From 5346aafcefb5300921e3bc2d48e48f2103943d58 Mon Sep 17 00:00:00 2001 From: Anup Patel Date: Tue, 22 Aug 2017 15:26:57 +0530 Subject: [PATCH] dmaengine: bcm-sba-raid: Increase number of free sba_request Currently, we have only 1024 free sba_request created by sba_prealloc_channel_resources(). This is too low and the prep_xxx() callbacks start failing more often at time of RAID array setup over NVMe disks. This patch sets number of free sba_request created by sba_prealloc_channel_resources() to be: x 8192 Due to above, we will have sufficient number of free sba_request and prep_xxx() callbacks failing is very unlikely. Signed-off-by: Anup Patel Signed-off-by: Vinod Koul --- drivers/dma/bcm-sba-raid.c | 25 +++++++++++++------------ 1 file changed, 13 insertions(+), 12 deletions(-) diff --git a/drivers/dma/bcm-sba-raid.c b/drivers/dma/bcm-sba-raid.c index 9ab2d955ee14..4c68509576de 100644 --- a/drivers/dma/bcm-sba-raid.c +++ b/drivers/dma/bcm-sba-raid.c @@ -83,6 +83,8 @@ #define SBA_CMD_WRITE_BUFFER 0xc #define SBA_CMD_GALOIS 0xe +#define SBA_MAX_REQ_PER_MBOX_CHANNEL 8192 + /* Driver helper macros */ #define to_sba_request(tx) \ container_of(tx, struct sba_request, tx) @@ -1622,6 +1624,13 @@ static int sba_probe(struct platform_device *pdev) sba->dev = &pdev->dev; platform_set_drvdata(pdev, sba); + /* Number of channels equals number of mailbox channels */ + ret = of_count_phandle_with_args(pdev->dev.of_node, + "mboxes", "#mbox-cells"); + if (ret <= 0) + return -ENODEV; + mchans_count = ret; + /* Determine SBA version from DT compatible string */ if (of_device_is_compatible(sba->dev->of_node, "brcm,iproc-sba")) sba->ver = SBA_VER_1; @@ -1634,14 +1643,12 @@ static int sba_probe(struct platform_device *pdev) /* Derived Configuration parameters */ switch (sba->ver) { case SBA_VER_1: - sba->max_req = 1024; sba->hw_buf_size = 4096; sba->hw_resp_size = 8; sba->max_pq_coefs = 6; sba->max_pq_srcs = 6; break; case SBA_VER_2: - sba->max_req = 1024; sba->hw_buf_size = 4096; sba->hw_resp_size = 8; sba->max_pq_coefs = 30; @@ -1655,6 +1662,7 @@ static int sba_probe(struct platform_device *pdev) default: return -EINVAL; } + sba->max_req = SBA_MAX_REQ_PER_MBOX_CHANNEL * mchans_count; sba->max_cmd_per_req = sba->max_pq_srcs + 3; sba->max_xor_srcs = sba->max_cmd_per_req - 1; sba->max_resp_pool_size = sba->max_req * sba->hw_resp_size; @@ -1668,22 +1676,14 @@ static int sba_probe(struct platform_device *pdev) sba->client.knows_txdone = false; sba->client.tx_tout = 0; - /* Number of channels equals number of mailbox channels */ - ret = of_count_phandle_with_args(pdev->dev.of_node, - "mboxes", "#mbox-cells"); - if (ret <= 0) - return -ENODEV; - mchans_count = ret; - sba->mchans_count = 0; - atomic_set(&sba->mchans_current, 0); - /* Allocate mailbox channel array */ - sba->mchans = devm_kcalloc(&pdev->dev, sba->mchans_count, + sba->mchans = devm_kcalloc(&pdev->dev, mchans_count, sizeof(*sba->mchans), GFP_KERNEL); if (!sba->mchans) return -ENOMEM; /* Request mailbox channels */ + sba->mchans_count = 0; for (i = 0; i < mchans_count; i++) { sba->mchans[i] = mbox_request_channel(&sba->client, i); if (IS_ERR(sba->mchans[i])) { @@ -1692,6 +1692,7 @@ static int sba_probe(struct platform_device *pdev) } sba->mchans_count++; } + atomic_set(&sba->mchans_current, 0); /* Find-out underlying mailbox device */ ret = of_parse_phandle_with_args(pdev->dev.of_node, -- 2.45.2