path: root/arch/powerpc/include
diff options
authorAlexey Kardashevskiy <aik@au1.ibm.com>2011-03-02 15:18:48 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-04-27 14:18:19 +1000
commitefcac6589a277c10060e4be44b9455cf43838dc1 (patch)
treed2236c1e9385baff297f0652c5a22b74f6acb149 /arch/powerpc/include
parentf0aae3238fc1c28b543cbaaa0e7c5d57685f5f89 (diff)
powerpc: Per process DSCR + some fixes (try#4)
The DSCR (aka Data Stream Control Register) is supported on some server PowerPC chips and allow some control over the prefetch of data streams. This patch allows the value to be specified per thread by emulating the corresponding mfspr and mtspr instructions. Children of such threads inherit the value. Other threads use a default value that can be specified in sysfs - /sys/devices/system/cpu/dscr_default. If a thread starts with non default value in the sysfs entry, all children threads inherit this non default value even if the sysfs value is changed later. Signed-off-by: Alexey Kardashevskiy <aik@au1.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include')
3 files changed, 12 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/emulated_ops.h b/arch/powerpc/include/asm/emulated_ops.h
index f0fb4fc1f6e..45921672b97 100644
--- a/arch/powerpc/include/asm/emulated_ops.h
+++ b/arch/powerpc/include/asm/emulated_ops.h
@@ -52,6 +52,10 @@ extern struct ppc_emulated {
struct ppc_emulated_entry vsx;
+#ifdef CONFIG_PPC64
+ struct ppc_emulated_entry mfdscr;
+ struct ppc_emulated_entry mtdscr;
} ppc_emulated;
extern u32 ppc_warn_emulated;
diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
index 3e25b258568..e472659d906 100644
--- a/arch/powerpc/include/asm/ppc-opcode.h
+++ b/arch/powerpc/include/asm/ppc-opcode.h
@@ -41,6 +41,10 @@
#define PPC_INST_RFCI 0x4c000066
#define PPC_INST_RFDI 0x4c00004e
#define PPC_INST_RFMCI 0x4c00004c
+#define PPC_INST_MFSPR_DSCR 0x7c1102a6
+#define PPC_INST_MFSPR_DSCR_MASK 0xfc1fffff
+#define PPC_INST_MTSPR_DSCR 0x7c1103a6
+#define PPC_INST_MTSPR_DSCR_MASK 0xfc1fffff
#define PPC_INST_STRING 0x7c00042a
#define PPC_INST_STRING_MASK 0xfc0007fe
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index de1967a1ff5..d50c2b6d9bc 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -238,6 +238,10 @@ struct thread_struct {
void* kvm_shadow_vcpu; /* KVM internal data */
+#ifdef CONFIG_PPC64
+ unsigned long dscr;
+ int dscr_inherit;