diff options
author | Hemant Kumar <hemantk@codeaurora.org> | 2020-05-21 22:32:36 +0530 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-22 09:35:40 +0200 |
commit | cd116318803f5ee222301f3525578241a04822ee (patch) | |
tree | cb3c4c0cfa8e2d3bdce89e9f54975aacebdfe178 | |
parent | ddc0aef01a90ee8431f1a47f7b35e84d36ab8913 (diff) | |
download | linux-cd116318803f5ee222301f3525578241a04822ee.tar.bz2 |
bus: mhi: core: Refactor mhi queue APIs
Move all the common code to generate TRE from mhi_queue_buf,
mhi_queue_dma and mhi_queue_skb to mhi_gen_tre. This helps
to centralize the TRE generation code which makes any future
bug fixing easier to manage in these APIs.
Suggested-by: Jeffrey Hugo <jhugo@codeaurora.org>
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20200521170249.21795-2-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | drivers/bus/mhi/core/internal.h | 3 | ||||
-rw-r--r-- | drivers/bus/mhi/core/main.c | 107 |
2 files changed, 47 insertions, 63 deletions
diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h index 095d95bc0e37..40c47f918ca3 100644 --- a/drivers/bus/mhi/core/internal.h +++ b/drivers/bus/mhi/core/internal.h @@ -670,8 +670,7 @@ irqreturn_t mhi_intvec_threaded_handler(int irq_number, void *dev); irqreturn_t mhi_intvec_handler(int irq_number, void *dev); int mhi_gen_tre(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan, - void *buf, void *cb, size_t buf_len, enum mhi_flags flags); - + struct mhi_buf_info *info, enum mhi_flags flags); int mhi_map_single_no_bb(struct mhi_controller *mhi_cntrl, struct mhi_buf_info *buf_info); int mhi_map_single_use_bb(struct mhi_controller *mhi_cntrl, diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index c26eed06e5cc..605640c3094e 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -919,9 +919,7 @@ int mhi_queue_skb(struct mhi_device *mhi_dev, enum dma_data_direction dir, struct mhi_chan *mhi_chan = (dir == DMA_TO_DEVICE) ? mhi_dev->ul_chan : mhi_dev->dl_chan; struct mhi_ring *tre_ring = &mhi_chan->tre_ring; - struct mhi_ring *buf_ring = &mhi_chan->buf_ring; - struct mhi_buf_info *buf_info; - struct mhi_tre *mhi_tre; + struct mhi_buf_info buf_info = { }; int ret; /* If MHI host pre-allocates buffers then client drivers cannot queue */ @@ -946,27 +944,15 @@ int mhi_queue_skb(struct mhi_device *mhi_dev, enum dma_data_direction dir, /* Toggle wake to exit out of M2 */ mhi_cntrl->wake_toggle(mhi_cntrl); - /* Generate the TRE */ - buf_info = buf_ring->wp; - - buf_info->v_addr = skb->data; - buf_info->cb_buf = skb; - buf_info->wp = tre_ring->wp; - buf_info->dir = mhi_chan->dir; - buf_info->len = len; - ret = mhi_cntrl->map_single(mhi_cntrl, buf_info); - if (ret) - goto map_error; - - mhi_tre = tre_ring->wp; - - mhi_tre->ptr = MHI_TRE_DATA_PTR(buf_info->p_addr); - mhi_tre->dword[0] = MHI_TRE_DATA_DWORD0(buf_info->len); - mhi_tre->dword[1] = MHI_TRE_DATA_DWORD1(1, 1, 0, 0); + buf_info.v_addr = skb->data; + buf_info.cb_buf = skb; + buf_info.len = len; - /* increment WP */ - mhi_add_ring_element(mhi_cntrl, tre_ring); - mhi_add_ring_element(mhi_cntrl, buf_ring); + ret = mhi_gen_tre(mhi_cntrl, mhi_chan, &buf_info, mflags); + if (unlikely(ret)) { + read_unlock_bh(&mhi_cntrl->pm_lock); + return ret; + } if (mhi_chan->dir == DMA_TO_DEVICE) atomic_inc(&mhi_cntrl->pending_pkts); @@ -980,11 +966,6 @@ int mhi_queue_skb(struct mhi_device *mhi_dev, enum dma_data_direction dir, read_unlock_bh(&mhi_cntrl->pm_lock); return 0; - -map_error: - read_unlock_bh(&mhi_cntrl->pm_lock); - - return ret; } EXPORT_SYMBOL_GPL(mhi_queue_skb); @@ -996,9 +977,8 @@ int mhi_queue_dma(struct mhi_device *mhi_dev, enum dma_data_direction dir, mhi_dev->dl_chan; struct device *dev = &mhi_cntrl->mhi_dev->dev; struct mhi_ring *tre_ring = &mhi_chan->tre_ring; - struct mhi_ring *buf_ring = &mhi_chan->buf_ring; - struct mhi_buf_info *buf_info; - struct mhi_tre *mhi_tre; + struct mhi_buf_info buf_info = { }; + int ret; /* If MHI host pre-allocates buffers then client drivers cannot queue */ if (mhi_chan->pre_alloc) @@ -1025,25 +1005,16 @@ int mhi_queue_dma(struct mhi_device *mhi_dev, enum dma_data_direction dir, /* Toggle wake to exit out of M2 */ mhi_cntrl->wake_toggle(mhi_cntrl); - /* Generate the TRE */ - buf_info = buf_ring->wp; - WARN_ON(buf_info->used); - buf_info->p_addr = mhi_buf->dma_addr; - buf_info->pre_mapped = true; - buf_info->cb_buf = mhi_buf; - buf_info->wp = tre_ring->wp; - buf_info->dir = mhi_chan->dir; - buf_info->len = len; - - mhi_tre = tre_ring->wp; - - mhi_tre->ptr = MHI_TRE_DATA_PTR(buf_info->p_addr); - mhi_tre->dword[0] = MHI_TRE_DATA_DWORD0(buf_info->len); - mhi_tre->dword[1] = MHI_TRE_DATA_DWORD1(1, 1, 0, 0); + buf_info.p_addr = mhi_buf->dma_addr; + buf_info.cb_buf = mhi_buf; + buf_info.pre_mapped = true; + buf_info.len = len; - /* increment WP */ - mhi_add_ring_element(mhi_cntrl, tre_ring); - mhi_add_ring_element(mhi_cntrl, buf_ring); + ret = mhi_gen_tre(mhi_cntrl, mhi_chan, &buf_info, mflags); + if (unlikely(ret)) { + read_unlock_bh(&mhi_cntrl->pm_lock); + return ret; + } if (mhi_chan->dir == DMA_TO_DEVICE) atomic_inc(&mhi_cntrl->pending_pkts); @@ -1061,7 +1032,7 @@ int mhi_queue_dma(struct mhi_device *mhi_dev, enum dma_data_direction dir, EXPORT_SYMBOL_GPL(mhi_queue_dma); int mhi_gen_tre(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan, - void *buf, void *cb, size_t buf_len, enum mhi_flags flags) + struct mhi_buf_info *info, enum mhi_flags flags) { struct mhi_ring *buf_ring, *tre_ring; struct mhi_tre *mhi_tre; @@ -1073,15 +1044,22 @@ int mhi_gen_tre(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan, tre_ring = &mhi_chan->tre_ring; buf_info = buf_ring->wp; - buf_info->v_addr = buf; - buf_info->cb_buf = cb; + WARN_ON(buf_info->used); + buf_info->pre_mapped = info->pre_mapped; + if (info->pre_mapped) + buf_info->p_addr = info->p_addr; + else + buf_info->v_addr = info->v_addr; + buf_info->cb_buf = info->cb_buf; buf_info->wp = tre_ring->wp; buf_info->dir = mhi_chan->dir; - buf_info->len = buf_len; + buf_info->len = info->len; - ret = mhi_cntrl->map_single(mhi_cntrl, buf_info); - if (ret) - return ret; + if (!info->pre_mapped) { + ret = mhi_cntrl->map_single(mhi_cntrl, buf_info); + if (ret) + return ret; + } eob = !!(flags & MHI_EOB); eot = !!(flags & MHI_EOT); @@ -1090,7 +1068,7 @@ int mhi_gen_tre(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan, mhi_tre = tre_ring->wp; mhi_tre->ptr = MHI_TRE_DATA_PTR(buf_info->p_addr); - mhi_tre->dword[0] = MHI_TRE_DATA_DWORD0(buf_len); + mhi_tre->dword[0] = MHI_TRE_DATA_DWORD0(info->len); mhi_tre->dword[1] = MHI_TRE_DATA_DWORD1(bei, eot, eob, chain); /* increment WP */ @@ -1107,6 +1085,7 @@ int mhi_queue_buf(struct mhi_device *mhi_dev, enum dma_data_direction dir, struct mhi_chan *mhi_chan = (dir == DMA_TO_DEVICE) ? mhi_dev->ul_chan : mhi_dev->dl_chan; struct mhi_ring *tre_ring; + struct mhi_buf_info buf_info = { }; unsigned long flags; int ret; @@ -1122,7 +1101,11 @@ int mhi_queue_buf(struct mhi_device *mhi_dev, enum dma_data_direction dir, if (mhi_is_ring_full(mhi_cntrl, tre_ring)) return -ENOMEM; - ret = mhi_gen_tre(mhi_cntrl, mhi_chan, buf, buf, len, mflags); + buf_info.v_addr = buf; + buf_info.cb_buf = buf; + buf_info.len = len; + + ret = mhi_gen_tre(mhi_cntrl, mhi_chan, &buf_info, mflags); if (unlikely(ret)) return ret; @@ -1323,7 +1306,7 @@ int mhi_prepare_channel(struct mhi_controller *mhi_cntrl, while (nr_el--) { void *buf; - + struct mhi_buf_info info = { }; buf = kmalloc(len, GFP_KERNEL); if (!buf) { ret = -ENOMEM; @@ -1331,8 +1314,10 @@ int mhi_prepare_channel(struct mhi_controller *mhi_cntrl, } /* Prepare transfer descriptors */ - ret = mhi_gen_tre(mhi_cntrl, mhi_chan, buf, buf, - len, MHI_EOT); + info.v_addr = buf; + info.cb_buf = buf; + info.len = len; + ret = mhi_gen_tre(mhi_cntrl, mhi_chan, &info, MHI_EOT); if (ret) { kfree(buf); goto error_pre_alloc; |