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[undi] Profile all PXE API calls

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2014-05-03 13:35:50 +01:00
parent 206bd7bb64
commit 50689a8974
1 changed files with 97 additions and 6 deletions
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103
src/arch/i386/interface/pxeparent/pxeparent.c
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@ -20,6 +20,7 @@
FILE_LICENCE ( GPL2_OR_LATER );
#include <ipxe/dhcp.h>
#include <ipxe/profile.h>
#include <pxeparent.h>
#include <pxe_api.h>
#include <pxe_types.h>
@ -37,6 +38,59 @@ FILE_LICENCE ( GPL2_OR_LATER );
"External PXE API error" )
#define EPXECALL( status ) EPLATFORM ( EINFO_EPXECALL, status )
/** A parent PXE API call profiler */
struct pxeparent_profiler {
/** Total time spent performing REAL_CALL() */
struct profiler total;
/** Time spent transitioning to real mode */
struct profiler p2r;
/** Time spent in external code */
struct profiler ext;
/** Time spent transitioning back to protected mode */
struct profiler r2p;
};
/** PXENV_UNDI_TRANSMIT profiler */
static struct pxeparent_profiler pxeparent_tx_profiler __profiler = {
{ .name = "pxeparent.tx" },
{ .name = "pxeparent.tx_p2r" },
{ .name = "pxeparent.tx_ext" },
{ .name = "pxeparent.tx_r2p" },
};
/** PXENV_UNDI_ISR profiler
*
* Note that this profiler will not see calls to
* PXENV_UNDI_ISR_IN_START, which are handled by the UNDI ISR and do
* not go via pxeparent_call().
*/
static struct pxeparent_profiler pxeparent_isr_profiler __profiler = {
{ .name = "pxeparent.isr" },
{ .name = "pxeparent.isr_p2r" },
{ .name = "pxeparent.isr_ext" },
{ .name = "pxeparent.isr_r2p" },
};
/** PXE unknown API call profiler
*
* This profiler can be used to measure the overhead of a dummy PXE
* API call.
*/
static struct pxeparent_profiler pxeparent_unknown_profiler __profiler = {
{ .name = "pxeparent.unknown" },
{ .name = "pxeparent.unknown_p2r" },
{ .name = "pxeparent.unknown_ext" },
{ .name = "pxeparent.unknown_r2p" },
};
/** Miscellaneous PXE API call profiler */
static struct pxeparent_profiler pxeparent_misc_profiler __profiler = {
{ .name = "pxeparent.misc" },
{ .name = "pxeparent.misc_p2r" },
{ .name = "pxeparent.misc_ext" },
{ .name = "pxeparent.misc_r2p" },
};
/**
* Name PXE API call
*
@ -103,11 +157,32 @@ pxeparent_function_name ( unsigned int function ) {
}
}
/**
* Determine applicable profiler pair (for debugging)
*
* @v function API call number
* @ret profiler Profiler
*/
static struct pxeparent_profiler * pxeparent_profiler ( unsigned int function ){
/* Determine applicable profiler */
switch ( function ) {
case PXENV_UNDI_TRANSMIT:
return &pxeparent_tx_profiler;
case PXENV_UNDI_ISR:
return &pxeparent_isr_profiler;
case PXENV_UNKNOWN:
return &pxeparent_unknown_profiler;
default:
return &pxeparent_misc_profiler;
}
}
/**
* PXE parent parameter block
*
* Used as the paramter block for all parent PXE API calls. Resides in base
* memory.
* Used as the parameter block for all parent PXE API calls. Resides
* in base memory.
*/
static union u_PXENV_ANY __bss16 ( pxeparent_params );
#define pxeparent_params __use_data16 ( pxeparent_params )
@ -131,8 +206,11 @@ SEGOFF16_t __bss16 ( pxeparent_entry_point );
*/
int pxeparent_call ( SEGOFF16_t entry, unsigned int function,
void *params, size_t params_len ) {
struct pxeparent_profiler *profiler = pxeparent_profiler ( function );
PXENV_EXIT_t exit;
int discard_b, discard_D;
unsigned long started;
unsigned long stopped;
int discard_D;
int rc;
/* Copy parameter block and entry point */
@ -143,18 +221,31 @@ int pxeparent_call ( SEGOFF16_t entry, unsigned int function,
/* Call real-mode entry point. This calling convention will
* work with both the !PXE and the PXENV+ entry points.
*/
profile_start ( &profiler->total );
__asm__ __volatile__ ( REAL_CODE ( "pushl %%ebp\n\t" /* gcc bug */
"rdtsc\n\t"
"pushl %%eax\n\t"
"pushw %%es\n\t"
"pushw %%di\n\t"
"pushw %%bx\n\t"
"lcall *pxeparent_entry_point\n\t"
"movw %%ax, %%bx\n\t"
"rdtsc\n\t"
"addw $6, %%sp\n\t"
"popl %%edx\n\t"
"popl %%ebp\n\t" /* gcc bug */ )
: "=a" ( exit ), "=b" ( discard_b ),
"=D" ( discard_D )
: "=a" ( stopped ), "=d" ( started ),
"=b" ( exit ), "=D" ( discard_D )
: "b" ( function ),
"D" ( __from_data16 ( &pxeparent_params ) )
: "ecx", "edx", "esi" );
: "ecx", "esi" );
profile_stop ( &profiler->total );
profile_start_at ( &profiler->p2r, profiler->total.started );
profile_stop_at ( &profiler->p2r, started );
profile_start_at ( &profiler->ext, started );
profile_stop_at ( &profiler->ext, stopped );
profile_start_at ( &profiler->r2p, stopped );
profile_stop_at ( &profiler->r2p, profiler->total.stopped );
/* Determine return status code based on PXENV_EXIT and
* PXENV_STATUS