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scsi: esp_scsi: Optimize PIO loops 

Avoid function calls in the inner PIO loops. On a Centris 660av this
improves throughput for sequential read transfers by about 40% and
sequential write by about 10%.

Unfortunately it is not possible to have methods like .esp_write8 placed
inline so this is always going to be slow, even with LTO.

Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Finn Thain 2018-10-16 16:31:25 +11:00 committed by Martin K. Petersen
parent 53dce332db
commit 8c6f803fd6
1 changed files with 6 additions and 6 deletions
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12
drivers/scsi/esp_scsi.c
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@ -2794,7 +2794,7 @@ static inline unsigned int esp_wait_for_fifo(struct esp *esp)
if (fbytes)
return fbytes;
udelay(2);
udelay(1);
} while (--i);
shost_printk(KERN_ERR, esp->host, "FIFO is empty. sreg [%02x]\n",
@ -2811,7 +2811,7 @@ static inline int esp_wait_for_intr(struct esp *esp)
if (esp->sreg & ESP_STAT_INTR)
return 0;
udelay(2);
udelay(1);
} while (--i);
shost_printk(KERN_ERR, esp->host, "IRQ timeout. sreg [%02x]\n",
@ -2839,7 +2839,7 @@ void esp_send_pio_cmd(struct esp *esp, u32 addr, u32 esp_count,
if (!esp_wait_for_fifo(esp))
break;
*dst++ = esp_read8(ESP_FDATA);
*dst++ = readb(esp->fifo_reg);
--esp_count;
if (!esp_count)
@ -2860,9 +2860,9 @@ void esp_send_pio_cmd(struct esp *esp, u32 addr, u32 esp_count,
}
if (phase == ESP_MIP)
scsi_esp_cmd(esp, ESP_CMD_MOK);
esp_write8(ESP_CMD_MOK, ESP_CMD);
scsi_esp_cmd(esp, ESP_CMD_TI);
esp_write8(ESP_CMD_TI, ESP_CMD);
}
} else {
unsigned int n = ESP_FIFO_SIZE;
@ -2902,7 +2902,7 @@ void esp_send_pio_cmd(struct esp *esp, u32 addr, u32 esp_count,
src += n;
esp_count -= n;
scsi_esp_cmd(esp, ESP_CMD_TI);
esp_write8(ESP_CMD_TI, ESP_CMD);
}
}