From: Brad Larson <blarson@amd.com> To: <andy.shevchenko@gmail.com> Cc: <adrian.hunter@intel.com>, <alcooperx@gmail.com>, <arnd@arndb.de>, <blarson@amd.com>, <brendan.higgins@linux.dev>, <briannorris@chromium.org>, <brijeshkumar.singh@amd.com>, <broonie@kernel.org>, <catalin.marinas@arm.com>, <davidgow@google.com>, <devicetree@vger.kernel.org>, <fancer.lancer@gmail.com>, <gerg@linux-m68k.org>, <gsomlo@gmail.com>, <krzk@kernel.org>, <krzysztof.kozlowski+dt@linaro.org>, <lee.jones@linaro.org>, <lee@kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>, <linux-mmc@vger.kernel.org>, <linux-spi@vger.kernel.org>, <p.yadav@ti.com>, <p.zabel@pengutronix.de>, <piotrs@cadence.com>, <rdunlap@infradead.org>, <robh+dt@kernel.org>, <samuel@sholland.org>, <skhan@linuxfoundation.org>, <suravee.suthikulpanit@amd.com>, <thomas.lendacky@amd.com>, <tonyhuang.sunplus@gmail.com>, <ulf.hansson@linaro.org>, <vaishnav.a@ti.com>, <will@kernel.org>, <yamada.masahiro@socionext.com> Subject: Re: [PATCH v12 15/15] soc: amd: Add support for AMD Pensando SoC Controller Date: Fri, 31 Mar 2023 15:26:41 -0700 [thread overview] Message-ID: <20230331222641.38009-1-blarson@amd.com> (raw) In-Reply-To: <CAHp75VcbDBUf2cH_6rRqn5RCGSEOWqE85Yn3gDhYiJPhGf1S=Q@mail.gmail.com> Hi Andy, Thanks for the review. On Thu, Mar 23, 2023 at 13:06 Andy Shevchenko <andy.shevchenko@gmail.com> wrote: > On Thu, Mar 23, 2023 at 2:11 AM Brad Larson <blarson@amd.com> wrote: >> >> The Pensando SoC controller is a SPI connected companion device >> that is present in all Pensando SoC board designs. The essential >> board management registers are accessed on chip select 0 with >> board mgmt IO support accessed using additional chip selects. > > ... > >> +config AMD_PENSANDO_CTRL >> + tristate "AMD Pensando SoC Controller" >> + depends on SPI_MASTER=y >> + depends on (ARCH_PENSANDO && OF) || COMPILE_TEST >> + default y if ARCH_PENSANDO > > default ARCH_PENSANDO Changed to default ARCH_PENSANDO >> + select REGMAP_SPI >> + select MFD_SYSCON > > ... > >> +/* >> + * AMD Pensando SoC Controller >> + * >> + * Userspace interface and reset driver support for SPI connected Pensando SoC >> + * controller device. This device is present in all Pensando SoC designs and >> + * contains board control/status regsiters and management IO support. > > registers ? Fixed the typo > ... > >> +#include <linux/cdev.h> >> +#include <linux/delay.h> >> +#include <linux/device.h> >> +#include <linux/err.h> >> +#include <linux/fs.h> >> +#include <linux/init.h> >> +#include <linux/module.h> >> +#include <linux/mutex.h> >> +#include <linux/of.h> >> +#include <linux/of_device.h> > > Seems semi-random. Are you sure you use this and not missing mod_devicetable.h? Added mod_devicetable.h. Removed delay.h, fs.h and of_device.h >> +#include <linux/reset-controller.h> >> +#include <linux/spi/spi.h> > >... > >> +struct penctrl_device { >> + struct spi_device *spi_dev; >> + struct reset_controller_dev rcdev; > > Perhaps swapping these two might provide a better code generation. Its a 96 byte struct with pointer followed by the reset controller. The spi_device variable is accessed frequently and rcdev during boot and ideally never again so if rcdev is mostly missing from cache that is fine. Likely the address of spi_dev is also in cache given it is periodically accessed. > ... > >> + struct spi_transfer t[2] = { 0 }; > > 0 is not needed. Dropped the 0. > ... > >> + if (_IOC_DIR(cmd) & _IOC_READ) >> + ret = !access_ok((void __user *)arg, _IOC_SIZE(cmd)); >> + else if (_IOC_DIR(cmd) & _IOC_WRITE) >> + ret = !access_ok((void __user *)arg, _IOC_SIZE(cmd)); > > > Maybe you should create a temporary variable as > > void __user *in = ... arg; Yes, created temp variable. > >> + if (ret) >> + return -EFAULT; > > ... > >> + /* Verify and prepare spi message */ > > SPI Changed to SPI >> + size = _IOC_SIZE(cmd); >> + if ((size % sizeof(struct penctrl_spi_xfer)) != 0) { > > ' != 0' is redundant. Fixed > >> + ret = -EINVAL; >> + goto done; >> + } >> + num_msgs = size / sizeof(struct penctrl_spi_xfer); > >> + if (num_msgs == 0) { >> + ret = -EINVAL; >> + goto done; >> + } > > Can be unified with a previous check as > > if (size == 0 || size % ...) Yes, made this change. >> + msg = memdup_user((struct penctrl_spi_xfer __user *)arg, size); >> + if (!msg) { >> + ret = PTR_ERR(msg); >> + goto done; >> + } > >... > >> + if (copy_from_user((void *)(uintptr_t)tx_buf, >> + (void __user *)msg->tx_buf, msg->len)) { > > Why are all these castings here? Yes, overkill, changed to: if (copy_from_user(tx_buf, (void __user *)msg->tx_buf, msg->len)) { > ... > >> + if (copy_to_user((void __user *)msg->rx_buf, >> + (void *)(uintptr_t)rx_buf, msg->len)) >> + ret = -EFAULT; > > Ditto. Changed to: if (copy_to_user((void __user *)msg->rx_buf, rx_buf, msg->len)) > ... > >> + struct spi_transfer t[2] = { 0 }; > > 0 is redundant. Dropped the 0. > ... > >> + struct spi_transfer t[1] = { 0 }; > > Ditto. Dropped the 0. > Why is this an array? Fixed, it's a single message and shouldn't be an array. > ... > >> + ret = spi_sync(spi_dev, &m); >> + return ret; > > return spi_sync(...); Fixed. > ... > >> + np = spi_dev->dev.parent->of_node; >> + ret = of_property_read_u32(np, "num-cs", &num_cs); > > Why not simply device_property_read_u32()? It can be and removed two lines with below result. Also changed the variable spi_dev to spi which is the more common usage. ret = device_property_read_u32(spi->dev.parent, "num-cs", &num_cs); if (ret) return dev_err_probe(&spi->dev, ret, "number of chip-selects not defined\n"); > ... > >> + cdev = cdev_alloc(); >> + if (!cdev) { >> + dev_err(&spi_dev->dev, "allocation of cdev failed"); >> + ret = -ENOMEM; > > ret = dev_err_probe(...); Fixed. >> + goto cdev_failed; >> + } > > ... > >> + ret = cdev_add(cdev, penctrl_devt, num_cs); >> + if (ret) { > >> + dev_err(&spi_dev->dev, "register of cdev failed"); > > dev_err_probe() ? Fixed. >> + goto cdev_delete; >> + } > > ... > >> + penctrl = kzalloc(sizeof(*penctrl), GFP_KERNEL); >> + if (!penctrl) { > >> + ret = -ENOMEM; >> + dev_err(&spi_dev->dev, "allocate driver data failed"); > > ret = dev_err_probe(); > But we do not print memory allocation failure messages. Fixed this way penctrl = kzalloc(sizeof(*penctrl), GFP_KERNEL); if (!penctrl) { ret = -ENOMEM; goto free_cdev; } > ... > >> + if (IS_ERR(dev)) { >> + ret = IS_ERR(dev); >> + dev_err(&spi_dev->dev, "error creating device\n"); > > ret = dev_err_probe(); Fixed. > ... > > + spi_set_drvdata(spi_dev, penctrl); > > Is it in use? Not used and now dropped. > ... > >> + penctrl->rcdev.of_node = spi_dev->dev.of_node; > > device_set_node(); Added: device_set_node(&spi->dev, dev_fwnode(dev)); > ... > >> + ret = reset_controller_register(&penctrl->rcdev); >> + if (ret) >> + return dev_err_probe(&spi_dev->dev, ret, >> + "failed to register reset controller\n"); >> + return ret; > > return 0; Yes, changed. > ... > >> + device_destroy(penctrl_class, penctrl_devt); > > Are you sure this is the correct API? Yes, however a probe error could call up to 5 APIs to clean up which resulted in this update: destroy_device: for (cs = 0; cs < num_cs; cs++) device_destroy(penctrl_class, MKDEV(MAJOR(penctrl_devt), cs)); kfree(penctrl); free_cdev: cdev_del(cdev); destroy_class: class_destroy(penctrl_class); unregister_chrdev: unregister_chrdev(MAJOR(penctrl_devt), "penctrl"); return ret; > ... > >> +#include <linux/types.h> >> +#include <linux/ioctl.h> > > Sorted? Swapped these Regards, Brad
WARNING: multiple messages have this Message-ID (diff)
From: Brad Larson <blarson@amd.com> To: <andy.shevchenko@gmail.com> Cc: <adrian.hunter@intel.com>, <alcooperx@gmail.com>, <arnd@arndb.de>, <blarson@amd.com>, <brendan.higgins@linux.dev>, <briannorris@chromium.org>, <brijeshkumar.singh@amd.com>, <broonie@kernel.org>, <catalin.marinas@arm.com>, <davidgow@google.com>, <devicetree@vger.kernel.org>, <fancer.lancer@gmail.com>, <gerg@linux-m68k.org>, <gsomlo@gmail.com>, <krzk@kernel.org>, <krzysztof.kozlowski+dt@linaro.org>, <lee.jones@linaro.org>, <lee@kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>, <linux-mmc@vger.kernel.org>, <linux-spi@vger.kernel.org>, <p.yadav@ti.com>, <p.zabel@pengutronix.de>, <piotrs@cadence.com>, <rdunlap@infradead.org>, <robh+dt@kernel.org>, <samuel@sholland.org>, <skhan@linuxfoundation.org>, <suravee.suthikulpanit@amd.com>, <thomas.lendacky@amd.com>, <tonyhuang.sunplus@gmail.com>, <ulf.hansson@linaro.org>, <vaishnav.a@ti.com>, <will@kernel.org>, <yamada.masahiro@socionext.com> Subject: Re: [PATCH v12 15/15] soc: amd: Add support for AMD Pensando SoC Controller Date: Fri, 31 Mar 2023 15:26:41 -0700 [thread overview] Message-ID: <20230331222641.38009-1-blarson@amd.com> (raw) In-Reply-To: <CAHp75VcbDBUf2cH_6rRqn5RCGSEOWqE85Yn3gDhYiJPhGf1S=Q@mail.gmail.com> Hi Andy, Thanks for the review. On Thu, Mar 23, 2023 at 13:06 Andy Shevchenko <andy.shevchenko@gmail.com> wrote: > On Thu, Mar 23, 2023 at 2:11 AM Brad Larson <blarson@amd.com> wrote: >> >> The Pensando SoC controller is a SPI connected companion device >> that is present in all Pensando SoC board designs. The essential >> board management registers are accessed on chip select 0 with >> board mgmt IO support accessed using additional chip selects. > > ... > >> +config AMD_PENSANDO_CTRL >> + tristate "AMD Pensando SoC Controller" >> + depends on SPI_MASTER=y >> + depends on (ARCH_PENSANDO && OF) || COMPILE_TEST >> + default y if ARCH_PENSANDO > > default ARCH_PENSANDO Changed to default ARCH_PENSANDO >> + select REGMAP_SPI >> + select MFD_SYSCON > > ... > >> +/* >> + * AMD Pensando SoC Controller >> + * >> + * Userspace interface and reset driver support for SPI connected Pensando SoC >> + * controller device. This device is present in all Pensando SoC designs and >> + * contains board control/status regsiters and management IO support. > > registers ? Fixed the typo > ... > >> +#include <linux/cdev.h> >> +#include <linux/delay.h> >> +#include <linux/device.h> >> +#include <linux/err.h> >> +#include <linux/fs.h> >> +#include <linux/init.h> >> +#include <linux/module.h> >> +#include <linux/mutex.h> >> +#include <linux/of.h> >> +#include <linux/of_device.h> > > Seems semi-random. Are you sure you use this and not missing mod_devicetable.h? Added mod_devicetable.h. Removed delay.h, fs.h and of_device.h >> +#include <linux/reset-controller.h> >> +#include <linux/spi/spi.h> > >... > >> +struct penctrl_device { >> + struct spi_device *spi_dev; >> + struct reset_controller_dev rcdev; > > Perhaps swapping these two might provide a better code generation. Its a 96 byte struct with pointer followed by the reset controller. The spi_device variable is accessed frequently and rcdev during boot and ideally never again so if rcdev is mostly missing from cache that is fine. Likely the address of spi_dev is also in cache given it is periodically accessed. > ... > >> + struct spi_transfer t[2] = { 0 }; > > 0 is not needed. Dropped the 0. > ... > >> + if (_IOC_DIR(cmd) & _IOC_READ) >> + ret = !access_ok((void __user *)arg, _IOC_SIZE(cmd)); >> + else if (_IOC_DIR(cmd) & _IOC_WRITE) >> + ret = !access_ok((void __user *)arg, _IOC_SIZE(cmd)); > > > Maybe you should create a temporary variable as > > void __user *in = ... arg; Yes, created temp variable. > >> + if (ret) >> + return -EFAULT; > > ... > >> + /* Verify and prepare spi message */ > > SPI Changed to SPI >> + size = _IOC_SIZE(cmd); >> + if ((size % sizeof(struct penctrl_spi_xfer)) != 0) { > > ' != 0' is redundant. Fixed > >> + ret = -EINVAL; >> + goto done; >> + } >> + num_msgs = size / sizeof(struct penctrl_spi_xfer); > >> + if (num_msgs == 0) { >> + ret = -EINVAL; >> + goto done; >> + } > > Can be unified with a previous check as > > if (size == 0 || size % ...) Yes, made this change. >> + msg = memdup_user((struct penctrl_spi_xfer __user *)arg, size); >> + if (!msg) { >> + ret = PTR_ERR(msg); >> + goto done; >> + } > >... > >> + if (copy_from_user((void *)(uintptr_t)tx_buf, >> + (void __user *)msg->tx_buf, msg->len)) { > > Why are all these castings here? Yes, overkill, changed to: if (copy_from_user(tx_buf, (void __user *)msg->tx_buf, msg->len)) { > ... > >> + if (copy_to_user((void __user *)msg->rx_buf, >> + (void *)(uintptr_t)rx_buf, msg->len)) >> + ret = -EFAULT; > > Ditto. Changed to: if (copy_to_user((void __user *)msg->rx_buf, rx_buf, msg->len)) > ... > >> + struct spi_transfer t[2] = { 0 }; > > 0 is redundant. Dropped the 0. > ... > >> + struct spi_transfer t[1] = { 0 }; > > Ditto. Dropped the 0. > Why is this an array? Fixed, it's a single message and shouldn't be an array. > ... > >> + ret = spi_sync(spi_dev, &m); >> + return ret; > > return spi_sync(...); Fixed. > ... > >> + np = spi_dev->dev.parent->of_node; >> + ret = of_property_read_u32(np, "num-cs", &num_cs); > > Why not simply device_property_read_u32()? It can be and removed two lines with below result. Also changed the variable spi_dev to spi which is the more common usage. ret = device_property_read_u32(spi->dev.parent, "num-cs", &num_cs); if (ret) return dev_err_probe(&spi->dev, ret, "number of chip-selects not defined\n"); > ... > >> + cdev = cdev_alloc(); >> + if (!cdev) { >> + dev_err(&spi_dev->dev, "allocation of cdev failed"); >> + ret = -ENOMEM; > > ret = dev_err_probe(...); Fixed. >> + goto cdev_failed; >> + } > > ... > >> + ret = cdev_add(cdev, penctrl_devt, num_cs); >> + if (ret) { > >> + dev_err(&spi_dev->dev, "register of cdev failed"); > > dev_err_probe() ? Fixed. >> + goto cdev_delete; >> + } > > ... > >> + penctrl = kzalloc(sizeof(*penctrl), GFP_KERNEL); >> + if (!penctrl) { > >> + ret = -ENOMEM; >> + dev_err(&spi_dev->dev, "allocate driver data failed"); > > ret = dev_err_probe(); > But we do not print memory allocation failure messages. Fixed this way penctrl = kzalloc(sizeof(*penctrl), GFP_KERNEL); if (!penctrl) { ret = -ENOMEM; goto free_cdev; } > ... > >> + if (IS_ERR(dev)) { >> + ret = IS_ERR(dev); >> + dev_err(&spi_dev->dev, "error creating device\n"); > > ret = dev_err_probe(); Fixed. > ... > > + spi_set_drvdata(spi_dev, penctrl); > > Is it in use? Not used and now dropped. > ... > >> + penctrl->rcdev.of_node = spi_dev->dev.of_node; > > device_set_node(); Added: device_set_node(&spi->dev, dev_fwnode(dev)); > ... > >> + ret = reset_controller_register(&penctrl->rcdev); >> + if (ret) >> + return dev_err_probe(&spi_dev->dev, ret, >> + "failed to register reset controller\n"); >> + return ret; > > return 0; Yes, changed. > ... > >> + device_destroy(penctrl_class, penctrl_devt); > > Are you sure this is the correct API? Yes, however a probe error could call up to 5 APIs to clean up which resulted in this update: destroy_device: for (cs = 0; cs < num_cs; cs++) device_destroy(penctrl_class, MKDEV(MAJOR(penctrl_devt), cs)); kfree(penctrl); free_cdev: cdev_del(cdev); destroy_class: class_destroy(penctrl_class); unregister_chrdev: unregister_chrdev(MAJOR(penctrl_devt), "penctrl"); return ret; > ... > >> +#include <linux/types.h> >> +#include <linux/ioctl.h> > > Sorted? Swapped these Regards, Brad _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2023-03-31 22:26 UTC|newest] Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-03-23 0:06 [PATCH v12 00/15] Support AMD Pensando Elba SoC Brad Larson 2023-03-23 0:06 ` Brad Larson 2023-03-23 0:06 ` [PATCH v12 01/15] dt-bindings: arm: add AMD Pensando boards Brad Larson 2023-03-23 0:06 ` Brad Larson 2023-03-23 0:06 ` [PATCH v12 02/15] dt-bindings: mmc: cdns: Add AMD Pensando Elba SoC Brad Larson 2023-03-23 0:06 ` Brad Larson 2023-03-23 6:36 ` Krzysztof Kozlowski 2023-03-23 6:36 ` Krzysztof Kozlowski 2023-03-23 0:06 ` [PATCH v12 03/15] dt-bindings: spi: cdns: Add compatible for " Brad Larson 2023-03-23 0:06 ` Brad Larson 2023-03-23 0:06 ` [PATCH v12 04/15] dt-bindings: spi: dw: Add AMD Pensando Elba SoC SPI Controller Brad Larson 2023-03-23 0:06 ` Brad Larson 2023-03-23 0:06 ` [PATCH v12 05/15] dt-bindings: soc: amd: amd,pensando-elba-ctrl: Add Pensando SoC Controller Brad Larson 2023-03-23 0:06 ` Brad Larson 2023-03-23 0:06 ` [PATCH v12 06/15] MAINTAINERS: Add entry for AMD PENSANDO Brad Larson 2023-03-23 0:06 ` Brad Larson 2023-03-23 0:06 ` [PATCH v12 07/15] arm64: Add config for AMD Pensando SoC platforms Brad Larson 2023-03-23 0:06 ` Brad Larson 2023-03-23 0:06 ` [PATCH v12 08/15] arm64: dts: Add AMD Pensando Elba SoC support Brad Larson 2023-03-23 0:06 ` Brad Larson 2023-03-23 0:06 ` [PATCH v12 09/15] spi: cadence-quadspi: Add compatible for AMD Pensando Elba SoC Brad Larson 2023-03-23 0:06 ` Brad Larson 2023-03-23 0:06 ` [PATCH v12 10/15] spi: dw: Add support " Brad Larson 2023-03-23 0:06 ` Brad Larson 2023-03-23 0:06 ` [PATCH v12 11/15] mmc: sdhci-cadence: Enable device specific override of writel() Brad Larson 2023-03-23 0:06 ` Brad Larson 2023-03-23 0:06 ` [PATCH v12 12/15] mmc: sdhci-cadence: Support device specific init during probe Brad Larson 2023-03-23 0:06 ` Brad Larson 2023-03-23 0:06 ` [PATCH v12 13/15] mmc: sdhci-cadence: Add AMD Pensando Elba SoC support Brad Larson 2023-03-23 0:06 ` Brad Larson 2023-03-23 10:42 ` Andy Shevchenko 2023-03-23 10:42 ` Andy Shevchenko 2023-03-23 0:06 ` [PATCH v12 14/15] mmc: sdhci-cadence: Support mmc hardware reset Brad Larson 2023-03-23 0:06 ` Brad Larson 2023-03-23 9:04 ` Philipp Zabel 2023-03-23 9:04 ` Philipp Zabel 2023-03-23 0:06 ` [PATCH v12 15/15] soc: amd: Add support for AMD Pensando SoC Controller Brad Larson 2023-03-23 0:06 ` Brad Larson 2023-03-23 11:06 ` Andy Shevchenko 2023-03-23 11:06 ` Andy Shevchenko 2023-03-31 22:26 ` Brad Larson [this message] 2023-03-31 22:26 ` Brad Larson
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