samsung-sm8650/android_kernel_samsung_sm8650-modules
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disp: msm: sde: avoid using spinlock for register log

Telusuri Sumber 
Add support to use atomic variable instead of spinlock
for register logs during register write. This change
helps in reducing the run-time and is safe to use as
most of the register writes happen in commit context.

Change-Id: Ib7e377f80cbf437e391792b0b424cbd1eefdf497
Signed-off-by: Yashwanth <yvulapu@codeaurora.org>
Signed-off-by: Samantha Tran <samtran@codeaurora.org>
This commit is contained in:
Yashwanth
2021-02-25 14:51:36 +05:30
committed by Samantha Tran
orang tua 8b0b1d1c51
melakukan e57b8443cc
2 mengubah file dengan 5 tambahan dan 11 penghapusan
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3
msm/sde_dbg.h
Melihat File

@@ -191,11 +191,10 @@ struct sde_dbg_reglog {
u32 first; u32 first;
u32 last; u32 last;
u32 last_dump; u32 last_dump;
u32 curr; atomic64_t curr;
u32 next; u32 next;
u32 enable; u32 enable;
u32 enable_mask; u32 enable_mask;
spinlock_t spin_lock;
}; };
extern struct sde_dbg_reglog *sde_dbg_base_reglog; extern struct sde_dbg_reglog *sde_dbg_base_reglog;

13
msm/sde_dbg_evtlog.c
Melihat File

@@ -103,27 +103,22 @@ exit:
void sde_reglog_log(u8 blk_id, u32 val, u32 addr) void sde_reglog_log(u8 blk_id, u32 val, u32 addr)
{ {
unsigned long flags;
struct sde_dbg_reglog_log *log; struct sde_dbg_reglog_log *log;
struct sde_dbg_reglog *reglog = sde_dbg_base_reglog; struct sde_dbg_reglog *reglog = sde_dbg_base_reglog;
int index;
if (!reglog) if (!reglog)
return; return;
spin_lock_irqsave(&reglog->spin_lock, flags); index = abs(atomic64_inc_return(&reglog->curr) % SDE_REGLOG_ENTRY);
log = &reglog->logs[reglog->curr];
log = &reglog->logs[index];
log->blk_id = blk_id; log->blk_id = blk_id;
log->val = val; log->val = val;
log->addr = addr; log->addr = addr;
log->time = local_clock(); log->time = local_clock();
log->pid = current->pid; log->pid = current->pid;
reglog->curr = (reglog->curr + 1) % SDE_REGLOG_ENTRY;
reglog->last++; reglog->last++;
spin_unlock_irqrestore(&reglog->spin_lock, flags);
} }
/* always dump the last entries which are not dumped yet */ /* always dump the last entries which are not dumped yet */
@@ -245,7 +240,7 @@ struct sde_dbg_reglog *sde_reglog_init(void)
if (!reglog) if (!reglog)
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);
spin_lock_init(&reglog->spin_lock); atomic64_set(&reglog->curr, 0);
return reglog; return reglog;
} }