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From: David Gibson <david@gibson.dropbear.id.au>
To: paulus@samba.org, benh@kernel.crashing.org,
	michael@ellerman.id.au, bharata@linux.vnet.ibm.com
Cc: thuth@redhat.com, lvivier@redhat.com,
	linuxppc-dev@lists.ozlabs.org,
	David Gibson <david@gibson.dropbear.id.au>
Subject: [RFCv2 1/4] pseries: Add hypercall wrappers for hash page table resizing
Date: Mon, 11 Jan 2016 16:52:30 +1100	[thread overview]
Message-ID: <1452491553-26153-2-git-send-email-david@gibson.dropbear.id.au> (raw)
In-Reply-To: <1452491553-26153-1-git-send-email-david@gibson.dropbear.id.au>

This adds the hypercall numbers and wrapper functions for the hash page
table resizing hypercalls.

These are experimental "platform specific" values for now, until we have a
formal PAPR update.

It also adds a new firmware feature flat to track the presence of the
HPT resizing calls.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 arch/powerpc/include/asm/firmware.h       |  5 +++--
 arch/powerpc/include/asm/hvcall.h         |  2 ++
 arch/powerpc/include/asm/plpar_wrappers.h | 12 ++++++++++++
 arch/powerpc/platforms/pseries/firmware.c |  1 +
 4 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/firmware.h b/arch/powerpc/include/asm/firmware.h
index e05808a..339f71d 100644
--- a/arch/powerpc/include/asm/firmware.h
+++ b/arch/powerpc/include/asm/firmware.h
@@ -42,7 +42,7 @@
 #define FW_FEATURE_SPLPAR	ASM_CONST(0x0000000000100000)
 #define FW_FEATURE_LPAR		ASM_CONST(0x0000000000400000)
 #define FW_FEATURE_PS3_LV1	ASM_CONST(0x0000000000800000)
-/* Free				ASM_CONST(0x0000000001000000) */
+#define FW_FEATURE_HPT_RESIZE	ASM_CONST(0x0000000001000000)
 #define FW_FEATURE_CMO		ASM_CONST(0x0000000002000000)
 #define FW_FEATURE_VPHN		ASM_CONST(0x0000000004000000)
 #define FW_FEATURE_XCMO		ASM_CONST(0x0000000008000000)
@@ -68,7 +68,8 @@ enum {
 		FW_FEATURE_MULTITCE | FW_FEATURE_SPLPAR | FW_FEATURE_LPAR |
 		FW_FEATURE_CMO | FW_FEATURE_VPHN | FW_FEATURE_XCMO |
 		FW_FEATURE_SET_MODE | FW_FEATURE_BEST_ENERGY |
-		FW_FEATURE_TYPE1_AFFINITY | FW_FEATURE_PRRN,
+		FW_FEATURE_TYPE1_AFFINITY | FW_FEATURE_PRRN |
+		FW_FEATURE_HPT_RESIZE,
 	FW_FEATURE_PSERIES_ALWAYS = 0,
 	FW_FEATURE_POWERNV_POSSIBLE = FW_FEATURE_OPAL | FW_FEATURE_OPALv2 |
 		FW_FEATURE_OPALv3,
diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h
index 85bc8c0..ae1fcb7 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -273,6 +273,8 @@
 
 /* Platform specific hcalls, used by KVM */
 #define H_RTAS			0xf000
+#define H_RESIZE_HPT_PREPARE	0xf003
+#define H_RESIZE_HPT_COMMIT	0xf004
 
 /* "Platform specific hcalls", provided by PHYP */
 #define H_GET_24X7_CATALOG_PAGE	0xF078
diff --git a/arch/powerpc/include/asm/plpar_wrappers.h b/arch/powerpc/include/asm/plpar_wrappers.h
index 67859ed..8f1d8fe 100644
--- a/arch/powerpc/include/asm/plpar_wrappers.h
+++ b/arch/powerpc/include/asm/plpar_wrappers.h
@@ -225,6 +225,18 @@ static inline long plpar_pte_protect(unsigned long flags, unsigned long ptex,
 	return plpar_hcall_norets(H_PROTECT, flags, ptex, avpn);
 }
 
+static inline long plpar_resize_hpt_prepare(unsigned long flags,
+					    unsigned long shift)
+{
+	return plpar_hcall_norets(H_RESIZE_HPT_PREPARE, flags, shift);
+}
+
+static inline long plpar_resize_hpt_commit(unsigned long flags,
+					   unsigned long shift)
+{
+	return plpar_hcall_norets(H_RESIZE_HPT_COMMIT, flags, shift);
+}
+
 static inline long plpar_tce_get(unsigned long liobn, unsigned long ioba,
 		unsigned long *tce_ret)
 {
diff --git a/arch/powerpc/platforms/pseries/firmware.c b/arch/powerpc/platforms/pseries/firmware.c
index 8c80588..7b287be 100644
--- a/arch/powerpc/platforms/pseries/firmware.c
+++ b/arch/powerpc/platforms/pseries/firmware.c
@@ -63,6 +63,7 @@ hypertas_fw_features_table[] = {
 	{FW_FEATURE_VPHN,		"hcall-vphn"},
 	{FW_FEATURE_SET_MODE,		"hcall-set-mode"},
 	{FW_FEATURE_BEST_ENERGY,	"hcall-best-energy-1*"},
+	{FW_FEATURE_HPT_RESIZE,		"hcall-hpt-resize"},
 };
 
 /* Build up the firmware features bitmask using the contents of
-- 
2.5.0

  reply	other threads:[~2016-01-11  5:51 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-11  5:52 [RFCv2 0/4] Prototype PAPR hash page table resizing (guest side) David Gibson
2016-01-11  5:52 ` David Gibson [this message]
2016-01-11  5:52 ` [RFCv2 2/4] pseries: Add support for hash table resizing David Gibson
2016-01-11  5:52 ` [RFCv2 3/4] pseries: debugfs hook to trigger a hash page table resize David Gibson
2016-01-11  5:52 ` [RFCv2 4/4] pseries: Advertise HPT resizing support via CAS David Gibson

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