The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x c7d0b2db5bc5e8c0fdc67b3c8f463c3dfec92f77 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024073024-passable-cardigan-cd15@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

c7d0b2db5bc5 ("bus: mhi: ep: Do not allocate memory for MHI objects from DMA zone") 2547beb00ddb ("bus: mhi: ep: Add support for async DMA read operation") ee08acb58fe4 ("bus: mhi: ep: Add support for async DMA write operation") 8b786ed8fb08 ("bus: mhi: ep: Introduce async read/write callbacks") 927105244f8b ("bus: mhi: ep: Rename read_from_host() and write_to_host() APIs") b08ded2ef2e9 ("bus: mhi: ep: Pass mhi_ep_buf_info struct to read/write APIs") 62210a26cd4f ("bus: mhi: ep: Use slab allocator where applicable") 987fdb5a43a6 ("bus: mhi: ep: Do not allocate event ring element on stack")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From c7d0b2db5bc5e8c0fdc67b3c8f463c3dfec92f77 Mon Sep 17 00:00:00 2001 From: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org Date: Mon, 3 Jun 2024 22:13:54 +0530 Subject: [PATCH] bus: mhi: ep: Do not allocate memory for MHI objects from DMA zone

MHI endpoint stack accidentally started allocating memory for objects from DMA zone since commit 62210a26cd4f ("bus: mhi: ep: Use slab allocator where applicable"). But there is no real need to allocate memory from this naturally limited DMA zone. This also causes the MHI endpoint stack to run out of memory while doing high bandwidth transfers.

So let's switch over to normal memory.

Cc: stable@vger.kernel.org # 6.8 Fixes: 62210a26cd4f ("bus: mhi: ep: Use slab allocator where applicable") Reviewed-by: Mayank Rana quic_mrana@quicinc.com Link: https://lore.kernel.org/r/20240603164354.79035-1-manivannan.sadhasivam@linar... Signed-off-by: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org

diff --git a/drivers/bus/mhi/ep/main.c b/drivers/bus/mhi/ep/main.c index f8f674adf1d4..4acfac73ca9a 100644 --- a/drivers/bus/mhi/ep/main.c +++ b/drivers/bus/mhi/ep/main.c @@ -90,7 +90,7 @@ static int mhi_ep_send_completion_event(struct mhi_ep_cntrl *mhi_cntrl, struct m struct mhi_ring_element *event; int ret;

- event = kmem_cache_zalloc(mhi_cntrl->ev_ring_el_cache, GFP_KERNEL | GFP_DMA); + event = kmem_cache_zalloc(mhi_cntrl->ev_ring_el_cache, GFP_KERNEL); if (!event) return -ENOMEM;

@@ -109,7 +109,7 @@ int mhi_ep_send_state_change_event(struct mhi_ep_cntrl *mhi_cntrl, enum mhi_stat struct mhi_ring_element *event; int ret;

- event = kmem_cache_zalloc(mhi_cntrl->ev_ring_el_cache, GFP_KERNEL | GFP_DMA); + event = kmem_cache_zalloc(mhi_cntrl->ev_ring_el_cache, GFP_KERNEL); if (!event) return -ENOMEM;

@@ -127,7 +127,7 @@ int mhi_ep_send_ee_event(struct mhi_ep_cntrl *mhi_cntrl, enum mhi_ee_type exec_e struct mhi_ring_element *event; int ret;

- event = kmem_cache_zalloc(mhi_cntrl->ev_ring_el_cache, GFP_KERNEL | GFP_DMA); + event = kmem_cache_zalloc(mhi_cntrl->ev_ring_el_cache, GFP_KERNEL); if (!event) return -ENOMEM;

@@ -146,7 +146,7 @@ static int mhi_ep_send_cmd_comp_event(struct mhi_ep_cntrl *mhi_cntrl, enum mhi_e struct mhi_ring_element *event; int ret;

- event = kmem_cache_zalloc(mhi_cntrl->ev_ring_el_cache, GFP_KERNEL | GFP_DMA); + event = kmem_cache_zalloc(mhi_cntrl->ev_ring_el_cache, GFP_KERNEL); if (!event) return -ENOMEM;

@@ -438,7 +438,7 @@ static int mhi_ep_read_channel(struct mhi_ep_cntrl *mhi_cntrl, read_offset = mhi_chan->tre_size - mhi_chan->tre_bytes_left; write_offset = len - buf_left;

- buf_addr = kmem_cache_zalloc(mhi_cntrl->tre_buf_cache, GFP_KERNEL | GFP_DMA); + buf_addr = kmem_cache_zalloc(mhi_cntrl->tre_buf_cache, GFP_KERNEL); if (!buf_addr) return -ENOMEM;

@@ -1481,14 +1481,14 @@ int mhi_ep_register_controller(struct mhi_ep_cntrl *mhi_cntrl,

mhi_cntrl->ev_ring_el_cache = kmem_cache_create("mhi_ep_event_ring_el", sizeof(struct mhi_ring_element), 0, - SLAB_CACHE_DMA, NULL); + 0, NULL); if (!mhi_cntrl->ev_ring_el_cache) { ret = -ENOMEM; goto err_free_cmd; }

mhi_cntrl->tre_buf_cache = kmem_cache_create("mhi_ep_tre_buf", MHI_EP_DEFAULT_MTU, 0, - SLAB_CACHE_DMA, NULL); + 0, NULL); if (!mhi_cntrl->tre_buf_cache) { ret = -ENOMEM; goto err_destroy_ev_ring_el_cache;