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ARM: vfp: rename last_VFP_context to vfp_current_hw_state 

Rename the slightly confusing 'last_VFP_context' variable to be more
descriptive of what it actually is.  This variable stores a pointer
to the current owner's vfpstate structure for the context held in the
VFP hardware.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2011-07-09 13:44:04 +01:00
parent fe0d42203c
commit af61bdf035
2 changed files with 26 additions and 20 deletions
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10
arch/arm/vfp/vfphw.S
View File

@ -77,9 +77,9 @@ ENTRY(vfp_support_entry)
bne look_for_VFP_exceptions @ VFP is already enabled bne look_for_VFP_exceptions @ VFP is already enabled
DBGSTR1 "enable %x", r10 DBGSTR1 "enable %x", r10
ldr r3, last_VFP_context_address ldr r3, vfp_current_hw_state_address
orr r1, r1, #FPEXC_EN @ user FPEXC has the enable bit set orr r1, r1, #FPEXC_EN @ user FPEXC has the enable bit set
ldr r4, [r3, r11, lsl #2] @ last_VFP_context pointer ldr r4, [r3, r11, lsl #2] @ vfp_current_hw_state pointer
bic r5, r1, #FPEXC_EX @ make sure exceptions are disabled bic r5, r1, #FPEXC_EX @ make sure exceptions are disabled
cmp r4, r10 cmp r4, r10
beq check_for_exception @ we are returning to the same beq check_for_exception @ we are returning to the same
@ -116,7 +116,7 @@ ENTRY(vfp_support_entry)
no_old_VFP_process: no_old_VFP_process:
DBGSTR1 "load state %p", r10 DBGSTR1 "load state %p", r10
str r10, [r3, r11, lsl #2] @ update the last_VFP_context pointer str r10, [r3, r11, lsl #2] @ update the vfp_current_hw_state pointer
@ Load the saved state back into the VFP @ Load the saved state back into the VFP
VFPFLDMIA r10, r5 @ reload the working registers while VFPFLDMIA r10, r5 @ reload the working registers while
@ FPEXC is in a safe state @ FPEXC is in a safe state
@ -207,8 +207,8 @@ ENTRY(vfp_save_state)
ENDPROC(vfp_save_state) ENDPROC(vfp_save_state)
.align .align
last_VFP_context_address: vfp_current_hw_state_address:
.word last_VFP_context .word vfp_current_hw_state
.macro tbl_branch, base, tmp, shift .macro tbl_branch, base, tmp, shift
#ifdef CONFIG_THUMB2_KERNEL #ifdef CONFIG_THUMB2_KERNEL

36
arch/arm/vfp/vfpmodule.c
View File

@ -33,7 +33,13 @@ void vfp_support_entry(void);
void vfp_null_entry(void); void vfp_null_entry(void);
void (*vfp_vector)(void) = vfp_null_entry; void (*vfp_vector)(void) = vfp_null_entry;
union vfp_state *last_VFP_context[NR_CPUS];
/*
* The pointer to the vfpstate structure of the thread which currently
* owns the context held in the VFP hardware, or NULL if the hardware
* context is invalid.
*/
union vfp_state *vfp_current_hw_state[NR_CPUS];
/* /*
* Dual-use variable. * Dual-use variable.
@ -57,12 +63,12 @@ static void vfp_thread_flush(struct thread_info *thread)
/* /*
* Disable VFP to ensure we initialize it first. We must ensure * Disable VFP to ensure we initialize it first. We must ensure
* that the modification of last_VFP_context[] and hardware disable * that the modification of vfp_current_hw_state[] and hardware disable
* are done for the same CPU and without preemption. * are done for the same CPU and without preemption.
*/ */
cpu = get_cpu(); cpu = get_cpu();
if (last_VFP_context[cpu] == vfp) if (vfp_current_hw_state[cpu] == vfp)
last_VFP_context[cpu] = NULL; vfp_current_hw_state[cpu] = NULL;
fmxr(FPEXC, fmrx(FPEXC) & ~FPEXC_EN); fmxr(FPEXC, fmrx(FPEXC) & ~FPEXC_EN);
put_cpu(); put_cpu();
} }
@ -73,8 +79,8 @@ static void vfp_thread_exit(struct thread_info *thread)
union vfp_state *vfp = &thread->vfpstate; union vfp_state *vfp = &thread->vfpstate;
unsigned int cpu = get_cpu(); unsigned int cpu = get_cpu();
if (last_VFP_context[cpu] == vfp) if (vfp_current_hw_state[cpu] == vfp)
last_VFP_context[cpu] = NULL; vfp_current_hw_state[cpu] = NULL;
put_cpu(); put_cpu();
} }
@ -129,9 +135,9 @@ static int vfp_notifier(struct notifier_block *self, unsigned long cmd, void *v)
* case the thread migrates to a different CPU. The * case the thread migrates to a different CPU. The
* restoring is done lazily. * restoring is done lazily.
*/ */
if ((fpexc & FPEXC_EN) && last_VFP_context[cpu]) { if ((fpexc & FPEXC_EN) && vfp_current_hw_state[cpu]) {
vfp_save_state(last_VFP_context[cpu], fpexc); vfp_save_state(vfp_current_hw_state[cpu], fpexc);
last_VFP_context[cpu]->hard.cpu = cpu; vfp_current_hw_state[cpu]->hard.cpu = cpu;
} }
/* /*
* Thread migration, just force the reloading of the * Thread migration, just force the reloading of the
@ -139,7 +145,7 @@ static int vfp_notifier(struct notifier_block *self, unsigned long cmd, void *v)
* contain stale data. * contain stale data.
*/ */
if (thread->vfpstate.hard.cpu != cpu) if (thread->vfpstate.hard.cpu != cpu)
last_VFP_context[cpu] = NULL; vfp_current_hw_state[cpu] = NULL;
#endif #endif
/* /*
@ -415,7 +421,7 @@ static int vfp_pm_suspend(void)
} }
/* clear any information we had about last context state */ /* clear any information we had about last context state */
memset(last_VFP_context, 0, sizeof(last_VFP_context)); memset(vfp_current_hw_state, 0, sizeof(vfp_current_hw_state));
return 0; return 0;
} }
@ -451,7 +457,7 @@ void vfp_sync_hwstate(struct thread_info *thread)
* If the thread we're interested in is the current owner of the * If the thread we're interested in is the current owner of the
* hardware VFP state, then we need to save its state. * hardware VFP state, then we need to save its state.
*/ */
if (last_VFP_context[cpu] == &thread->vfpstate) { if (vfp_current_hw_state[cpu] == &thread->vfpstate) {
u32 fpexc = fmrx(FPEXC); u32 fpexc = fmrx(FPEXC);
/* /*
@ -473,7 +479,7 @@ void vfp_flush_hwstate(struct thread_info *thread)
* If the thread we're interested in is the current owner of the * If the thread we're interested in is the current owner of the
* hardware VFP state, then we need to save its state. * hardware VFP state, then we need to save its state.
*/ */
if (last_VFP_context[cpu] == &thread->vfpstate) { if (vfp_current_hw_state[cpu] == &thread->vfpstate) {
u32 fpexc = fmrx(FPEXC); u32 fpexc = fmrx(FPEXC);
fmxr(FPEXC, fpexc & ~FPEXC_EN); fmxr(FPEXC, fpexc & ~FPEXC_EN);
@ -482,7 +488,7 @@ void vfp_flush_hwstate(struct thread_info *thread)
* Set the context to NULL to force a reload the next time * Set the context to NULL to force a reload the next time
* the thread uses the VFP. * the thread uses the VFP.
*/ */
last_VFP_context[cpu] = NULL; vfp_current_hw_state[cpu] = NULL;
} }
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
@ -514,7 +520,7 @@ static int vfp_hotplug(struct notifier_block *b, unsigned long action,
{ {
if (action == CPU_DYING || action == CPU_DYING_FROZEN) { if (action == CPU_DYING || action == CPU_DYING_FROZEN) {
unsigned int cpu = (long)hcpu; unsigned int cpu = (long)hcpu;
last_VFP_context[cpu] = NULL; vfp_current_hw_state[cpu] = NULL;
} else if (action == CPU_STARTING || action == CPU_STARTING_FROZEN) } else if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
vfp_enable(NULL); vfp_enable(NULL);
return NOTIFY_OK; return NOTIFY_OK;