diff options
Diffstat (limited to 'drivers/gpu/drm/vmwgfx/vmwgfx_msg.c')
| -rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_msg.c | 1190 |
1 files changed, 1190 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c new file mode 100644 index 000000000..50fa3df0b --- /dev/null +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c @@ -0,0 +1,1190 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT +/* + * Copyright 2016 VMware, Inc., Palo Alto, CA., USA + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR + * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE + * USE OR OTHER DEALINGS IN THE SOFTWARE. + * + */ + +#include <linux/objtool.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/cc_platform.h> + +#include <asm/hypervisor.h> +#include <drm/drm_ioctl.h> + +#include "vmwgfx_drv.h" +#include "vmwgfx_msg_x86.h" +#include "vmwgfx_msg_arm64.h" +#include "vmwgfx_mksstat.h" + +#define MESSAGE_STATUS_SUCCESS 0x0001 +#define MESSAGE_STATUS_DORECV 0x0002 +#define MESSAGE_STATUS_CPT 0x0010 +#define MESSAGE_STATUS_HB 0x0080 + +#define RPCI_PROTOCOL_NUM 0x49435052 +#define GUESTMSG_FLAG_COOKIE 0x80000000 + +#define RETRIES 3 + +#define VMW_HYPERVISOR_MAGIC 0x564D5868 + +#define VMW_PORT_CMD_MSG 30 +#define VMW_PORT_CMD_HB_MSG 0 +#define VMW_PORT_CMD_OPEN_CHANNEL (MSG_TYPE_OPEN << 16 | VMW_PORT_CMD_MSG) +#define VMW_PORT_CMD_CLOSE_CHANNEL (MSG_TYPE_CLOSE << 16 | VMW_PORT_CMD_MSG) +#define VMW_PORT_CMD_SENDSIZE (MSG_TYPE_SENDSIZE << 16 | VMW_PORT_CMD_MSG) +#define VMW_PORT_CMD_RECVSIZE (MSG_TYPE_RECVSIZE << 16 | VMW_PORT_CMD_MSG) +#define VMW_PORT_CMD_RECVSTATUS (MSG_TYPE_RECVSTATUS << 16 | VMW_PORT_CMD_MSG) + +#define VMW_PORT_CMD_MKS_GUEST_STATS 85 +#define VMW_PORT_CMD_MKSGS_RESET (0 << 16 | VMW_PORT_CMD_MKS_GUEST_STATS) +#define VMW_PORT_CMD_MKSGS_ADD_PPN (1 << 16 | VMW_PORT_CMD_MKS_GUEST_STATS) +#define VMW_PORT_CMD_MKSGS_REMOVE_PPN (2 << 16 | VMW_PORT_CMD_MKS_GUEST_STATS) + +#define HIGH_WORD(X) ((X & 0xFFFF0000) >> 16) + +#define MAX_USER_MSG_LENGTH PAGE_SIZE + +static u32 vmw_msg_enabled = 1; + +enum rpc_msg_type { + MSG_TYPE_OPEN, + MSG_TYPE_SENDSIZE, + MSG_TYPE_SENDPAYLOAD, + MSG_TYPE_RECVSIZE, + MSG_TYPE_RECVPAYLOAD, + MSG_TYPE_RECVSTATUS, + MSG_TYPE_CLOSE, +}; + +struct rpc_channel { + u16 channel_id; + u32 cookie_high; + u32 cookie_low; +}; + + + +/** + * vmw_open_channel + * + * @channel: RPC channel + * @protocol: + * + * Returns: 0 on success + */ +static int vmw_open_channel(struct rpc_channel *channel, unsigned int protocol) +{ + unsigned long eax, ebx, ecx, edx, si = 0, di = 0; + + VMW_PORT(VMW_PORT_CMD_OPEN_CHANNEL, + (protocol | GUESTMSG_FLAG_COOKIE), si, di, + 0, + VMW_HYPERVISOR_MAGIC, + eax, ebx, ecx, edx, si, di); + + if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0) + return -EINVAL; + + channel->channel_id = HIGH_WORD(edx); + channel->cookie_high = si; + channel->cookie_low = di; + + return 0; +} + + + +/** + * vmw_close_channel + * + * @channel: RPC channel + * + * Returns: 0 on success + */ +static int vmw_close_channel(struct rpc_channel *channel) +{ + unsigned long eax, ebx, ecx, edx, si, di; + + /* Set up additional parameters */ + si = channel->cookie_high; + di = channel->cookie_low; + + VMW_PORT(VMW_PORT_CMD_CLOSE_CHANNEL, + 0, si, di, + channel->channel_id << 16, + VMW_HYPERVISOR_MAGIC, + eax, ebx, ecx, edx, si, di); + + if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0) + return -EINVAL; + + return 0; +} + +/** + * vmw_port_hb_out - Send the message payload either through the + * high-bandwidth port if available, or through the backdoor otherwise. + * @channel: The rpc channel. + * @msg: NULL-terminated message. + * @hb: Whether the high-bandwidth port is available. + * + * Return: The port status. + */ +static unsigned long vmw_port_hb_out(struct rpc_channel *channel, + const char *msg, bool hb) +{ + unsigned long si, di, eax, ebx, ecx, edx; + unsigned long msg_len = strlen(msg); + + /* HB port can't access encrypted memory. */ + if (hb && !cc_platform_has(CC_ATTR_MEM_ENCRYPT)) { + unsigned long bp = channel->cookie_high; + u32 channel_id = (channel->channel_id << 16); + + si = (uintptr_t) msg; + di = channel->cookie_low; + + VMW_PORT_HB_OUT( + (MESSAGE_STATUS_SUCCESS << 16) | VMW_PORT_CMD_HB_MSG, + msg_len, si, di, + VMWARE_HYPERVISOR_HB | channel_id | + VMWARE_HYPERVISOR_OUT, + VMW_HYPERVISOR_MAGIC, bp, + eax, ebx, ecx, edx, si, di); + + return ebx; + } + + /* HB port not available. Send the message 4 bytes at a time. */ + ecx = MESSAGE_STATUS_SUCCESS << 16; + while (msg_len && (HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS)) { + unsigned int bytes = min_t(size_t, msg_len, 4); + unsigned long word = 0; + + memcpy(&word, msg, bytes); + msg_len -= bytes; + msg += bytes; + si = channel->cookie_high; + di = channel->cookie_low; + + VMW_PORT(VMW_PORT_CMD_MSG | (MSG_TYPE_SENDPAYLOAD << 16), + word, si, di, + channel->channel_id << 16, + VMW_HYPERVISOR_MAGIC, + eax, ebx, ecx, edx, si, di); + } + + return ecx; +} + +/** + * vmw_port_hb_in - Receive the message payload either through the + * high-bandwidth port if available, or through the backdoor otherwise. + * @channel: The rpc channel. + * @reply: Pointer to buffer holding reply. + * @reply_len: Length of the reply. + * @hb: Whether the high-bandwidth port is available. + * + * Return: The port status. + */ +static unsigned long vmw_port_hb_in(struct rpc_channel *channel, char *reply, + unsigned long reply_len, bool hb) +{ + unsigned long si, di, eax, ebx, ecx, edx; + + /* HB port can't access encrypted memory */ + if (hb && !cc_platform_has(CC_ATTR_MEM_ENCRYPT)) { + unsigned long bp = channel->cookie_low; + u32 channel_id = (channel->channel_id << 16); + + si = channel->cookie_high; + di = (uintptr_t) reply; + + VMW_PORT_HB_IN( + (MESSAGE_STATUS_SUCCESS << 16) | VMW_PORT_CMD_HB_MSG, + reply_len, si, di, + VMWARE_HYPERVISOR_HB | channel_id, + VMW_HYPERVISOR_MAGIC, bp, + eax, ebx, ecx, edx, si, di); + + return ebx; + } + + /* HB port not available. Retrieve the message 4 bytes at a time. */ + ecx = MESSAGE_STATUS_SUCCESS << 16; + while (reply_len) { + unsigned int bytes = min_t(unsigned long, reply_len, 4); + + si = channel->cookie_high; + di = channel->cookie_low; + + VMW_PORT(VMW_PORT_CMD_MSG | (MSG_TYPE_RECVPAYLOAD << 16), + MESSAGE_STATUS_SUCCESS, si, di, + channel->channel_id << 16, + VMW_HYPERVISOR_MAGIC, + eax, ebx, ecx, edx, si, di); + + if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0) + break; + + memcpy(reply, &ebx, bytes); + reply_len -= bytes; + reply += bytes; + } + + return ecx; +} + + +/** + * vmw_send_msg: Sends a message to the host + * + * @channel: RPC channel + * @msg: NULL terminated string + * + * Returns: 0 on success + */ +static int vmw_send_msg(struct rpc_channel *channel, const char *msg) +{ + unsigned long eax, ebx, ecx, edx, si, di; + size_t msg_len = strlen(msg); + int retries = 0; + + while (retries < RETRIES) { + retries++; + + /* Set up additional parameters */ + si = channel->cookie_high; + di = channel->cookie_low; + + VMW_PORT(VMW_PORT_CMD_SENDSIZE, + msg_len, si, di, + channel->channel_id << 16, + VMW_HYPERVISOR_MAGIC, + eax, ebx, ecx, edx, si, di); + + if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0) { + /* Expected success. Give up. */ + return -EINVAL; + } + + /* Send msg */ + ebx = vmw_port_hb_out(channel, msg, + !!(HIGH_WORD(ecx) & MESSAGE_STATUS_HB)); + + if ((HIGH_WORD(ebx) & MESSAGE_STATUS_SUCCESS) != 0) { + return 0; + } else if ((HIGH_WORD(ebx) & MESSAGE_STATUS_CPT) != 0) { + /* A checkpoint occurred. Retry. */ + continue; + } else { + break; + } + } + + return -EINVAL; +} +STACK_FRAME_NON_STANDARD(vmw_send_msg); + + +/** + * vmw_recv_msg: Receives a message from the host + * + * Note: It is the caller's responsibility to call kfree() on msg. + * + * @channel: channel opened by vmw_open_channel + * @msg: [OUT] message received from the host + * @msg_len: message length + */ +static int vmw_recv_msg(struct rpc_channel *channel, void **msg, + size_t *msg_len) +{ + unsigned long eax, ebx, ecx, edx, si, di; + char *reply; + size_t reply_len; + int retries = 0; + + + *msg_len = 0; + *msg = NULL; + + while (retries < RETRIES) { + retries++; + + /* Set up additional parameters */ + si = channel->cookie_high; + di = channel->cookie_low; + + VMW_PORT(VMW_PORT_CMD_RECVSIZE, + 0, si, di, + channel->channel_id << 16, + VMW_HYPERVISOR_MAGIC, + eax, ebx, ecx, edx, si, di); + + if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0) { + DRM_ERROR("Failed to get reply size for host message.\n"); + return -EINVAL; + } + + /* No reply available. This is okay. */ + if ((HIGH_WORD(ecx) & MESSAGE_STATUS_DORECV) == 0) + return 0; + + reply_len = ebx; + reply = kzalloc(reply_len + 1, GFP_KERNEL); + if (!reply) { + DRM_ERROR("Cannot allocate memory for host message reply.\n"); + return -ENOMEM; + } + + + /* Receive buffer */ + ebx = vmw_port_hb_in(channel, reply, reply_len, + !!(HIGH_WORD(ecx) & MESSAGE_STATUS_HB)); + if ((HIGH_WORD(ebx) & MESSAGE_STATUS_SUCCESS) == 0) { + kfree(reply); + reply = NULL; + if ((HIGH_WORD(ebx) & MESSAGE_STATUS_CPT) != 0) { + /* A checkpoint occurred. Retry. */ + continue; + } + + return -EINVAL; + } + + reply[reply_len] = '\0'; + + + /* Ack buffer */ + si = channel->cookie_high; + di = channel->cookie_low; + + VMW_PORT(VMW_PORT_CMD_RECVSTATUS, + MESSAGE_STATUS_SUCCESS, si, di, + channel->channel_id << 16, + VMW_HYPERVISOR_MAGIC, + eax, ebx, ecx, edx, si, di); + + if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0) { + kfree(reply); + reply = NULL; + if ((HIGH_WORD(ecx) & MESSAGE_STATUS_CPT) != 0) { + /* A checkpoint occurred. Retry. */ + continue; + } + + return -EINVAL; + } + + break; + } + + if (!reply) + return -EINVAL; + + *msg_len = reply_len; + *msg = reply; + + return 0; +} +STACK_FRAME_NON_STANDARD(vmw_recv_msg); + + +/** + * vmw_host_get_guestinfo: Gets a GuestInfo parameter + * + * Gets the value of a GuestInfo.* parameter. The value returned will be in + * a string, and it is up to the caller to post-process. + * + * @guest_info_param: Parameter to get, e.g. GuestInfo.svga.gl3 + * @buffer: if NULL, *reply_len will contain reply size. + * @length: size of the reply_buf. Set to size of reply upon return + * + * Returns: 0 on success + */ +int vmw_host_get_guestinfo(const char *guest_info_param, + char *buffer, size_t *length) +{ + struct rpc_channel channel; + char *msg, *reply = NULL; + size_t reply_len = 0; + + if (!vmw_msg_enabled) + return -ENODEV; + + if (!guest_info_param || !length) + return -EINVAL; + + msg = kasprintf(GFP_KERNEL, "info-get %s", guest_info_param); + if (!msg) { + DRM_ERROR("Cannot allocate memory to get guest info \"%s\".", + guest_info_param); + return -ENOMEM; + } + + if (vmw_open_channel(&channel, RPCI_PROTOCOL_NUM)) + goto out_open; + + if (vmw_send_msg(&channel, msg) || + vmw_recv_msg(&channel, (void *) &reply, &reply_len)) + goto out_msg; + + vmw_close_channel(&channel); + if (buffer && reply && reply_len > 0) { + /* Remove reply code, which are the first 2 characters of + * the reply + */ + reply_len = max(reply_len - 2, (size_t) 0); + reply_len = min(reply_len, *length); + + if (reply_len > 0) + memcpy(buffer, reply + 2, reply_len); + } + + *length = reply_len; + + kfree(reply); + kfree(msg); + + return 0; + +out_msg: + vmw_close_channel(&channel); + kfree(reply); +out_open: + *length = 0; + kfree(msg); + DRM_ERROR("Failed to get guest info \"%s\".", guest_info_param); + + return -EINVAL; +} + + +/** + * vmw_host_printf: Sends a log message to the host + * + * @fmt: Regular printf format string and arguments + * + * Returns: 0 on success + */ +__printf(1, 2) +int vmw_host_printf(const char *fmt, ...) +{ + va_list ap; + struct rpc_channel channel; + char *msg; + char *log; + int ret = 0; + + if (!vmw_msg_enabled) + return -ENODEV; + + if (!fmt) + return ret; + + va_start(ap, fmt); + log = kvasprintf(GFP_KERNEL, fmt, ap); + va_end(ap); + if (!log) { + DRM_ERROR("Cannot allocate memory for the log message.\n"); + return -ENOMEM; + } + + msg = kasprintf(GFP_KERNEL, "log %s", log); + if (!msg) { + DRM_ERROR("Cannot allocate memory for host log message.\n"); + kfree(log); + return -ENOMEM; + } + + if (vmw_open_channel(&channel, RPCI_PROTOCOL_NUM)) + goto out_open; + + if (vmw_send_msg(&channel, msg)) + goto out_msg; + + vmw_close_channel(&channel); + kfree(msg); + kfree(log); + + return 0; + +out_msg: + vmw_close_channel(&channel); +out_open: + kfree(msg); + kfree(log); + DRM_ERROR("Failed to send host log message.\n"); + + return -EINVAL; +} + + +/** + * vmw_msg_ioctl: Sends and receveives a message to/from host from/to user-space + * + * Sends a message from user-space to host. + * Can also receive a result from host and return that to user-space. + * + * @dev: Identifies the drm device. + * @data: Pointer to the ioctl argument. + * @file_priv: Identifies the caller. + * Return: Zero on success, negative error code on error. + */ + +int vmw_msg_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_vmw_msg_arg *arg = + (struct drm_vmw_msg_arg *)data; + struct rpc_channel channel; + char *msg; + int length; + + msg = kmalloc(MAX_USER_MSG_LENGTH, GFP_KERNEL); + if (!msg) { + DRM_ERROR("Cannot allocate memory for log message.\n"); + return -ENOMEM; + } + + length = strncpy_from_user(msg, (void __user *)((unsigned long)arg->send), + MAX_USER_MSG_LENGTH); + if (length < 0 || length >= MAX_USER_MSG_LENGTH) { + DRM_ERROR("Userspace message access failure.\n"); + kfree(msg); + return -EINVAL; + } + + + if (vmw_open_channel(&channel, RPCI_PROTOCOL_NUM)) { + DRM_ERROR("Failed to open channel.\n"); + goto out_open; + } + + if (vmw_send_msg(&channel, msg)) { + DRM_ERROR("Failed to send message to host.\n"); + goto out_msg; + } + + if (!arg->send_only) { + char *reply = NULL; + size_t reply_len = 0; + + if (vmw_recv_msg(&channel, (void *) &reply, &reply_len)) { + DRM_ERROR("Failed to receive message from host.\n"); + goto out_msg; + } + if (reply && reply_len > 0) { + if (copy_to_user((void __user *)((unsigned long)arg->receive), + reply, reply_len)) { + DRM_ERROR("Failed to copy message to userspace.\n"); + kfree(reply); + goto out_msg; + } + arg->receive_len = (__u32)reply_len; + } + kfree(reply); + } + + vmw_close_channel(&channel); + kfree(msg); + + return 0; + +out_msg: + vmw_close_channel(&channel); +out_open: + kfree(msg); + + return -EINVAL; +} + +/** + * reset_ppn_array: Resets a PPN64 array to INVALID_PPN64 content + * + * @arr: Array to reset. + * @size: Array length. + */ +static inline void reset_ppn_array(PPN64 *arr, size_t size) +{ + size_t i; + + BUG_ON(!arr || size == 0); + + for (i = 0; i < size; ++i) + arr[i] = INVALID_PPN64; +} + +/** + * hypervisor_ppn_reset_all: Removes all mksGuestStat instance descriptors from + * the hypervisor. All related pages should be subsequently unpinned or freed. + * + */ +static inline void hypervisor_ppn_reset_all(void) +{ + unsigned long eax, ebx, ecx, edx, si = 0, di = 0; + + VMW_PORT(VMW_PORT_CMD_MKSGS_RESET, + 0, si, di, + 0, + VMW_HYPERVISOR_MAGIC, + eax, ebx, ecx, edx, si, di); +} + +/** + * hypervisor_ppn_add: Adds a single mksGuestStat instance descriptor to the + * hypervisor. Any related userspace pages should be pinned in advance. + * + * @pfn: Physical page number of the instance descriptor + */ +static inline void hypervisor_ppn_add(PPN64 pfn) +{ + unsigned long eax, ebx, ecx, edx, si = 0, di = 0; + + VMW_PORT(VMW_PORT_CMD_MKSGS_ADD_PPN, + (unsigned long)pfn, si, di, + 0, + VMW_HYPERVISOR_MAGIC, + eax, ebx, ecx, edx, si, di); +} + +/** + * hypervisor_ppn_remove: Removes a single mksGuestStat instance descriptor from + * the hypervisor. All related pages should be subsequently unpinned or freed. + * + * @pfn: Physical page number of the instance descriptor + */ +static inline void hypervisor_ppn_remove(PPN64 pfn) +{ + unsigned long eax, ebx, ecx, edx, si = 0, di = 0; + + VMW_PORT(VMW_PORT_CMD_MKSGS_REMOVE_PPN, + (unsigned long)pfn, si, di, + 0, + VMW_HYPERVISOR_MAGIC, + eax, ebx, ecx, edx, si, di); +} + +#if IS_ENABLED(CONFIG_DRM_VMWGFX_MKSSTATS) + +/* Order of the total number of pages used for kernel-internal mksGuestStat; at least 2 */ +#define MKSSTAT_KERNEL_PAGES_ORDER 2 +/* Header to the text description of mksGuestStat instance descriptor */ +#define MKSSTAT_KERNEL_DESCRIPTION "vmwgfx" + +/* Kernel mksGuestStats counter names and desciptions; same order as enum mksstat_kern_stats_t */ +static const char* const mksstat_kern_name_desc[MKSSTAT_KERN_COUNT][2] = +{ + { "vmw_execbuf_ioctl", "vmw_execbuf_ioctl" }, +}; + +/** + * mksstat_init_record: Initializes an MKSGuestStatCounter-based record + * for the respective mksGuestStat index. + * + * @stat_idx: Index of the MKSGuestStatCounter-based mksGuestStat record. + * @pstat: Pointer to array of MKSGuestStatCounterTime. + * @pinfo: Pointer to array of MKSGuestStatInfoEntry. + * @pstrs: Pointer to current end of the name/description sequence. + * Return: Pointer to the new end of the names/description sequence. + */ + +static inline char *mksstat_init_record(mksstat_kern_stats_t stat_idx, + MKSGuestStatCounterTime *pstat, MKSGuestStatInfoEntry *pinfo, char *pstrs) +{ + char *const pstrd = pstrs + strlen(mksstat_kern_name_desc[stat_idx][0]) + 1; + strcpy(pstrs, mksstat_kern_name_desc[stat_idx][0]); + strcpy(pstrd, mksstat_kern_name_desc[stat_idx][1]); + + pinfo[stat_idx].name.s = pstrs; + pinfo[stat_idx].description.s = pstrd; + pinfo[stat_idx].flags = MKS_GUEST_STAT_FLAG_NONE; + pinfo[stat_idx].stat.counter = (MKSGuestStatCounter *)&pstat[stat_idx]; + + return pstrd + strlen(mksstat_kern_name_desc[stat_idx][1]) + 1; +} + +/** + * mksstat_init_record_time: Initializes an MKSGuestStatCounterTime-based record + * for the respective mksGuestStat index. + * + * @stat_idx: Index of the MKSGuestStatCounterTime-based mksGuestStat record. + * @pstat: Pointer to array of MKSGuestStatCounterTime. + * @pinfo: Pointer to array of MKSGuestStatInfoEntry. + * @pstrs: Pointer to current end of the name/description sequence. + * Return: Pointer to the new end of the names/description sequence. + */ + +static inline char *mksstat_init_record_time(mksstat_kern_stats_t stat_idx, + MKSGuestStatCounterTime *pstat, MKSGuestStatInfoEntry *pinfo, char *pstrs) +{ + char *const pstrd = pstrs + strlen(mksstat_kern_name_desc[stat_idx][0]) + 1; + strcpy(pstrs, mksstat_kern_name_desc[stat_idx][0]); + strcpy(pstrd, mksstat_kern_name_desc[stat_idx][1]); + + pinfo[stat_idx].name.s = pstrs; + pinfo[stat_idx].description.s = pstrd; + pinfo[stat_idx].flags = MKS_GUEST_STAT_FLAG_TIME; + pinfo[stat_idx].stat.counterTime = &pstat[stat_idx]; + + return pstrd + strlen(mksstat_kern_name_desc[stat_idx][1]) + 1; +} + +/** + * mksstat_init_kern_id: Creates a single mksGuestStat instance descriptor and + * kernel-internal counters. Adds PFN mapping to the hypervisor. + * + * Create a single mksGuestStat instance descriptor and corresponding structures + * for all kernel-internal counters. The corresponding PFNs are mapped with the + * hypervisor. + * + * @ppage: Output pointer to page containing the instance descriptor. + * Return: Zero on success, negative error code on error. + */ + +static int mksstat_init_kern_id(struct page **ppage) +{ + MKSGuestStatInstanceDescriptor *pdesc; + MKSGuestStatCounterTime *pstat; + MKSGuestStatInfoEntry *pinfo; + char *pstrs, *pstrs_acc; + + /* Allocate pages for the kernel-internal instance descriptor */ + struct page *page = alloc_pages(GFP_KERNEL | __GFP_ZERO, MKSSTAT_KERNEL_PAGES_ORDER); + + if (!page) + return -ENOMEM; + + pdesc = page_address(page); + pstat = vmw_mksstat_get_kern_pstat(pdesc); + pinfo = vmw_mksstat_get_kern_pinfo(pdesc); + pstrs = vmw_mksstat_get_kern_pstrs(pdesc); + + /* Set up all kernel-internal counters and corresponding structures */ + pstrs_acc = pstrs; + pstrs_acc = mksstat_init_record_time(MKSSTAT_KERN_EXECBUF, pstat, pinfo, pstrs_acc); + + /* Add new counters above, in their order of appearance in mksstat_kern_stats_t */ + + BUG_ON(pstrs_acc - pstrs > PAGE_SIZE); + + /* Set up the kernel-internal instance descriptor */ + pdesc->reservedMBZ = 0; + pdesc->statStartVA = (uintptr_t)pstat; + pdesc->strsStartVA = (uintptr_t)pstrs; + pdesc->statLength = sizeof(*pstat) * MKSSTAT_KERN_COUNT; + pdesc->infoLength = sizeof(*pinfo) * MKSSTAT_KERN_COUNT; + pdesc->strsLength = pstrs_acc - pstrs; + snprintf(pdesc->description, ARRAY_SIZE(pdesc->description) - 1, "%s pid=%d", + MKSSTAT_KERNEL_DESCRIPTION, current->pid); + + pdesc->statPPNs[0] = page_to_pfn(virt_to_page(pstat)); + reset_ppn_array(pdesc->statPPNs + 1, ARRAY_SIZE(pdesc->statPPNs) - 1); + + pdesc->infoPPNs[0] = page_to_pfn(virt_to_page(pinfo)); + reset_ppn_array(pdesc->infoPPNs + 1, ARRAY_SIZE(pdesc->infoPPNs) - 1); + + pdesc->strsPPNs[0] = page_to_pfn(virt_to_page(pstrs)); + reset_ppn_array(pdesc->strsPPNs + 1, ARRAY_SIZE(pdesc->strsPPNs) - 1); + + *ppage = page; + + hypervisor_ppn_add((PPN64)page_to_pfn(page)); + + return 0; +} + +/** + * vmw_mksstat_get_kern_slot: Acquires a slot for a single kernel-internal + * mksGuestStat instance descriptor. + * + * Find a slot for a single kernel-internal mksGuestStat instance descriptor. + * In case no such was already present, allocate a new one and set up a kernel- + * internal mksGuestStat instance descriptor for the former. + * + * @pid: Process for which a slot is sought. + * @dev_priv: Identifies the drm private device. + * Return: Non-negative slot on success, negative error code on error. + */ + +int vmw_mksstat_get_kern_slot(pid_t pid, struct vmw_private *dev_priv) +{ + const size_t base = (u32)hash_32(pid, MKSSTAT_CAPACITY_LOG2); + size_t i; + + for (i = 0; i < ARRAY_SIZE(dev_priv->mksstat_kern_pids); ++i) { + const size_t slot = (i + base) % ARRAY_SIZE(dev_priv->mksstat_kern_pids); + + /* Check if an instance descriptor for this pid is already present */ + if (pid == (pid_t)atomic_read(&dev_priv->mksstat_kern_pids[slot])) + return (int)slot; + + /* Set up a new instance descriptor for this pid */ + if (!atomic_cmpxchg(&dev_priv->mksstat_kern_pids[slot], 0, MKSSTAT_PID_RESERVED)) { + const int ret = mksstat_init_kern_id(&dev_priv->mksstat_kern_pages[slot]); + + if (!ret) { + /* Reset top-timer tracking for this slot */ + dev_priv->mksstat_kern_top_timer[slot] = MKSSTAT_KERN_COUNT; + + atomic_set(&dev_priv->mksstat_kern_pids[slot], pid); + return (int)slot; + } + + atomic_set(&dev_priv->mksstat_kern_pids[slot], 0); + return ret; + } + } + + return -ENOSPC; +} + +#endif + +/** + * vmw_mksstat_cleanup_descriptor: Frees a single userspace-originating + * mksGuestStat instance-descriptor page and unpins all related user pages. + * + * Unpin all user pages realated to this instance descriptor and free + * the instance-descriptor page itself. + * + * @page: Page of the instance descriptor. + */ + +static void vmw_mksstat_cleanup_descriptor(struct page *page) +{ + MKSGuestStatInstanceDescriptor *pdesc = page_address(page); + size_t i; + + for (i = 0; i < ARRAY_SIZE(pdesc->statPPNs) && pdesc->statPPNs[i] != INVALID_PPN64; ++i) + unpin_user_page(pfn_to_page(pdesc->statPPNs[i])); + + for (i = 0; i < ARRAY_SIZE(pdesc->infoPPNs) && pdesc->infoPPNs[i] != INVALID_PPN64; ++i) + unpin_user_page(pfn_to_page(pdesc->infoPPNs[i])); + + for (i = 0; i < ARRAY_SIZE(pdesc->strsPPNs) && pdesc->strsPPNs[i] != INVALID_PPN64; ++i) + unpin_user_page(pfn_to_page(pdesc->strsPPNs[i])); + + __free_page(page); +} + +/** + * vmw_mksstat_remove_all: Resets all mksGuestStat instance descriptors + * from the hypervisor. + * + * Discard all hypervisor PFN mappings, containing active mksGuestState instance + * descriptors, unpin the related userspace pages and free the related kernel pages. + * + * @dev_priv: Identifies the drm private device. + * Return: Zero on success, negative error code on error. + */ + +int vmw_mksstat_remove_all(struct vmw_private *dev_priv) +{ + int ret = 0; + size_t i; + + /* Discard all PFN mappings with the hypervisor */ + hypervisor_ppn_reset_all(); + + /* Discard all userspace-originating instance descriptors and unpin all related pages */ + for (i = 0; i < ARRAY_SIZE(dev_priv->mksstat_user_pids); ++i) { + const pid_t pid0 = (pid_t)atomic_read(&dev_priv->mksstat_user_pids[i]); + + if (!pid0) + continue; + + if (pid0 != MKSSTAT_PID_RESERVED) { + const pid_t pid1 = atomic_cmpxchg(&dev_priv->mksstat_user_pids[i], pid0, MKSSTAT_PID_RESERVED); + + if (!pid1) + continue; + + if (pid1 == pid0) { + struct page *const page = dev_priv->mksstat_user_pages[i]; + + BUG_ON(!page); + + dev_priv->mksstat_user_pages[i] = NULL; + atomic_set(&dev_priv->mksstat_user_pids[i], 0); + + vmw_mksstat_cleanup_descriptor(page); + continue; + } + } + + ret = -EAGAIN; + } + +#if IS_ENABLED(CONFIG_DRM_VMWGFX_MKSSTATS) + /* Discard all kernel-internal instance descriptors and free all related pages */ + for (i = 0; i < ARRAY_SIZE(dev_priv->mksstat_kern_pids); ++i) { + const pid_t pid0 = (pid_t)atomic_read(&dev_priv->mksstat_kern_pids[i]); + + if (!pid0) + continue; + + if (pid0 != MKSSTAT_PID_RESERVED) { + const pid_t pid1 = atomic_cmpxchg(&dev_priv->mksstat_kern_pids[i], pid0, MKSSTAT_PID_RESERVED); + + if (!pid1) + continue; + + if (pid1 == pid0) { + struct page *const page = dev_priv->mksstat_kern_pages[i]; + + BUG_ON(!page); + + dev_priv->mksstat_kern_pages[i] = NULL; + atomic_set(&dev_priv->mksstat_kern_pids[i], 0); + + __free_pages(page, MKSSTAT_KERNEL_PAGES_ORDER); + continue; + } + } + + ret = -EAGAIN; + } + +#endif + return ret; +} + +/** + * vmw_mksstat_reset_ioctl: Resets all mksGuestStat instance descriptors + * from the hypervisor. + * + * Discard all hypervisor PFN mappings, containing active mksGuestStat instance + * descriptors, unpin the related userspace pages and free the related kernel pages. + * + * @dev: Identifies the drm device. + * @data: Pointer to the ioctl argument. + * @file_priv: Identifies the caller; unused. + * Return: Zero on success, negative error code on error. + */ + +int vmw_mksstat_reset_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct vmw_private *const dev_priv = vmw_priv(dev); + return vmw_mksstat_remove_all(dev_priv); +} + +/** + * vmw_mksstat_add_ioctl: Creates a single userspace-originating mksGuestStat + * instance descriptor and registers that with the hypervisor. + * + * Create a hypervisor PFN mapping, containing a single mksGuestStat instance + * descriptor and pin the corresponding userspace pages. + * + * @dev: Identifies the drm device. + * @data: Pointer to the ioctl argument. + * @file_priv: Identifies the caller; unused. + * Return: Zero on success, negative error code on error. + */ + +int vmw_mksstat_add_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_vmw_mksstat_add_arg *arg = + (struct drm_vmw_mksstat_add_arg *) data; + + struct vmw_private *const dev_priv = vmw_priv(dev); + + struct page *page; + MKSGuestStatInstanceDescriptor *pdesc; + const size_t num_pages_stat = PFN_UP(arg->stat_len); + const size_t num_pages_info = PFN_UP(arg->info_len); + const size_t num_pages_strs = PFN_UP(arg->strs_len); + long desc_len; + long nr_pinned_stat; + long nr_pinned_info; + long nr_pinned_strs; + struct page *pages_stat[ARRAY_SIZE(pdesc->statPPNs)]; + struct page *pages_info[ARRAY_SIZE(pdesc->infoPPNs)]; + struct page *pages_strs[ARRAY_SIZE(pdesc->strsPPNs)]; + size_t i, slot; + + arg->id = -1; + + if (!arg->stat || !arg->info || !arg->strs) + return -EINVAL; + + if (!arg->stat_len || !arg->info_len || !arg->strs_len) + return -EINVAL; + + if (!arg->description) + return -EINVAL; + + if (num_pages_stat > ARRAY_SIZE(pdesc->statPPNs) || + num_pages_info > ARRAY_SIZE(pdesc->infoPPNs) || + num_pages_strs > ARRAY_SIZE(pdesc->strsPPNs)) + return -EINVAL; + + /* Find an available slot in the mksGuestStats user array and reserve it */ + for (slot = 0; slot < ARRAY_SIZE(dev_priv->mksstat_user_pids); ++slot) + if (!atomic_cmpxchg(&dev_priv->mksstat_user_pids[slot], 0, MKSSTAT_PID_RESERVED)) + break; + + if (slot == ARRAY_SIZE(dev_priv->mksstat_user_pids)) + return -ENOSPC; + + BUG_ON(dev_priv->mksstat_user_pages[slot]); + + /* Allocate a page for the instance descriptor */ + page = alloc_page(GFP_KERNEL | __GFP_ZERO); + + if (!page) { + atomic_set(&dev_priv->mksstat_user_pids[slot], 0); + return -ENOMEM; + } + + /* Set up the instance descriptor */ + pdesc = page_address(page); + + pdesc->reservedMBZ = 0; + pdesc->statStartVA = arg->stat; + pdesc->strsStartVA = arg->strs; + pdesc->statLength = arg->stat_len; + pdesc->infoLength = arg->info_len; + pdesc->strsLength = arg->strs_len; + desc_len = strncpy_from_user(pdesc->description, u64_to_user_ptr(arg->description), + ARRAY_SIZE(pdesc->description) - 1); + + if (desc_len < 0) { + atomic_set(&dev_priv->mksstat_user_pids[slot], 0); + __free_page(page); + return -EFAULT; + } + + reset_ppn_array(pdesc->statPPNs, ARRAY_SIZE(pdesc->statPPNs)); + reset_ppn_array(pdesc->infoPPNs, ARRAY_SIZE(pdesc->infoPPNs)); + reset_ppn_array(pdesc->strsPPNs, ARRAY_SIZE(pdesc->strsPPNs)); + + /* Pin mksGuestStat user pages and store those in the instance descriptor */ + nr_pinned_stat = pin_user_pages_fast(arg->stat, num_pages_stat, FOLL_LONGTERM, pages_stat); + if (num_pages_stat != nr_pinned_stat) + goto err_pin_stat; + + for (i = 0; i < num_pages_stat; ++i) + pdesc->statPPNs[i] = page_to_pfn(pages_stat[i]); + + nr_pinned_info = pin_user_pages_fast(arg->info, num_pages_info, FOLL_LONGTERM, pages_info); + if (num_pages_info != nr_pinned_info) + goto err_pin_info; + + for (i = 0; i < num_pages_info; ++i) + pdesc->infoPPNs[i] = page_to_pfn(pages_info[i]); + + nr_pinned_strs = pin_user_pages_fast(arg->strs, num_pages_strs, FOLL_LONGTERM, pages_strs); + if (num_pages_strs != nr_pinned_strs) + goto err_pin_strs; + + for (i = 0; i < num_pages_strs; ++i) + pdesc->strsPPNs[i] = page_to_pfn(pages_strs[i]); + + /* Send the descriptor to the host via a hypervisor call. The mksGuestStat + pages will remain in use until the user requests a matching remove stats + or a stats reset occurs. */ + hypervisor_ppn_add((PPN64)page_to_pfn(page)); + + dev_priv->mksstat_user_pages[slot] = page; + atomic_set(&dev_priv->mksstat_user_pids[slot], task_pgrp_vnr(current)); + + arg->id = slot; + + DRM_DEV_INFO(dev->dev, "pid=%d arg.description='%.*s' id=%zu\n", current->pid, (int)desc_len, pdesc->description, slot); + + return 0; + +err_pin_strs: + if (nr_pinned_strs > 0) + unpin_user_pages(pages_strs, nr_pinned_strs); + +err_pin_info: + if (nr_pinned_info > 0) + unpin_user_pages(pages_info, nr_pinned_info); + +err_pin_stat: + if (nr_pinned_stat > 0) + unpin_user_pages(pages_stat, nr_pinned_stat); + + atomic_set(&dev_priv->mksstat_user_pids[slot], 0); + __free_page(page); + return -ENOMEM; +} + +/** + * vmw_mksstat_remove_ioctl: Removes a single userspace-originating mksGuestStat + * instance descriptor from the hypervisor. + * + * Discard a hypervisor PFN mapping, containing a single mksGuestStat instance + * descriptor and unpin the corresponding userspace pages. + * + * @dev: Identifies the drm device. + * @data: Pointer to the ioctl argument. + * @file_priv: Identifies the caller; unused. + * Return: Zero on success, negative error code on error. + */ + +int vmw_mksstat_remove_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_vmw_mksstat_remove_arg *arg = + (struct drm_vmw_mksstat_remove_arg *) data; + + struct vmw_private *const dev_priv = vmw_priv(dev); + + const size_t slot = arg->id; + pid_t pgid, pid; + + if (slot >= ARRAY_SIZE(dev_priv->mksstat_user_pids)) + return -EINVAL; + + DRM_DEV_INFO(dev->dev, "pid=%d arg.id=%zu\n", current->pid, slot); + + pgid = task_pgrp_vnr(current); + pid = atomic_cmpxchg(&dev_priv->mksstat_user_pids[slot], pgid, MKSSTAT_PID_RESERVED); + + if (!pid) + return 0; + + if (pid == pgid) { + struct page *const page = dev_priv->mksstat_user_pages[slot]; + + BUG_ON(!page); + + dev_priv->mksstat_user_pages[slot] = NULL; + atomic_set(&dev_priv->mksstat_user_pids[slot], 0); + + hypervisor_ppn_remove((PPN64)page_to_pfn(page)); + + vmw_mksstat_cleanup_descriptor(page); + return 0; + } + + return -EAGAIN; +} |