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ARCv2: SLC: provide a line based flush routine for debugging 

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2017-08-01 10:23:27 +05:30
parent 9f82e90a66
commit ae0b63d97d
2 changed files with 55 additions and 1 deletions
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2
arch/arc/include/asm/cache.h
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@ -96,6 +96,8 @@ extern unsigned long perip_base, perip_end;
#define ARC_REG_SLC_CTRL 0x903
#define ARC_REG_SLC_FLUSH 0x904
#define ARC_REG_SLC_INVALIDATE 0x905
#define ARC_AUX_SLC_IVDL 0x910
#define ARC_AUX_SLC_FLDL 0x912
#define ARC_REG_SLC_RGN_START 0x914
#define ARC_REG_SLC_RGN_START1 0x915
#define ARC_REG_SLC_RGN_END 0x916

54
arch/arc/mm/cache.c
View File

@ -652,7 +652,7 @@ static void __ic_line_inv_vaddr(phys_addr_t paddr, unsigned long vaddr,
#endif /* CONFIG_ARC_HAS_ICACHE */
noinline void slc_op(phys_addr_t paddr, unsigned long sz, const int op)
noinline void slc_op_rgn(phys_addr_t paddr, unsigned long sz, const int op)
{
#ifdef CONFIG_ISA_ARCV2
/*
@ -715,6 +715,58 @@ noinline void slc_op(phys_addr_t paddr, unsigned long sz, const int op)
#endif
}
noinline void slc_op_line(phys_addr_t paddr, unsigned long sz, const int op)
{
#ifdef CONFIG_ISA_ARCV2
/*
* SLC is shared between all cores and concurrent aux operations from
* multiple cores need to be serialized using a spinlock
* A concurrent operation can be silently ignored and/or the old/new
* operation can remain incomplete forever (lockup in SLC_CTRL_BUSY loop
* below)
*/
static DEFINE_SPINLOCK(lock);
const unsigned long SLC_LINE_MASK = ~(l2_line_sz - 1);
unsigned int ctrl, cmd;
unsigned long flags;
int num_lines;
spin_lock_irqsave(&lock, flags);
ctrl = read_aux_reg(ARC_REG_SLC_CTRL);
/* Don't rely on default value of IM bit */
if (!(op & OP_FLUSH)) /* i.e. OP_INV */
ctrl &= ~SLC_CTRL_IM; /* clear IM: Disable flush before Inv */
else
ctrl |= SLC_CTRL_IM;
write_aux_reg(ARC_REG_SLC_CTRL, ctrl);
cmd = op & OP_INV ? ARC_AUX_SLC_IVDL : ARC_AUX_SLC_FLDL;
sz += paddr & ~SLC_LINE_MASK;
paddr &= SLC_LINE_MASK;
num_lines = DIV_ROUND_UP(sz, l2_line_sz);
while (num_lines-- > 0) {
write_aux_reg(cmd, paddr);
paddr += l2_line_sz;
}
/* Make sure "busy" bit reports correct stataus, see STAR 9001165532 */
read_aux_reg(ARC_REG_SLC_CTRL);
while (read_aux_reg(ARC_REG_SLC_CTRL) & SLC_CTRL_BUSY);
spin_unlock_irqrestore(&lock, flags);
#endif
}
#define slc_op(paddr, sz, op) slc_op_rgn(paddr, sz, op)
noinline static void slc_entire_op(const int op)
{
unsigned int ctrl, r = ARC_REG_SLC_CTRL;