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Message-ID: <20110307115046.GF8194@linux.vnet.ibm.com>
Date: Mon, 7 Mar 2011 17:20:46 +0530
From: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To: stable@...nel.org
Cc: linux-kernel@...r.kernel.org, greg@...ah.com, anton@...ba.org,
benh@...nel.crashing.org
Subject: [PATCH 4/7] powerpc/pseries: Add hcall to read 4 ptes at a time in
real mode
powerpc/pseries: Add hcall to read 4 ptes at a time in real mode
Commit: f90ece28c1f5b3ec13fe481406857fe92f4bc7d1 upstream
This adds plpar_pte_read_4_raw() which can be used read 4 PTEs from
PHYP at a time, while in real mode.
It also creates a new hcall9 which can be used in real mode. It's the
same as plpar_hcall9 but minus the tracing hcall statistics which may
require variables outside the RMO.
Signed-off-by: Michael Neuling <mikey@...ling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Signed-off-by: Kamalesh babulal <kamalesh@...ux.vnet.ibm.com>
cc: Anton Blanchard <anton@...ba.org>
---
arch/powerpc/include/asm/hvcall.h | 1
arch/powerpc/platforms/pseries/hvCall.S | 38 ++++++++++++++++++++++++
arch/powerpc/platforms/pseries/plpar_wrappers.h | 18 +++++++++++
3 files changed, 57 insertions(+)
Index: b/arch/powerpc/include/asm/hvcall.h
===================================================================
--- a/arch/powerpc/include/asm/hvcall.h 2011-03-07 00:39:02.479557984 -0800
+++ b/arch/powerpc/include/asm/hvcall.h 2011-03-07 00:39:54.627591230 -0800
@@ -268,6 +268,7 @@
*/
#define PLPAR_HCALL9_BUFSIZE 9
long plpar_hcall9(unsigned long opcode, unsigned long *retbuf, ...);
+long plpar_hcall9_raw(unsigned long opcode, unsigned long *retbuf, ...);
/* For hcall instrumentation. One structure per-hcall, per-CPU */
struct hcall_stats {
Index: b/arch/powerpc/platforms/pseries/hvCall.S
===================================================================
--- a/arch/powerpc/platforms/pseries/hvCall.S 2011-03-07 00:39:57.707593225 -0800
+++ b/arch/powerpc/platforms/pseries/hvCall.S 2011-03-07 00:45:13.523789676 -0800
@@ -202,3 +202,41 @@
mtcrf 0xff,r0
blr /* return r3 = status */
+
+/* See plpar_hcall_raw to see why this is needed */
+_GLOBAL(plpar_hcall9_raw)
+ HMT_MEDIUM
+
+ mfcr r0
+ stw r0,8(r1)
+
+ std r4,STK_PARM(r4)(r1) /* Save ret buffer */
+
+ mr r4,r5
+ mr r5,r6
+ mr r6,r7
+ mr r7,r8
+ mr r8,r9
+ mr r9,r10
+ ld r10,STK_PARM(r11)(r1) /* put arg7 in R10 */
+ ld r11,STK_PARM(r12)(r1) /* put arg8 in R11 */
+ ld r12,STK_PARM(r13)(r1) /* put arg9 in R12 */
+
+ HVSC /* invoke the hypervisor */
+
+ mr r0,r12
+ ld r12,STK_PARM(r4)(r1)
+ std r4, 0(r12)
+ std r5, 8(r12)
+ std r6, 16(r12)
+ std r7, 24(r12)
+ std r8, 32(r12)
+ std r9, 40(r12)
+ std r10,48(r12)
+ std r11,56(r12)
+ std r0, 64(r12)
+
+ lwz r0,8(r1)
+ mtcrf 0xff,r0
+
+ blr /* return r3 = status */
Index: b/arch/powerpc/platforms/pseries/plpar_wrappers.h
===================================================================
--- a/arch/powerpc/platforms/pseries/plpar_wrappers.h 2011-03-07 00:45:28.363798700 -0800
+++ b/arch/powerpc/platforms/pseries/plpar_wrappers.h 2011-03-07 02:10:59.321850879 -0800
@@ -169,6 +169,24 @@
return rc;
}
+/*
+ * plpar_pte_read_4_raw can be called in real mode.
+ * ptes must be 8*sizeof(unsigned long)
+ */
+static inline long plpar_pte_read_4_raw(unsigned long flags, unsigned long ptex,
+ unsigned long *ptes)
+
+{
+ long rc;
+ unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
+
+ rc = plpar_hcall9_raw(H_READ, retbuf, flags | H_READ_4, ptex);
+
+ memcpy(ptes, retbuf, 8*sizeof(unsigned long));
+
+ return rc;
+}
+
static inline long plpar_pte_protect(unsigned long flags, unsigned long ptex,
unsigned long avpn)
{
--
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