizeof(int));
+	char *desc = "Systemwide, Two events, diff addr";
+	int ret;
+
+	ret = perf_systemwide_event_open(fd1, HW_BREAKPOINT_RW, (__u64)&a,
+					(__u64)sizeof(a));
+	if (ret) {
+		perror("perf_systemwide_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	ret = perf_systemwide_event_open(fd2, HW_BREAKPOINT_RW, (__u64)&b,
+					(__u64)sizeof(b));
+	if (ret) {
+		close_fds(fd1, nprocs);
+		perror("perf_systemwide_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	reset_fds(fd1, nprocs);
+	reset_fds(fd2, nprocs);
+	enable_fds(fd1, nprocs);
+	enable_fds(fd2, nprocs);
+	multi_dawr_workload();
+	disable_fds(fd1, nprocs);
+	disable_fds(fd2, nprocs);
+
+	breaks1 = read_fds(fd1, nprocs);
+	breaks2 = read_fds(fd2, nprocs);
+
+	close_fds(fd1, nprocs);
+	close_fds(fd2, nprocs);
+
+	free(fd1);
+	free(fd2);
+
+	if (breaks1 != 2 || breaks2 != 2) {
+		printf("FAILED: %s: %lld != 2 || %lld != 2\n", desc,
+			breaks1, breaks2);
+		return 1;
+	}
+
+	printf("TESTED: %s\n", desc);
+	return 0;
+}
+
+static int test_syswide_multi_same_addr(void)
+{
+	unsigned long long breaks1 = 0, breaks2 = 0;
+	int *fd1 = malloc(nprocs * sizeof(int));
+	int *fd2 = malloc(nprocs * sizeof(int));
+	char *desc = "Systemwide, Two events, same addr";
+	int ret;
+
+	ret = perf_systemwide_event_open(fd1, HW_BREAKPOINT_RW, (__u64)&a,
+					(__u64)sizeof(a));
+	if (ret) {
+		perror("perf_systemwide_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	ret = perf_systemwide_event_open(fd2, HW_BREAKPOINT_RW, (__u64)&a,
+					(__u64)sizeof(a));
+	if (ret) {
+		close_fds(fd1, nprocs);
+		perror("perf_systemwide_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	reset_fds(fd1, nprocs);
+	reset_fds(fd2, nprocs);
+	enable_fds(fd1, nprocs);
+	enable_fds(fd2, nprocs);
+	multi_dawr_workload();
+	disable_fds(fd1, nprocs);
+	disable_fds(fd2, nprocs);
+
+	breaks1 = read_fds(fd1, nprocs);
+	breaks2 = read_fds(fd2, nprocs);
+
+	close_fds(fd1, nprocs);
+	close_fds(fd2, nprocs);
+
+	free(fd1);
+	free(fd2);
+
+	if (breaks1 != 2 || breaks2 != 2) {
+		printf("FAILED: %s: %lld != 2 || %lld != 2\n", desc,
+			breaks1, breaks2);
+		return 1;
+	}
+
+	printf("TESTED: %s\n", desc);
+	return 0;
+}
+
+static int test_syswide_multi_diff_addr_ro_wo(void)
+{
+	unsigned long long breaks1 = 0, breaks2 = 0;
+	int *fd1 = malloc(nprocs * sizeof(int));
+	int *fd2 = malloc(nprocs * sizeof(int));
+	char *desc = "Systemwide, Two events, diff addr, one is RO, other is WO";
+	int ret;
+
+	ret = perf_systemwide_event_open(fd1, HW_BREAKPOINT_W, (__u64)&a,
+					(__u64)sizeof(a));
+	if (ret) {
+		perror("perf_systemwide_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	ret = perf_systemwide_event_open(fd2, HW_BREAKPOINT_R, (__u64)&b,
+					(__u64)sizeof(b));
+	if (ret) {
+		close_fds(fd1, nprocs);
+		perror("perf_systemwide_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	reset_fds(fd1, nprocs);
+	reset_fds(fd2, nprocs);
+	enable_fds(fd1, nprocs);
+	enable_fds(fd2, nprocs);
+	multi_dawr_workload();
+	disable_fds(fd1, nprocs);
+	disable_fds(fd2, nprocs);
+
+	breaks1 = read_fds(fd1, nprocs);
+	breaks2 = read_fds(fd2, nprocs);
+
+	close_fds(fd1, nprocs);
+	close_fds(fd2, nprocs);
+
+	free(fd1);
+	free(fd2);
+
+	if (breaks1 != 1 || breaks2 != 1) {
+		printf("FAILED: %s: %lld != 1 || %lld != 1\n", desc,
+			breaks1, breaks2);
+		return 1;
+	}
+
+	printf("TESTED: %s\n", desc);
+	return 0;
+}
+
+static int test_syswide_multi_same_addr_ro_wo(void)
+{
+	unsigned long long breaks1 = 0, breaks2 = 0;
+	int *fd1 = malloc(nprocs * sizeof(int));
+	int *fd2 = malloc(nprocs * sizeof(int));
+	char *desc = "Systemwide, Two events, same addr, one is RO, other is WO";
+	int ret;
+
+	ret = perf_systemwide_event_open(fd1, HW_BREAKPOINT_W, (__u64)&a,
+					(__u64)sizeof(a));
+	if (ret) {
+		perror("perf_systemwide_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	ret = perf_systemwide_event_open(fd2, HW_BREAKPOINT_R, (__u64)&a,
+					(__u64)sizeof(a));
+	if (ret) {
+		close_fds(fd1, nprocs);
+		perror("perf_systemwide_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	reset_fds(fd1, nprocs);
+	reset_fds(fd2, nprocs);
+	enable_fds(fd1, nprocs);
+	enable_fds(fd2, nprocs);
+	multi_dawr_workload();
+	disable_fds(fd1, nprocs);
+	disable_fds(fd2, nprocs);
+
+	breaks1 = read_fds(fd1, nprocs);
+	breaks2 = read_fds(fd2, nprocs);
+
+	close_fds(fd1, nprocs);
+	close_fds(fd2, nprocs);
+
+	free(fd1);
+	free(fd2);
+
+	if (breaks1 != 1 || breaks2 != 1) {
+		printf("FAILED: %s: %lld != 1 || %lld != 1\n", desc,
+			breaks1, breaks2);
+		return 1;
+	}
+
+	printf("TESTED: %s\n", desc);
+	return 0;
+}
+
+static int runtest_multi_dawr(void)
+{
+	int ret = 0;
+
+	ret |= test_process_multi_diff_addr();
+	ret |= test_process_multi_same_addr();
+	ret |= test_process_multi_diff_addr_ro_wo();
+	ret |= test_process_multi_same_addr_ro_wo();
+	ret |= test_syswide_multi_diff_addr();
+	ret |= test_syswide_multi_same_addr();
+	ret |= test_syswide_multi_diff_addr_ro_wo();
+	ret |= test_syswide_multi_same_addr_ro_wo();
+
+	return ret;
+}
+
+static int runtest_unaligned_512bytes(void)
+{
+	unsigned long long breaks = 0;
+	int fd;
+	char *desc = "Process specific, 512 bytes, unaligned";
+	__u64 addr = (__u64)&c + 8;
+	size_t res;
+
+	fd = perf_process_event_open(HW_BREAKPOINT_RW, addr, 512);
+	if (fd < 0) {
+		perror("perf_process_event_open");
+		exit(EXIT_FAILURE);
+	}
+
+	ioctl(fd, PERF_EVENT_IOC_RESET);
+	ioctl(fd, PERF_EVENT_IOC_ENABLE);
+	multi_dawr_workload();
+	ioctl(fd, PERF_EVENT_IOC_DISABLE);
+
+	res = read(fd, &breaks, sizeof(breaks));
+	assert(res == sizeof(unsigned long long));
+
+	close(fd);
+
+	if (breaks != 2) {
+		printf("FAILED: %s: %lld != 2\n", desc, breaks);
+		return 1;
+	}
+
+	printf("TESTED: %s\n", desc);
+	return 0;
+}
+
+/* There is no perf api to find number of available watchpoints. Use ptrace. */
+static int get_nr_wps(bool *arch_31)
+{
+	struct ppc_debug_info dbginfo;
+	int child_pid;
+
+	child_pid = fork();
+	if (!child_pid) {
+		int ret = ptrace(PTRACE_TRACEME, 0, NULL, 0);
+		if (ret) {
+			perror("PTRACE_TRACEME failed\n");
+			exit(EXIT_FAILURE);
+		}
+		kill(getpid(), SIGUSR1);
+
+		sleep(1);
+		exit(EXIT_SUCCESS);
+	}
+
+	wait(NULL);
+	if (ptrace(PPC_PTRACE_GETHWDBGINFO, child_pid, NULL, &dbginfo)) {
+		perror("Can't get breakpoint info");
+		exit(EXIT_FAILURE);
+	}
+
+	*arch_31 = !!(dbginfo.features & PPC_DEBUG_FEATURE_DATA_BP_DAWR_ARCH_31);
+	return dbginfo.num_data_bps;
+}
+
 static int runtest(void)
 {
 	int rwflag;
 	int exclude_user;
 	int ret;
+	bool dawr = dawr_supported();
+	bool arch_31 = false;
+	int nr_wps = get_nr_wps(&arch_31);
 
 	/*
 	 * perf defines rwflag as two bits read and write and at least
@@ -278,7 +831,7 @@ static int runtest(void)
 				return ret;
 
 			/* if we have the dawr, we can do an array test */
-			if (!dawr_supported())
+			if (!dawr)
 				continue;
 			ret = runtestsingle(rwflag, exclude_user, 1);
 			if (ret)
@@ -287,6 +840,19 @@ static int runtest(void)
 	}
 
 	ret = runtest_dar_outside();
+	if (ret)
+		return ret;
+
+	if (dawr && nr_wps > 1) {
+		nprocs = get_nprocs();
+		ret = runtest_multi_dawr();
+		if (ret)
+			return ret;
+	}
+
+	if (dawr && arch_31)
+		ret = runtest_unaligned_512bytes();
+
 	return ret;
 }
 
-- 
2.26.2

[PATCH 7/7] powerpc/selftests: Add selftest to test concurrent perf/ptrace events

[Ravi Bangoria]

ptrace and perf watchpoints can't co-exists if their address range
overlaps. See commit 29da4f91c0c1 ("powerpc/watchpoint: Don't allow
concurrent perf and ptrace events") for more detail. Add selftest
for the same.

Sample o/p:
  # ./ptrace-perf-hwbreak
  test: ptrace-perf-hwbreak
  tags: git_version:powerpc-5.8-7-118-g937fa174a15d-dirty
  perf cpu event -> ptrace thread event (Overlapping): Ok
  perf cpu event -> ptrace thread event (Non-overlapping): Ok
  perf thread event -> ptrace same thread event (Overlapping): Ok
  perf thread event -> ptrace same thread event (Non-overlapping): Ok
  perf thread event -> ptrace other thread event: Ok
  ptrace thread event -> perf kernel event: Ok
  ptrace thread event -> perf same thread event (Overlapping): Ok
  ptrace thread event -> perf same thread event (Non-overlapping): Ok
  ptrace thread event -> perf other thread event: Ok
  ptrace thread event -> perf cpu event (Overlapping): Ok
  ptrace thread event -> perf cpu event (Non-overlapping): Ok
  ptrace thread event -> perf same thread & cpu event (Overlapping): Ok
  ptrace thread event -> perf same thread & cpu event (Non-overlapping): Ok
  ptrace thread event -> perf other thread & cpu event: Ok
  success: ptrace-perf-hwbreak

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
---
 .../selftests/powerpc/ptrace/.gitignore       |   1 +
 .../testing/selftests/powerpc/ptrace/Makefile |   2 +-
 .../powerpc/ptrace/ptrace-perf-hwbreak.c      | 659 ++++++++++++++++++
 3 files changed, 661 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/powerpc/ptrace/ptrace-perf-hwbreak.c

diff --git a/tools/testing/selftests/powerpc/ptrace/.gitignore b/tools/testing/selftests/powerpc/ptrace/.gitignore
index 0e96150b7c7e..eb75e5360e31 100644
--- a/tools/testing/selftests/powerpc/ptrace/.gitignore
+++ b/tools/testing/selftests/powerpc/ptrace/.gitignore
@@ -14,3 +14,4 @@ perf-hwbreak
 core-pkey
 ptrace-pkey
 ptrace-syscall
+ptrace-perf-hwbreak
diff --git a/tools/testing/selftests/powerpc/ptrace/Makefile b/tools/testing/selftests/powerpc/ptrace/Makefile
index 8d3f006c98cc..a500639da97a 100644
--- a/tools/testing/selftests/powerpc/ptrace/Makefile
+++ b/tools/testing/selftests/powerpc/ptrace/Makefile
@@ -2,7 +2,7 @@
 TEST_GEN_PROGS := ptrace-gpr ptrace-tm-gpr ptrace-tm-spd-gpr \
               ptrace-tar ptrace-tm-tar ptrace-tm-spd-tar ptrace-vsx ptrace-tm-vsx \
               ptrace-tm-spd-vsx ptrace-tm-spr ptrace-hwbreak ptrace-pkey core-pkey \
-              perf-hwbreak ptrace-syscall
+              perf-hwbreak ptrace-syscall ptrace-perf-hwbreak
 
 top_srcdir = ../../../../..
 include ../../lib.mk
diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-perf-hwbreak.c b/tools/testing/selftests/powerpc/ptrace/ptrace-perf-hwbreak.c
new file mode 100644
index 000000000000..6b8804a4942e
--- /dev/null
+++ b/tools/testing/selftests/powerpc/ptrace/ptrace-perf-hwbreak.c
@@ -0,0 +1,659 @@
+// SPDX-License-Identifier: GPL-2.0+
+#include <stdio.h>
+#include <string.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <linux/hw_breakpoint.h>
+#include <linux/perf_event.h>
+#include <asm/unistd.h>
+#include <sys/ptrace.h>
+#include <sys/wait.h>
+#include "ptrace.h"
+
+char data[16];
+
+/* Overlapping address range */
+volatile __u64 *ptrace_data1 = (__u64 *)&data[0];
+volatile __u64 *perf_data1 = (__u64 *)&data[4];
+
+/* Non-overlapping address range */
+volatile __u64 *ptrace_data2 = (__u64 *)&data[0];
+volatile __u64 *perf_data2 = (__u64 *)&data[8];
+
+static unsigned long pid_max_addr(void)
+{
+	FILE *fp;
+	char *line, *c;
+	char addr[100];
+	size_t len = 0;
+
+	fp = fopen("/proc/kallsyms", "r");
+	if (!fp) {
+		printf("Failed to read /proc/kallsyms. Exiting..\n");
+		exit(EXIT_FAILURE);
+	}
+
+	while (getline(&line, &len, fp) != -1) {
+		if (!strstr(line, "pid_max") || strstr(line, "pid_max_max") ||
+		    strstr(line, "pid_max_min"))
+			continue;
+
+		strncpy(addr, line, len < 100 ? len : 100);
+		c = strchr(addr, ' ');
+		*c = '\0';
+		return strtoul(addr, &c, 16);
+	}
+	fclose(fp);
+	printf("Could not find pix_max. Exiting..\n");
+	exit(EXIT_FAILURE);
+	return -1;
+}
+
+static void perf_user_event_attr_set(struct perf_event_attr *attr, __u64 addr, __u64 len)
+{
+	memset(attr, 0, sizeof(struct perf_event_attr));
+	attr->type           = PERF_TYPE_BREAKPOINT;
+	attr->size           = sizeof(struct perf_event_attr);
+	attr->bp_type        = HW_BREAKPOINT_R;
+	attr->bp_addr        = addr;
+	attr->bp_len         = len;
+	attr->exclude_kernel = 1;
+	attr->exclude_hv     = 1;
+}
+
+static void perf_kernel_event_attr_set(struct perf_event_attr *attr)
+{
+	memset(attr, 0, sizeof(struct perf_event_attr));
+	attr->type           = PERF_TYPE_BREAKPOINT;
+	attr->size           = sizeof(struct perf_event_attr);
+	attr->bp_type        = HW_BREAKPOINT_R;
+	attr->bp_addr        = pid_max_addr();
+	attr->bp_len         = sizeof(unsigned long);
+	attr->exclude_user   = 1;
+	attr->exclude_hv     = 1;
+}
+
+static int perf_cpu_event_open(int cpu, __u64 addr, __u64 len)
+{
+	struct perf_event_attr attr;
+
+	perf_user_event_attr_set(&attr, addr, len);
+	return syscall(__NR_perf_event_open, &attr, -1, cpu, -1, 0);
+}
+
+static int perf_thread_event_open(pid_t child_pid, __u64 addr, __u64 len)
+{
+	struct perf_event_attr attr;
+
+	perf_user_event_attr_set(&attr, addr, len);
+	return syscall(__NR_perf_event_open, &attr, child_pid, -1, -1, 0);
+}
+
+static int perf_thread_cpu_event_open(pid_t child_pid, int cpu, __u64 addr, __u64 len)
+{
+	struct perf_event_attr attr;
+
+	perf_user_event_attr_set(&attr, addr, len);
+	return syscall(__NR_perf_event_open, &attr, child_pid, cpu, -1, 0);
+}
+
+static int perf_thread_kernel_event_open(pid_t child_pid)
+{
+	struct perf_event_attr attr;
+
+	perf_kernel_event_attr_set(&attr);
+	return syscall(__NR_perf_event_open, &attr, child_pid, -1, -1, 0);
+}
+
+static int perf_cpu_kernel_event_open(int cpu)
+{
+	struct perf_event_attr attr;
+
+	perf_kernel_event_attr_set(&attr);
+	return syscall(__NR_perf_event_open, &attr, -1, cpu, -1, 0);
+}
+
+static int child(void)
+{
+	int ret;
+
+	ret = ptrace(PTRACE_TRACEME, 0, NULL, 0);
+	if (ret) {
+		printf("Error: PTRACE_TRACEME failed\n");
+		return 0;
+	}
+	kill(getpid(), SIGUSR1); /* --> parent (SIGUSR1) */
+
+	return 0;
+}
+
+static void ptrace_ppc_hw_breakpoint(struct ppc_hw_breakpoint *info, int type,
+				     __u64 addr, int len)
+{
+	info->version = 1;
+	info->trigger_type = type;
+	info->condition_mode = PPC_BREAKPOINT_CONDITION_NONE;
+	info->addr = addr;
+	info->addr2 = addr + len;
+	info->condition_value = 0;
+	if (!len)
+		info->addr_mode = PPC_BREAKPOINT_MODE_EXACT;
+	else
+		info->addr_mode = PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE;
+}
+
+static int ptrace_open(pid_t child_pid, __u64 wp_addr, int len)
+{
+	struct ppc_hw_breakpoint info;
+
+	ptrace_ppc_hw_breakpoint(&info, PPC_BREAKPOINT_TRIGGER_RW, wp_addr, len);
+	return ptrace(PPC_PTRACE_SETHWDEBUG, child_pid, 0, &info);
+}
+
+static int test1(pid_t child_pid)
+{
+	int perf_fd;
+	int ptrace_fd;
+	int ret = 0;
+
+	/* Test:
+	 * if (new per thread event by ptrace)
+	 *	if (existing cpu event by perf)
+	 *		if (addr range overlaps)
+	 *			fail;
+	 */
+
+	perf_fd = perf_cpu_event_open(0, (__u64)perf_data1, sizeof(*perf_data1));
+	if (perf_fd < 0)
+		return -1;
+
+	ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1));
+	if (ptrace_fd > 0 || errno != ENOSPC)
+		ret = -1;
+
+	close(perf_fd);
+	return ret;
+}
+
+static int test2(pid_t child_pid)
+{
+	int perf_fd;
+	int ptrace_fd;
+	int ret = 0;
+
+	/* Test:
+	 * if (new per thread event by ptrace)
+	 *	if (existing cpu event by perf)
+	 *		if (addr range does not overlaps)
+	 *			allow;
+	 */
+
+	perf_fd = perf_cpu_event_open(0, (__u64)perf_data2, sizeof(*perf_data2));
+	if (perf_fd < 0)
+		return -1;
+
+	ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data2, sizeof(*ptrace_data2));
+	if (ptrace_fd < 0) {
+		ret = -1;
+		goto perf_close;
+	}
+	ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd);
+
+perf_close:
+	close(perf_fd);
+	return ret;
+}
+
+static int test3(pid_t child_pid)
+{
+	int perf_fd;
+	int ptrace_fd;
+	int ret = 0;
+
+	/* Test:
+	 * if (new per thread event by ptrace)
+	 *	if (existing thread event by perf on the same thread)
+	 *		if (addr range overlaps)
+	 *			fail;
+	 */
+	perf_fd = perf_thread_event_open(child_pid, (__u64)perf_data1,
+					 sizeof(*perf_data1));
+	if (perf_fd < 0)
+		return -1;
+
+	ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1));
+	if (ptrace_fd > 0 || errno != ENOSPC)
+		ret = -1;
+
+	close(perf_fd);
+	return ret;
+}
+
+static int test4(pid_t child_pid)
+{
+	int perf_fd;
+	int ptrace_fd;
+	int ret = 0;
+
+	/* Test:
+	 * if (new per thread event by ptrace)
+	 *	if (existing thread event by perf on the same thread)
+	 *		if (addr range does not overlaps)
+	 *			fail;
+	 */
+	perf_fd = perf_thread_event_open(child_pid, (__u64)perf_data2,
+					 sizeof(*perf_data2));
+	if (perf_fd < 0)
+		return -1;
+
+	ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data2, sizeof(*ptrace_data2));
+	if (ptrace_fd < 0) {
+		ret = -1;
+		goto perf_close;
+	}
+	ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd);
+
+perf_close:
+	close(perf_fd);
+	return ret;
+}
+
+static int test5(pid_t child_pid)
+{
+	int perf_fd;
+	int ptrace_fd;
+	int cpid;
+	int ret = 0;
+
+	/* Test:
+	 * if (new per thread event by ptrace)
+	 *	if (existing thread event by perf on the different thread)
+	 *		allow;
+	 */
+	cpid = fork();
+	if (!cpid) {
+		/* Temporary Child */
+		pause();
+		exit(EXIT_SUCCESS);
+	}
+
+	perf_fd = perf_thread_event_open(cpid, (__u64)perf_data1, sizeof(*perf_data1));
+	if (perf_fd < 0) {
+		ret = -1;
+		goto kill_child;
+	}
+
+	ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1));
+	if (ptrace_fd < 0) {
+		ret = -1;
+		goto perf_close;
+	}
+
+	ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd);
+perf_close:
+	close(perf_fd);
+kill_child:
+	kill(cpid, SIGINT);
+	return ret;
+}
+
+static int test6(pid_t child_pid)
+{
+	int perf_fd;
+	int ptrace_fd;
+	int ret = 0;
+
+	/* Test:
+	 * if (new per thread kernel event by perf)
+	 *	if (existing thread event by ptrace on the same thread)
+	 *		allow;
+	 * -- OR --
+	 * if (new per cpu kernel event by perf)
+	 *	if (existing thread event by ptrace)
+	 *		allow;
+	 */
+	ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1));
+	if (ptrace_fd < 0)
+		return -1;
+
+	perf_fd = perf_thread_kernel_event_open(child_pid);
+	if (perf_fd < 0) {
+		ret = -1;
+		goto ptrace_close;
+	}
+	close(perf_fd);
+
+	perf_fd = perf_cpu_kernel_event_open(0);
+	if (perf_fd < 0) {
+		ret = -1;
+		goto ptrace_close;
+	}
+	close(perf_fd);
+
+ptrace_close:
+	ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd);
+	return ret;
+}
+
+static int test7(pid_t child_pid)
+{
+	int perf_fd;
+	int ptrace_fd;
+	int ret = 0;
+
+	/* Test:
+	 * if (new per thread event by perf)
+	 *	if (existing thread event by ptrace on the same thread)
+	 *		if (addr range overlaps)
+	 *			fail;
+	 */
+	ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1));
+	if (ptrace_fd < 0)
+		return -1;
+
+	perf_fd = perf_thread_event_open(child_pid, (__u64)perf_data1,
+					 sizeof(*perf_data1));
+	if (perf_fd > 0 || errno != ENOSPC)
+		ret = -1;
+
+	ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd);
+	return ret;
+}
+
+static int test8(pid_t child_pid)
+{
+	int perf_fd;
+	int ptrace_fd;
+	int ret = 0;
+
+	/* Test:
+	 * if (new per thread event by perf)
+	 *	if (existing thread event by ptrace on the same thread)
+	 *		if (addr range does not overlaps)
+	 *			allow;
+	 */
+	ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data2, sizeof(*ptrace_data2));
+	if (ptrace_fd < 0)
+		return -1;
+
+	perf_fd = perf_thread_event_open(child_pid, (__u64)perf_data2,
+					 sizeof(*perf_data2));
+	if (perf_fd < 0) {
+		ret = -1;
+		goto ptrace_close;
+	}
+	close(perf_fd);
+
+ptrace_close:
+	ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd);
+	return ret;
+}
+
+static int test9(pid_t child_pid)
+{
+	int perf_fd;
+	int ptrace_fd;
+	int cpid;
+	int ret = 0;
+
+	/* Test:
+	 * if (new per thread event by perf)
+	 *	if (existing thread event by ptrace on the other thread)
+	 *		allow;
+	 */
+	ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1));
+	if (ptrace_fd < 0)
+		return -1;
+
+	cpid = fork();
+	if (!cpid) {
+		/* Temporary Child */
+		pause();
+		exit(EXIT_SUCCESS);
+	}
+
+	perf_fd = perf_thread_event_open(cpid, (__u64)perf_data1, sizeof(*perf_data1));
+	if (perf_fd < 0) {
+		ret = -1;
+		goto kill_child;
+	}
+	close(perf_fd);
+
+kill_child:
+	kill(cpid, SIGINT);
+	ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd);
+	return ret;
+}
+
+static int test10(pid_t child_pid)
+{
+	int perf_fd;
+	int ptrace_fd;
+	int ret = 0;
+
+	/* Test:
+	 * if (new per cpu event by perf)
+	 *	if (existing thread event by ptrace on the same thread)
+	 *		if (addr range overlaps)
+	 *			fail;
+	 */
+	ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1));
+	if (ptrace_fd < 0)
+		return -1;
+
+	perf_fd = perf_cpu_event_open(0, (__u64)perf_data1, sizeof(*perf_data1));
+	if (perf_fd > 0 || errno != ENOSPC)
+		ret = -1;
+
+	ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd);
+	return ret;
+}
+
+static int test11(pid_t child_pid)
+{
+	int perf_fd;
+	int ptrace_fd;
+	int ret = 0;
+
+	/* Test:
+	 * if (new per cpu event by perf)
+	 *	if (existing thread event by ptrace on the same thread)
+	 *		if (addr range does not overlap)
+	 *			allow;
+	 */
+	ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data2, sizeof(*ptrace_data2));
+	if (ptrace_fd < 0)
+		return -1;
+
+	perf_fd = perf_cpu_event_open(0, (__u64)perf_data2, sizeof(*perf_data2));
+	if (perf_fd < 0) {
+		ret = -1;
+		goto ptrace_close;
+	}
+	close(perf_fd);
+
+ptrace_close:
+	ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd);
+	return ret;
+}
+
+static int test12(pid_t child_pid)
+{
+	int perf_fd;
+	int ptrace_fd;
+	int ret = 0;
+
+	/* Test:
+	 * if (new per thread and per cpu event by perf)
+	 *	if (existing thread event by ptrace on the same thread)
+	 *		if (addr range overlaps)
+	 *			fail;
+	 */
+	ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1));
+	if (ptrace_fd < 0)
+		return -1;
+
+	perf_fd = perf_thread_cpu_event_open(child_pid, 0, (__u64)perf_data1,
+						sizeof(*perf_data1));
+	if (perf_fd > 0 || errno != ENOSPC)
+		ret = -1;
+
+	ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd);
+	return ret;
+}
+
+static int test13(pid_t child_pid)
+{
+	int perf_fd;
+	int ptrace_fd;
+	int ret = 0;
+
+	/* Test:
+	 * if (new per thread and per cpu event by perf)
+	 *	if (existing thread event by ptrace on the same thread)
+	 *		if (addr range does not overlap)
+	 *			allow;
+	 */
+	ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data2, sizeof(*ptrace_data2));
+	if (ptrace_fd < 0)
+		return -1;
+
+	perf_fd = perf_thread_cpu_event_open(child_pid, 0, (__u64)perf_data2,
+						sizeof(*perf_data2));
+	if (perf_fd < 0) {
+		ret = -1;
+		goto ptrace_close;
+	}
+	close(perf_fd);
+
+ptrace_close:
+	ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd);
+	return ret;
+}
+
+static int test14(pid_t child_pid)
+{
+	int perf_fd;
+	int ptrace_fd;
+	int cpid;
+	int ret = 0;
+
+	/* Test:
+	 * if (new per thread and per cpu event by perf)
+	 *	if (existing thread event by ptrace on the other thread)
+	 *		allow;
+	 */
+	ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1));
+	if (ptrace_fd < 0)
+		return -1;
+
+	cpid = fork();
+	if (!cpid) {
+		/* Temporary Child */
+		pause();
+		exit(EXIT_SUCCESS);
+	}
+
+	perf_fd = perf_thread_cpu_event_open(cpid, 0, (__u64)perf_data1,
+					     sizeof(*perf_data1));
+	if (perf_fd < 0) {
+		ret = -1;
+		goto kill_child;
+	}
+	close(perf_fd);
+
+kill_child:
+	kill(cpid, SIGINT);
+	ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd);
+	return ret;
+}
+
+#define TEST(msg, fun, arg, ret) {		\
+	int r;					\
+	r = fun(arg);				\
+	if (r)					\
+		printf("%s: Error\n", msg);	\
+	else					\
+		printf("%s: Ok\n", msg);	\
+	ret |= r;				\
+}
+
+char *desc[14] = {
+	"perf cpu event -> ptrace thread event (Overlapping)",
+	"perf cpu event -> ptrace thread event (Non-overlapping)",
+	"perf thread event -> ptrace same thread event (Overlapping)",
+	"perf thread event -> ptrace same thread event (Non-overlapping)",
+	"perf thread event -> ptrace other thread event",
+	"ptrace thread event -> perf kernel event",
+	"ptrace thread event -> perf same thread event (Overlapping)",
+	"ptrace thread event -> perf same thread event (Non-overlapping)",
+	"ptrace thread event -> perf other thread event",
+	"ptrace thread event -> perf cpu event (Overlapping)",
+	"ptrace thread event -> perf cpu event (Non-overlapping)",
+	"ptrace thread event -> perf same thread & cpu event (Overlapping)",
+	"ptrace thread event -> perf same thread & cpu event (Non-overlapping)",
+	"ptrace thread event -> perf other thread & cpu event",
+};
+
+static int test(pid_t child_pid)
+{
+	int ret = TEST_PASS;
+
+	TEST(desc[0], test1, child_pid, ret);
+	TEST(desc[1], test2, child_pid, ret);
+	TEST(desc[2], test3, child_pid, ret);
+	TEST(desc[3], test4, child_pid, ret);
+	TEST(desc[4], test5, child_pid, ret);
+	TEST(desc[5], test6, child_pid, ret);
+	TEST(desc[6], test7, child_pid, ret);
+	TEST(desc[7], test8, child_pid, ret);
+	TEST(desc[8], test9, child_pid, ret);
+	TEST(desc[9], test10, child_pid, ret);
+	TEST(desc[10], test11, child_pid, ret);
+	TEST(desc[11], test12, child_pid, ret);
+	TEST(desc[12], test13, child_pid, ret);
+	TEST(desc[13], test14, child_pid, ret);
+
+	return ret;
+}
+
+static void get_dbginfo(pid_t child_pid, struct ppc_debug_info *dbginfo)
+{
+	if (ptrace(PPC_PTRACE_GETHWDBGINFO, child_pid, NULL, dbginfo)) {
+		perror("Can't get breakpoint info");
+		exit(-1);
+	}
+}
+
+static int ptrace_perf_hwbreak(void)
+{
+	int ret;
+	pid_t child_pid;
+	struct ppc_debug_info dbginfo;
+
+	child_pid = fork();
+	if (!child_pid)
+		return child();
+
+	/* parent */
+	wait(NULL); /* <-- child (SIGUSR1) */
+
+	get_dbginfo(child_pid, &dbginfo);
+	SKIP_IF(dbginfo.num_data_bps <= 1);
+
+	ret = perf_cpu_event_open(0, (__u64)perf_data1, sizeof(*perf_data1));
+	SKIP_IF(ret < 0);
+	close(ret);
+
+	ret = test(child_pid);
+
+	ptrace(PTRACE_CONT, child_pid, NULL, 0);
+	return ret;
+}
+
+int main(int argc, char *argv[])
+{
+	return test_harness(ptrace_perf_hwbreak, "ptrace-perf-hwbreak");
+}
-- 
2.26.2

Re: [PATCH 0/7] powerpc/watchpoint: 2nd DAWR kvm enablement + selftests

[Ravi Bangoria]

On 7/23/20 3:50 PM, Ravi Bangoria wrote:
> Patch #1, #2 and #3 enables p10 2nd DAWR feature for Book3S kvm guest. DAWR
> is a hypervisor resource and thus H_SET_MODE hcall is used to set/unset it.
> A new case H_SET_MODE_RESOURCE_SET_DAWR1 is introduced in H_SET_MODE hcall
> for setting/unsetting 2nd DAWR. Also, new capability KVM_CAP_PPC_DAWR1 has
> been added to query 2nd DAWR support via kvm ioctl.
> 
> This feature also needs to be enabled in Qemu to really use it. I'll reply
> link to qemu patches once I post them in qemu-devel mailing list.

Qemu patches: https://lore.kernel.org/kvm/20200723104220.314671-1-ravi.bangoria@linux.ibm.com

Re: [PATCH 1/7] powerpc/watchpoint/kvm: Rename current DAWR macros and variables

[Paul Mackerras]

On Thu, Jul 23, 2020 at 03:50:52PM +0530, Ravi Bangoria wrote:
> Power10 is introducing second DAWR. Use real register names (with
> suffix 0) from ISA for current macros and variables used by kvm.

Most of this looks fine, but I think we should not change the existing
names in arch/powerpc/include/uapi/asm/kvm.h (and therefore also
Documentation/virt/kvm/api.rst).

> diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
> index 426f94582b7a..4dc18fe6a2bf 100644
> --- a/Documentation/virt/kvm/api.rst
> +++ b/Documentation/virt/kvm/api.rst
> @@ -2219,8 +2219,8 @@ registers, find a list below:
>    PPC     KVM_REG_PPC_BESCR               64
>    PPC     KVM_REG_PPC_TAR                 64
>    PPC     KVM_REG_PPC_DPDES               64
> -  PPC     KVM_REG_PPC_DAWR                64
> -  PPC     KVM_REG_PPC_DAWRX               64
> +  PPC     KVM_REG_PPC_DAWR0               64
> +  PPC     KVM_REG_PPC_DAWRX0              64
>    PPC     KVM_REG_PPC_CIABR               64
>    PPC     KVM_REG_PPC_IC                  64
>    PPC     KVM_REG_PPC_VTB                 64
...
> diff --git a/arch/powerpc/include/uapi/asm/kvm.h b/arch/powerpc/include/uapi/asm/kvm.h
> index 264e266a85bf..38d61b73f5ed 100644
> --- a/arch/powerpc/include/uapi/asm/kvm.h
> +++ b/arch/powerpc/include/uapi/asm/kvm.h
> @@ -608,8 +608,8 @@ struct kvm_ppc_cpu_char {
>  #define KVM_REG_PPC_BESCR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xa7)
>  #define KVM_REG_PPC_TAR		(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xa8)
>  #define KVM_REG_PPC_DPDES	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xa9)
> -#define KVM_REG_PPC_DAWR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xaa)
> -#define KVM_REG_PPC_DAWRX	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xab)
> +#define KVM_REG_PPC_DAWR0	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xaa)
> +#define KVM_REG_PPC_DAWRX0	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xab)
>  #define KVM_REG_PPC_CIABR	(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xac)
>  #define KVM_REG_PPC_IC		(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xad)
>  #define KVM_REG_PPC_VTB		(KVM_REG_PPC | KVM_REG_SIZE_U64 | 0xae)

The existing names are an API, and if you change them you will break
compilation of existing userspace programs.  I don't see that adding
the '0' on the end is so important that we need to break userspace.

Paul.

Re: [PATCH 2/7] powerpc/watchpoint/kvm: Add infrastructure to support 2nd DAWR

[Paul Mackerras]

On Thu, Jul 23, 2020 at 03:50:53PM +0530, Ravi Bangoria wrote:
> kvm code assumes single DAWR everywhere. Add code to support 2nd DAWR.
> DAWR is a hypervisor resource and thus H_SET_MODE hcall is used to set/
> unset it. Introduce new case H_SET_MODE_RESOURCE_SET_DAWR1 for 2nd DAWR.

Is this the same interface as will be defined in PAPR and available
under PowerVM, or is it a new/different interface for KVM?

> Also, kvm will support 2nd DAWR only if CPU_FTR_DAWR1 is set.

In general QEMU wants to be able to control all aspects of the virtual
machine presented to the guest, meaning that just because a host has a
particular hardware capability does not mean we should automatically
present that capability to the guest.

In this case, QEMU will want a way to control whether the guest sees
the availability of the second DAWR/X registers or not, i.e. whether a
H_SET_MODE to set DAWR[X]1 will succeed or fail.

Paul.

Re: [PATCH 0/7] powerpc/watchpoint: 2nd DAWR kvm enablement + selftests

[Paul Mackerras]

On Thu, Jul 23, 2020 at 03:50:51PM +0530, Ravi Bangoria wrote:
> Patch #1, #2 and #3 enables p10 2nd DAWR feature for Book3S kvm guest. DAWR
> is a hypervisor resource and thus H_SET_MODE hcall is used to set/unset it.
> A new case H_SET_MODE_RESOURCE_SET_DAWR1 is introduced in H_SET_MODE hcall
> for setting/unsetting 2nd DAWR. Also, new capability KVM_CAP_PPC_DAWR1 has
> been added to query 2nd DAWR support via kvm ioctl.
> 
> This feature also needs to be enabled in Qemu to really use it. I'll reply
> link to qemu patches once I post them in qemu-devel mailing list.
> 
> Patch #4, #5, #6 and #7 adds selftests to test 2nd DAWR.

If/when you resubmit these patches, please split the KVM patches into
a separate series, since the KVM patches would go via my tree whereas
I expect the selftests/powerpc patches would go through Michael
Ellerman's tree.

Paul.

Re: [PATCH 2/7] powerpc/watchpoint/kvm: Add infrastructure to support 2nd DAWR

[Ravi Bangoria]

Hi Paul,

On 9/2/20 7:31 AM, Paul Mackerras wrote:
> On Thu, Jul 23, 2020 at 03:50:53PM +0530, Ravi Bangoria wrote:
>> kvm code assumes single DAWR everywhere. Add code to support 2nd DAWR.
>> DAWR is a hypervisor resource and thus H_SET_MODE hcall is used to set/
>> unset it. Introduce new case H_SET_MODE_RESOURCE_SET_DAWR1 for 2nd DAWR.
> 
> Is this the same interface as will be defined in PAPR and available
> under PowerVM, or is it a new/different interface for KVM?

Yes, kvm hcall interface for 2nd DAWR is same as PowerVM, as defined in PAPR.

> 
>> Also, kvm will support 2nd DAWR only if CPU_FTR_DAWR1 is set.
> 
> In general QEMU wants to be able to control all aspects of the virtual
> machine presented to the guest, meaning that just because a host has a
> particular hardware capability does not mean we should automatically
> present that capability to the guest.
> 
> In this case, QEMU will want a way to control whether the guest sees
> the availability of the second DAWR/X registers or not, i.e. whether a
> H_SET_MODE to set DAWR[X]1 will succeed or fail.

Patch #3 adds new kvm capability KVM_CAP_PPC_DAWR1 that can be checked
by Qemu. Also, as suggested by David in Qemu patch[1], I'm planning to
add new machine capability in Qemu:

   -machine cap-dawr1=ON/OFF

cap-dawr1 will be default ON when PPC_FEATURE2_ARCH_3_10 is set and OFF
otherwise.

Is this correct approach?

[1]: https://lore.kernel.org/kvm/20200724045613.GA8983@umbus.fritz.box

Thanks,
Ravi

Re: [PATCH 1/7] powerpc/watchpoint/kvm: Rename current DAWR macros and variables

[Ravi Bangoria]

Hi Paul,

On 9/2/20 7:19 AM, Paul Mackerras wrote:
> On Thu, Jul 23, 2020 at 03:50:52PM +0530, Ravi Bangoria wrote:
>> Power10 is introducing second DAWR. Use real register names (with
>> suffix 0) from ISA for current macros and variables used by kvm.
> 
> Most of this looks fine, but I think we should not change the existing
> names in arch/powerpc/include/uapi/asm/kvm.h (and therefore also
> Documentation/virt/kvm/api.rst).

Missed that I'm changing uapi. I'll rename only those macros/variables
which are not uapi.

Thanks,
Ravi

Re: [PATCH 2/7] powerpc/watchpoint/kvm: Add infrastructure to support 2nd DAWR

[Ravi Bangoria]

Hi Paul,

> diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h
> index 33793444144c..03f401d7be41 100644
> --- a/arch/powerpc/include/asm/hvcall.h
> +++ b/arch/powerpc/include/asm/hvcall.h
> @@ -538,6 +538,8 @@ struct hv_guest_state {
>   	s64 tb_offset;
>   	u64 dawr0;
>   	u64 dawrx0;
> +	u64 dawr1;
> +	u64 dawrx1;
>   	u64 ciabr;
>   	u64 hdec_expiry;
>   	u64 purr;

After this struct, there is a macro HV_GUEST_STATE_VERSION, I guess that
also needs to be incremented because I'm adding new members in the struct?

Thanks,
Ravi

Re: [PATCH 0/7] powerpc/watchpoint: 2nd DAWR kvm enablement + selftests

[Ravi Bangoria]

Hi Paul,

On 9/2/20 8:02 AM, Paul Mackerras wrote:
> On Thu, Jul 23, 2020 at 03:50:51PM +0530, Ravi Bangoria wrote:
>> Patch #1, #2 and #3 enables p10 2nd DAWR feature for Book3S kvm guest. DAWR
>> is a hypervisor resource and thus H_SET_MODE hcall is used to set/unset it.
>> A new case H_SET_MODE_RESOURCE_SET_DAWR1 is introduced in H_SET_MODE hcall
>> for setting/unsetting 2nd DAWR. Also, new capability KVM_CAP_PPC_DAWR1 has
>> been added to query 2nd DAWR support via kvm ioctl.
>>
>> This feature also needs to be enabled in Qemu to really use it. I'll reply
>> link to qemu patches once I post them in qemu-devel mailing list.
>>
>> Patch #4, #5, #6 and #7 adds selftests to test 2nd DAWR.
> 
> If/when you resubmit these patches, please split the KVM patches into
> a separate series, since the KVM patches would go via my tree whereas
> I expect the selftests/powerpc patches would go through Michael
> Ellerman's tree.

Sure. Will split it.

Thanks,
Ravi