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Message-ID: <20240620175703.605111-19-yury.norov@gmail.com>
Date: Thu, 20 Jun 2024 10:56:41 -0700
From: Yury Norov <yury.norov@...il.com>
To: linux-kernel@...r.kernel.org,
Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Colin Ian King <colin.i.king@...il.com>,
linuxppc-dev@...ts.ozlabs.org
Cc: Yury Norov <yury.norov@...il.com>,
Alexey Klimov <alexey.klimov@...aro.org>,
Bart Van Assche <bvanassche@....org>,
Jan Kara <jack@...e.cz>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Matthew Wilcox <willy@...radead.org>,
Mirsad Todorovac <mirsad.todorovac@....unizg.hr>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Sergey Shtylyov <s.shtylyov@....ru>
Subject: [PATCH v4 18/40] powerpc: optimize arch code by using atomic find_bit() API
Use find_and_{set,clear}_bit() where appropriate and simplify the logic.
Signed-off-by: Yury Norov <yury.norov@...il.com>
---
arch/powerpc/mm/book3s32/mmu_context.c | 11 +++---
arch/powerpc/platforms/pasemi/dma_lib.c | 46 ++++++----------------
arch/powerpc/platforms/powernv/pci-sriov.c | 13 ++----
3 files changed, 20 insertions(+), 50 deletions(-)
diff --git a/arch/powerpc/mm/book3s32/mmu_context.c b/arch/powerpc/mm/book3s32/mmu_context.c
index 1922f9a6b058..ece7b55b6cdb 100644
--- a/arch/powerpc/mm/book3s32/mmu_context.c
+++ b/arch/powerpc/mm/book3s32/mmu_context.c
@@ -17,6 +17,7 @@
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
*/
+#include <linux/find_atomic.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/export.h>
@@ -50,13 +51,11 @@ static unsigned long context_map[LAST_CONTEXT / BITS_PER_LONG + 1];
unsigned long __init_new_context(void)
{
- unsigned long ctx = next_mmu_context;
+ unsigned long ctx;
- while (test_and_set_bit(ctx, context_map)) {
- ctx = find_next_zero_bit(context_map, LAST_CONTEXT+1, ctx);
- if (ctx > LAST_CONTEXT)
- ctx = 0;
- }
+ ctx = find_and_set_next_bit(context_map, LAST_CONTEXT + 1, next_mmu_context);
+ if (ctx > LAST_CONTEXT)
+ ctx = 0;
next_mmu_context = (ctx + 1) & LAST_CONTEXT;
return ctx;
diff --git a/arch/powerpc/platforms/pasemi/dma_lib.c b/arch/powerpc/platforms/pasemi/dma_lib.c
index 1be1f18f6f09..db008902e5f3 100644
--- a/arch/powerpc/platforms/pasemi/dma_lib.c
+++ b/arch/powerpc/platforms/pasemi/dma_lib.c
@@ -5,6 +5,7 @@
* Common functions for DMA access on PA Semi PWRficient
*/
+#include <linux/find_atomic.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/pci.h>
@@ -118,14 +119,9 @@ static int pasemi_alloc_tx_chan(enum pasemi_dmachan_type type)
limit = MAX_TXCH;
break;
}
-retry:
- bit = find_next_bit(txch_free, MAX_TXCH, start);
- if (bit >= limit)
- return -ENOSPC;
- if (!test_and_clear_bit(bit, txch_free))
- goto retry;
-
- return bit;
+
+ bit = find_and_clear_next_bit(txch_free, MAX_TXCH, start);
+ return bit < limit ? bit : -ENOSPC;
}
static void pasemi_free_tx_chan(int chan)
@@ -136,15 +132,9 @@ static void pasemi_free_tx_chan(int chan)
static int pasemi_alloc_rx_chan(void)
{
- int bit;
-retry:
- bit = find_first_bit(rxch_free, MAX_RXCH);
- if (bit >= MAX_TXCH)
- return -ENOSPC;
- if (!test_and_clear_bit(bit, rxch_free))
- goto retry;
-
- return bit;
+ int bit = find_and_clear_bit(rxch_free, MAX_RXCH);
+
+ return bit < MAX_TXCH ? bit : -ENOSPC;
}
static void pasemi_free_rx_chan(int chan)
@@ -374,16 +364,9 @@ EXPORT_SYMBOL(pasemi_dma_free_buf);
*/
int pasemi_dma_alloc_flag(void)
{
- int bit;
+ int bit = find_and_clear_bit(flags_free, MAX_FLAGS);
-retry:
- bit = find_first_bit(flags_free, MAX_FLAGS);
- if (bit >= MAX_FLAGS)
- return -ENOSPC;
- if (!test_and_clear_bit(bit, flags_free))
- goto retry;
-
- return bit;
+ return bit < MAX_FLAGS ? bit : -ENOSPC;
}
EXPORT_SYMBOL(pasemi_dma_alloc_flag);
@@ -439,16 +422,9 @@ EXPORT_SYMBOL(pasemi_dma_clear_flag);
*/
int pasemi_dma_alloc_fun(void)
{
- int bit;
-
-retry:
- bit = find_first_bit(fun_free, MAX_FLAGS);
- if (bit >= MAX_FLAGS)
- return -ENOSPC;
- if (!test_and_clear_bit(bit, fun_free))
- goto retry;
+ int bit = find_and_clear_bit(fun_free, MAX_FLAGS);
- return bit;
+ return bit < MAX_FLAGS ? bit : -ENOSPC;
}
EXPORT_SYMBOL(pasemi_dma_alloc_fun);
diff --git a/arch/powerpc/platforms/powernv/pci-sriov.c b/arch/powerpc/platforms/powernv/pci-sriov.c
index cc7b1dd54ac6..e33e57c559f7 100644
--- a/arch/powerpc/platforms/powernv/pci-sriov.c
+++ b/arch/powerpc/platforms/powernv/pci-sriov.c
@@ -3,6 +3,7 @@
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/bitmap.h>
+#include <linux/find_atomic.h>
#include <linux/pci.h>
#include <asm/opal.h>
@@ -397,18 +398,12 @@ static int64_t pnv_ioda_map_m64_single(struct pnv_phb *phb,
static int pnv_pci_alloc_m64_bar(struct pnv_phb *phb, struct pnv_iov_data *iov)
{
- int win;
+ int win = find_and_set_bit(&phb->ioda.m64_bar_alloc, phb->ioda.m64_bar_idx + 1);
- do {
- win = find_next_zero_bit(&phb->ioda.m64_bar_alloc,
- phb->ioda.m64_bar_idx + 1, 0);
-
- if (win >= phb->ioda.m64_bar_idx + 1)
- return -1;
- } while (test_and_set_bit(win, &phb->ioda.m64_bar_alloc));
+ if (win >= phb->ioda.m64_bar_idx + 1)
+ return -1;
set_bit(win, iov->used_m64_bar_mask);
-
return win;
}
--
2.43.0
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