Commit 77f63b4d authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 

Pull powerpc fixes from Ben Herrenschmidt:
 "This includes small series from Michael Neuling to fix a couple of
  nasty remaining problems with the new Power8 support, also targeted at
  stable 3.10, without which some new userspace accessible registers
  aren't properly context switched, and in some case, can be clobbered
  by the user of transactional memory.

  Along with that, a few slightly more minor things, such as a missing
  Kconfig option to enable handling of denorm exceptions when not
  running under a hypervisor (or userspace will randomly crash when
  hitting denorms with the vector unit), some nasty bugs in the new
  pstore oops code, and other simple bug fixes worth having in now.

  Note: I picked up the two powerpc KVM fixes as Alex Graf asked me to
  handle KVM bits while he is on vacation.  However I'll let him decide
  whether they should go to -stable or not when he is back"

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
  powerpc/tm: Fix context switching TAR, PPR and DSCR SPRs
  powerpc: Save the TAR register earlier
  powerpc: Fix context switch DSCR on POWER8
  powerpc: Rework setting up H/FSCR bit definitions
  powerpc: Fix hypervisor facility unavaliable vector number
  powerpc/kvm/book3s_pr: Return appropriate error when allocation fails
  powerpc/kvm: Add signed type cast for comparation
  powerpc/eeh: Add missing procfs entry for PowerNV
  powerpc/pseries: Add backward compatibilty to read old kernel oops-log
  powerpc/pseries: Fix buffer overflow when reading from pstore
  powerpc: On POWERNV enable PPC_DENORMALISATION by default
parents 30b229bd 28e61cc4

arch/powerpc/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -566,7 +566,7 @@ config SCHED_SMT 
config PPC_DENORMALISATION

	bool "PowerPC denormalisation exception handling"

	depends on PPC_BOOK3S_64

	default "n"

	default "y" if PPC_POWERNV

	---help---

	  Add support for handling denormalisation of single precision

	  values.  Useful for bare metal only.  If unsure say Y here.

arch/powerpc/include/asm/processor.h

+4 −0
Original line number Diff line number Diff line
@@ -247,6 +247,10 @@ struct thread_struct { 
	unsigned long	tm_orig_msr;	/* Thread's MSR on ctx switch */

	struct pt_regs	ckpt_regs;	/* Checkpointed registers */



	unsigned long	tm_tar;

	unsigned long	tm_ppr;

	unsigned long	tm_dscr;



	/*

	 * Transactional FP and VSX 0-31 register set.

	 * NOTE: the sense of these is the opposite of the integer ckpt_regs!

arch/powerpc/include/asm/reg.h

+20 −11
Original line number Diff line number Diff line
@@ -254,19 +254,28 @@ 
#define SPRN_HRMOR	0x139	/* Real mode offset register */

#define SPRN_HSRR0	0x13A	/* Hypervisor Save/Restore 0 */

#define SPRN_HSRR1	0x13B	/* Hypervisor Save/Restore 1 */

/* HFSCR and FSCR bit numbers are the same */

#define FSCR_TAR_LG	8	/* Enable Target Address Register */

#define FSCR_EBB_LG	7	/* Enable Event Based Branching */

#define FSCR_TM_LG	5	/* Enable Transactional Memory */

#define FSCR_PM_LG	4	/* Enable prob/priv access to PMU SPRs */

#define FSCR_BHRB_LG	3	/* Enable Branch History Rolling Buffer*/

#define FSCR_DSCR_LG	2	/* Enable Data Stream Control Register */

#define FSCR_VECVSX_LG	1	/* Enable VMX/VSX  */

#define FSCR_FP_LG	0	/* Enable Floating Point */

#define SPRN_FSCR	0x099	/* Facility Status & Control Register */

#define   FSCR_TAR	(1 << (63-55)) /* Enable Target Address Register */

#define   FSCR_EBB	(1 << (63-56)) /* Enable Event Based Branching */

#define   FSCR_DSCR	(1 << (63-61)) /* Enable Data Stream Control Register */

#define   FSCR_TAR	__MASK(FSCR_TAR_LG)

#define   FSCR_EBB	__MASK(FSCR_EBB_LG)

#define   FSCR_DSCR	__MASK(FSCR_DSCR_LG)

#define SPRN_HFSCR	0xbe	/* HV=1 Facility Status & Control Register */

#define   HFSCR_TAR	(1 << (63-55)) /* Enable Target Address Register */

#define   HFSCR_EBB	(1 << (63-56)) /* Enable Event Based Branching */

#define   HFSCR_TM	(1 << (63-58)) /* Enable Transactional Memory */

#define   HFSCR_PM	(1 << (63-60)) /* Enable prob/priv access to PMU SPRs */

#define   HFSCR_BHRB	(1 << (63-59)) /* Enable Branch History Rolling Buffer*/

#define   HFSCR_DSCR	(1 << (63-61)) /* Enable Data Stream Control Register */

#define   HFSCR_VECVSX	(1 << (63-62)) /* Enable VMX/VSX  */

#define   HFSCR_FP	(1 << (63-63)) /* Enable Floating Point */

#define   HFSCR_TAR	__MASK(FSCR_TAR_LG)

#define   HFSCR_EBB	__MASK(FSCR_EBB_LG)

#define   HFSCR_TM	__MASK(FSCR_TM_LG)

#define   HFSCR_PM	__MASK(FSCR_PM_LG)

#define   HFSCR_BHRB	__MASK(FSCR_BHRB_LG)

#define   HFSCR_DSCR	__MASK(FSCR_DSCR_LG)

#define   HFSCR_VECVSX	__MASK(FSCR_VECVSX_LG)

#define   HFSCR_FP	__MASK(FSCR_FP_LG)

#define SPRN_TAR	0x32f	/* Target Address Register */

#define SPRN_LPCR	0x13E	/* LPAR Control Register */

#define   LPCR_VPM0	(1ul << (63-0))

arch/powerpc/include/asm/switch_to.h

+9 −0
Original line number Diff line number Diff line
@@ -15,6 +15,15 @@ extern struct task_struct *__switch_to(struct task_struct *, 
struct thread_struct;

extern struct task_struct *_switch(struct thread_struct *prev,

				   struct thread_struct *next);

#ifdef CONFIG_PPC_BOOK3S_64

static inline void save_tar(struct thread_struct *prev)

{

	if (cpu_has_feature(CPU_FTR_ARCH_207S))

		prev->tar = mfspr(SPRN_TAR);

}

#else

static inline void save_tar(struct thread_struct *prev) {}

#endif



extern void giveup_fpu(struct task_struct *);

extern void load_up_fpu(void);

arch/powerpc/kernel/asm-offsets.c

+3 −0
Original line number Diff line number Diff line
@@ -138,6 +138,9 @@ int main(void) 
	DEFINE(THREAD_TM_TFHAR, offsetof(struct thread_struct, tm_tfhar));

	DEFINE(THREAD_TM_TEXASR, offsetof(struct thread_struct, tm_texasr));

	DEFINE(THREAD_TM_TFIAR, offsetof(struct thread_struct, tm_tfiar));

	DEFINE(THREAD_TM_TAR, offsetof(struct thread_struct, tm_tar));

	DEFINE(THREAD_TM_PPR, offsetof(struct thread_struct, tm_ppr));

	DEFINE(THREAD_TM_DSCR, offsetof(struct thread_struct, tm_dscr));

	DEFINE(PT_CKPT_REGS, offsetof(struct thread_struct, ckpt_regs));

	DEFINE(THREAD_TRANSACT_VR0, offsetof(struct thread_struct,

					 transact_vr[0]));

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