From patchwork Mon Nov 27 12:45:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 13469494 X-Patchwork-Delegate: kw@linux.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="VAGhosd+" Received: from mail-qv1-xf34.google.com (mail-qv1-xf34.google.com [IPv6:2607:f8b0:4864:20::f34]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EFF04D5A for ; Mon, 27 Nov 2023 04:46:02 -0800 (PST) Received: by mail-qv1-xf34.google.com with SMTP id 6a1803df08f44-67a0e1ef63bso18435086d6.3 for ; Mon, 27 Nov 2023 04:46:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1701089162; x=1701693962; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=szORryW2l9J0pCg1kQG3OS6E1waFAt6BYGHK4qsw87M=; b=VAGhosd+z4xCejRdQEfPTtAgYbU0nVPbLa8Nq4RJjBNaj79B97hgFMQkObjHlqGfcr Znpb7txSt7DOV0k+R+G0cGz1HtkIuUJFIxd8VwpJrWG9rJul8rprB19xwhcyyAP1SxAq aDnUoo7auy4+MM78SavGy4XVDMpSo0ExF5M5R7nPY5ooj6+MqhR2IKb/oMz2hqx3mATW sa7P5U1ZougXN6WWfVXrwNnITBEIg5TaQoEGr40P+jUtjmV8merK8RhOrZ34/zQMhKjw 2KtYHfkU1rQR8KtaLmPNWZGqSkgNzXoYm8LBAPzPSZRXPE7G8P8S5opVdC9G9ozna4Ur K83w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701089162; x=1701693962; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=szORryW2l9J0pCg1kQG3OS6E1waFAt6BYGHK4qsw87M=; b=av0VMTJrt2impc7G9Ys6Zqz5Iar5mIy+R49Ps30ZIXp6x0E3QvrqOh6xcq3FZokGH2 oBZbqrTXEpYuoBX7IKcvRaYQe/Qn16aGKzFVdVD1GVipaImidb/mGZuz+/Q2Ez1zveJ6 VMaQUIQ2z4eUk0ch/a32RYbhS6B3/GZ5K3Yg527l1g7hypD9hJ9nxmxzGZDRgiuk8WEr /gXcX2yrbT8L+KLly/KNjcfEMSZntvzvfd6dhGXm6Eo1hluivhgSG3MayhouSt85TZzX WvlhwB9KmAmFa6aqJlTgB8BNw1wSN9VVeI0dKwfTDFwDmwQ2ANIXgdbzb3mIHKUDktgh d0ig== X-Gm-Message-State: AOJu0Ywlg2CX5wGme04HcZL7kHhxJ3Gr6ovNNPNjiMIl8YVI4ZNaxYyk lV16aorXLjmIC3ZOabf764LQ X-Google-Smtp-Source: AGHT+IGNZ+5w8hg9MvVkI8DO0QPnjtjCxvmdxlHAK2q1lIEDQmZD7Ge/AJWS0HSg8+MEFEMaOLLfag== X-Received: by 2002:a05:6214:5596:b0:67a:191f:2872 with SMTP id mi22-20020a056214559600b0067a191f2872mr12122455qvb.11.1701089162091; Mon, 27 Nov 2023 04:46:02 -0800 (PST) Received: from localhost.localdomain ([117.213.103.241]) by smtp.gmail.com with ESMTPSA id er10-20020a056214190a00b0067a204b4688sm2832231qvb.18.2023.11.27.04.45.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Nov 2023 04:46:01 -0800 (PST) From: Manivannan Sadhasivam To: lpieralisi@kernel.org, kw@linux.com Cc: kishon@kernel.org, bhelgaas@google.com, mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Manivannan Sadhasivam Subject: [PATCH 4/9] PCI: epf-mhi: Simulate async read/write using iATU Date: Mon, 27 Nov 2023 18:15:24 +0530 Message-Id: <20231127124529.78203-5-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231127124529.78203-1-manivannan.sadhasivam@linaro.org> References: <20231127124529.78203-1-manivannan.sadhasivam@linaro.org> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Even though iATU only supports synchronous read/write, the MHI stack may call async read/write callbacks without knowing the limitations of the controller driver. So in order to maintain compatibility, let's simulate async read/write operation with iATU by invoking the completion callback after memcpy. Signed-off-by: Manivannan Sadhasivam Reviewed-by: Krzysztof Wilczyński --- drivers/pci/endpoint/functions/pci-epf-mhi.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c index 34e7191f9508..7214f4da733b 100644 --- a/drivers/pci/endpoint/functions/pci-epf-mhi.c +++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c @@ -234,6 +234,9 @@ static int pci_epf_mhi_iatu_read(struct mhi_ep_cntrl *mhi_cntrl, mutex_unlock(&epf_mhi->lock); + if (buf_info->cb) + buf_info->cb(buf_info); + return 0; } @@ -262,6 +265,9 @@ static int pci_epf_mhi_iatu_write(struct mhi_ep_cntrl *mhi_cntrl, mutex_unlock(&epf_mhi->lock); + if (buf_info->cb) + buf_info->cb(buf_info); + return 0; }