/******************************************************************************* Specialised functions for managing Ring mode Copyright(C) 2011 STMicroelectronics Ltd It defines all the functions used to handle the normal/enhanced descriptors in case of the DMA is configured to work in chained or in ring mode. This program is free software; you can redistribute it and/or modify it under the terms and conditions of the GNU General Public License, version 2, as published by the Free Software Foundation. This program is distributed in the hope it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. The full GNU General Public License is included in this distribution in the file called "COPYING". Author: Giuseppe Cavallaro *******************************************************************************/ #include "stmmac.h" static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum) { struct stmmac_priv *priv = (struct stmmac_priv *)p; unsigned int entry = priv->cur_tx; struct dma_desc *desc; unsigned int nopaged_len = skb_headlen(skb); unsigned int bmax, len, des2; if (priv->extend_desc) desc = (struct dma_desc *)(priv->dma_etx + entry); else desc = priv->dma_tx + entry; if (priv->plat->enh_desc) bmax = BUF_SIZE_8KiB; else bmax = BUF_SIZE_2KiB; len = nopaged_len - bmax; if (nopaged_len > BUF_SIZE_8KiB) { des2 = dma_map_single(priv->device, skb->data, bmax, DMA_TO_DEVICE); desc->des2 = cpu_to_le32(des2); if (dma_mapping_error(priv->device, des2)) return -1; priv->tx_skbuff_dma[entry].buf = des2; priv->tx_skbuff_dma[entry].len = bmax; priv->tx_skbuff_dma[entry].is_jumbo = true; desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB); priv->hw->desc->prepare_tx_desc(desc, 1, bmax, csum, STMMAC_RING_MODE, 0, false); priv->tx_skbuff[entry] = NULL; entry = STMMAC_GET_ENTRY(entry, DMA_TX_SIZE); if (priv->extend_desc) desc = (struct dma_desc *)(priv->dma_etx + entry); else desc = priv->dma_tx + entry; des2 = dma_map_single(priv->device, skb->data + bmax, len, DMA_TO_DEVICE); desc->des2 = cpu_to_le32(des2); if (dma_mapping_error(priv->device, des2)) return -1; priv->tx_skbuff_dma[entry].buf = des2; priv->tx_skbuff_dma[entry].len = len; priv->tx_skbuff_dma[entry].is_jumbo = true; desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB); priv->hw->desc->prepare_tx_desc(desc, 0, len, csum, STMMAC_RING_MODE, 1, true); } else { des2 = dma_map_single(priv->device, skb->data, nopaged_len, DMA_TO_DEVICE); desc->des2 = cpu_to_le32(des2); if (dma_mapping_error(priv->device, des2)) return -1; priv->tx_skbuff_dma[entry].buf = des2; priv->tx_skbuff_dma[entry].len = nopaged_len; priv->tx_skbuff_dma[entry].is_jumbo = true; desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB); priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len, csum, STMMAC_RING_MODE, 0, true); } priv->cur_tx = entry; return entry; } static unsigned int stmmac_is_jumbo_frm(int len, int enh_desc) { unsigned int ret = 0; if (len >= BUF_SIZE_4KiB) ret = 1; return ret; } static void stmmac_refill_desc3(void *priv_ptr, struct dma_desc *p) { struct stmmac_priv *priv = (struct stmmac_priv *)priv_ptr; /* Fill DES3 in case of RING mode */ if (priv->dma_buf_sz >= BUF_SIZE_8KiB) p->des3 = cpu_to_le32(le32_to_cpu(p->des2) + BUF_SIZE_8KiB); } /* In ring mode we need to fill the desc3 because it is used as buffer */ static void stmmac_init_desc3(struct dma_desc *p) { p->des3 = cpu_to_le32(le32_to_cpu(p->des2) + BUF_SIZE_8KiB); } static void stmmac_clean_desc3(void *priv_ptr, struct dma_desc *p) { struct stmmac_priv *priv = (struct stmmac_priv *)priv_ptr; unsigned int entry = priv->dirty_tx; /* des3 is only used for jumbo frames tx or time stamping */ if (unlikely(priv->tx_skbuff_dma[entry].is_jumbo || (priv->tx_skbuff_dma[entry].last_segment && !priv->extend_desc && priv->hwts_tx_en))) p->des3 = 0; } static int stmmac_set_16kib_bfsize(int mtu) { int ret = 0; if (unlikely(mtu >= BUF_SIZE_8KiB)) ret = BUF_SIZE_16KiB; return ret; } const struct stmmac_mode_ops ring_mode_ops = { .is_jumbo_frm = stmmac_is_jumbo_frm, .jumbo_frm = stmmac_jumbo_frm, .refill_desc3 = stmmac_refill_desc3, .init_desc3 = stmmac_init_desc3, .clean_desc3 = stmmac_clean_desc3, .set_16kib_bfsize = stmmac_set_16kib_bfsize, }; committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-31 09:13:49 -0500 commit79c6f448c8b79c321e4a1f31f98194e4f6b6cae7 (patch) tree370efda701f03cccf21e02bb1fdd3b852547d75c /sound/hda parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
tracing: Fix hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'sound/hda')