From 6038f373a3dc1f1c26496e60b6c40b164716f07e Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Sun, 15 Aug 2010 18:52:59 +0200 Subject: llseek: automatically add .llseek fop All file_operations should get a .llseek operation so we can make nonseekable_open the default for future file operations without a .llseek pointer. The three cases that we can automatically detect are no_llseek, seq_lseek and default_llseek. For cases where we can we can automatically prove that the file offset is always ignored, we use noop_llseek, which maintains the current behavior of not returning an error from a seek. New drivers should normally not use noop_llseek but instead use no_llseek and call nonseekable_open at open time. Existing drivers can be converted to do the same when the maintainer knows for certain that no user code relies on calling seek on the device file. The generated code is often incorrectly indented and right now contains comments that clarify for each added line why a specific variant was chosen. In the version that gets submitted upstream, the comments will be gone and I will manually fix the indentation, because there does not seem to be a way to do that using coccinelle. Some amount of new code is currently sitting in linux-next that should get the same modifications, which I will do at the end of the merge window. Many thanks to Julia Lawall for helping me learn to write a semantic patch that does all this. ===== begin semantic patch ===== // This adds an llseek= method to all file operations, // as a preparation for making no_llseek the default. // // The rules are // - use no_llseek explicitly if we do nonseekable_open // - use seq_lseek for sequential files // - use default_llseek if we know we access f_pos // - use noop_llseek if we know we don't access f_pos, // but we still want to allow users to call lseek // @ open1 exists @ identifier nested_open; @@ nested_open(...) { <+... nonseekable_open(...) ...+> } @ open exists@ identifier open_f; identifier i, f; identifier open1.nested_open; @@ int open_f(struct inode *i, struct file *f) { <+... ( nonseekable_open(...) | nested_open(...) ) ...+> } @ read disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ read_no_fpos disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { ... when != off } @ write @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ write_no_fpos @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { ... when != off } @ fops0 @ identifier fops; @@ struct file_operations fops = { ... }; @ has_llseek depends on fops0 @ identifier fops0.fops; identifier llseek_f; @@ struct file_operations fops = { ... .llseek = llseek_f, ... }; @ has_read depends on fops0 @ identifier fops0.fops; identifier read_f; @@ struct file_operations fops = { ... .read = read_f, ... }; @ has_write depends on fops0 @ identifier fops0.fops; identifier write_f; @@ struct file_operations fops = { ... .write = write_f, ... }; @ has_open depends on fops0 @ identifier fops0.fops; identifier open_f; @@ struct file_operations fops = { ... .open = open_f, ... }; // use no_llseek if we call nonseekable_open //////////////////////////////////////////// @ nonseekable1 depends on !has_llseek && has_open @ identifier fops0.fops; identifier nso ~= "nonseekable_open"; @@ struct file_operations fops = { ... .open = nso, ... +.llseek = no_llseek, /* nonseekable */ }; @ nonseekable2 depends on !has_llseek @ identifier fops0.fops; identifier open.open_f; @@ struct file_operations fops = { ... .open = open_f, ... +.llseek = no_llseek, /* open uses nonseekable */ }; // use seq_lseek for sequential files ///////////////////////////////////// @ seq depends on !has_llseek @ identifier fops0.fops; identifier sr ~= "seq_read"; @@ struct file_operations fops = { ... .read = sr, ... +.llseek = seq_lseek, /* we have seq_read */ }; // use default_llseek if there is a readdir /////////////////////////////////////////// @ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier readdir_e; @@ // any other fop is used that changes pos struct file_operations fops = { ... .readdir = readdir_e, ... +.llseek = default_llseek, /* readdir is present */ }; // use default_llseek if at least one of read/write touches f_pos ///////////////////////////////////////////////////////////////// @ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read.read_f; @@ // read fops use offset struct file_operations fops = { ... .read = read_f, ... +.llseek = default_llseek, /* read accesses f_pos */ }; @ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, ... + .llseek = default_llseek, /* write accesses f_pos */ }; // Use noop_llseek if neither read nor write accesses f_pos /////////////////////////////////////////////////////////// @ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; identifier write_no_fpos.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, .read = read_f, ... +.llseek = noop_llseek, /* read and write both use no f_pos */ }; @ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write_no_fpos.write_f; @@ struct file_operations fops = { ... .write = write_f, ... +.llseek = noop_llseek, /* write uses no f_pos */ }; @ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; @@ struct file_operations fops = { ... .read = read_f, ... +.llseek = noop_llseek, /* read uses no f_pos */ }; @ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; @@ struct file_operations fops = { ... +.llseek = noop_llseek, /* no read or write fn */ }; ===== End semantic patch ===== Signed-off-by: Arnd Bergmann Cc: Julia Lawall Cc: Christoph Hellwig --- drivers/scsi/pmcraid.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/scsi/pmcraid.c') diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c index ecc45c8b4e6b..4b8765785aeb 100644 --- a/drivers/scsi/pmcraid.c +++ b/drivers/scsi/pmcraid.c @@ -4165,6 +4165,7 @@ static const struct file_operations pmcraid_fops = { #ifdef CONFIG_COMPAT .compat_ioctl = pmcraid_chr_ioctl, #endif + .llseek = noop_llseek, }; -- cgit v1.2.2 From 592488a32b87daf27b92d2c1c5cdc440d1a1beae Mon Sep 17 00:00:00 2001 From: Anil Ravindranath Date: Wed, 13 Oct 2010 14:11:02 -0700 Subject: [SCSI] pmcraid: add support for set timestamp command and other fixes The following are the fixes in this patch: 1. Added support of set timestamp command in the driver 2. Pass all status code to mgmt application. Earlier we were passing only failed ones. 3. Call class_destroy after unregister_chrdev and pci_unregister_driver Signed-off-by: Anil Ravindranath Signed-off-by: James Bottomley --- drivers/scsi/pmcraid.c | 129 +++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 110 insertions(+), 19 deletions(-) (limited to 'drivers/scsi/pmcraid.c') diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c index 4b8765785aeb..cf89091e4c3d 100644 --- a/drivers/scsi/pmcraid.c +++ b/drivers/scsi/pmcraid.c @@ -1594,10 +1594,12 @@ static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance) cfg_entry = &ccn_hcam->cfg_entry; fw_version = be16_to_cpu(pinstance->inq_data->fw_version); - pmcraid_info - ("CCN(%x): %x type: %x lost: %x flags: %x res: %x:%x:%x:%x\n", + pmcraid_info("CCN(%x): %x timestamp: %llx type: %x lost: %x flags: %x \ + res: %x:%x:%x:%x\n", pinstance->ccn.hcam->ilid, pinstance->ccn.hcam->op_code, + ((pinstance->ccn.hcam->timestamp1) | + ((pinstance->ccn.hcam->timestamp2 & 0xffffffffLL) << 32)), pinstance->ccn.hcam->notification_type, pinstance->ccn.hcam->notification_lost, pinstance->ccn.hcam->flags, @@ -1850,6 +1852,7 @@ static void pmcraid_process_ccn(struct pmcraid_cmd *cmd) * none */ static void pmcraid_initiate_reset(struct pmcraid_instance *); +static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd); static void pmcraid_process_ldn(struct pmcraid_cmd *cmd) { @@ -1881,6 +1884,10 @@ static void pmcraid_process_ldn(struct pmcraid_cmd *cmd) lock_flags); return; } + if (fd_ioasc == PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC) { + pinstance->timestamp_error = 1; + pmcraid_set_timestamp(cmd); + } } else { dev_info(&pinstance->pdev->dev, "Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc); @@ -3363,7 +3370,7 @@ static struct pmcraid_sglist *pmcraid_alloc_sglist(int buflen) sg_size = buflen; for (i = 0; i < num_elem; i++) { - page = alloc_pages(GFP_KERNEL|GFP_DMA, order); + page = alloc_pages(GFP_KERNEL|GFP_DMA|__GFP_ZERO, order); if (!page) { for (j = i - 1; j >= 0; j--) __free_pages(sg_page(&scatterlist[j]), order); @@ -3739,6 +3746,7 @@ static long pmcraid_ioctl_passthrough( unsigned long request_buffer; unsigned long request_offset; unsigned long lock_flags; + void *ioasa; u32 ioasc; int request_size; int buffer_size; @@ -3780,6 +3788,11 @@ static long pmcraid_ioctl_passthrough( rc = __copy_from_user(buffer, (struct pmcraid_passthrough_ioctl_buffer *) arg, sizeof(struct pmcraid_passthrough_ioctl_buffer)); + + ioasa = + (void *)(arg + + offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa)); + if (rc) { pmcraid_err("ioctl: can't copy passthrough buffer\n"); rc = -EFAULT; @@ -3947,22 +3960,14 @@ static long pmcraid_ioctl_passthrough( } out_handle_response: - /* If the command failed for any reason, copy entire IOASA buffer and - * return IOCTL success. If copying IOASA to user-buffer fails, return + /* copy entire IOASA buffer and return IOCTL success. + * If copying IOASA to user-buffer fails, return * EFAULT */ - if (PMCRAID_IOASC_SENSE_KEY(le32_to_cpu(cmd->ioa_cb->ioasa.ioasc))) { - void *ioasa = - (void *)(arg + - offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa)); - - pmcraid_info("command failed with %x\n", - le32_to_cpu(cmd->ioa_cb->ioasa.ioasc)); - if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa, - sizeof(struct pmcraid_ioasa))) { - pmcraid_err("failed to copy ioasa buffer to user\n"); - rc = -EFAULT; - } + if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa, + sizeof(struct pmcraid_ioasa))) { + pmcraid_err("failed to copy ioasa buffer to user\n"); + rc = -EFAULT; } /* If the data transfer was from device, copy the data onto user @@ -5147,6 +5152,16 @@ static void pmcraid_release_buffers(struct pmcraid_instance *pinstance) pinstance->inq_data = NULL; pinstance->inq_data_baddr = 0; } + + if (pinstance->timestamp_data != NULL) { + pci_free_consistent(pinstance->pdev, + sizeof(struct pmcraid_timestamp_data), + pinstance->timestamp_data, + pinstance->timestamp_data_baddr); + + pinstance->timestamp_data = NULL; + pinstance->timestamp_data_baddr = 0; + } } /** @@ -5205,6 +5220,20 @@ static int __devinit pmcraid_init_buffers(struct pmcraid_instance *pinstance) return -ENOMEM; } + /* allocate DMAable memory for set timestamp data buffer */ + pinstance->timestamp_data = pci_alloc_consistent( + pinstance->pdev, + sizeof(struct pmcraid_timestamp_data), + &pinstance->timestamp_data_baddr); + + if (pinstance->timestamp_data == NULL) { + pmcraid_err("couldn't allocate DMA memory for \ + set time_stamp \n"); + pmcraid_release_buffers(pinstance); + return -ENOMEM; + } + + /* Initialize all the command blocks and add them to free pool. No * need to lock (free_pool_lock) as this is done in initialization * itself @@ -5609,6 +5638,68 @@ static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd) return; } +/** + * pmcraid_set_timestamp - set the timestamp to IOAFP + * + * @cmd: pointer to pmcraid_cmd structure + * + * Return Value + * 0 for success or non-zero for failure cases + */ +static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd) +{ + struct pmcraid_instance *pinstance = cmd->drv_inst; + struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb; + __be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN); + struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl; + + struct timeval tv; + __le64 timestamp; + + do_gettimeofday(&tv); + timestamp = tv.tv_sec * 1000; + + pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp); + pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8); + pinstance->timestamp_data->timestamp[2] = (__u8)((timestamp) >> 16); + pinstance->timestamp_data->timestamp[3] = (__u8)((timestamp) >> 24); + pinstance->timestamp_data->timestamp[4] = (__u8)((timestamp) >> 32); + pinstance->timestamp_data->timestamp[5] = (__u8)((timestamp) >> 40); + + pmcraid_reinit_cmdblk(cmd); + ioarcb->request_type = REQ_TYPE_SCSI; + ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE); + ioarcb->cdb[0] = PMCRAID_SCSI_SET_TIMESTAMP; + ioarcb->cdb[1] = PMCRAID_SCSI_SERVICE_ACTION; + memcpy(&(ioarcb->cdb[6]), &time_stamp_len, sizeof(time_stamp_len)); + + ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) + + offsetof(struct pmcraid_ioarcb, + add_data.u.ioadl[0])); + ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc)); + ioarcb->ioarcb_bus_addr &= ~(0x1FULL); + + ioarcb->request_flags0 |= NO_LINK_DESCS; + ioarcb->request_flags0 |= TRANSFER_DIR_WRITE; + ioarcb->data_transfer_length = + cpu_to_le32(sizeof(struct pmcraid_timestamp_data)); + ioadl = &(ioarcb->add_data.u.ioadl[0]); + ioadl->flags = IOADL_FLAGS_LAST_DESC; + ioadl->address = cpu_to_le64(pinstance->timestamp_data_baddr); + ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_timestamp_data)); + + if (!pinstance->timestamp_error) { + pinstance->timestamp_error = 0; + pmcraid_send_cmd(cmd, pmcraid_set_supported_devs, + PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler); + } else { + pmcraid_send_cmd(cmd, pmcraid_return_cmd, + PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler); + return; + } +} + + /** * pmcraid_init_res_table - Initialize the resource table * @cmd: pointer to pmcraid command struct @@ -5720,7 +5811,7 @@ static void pmcraid_init_res_table(struct pmcraid_cmd *cmd) /* release the resource list lock */ spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags); - pmcraid_set_supported_devs(cmd); + pmcraid_set_timestamp(cmd); } /** @@ -6054,10 +6145,10 @@ out_init: static void __exit pmcraid_exit(void) { pmcraid_netlink_release(); - class_destroy(pmcraid_class); unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS); pci_unregister_driver(&pmcraid_driver); + class_destroy(pmcraid_class); } module_init(pmcraid_init); -- cgit v1.2.2 From f281233d3eba15fb225d21ae2e228fd4553d824a Mon Sep 17 00:00:00 2001 From: Jeff Garzik Date: Tue, 16 Nov 2010 02:10:29 -0500 Subject: SCSI host lock push-down Move the mid-layer's ->queuecommand() invocation from being locked with the host lock to being unlocked to facilitate speeding up the critical path for drivers who don't need this lock taken anyway. The patch below presents a simple SCSI host lock push-down as an equivalent transformation. No locking or other behavior should change with this patch. All existing bugs and locking orders are preserved. Additionally, add one parameter to queuecommand, struct Scsi_Host * and remove one parameter from queuecommand, void (*done)(struct scsi_cmnd *) Scsi_Host* is a convenient pointer that most host drivers need anyway, and 'done' is redundant to struct scsi_cmnd->scsi_done. Minimal code disturbance was attempted with this change. Most drivers needed only two one-line modifications for their host lock push-down. Signed-off-by: Jeff Garzik Acked-by: James Bottomley Signed-off-by: Linus Torvalds --- drivers/scsi/pmcraid.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/scsi/pmcraid.c') diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c index cf89091e4c3d..5e76a624cb08 100644 --- a/drivers/scsi/pmcraid.c +++ b/drivers/scsi/pmcraid.c @@ -3478,7 +3478,7 @@ static int pmcraid_copy_sglist( * SCSI_MLQUEUE_DEVICE_BUSY if device is busy * SCSI_MLQUEUE_HOST_BUSY if host is busy */ -static int pmcraid_queuecommand( +static int pmcraid_queuecommand_lck( struct scsi_cmnd *scsi_cmd, void (*done) (struct scsi_cmnd *) ) @@ -3584,6 +3584,8 @@ static int pmcraid_queuecommand( return rc; } +static DEF_SCSI_QCMD(pmcraid_queuecommand) + /** * pmcraid_open -char node "open" entry, allowed only users with admin access */ -- cgit v1.2.2 From 5da61410054d125e63aeab9cc7a11874a69465c0 Mon Sep 17 00:00:00 2001 From: Anil Ravindranath Date: Tue, 16 Nov 2010 13:43:41 -0800 Subject: [SCSI] pmcraid: disable msix and expand device config entry Firmware requires a larger configuration entry size than the driver currently allows, and MSI-X pretty much doesn't work with current FW, so disable it for now. Signed-off-by: Anil Ravindranath Signed-off-by: James Bottomley --- drivers/scsi/pmcraid.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/scsi/pmcraid.c') diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c index 5e76a624cb08..300d59f389da 100644 --- a/drivers/scsi/pmcraid.c +++ b/drivers/scsi/pmcraid.c @@ -62,6 +62,7 @@ static unsigned int pmcraid_debug_log; static unsigned int pmcraid_disable_aen; static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST; +static unsigned int pmcraid_enable_msix; /* * Data structures to support multiple adapters by the LLD. @@ -4691,7 +4692,8 @@ pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance) int rc; struct pci_dev *pdev = pinstance->pdev; - if (pci_find_capability(pdev, PCI_CAP_ID_MSIX)) { + if ((pmcraid_enable_msix) && + (pci_find_capability(pdev, PCI_CAP_ID_MSIX))) { int num_hrrq = PMCRAID_NUM_MSIX_VECTORS; struct msix_entry entries[PMCRAID_NUM_MSIX_VECTORS]; int i; -- cgit v1.2.2