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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] [PATCH 7] MCA: simplify mce actoin, and some update of mem err handler for future SRAR extension
Jan and Keir,
Any comments?
Thanks
Jinsong
Liu, Jinsong wrote:
> MCA: simplify mce actoin, and some update of mem err handler for
> future SRAR extension
>
> This patch simplify mce_action(). Basically the 2 set of mce status
> flags MCA_... and MCER_... are highly functional similar. This patch
> remove the redundant middle-level flag MCA_..., and its related data
> structure and function, so that mce_action() logic is more clean and
> simpler.
> This patch also update mem err handler. intel_memerr_dhandler() will
> be commonly used by SRAO and SRAR, so for the extension of future
> SRAR case, this patch remove the default fail flag from
> intel_memerr_dhandler() outside to SRAO/SRAR level, since only
> SRAO/SRAR handler itself has the knowledge of how to handle the
> failure when mem err handler fail.
>
> Signed-off-by: Liu, Jinsong <jinsong.liu@xxxxxxxxx>
>
> diff -r e7cd79cd6626 xen/arch/x86/cpu/mcheck/mce_intel.c
> --- a/xen/arch/x86/cpu/mcheck/mce_intel.c Sun May 08 13:39:40 2011
> +0800 +++ b/xen/arch/x86/cpu/mcheck/mce_intel.c Sun May 08 18:15:13
> 2011 +0800 @@ -172,23 +172,14 @@ static unsigned int __read_mostly
> mce_dh static unsigned int __read_mostly mce_dhandler_num;
> static unsigned int __read_mostly mce_uhandler_num;
>
> -enum mce_result
> -{
> - MCER_NOERROR,
> - MCER_RECOVERED,
> - /* Not recoverd, but can continue */
> - MCER_CONTINUE,
> - MCER_RESET,
> -};
> -
> /* Maybe called in MCE context, no lock, no printk */
> static enum mce_result mce_action(struct cpu_user_regs *regs,
> mctelem_cookie_t mctc)
> {
> struct mc_info *local_mi;
> - enum mce_result ret = MCER_NOERROR;
> + enum mce_result bank_result = MCER_NOERROR;
> + enum mce_result worst_result = MCER_NOERROR;
> struct mcinfo_common *mic = NULL;
> - struct mca_handle_result mca_res;
> struct mca_binfo binfo;
> const struct mca_error_handler *handlers = mce_dhandlers;
> unsigned int i, handler_num = mce_dhandler_num;
> @@ -217,7 +208,7 @@ static enum mce_result mce_action(struct
> /* Processing bank information */
> x86_mcinfo_lookup(mic, local_mi, MC_TYPE_BANK);
>
> - for ( ; ret != MCER_RESET && mic && mic->size;
> + for ( ; bank_result != MCER_RESET && mic && mic->size;
> mic = x86_mcinfo_next(mic) )
> {
> if (mic->type != MC_TYPE_BANK) {
> @@ -225,34 +216,20 @@ static enum mce_result mce_action(struct
> }
> binfo.mib = (struct mcinfo_bank*)mic;
> binfo.bank = binfo.mib->mc_bank;
> - memset(&mca_res, 0x0f, sizeof(mca_res));
> + bank_result = MCER_NOERROR;
> for ( i = 0; i < handler_num; i++ ) {
> if (handlers[i].owned_error(binfo.mib->mc_status))
> {
> - handlers[i].recovery_handler(&binfo, &mca_res);
> -
> - if (mca_res.result & MCA_OWNER)
> - binfo.mib->mc_domid = mca_res.owner;
> -
> - if (mca_res.result == MCA_NEED_RESET)
> - ret = MCER_RESET;
> - else if (mca_res.result == MCA_RECOVERED)
> - {
> - if (ret < MCER_RECOVERED)
> - ret = MCER_RECOVERED;
> - }
> - else if (mca_res.result == MCA_NO_ACTION)
> - {
> - if (ret < MCER_CONTINUE)
> - ret = MCER_CONTINUE;
> - }
> + handlers[i].recovery_handler(&binfo, &bank_result);
> + if (worst_result < bank_result)
> + worst_result = bank_result;
> break;
> }
> }
> ASSERT(i != handler_num);
> }
>
> - return ret;
> + return worst_result;
> }
>
> /*
> @@ -608,7 +585,7 @@ struct mcinfo_recovery *mci_add_pageoff_
>
> static void intel_memerr_dhandler(
> struct mca_binfo *binfo,
> - struct mca_handle_result *result)
> + enum mce_result *result)
> {
> struct mcinfo_bank *bank = binfo->mib;
> struct mcinfo_global *global = binfo->mig;
> @@ -618,7 +595,6 @@ static void intel_memerr_dhandler(
> uint64_t mc_status, mc_misc;
>
> mce_printk(MCE_VERBOSE, "MCE: Enter UCR recovery action\n");
> - result->result = MCA_NEED_RESET;
>
> mc_status = bank->mc_status;
> mc_misc = bank->mc_misc;
> @@ -626,7 +602,6 @@ static void intel_memerr_dhandler(
> !(mc_status & MCi_STATUS_MISCV) ||
> ((mc_misc & MCi_MISC_ADDRMOD_MASK) != MCi_MISC_PHYSMOD) )
> {
> - result->result |= MCA_NO_ACTION;
> dprintk(XENLOG_WARNING,
> "No physical address provided for memory error\n");
> return;
> @@ -644,23 +619,19 @@ static void intel_memerr_dhandler(
>
> /* This is free page */
> if (status & PG_OFFLINE_OFFLINED)
> - result->result = MCA_RECOVERED;
> + *result = MCER_RECOVERED;
> else if (status & PG_OFFLINE_PENDING) {
> /* This page has owner */
> if (status & PG_OFFLINE_OWNED) {
> - result->result |= MCA_OWNER;
> - result->owner = status >> PG_OFFLINE_OWNER_SHIFT;
> + bank->mc_domid = status >> PG_OFFLINE_OWNER_SHIFT;
> mce_printk(MCE_QUIET, "MCE: This error page is ownded"
> - " by DOM %d\n", result->owner);
> - /* Fill vMCE# injection and vMCE# MSR virtualization "
> - * "related data */
> - bank->mc_domid = result->owner;
> + " by DOM %d\n", bank->mc_domid);
> /* XXX: Cannot handle shared pages yet
> * (this should identify all domains and gfn mapping to
> * the mfn in question) */
> - BUG_ON( result->owner == DOMID_COW );
> - if ( result->owner != DOMID_XEN ) {
> - d = get_domain_by_id(result->owner);
> + BUG_ON( bank->mc_domid == DOMID_COW );
> + if ( bank->mc_domid != DOMID_XEN ) {
> + d = get_domain_by_id(bank->mc_domid);
> ASSERT(d);
> gfn = get_gpfn_from_mfn((bank->mc_addr) >>
> PAGE_SHIFT);
>
> @@ -683,7 +654,7 @@ static void intel_memerr_dhandler(
> global->mc_gstatus) == -1 )
> {
> mce_printk(MCE_QUIET, "Fill vMCE# data for DOM%d
> " - "failed\n", result->owner);
> + "failed\n", bank->mc_domid);
> goto vmce_failed;
> }
>
> @@ -699,7 +670,7 @@ static void intel_memerr_dhandler(
> * For xen, it has contained the error and finished
> * its own recovery job.
> */
> - result->result = MCA_RECOVERED;
> + *result = MCER_RECOVERED;
> put_domain(d);
>
> return;
> @@ -718,11 +689,13 @@ static int intel_srao_check(uint64_t sta
>
> static void intel_srao_dhandler(
> struct mca_binfo *binfo,
> - struct mca_handle_result *result)
> + enum mce_result *result)
> {
> uint64_t status = binfo->mib->mc_status;
>
> /* For unknown srao error code, no action required */
> + *result = MCER_CONTINUE;
> +
> if ( status & MCi_STATUS_VAL )
> {
> switch ( status & INTEL_MCCOD_MASK )
> @@ -744,7 +717,7 @@ static int intel_default_check(uint64_t
>
> static void intel_default_mce_dhandler(
> struct mca_binfo *binfo,
> - struct mca_handle_result *result)
> + enum mce_result *result)
> {
> uint64_t status = binfo->mib->mc_status;
> enum intel_mce_type type;
> @@ -752,9 +725,9 @@ static void intel_default_mce_dhandler(
> type = intel_check_mce_type(status);
>
> if (type == intel_mce_fatal || type == intel_mce_ucr_srar)
> - result->result = MCA_NEED_RESET;
> - else if (type == intel_mce_ucr_srao)
> - result->result = MCA_NO_ACTION;
> + *result = MCER_RESET;
> + else
> + *result = MCER_CONTINUE;
> }
>
> static const struct mca_error_handler intel_mce_dhandlers[] = {
> @@ -764,7 +737,7 @@ static const struct mca_error_handler in
>
> static void intel_default_mce_uhandler(
> struct mca_binfo *binfo,
> - struct mca_handle_result *result)
> + enum mce_result *result)
> {
> uint64_t status = binfo->mib->mc_status;
> enum intel_mce_type type;
> @@ -776,10 +749,10 @@ static void intel_default_mce_uhandler(
> /* Panic if no handler for SRAR error */
> case intel_mce_ucr_srar:
> case intel_mce_fatal:
> - result->result = MCA_NEED_RESET;
> + *result = MCER_RESET;
> break;
> default:
> - result->result = MCA_NO_ACTION;
> + *result = MCER_CONTINUE;
> break;
> }
> }
> diff -r e7cd79cd6626 xen/arch/x86/cpu/mcheck/x86_mca.h
> --- a/xen/arch/x86/cpu/mcheck/x86_mca.h Sun May 08 13:39:40 2011 +0800
> +++ b/xen/arch/x86/cpu/mcheck/x86_mca.h Sun May 08 18:15:13 2011 +0800
> @@ -124,36 +124,6 @@ void mcabanks_free(struct mca_banks *ban
> void mcabanks_free(struct mca_banks *banks);
> extern struct mca_banks *mca_allbanks;
>
> -/* Below interfaces are defined for MCA internal processing:
> - * a. pre_handler will be called early in MCA ISR context, mainly
> for early
> - * need_reset detection for avoiding log missing. Also, it is
> used to judge
> - * impacted DOMAIN if possible.
> - * b. mca_error_handler is actually a (error_action_index,
> - * recovery_hanlder pointer) pair. The defined recovery_handler
> - * performs the actual recovery operations such as page_offline,
> cpu_offline
> - * in softIRQ context when the per_bank MCA error matching the
> corresponding
> - * mca_code index. If pre_handler can't judge the impacted domain,
> - * recovery_handler must figure it out.
> -*/
> -
> -/* MCA error has been recovered successfully by the recovery action*/
> -#define MCA_RECOVERED (0x1 << 0)
> -/* MCA error impact the specified DOMAIN in owner field below */
> -#define MCA_OWNER (0x1 << 1)
> -/* MCA error can't be recovered and need reset */
> -#define MCA_NEED_RESET (0x1 << 2)
> -/* MCA error did not have any action yet */
> -#define MCA_NO_ACTION (0x1 << 3)
> -
> -struct mca_handle_result
> -{
> - uint32_t result;
> - /* Used one result & MCA_OWNER */
> - domid_t owner;
> - /* Used by mca_error_handler, result & MCA_RECOVRED */
> - struct recovery_action *action;
> -};
> -
> /*Keep bank so that we can get staus even if mib is NULL */
> struct mca_binfo {
> int bank;
> @@ -163,8 +133,14 @@ struct mca_binfo {
> struct cpu_user_regs *regs;
> };
>
> -extern void (*mca_prehandler)( struct cpu_user_regs *regs,
> - struct mca_handle_result *result);
> +enum mce_result
> +{
> + MCER_NOERROR,
> + MCER_RECOVERED,
> + /* Not recoverd, but can continue */
> + MCER_CONTINUE,
> + MCER_RESET,
> +};
>
> struct mca_error_handler
> {
> @@ -175,7 +151,7 @@ struct mca_error_handler
> */
> int (*owned_error)(uint64_t status);
> void (*recovery_handler)(struct mca_binfo *binfo,
> - struct mca_handle_result *result);
> + enum mce_result *result);
> };
>
> /* Global variables */
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