diff options
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/misc/altera-stapl/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/misc/c2port/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/misc/cb710/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/misc/cxl/Kconfig | 3 | ||||
| -rw-r--r-- | drivers/misc/echo/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/misc/eeprom/ee1004.c | 43 | ||||
| -rw-r--r-- | drivers/misc/genwqe/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/misc/lis3lv02d/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/misc/lkdtm/Makefile | 3 | ||||
| -rw-r--r-- | drivers/misc/mei/debugfs.c | 184 | ||||
| -rw-r--r-- | drivers/misc/mei/hdcp/mei_hdcp.c | 11 | ||||
| -rw-r--r-- | drivers/misc/ocxl/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/misc/sgi-xp/xpc_partition.c | 2 | ||||
| -rw-r--r-- | drivers/misc/vmw_balloon.c | 489 |
15 files changed, 533 insertions, 222 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 85fc77148d19..8ae6956e5d80 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -9,7 +9,6 @@ config SENSORS_LIS3LV02D tristate depends on INPUT select INPUT_POLLDEV - default n config AD525X_DPOT tristate "Analog Devices Digital Potentiometers" @@ -62,7 +61,6 @@ config ATMEL_TCLIB config DUMMY_IRQ tristate "Dummy IRQ handler" - default n ---help--- This module accepts a single 'irq' parameter, which it should register for. The sole purpose of this module is to help with debugging of systems on @@ -118,7 +116,6 @@ config PHANTOM config INTEL_MID_PTI tristate "Parallel Trace Interface for MIPI P1149.7 cJTAG standard" depends on PCI && TTY && (X86_INTEL_MID || COMPILE_TEST) - default n help The PTI (Parallel Trace Interface) driver directs trace data routed from various parts in the system out @@ -194,7 +191,6 @@ config ATMEL_SSC config ENCLOSURE_SERVICES tristate "Enclosure Services" - default n help Provides support for intelligent enclosures (bays which contain storage devices). You also need either a host @@ -218,7 +214,6 @@ config SGI_XP config CS5535_MFGPT tristate "CS5535/CS5536 Geode Multi-Function General Purpose Timer (MFGPT) support" depends on MFD_CS5535 - default n help This driver provides access to MFGPT functionality for other drivers that need timers. MFGPTs are available in the CS5535 and @@ -251,7 +246,6 @@ config CS5535_CLOCK_EVENT_SRC config HP_ILO tristate "Channel interface driver for the HP iLO processor" depends on PCI - default n help The channel interface driver allows applications to communicate with iLO management processors present on HP ProLiant servers. @@ -286,7 +280,6 @@ config QCOM_FASTRPC config SGI_GRU tristate "SGI GRU driver" depends on X86_UV && SMP - default n select MMU_NOTIFIER ---help--- The GRU is a hardware resource located in the system chipset. The GRU @@ -301,7 +294,6 @@ config SGI_GRU config SGI_GRU_DEBUG bool "SGI GRU driver debug" depends on SGI_GRU - default n ---help--- This option enables additional debugging code for the SGI GRU driver. If you are unsure, say N. @@ -359,7 +351,6 @@ config SENSORS_BH1770 config SENSORS_APDS990X tristate "APDS990X combined als and proximity sensors" depends on I2C - default n ---help--- Say Y here if you want to build a driver for Avago APDS990x combined ambient light and proximity sensor chip. @@ -387,7 +378,6 @@ config DS1682 config SPEAR13XX_PCIE_GADGET bool "PCIe gadget support for SPEAr13XX platform" depends on ARCH_SPEAR13XX && BROKEN - default n help This option enables gadget support for PCIe controller. If board file defines any controller as PCIe endpoint then a sysfs @@ -397,6 +387,7 @@ config SPEAR13XX_PCIE_GADGET config VMWARE_BALLOON tristate "VMware Balloon Driver" depends on VMWARE_VMCI && X86 && HYPERVISOR_GUEST + select MEMORY_BALLOON help This is VMware physical memory management driver which acts like a "balloon" that can be inflated to reclaim physical pages diff --git a/drivers/misc/altera-stapl/Kconfig b/drivers/misc/altera-stapl/Kconfig index b34863544365..6c4c6575ec31 100644 --- a/drivers/misc/altera-stapl/Kconfig +++ b/drivers/misc/altera-stapl/Kconfig @@ -5,6 +5,5 @@ comment "Altera FPGA firmware download module (requires I2C)" config ALTERA_STAPL tristate "Altera FPGA firmware download module" depends on I2C - default n help An Altera FPGA module. Say Y when you want to support this tool. diff --git a/drivers/misc/c2port/Kconfig b/drivers/misc/c2port/Kconfig index 192e25094bd4..e20516ffd91e 100644 --- a/drivers/misc/c2port/Kconfig +++ b/drivers/misc/c2port/Kconfig @@ -5,7 +5,6 @@ menuconfig C2PORT tristate "Silicon Labs C2 port support" - default n help This option enables support for Silicon Labs C2 port used to program Silicon micro controller chips (and other 8051 compatible). @@ -24,7 +23,6 @@ if C2PORT config C2PORT_DURAMAR_2150 tristate "C2 port support for Eurotech's Duramar 2150" depends on X86 - default n help This option enables C2 support for the Eurotech's Duramar 2150 on board micro controller. diff --git a/drivers/misc/cb710/Kconfig b/drivers/misc/cb710/Kconfig index 3c7356d55423..a696d7509024 100644 --- a/drivers/misc/cb710/Kconfig +++ b/drivers/misc/cb710/Kconfig @@ -15,7 +15,6 @@ config CB710_CORE config CB710_DEBUG bool "Enable driver debugging" depends on CB710_CORE != n - default n help This is an option for use by developers; most people should say N here. This adds a lot of debugging output to dmesg. diff --git a/drivers/misc/cxl/Kconfig b/drivers/misc/cxl/Kconfig index f1d9a843e361..39eec9031487 100644 --- a/drivers/misc/cxl/Kconfig +++ b/drivers/misc/cxl/Kconfig @@ -5,16 +5,13 @@ config CXL_BASE bool - default n select PPC_COPRO_BASE config CXL_AFU_DRIVER_OPS bool - default n config CXL_LIB bool - default n config CXL tristate "Support for IBM Coherent Accelerators (CXL)" diff --git a/drivers/misc/echo/Kconfig b/drivers/misc/echo/Kconfig index 39656413e70d..be70b263e271 100644 --- a/drivers/misc/echo/Kconfig +++ b/drivers/misc/echo/Kconfig @@ -1,7 +1,6 @@ # SPDX-License-Identifier: GPL-2.0-only config ECHO tristate "Line Echo Canceller support" - default n ---help--- This driver provides line echo cancelling support for mISDN and Zaptel drivers. diff --git a/drivers/misc/eeprom/ee1004.c b/drivers/misc/eeprom/ee1004.c index be3263df278a..6f00c33cfe22 100644 --- a/drivers/misc/eeprom/ee1004.c +++ b/drivers/misc/eeprom/ee1004.c @@ -2,7 +2,7 @@ /* * ee1004 - driver for DDR4 SPD EEPROMs * - * Copyright (C) 2017 Jean Delvare + * Copyright (C) 2017-2019 Jean Delvare * * Based on the at24 driver: * Copyright (C) 2005-2007 David Brownell @@ -53,6 +53,24 @@ MODULE_DEVICE_TABLE(i2c, ee1004_ids); /*-------------------------------------------------------------------------*/ +static int ee1004_get_current_page(void) +{ + int err; + + err = i2c_smbus_read_byte(ee1004_set_page[0]); + if (err == -ENXIO) { + /* Nack means page 1 is selected */ + return 1; + } + if (err < 0) { + /* Anything else is a real error, bail out */ + return err; + } + + /* Ack means page 0 is selected, returned value meaningless */ + return 0; +} + static ssize_t ee1004_eeprom_read(struct i2c_client *client, char *buf, unsigned int offset, size_t count) { @@ -102,6 +120,16 @@ static ssize_t ee1004_read(struct file *filp, struct kobject *kobj, /* Data is ignored */ status = i2c_smbus_write_byte(ee1004_set_page[page], 0x00); + if (status == -ENXIO) { + /* + * Don't give up just yet. Some memory + * modules will select the page but not + * ack the command. Check which page is + * selected now. + */ + if (ee1004_get_current_page() == page) + status = 0; + } if (status < 0) { dev_err(dev, "Failed to select page %d (%d)\n", page, status); @@ -186,17 +214,10 @@ static int ee1004_probe(struct i2c_client *client, } /* Remember current page to avoid unneeded page select */ - err = i2c_smbus_read_byte(ee1004_set_page[0]); - if (err == -ENXIO) { - /* Nack means page 1 is selected */ - ee1004_current_page = 1; - } else if (err < 0) { - /* Anything else is a real error, bail out */ + err = ee1004_get_current_page(); + if (err < 0) goto err_clients; - } else { - /* Ack means page 0 is selected, returned value meaningless */ - ee1004_current_page = 0; - } + ee1004_current_page = err; dev_dbg(&client->dev, "Currently selected page: %d\n", ee1004_current_page); mutex_unlock(&ee1004_bus_lock); diff --git a/drivers/misc/genwqe/Kconfig b/drivers/misc/genwqe/Kconfig index a8a608713d26..97f64bcf9fe0 100644 --- a/drivers/misc/genwqe/Kconfig +++ b/drivers/misc/genwqe/Kconfig @@ -7,7 +7,6 @@ menuconfig GENWQE tristate "GenWQE PCIe Accelerator" depends on PCI && 64BIT select CRC_ITU_T - default n help Enables PCIe card driver for IBM GenWQE accelerators. The user-space interface is described in diff --git a/drivers/misc/lis3lv02d/Kconfig b/drivers/misc/lis3lv02d/Kconfig index 4cfad45229c8..bb2fec4b5880 100644 --- a/drivers/misc/lis3lv02d/Kconfig +++ b/drivers/misc/lis3lv02d/Kconfig @@ -7,7 +7,6 @@ config SENSORS_LIS3_SPI tristate "STMicroeletronics LIS3LV02Dx three-axis digital accelerometer (SPI)" depends on !ACPI && SPI_MASTER && INPUT select SENSORS_LIS3LV02D - default n help This driver provides support for the LIS3LV02Dx accelerometer connected via SPI. The accelerometer data is readable via @@ -24,7 +23,6 @@ config SENSORS_LIS3_I2C tristate "STMicroeletronics LIS3LV02Dx three-axis digital accelerometer (I2C)" depends on I2C && INPUT select SENSORS_LIS3LV02D - default n help This driver provides support for the LIS3LV02Dx accelerometer connected via I2C. The accelerometer data is readable via diff --git a/drivers/misc/lkdtm/Makefile b/drivers/misc/lkdtm/Makefile index 951c984de61a..fb10eafe9bde 100644 --- a/drivers/misc/lkdtm/Makefile +++ b/drivers/misc/lkdtm/Makefile @@ -15,8 +15,7 @@ KCOV_INSTRUMENT_rodata.o := n OBJCOPYFLAGS := OBJCOPYFLAGS_rodata_objcopy.o := \ - --set-section-flags .text=alloc,readonly \ - --rename-section .text=.rodata + --rename-section .text=.rodata,alloc,readonly,load targets += rodata.o rodata_objcopy.o $(obj)/rodata_objcopy.o: $(obj)/rodata.o FORCE $(call if_changed,objcopy) diff --git a/drivers/misc/mei/debugfs.c b/drivers/misc/mei/debugfs.c index 0970142bcace..47cfd5005e1b 100644 --- a/drivers/misc/mei/debugfs.c +++ b/drivers/misc/mei/debugfs.c @@ -8,6 +8,7 @@ #include <linux/kernel.h> #include <linux/device.h> #include <linux/debugfs.h> +#include <linux/seq_file.h> #include <linux/mei.h> @@ -15,104 +16,56 @@ #include "client.h" #include "hw.h" -static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf, - size_t cnt, loff_t *ppos) +static int mei_dbgfs_meclients_show(struct seq_file *m, void *unused) { - struct mei_device *dev = fp->private_data; + struct mei_device *dev = m->private; struct mei_me_client *me_cl; - size_t bufsz = 1; - char *buf; int i = 0; - int pos = 0; - int ret; -#define HDR \ -" |id|fix| UUID |con|msg len|sb|refc|\n" + if (!dev) + return -ENODEV; down_read(&dev->me_clients_rwsem); - list_for_each_entry(me_cl, &dev->me_clients, list) - bufsz++; - bufsz *= sizeof(HDR) + 1; - buf = kzalloc(bufsz, GFP_KERNEL); - if (!buf) { - up_read(&dev->me_clients_rwsem); - return -ENOMEM; - } - - pos += scnprintf(buf + pos, bufsz - pos, HDR); -#undef HDR + seq_puts(m, " |id|fix| UUID |con|msg len|sb|refc|\n"); /* if the driver is not enabled the list won't be consistent */ if (dev->dev_state != MEI_DEV_ENABLED) goto out; list_for_each_entry(me_cl, &dev->me_clients, list) { - - if (mei_me_cl_get(me_cl)) { - pos += scnprintf(buf + pos, bufsz - pos, - "%2d|%2d|%3d|%pUl|%3d|%7d|%2d|%4d|\n", - i++, me_cl->client_id, - me_cl->props.fixed_address, - &me_cl->props.protocol_name, - me_cl->props.max_number_of_connections, - me_cl->props.max_msg_length, - me_cl->props.single_recv_buf, - kref_read(&me_cl->refcnt)); - - mei_me_cl_put(me_cl); - } + if (!mei_me_cl_get(me_cl)) + continue; + + seq_printf(m, "%2d|%2d|%3d|%pUl|%3d|%7d|%2d|%4d|\n", + i++, me_cl->client_id, + me_cl->props.fixed_address, + &me_cl->props.protocol_name, + me_cl->props.max_number_of_connections, + me_cl->props.max_msg_length, + me_cl->props.single_recv_buf, + kref_read(&me_cl->refcnt)); + mei_me_cl_put(me_cl); } out: up_read(&dev->me_clients_rwsem); - ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos); - kfree(buf); - return ret; + return 0; } +DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_meclients); -static const struct file_operations mei_dbgfs_fops_meclients = { - .open = simple_open, - .read = mei_dbgfs_read_meclients, - .llseek = generic_file_llseek, -}; - -static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf, - size_t cnt, loff_t *ppos) +static int mei_dbgfs_active_show(struct seq_file *m, void *unused) { - struct mei_device *dev = fp->private_data; + struct mei_device *dev = m->private; struct mei_cl *cl; - size_t bufsz = 1; - char *buf; int i = 0; - int pos = 0; - int ret; - -#define HDR " |me|host|state|rd|wr|wrq\n" if (!dev) return -ENODEV; mutex_lock(&dev->device_lock); - /* - * if the driver is not enabled the list won't be consistent, - * we output empty table - */ - if (dev->dev_state == MEI_DEV_ENABLED) - list_for_each_entry(cl, &dev->file_list, link) - bufsz++; - - bufsz *= sizeof(HDR) + 1; - - buf = kzalloc(bufsz, GFP_KERNEL); - if (!buf) { - mutex_unlock(&dev->device_lock); - return -ENOMEM; - } - - pos += scnprintf(buf + pos, bufsz - pos, HDR); -#undef HDR + seq_puts(m, " |me|host|state|rd|wr|wrq\n"); /* if the driver is not enabled the list won't be consistent */ if (dev->dev_state != MEI_DEV_ENABLED) @@ -120,76 +73,44 @@ static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf, list_for_each_entry(cl, &dev->file_list, link) { - pos += scnprintf(buf + pos, bufsz - pos, - "%3d|%2d|%4d|%5d|%2d|%2d|%3u\n", - i, mei_cl_me_id(cl), cl->host_client_id, cl->state, - !list_empty(&cl->rd_completed), cl->writing_state, - cl->tx_cb_queued); + seq_printf(m, "%3d|%2d|%4d|%5d|%2d|%2d|%3u\n", + i, mei_cl_me_id(cl), cl->host_client_id, cl->state, + !list_empty(&cl->rd_completed), cl->writing_state, + cl->tx_cb_queued); i++; } out: mutex_unlock(&dev->device_lock); - ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos); - kfree(buf); - return ret; + return 0; } +DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_active); -static const struct file_operations mei_dbgfs_fops_active = { - .open = simple_open, - .read = mei_dbgfs_read_active, - .llseek = generic_file_llseek, -}; - -static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf, - size_t cnt, loff_t *ppos) +static int mei_dbgfs_devstate_show(struct seq_file *m, void *unused) { - struct mei_device *dev = fp->private_data; - const size_t bufsz = 1024; - char *buf = kzalloc(bufsz, GFP_KERNEL); - int pos = 0; - int ret; - - if (!buf) - return -ENOMEM; + struct mei_device *dev = m->private; - pos += scnprintf(buf + pos, bufsz - pos, "dev: %s\n", - mei_dev_state_str(dev->dev_state)); - pos += scnprintf(buf + pos, bufsz - pos, "hbm: %s\n", - mei_hbm_state_str(dev->hbm_state)); + seq_printf(m, "dev: %s\n", mei_dev_state_str(dev->dev_state)); + seq_printf(m, "hbm: %s\n", mei_hbm_state_str(dev->hbm_state)); if (dev->hbm_state >= MEI_HBM_ENUM_CLIENTS && dev->hbm_state <= MEI_HBM_STARTED) { - pos += scnprintf(buf + pos, bufsz - pos, "hbm features:\n"); - pos += scnprintf(buf + pos, bufsz - pos, "\tPG: %01d\n", - dev->hbm_f_pg_supported); - pos += scnprintf(buf + pos, bufsz - pos, "\tDC: %01d\n", - dev->hbm_f_dc_supported); - pos += scnprintf(buf + pos, bufsz - pos, "\tIE: %01d\n", - dev->hbm_f_ie_supported); - pos += scnprintf(buf + pos, bufsz - pos, "\tDOT: %01d\n", - dev->hbm_f_dot_supported); - pos += scnprintf(buf + pos, bufsz - pos, "\tEV: %01d\n", - dev->hbm_f_ev_supported); - pos += scnprintf(buf + pos, bufsz - pos, "\tFA: %01d\n", - dev->hbm_f_fa_supported); - pos += scnprintf(buf + pos, bufsz - pos, "\tOS: %01d\n", - dev->hbm_f_os_supported); - pos += scnprintf(buf + pos, bufsz - pos, "\tDR: %01d\n", - dev->hbm_f_dr_supported); + seq_puts(m, "hbm features:\n"); + seq_printf(m, "\tPG: %01d\n", dev->hbm_f_pg_supported); + seq_printf(m, "\tDC: %01d\n", dev->hbm_f_dc_supported); + seq_printf(m, "\tIE: %01d\n", dev->hbm_f_ie_supported); + seq_printf(m, "\tDOT: %01d\n", dev->hbm_f_dot_supported); + seq_printf(m, "\tEV: %01d\n", dev->hbm_f_ev_supported); + seq_printf(m, "\tFA: %01d\n", dev->hbm_f_fa_supported); + seq_printf(m, "\tOS: %01d\n", dev->hbm_f_os_supported); + seq_printf(m, "\tDR: %01d\n", dev->hbm_f_dr_supported); } - pos += scnprintf(buf + pos, bufsz - pos, "pg: %s, %s\n", - mei_pg_is_enabled(dev) ? "ENABLED" : "DISABLED", - mei_pg_state_str(mei_pg_state(dev))); - ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos); - kfree(buf); - return ret; + seq_printf(m, "pg: %s, %s\n", + mei_pg_is_enabled(dev) ? "ENABLED" : "DISABLED", + mei_pg_state_str(mei_pg_state(dev))); + return 0; } -static const struct file_operations mei_dbgfs_fops_devstate = { - .open = simple_open, - .read = mei_dbgfs_read_devstate, - .llseek = generic_file_llseek, -}; +DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_devstate); static ssize_t mei_dbgfs_write_allow_fa(struct file *file, const char __user *user_buf, @@ -208,7 +129,7 @@ static ssize_t mei_dbgfs_write_allow_fa(struct file *file, return ret; } -static const struct file_operations mei_dbgfs_fops_allow_fa = { +static const struct file_operations mei_dbgfs_allow_fa_fops = { .open = simple_open, .read = debugfs_read_file_bool, .write = mei_dbgfs_write_allow_fa, @@ -247,26 +168,26 @@ int mei_dbgfs_register(struct mei_device *dev, const char *name) dev->dbgfs_dir = dir; f = debugfs_create_file("meclients", S_IRUSR, dir, - dev, &mei_dbgfs_fops_meclients); + dev, &mei_dbgfs_meclients_fops); if (!f) { dev_err(dev->dev, "meclients: registration failed\n"); goto err; } f = debugfs_create_file("active", S_IRUSR, dir, - dev, &mei_dbgfs_fops_active); + dev, &mei_dbgfs_active_fops); if (!f) { dev_err(dev->dev, "active: registration failed\n"); goto err; } f = debugfs_create_file("devstate", S_IRUSR, dir, - dev, &mei_dbgfs_fops_devstate); + dev, &mei_dbgfs_devstate_fops); if (!f) { dev_err(dev->dev, "devstate: registration failed\n"); goto err; } f = debugfs_create_file("allow_fixed_address", S_IRUSR | S_IWUSR, dir, &dev->allow_fixed_address, - &mei_dbgfs_fops_allow_fa); + &mei_dbgfs_allow_fa_fops); if (!f) { dev_err(dev->dev, "allow_fixed_address: registration failed\n"); goto err; @@ -276,4 +197,3 @@ err: mei_dbgfs_deregister(dev); return -ENODEV; } - diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c index b07000202d4a..ed816939fb32 100644 --- a/drivers/misc/mei/hdcp/mei_hdcp.c +++ b/drivers/misc/mei/hdcp/mei_hdcp.c @@ -2,7 +2,7 @@ /* * Copyright © 2019 Intel Corporation * - * Mei_hdcp.c: HDCP client driver for mei bus + * mei_hdcp.c: HDCP client driver for mei bus * * Author: * Ramalingam C <ramalingam.c@intel.com> @@ -11,12 +11,9 @@ /** * DOC: MEI_HDCP Client Driver * - * This is a client driver to the mei_bus to make the HDCP2.2 services of - * ME FW available for the interested consumers like I915. - * - * This module will act as a translation layer between HDCP protocol - * implementor(I915) and ME FW by translating HDCP2.2 authentication - * messages to ME FW command payloads and vice versa. + * The mei_hdcp driver acts as a translation layer between HDCP 2.2 + * protocol implementer (I915) and ME FW by translating HDCP2.2 + * negotiation messages to ME FW command payloads and vice versa. */ #include <linux/module.h> diff --git a/drivers/misc/ocxl/Kconfig b/drivers/misc/ocxl/Kconfig index 7fb6d39d4c5a..1916fa65f2f2 100644 --- a/drivers/misc/ocxl/Kconfig +++ b/drivers/misc/ocxl/Kconfig @@ -5,7 +5,6 @@ config OCXL_BASE bool - default n select PPC_COPRO_BASE config OCXL diff --git a/drivers/misc/sgi-xp/xpc_partition.c b/drivers/misc/sgi-xp/xpc_partition.c index 3eba1c420cc0..782ce95d3f17 100644 --- a/drivers/misc/sgi-xp/xpc_partition.c +++ b/drivers/misc/sgi-xp/xpc_partition.c @@ -70,7 +70,7 @@ xpc_get_rsvd_page_pa(int nasid) unsigned long rp_pa = nasid; /* seed with nasid */ size_t len = 0; size_t buf_len = 0; - void *buf = buf; + void *buf = NULL; void *buf_base = NULL; enum xp_retval (*get_partition_rsvd_page_pa) (void *, u64 *, unsigned long *, size_t *) = diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c index ad807d5a3141..043eed845246 100644 --- a/drivers/misc/vmw_balloon.c +++ b/drivers/misc/vmw_balloon.c @@ -28,6 +28,8 @@ #include <linux/rwsem.h> #include <linux/slab.h> #include <linux/spinlock.h> +#include <linux/mount.h> +#include <linux/balloon_compaction.h> #include <linux/vmw_vmci_defs.h> #include <linux/vmw_vmci_api.h> #include <asm/hypervisor.h> @@ -38,25 +40,20 @@ MODULE_ALIAS("dmi:*:svnVMware*:*"); MODULE_ALIAS("vmware_vmmemctl"); MODULE_LICENSE("GPL"); -/* - * Use __GFP_HIGHMEM to allow pages from HIGHMEM zone. We don't allow wait - * (__GFP_RECLAIM) for huge page allocations. Use __GFP_NOWARN, to suppress page - * allocation failure warnings. Disallow access to emergency low-memory pools. - */ -#define VMW_HUGE_PAGE_ALLOC_FLAGS (__GFP_HIGHMEM|__GFP_NOWARN| \ - __GFP_NOMEMALLOC) +static bool __read_mostly vmwballoon_shrinker_enable; +module_param(vmwballoon_shrinker_enable, bool, 0444); +MODULE_PARM_DESC(vmwballoon_shrinker_enable, + "Enable non-cooperative out-of-memory protection. Disabled by default as it may degrade performance."); -/* - * Use __GFP_HIGHMEM to allow pages from HIGHMEM zone. We allow lightweight - * reclamation (__GFP_NORETRY). Use __GFP_NOWARN, to suppress page allocation - * failure warnings. Disallow access to emergency low-memory pools. - */ -#define VMW_PAGE_ALLOC_FLAGS (__GFP_HIGHMEM|__GFP_NOWARN| \ - __GFP_NOMEMALLOC|__GFP_NORETRY) +/* Delay in seconds after shrink before inflation. */ +#define VMBALLOON_SHRINK_DELAY (5) /* Maximum number of refused pages we accumulate during inflation cycle */ #define VMW_BALLOON_MAX_REFUSED 16 +/* Magic number for the balloon mount-point */ +#define BALLOON_VMW_MAGIC 0x0ba11007 + /* * Hypervisor communication port definitions. */ @@ -229,29 +226,26 @@ enum vmballoon_stat_general { VMW_BALLOON_STAT_TIMER, VMW_BALLOON_STAT_DOORBELL, VMW_BALLOON_STAT_RESET, - VMW_BALLOON_STAT_LAST = VMW_BALLOON_STAT_RESET + VMW_BALLOON_STAT_SHRINK, + VMW_BALLOON_STAT_SHRINK_FREE, + VMW_BALLOON_STAT_LAST = VMW_BALLOON_STAT_SHRINK_FREE }; #define VMW_BALLOON_STAT_NUM (VMW_BALLOON_STAT_LAST + 1) - static DEFINE_STATIC_KEY_TRUE(vmw_balloon_batching); static DEFINE_STATIC_KEY_FALSE(balloon_stat_enabled); struct vmballoon_ctl { struct list_head pages; struct list_head refused_pages; + struct list_head prealloc_pages; unsigned int n_refused_pages; unsigned int n_pages; enum vmballoon_page_size_type page_size; enum vmballoon_op op; }; -struct vmballoon_page_size { - /* list of reserved physical pages */ - struct list_head pages; -}; - /** * struct vmballoon_batch_entry - a batch entry for lock or unlock. * @@ -266,8 +260,6 @@ struct vmballoon_batch_entry { } __packed; struct vmballoon { - struct vmballoon_page_size page_sizes[VMW_BALLOON_NUM_PAGE_SIZES]; - /** * @max_page_size: maximum supported page size for ballooning. * @@ -340,6 +332,15 @@ struct vmballoon { */ struct page *page; + /** + * @shrink_timeout: timeout until the next inflation. + * + * After an shrink event, indicates the time in jiffies after which + * inflation is allowed again. Can be written concurrently with reads, + * so must use READ_ONCE/WRITE_ONCE when accessing. + */ + unsigned long shrink_timeout; + /* statistics */ struct vmballoon_stats *stats; @@ -348,9 +349,21 @@ struct vmballoon { struct dentry *dbg_entry; #endif + /** + * @b_dev_info: balloon device information descriptor. + */ + struct balloon_dev_info b_dev_info; + struct delayed_work dwork; /** + * @huge_pages - list of the inflated 2MB pages. + * + * Protected by @b_dev_info.pages_lock . + */ + struct list_head huge_pages; + + /** * @vmci_doorbell. * * Protected by @conf_sem. @@ -368,6 +381,20 @@ struct vmballoon { * Lock ordering: @conf_sem -> @comm_lock . */ spinlock_t comm_lock; + + /** + * @shrinker: shrinker interface that is used to avoid over-inflation. + */ + struct shrinker shrinker; + + /** + * @shrinker_registered: whether the shrinker was registered. + * + * The shrinker interface does not handle gracefully the removal of + * shrinker that was not registered before. This indication allows to + * simplify the unregistration process. + */ + bool shrinker_registered; }; static struct vmballoon balloon; @@ -642,15 +669,25 @@ static int vmballoon_alloc_page_list(struct vmballoon *b, unsigned int i; for (i = 0; i < req_n_pages; i++) { - if (ctl->page_size == VMW_BALLOON_2M_PAGE) - page = alloc_pages(VMW_HUGE_PAGE_ALLOC_FLAGS, - VMW_BALLOON_2M_ORDER); - else - page = alloc_page(VMW_PAGE_ALLOC_FLAGS); - - /* Update statistics */ - vmballoon_stats_page_inc(b, VMW_BALLOON_PAGE_STAT_ALLOC, - ctl->page_size); + /* + * First check if we happen to have pages that were allocated + * before. This happens when 2MB page rejected during inflation + * by the hypervisor, and then split into 4KB pages. + */ + if (!list_empty(&ctl->prealloc_pages)) { + page = list_first_entry(&ctl->prealloc_pages, + struct page, lru); + list_del(&page->lru); + } else { + if (ctl->page_size == VMW_BALLOON_2M_PAGE) + page = alloc_pages(__GFP_HIGHMEM|__GFP_NOWARN| + __GFP_NOMEMALLOC, VMW_BALLOON_2M_ORDER); + else + page = balloon_page_alloc(); + + vmballoon_stats_page_inc(b, VMW_BALLOON_PAGE_STAT_ALLOC, + ctl->page_size); + } if (page) { vmballoon_mark_page_offline(page, ctl->page_size); @@ -896,7 +933,8 @@ static void vmballoon_release_page_list(struct list_head *page_list, __free_pages(page, vmballoon_page_order(page_size)); } - *n_pages = 0; + if (n_pages) + *n_pages = 0; } @@ -942,6 +980,10 @@ static int64_t vmballoon_change(struct vmballoon *b) size - target < vmballoon_page_in_frames(VMW_BALLOON_2M_PAGE)) return 0; + /* If an out-of-memory recently occurred, inflation is disallowed. */ + if (target > size && time_before(jiffies, READ_ONCE(b->shrink_timeout))) + return 0; + return target - size; } @@ -961,9 +1003,22 @@ static void vmballoon_enqueue_page_list(struct vmballoon *b, unsigned int *n_pages, enum vmballoon_page_size_type page_size) { - struct vmballoon_page_size *page_size_info = &b->page_sizes[page_size]; + unsigned long flags; + + if (page_size == VMW_BALLOON_4K_PAGE) { + balloon_page_list_enqueue(&b->b_dev_info, pages); + } else { + /* + * Keep the huge pages in a local list which is not available + * for the balloon compaction mechanism. + */ + spin_lock_irqsave(&b->b_dev_info.pages_lock, flags); + list_splice_init(pages, &b->huge_pages); + __count_vm_events(BALLOON_INFLATE, *n_pages * + vmballoon_page_in_frames(VMW_BALLOON_2M_PAGE)); + spin_unlock_irqrestore(&b->b_dev_info.pages_lock, flags); + } - list_splice_init(pages, &page_size_info->pages); *n_pages = 0; } @@ -986,19 +1041,58 @@ static void vmballoon_dequeue_page_list(struct vmballoon *b, enum vmballoon_page_size_type page_size, unsigned int n_req_pages) { - struct vmballoon_page_size *page_size_info = &b->page_sizes[page_size]; struct page *page, *tmp; unsigned int i = 0; + unsigned long flags; + + /* In the case of 4k pages, use the compaction infrastructure */ + if (page_size == VMW_BALLOON_4K_PAGE) { + *n_pages = balloon_page_list_dequeue(&b->b_dev_info, pages, + n_req_pages); + return; + } - list_for_each_entry_safe(page, tmp, &page_size_info->pages, lru) { + /* 2MB pages */ + spin_lock_irqsave(&b->b_dev_info.pages_lock, flags); + list_for_each_entry_safe(page, tmp, &b->huge_pages, lru) { list_move(&page->lru, pages); if (++i == n_req_pages) break; } + + __count_vm_events(BALLOON_DEFLATE, + i * vmballoon_page_in_frames(VMW_BALLOON_2M_PAGE)); + spin_unlock_irqrestore(&b->b_dev_info.pages_lock, flags); *n_pages = i; } /** + * vmballoon_split_refused_pages() - Split the 2MB refused pages to 4k. + * + * If inflation of 2MB pages was denied by the hypervisor, it is likely to be + * due to one or few 4KB pages. These 2MB pages may keep being allocated and + * then being refused. To prevent this case, this function splits the refused + * pages into 4KB pages and adds them into @prealloc_pages list. + * + * @ctl: pointer for the %struct vmballoon_ctl, which defines the operation. + */ +static void vmballoon_split_refused_pages(struct vmballoon_ctl *ctl) +{ + struct page *page, *tmp; + unsigned int i, order; + + order = vmballoon_page_order(ctl->page_size); + + list_for_each_entry_safe(page, tmp, &ctl->refused_pages, lru) { + list_del(&page->lru); + split_page(page, order); + for (i = 0; i < (1 << order); i++) + list_add(&page[i].lru, &ctl->prealloc_pages); + } + ctl->n_refused_pages = 0; +} + +/** * vmballoon_inflate() - Inflate the balloon towards its target size. * * @b: pointer to the balloon. @@ -1009,6 +1103,7 @@ static void vmballoon_inflate(struct vmballoon *b) struct vmballoon_ctl ctl = { .pages = LIST_HEAD_INIT(ctl.pages), .refused_pages = LIST_HEAD_INIT(ctl.refused_pages), + .prealloc_pages = LIST_HEAD_INIT(ctl.prealloc_pages), .page_size = b->max_page_size, .op = VMW_BALLOON_INFLATE }; @@ -1056,10 +1151,10 @@ static void vmballoon_inflate(struct vmballoon *b) break; /* - * Ignore errors from locking as we now switch to 4k - * pages and we might get different errors. + * Split the refused pages to 4k. This will also empty + * the refused pages list. */ - vmballoon_release_refused_pages(b, &ctl); + vmballoon_split_refused_pages(&ctl); ctl.page_size--; } @@ -1073,6 +1168,8 @@ static void vmballoon_inflate(struct vmballoon *b) */ if (ctl.n_refused_pages != 0) vmballoon_release_refused_pages(b, &ctl); + + vmballoon_release_page_list(&ctl.prealloc_pages, NULL, ctl.page_size); } /** @@ -1411,6 +1508,90 @@ static void vmballoon_work(struct work_struct *work) } +/** + * vmballoon_shrinker_scan() - deflate the balloon due to memory pressure. + * @shrinker: pointer to the balloon shrinker. + * @sc: page reclaim information. + * + * Returns: number of pages that were freed during deflation. + */ +static unsigned long vmballoon_shrinker_scan(struct shrinker *shrinker, + struct shrink_control *sc) +{ + struct vmballoon *b = &balloon; + unsigned long deflated_frames; + + pr_debug("%s - size: %llu", __func__, atomic64_read(&b->size)); + + vmballoon_stats_gen_inc(b, VMW_BALLOON_STAT_SHRINK); + + /* + * If the lock is also contended for read, we cannot easily reclaim and + * we bail out. + */ + if (!down_read_trylock(&b->conf_sem)) + return 0; + + deflated_frames = vmballoon_deflate(b, sc->nr_to_scan, true); + + vmballoon_stats_gen_add(b, VMW_BALLOON_STAT_SHRINK_FREE, + deflated_frames); + + /* + * Delay future inflation for some time to mitigate the situations in + * which balloon continuously grows and shrinks. Use WRITE_ONCE() since + * the access is asynchronous. + */ + WRITE_ONCE(b->shrink_timeout, jiffies + HZ * VMBALLOON_SHRINK_DELAY); + + up_read(&b->conf_sem); + + return deflated_frames; +} + +/** + * vmballoon_shrinker_count() - return the number of ballooned pages. + * @shrinker: pointer to the balloon shrinker. + * @sc: page reclaim information. + * + * Returns: number of 4k pages that are allocated for the balloon and can + * therefore be reclaimed under pressure. + */ +static unsigned long vmballoon_shrinker_count(struct shrinker *shrinker, + struct shrink_control *sc) +{ + struct vmballoon *b = &balloon; + + return atomic64_read(&b->size); +} + +static void vmballoon_unregister_shrinker(struct vmballoon *b) +{ + if (b->shrinker_registered) + unregister_shrinker(&b->shrinker); + b->shrinker_registered = false; +} + +static int vmballoon_register_shrinker(struct vmballoon *b) +{ + int r; + + /* Do nothing if the shrinker is not enabled */ + if (!vmwballoon_shrinker_enable) + return 0; + + b->shrinker.scan_objects = vmballoon_shrinker_scan; + b->shrinker.count_objects = vmballoon_shrinker_count; + b->shrinker.seeks = DEFAULT_SEEKS; + + r = register_shrinker(&b->shrinker); + + if (r == 0) + b->shrinker_registered = true; + + return r; +} + /* * DEBUGFS Interface */ @@ -1428,6 +1609,8 @@ static const char * const vmballoon_stat_names[] = { [VMW_BALLOON_STAT_TIMER] = "timer", [VMW_BALLOON_STAT_DOORBELL] = "doorbell", [VMW_BALLOON_STAT_RESET] = "reset", + [VMW_BALLOON_STAT_SHRINK] = "shrink", + [VMW_BALLOON_STAT_SHRINK_FREE] = "shrinkFree" }; static int vmballoon_enable_stats(struct vmballoon *b) @@ -1552,9 +1735,204 @@ static inline void vmballoon_debugfs_exit(struct vmballoon *b) #endif /* CONFIG_DEBUG_FS */ + +#ifdef CONFIG_BALLOON_COMPACTION + +static struct dentry *vmballoon_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, + void *data) +{ + static const struct dentry_operations ops = { + .d_dname = simple_dname, + }; + + return mount_pseudo(fs_type, "balloon-vmware:", NULL, &ops, + BALLOON_VMW_MAGIC); +} + +static struct file_system_type vmballoon_fs = { + .name = "balloon-vmware", + .mount = vmballoon_mount, + .kill_sb = kill_anon_super, +}; + +static struct vfsmount *vmballoon_mnt; + +/** + * vmballoon_migratepage() - migrates a balloon page. + * @b_dev_info: balloon device information descriptor. + * @newpage: the page to which @page should be migrated. + * @page: a ballooned page that should be migrated. + * @mode: migration mode, ignored. + * + * This function is really open-coded, but that is according to the interface + * that balloon_compaction provides. + * + * Return: zero on success, -EAGAIN when migration cannot be performed + * momentarily, and -EBUSY if migration failed and should be retried + * with that specific page. + */ +static int vmballoon_migratepage(struct balloon_dev_info *b_dev_info, + struct page *newpage, struct page *page, + enum migrate_mode mode) +{ + unsigned long status, flags; + struct vmballoon *b; + int ret; + + b = container_of(b_dev_info, struct vmballoon, b_dev_info); + + /* + * If the semaphore is taken, there is ongoing configuration change + * (i.e., balloon reset), so try again. + */ + if (!down_read_trylock(&b->conf_sem)) + return -EAGAIN; + + spin_lock(&b->comm_lock); + /* + * We must start by deflating and not inflating, as otherwise the + * hypervisor may tell us that it has enough memory and the new page is + * not needed. Since the old page is isolated, we cannot use the list + * interface to unlock it, as the LRU field is used for isolation. + * Instead, we use the native interface directly. + */ + vmballoon_add_page(b, 0, page); + status = vmballoon_lock_op(b, 1, VMW_BALLOON_4K_PAGE, + VMW_BALLOON_DEFLATE); + + if (status == VMW_BALLOON_SUCCESS) + status = vmballoon_status_page(b, 0, &page); + + /* + * If a failure happened, let the migration mechanism know that it + * should not retry. + */ + if (status != VMW_BALLOON_SUCCESS) { + spin_unlock(&b->comm_lock); + ret = -EBUSY; + goto out_unlock; + } + + /* + * The page is isolated, so it is safe to delete it without holding + * @pages_lock . We keep holding @comm_lock since we will need it in a + * second. + */ + balloon_page_delete(page); + + put_page(page); + + /* Inflate */ + vmballoon_add_page(b, 0, newpage); + status = vmballoon_lock_op(b, 1, VMW_BALLOON_4K_PAGE, + VMW_BALLOON_INFLATE); + + if (status == VMW_BALLOON_SUCCESS) + status = vmballoon_status_page(b, 0, &newpage); + + spin_unlock(&b->comm_lock); + + if (status != VMW_BALLOON_SUCCESS) { + /* + * A failure happened. While we can deflate the page we just + * inflated, this deflation can also encounter an error. Instead + * we will decrease the size of the balloon to reflect the + * change and report failure. + */ + atomic64_dec(&b->size); + ret = -EBUSY; + } else { + /* + * Success. Take a reference for the page, and we will add it to + * the list after acquiring the lock. + */ + get_page(newpage); + ret = MIGRATEPAGE_SUCCESS; + } + + /* Update the balloon list under the @pages_lock */ + spin_lock_irqsave(&b->b_dev_info.pages_lock, flags); + + /* + * On inflation success, we already took a reference for the @newpage. + * If we succeed just insert it to the list and update the statistics + * under the lock. + */ + if (ret == MIGRATEPAGE_SUCCESS) { + balloon_page_insert(&b->b_dev_info, newpage); + __count_vm_event(BALLOON_MIGRATE); + } + + /* + * We deflated successfully, so regardless to the inflation success, we + * need to reduce the number of isolated_pages. + */ + b->b_dev_info.isolated_pages--; + spin_unlock_irqrestore(&b->b_dev_info.pages_lock, flags); + +out_unlock: + up_read(&b->conf_sem); + return ret; +} + +/** + * vmballoon_compaction_deinit() - removes compaction related data. + * + * @b: pointer to the balloon. + */ +static void vmballoon_compaction_deinit(struct vmballoon *b) +{ + if (!IS_ERR(b->b_dev_info.inode)) + iput(b->b_dev_info.inode); + + b->b_dev_info.inode = NULL; + kern_unmount(vmballoon_mnt); + vmballoon_mnt = NULL; +} + +/** + * vmballoon_compaction_init() - initialized compaction for the balloon. + * + * @b: pointer to the balloon. + * + * If during the initialization a failure occurred, this function does not + * perform cleanup. The caller must call vmballoon_compaction_deinit() in this + * case. + * + * Return: zero on success or error code on failure. + */ +static __init int vmballoon_compaction_init(struct vmballoon *b) +{ + vmballoon_mnt = kern_mount(&vmballoon_fs); + if (IS_ERR(vmballoon_mnt)) + return PTR_ERR(vmballoon_mnt); + + b->b_dev_info.migratepage = vmballoon_migratepage; + b->b_dev_info.inode = alloc_anon_inode(vmballoon_mnt->mnt_sb); + + if (IS_ERR(b->b_dev_info.inode)) + return PTR_ERR(b->b_dev_info.inode); + + b->b_dev_info.inode->i_mapping->a_ops = &balloon_aops; + return 0; +} + +#else /* CONFIG_BALLOON_COMPACTION */ + +static void vmballoon_compaction_deinit(struct vmballoon *b) +{ +} + +static int vmballoon_compaction_init(struct vmballoon *b) +{ + return 0; +} + +#endif /* CONFIG_BALLOON_COMPACTION */ + static int __init vmballoon_init(void) { - enum vmballoon_page_size_type page_size; int error; /* @@ -1564,17 +1942,26 @@ static int __init vmballoon_init(void) if (x86_hyper_type != X86_HYPER_VMWARE) return -ENODEV; - for (page_size = VMW_BALLOON_4K_PAGE; - page_size <= VMW_BALLOON_LAST_SIZE; page_size++) - INIT_LIST_HEAD(&balloon.page_sizes[page_size].pages); - - INIT_DELAYED_WORK(&balloon.dwork, vmballoon_work); + error = vmballoon_register_shrinker(&balloon); + if (error) + goto fail; + error = vmballoon_debugfs_init(&balloon); if (error) - return error; + goto fail; + + /* + * Initialization of compaction must be done after the call to + * balloon_devinfo_init() . + */ + balloon_devinfo_init(&balloon.b_dev_info); + error = vmballoon_compaction_init(&balloon); + if (error) + goto fail; + INIT_LIST_HEAD(&balloon.huge_pages); spin_lock_init(&balloon.comm_lock); init_rwsem(&balloon.conf_sem); balloon.vmci_doorbell = VMCI_INVALID_HANDLE; @@ -1585,6 +1972,10 @@ static int __init vmballoon_init(void) queue_delayed_work(system_freezable_wq, &balloon.dwork, 0); return 0; +fail: + vmballoon_unregister_shrinker(&balloon); + vmballoon_compaction_deinit(&balloon); + return error; } /* @@ -1597,6 +1988,7 @@ late_initcall(vmballoon_init); static void __exit vmballoon_exit(void) { + vmballoon_unregister_shrinker(&balloon); vmballoon_vmci_cleanup(&balloon); cancel_delayed_work_sync(&balloon.dwork); @@ -1609,5 +2001,8 @@ static void __exit vmballoon_exit(void) */ vmballoon_send_start(&balloon, 0); vmballoon_pop(&balloon); + + /* Only once we popped the balloon, compaction can be deinit */ + vmballoon_compaction_deinit(&balloon); } module_exit(vmballoon_exit); |