From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AB164309EF3 for ; Wed, 17 Sep 2025 14:11:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758118265; cv=none; b=kx5/0XvtBoWIYD/a6lBcG7AFh6bzu/f4+fGTejsiLCFchK0iVw4efNloM0TBGgvOc+NSLG4cJoPug0i20I75/Ob65eunejDI744yGt0ilBGk9QFDYyVfpq46DN/Xsll0+vg/VZ3fVAgC8Y2VQ8HsEb9jU2NdPu81AKIWWEzCO+g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758118265; c=relaxed/simple; bh=hA9ISsPcvqt+B9HUqNQxdYjmLO6EIqjHtLTKGX4xsTY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=k+vAGlNGkuWUPpSw1/nuLswXkTeIYSlGwMGOCu1agJQ1KdELDE1+PshJ7h2bW3/N6bove7l/xBqpPPWG/uLbJ7wQ4LVcR62TSaUZ0J881IiT5MnHHRyK7FDt++Wwcmz0EtADtN9HtFTvExNz3lEuj7apGI+R2KD5KXe02s1Tl9Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=M5a5ZXyI; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="M5a5ZXyI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F0069C4CEE7; Wed, 17 Sep 2025 14:11:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1758118264; bh=hA9ISsPcvqt+B9HUqNQxdYjmLO6EIqjHtLTKGX4xsTY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=M5a5ZXyIdcNlPp8xdgER8pjWWeaiSMyraRz22iDrr9fn9S6WLWYPZbDH5dxcn/V1K V5eMWC8jPlGrLp6mPOcEppNMc0hPTAGt/cINAecsL3XKtAWTakbeZd6S8reWQBbyLd liM303+oRbj/UoQsP47nGBCsHuwS+96LtBJN0ho3bxar+aF9zgWfX7rc6HhOV9Q8uz tOSNegeZTbGrpHciYLgU5I0PEbPtx8sTklD+TkiYVwbsDDd2bsZjWpL7FfF/Q4CzJO emwUFPreIPZr8PiQwFbcs30h1e9PN+btOU8ODvZ2KIsdk2TNBhZmraWRETJ3P2doHv qRU804lV1etxg== From: Sasha Levin To: stable@vger.kernel.org Cc: Mathias Nyman , Greg Kroah-Hartman , Sasha Levin Subject: [PATCH 5.10.y 1/2] xhci: dbc: decouple endpoint allocation from initialization Date: Wed, 17 Sep 2025 10:11:00 -0400 Message-ID: <20250917141101.578289-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <2025091731-subtotal-outcome-6092@gregkh> References: <2025091731-subtotal-outcome-6092@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Mathias Nyman [ Upstream commit 220a0ffde02f962c13bc752b01aa570b8c65a37b ] Decouple allocation of endpoint ring buffer from initialization of the buffer, and initialization of endpoint context parts from from the rest of the contexts. It allows driver to clear up and reinitialize endpoint rings after disconnect without reallocating everything. This is a prerequisite for the next patch that prevents the transfer ring from filling up with cancelled (no-op) TRBs if a debug cable is reconnected several times without transferring anything. Cc: stable@vger.kernel.org Fixes: dfba2174dc42 ("usb: xhci: Add DbC support in xHCI driver") Signed-off-by: Mathias Nyman Link: https://lore.kernel.org/r/20250902105306.877476-2-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/host/xhci-dbgcap.c | 71 ++++++++++++++++++++++------------ 1 file changed, 46 insertions(+), 25 deletions(-) diff --git a/drivers/usb/host/xhci-dbgcap.c b/drivers/usb/host/xhci-dbgcap.c index 03f047f5508bf..43106b5840b2d 100644 --- a/drivers/usb/host/xhci-dbgcap.c +++ b/drivers/usb/host/xhci-dbgcap.c @@ -86,13 +86,34 @@ static u32 xhci_dbc_populate_strings(struct dbc_str_descs *strings) return string_length; } +static void xhci_dbc_init_ep_contexts(struct xhci_dbc *dbc) +{ + struct xhci_ep_ctx *ep_ctx; + unsigned int max_burst; + dma_addr_t deq; + + max_burst = DBC_CTRL_MAXBURST(readl(&dbc->regs->control)); + + /* Populate bulk out endpoint context: */ + ep_ctx = dbc_bulkout_ctx(dbc); + deq = dbc_bulkout_enq(dbc); + ep_ctx->ep_info = 0; + ep_ctx->ep_info2 = dbc_epctx_info2(BULK_OUT_EP, 1024, max_burst); + ep_ctx->deq = cpu_to_le64(deq | dbc->ring_out->cycle_state); + + /* Populate bulk in endpoint context: */ + ep_ctx = dbc_bulkin_ctx(dbc); + deq = dbc_bulkin_enq(dbc); + ep_ctx->ep_info = 0; + ep_ctx->ep_info2 = dbc_epctx_info2(BULK_IN_EP, 1024, max_burst); + ep_ctx->deq = cpu_to_le64(deq | dbc->ring_in->cycle_state); +} + static void xhci_dbc_init_contexts(struct xhci_dbc *dbc, u32 string_length) { struct dbc_info_context *info; - struct xhci_ep_ctx *ep_ctx; u32 dev_info; - dma_addr_t deq, dma; - unsigned int max_burst; + dma_addr_t dma; if (!dbc) return; @@ -106,20 +127,8 @@ static void xhci_dbc_init_contexts(struct xhci_dbc *dbc, u32 string_length) info->serial = cpu_to_le64(dma + DBC_MAX_STRING_LENGTH * 3); info->length = cpu_to_le32(string_length); - /* Populate bulk out endpoint context: */ - ep_ctx = dbc_bulkout_ctx(dbc); - max_burst = DBC_CTRL_MAXBURST(readl(&dbc->regs->control)); - deq = dbc_bulkout_enq(dbc); - ep_ctx->ep_info = 0; - ep_ctx->ep_info2 = dbc_epctx_info2(BULK_OUT_EP, 1024, max_burst); - ep_ctx->deq = cpu_to_le64(deq | dbc->ring_out->cycle_state); - - /* Populate bulk in endpoint context: */ - ep_ctx = dbc_bulkin_ctx(dbc); - deq = dbc_bulkin_enq(dbc); - ep_ctx->ep_info = 0; - ep_ctx->ep_info2 = dbc_epctx_info2(BULK_IN_EP, 1024, max_burst); - ep_ctx->deq = cpu_to_le64(deq | dbc->ring_in->cycle_state); + /* Populate bulk in and out endpoint contexts: */ + xhci_dbc_init_ep_contexts(dbc); /* Set DbC context and info registers: */ lo_hi_writeq(dbc->ctx->dma, &dbc->regs->dccp); @@ -421,6 +430,23 @@ dbc_alloc_ctx(struct device *dev, gfp_t flags) return ctx; } +static void xhci_dbc_ring_init(struct xhci_ring *ring) +{ + struct xhci_segment *seg = ring->first_seg; + + /* clear all trbs on ring in case of old ring */ + memset(seg->trbs, 0, TRB_SEGMENT_SIZE); + + /* Only event ring does not use link TRB */ + if (ring->type != TYPE_EVENT) { + union xhci_trb *trb = &seg->trbs[TRBS_PER_SEGMENT - 1]; + + trb->link.segment_ptr = cpu_to_le64(ring->first_seg->dma); + trb->link.control = cpu_to_le32(LINK_TOGGLE | TRB_TYPE(TRB_LINK)); + } + xhci_initialize_ring_info(ring, 1); +} + static struct xhci_ring * xhci_dbc_ring_alloc(struct device *dev, enum xhci_ring_type type, gfp_t flags) { @@ -449,15 +475,10 @@ xhci_dbc_ring_alloc(struct device *dev, enum xhci_ring_type type, gfp_t flags) seg->dma = dma; - /* Only event ring does not use link TRB */ - if (type != TYPE_EVENT) { - union xhci_trb *trb = &seg->trbs[TRBS_PER_SEGMENT - 1]; - - trb->link.segment_ptr = cpu_to_le64(dma); - trb->link.control = cpu_to_le32(LINK_TOGGLE | TRB_TYPE(TRB_LINK)); - } INIT_LIST_HEAD(&ring->td_list); - xhci_initialize_ring_info(ring, 1); + + xhci_dbc_ring_init(ring); + return ring; dma_fail: kfree(seg); -- 2.51.0