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Message-ID: <20231020180139.GE46191@thinkpad>
Date: Fri, 20 Oct 2023 23:31:39 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Frank Li <Frank.Li@....com>
Cc: manivannan.sadhasivam@...aro.org, aisheng.dong@....com,
bhelgaas@...gle.com, devicetree@...r.kernel.org,
festevam@...il.com, imx@...ts.linux.dev, jdmason@...zu.us,
kernel@...gutronix.de, kishon@...nel.org, kw@...ux.com,
linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
lorenzo.pieralisi@....com, lpieralisi@...nel.org, maz@...nel.org,
s.hauer@...gutronix.de, shawnguo@...nel.org, tglx@...utronix.de
Subject: Re: [PATCH v2 4/5] misc: pci_endpoint_test: Add doorbell test case
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 <Frank.Li@....com>
> > ---
> > 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
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