On 8/17/2018 11:47 PM, Evan Green wrote:
Agree. In init , we get the valid hba pointer. So I can remove this check. Will update.On Thu, Aug 9, 2018 at 2:10 AM Sayali Lokhande <sayalil@xxxxxxxxxxxxxx> wrote:This patch adds configfs support to provision UFS device at runtime. This feature can be primarily useful in factory or assembly line as some devices may be required to be configured multiple times during initial system development phase. Configuration Descriptors can be written multiple times until bConfigDescrLock attribute is zero. Configuration descriptor buffer consists of Device and Unit descriptor configurable parameters which are parsed from vendor specific provisioning file and then passed via configfs node at runtime to provision ufs device. CONFIG_CONFIGFS_FS needs to be enabled for using this feature. Usage: 1) To read current configuration descriptor : cat /config/XXXX.ufshc/ufs_provision 2) To provision ufs device: echo <config_desc_buf> > /config/XXXX.ufshc/ufs_provision Signed-off-by: Sayali Lokhande <sayalil@xxxxxxxxxxxxxx> --- Documentation/ABI/testing/configfs-driver-ufs | 18 +++ drivers/scsi/ufs/Kconfig | 10 ++ drivers/scsi/ufs/Makefile | 1 + drivers/scsi/ufs/ufs-configfs.c | 159 ++++++++++++++++++++++++++ drivers/scsi/ufs/ufshcd.c | 7 +- drivers/scsi/ufs/ufshcd.h | 10 ++ 6 files changed, 204 insertions(+), 1 deletion(-) create mode 100644 Documentation/ABI/testing/configfs-driver-ufs create mode 100644 drivers/scsi/ufs/ufs-configfs.c diff --git a/Documentation/ABI/testing/configfs-driver-ufs b/Documentation/ABI/testing/configfs-driver-ufs new file mode 100644 index 0000000..eeee499c --- /dev/null +++ b/Documentation/ABI/testing/configfs-driver-ufs @@ -0,0 +1,18 @@ +What: /config/ufshcd/ufs_provision +Date: Jun 2018 +KernelVersion: 4.14 +Description: + This file shows the current ufs configuration descriptor set in device. + This can be used to provision ufs device if bConfigDescrLock is 0. + For more details, refer 14.1.6.3 Configuration Descriptor and + Table 14-12 - Unit Descriptor configurable parameters from specs for + description of each configuration descriptor parameter. + Configuration descriptor buffer needs to be passed in space separated + format specificied as below: + echo <bLength> <bDescriptorIDN> <bConfDescContinue> <bBootEnable> + <bDescrAccessEn> <bInitPowerMode> <bHighPriorityLUN> + <bSecureRemovalType> <bInitActiveICCLevel> <wPeriodicRTCUpdate> + <0Bh:0Fh_ReservedAs_0> <bLUEnable> <bBootLunID> <bLUWriteProtect> + <bMemoryType> <dNumAllocUnits> <bDataReliability> <bLogicalBlockSize> + <bProvisioningType> <wContextCapabilities> <0Dh:0Fh_ReservedAs_0> + > /config/XXXX.ufshc/ufs_provision diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig index e27b4d4..a9a0a58 100644 --- a/drivers/scsi/ufs/Kconfig +++ b/drivers/scsi/ufs/Kconfig @@ -100,3 +100,13 @@ config SCSI_UFS_QCOM Select this if you have UFS controller on QCOM chipset. If unsure, say N. + +config UFS_PROVISION + tristate "Runtime UFS Provisioning support" + depends on SCSI_UFSHCD && CONFIGFS_FS + help + This enables runtime UFS provisioning support. This can be used + primarily during assembly line as some devices may be required to + be configured multiple times during initial development phase. + + If unsure, say N. diff --git a/drivers/scsi/ufs/Makefile b/drivers/scsi/ufs/Makefile index 918f579..00110ea 100644 --- a/drivers/scsi/ufs/Makefile +++ b/drivers/scsi/ufs/Makefile @@ -5,5 +5,6 @@ obj-$(CONFIG_SCSI_UFS_DWC_TC_PLATFORM) += tc-dwc-g210-pltfrm.o ufshcd-dwc.o tc-d obj-$(CONFIG_SCSI_UFS_QCOM) += ufs-qcom.o obj-$(CONFIG_SCSI_UFSHCD) += ufshcd-core.o ufshcd-core-objs := ufshcd.o ufs-sysfs.o +obj-$(CONFIG_UFS_PROVISION) += ufs-configfs.o obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o obj-$(CONFIG_SCSI_UFSHCD_PLATFORM) += ufshcd-pltfrm.o diff --git a/drivers/scsi/ufs/ufs-configfs.c b/drivers/scsi/ufs/ufs-configfs.c new file mode 100644 index 0000000..cd1a227 --- /dev/null +++ b/drivers/scsi/ufs/ufs-configfs.c @@ -0,0 +1,159 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Copyright (c) 2018, Linux Foundation. + +#include <linux/configfs.h> +#include <linux/err.h> +#include <linux/string.h> + +#include "ufs.h" +#include "ufshcd.h" + +static inline struct ufs_hba *config_item_to_hba(struct config_item *item) +{ + struct config_group *group = to_config_group(item); + struct configfs_subsystem *subsys = to_configfs_subsystem(group); + struct ufs_hba *hba = container_of(subsys, struct ufs_hba, subsys); + + return subsys ? hba : NULL; +} + +static ssize_t ufs_provision_show(struct config_item *item, char *buf) +{ + u8 desc_buf[QUERY_DESC_CONFIGURATION_DEF_SIZE] = {0}; + int buff_len = QUERY_DESC_CONFIGURATION_DEF_SIZE; + int i, ret, curr_len = 0; + struct ufs_hba *hba = config_item_to_hba(item); + + if (!hba) + return -EINVAL;I don't think this is actually possible. Is a configfs show function ever called with a null item?
+ + ret = ufshcd_query_descriptor_retry(hba, UPIU_QUERY_OPCODE_READ_DESC, + QUERY_DESC_IDN_CONFIGURATION, 0, 0, desc_buf, &buff_len); + + if (ret) + return ret; + + for (i = 0; i < buff_len; i++) + curr_len += snprintf((buf + curr_len), (PAGE_SIZE - curr_len), + "0x%x ", desc_buf[i]); + + return curr_len; +} + +ssize_t ufshcd_desc_configfs_store(struct ufs_hba *hba, + const char *buf, size_t count) +{ + char *strbuf; + char *strbuf_copy; + u8 desc_buf[QUERY_DESC_CONFIGURATION_DEF_SIZE] = {0}; + int buff_len = QUERY_DESC_CONFIGURATION_DEF_SIZE; + char *token; + int i, ret, value; + u32 bConfigDescrLock = 0;I haven't seen many examples of variables named this way. I know it follows what the UFS spec does, but I haven't noticed examples of people naming their locals outside of normal Linux conventions.
Done. Will update the naming.
+ + /* reserve one byte for null termination */ + strbuf = kmalloc(count + 1, GFP_KERNEL); + if (!strbuf) + return -ENOMEM; + + strbuf_copy = strbuf; + strlcpy(strbuf, buf, count + 1); + + if (!hba) + goto out;Again, is this possible?
Done. will remove this check.
Agree. Will set the err val in return and check for error/ret set and return accordingly.+ + /* Just return if bConfigDescrLock is already set */ + ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, + QUERY_ATTR_IDN_CONF_DESC_LOCK, 0, 0, &bConfigDescrLock); + if (ret) + goto out; + + if (bConfigDescrLock) { + dev_err(hba->dev, "%s: bConfigDescrLock already set to %u, cannot re-provision device!\n", + __func__, bConfigDescrLock); + goto out;You're succeeding here, shouldn't you fail the write? In fact, you succeed the write in a whole bunch of failure cases. Please fail the write in error cases.
+ } + + for (i = 0; i < QUERY_DESC_CONFIGURATION_DEF_SIZE; i++) { + token = strsep(&strbuf, " "); + if (!token && i) + break; + + ret = kstrtoint(token, 0, &value); + if (ret) { + dev_err(hba->dev, "%s: kstrtoint failed %d %s\n", + __func__, ret, token); + goto out; + } + desc_buf[i] = (u8)value; + } + + /* Write configuration descriptor to provision ufs */ + ret = ufshcd_query_descriptor_retry(hba, UPIU_QUERY_OPCODE_WRITE_DESC, + QUERY_DESC_IDN_CONFIGURATION, 0, 0, desc_buf, &buff_len); + + if (!ret) + dev_err(hba->dev, "%s: UFS Provisioning done, reboot now!\n", + __func__); + +out: + kfree(strbuf_copy); + return count; +} + +static ssize_t ufs_provision_store(struct config_item *item, + const char *buf, size_t count) +{ + struct ufs_hba *hba = config_item_to_hba(item); + + return ufshcd_desc_configfs_store(hba, buf, count); +} + +static struct configfs_attribute ufshcd_attr_provision = { + .ca_name = "ufs_provision", + .ca_mode = 0644, + .ca_owner = THIS_MODULE, + .show = ufs_provision_show, + .store = ufs_provision_store, +}; + +static struct configfs_attribute *ufshcd_attrs[] = { + &ufshcd_attr_provision, + NULL, +}; + +static struct config_item_type ufscfg_type = { + .ct_attrs = ufshcd_attrs, + .ct_owner = THIS_MODULE, +}; + +static struct configfs_subsystem ufscfg_subsys = { + .su_group = { + .cg_item = { + .ci_type = &ufscfg_type, + }, + }, +}; + +int ufshcd_configfs_init(struct ufs_hba *hba, const char *name) +{ + int ret; + struct configfs_subsystem *subsys = &hba->subsys; + + strncpy(ufscfg_subsys.su_group.cg_item.ci_namebuf, name, strlen(name)); + subsys->su_group = ufscfg_subsys.su_group; + config_group_init(&subsys->su_group); + mutex_init(&subsys->su_mutex); + ret = configfs_register_subsystem(subsys); + if (ret) + pr_err("Error %d while registering subsystem %s\n", + ret, + subsys->su_group.cg_item.ci_namebuf); + + return ret; +} + +void ufshcd_configfs_exit(void) +{ + configfs_unregister_subsystem(&ufscfg_subsys); +} diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 0cbdde7..bc7bffc 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -7711,6 +7711,9 @@ int ufshcd_shutdown(struct ufs_hba *hba) void ufshcd_remove(struct ufs_hba *hba) { ufs_sysfs_remove_nodes(hba->dev); +#ifdef CONFIG_UFS_PROVISION + ufshcd_configfs_exit(); +#endif scsi_remove_host(hba->host); /* disable interrupts */ ufshcd_disable_intr(hba, hba->intr_mask); @@ -7964,7 +7967,9 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) async_schedule(ufshcd_async_scan, hba); ufs_sysfs_add_nodes(hba->dev); - +#ifdef CONFIG_UFS_PROVISION + ufshcd_configfs_init(hba, dev_name(hba->dev)); +#endifNormally the way I see this done is to define stub functions up in the header when !CONFIG_UFS_PROVISION, rather than ifdefs in the code. Can you do it that way?
Done. Will update.
return 0; out_remove_scsi_host: diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 101a75c..7b6cc88 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -37,6 +37,7 @@ #ifndef _UFSHCD_H #define _UFSHCD_H +#include <linux/configfs.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> @@ -515,6 +516,9 @@ struct ufs_hba { struct Scsi_Host *host; struct device *dev; +#ifdef CONFIG_UFS_PROVISION + struct configfs_subsystem subsys; +#endif /* * This field is to keep a reference to "scsi_device" corresponding to * "UFS device" W-LU. @@ -868,6 +872,12 @@ int ufshcd_read_string_desc(struct ufs_hba *hba, int desc_index, int ufshcd_hold(struct ufs_hba *hba, bool async); void ufshcd_release(struct ufs_hba *hba); +/* Expose UFS configfs API's */ +#ifdef CONFIG_UFS_PROVISION +extern int ufshcd_configfs_init(struct ufs_hba *hba, const char *name); +extern void ufshcd_configfs_exit(void); +#endif + int ufshcd_map_desc_id_to_length(struct ufs_hba *hba, enum desc_idn desc_id, int *desc_length); -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
