Cop2 save/restore for XLR/XLP
cover Cop2 save/restore for XLR/XLP
This patchset is to generalize the COP2 save/restore implemented for Octeon and use it for Netlogic XLR/XLP.
Patch 1 and 2 of the series affects the Octeon platform as well, so please let me know if there are any suggestions/comments.
Thanks,
JC.
Jayachandran C (5):
MIPS: Move cop2 save/restore to switch_to()
MIPS: Allow kernel to use coprocessor 2
MIPS: Netlogic: Fix nlm_read_c2_status() definition
MIPS: Netlogic: rename nlm_cop2_save/restore
MIPS: Netlogic: COP2 save/restore code
arch/mips/include/asm/cop2.h | 29 ++++++++ arch/mips/include/asm/netlogic/xlr/fmn.h | 13 ++-- arch/mips/include/asm/processor.h | 30 +++++--- arch/mips/include/asm/switch_to.h | 19 ++++- arch/mips/kernel/octeon_switch.S | 27 ------- arch/mips/kernel/traps.c | 15 ++-- arch/mips/netlogic/common/Makefile | 1 + arch/mips/netlogic/common/cop2-ex.c | 113 ++++++++++++++++++++++++++++++ arch/mips/netlogic/xlr/fmn.c | 18 ++--- 9 files changed, 202 insertions(+), 63 deletions(-) create mode 100644 arch/mips/netlogic/common/cop2-ex.c
Signature · 1 line
1.7.9.5
PATCH 1/5 MIPS: Move cop2 save/restore to switch_to()
Move the common code in saving and restoring platform specific COP2 registers to switch_to. This will make supporting new platforms (like Netlogic XLR/XLP) easier.
The platform specific COP2 definitions are to be specified in asm/processor.h and in asm/cop2.h.
Signed-off-by Jayachandran C <[email protected]>
--- arch/mips/include/asm/cop2.h | 19 +++++++++++++++++++ arch/mips/include/asm/processor.h | 18 +++++++----------- arch/mips/include/asm/switch_to.h | 19 ++++++++++++++++++- arch/mips/kernel/octeon_switch.S | 27 --------------------------- 4 files changed, 44 insertions(+), 39 deletions(-)
arch/mips/include/asm/cop2.h +19 -0
@@ -11,6 +11,25 @@#include <linux/notifier.h> +#if defined(CONFIG_CPU_CAVIUM_OCTEON ) + +extern void octeon_cop2_save (struct octeon_cop2_state *); +extern void octeon_cop2_restore (struct octeon_cop2_state *); + +#define cop2_save (r) octeon_cop2_save(r) +#define cop2_restore (r) octeon_cop2_restore(r) + +#define cop2_present 1 +#define cop2_lazy_restore 1 + +#else + +#define cop2_present 0 +#define cop2_lazy_restore 0 +#define cop2_save (r) +#define cop2_restore (r) +#endif +enum cu2_ops {CU2_EXCEPTION ,CU2_LWC2_OP ,
arch/mips/include/asm/processor.h +7 -11
@@ -133,7 +133,7 @@ union mips_watch_reg_state {struct mips3264_watch_reg_state mips3264; }; -#ifdef CONFIG_CPU_CAVIUM_OCTEON +#if defined(CONFIG_CPU_CAVIUM_OCTEON ) struct octeon_cop2_state {/* DMFC2 rt, 0x0201 */
@@ -178,13 +178,16 @@ struct octeon_cop2_state {/* DMFC2 rt, 0x025A; DMFC2 rt, 0x025B - Pass2 */ unsigned long cop2_gfm_result[2 ]; }; -#define INIT_OCTEON_COP2 {0,} +#define COP2_INIT \ + .cp2 = {0,},struct octeon_cvmseg_state {unsigned long cvmseg[CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE ] [cpu_dcache_line_size () /sizeof (unsigned long )]; }; +#else +#define COP2_INIT #endif typedef struct {
@@ -241,13 +244,6 @@ struct thread_struct {#define FPAFF_INIT #endif /* CONFIG_MIPS_MT_FPAFF */ -#ifdef CONFIG_CPU_CAVIUM_OCTEON -#define OCTEON_INIT \ - .cp2 = INIT_OCTEON_COP2, -#else -#define OCTEON_INIT -#endif /* CONFIG_CPU_CAVIUM_OCTEON */ -#define INIT_THREAD { \/* \ * Saved main processor registers \
@@ -296,9 +292,9 @@ struct thread_struct { .cp0_baduaddr = 0, \ .error_code = 0, \/* \ -* Cavium Octeon specifics (null if not Octeon) \ +* Platform specific cop2 registers(null if no COP2) \ */ \ - OCTEON_INIT \ + COP2_INIT \ }struct task_struct ;
arch/mips/include/asm/switch_to.h +18 -1
@@ -15,6 +15,7 @@#include <asm/cpu-features.h> #include <asm/watch.h> #include <asm/dsp.h> +#include <asm/cop2.h> struct task_struct ;
@@ -66,10 +67,18 @@ do { \#define switch_to (prev, next, last) \ do { \ - u32 __usedfpu; \ + u32 __usedfpu, __c0_stat; \ __mips_mt_fpaff_switch_to(prev); \ if (cpu_has_dsp) \ __save_dsp(prev); \ + if (cop2_present && (KSTK_STATUS(prev) & ST0_CU2)) { \ + if (cop2_lazy_restore) \ + KSTK_STATUS(prev) &= ~ST0_CU2; \ + __c0_stat = read_c0_status(); \ + write_c0_status(__c0_stat | ST0_CU2); \ + cop2_save(&prev->thread.cp2); \ + write_c0_status(__c0_stat & ~ST0_CU2); \ + } \ __clear_software_ll_bit(); \ __usedfpu = test_and_clear_tsk_thread_flag(prev, TIF_USEDFPU); \ (last) = resume(prev, next, task_thread_info(next), __usedfpu); \
@@ -77,6 +86,14 @@ do { \#define finish_arch_switch (prev) \ do { \ + u32 __c0_stat; \ + if (cop2_present && !cop2_lazy_restore && \ + (KSTK_STATUS(current) & ST0_CU2)) { \ + __c0_stat = read_c0_status(); \ + write_c0_status(__c0_stat | ST0_CU2); \ + cop2_restore(¤t->thread.cp2); \ + write_c0_status(__c0_stat & ~ST0_CU2); \ + } \ if (cpu_has_dsp) \ __restore_dsp(current); \ if (cpu_has_userlocal) \
arch/mips/kernel/octeon_switch.S +0 -27
@@ -40,33 +40,6 @@ cpu_save_nonscratch a0 LONG_S ra, THREAD_REG31(a0) - /* check if we need to save COP2 registers */ - PTR_L t2, TASK_THREAD_INFO(a0) - LONG_L t0, ST_OFF(t2) - bbit0 t0, 30, 1f - - /* Disable COP2 in the stored process state */ - li t1, ST0_CU2 - xor t0, t1 - LONG_S t0, ST_OFF(t2) - - /* Enable COP2 so we can save it */ - mfc0 t0, CP0_STATUS - or t0, t1 - mtc0 t0, CP0_STATUS - - /* Save COP2 */ - daddu a0, THREAD_CP2 - jal octeon_cop2_save - dsubu a0, THREAD_CP2 - - /* Disable COP2 now that we are done */ - mfc0 t0, CP0_STATUS - li t1, ST0_CU2 - xor t0, t1 - mtc0 t0, CP0_STATUS - -1: #if CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE > 0 /* Check if we need to store CVMSEG state */ mfc0 t0, $11,7 /* CvmMemCtl */
Signature · 1 line
1.7.9.5
PATCH 2/5 MIPS: Allow kernel to use coprocessor 2
In reply to Jayachandran CKernel threads should be able to use COP2 if the platform needs it. Do not call die_if_kernel() for a coprocessor unusable exception if the exception due to COP2 usage. Instead, the default notifier for COP2 exceptions is updated to call die_if_kernel.
Signed-off-by Jayachandran C <[email protected]>
--- arch/mips/kernel/traps.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-)
arch/mips/kernel/traps.c +5 -10
@@ -970,15 +970,9 @@ static int default_cu2_call(struct notifier_block *nfb, unsigned long action, {struct pt_regs *regs = data; -switch (action) { -default : -die_if_kernel ("Unhandled kernel unaligned access or invalid " +die_if_kernel ("COP2: Unhandled kernel unaligned access or invalid " "instruction" , regs); -/* Fall through */ - -case CU2_EXCEPTION : -force_sig (SIGILL , current); - } +force_sig (SIGILL , current);return NOTIFY_OK ; }
@@ -992,10 +986,11 @@ asmlinkage void do_cpu(struct pt_regs *regs)int status;unsigned long __maybe_unused flags; -die_if_kernel ("do_cpu invoked from kernel context!" , regs); - cpid = (regs->cp0_cause >>CAUSEB_CE ) &3 ; +if (cpid !=2 ) +die_if_kernel ("do_cpu invoked from kernel context!" , regs); +switch (cpid) {case 0 : epc = (unsigned int __user *)exception_epc (regs);
Signature · 1 line
1.7.9.5
PATCH 3/5 MIPS: Netlogic: Fix nlm_read_c2_status() definition
In reply to Jayachandran CThe sel argument os nlm_read_c2_status() was not used and the macro returned the sel 0 in all cases. Fix this by defining two macros:nlm_read_c2_status0() and nlm_read_c2_status1() to return the two status registers.
Add functions to write to the status registers as well.
Signed-off-by Jayachandran C <[email protected]>
--- arch/mips/include/asm/netlogic/xlr/fmn.h | 9 ++++++--- arch/mips/netlogic/xlr/fmn.c | 2 +- 2 files changed, 7 insertions(+), 4 deletions(-)
arch/mips/include/asm/netlogic/xlr/fmn.h +6 -3
@@ -175,7 +175,10 @@#define nlm_write_c2_cc14 (s, v) __write_32bit_c2_register($30, s, v)#define nlm_write_c2_cc15 (s, v) __write_32bit_c2_register($31, s, v) -#define nlm_read_c2_status (sel) __read_32bit_c2_register($2, 0) +#define nlm_read_c2_status0 () __read_32bit_c2_register($2, 0) +#define nlm_write_c2_status0 (v) __write_32bit_c2_register($2, 0, v) +#define nlm_read_c2_status1 () __read_32bit_c2_register($2, 1) +#define nlm_write_c2_status1 (v) __write_32bit_c2_register($2, 1, v)#define nlm_read_c2_config () __read_32bit_c2_register($3, 0)#define nlm_write_c2_config (v) __write_32bit_c2_register($3, 0, v)#define nlm_read_c2_bucksize (b) __read_32bit_c2_register($4, b)
@@ -296,7 +299,7 @@ static inline int nlm_fmn_send(unsigned int size, unsigned int code,*/ for (i =0 ; i <8 ; i++) {nlm_msgsnd (dest); - status =nlm_read_c2_status (0 ); + status =nlm_read_c2_status0 ();if ((status &0x2 ) ==1 )pr_info ("Send pending fail!\n" );if ((status &0x4 ) ==0 )
@@ -316,7 +319,7 @@ static inline int nlm_fmn_receive(int bucket, int *size, int *code, int *stid,/* wait for load pending to clear */ do { - status =nlm_read_c2_status (1 ); + status =nlm_read_c2_status0 (); }while ((status &0x08 ) !=0 );/* receive error bits */
arch/mips/netlogic/xlr/fmn.c +1 -1
@@ -80,7 +80,7 @@ static irqreturn_t fmn_message_handler(int irq, void *data)while (1 ) {/* 8 bkts per core, [24:31] each bit represents one bucket * Bit is Zero if bucket is not empty */ - bkt_status = (nlm_read_c2_status () >>24 ) &0xff ; + bkt_status = (nlm_read_c2_status0 () >>24 ) &0xff ;if (bkt_status ==0xff )break ;for (bucket =0 ; bucket <8 ; bucket++) {
Signature · 1 line
1.7.9.5
PATCH 4/5 MIPS: Netlogic: rename nlm_cop2_save/restore
In reply to Jayachandran CRename macro nlm_cop2_enable() to nlm_cop2_enable_irqsave() and the macro nlm_cop2_restore to nlm_cop2_disable_irqrestore(). The new names will reflect the functionality better, and will make nlm_cop2_restore() available to be used later in COP2 save/restore patch.
Signed-off-by Jayachandran C <[email protected]>
--- arch/mips/include/asm/netlogic/xlr/fmn.h | 4 ++-- arch/mips/netlogic/xlr/fmn.c | 16 ++++++++-------- 2 files changed, 10 insertions(+), 10 deletions(-)
arch/mips/include/asm/netlogic/xlr/fmn.h +2 -2
@@ -240,7 +240,7 @@ static inline void nlm_msgwait(unsigned int mask)/* * Disable interrupts and enable COP2 access */ -static inline uint32_t nlm_cop2_enable (void ) +static inline uint32_t nlm_cop2_enable_irqsave (void ) {uint32_t sr =read_c0_status ();
@@ -248,7 +248,7 @@ static inline uint32_t nlm_cop2_enable(void)return sr; } -static inline void nlm_cop2_restore (uint32_t sr) +static inline void nlm_cop2_disable_irq_restore (uint32_t sr) {write_c0_status (sr); }
arch/mips/netlogic/xlr/fmn.c +8 -8
@@ -74,7 +74,7 @@ static irqreturn_t fmn_message_handler(int irq, void *data)struct nlm_fmn_msg msg;uint32_t mflags, bkt_status; - mflags =nlm_cop2_enable (); + mflags =nlm_cop2_enable_irqsave ();/* Disable message ring interrupt */ nlm_fmn_setup_intr (irq,0 );while (1 ) {
@@ -97,16 +97,16 @@ static irqreturn_t fmn_message_handler(int irq, void *data)pr_warn ("No msgring handler for stnid %d\n" , src_stnid); else { -nlm_cop2_restore (mflags); +nlm_cop2_disable_irq_restore (mflags); hndlr->action (bucket, src_stnid, size, code, &msg, hndlr->arg); - mflags =nlm_cop2_enable (); + mflags =nlm_cop2_enable_irqsave (); } } };/* Enable message ring intr, to any thread in core */ nlm_fmn_setup_intr (irq, (1 << nlm_threads_per_core) -1 ); -nlm_cop2_restore (mflags); +nlm_cop2_disable_irq_restore (mflags);return IRQ_HANDLED ; }
@@ -128,7 +128,7 @@ void xlr_percpu_fmn_init(void) bucket_sizes = xlr_board_fmn_config.bucket_size; cpu_fmn_info = &xlr_board_fmn_config.cpu[id]; - flags =nlm_cop2_enable (); + flags =nlm_cop2_enable_irqsave ();/* Setup bucket sizes for the core. */ nlm_write_c2_bucksize (0 , bucket_sizes[id *8 +0 ]);
@@ -166,7 +166,7 @@ void xlr_percpu_fmn_init(void)/* enable FMN interrupts on this CPU */ nlm_fmn_setup_intr (IRQ_FMN , (1 << nlm_threads_per_core) -1 ); -nlm_cop2_restore (flags); +nlm_cop2_disable_irq_restore (flags); }
@@ -198,7 +198,7 @@ void nlm_setup_fmn_irq(void)/* setup irq only once */ setup_irq (IRQ_FMN , &fmn_irqaction); - flags =nlm_cop2_enable (); + flags =nlm_cop2_enable_irqsave ();nlm_fmn_setup_intr (IRQ_FMN , (1 << nlm_threads_per_core) -1 ); -nlm_cop2_restore (flags); +nlm_cop2_disable_irq_restore (flags); }
Signature · 1 line
1.7.9.5
PATCH 5/5 MIPS: Netlogic: COP2 save/restore code
In reply to Jayachandran CAdd COP2 register state struct, and add functions to save and restore COP2 at context switch.
Signed-off-by Jayachandran C <[email protected]>
--- arch/mips/include/asm/cop2.h | 10 ++++ arch/mips/include/asm/processor.h | 12 ++++ arch/mips/netlogic/common/Makefile | 1 + arch/mips/netlogic/common/cop2-ex.c | 113 +++++++++++++++++++++++++++++++++++ 4 files changed, 136 insertions(+) create mode 100644 arch/mips/netlogic/common/cop2-ex.c
arch/mips/include/asm/cop2.h +10 -0
@@ -22,6 +22,16 @@ extern void octeon_cop2_restore(struct octeon_cop2_state *);#define cop2_present 1#define cop2_lazy_restore 1 +#elif defined(CONFIG_CPU_XLR ) || defined(CONFIG_CPU_XLP ) + +extern void nlm_cop2_save (struct nlm_cop2_state *); +extern void nlm_cop2_restore (struct nlm_cop2_state *); +#define cop2_save (r) nlm_cop2_save(r) +#define cop2_restore (r) nlm_cop2_restore(r) + +#define cop2_present 1 +#define cop2_lazy_restore 0 +#else #define cop2_present 0
arch/mips/include/asm/processor.h +12 -0
@@ -186,6 +186,15 @@ struct octeon_cvmseg_state { [cpu_dcache_line_size() / sizeof(unsigned long)]; }; +#elif defined(CONFIG_CPU_XLR) || defined(CONFIG_CPU_XLP) +struct nlm_cop2_state { +u64 rx[4 ]; +u64 tx[4 ]; +u32 status0; +}; + +#define COP2_INIT \ + .cp2 = {{0}, {0}, 0},#else #define COP2_INIT #endif
@@ -233,6 +242,9 @@ struct thread_struct { struct octeon_cop2_state cp2 __attribute__ ((__aligned__(128))); struct octeon_cvmseg_state cvmseg __attribute__ ((__aligned__(128)));#endif +#if defined(CONFIG_CPU_XLR ) || defined(CONFIG_CPU_XLP ) +struct nlm_cop2_state cp2; +#endif struct mips_abi *abi; };
arch/mips/netlogic/common/Makefile +1 -0
@@ -1,3 +1,4 @@ obj-y += irq.o time.o obj-$(CONFIG_SMP) += smp.o smpboot.o obj-$(CONFIG_EARLY_PRINTK) += earlycons.o +obj-y += cop2-ex.o
arch/mips/netlogic/common/cop2-ex.c new file +113 -0
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1.7.9.5