--- /dev/null
+/* Copyright (C) 2010 - 2013 UNISYS CORPORATION
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for more
+ * details.
+ */
+
+#ifndef __CHANNEL_H__
+#define __CHANNEL_H__
+
+#include <linux/types.h>
+#include <linux/io.h>
+#include <linux/uuid.h>
+
+/*
+* Whenever this file is changed a corresponding change must be made in
+* the Console/ServicePart/visordiag_early/supervisor_channel.h file
+* which is needed for Linux kernel compiles. These two files must be
+* in sync.
+*/
+
+/* define the following to prevent include nesting in kernel header
+ * files of similar abbreviated content
+ */
+#define __SUPERVISOR_CHANNEL_H__
+
+#define SIGNATURE_16(A, B) ((A) | (B << 8))
+#define SIGNATURE_32(A, B, C, D) \
+ (SIGNATURE_16(A, B) | (SIGNATURE_16(C, D) << 16))
+#define SIGNATURE_64(A, B, C, D, E, F, G, H) \
+ (SIGNATURE_32(A, B, C, D) | ((u64)(SIGNATURE_32(E, F, G, H)) << 32))
+
+#ifndef lengthof
+#define lengthof(TYPE, MEMBER) (sizeof(((TYPE *)0)->MEMBER))
+#endif
+#ifndef COVERQ
+#define COVERQ(v, d) (((v) + (d) - 1) / (d))
+#endif
+#ifndef COVER
+#define COVER(v, d) ((d) * COVERQ(v, d))
+#endif
+
+#define ULTRA_CHANNEL_PROTOCOL_SIGNATURE SIGNATURE_32('E', 'C', 'N', 'L')
+
+enum channel_serverstate {
+ CHANNELSRV_UNINITIALIZED = 0, /* channel is in an undefined state */
+ CHANNELSRV_READY = 1 /* channel has been initialized by server */
+};
+
+enum channel_clientstate {
+ CHANNELCLI_DETACHED = 0,
+ CHANNELCLI_DISABLED = 1, /* client can see channel but is NOT
+ * allowed to use it unless given TBD
+ * explicit request (should actually be
+ * < DETACHED) */
+ CHANNELCLI_ATTACHING = 2, /* legacy EFI client request
+ * for EFI server to attach */
+ CHANNELCLI_ATTACHED = 3, /* idle, but client may want
+ * to use channel any time */
+ CHANNELCLI_BUSY = 4, /* client either wants to use or is
+ * using channel */
+ CHANNELCLI_OWNED = 5 /* "no worries" state - client can
+ * access channel anytime */
+};
+
+static inline const u8 *
+ULTRA_CHANNELCLI_STRING(u32 v)
+{
+ switch (v) {
+ case CHANNELCLI_DETACHED:
+ return (const u8 *)("DETACHED");
+ case CHANNELCLI_DISABLED:
+ return (const u8 *)("DISABLED");
+ case CHANNELCLI_ATTACHING:
+ return (const u8 *)("ATTACHING");
+ case CHANNELCLI_ATTACHED:
+ return (const u8 *)("ATTACHED");
+ case CHANNELCLI_BUSY:
+ return (const u8 *)("BUSY");
+ case CHANNELCLI_OWNED:
+ return (const u8 *)("OWNED");
+ default:
+ break;
+ }
+ return (const u8 *)("?");
+}
+
+#define SPAR_CHANNEL_SERVER_READY(ch) \
+ (readl(&(ch)->srv_state) == CHANNELSRV_READY)
+
+#define ULTRA_VALID_CHANNELCLI_TRANSITION(o, n) \
+ (((((o) == CHANNELCLI_DETACHED) && ((n) == CHANNELCLI_DISABLED)) || \
+ (((o) == CHANNELCLI_ATTACHING) && ((n) == CHANNELCLI_DISABLED)) || \
+ (((o) == CHANNELCLI_ATTACHED) && ((n) == CHANNELCLI_DISABLED)) || \
+ (((o) == CHANNELCLI_ATTACHING) && ((n) == CHANNELCLI_DETACHED)) || \
+ (((o) == CHANNELCLI_ATTACHED) && ((n) == CHANNELCLI_DETACHED)) || \
+ (((o) == CHANNELCLI_DETACHED) && ((n) == CHANNELCLI_ATTACHING)) || \
+ (((o) == CHANNELCLI_ATTACHING) && ((n) == CHANNELCLI_ATTACHED)) || \
+ (((o) == CHANNELCLI_DETACHED) && ((n) == CHANNELCLI_ATTACHED)) || \
+ (((o) == CHANNELCLI_BUSY) && ((n) == CHANNELCLI_ATTACHED)) || \
+ (((o) == CHANNELCLI_ATTACHED) && ((n) == CHANNELCLI_BUSY)) || \
+ (((o) == CHANNELCLI_DETACHED) && ((n) == CHANNELCLI_OWNED)) || \
+ (((o) == CHANNELCLI_DISABLED) && ((n) == CHANNELCLI_OWNED)) || \
+ (((o) == CHANNELCLI_ATTACHING) && ((n) == CHANNELCLI_OWNED)) || \
+ (((o) == CHANNELCLI_ATTACHED) && ((n) == CHANNELCLI_OWNED)) || \
+ (((o) == CHANNELCLI_BUSY) && ((n) == CHANNELCLI_OWNED)) || (0)) \
+ ? (1) : (0))
+
+/* Values for ULTRA_CHANNEL_PROTOCOL.CliErrorBoot: */
+/* throttling invalid boot channel statetransition error due to client
+ * disabled */
+#define ULTRA_CLIERRORBOOT_THROTTLEMSG_DISABLED 0x01
+
+/* throttling invalid boot channel statetransition error due to client
+ * not attached */
+#define ULTRA_CLIERRORBOOT_THROTTLEMSG_NOTATTACHED 0x02
+
+/* throttling invalid boot channel statetransition error due to busy channel */
+#define ULTRA_CLIERRORBOOT_THROTTLEMSG_BUSY 0x04
+
+/* Values for ULTRA_CHANNEL_PROTOCOL.CliErrorOS: */
+/* throttling invalid guest OS channel statetransition error due to
+ * client disabled */
+#define ULTRA_CLIERROROS_THROTTLEMSG_DISABLED 0x01
+
+/* throttling invalid guest OS channel statetransition error due to
+ * client not attached */
+#define ULTRA_CLIERROROS_THROTTLEMSG_NOTATTACHED 0x02
+
+/* throttling invalid guest OS channel statetransition error due to
+ * busy channel */
+#define ULTRA_CLIERROROS_THROTTLEMSG_BUSY 0x04
+
+/* Values for ULTRA_CHANNEL_PROTOCOL.Features: This define exists so
+* that windows guest can look at the FeatureFlags in the io channel,
+* and configure the windows driver to use interrupts or not based on
+* this setting. This flag is set in uislib after the
+* ULTRA_VHBA_init_channel is called. All feature bits for all
+* channels should be defined here. The io channel feature bits are
+* defined right here */
+#define ULTRA_IO_DRIVER_ENABLES_INTS (0x1ULL << 1)
+#define ULTRA_IO_CHANNEL_IS_POLLING (0x1ULL << 3)
+#define ULTRA_IO_IOVM_IS_OK_WITH_DRIVER_DISABLING_INTS (0x1ULL << 4)
+#define ULTRA_IO_DRIVER_DISABLES_INTS (0x1ULL << 5)
+#define ULTRA_IO_DRIVER_SUPPORTS_ENHANCED_RCVBUF_CHECKING (0x1ULL << 6)
+
+/* Common Channel Header */
+struct channel_header {
+ u64 signature; /* Signature */
+ u32 legacy_state; /* DEPRECATED - being replaced by */
+ /* / SrvState, CliStateBoot, and CliStateOS below */
+ u32 header_size; /* sizeof(struct channel_header) */
+ u64 size; /* Total size of this channel in bytes */
+ u64 features; /* Flags to modify behavior */
+ uuid_le chtype; /* Channel type: data, bus, control, etc. */
+ u64 partition_handle; /* ID of guest partition */
+ u64 handle; /* Device number of this channel in client */
+ u64 ch_space_offset; /* Offset in bytes to channel specific area */
+ u32 version_id; /* struct channel_header Version ID */
+ u32 partition_index; /* Index of guest partition */
+ uuid_le zone_uuid; /* Guid of Channel's zone */
+ u32 cli_str_offset; /* offset from channel header to
+ * nul-terminated ClientString (0 if
+ * ClientString not present) */
+ u32 cli_state_boot; /* CHANNEL_CLIENTSTATE of pre-boot
+ * EFI client of this channel */
+ u32 cmd_state_cli; /* CHANNEL_COMMANDSTATE (overloaded in
+ * Windows drivers, see ServerStateUp,
+ * ServerStateDown, etc) */
+ u32 cli_state_os; /* CHANNEL_CLIENTSTATE of Guest OS
+ * client of this channel */
+ u32 ch_characteristic; /* CHANNEL_CHARACTERISTIC_<xxx> */
+ u32 cmd_state_srv; /* CHANNEL_COMMANDSTATE (overloaded in
+ * Windows drivers, see ServerStateUp,
+ * ServerStateDown, etc) */
+ u32 srv_state; /* CHANNEL_SERVERSTATE */
+ u8 cli_error_boot; /* bits to indicate err states for
+ * boot clients, so err messages can
+ * be throttled */
+ u8 cli_error_os; /* bits to indicate err states for OS
+ * clients, so err messages can be
+ * throttled */
+ u8 filler[1]; /* Pad out to 128 byte cacheline */
+ /* Please add all new single-byte values below here */
+ u8 recover_channel;
+} __packed;
+
+#define ULTRA_CHANNEL_ENABLE_INTS (0x1ULL << 0)
+
+/* Subheader for the Signal Type variation of the Common Channel */
+struct signal_queue_header {
+ /* 1st cache line */
+ u32 version; /* SIGNAL_QUEUE_HEADER Version ID */
+ u32 chtype; /* Queue type: storage, network */
+ u64 size; /* Total size of this queue in bytes */
+ u64 sig_base_offset; /* Offset to signal queue area */
+ u64 features; /* Flags to modify behavior */
+ u64 num_sent; /* Total # of signals placed in this queue */
+ u64 num_overflows; /* Total # of inserts failed due to
+ * full queue */
+ u32 signal_size; /* Total size of a signal for this queue */
+ u32 max_slots; /* Max # of slots in queue, 1 slot is
+ * always empty */
+ u32 max_signals; /* Max # of signals in queue
+ * (MaxSignalSlots-1) */
+ u32 head; /* Queue head signal # */
+ /* 2nd cache line */
+ u64 num_received; /* Total # of signals removed from this queue */
+ u32 tail; /* Queue tail signal # (on separate
+ * cache line) */
+ u32 reserved1; /* Reserved field */
+ u64 reserved2; /* Reserved field */
+ u64 client_queue;
+ u64 num_irq_received; /* Total # of Interrupts received. This
+ * is incremented by the ISR in the
+ * guest windows driver */
+ u64 num_empty; /* Number of times that visor_signal_remove
+ * is called and returned Empty
+ * Status. */
+ u32 errorflags; /* Error bits set during SignalReinit
+ * to denote trouble with client's
+ * fields */
+ u8 filler[12]; /* Pad out to 64 byte cacheline */
+} __packed;
+
+#define spar_signal_init(chan, QHDRFLD, QDATAFLD, QDATATYPE, ver, typ) \
+ do { \
+ memset(&chan->QHDRFLD, 0, sizeof(chan->QHDRFLD)); \
+ chan->QHDRFLD.version = ver; \
+ chan->QHDRFLD.chtype = typ; \
+ chan->QHDRFLD.size = sizeof(chan->QDATAFLD); \
+ chan->QHDRFLD.signal_size = sizeof(QDATATYPE); \
+ chan->QHDRFLD.sig_base_offset = (u64)(chan->QDATAFLD) - \
+ (u64)(&chan->QHDRFLD); \
+ chan->QHDRFLD.max_slots = \
+ sizeof(chan->QDATAFLD) / sizeof(QDATATYPE); \
+ chan->QHDRFLD.max_signals = chan->QHDRFLD.max_slots - 1;\
+ } while (0)
+
+/* Generic function useful for validating any type of channel when it is
+ * received by the client that will be accessing the channel.
+ * Note that <logCtx> is only needed for callers in the EFI environment, and
+ * is used to pass the EFI_DIAG_CAPTURE_PROTOCOL needed to log messages.
+ */
+static inline int
+spar_check_channel_client(void __iomem *ch,
+ uuid_le expected_uuid,
+ char *chname,
+ u64 expected_min_bytes,
+ u32 expected_version,
+ u64 expected_signature)
+{
+ if (uuid_le_cmp(expected_uuid, NULL_UUID_LE) != 0) {
+ uuid_le guid;
+
+ memcpy_fromio(&guid,
+ &((struct channel_header __iomem *)(ch))->chtype,
+ sizeof(guid));
+ /* caller wants us to verify type GUID */
+ if (uuid_le_cmp(guid, expected_uuid) != 0) {
+ pr_err("Channel mismatch on channel=%s(%pUL) field=type expected=%pUL actual=%pUL\n",
+ chname, &expected_uuid,
+ &expected_uuid, &guid);
+ return 0;
+ }
+ }
+ if (expected_min_bytes > 0) { /* caller wants us to verify
+ * channel size */
+ unsigned long long bytes =
+ readq(&((struct channel_header __iomem *)
+ (ch))->size);
+ if (bytes < expected_min_bytes) {
+ pr_err("Channel mismatch on channel=%s(%pUL) field=size expected=0x%-8.8Lx actual=0x%-8.8Lx\n",
+ chname, &expected_uuid,
+ (unsigned long long)expected_min_bytes, bytes);
+ return 0;
+ }
+ }
+ if (expected_version > 0) { /* caller wants us to verify
+ * channel version */
+ unsigned long ver = readl(&((struct channel_header __iomem *)
+ (ch))->version_id);
+ if (ver != expected_version) {
+ pr_err("Channel mismatch on channel=%s(%pUL) field=version expected=0x%-8.8lx actual=0x%-8.8lx\n",
+ chname, &expected_uuid,
+ (unsigned long)expected_version, ver);
+ return 0;
+ }
+ }
+ if (expected_signature > 0) { /* caller wants us to verify
+ * channel signature */
+ unsigned long long sig =
+ readq(&((struct channel_header __iomem *)
+ (ch))->signature);
+ if (sig != expected_signature) {
+ pr_err("Channel mismatch on channel=%s(%pUL) field=signature expected=0x%-8.8llx actual=0x%-8.8llx\n",
+ chname, &expected_uuid,
+ expected_signature, sig);
+ return 0;
+ }
+ }
+ return 1;
+}
+
+/* Generic function useful for validating any type of channel when it is about
+ * to be initialized by the server of the channel.
+ * Note that <logCtx> is only needed for callers in the EFI environment, and
+ * is used to pass the EFI_DIAG_CAPTURE_PROTOCOL needed to log messages.
+ */
+static inline int spar_check_channel_server(uuid_le typeuuid, char *name,
+ u64 expected_min_bytes,
+ u64 actual_bytes)
+{
+ if (expected_min_bytes > 0) /* caller wants us to verify
+ * channel size */
+ if (actual_bytes < expected_min_bytes) {
+ pr_err("Channel mismatch on channel=%s(%pUL) field=size expected=0x%-8.8llx actual=0x%-8.8llx\n",
+ name, &typeuuid, expected_min_bytes,
+ actual_bytes);
+ return 0;
+ }
+ return 1;
+}
+
+/* Given a file pathname <s> (with '/' or '\' separating directory nodes),
+ * returns a pointer to the beginning of a node within that pathname such
+ * that the number of nodes from that pointer to the end of the string is
+ * NOT more than <n>. Note that if the pathname has less than <n> nodes
+ * in it, the return pointer will be to the beginning of the string.
+ */
+static inline u8 *
+pathname_last_n_nodes(u8 *s, unsigned int n)
+{
+ u8 *p = s;
+ unsigned int node_count = 0;
+
+ while (*p != '\0') {
+ if ((*p == '/') || (*p == '\\'))
+ node_count++;
+ p++;
+ }
+ if (node_count <= n)
+ return s;
+ while (n > 0) {
+ p--;
+ if (p == s)
+ break; /* should never happen, unless someone
+ * is changing the string while we are
+ * looking at it!! */
+ if ((*p == '/') || (*p == '\\'))
+ n--;
+ }
+ return p + 1;
+}
+
+static inline int
+spar_channel_client_acquire_os(void __iomem *ch, u8 *id)
+{
+ struct channel_header __iomem *hdr = ch;
+
+ if (readl(&hdr->cli_state_os) == CHANNELCLI_DISABLED) {
+ if ((readb(&hdr->cli_error_os)
+ & ULTRA_CLIERROROS_THROTTLEMSG_DISABLED) == 0) {
+ /* we are NOT throttling this message */
+ writeb(readb(&hdr->cli_error_os) |
+ ULTRA_CLIERROROS_THROTTLEMSG_DISABLED,
+ &hdr->cli_error_os);
+ /* throttle until acquire successful */
+
+ pr_info("%s Channel StateTransition INVALID! - acquire failed because OS client DISABLED\n",
+ id);
+ }
+ return 0;
+ }
+ if ((readl(&hdr->cli_state_os) != CHANNELCLI_OWNED) &&
+ (readl(&hdr->cli_state_boot) == CHANNELCLI_DISABLED)) {
+ /* Our competitor is DISABLED, so we can transition to OWNED */
+ pr_info("%s Channel StateTransition (%s) %s(%d)-->%s(%d)\n",
+ id, "cli_state_os",
+ ULTRA_CHANNELCLI_STRING(readl(&hdr->cli_state_os)),
+ readl(&hdr->cli_state_os),
+ ULTRA_CHANNELCLI_STRING(CHANNELCLI_OWNED),
+ CHANNELCLI_OWNED);
+ writel(CHANNELCLI_OWNED, &hdr->cli_state_os);
+ mb(); /* required for channel synch */
+ }
+ if (readl(&hdr->cli_state_os) == CHANNELCLI_OWNED) {
+ if (readb(&hdr->cli_error_os) != 0) {
+ /* we are in an error msg throttling state;
+ * come out of it */
+ pr_info("%s Channel OS client acquire now successful\n",
+ id);
+ writeb(0, &hdr->cli_error_os);
+ }
+ return 1;
+ }
+
+ /* We have to do it the "hard way". We transition to BUSY,
+ * and can use the channel iff our competitor has not also
+ * transitioned to BUSY. */
+ if (readl(&hdr->cli_state_os) != CHANNELCLI_ATTACHED) {
+ if ((readb(&hdr->cli_error_os)
+ & ULTRA_CLIERROROS_THROTTLEMSG_NOTATTACHED) == 0) {
+ /* we are NOT throttling this message */
+ writeb(readb(&hdr->cli_error_os) |
+ ULTRA_CLIERROROS_THROTTLEMSG_NOTATTACHED,
+ &hdr->cli_error_os);
+ /* throttle until acquire successful */
+ pr_info("%s Channel StateTransition INVALID! - acquire failed because OS client NOT ATTACHED (state=%s(%d))\n",
+ id, ULTRA_CHANNELCLI_STRING(
+ readl(&hdr->cli_state_os)),
+ readl(&hdr->cli_state_os));
+ }
+ return 0;
+ }
+ writel(CHANNELCLI_BUSY, &hdr->cli_state_os);
+ mb(); /* required for channel synch */
+ if (readl(&hdr->cli_state_boot) == CHANNELCLI_BUSY) {
+ if ((readb(&hdr->cli_error_os)
+ & ULTRA_CLIERROROS_THROTTLEMSG_BUSY) == 0) {
+ /* we are NOT throttling this message */
+ writeb(readb(&hdr->cli_error_os) |
+ ULTRA_CLIERROROS_THROTTLEMSG_BUSY,
+ &hdr->cli_error_os);
+ /* throttle until acquire successful */
+ pr_info("%s Channel StateTransition failed - host OS acquire failed because boot BUSY\n",
+ id);
+ }
+ /* reset busy */
+ writel(CHANNELCLI_ATTACHED, &hdr->cli_state_os);
+ mb(); /* required for channel synch */
+ return 0;
+ }
+ if (readb(&hdr->cli_error_os) != 0) {
+ /* we are in an error msg throttling state; come out of it */
+ pr_info("%s Channel OS client acquire now successful\n", id);
+ writeb(0, &hdr->cli_error_os);
+ }
+ return 1;
+}
+
+static inline void
+spar_channel_client_release_os(void __iomem *ch, u8 *id)
+{
+ struct channel_header __iomem *hdr = ch;
+
+ if (readb(&hdr->cli_error_os) != 0) {
+ /* we are in an error msg throttling state; come out of it */
+ pr_info("%s Channel OS client error state cleared\n", id);
+ writeb(0, &hdr->cli_error_os);
+ }
+ if (readl(&hdr->cli_state_os) == CHANNELCLI_OWNED)
+ return;
+ if (readl(&hdr->cli_state_os) != CHANNELCLI_BUSY) {
+ pr_info("%s Channel StateTransition INVALID! - release failed because OS client NOT BUSY (state=%s(%d))\n",
+ id, ULTRA_CHANNELCLI_STRING(
+ readl(&hdr->cli_state_os)),
+ readl(&hdr->cli_state_os));
+ /* return; */
+ }
+ writel(CHANNELCLI_ATTACHED, &hdr->cli_state_os); /* release busy */
+}
+
+/*
+* Routine Description:
+* Tries to insert the prebuilt signal pointed to by pSignal into the nth
+* Queue of the Channel pointed to by pChannel
+*
+* Parameters:
+* pChannel: (IN) points to the IO Channel
+* Queue: (IN) nth Queue of the IO Channel
+* pSignal: (IN) pointer to the signal
+*
+* Assumptions:
+* - pChannel, Queue and pSignal are valid.
+* - If insertion fails due to a full queue, the caller will determine the
+* retry policy (e.g. wait & try again, report an error, etc.).
+*
+* Return value: 1 if the insertion succeeds, 0 if the queue was
+* full.
+*/
+
+unsigned char spar_signal_insert(struct channel_header __iomem *ch, u32 queue,
+ void *sig);
+
+/*
+* Routine Description:
+* Removes one signal from Channel pChannel's nth Queue at the
+* time of the call and copies it into the memory pointed to by
+* pSignal.
+*
+* Parameters:
+* pChannel: (IN) points to the IO Channel
+* Queue: (IN) nth Queue of the IO Channel
+* pSignal: (IN) pointer to where the signals are to be copied
+*
+* Assumptions:
+* - pChannel and Queue are valid.
+* - pSignal points to a memory area large enough to hold queue's SignalSize
+*
+* Return value: 1 if the removal succeeds, 0 if the queue was
+* empty.
+*/
+
+unsigned char spar_signal_remove(struct channel_header __iomem *ch, u32 queue,
+ void *sig);
+
+/*
+* Routine Description:
+* Removes all signals present in Channel pChannel's nth Queue at the
+* time of the call and copies them into the memory pointed to by
+* pSignal. Returns the # of signals copied as the value of the routine.
+*
+* Parameters:
+* pChannel: (IN) points to the IO Channel
+* Queue: (IN) nth Queue of the IO Channel
+* pSignal: (IN) pointer to where the signals are to be copied
+*
+* Assumptions:
+* - pChannel and Queue are valid.
+* - pSignal points to a memory area large enough to hold Queue's MaxSignals
+* # of signals, each of which is Queue's SignalSize.
+*
+* Return value:
+* # of signals copied.
+*/
+unsigned int spar_signal_remove_all(struct channel_header *ch, u32 queue,
+ void *sig);
+
+/*
+* Routine Description:
+* Determine whether a signal queue is empty.
+*
+* Parameters:
+* pChannel: (IN) points to the IO Channel
+* Queue: (IN) nth Queue of the IO Channel
+*
+* Return value:
+* 1 if the signal queue is empty, 0 otherwise.
+*/
+unsigned char spar_signalqueue_empty(struct channel_header __iomem *ch,
+ u32 queue);
+
+#endif
Code Review / kvmfornfv.git / blobdiff