From patchwork Wed Nov 20 15:57:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Niklas Cassel X-Patchwork-Id: 13881344 X-Patchwork-Delegate: kw@linux.com 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 1D84F13A25B for ; Wed, 20 Nov 2024 15:57:45 +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=1732118266; cv=none; b=kKk0EQsACYbtvRRExGQNcHn3TGvwQZSkNtP3rLnfK9meCGJDMIumwfnRWcyF/DR0aVYxPjTMZPMfH5VEG3yJ+JeVSZ1SJOn9BRsBcj9WDFE5U3fOxWAvVNo2XZIrwLU7Jmk0PB4TQu1+RFrtXrlgNUnRk2m9CueeT5HeRYBAAvg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732118266; c=relaxed/simple; bh=vgjEZ06WtivJBmgilAxgBhMJTjGi0+iBsBjubLsQj2M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=G2yC9SNLtXzEYYWCUvckVPDBprqMD37mcrKkTmXlavQNKE39KGHuTCBDGJwvFZHhm0KXlCnxJbQGEX3n3DEbdnV50RCSbzb70+RUAGtI1GXu8s0neei3tSqvda2K9NCQap36m8hZyJ/JYx8zmxpYopA1dMeYTHiW7xgGPXnZoH8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=cJfEjjh7; 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="cJfEjjh7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2F4EEC4CED1; Wed, 20 Nov 2024 15:57:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732118265; bh=vgjEZ06WtivJBmgilAxgBhMJTjGi0+iBsBjubLsQj2M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cJfEjjh7bLNI+qoyWMVHblEiHuRBf9UFZbl92UROyC4FUf9wMkL+lXQw6w/PLPhl5 9iIN8dkuE9RovQk++ZgB9KHHNQbae1aBfl0/HTN7LBzx4vQfnWQNwos1XJL+C1KKHK vBSceoUmGxPcNPHGupGAolNt7Dm2boowk7Zn6eFsm4gu0uH8YVTTAKRHiaXz11MuzI i7nZkqYbPkU6U6GZ9fsFvaPvzbX/cUVgkMOVzaYbCNizPeIybwaR8wTpDON5Emlypt /GPv3UWSBO3yvCiRHiUtF3trabWDl95sxdJNnGCra7XhXSO14opGokc6T3ppLQUVv3 uqJke6/WL+J3w== From: Niklas Cassel To: Manivannan Sadhasivam , =?utf-8?q?Krzy?= =?utf-8?q?sztof_Wilczy=C5=84ski?= , Kishon Vijay Abraham I Cc: Damien Le Moal , linux-pci@vger.kernel.org, Frank Li , Niklas Cassel Subject: [PATCH 2/2] misc: pci_endpoint_test: Add support for capabilities Date: Wed, 20 Nov 2024 16:57:33 +0100 Message-ID: <20241120155730.2833836-6-cassel@kernel.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241120155730.2833836-4-cassel@kernel.org> References: <20241120155730.2833836-4-cassel@kernel.org> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2191; i=cassel@kernel.org; h=from:subject; bh=vgjEZ06WtivJBmgilAxgBhMJTjGi0+iBsBjubLsQj2M=; b=owGbwMvMwCV2MsVw8cxjvkWMp9WSGNLt2F67GLoIuIWXrfiVPc9y+srlDY96lp9ZdNTF0zhgY tOT5xaXOkpZGMS4GGTFFFl8f7jsL+52n3Jc8Y4NzBxWJpAhDFycAjARvmqGf7ZHNJ+aOXxbyVO6 /A6X6c8oMelp2lwBi+TMxZj3VGdOjmRkmPzjotCfbYo3a5xfuN9+8/IGc3eEk8i5uDItifsC228 2cwEA X-Developer-Key: i=cassel@kernel.org; a=openpgp; fpr=5ADE635C0E631CBBD5BE065A352FE6582ED9B5DA If running pci_endpoint_test.c (host side) against a version of pci-epf-test.c (EP side), we will not see any capabilities being set. For now, only add the CAP_HAS_ALIGN_ADDR capability. If the CAP_HAS_ALIGN_ADDR is set, that means that the EP side supports reading/writing to an address without any alignment requirements. Thus, if CAP_HAS_ALIGN_ADDR is set, make sure that we do not add any specific padding to the buffers that we allocate (which was only made in order to get the buffers to satisfy certain alignment requirements). Signed-off-by: Niklas Cassel --- drivers/misc/pci_endpoint_test.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c index 3aaaf47fa4ee..ab2b322410fb 100644 --- a/drivers/misc/pci_endpoint_test.c +++ b/drivers/misc/pci_endpoint_test.c @@ -69,6 +69,9 @@ #define PCI_ENDPOINT_TEST_FLAGS 0x2c #define FLAG_USE_DMA BIT(0) +#define PCI_ENDPOINT_TEST_CAPS 0x30 +#define CAP_HAS_ALIGN_ADDR BIT(0) + #define PCI_DEVICE_ID_TI_AM654 0xb00c #define PCI_DEVICE_ID_TI_J7200 0xb00f #define PCI_DEVICE_ID_TI_AM64 0xb010 @@ -805,6 +808,22 @@ static const struct file_operations pci_endpoint_test_fops = { .unlocked_ioctl = pci_endpoint_test_ioctl, }; +static void pci_endpoint_test_get_capabilities(struct pci_endpoint_test *test) +{ + struct pci_dev *pdev = test->pdev; + struct device *dev = &pdev->dev; + u32 caps; + bool has_align_addr; + + caps = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_CAPS); + + has_align_addr = caps & CAP_HAS_ALIGN_ADDR; + dev_dbg(dev, "CAP_HAS_ALIGN_ADDR: %d\n", has_align_addr); + + if (has_align_addr) + test->alignment = 0; +} + static int pci_endpoint_test_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { @@ -906,6 +925,8 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev, goto err_kfree_test_name; } + pci_endpoint_test_get_capabilities(test); + misc_device = &test->miscdev; misc_device->minor = MISC_DYNAMIC_MINOR; misc_device->name = kstrdup(name, GFP_KERNEL);