linux-kernel - [PATCH 1/2] dmaengine: ioat: fixing chunk sizing macros dependency

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Date:   Thu,  2 Apr 2020 12:27:17 +0300
From:   leonid.ravich@...l.com
To:     dmaengine@...r.kernel.org
Cc:     lravich@...il.com, Leonid Ravich <Leonid.Ravich@...l.com>,
        Vinod Koul <vkoul@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexios Zavras <alexios.zavras@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        "Alexander.Barabash@...l.com" <Alexander.Barabash@...l.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Jilayne Lovejoy <opensource@...ayne.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] dmaengine: ioat: fixing chunk sizing macros dependency

From: Leonid Ravich <Leonid.Ravich@....com>

prepare for changing alloc size.

Signed-off-by: Leonid Ravich <Leonid.Ravich@....com>
---
 drivers/dma/ioat/dma.c  | 14 ++++++++------
 drivers/dma/ioat/dma.h  | 10 ++++++----
 drivers/dma/ioat/init.c |  2 +-
 3 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index 18c011e..1e0e6c1 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -332,8 +332,8 @@ static dma_cookie_t ioat_tx_submit_unlock(struct dma_async_tx_descriptor *tx)
 	u8 *pos;
 	off_t offs;
 
-	chunk = idx / IOAT_DESCS_PER_2M;
-	idx &= (IOAT_DESCS_PER_2M - 1);
+	chunk = idx / IOAT_DESCS_PER_CHUNK;
+	idx &= (IOAT_DESCS_PER_CHUNK - 1);
 	offs = idx * IOAT_DESC_SZ;
 	pos = (u8 *)ioat_chan->descs[chunk].virt + offs;
 	phys = ioat_chan->descs[chunk].hw + offs;
@@ -370,7 +370,8 @@ struct ioat_ring_ent **
 	if (!ring)
 		return NULL;
 
-	ioat_chan->desc_chunks = chunks = (total_descs * IOAT_DESC_SZ) / SZ_2M;
+	chunks = (total_descs * IOAT_DESC_SZ) / IOAT_CHUNK_SIZE;
+	ioat_chan->desc_chunks = chunks;
 
 	for (i = 0; i < chunks; i++) {
 		struct ioat_descs *descs = &ioat_chan->descs[i];
@@ -382,8 +383,9 @@ struct ioat_ring_ent **
 
 			for (idx = 0; idx < i; idx++) {
 				descs = &ioat_chan->descs[idx];
-				dma_free_coherent(to_dev(ioat_chan), SZ_2M,
-						  descs->virt, descs->hw);
+				dma_free_coherent(to_dev(ioat_chan),
+						IOAT_CHUNK_SIZE,
+						descs->virt, descs->hw);
 				descs->virt = NULL;
 				descs->hw = 0;
 			}
@@ -404,7 +406,7 @@ struct ioat_ring_ent **
 
 			for (idx = 0; idx < ioat_chan->desc_chunks; idx++) {
 				dma_free_coherent(to_dev(ioat_chan),
-						  SZ_2M,
+						  IOAT_CHUNK_SIZE,
 						  ioat_chan->descs[idx].virt,
 						  ioat_chan->descs[idx].hw);
 				ioat_chan->descs[idx].virt = NULL;
diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
index b8e8e0b..535aba9 100644
--- a/drivers/dma/ioat/dma.h
+++ b/drivers/dma/ioat/dma.h
@@ -81,6 +81,11 @@ struct ioatdma_device {
 	u32 msixpba;
 };
 
+#define IOAT_MAX_ORDER 16
+#define IOAT_MAX_DESCS (1 << IOAT_MAX_ORDER)
+#define IOAT_CHUNK_SIZE (SZ_2M)
+#define IOAT_DESCS_PER_CHUNK (IOAT_CHUNK_SIZE/IOAT_DESC_SZ)
+
 struct ioat_descs {
 	void *virt;
 	dma_addr_t hw;
@@ -128,7 +133,7 @@ struct ioatdma_chan {
 	u16 produce;
 	struct ioat_ring_ent **ring;
 	spinlock_t prep_lock;
-	struct ioat_descs descs[2];
+	struct ioat_descs descs[IOAT_MAX_DESCS/IOAT_DESCS_PER_CHUNK];
 	int desc_chunks;
 	int intr_coalesce;
 	int prev_intr_coalesce;
@@ -301,9 +306,6 @@ static inline bool is_ioat_bug(unsigned long err)
 	return !!err;
 }
 
-#define IOAT_MAX_ORDER 16
-#define IOAT_MAX_DESCS 65536
-#define IOAT_DESCS_PER_2M 32768
 
 static inline u32 ioat_ring_size(struct ioatdma_chan *ioat_chan)
 {
diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c
index 60e9afb..58d1356 100644
--- a/drivers/dma/ioat/init.c
+++ b/drivers/dma/ioat/init.c
@@ -651,7 +651,7 @@ static void ioat_free_chan_resources(struct dma_chan *c)
 	}
 
 	for (i = 0; i < ioat_chan->desc_chunks; i++) {
-		dma_free_coherent(to_dev(ioat_chan), SZ_2M,
+		dma_free_coherent(to_dev(ioat_chan), IOAT_CHUNK_SIZE,
 				  ioat_chan->descs[i].virt,
 				  ioat_chan->descs[i].hw);
 		ioat_chan->descs[i].virt = NULL;
-- 
1.9.3