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[phantom] Add line count limit to phantom_dmesg()

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The Phantom firmware debug logs can be extremely long, so add the
ability to restrict the output to the last N lines.
This commit is contained in:
Michael Brown 2008-10-24 21:41:58 +01:00
parent 7a4c129af7
commit df033de24f
1 changed files with 57 additions and 22 deletions
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79
src/drivers/net/phantom/phantom.c
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@ -394,8 +394,9 @@ static inline void phantom_write_hilo ( struct phantom_nic *phantom,
* @v buf 8-byte buffer to fill
* @ret rc Return status code
*/
static int phantom_read_test_mem ( struct phantom_nic *phantom,
uint64_t offset, uint32_t buf[2] ) {
static int phantom_read_test_mem_block ( struct phantom_nic *phantom,
unsigned long offset,
uint32_t buf[2] ) {
unsigned int retries;
uint32_t test_control;
@ -421,29 +422,58 @@ static int phantom_read_test_mem ( struct phantom_nic *phantom,
return -ETIMEDOUT;
}
/**
* Read single byte from Phantom test memory
*
* @v phantom Phantom NIC
* @v offset Offset within test memory
* @ret byte Byte read, or negative error
*/
static int phantom_read_test_mem ( struct phantom_nic *phantom,
unsigned long offset ) {
static union {
uint8_t bytes[8];
uint32_t dwords[2];
} cache;
static unsigned long cache_offset = -1UL;
unsigned long sub_offset;
int rc;
sub_offset = ( offset & ( sizeof ( cache ) - 1 ) );
offset = ( offset & ~( sizeof ( cache ) - 1 ) );
if ( cache_offset != offset ) {
if ( ( rc = phantom_read_test_mem_block ( phantom, offset,
cache.dwords )) !=0 )
return rc;
cache_offset = offset;
}
return cache.bytes[sub_offset];
}
/**
* Dump Phantom firmware dmesg log
*
* @v phantom Phantom NIC
* @v log Log number
* @v max_lines Maximum number of lines to show, or -1 to show all
* @ret rc Return status code
*/
static void phantom_dmesg ( struct phantom_nic *phantom, unsigned int log ) {
static int phantom_dmesg ( struct phantom_nic *phantom, unsigned int log,
unsigned int max_lines ) {
uint32_t head;
uint32_t tail;
uint32_t len;
uint32_t sig;
uint32_t offset;
union {
uint8_t bytes[8];
uint32_t dwords[2];
} buf;
unsigned int i;
int rc;
int byte;
/* Optimise out for non-debug builds */
if ( ! DBG_LOG )
return;
return 0;
/* Locate log */
head = phantom_readl ( phantom, UNM_CAM_RAM_DMESG_HEAD ( log ) );
len = phantom_readl ( phantom, UNM_CAM_RAM_DMESG_LEN ( log ) );
tail = phantom_readl ( phantom, UNM_CAM_RAM_DMESG_TAIL ( log ) );
@ -456,32 +486,37 @@ static void phantom_dmesg ( struct phantom_nic *phantom, unsigned int log ) {
sig, UNM_CAM_RAM_DMESG_SIG_MAGIC );
}
for ( offset = head ; offset < tail ; offset += 8 ) {
if ( ( rc = phantom_read_test_mem ( phantom, offset,
buf.dwords ) ) != 0 ) {
DBGC ( phantom, "Phantom %p could not read from test "
"memory: %s\n", phantom, strerror ( rc ) );
/* Locate start of last (max_lines) lines */
for ( offset = tail ; offset > head ; offset-- ) {
if ( ( byte = phantom_read_test_mem ( phantom,
( offset - 1 ) ) ) < 0 )
return byte;
if ( ( byte == '\n' ) && ( max_lines-- == 0 ) )
break;
}
for ( i = 0 ; ( ( i < sizeof ( buf ) ) &&
( offset + i ) < tail ) ; i++ ) {
DBG ( "%c", buf.bytes[i] );
}
}
/* Print lines */
for ( ; offset < tail ; offset++ ) {
if ( ( byte = phantom_read_test_mem ( phantom, offset ) ) < 0 )
return byte;
DBG ( "%c", byte );
}
DBG ( "\n" );
return 0;
}
/**
* Dump Phantom firmware dmesg logs
*
* @v phantom Phantom NIC
* @v max_lines Maximum number of lines to show, or -1 to show all
*/
static void __attribute__ (( unused ))
phantom_dmesg_all ( struct phantom_nic *phantom ) {
phantom_dmesg_all ( struct phantom_nic *phantom, unsigned int max_lines ) {
unsigned int i;
for ( i = 0 ; i < UNM_CAM_RAM_NUM_DMESG_BUFFERS ; i++ )
phantom_dmesg ( phantom, i );
phantom_dmesg ( phantom, i, max_lines );
}
/***************************************************************************