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 7600C21104; Fri, 20 Oct 2023 18:26:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="pv904BHa" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8387AC433C8; Fri, 20 Oct 2023 18:26:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1697826413; bh=jPvm+vw3CLG6JwUV21PGNZW9z38rg332T7A3ndx2J9k=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=pv904BHaMqG07yVrPbP1iExG17hESU1JBkiAbnEPugoSwW7XnO8OJKWePVdmmJZhE z+TtIvCCUALzMgBZm3xJbeLTcA6N6Mk91wl9x5CT4HfRR5/1lHjG3byLQ4VVRSfT8H pS9vhpeUnu9EIA3eRcJHXun0Eo4643I8dJf+LhJPh43Cj//b0CZZiZl7svfTf31Gmv 6RELDz/l2aBZFtE+jVZOKRfCiwIs4HNF/0gn8ftCVUbVBheyMAJkxxra+KZfso/BsJ t+Q0LKuEzYuylItnPIKJze5o/fAt9qgFHkIGsgEPu3fa6eqwGimU6WEzwSpQ3rNwUC kVwp8+GOAyGBw== Date: Fri, 20 Oct 2023 23:56:43 +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: <20231020182643.GG46191@thinkpad> References: <20230911220920.1817033-1-Frank.Li@nxp.com> <20230911220920.1817033-5-Frank.Li@nxp.com> <20231020175304.GC46191@thinkpad> <20231020180139.GE46191@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: On Fri, Oct 20, 2023 at 02:07:02PM -0400, Frank Li wrote: > On Fri, Oct 20, 2023 at 11:31:39PM +0530, Manivannan Sadhasivam wrote: > > 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? > > Doorbell register is not exist at old EP driver. If old EP driver register > size is 64Byte, doorbell register is 64 - 68. > Yes, I know! > Read unexisted, or unmapped space will cause kernel dump or other side > effects. > For sure it won't be unmapped as the BAR0 size is 512B. I thought we could infer something from the uninitialized registers. I need to think about other options. But changing the semantics of MAGIC register is a no-go. - Mani > Frank > > > > > - 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 -- 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 31E92C0032E for ; Fri, 20 Oct 2023 18:27:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: 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sin.source.kernel.org (Postfix) with ESMTP id 18BFECE3B10; Fri, 20 Oct 2023 18:26:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8387AC433C8; Fri, 20 Oct 2023 18:26:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1697826413; bh=jPvm+vw3CLG6JwUV21PGNZW9z38rg332T7A3ndx2J9k=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=pv904BHaMqG07yVrPbP1iExG17hESU1JBkiAbnEPugoSwW7XnO8OJKWePVdmmJZhE z+TtIvCCUALzMgBZm3xJbeLTcA6N6Mk91wl9x5CT4HfRR5/1lHjG3byLQ4VVRSfT8H pS9vhpeUnu9EIA3eRcJHXun0Eo4643I8dJf+LhJPh43Cj//b0CZZiZl7svfTf31Gmv 6RELDz/l2aBZFtE+jVZOKRfCiwIs4HNF/0gn8ftCVUbVBheyMAJkxxra+KZfso/BsJ t+Q0LKuEzYuylItnPIKJze5o/fAt9qgFHkIGsgEPu3fa6eqwGimU6WEzwSpQ3rNwUC kVwp8+GOAyGBw== Date: Fri, 20 Oct 2023 23:56:43 +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: <20231020182643.GG46191@thinkpad> References: <20230911220920.1817033-1-Frank.Li@nxp.com> <20230911220920.1817033-5-Frank.Li@nxp.com> <20231020175304.GC46191@thinkpad> <20231020180139.GE46191@thinkpad> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231020_112657_259965_55CAD580 X-CRM114-Status: GOOD ( 37.54 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: 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