From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 64E35C433EF for ; Thu, 12 May 2022 14:08:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350206AbiELOIO (ORCPT ); Thu, 12 May 2022 10:08:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42342 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234455AbiELOIN (ORCPT ); Thu, 12 May 2022 10:08:13 -0400 Received: from lelv0143.ext.ti.com (lelv0143.ext.ti.com [198.47.23.248]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 18FBA6D38D; Thu, 12 May 2022 07:08:11 -0700 (PDT) Received: from lelv0266.itg.ti.com ([10.180.67.225]) by lelv0143.ext.ti.com (8.15.2/8.15.2) with ESMTP id 24CE824i057029; Thu, 12 May 2022 09:08:02 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1652364482; bh=bAoMx943Q9rqtr7fhOt5uzY1EsG5NvCGl5pz7GxU8QY=; h=Date:Subject:To:CC:References:From:In-Reply-To; b=Ax82AW3bL5Nzx2fFvj6unwM1TV+GACV2pK8dSjVUwj9qdknPDLZ7FYOyodQUwTgJg vlBAqDIsua5P0uqHdNsT7D7Xs2KQWrxZ7p6HC+DQh61HlTlAwVR44yzWiN6OcUJCk6 BDdErop87VpT09eDikFF108UFNJCNynGYrNmJIWA= Received: from DFLE109.ent.ti.com (dfle109.ent.ti.com [10.64.6.30]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 24CE81JK105932 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 12 May 2022 09:08:02 -0500 Received: from DFLE105.ent.ti.com (10.64.6.26) by DFLE109.ent.ti.com (10.64.6.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14; Thu, 12 May 2022 09:08:01 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DFLE105.ent.ti.com (10.64.6.26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14 via Frontend Transport; Thu, 12 May 2022 09:08:01 -0500 Received: from [10.24.69.159] (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 24CE7wEZ113139; Thu, 12 May 2022 09:07:59 -0500 Message-ID: <22388bdf-8ab5-ac43-d3bb-5dddb76f303c@ti.com> Date: Thu, 12 May 2022 19:37:58 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.0 Subject: Re: [PATCH V7] misc: pci_endpoint_test: simplify endpoint test read and write operations Content-Language: en-US To: Lorenzo Pieralisi , Li Chen CC: Bjorn Helgaas , Greg Kroah-Hartman , =?UTF-8?Q?Krzysztof_Wilczy=c5=84ski?= , Arnd Bergmann , Bjorn Helgaas , linux-pci , linux-kernel References: <20220208152106.GA476995@bhelgaas> <17edc630ef0.11d8ab06115620.4524266185949873552@zohomail.com> From: Kishon Vijay Abraham I In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Hi Chen, On 11/05/22 22:22, Lorenzo Pieralisi wrote: > Hi Kishon, > > On Tue, Feb 08, 2022 at 09:49:46PM -0500, Li Chen wrote: >> From: Li Chen >> >> Introduce pci_endpoint_epf_transfer_data to simplify >> read and write operations. >> >> Signed-off-by: Li Chen Sorry for the delay in looking into this. The read and write in it's current form is simple and easier to read. Don't think it has to be disturbed IMO. Thanks, Kishon >> --- >> Changes in V2: >> fix WARNING: line length of 108 exceeds 100 columns >> #128: FILE: drivers/misc/pci_endpoint_test.c:243: >> Changes in V3: >> This patch context doesn't change but resend with my Zoho mail account in that previous >> company mail will contain un-removeable proprietary messages. >> Changes in V4: >> Add "From:" to the first line of the message body. >> Changes in V5: >> tabify file >> replace enum EPF_WRITE/EPF_READ with WRITE/READ from linux/kernel.h >> get_random_bytes only when WRITE. >> Changes in V6: >> remove useless "Date:" and "Subject:" in message body, only preserve "From:" tag. >> Changes in V7: >> use /* */ comments to match the prevailing kernel comment style >> capitalize "RC" and "EP" since they're not real words. >> remove tabify in that the original code have no style issue if tab is 8-width. >> >> drivers/misc/pci_endpoint_test.c | 286 ++++++++++++------------------- >> 1 file changed, 106 insertions(+), 180 deletions(-) > > Please review these changes when you can, thanks. > > Lorenzo > >> diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c >> index 8f786a225dcf8..30adf0e4c36a0 100644 >> --- a/drivers/misc/pci_endpoint_test.c >> +++ b/drivers/misc/pci_endpoint_test.c >> @@ -12,6 +12,7 @@ >> #include >> #include >> #include >> +#include >> #include >> #include >> #include >> @@ -142,6 +143,109 @@ static inline u32 pci_endpoint_test_bar_readl(struct pci_endpoint_test *test, >> { >> return readl(test->bar[bar] + offset); >> } >> +static bool pci_endpoint_test_transfer_data(struct pci_endpoint_test *test, >> + unsigned long arg, const int operation) >> +{ >> + struct pci_endpoint_test_xfer_param param; >> + bool ret = false; >> + u32 flags = 0; >> + bool use_dma; >> + void *addr; >> + dma_addr_t phys_addr; >> + struct pci_dev *pdev = test->pdev; >> + struct device *dev = &pdev->dev; >> + void *orig_addr; >> + dma_addr_t orig_phys_addr; >> + size_t offset; >> + size_t alignment = test->alignment; >> + int irq_type = test->irq_type; >> + size_t size; >> + int err; >> + >> + err = copy_from_user(¶m, (void __user *)arg, sizeof(param)); >> + if (err != 0) { >> + dev_err(dev, "Failed to get transfer param\n"); >> + return false; >> + } >> + >> + size = param.size; >> + if (size > SIZE_MAX - alignment) >> + goto err; >> + >> + use_dma = !!(param.flags & PCITEST_FLAGS_USE_DMA); >> + if (use_dma) >> + flags |= FLAG_USE_DMA; >> + >> + if (irq_type < IRQ_TYPE_LEGACY || irq_type > IRQ_TYPE_MSIX) { >> + dev_err(dev, "Invalid IRQ type option\n"); >> + goto err; >> + } >> + >> + orig_addr = kzalloc(size + alignment, GFP_KERNEL); >> + if (!orig_addr) >> + goto err; >> + >> + if (operation == WRITE) >> + get_random_bytes(orig_addr, size + alignment); >> + >> + orig_phys_addr = dma_map_single(dev, orig_addr, size + alignment, >> + operation == WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE); >> + if (dma_mapping_error(dev, orig_phys_addr)) { >> + dev_err(dev, "failed to map source buffer address\n"); >> + goto err_phys_addr; >> + } >> + >> + if (alignment && !IS_ALIGNED(orig_phys_addr, alignment)) { >> + phys_addr = PTR_ALIGN(orig_phys_addr, alignment); >> + offset = phys_addr - orig_phys_addr; >> + addr = orig_addr + offset; >> + } else { >> + phys_addr = orig_phys_addr; >> + addr = orig_addr; >> + } >> + >> + if (operation == WRITE) { >> + >> + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_CHECKSUM, >> + crc32_le(~0, addr, size)); >> + >> + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_LOWER_SRC_ADDR, >> + lower_32_bits(phys_addr)); >> + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_UPPER_SRC_ADDR, >> + upper_32_bits(phys_addr)); >> + } else { >> + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_LOWER_DST_ADDR, >> + lower_32_bits(phys_addr)); >> + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_UPPER_DST_ADDR, >> + upper_32_bits(phys_addr)); >> + } >> + >> + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_SIZE, size); >> + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_FLAGS, flags); >> + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE, irq_type); >> + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, 1); >> + >> + /* if we ask RC to write to EP, then EP should do read operation, and vice versa. */ >> + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND, >> + operation == WRITE ? COMMAND_READ : COMMAND_WRITE); >> + >> + wait_for_completion(&test->irq_raised); >> + >> + dma_unmap_single(dev, orig_phys_addr, size + alignment, >> + operation == WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE); >> + >> + if (operation == WRITE) >> + ret = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_STATUS) & STATUS_READ_SUCCESS; >> + else >> + ret = crc32_le(~0, addr, size) == >> + pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_CHECKSUM); >> + >> +err_phys_addr: >> + kfree(orig_addr); >> + >> +err: >> + return ret; >> +} >> >> static inline void pci_endpoint_test_bar_writel(struct pci_endpoint_test *test, >> int bar, u32 offset, u32 value) >> @@ -473,191 +577,13 @@ static bool pci_endpoint_test_copy(struct pci_endpoint_test *test, >> static bool pci_endpoint_test_write(struct pci_endpoint_test *test, >> unsigned long arg) >> { >> - struct pci_endpoint_test_xfer_param param; >> - bool ret = false; >> - u32 flags = 0; >> - bool use_dma; >> - u32 reg; >> - void *addr; >> - dma_addr_t phys_addr; >> - struct pci_dev *pdev = test->pdev; >> - struct device *dev = &pdev->dev; >> - void *orig_addr; >> - dma_addr_t orig_phys_addr; >> - size_t offset; >> - size_t alignment = test->alignment; >> - int irq_type = test->irq_type; >> - size_t size; >> - u32 crc32; >> - int err; >> - >> - err = copy_from_user(¶m, (void __user *)arg, sizeof(param)); >> - if (err != 0) { >> - dev_err(dev, "Failed to get transfer param\n"); >> - return false; >> - } >> - >> - size = param.size; >> - if (size > SIZE_MAX - alignment) >> - goto err; >> - >> - use_dma = !!(param.flags & PCITEST_FLAGS_USE_DMA); >> - if (use_dma) >> - flags |= FLAG_USE_DMA; >> - >> - if (irq_type < IRQ_TYPE_LEGACY || irq_type > IRQ_TYPE_MSIX) { >> - dev_err(dev, "Invalid IRQ type option\n"); >> - goto err; >> - } >> - >> - orig_addr = kzalloc(size + alignment, GFP_KERNEL); >> - if (!orig_addr) { >> - dev_err(dev, "Failed to allocate address\n"); >> - ret = false; >> - goto err; >> - } >> - >> - get_random_bytes(orig_addr, size + alignment); >> - >> - orig_phys_addr = dma_map_single(dev, orig_addr, size + alignment, >> - DMA_TO_DEVICE); >> - if (dma_mapping_error(dev, orig_phys_addr)) { >> - dev_err(dev, "failed to map source buffer address\n"); >> - ret = false; >> - goto err_phys_addr; >> - } >> - >> - if (alignment && !IS_ALIGNED(orig_phys_addr, alignment)) { >> - phys_addr = PTR_ALIGN(orig_phys_addr, alignment); >> - offset = phys_addr - orig_phys_addr; >> - addr = orig_addr + offset; >> - } else { >> - phys_addr = orig_phys_addr; >> - addr = orig_addr; >> - } >> - >> - crc32 = crc32_le(~0, addr, size); >> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_CHECKSUM, >> - crc32); >> - >> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_LOWER_SRC_ADDR, >> - lower_32_bits(phys_addr)); >> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_UPPER_SRC_ADDR, >> - upper_32_bits(phys_addr)); >> - >> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_SIZE, size); >> - >> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_FLAGS, flags); >> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE, irq_type); >> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, 1); >> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND, >> - COMMAND_READ); >> - >> - wait_for_completion(&test->irq_raised); >> - >> - reg = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_STATUS); >> - if (reg & STATUS_READ_SUCCESS) >> - ret = true; >> - >> - dma_unmap_single(dev, orig_phys_addr, size + alignment, >> - DMA_TO_DEVICE); >> - >> -err_phys_addr: >> - kfree(orig_addr); >> - >> -err: >> - return ret; >> + return pci_endpoint_test_transfer_data(test, arg, WRITE); >> } >> >> static bool pci_endpoint_test_read(struct pci_endpoint_test *test, >> unsigned long arg) >> { >> - struct pci_endpoint_test_xfer_param param; >> - bool ret = false; >> - u32 flags = 0; >> - bool use_dma; >> - size_t size; >> - void *addr; >> - dma_addr_t phys_addr; >> - struct pci_dev *pdev = test->pdev; >> - struct device *dev = &pdev->dev; >> - void *orig_addr; >> - dma_addr_t orig_phys_addr; >> - size_t offset; >> - size_t alignment = test->alignment; >> - int irq_type = test->irq_type; >> - u32 crc32; >> - int err; >> - >> - err = copy_from_user(¶m, (void __user *)arg, sizeof(param)); >> - if (err) { >> - dev_err(dev, "Failed to get transfer param\n"); >> - return false; >> - } >> - >> - size = param.size; >> - if (size > SIZE_MAX - alignment) >> - goto err; >> - >> - use_dma = !!(param.flags & PCITEST_FLAGS_USE_DMA); >> - if (use_dma) >> - flags |= FLAG_USE_DMA; >> - >> - if (irq_type < IRQ_TYPE_LEGACY || irq_type > IRQ_TYPE_MSIX) { >> - dev_err(dev, "Invalid IRQ type option\n"); >> - goto err; >> - } >> - >> - orig_addr = kzalloc(size + alignment, GFP_KERNEL); >> - if (!orig_addr) { >> - dev_err(dev, "Failed to allocate destination address\n"); >> - ret = false; >> - goto err; >> - } >> - >> - orig_phys_addr = dma_map_single(dev, orig_addr, size + alignment, >> - DMA_FROM_DEVICE); >> - if (dma_mapping_error(dev, orig_phys_addr)) { >> - dev_err(dev, "failed to map source buffer address\n"); >> - ret = false; >> - goto err_phys_addr; >> - } >> - >> - if (alignment && !IS_ALIGNED(orig_phys_addr, alignment)) { >> - phys_addr = PTR_ALIGN(orig_phys_addr, alignment); >> - offset = phys_addr - orig_phys_addr; >> - addr = orig_addr + offset; >> - } else { >> - phys_addr = orig_phys_addr; >> - addr = orig_addr; >> - } >> - >> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_LOWER_DST_ADDR, >> - lower_32_bits(phys_addr)); >> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_UPPER_DST_ADDR, >> - upper_32_bits(phys_addr)); >> - >> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_SIZE, size); >> - >> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_FLAGS, flags); >> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE, irq_type); >> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, 1); >> - pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND, >> - COMMAND_WRITE); >> - >> - wait_for_completion(&test->irq_raised); >> - >> - dma_unmap_single(dev, orig_phys_addr, size + alignment, >> - DMA_FROM_DEVICE); >> - >> - crc32 = crc32_le(~0, addr, size); >> - if (crc32 == pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_CHECKSUM)) >> - ret = true; >> - >> -err_phys_addr: >> - kfree(orig_addr); >> -err: >> - return ret; >> + return pci_endpoint_test_transfer_data(test, arg, READ); >> } >> >> static bool pci_endpoint_test_clear_irq(struct pci_endpoint_test *test) >> -- >> 2.34.1 >> >>