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 8BE55208C1; Fri, 20 Oct 2023 18:01:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="QtMNsBaJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1C942C433C7; Fri, 20 Oct 2023 18:01:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1697824910; bh=zOJCG8xl57ebLi0HJCDV8JKToe5JmhU+GHr6FkPb0d4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=QtMNsBaJKR2XNWFKqrRBz/ayO0Vk0DizPVoXVqmLxH8PYILEGhmhftZ8wOwePzIgF 7Uqk4Cws/XLEgu2DqQsvSqWyG21EQN4hL7XpvUPGSRo8L0pDQNLeqr9KddzWQcyC2Z 4VV7ORE3Zc8ZWJA659E36xSBwS9InfABp/TA7/8PmzWR89Fxuz0VL89swTpflHekfI HnagXddKplSn697T/D4G4Ud5FJg2bjW6Nep4+a/2+hKpySc2ogoU1JCciYjDPXX8RB aZ5w8wgLlsCQcXpUzWdLUgFOpBd1ti4HvFnBD7nrPCXYdjAwaNV9rtYx9ylml46YAT L4be2l1yek8qA== Date: Fri, 20 Oct 2023 23:31:39 +0530 From: Manivannan Sadhasivam To: Frank Li Cc: manivannan.sadhasivam@linaro.org, aisheng.dong@nxp.com, bhelgaas@google.com, devicetree@vger.kernel.org, festevam@gmail.com, imx@lists.linux.dev, jdmason@kudzu.us, kernel@pengutronix.de, kishon@kernel.org, kw@linux.com, linux-arm-kernel@lists.infradead.org, linux-imx@nxp.com, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, lorenzo.pieralisi@arm.com, lpieralisi@kernel.org, maz@kernel.org, s.hauer@pengutronix.de, shawnguo@kernel.org, tglx@linutronix.de Subject: Re: [PATCH v2 4/5] misc: pci_endpoint_test: Add doorbell test case Message-ID: <20231020180139.GE46191@thinkpad> References: <20230911220920.1817033-1-Frank.Li@nxp.com> <20230911220920.1817033-5-Frank.Li@nxp.com> <20231020175304.GC46191@thinkpad> Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20231020175304.GC46191@thinkpad> On Fri, Oct 20, 2023 at 11:23:04PM +0530, Manivannan Sadhasivam wrote: > On Mon, Sep 11, 2023 at 06:09:19PM -0400, Frank Li wrote: > > Using bit 0..7 of magic as version number in pci_endpoint_test struct to > > support older driver versions. Save to 'version' field of struct > > pci_endpoint_test to prevent reading non-existent address. > > > > Since both drivers are in the kernel, I don't see a necessity to maintain > compatibility. Does it make sense to load drivers of previous kernel revision > with a new kernel? > Shoot... Sorry, I completely forgot that one is EP and another is host. Yes, we do need to maintain compatibility. But can't we use the doorbell register contents to determine that? - Mani > > Add three registers: PCIE_ENDPOINT_TEST_DB_BAR, PCIE_ENDPOINT_TEST_DB_ADDR, > > PCIE_ENDPOINT_TEST_DB_DATA. > > > > This patch is not adding these registers and not this driver also. So this > statement is wrong. > > > Write data from PCI_ENDPOINT_TEST_DB_DATA to address from > > PCI_ENDPOINT_TEST_DB_ADDR to trigger doorbell and wait for endpoint > > feedback. > > > > You can reuse a part of the commit description I suggested for previous patch. > > Rest looks good to me. > > - Mani > > > Signed-off-by: Frank Li > > --- > > drivers/misc/pci_endpoint_test.c | 48 ++++++++++++++++++++++++++++++++ > > include/uapi/linux/pcitest.h | 1 + > > 2 files changed, 49 insertions(+) > > > > diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c > > index ed4d0ef5e5c31..ed0b025132d17 100644 > > --- a/drivers/misc/pci_endpoint_test.c > > +++ b/drivers/misc/pci_endpoint_test.c > > @@ -33,6 +33,8 @@ > > #define IRQ_TYPE_MSIX 2 > > > > #define PCI_ENDPOINT_TEST_MAGIC 0x0 > > +#define PCI_MAGIC_VERSION_MASK GENMASK(7, 0) > > +#define PCI_ENDPOINT_TEST_V1 0x1 > > > > #define PCI_ENDPOINT_TEST_COMMAND 0x4 > > #define COMMAND_RAISE_LEGACY_IRQ BIT(0) > > @@ -52,6 +54,7 @@ > > #define STATUS_IRQ_RAISED BIT(6) > > #define STATUS_SRC_ADDR_INVALID BIT(7) > > #define STATUS_DST_ADDR_INVALID BIT(8) > > +#define STATUS_DOORBELL_SUCCESS BIT(9) > > > > #define PCI_ENDPOINT_TEST_LOWER_SRC_ADDR 0x0c > > #define PCI_ENDPOINT_TEST_UPPER_SRC_ADDR 0x10 > > @@ -66,7 +69,12 @@ > > #define PCI_ENDPOINT_TEST_IRQ_NUMBER 0x28 > > > > #define PCI_ENDPOINT_TEST_FLAGS 0x2c > > +#define PCI_ENDPOINT_TEST_DB_BAR 0x30 > > +#define PCI_ENDPOINT_TEST_DB_ADDR 0x34 > > +#define PCI_ENDPOINT_TEST_DB_DATA 0x38 > > + > > #define FLAG_USE_DMA BIT(0) > > +#define FLAG_SUPPORT_DOORBELL BIT(1) > > > > #define PCI_DEVICE_ID_TI_AM654 0xb00c > > #define PCI_DEVICE_ID_TI_J7200 0xb00f > > @@ -102,6 +110,7 @@ enum pci_barno { > > BAR_3, > > BAR_4, > > BAR_5, > > + NO_BAR = -1, > > }; > > > > struct pci_endpoint_test { > > @@ -118,6 +127,7 @@ struct pci_endpoint_test { > > enum pci_barno test_reg_bar; > > size_t alignment; > > const char *name; > > + u8 version; > > }; > > > > struct pci_endpoint_test_data { > > @@ -713,6 +723,38 @@ static bool pci_endpoint_test_set_irq(struct pci_endpoint_test *test, > > return false; > > } > > > > +static bool pci_endpoint_test_doorbell(struct pci_endpoint_test *test) > > +{ > > + enum pci_barno bar; > > + u32 data, status; > > + u32 addr; > > + > > + if (test->version < PCI_ENDPOINT_TEST_V1) > > + return false; > > + > > + bar = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_DB_BAR); > > + if (bar == NO_BAR) > > + return false; > > + > > + data = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_DB_DATA); > > + addr = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_DB_ADDR); > > + bar = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_DB_BAR); > > + > > + 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_STATUS, 0); > > + pci_endpoint_test_bar_writel(test, bar, addr, data); > > + > > + wait_for_completion_timeout(&test->irq_raised, msecs_to_jiffies(1000)); > > + > > + status = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_STATUS); > > + if (status & STATUS_DOORBELL_SUCCESS) > > + return true; > > + > > + return false; > > +} > > + > > static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd, > > unsigned long arg) > > { > > @@ -760,6 +802,9 @@ static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd, > > case PCITEST_CLEAR_IRQ: > > ret = pci_endpoint_test_clear_irq(test); > > break; > > + case PCITEST_DOORBELL: > > + ret = pci_endpoint_test_doorbell(test); > > + break; > > } > > > > ret: > > @@ -887,6 +932,9 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev, > > misc_device->parent = &pdev->dev; > > misc_device->fops = &pci_endpoint_test_fops; > > > > + test->version = FIELD_GET(PCI_MAGIC_VERSION_MASK, > > + pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_MAGIC)); > > + > > err = misc_register(misc_device); > > if (err) { > > dev_err(dev, "Failed to register device\n"); > > diff --git a/include/uapi/linux/pcitest.h b/include/uapi/linux/pcitest.h > > index f9c1af8d141b4..479ca1aa3ae0b 100644 > > --- a/include/uapi/linux/pcitest.h > > +++ b/include/uapi/linux/pcitest.h > > @@ -20,6 +20,7 @@ > > #define PCITEST_SET_IRQTYPE _IOW('P', 0x8, int) > > #define PCITEST_GET_IRQTYPE _IO('P', 0x9) > > #define PCITEST_CLEAR_IRQ _IO('P', 0x10) > > +#define PCITEST_DOORBELL _IO('P', 0x11) > > > > #define PCITEST_FLAGS_USE_DMA 0x00000001 > > > > -- > > 2.34.1 > > > > -- > மணிவண்ணன் சதாசிவம் -- மணிவண்ணன் சதாசிவம் 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 59EF6C0032E for ; Fri, 20 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