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amd-xgbe: Optimize DMA channel interrupt enablement
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Currently whenever the driver needs to enable or disable interrupts for
a DMA channel it reads the interrupt enable register (IER), updates the
value and then writes the new value back to the IER. Since the hardware
does not change the IER, software can track this value and elimiate the
need to read it each time.

Add the IER value to the channel related data structure and use that as
the base for enabling and disabling interrupts, thus removing the need
for the MMIO read.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Lendacky, Thomas authored and David S. Miller committed Aug 18, 2017
1 parent 40452f0 commit caa575a
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Showing 2 changed files with 37 additions and 44 deletions.
77 changes: 35 additions & 42 deletions drivers/net/ethernet/amd/xgbe/xgbe-dev.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -605,7 +605,6 @@ static void xgbe_config_flow_control(struct xgbe_prv_data *pdata)
static void xgbe_enable_dma_interrupts(struct xgbe_prv_data *pdata)
{
struct xgbe_channel *channel;
unsigned int dma_ch_isr, dma_ch_ier;
unsigned int i;

/* Set the interrupt mode if supported */
Expand All @@ -617,20 +616,20 @@ static void xgbe_enable_dma_interrupts(struct xgbe_prv_data *pdata)
channel = pdata->channel[i];

/* Clear all the interrupts which are set */
dma_ch_isr = XGMAC_DMA_IOREAD(channel, DMA_CH_SR);
XGMAC_DMA_IOWRITE(channel, DMA_CH_SR, dma_ch_isr);
XGMAC_DMA_IOWRITE(channel, DMA_CH_SR,
XGMAC_DMA_IOREAD(channel, DMA_CH_SR));

/* Clear all interrupt enable bits */
dma_ch_ier = 0;
channel->curr_ier = 0;

/* Enable following interrupts
* NIE - Normal Interrupt Summary Enable
* AIE - Abnormal Interrupt Summary Enable
* FBEE - Fatal Bus Error Enable
*/
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, NIE, 1);
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, AIE, 1);
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, FBEE, 1);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, NIE, 1);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, AIE, 1);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, FBEE, 1);

if (channel->tx_ring) {
/* Enable the following Tx interrupts
Expand All @@ -639,7 +638,8 @@ static void xgbe_enable_dma_interrupts(struct xgbe_prv_data *pdata)
* mode)
*/
if (!pdata->per_channel_irq || pdata->channel_irq_mode)
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, TIE, 1);
XGMAC_SET_BITS(channel->curr_ier,
DMA_CH_IER, TIE, 1);
}
if (channel->rx_ring) {
/* Enable following Rx interrupts
Expand All @@ -648,12 +648,13 @@ static void xgbe_enable_dma_interrupts(struct xgbe_prv_data *pdata)
* per channel interrupts in edge triggered
* mode)
*/
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, RBUE, 1);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, RBUE, 1);
if (!pdata->per_channel_irq || pdata->channel_irq_mode)
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, RIE, 1);
XGMAC_SET_BITS(channel->curr_ier,
DMA_CH_IER, RIE, 1);
}

XGMAC_DMA_IOWRITE(channel, DMA_CH_IER, dma_ch_ier);
XGMAC_DMA_IOWRITE(channel, DMA_CH_IER, channel->curr_ier);
}
}

Expand Down Expand Up @@ -1964,90 +1965,82 @@ static int xgbe_is_last_desc(struct xgbe_ring_desc *rdesc)
static int xgbe_enable_int(struct xgbe_channel *channel,
enum xgbe_int int_id)
{
unsigned int dma_ch_ier;

dma_ch_ier = XGMAC_DMA_IOREAD(channel, DMA_CH_IER);

switch (int_id) {
case XGMAC_INT_DMA_CH_SR_TI:
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, TIE, 1);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, TIE, 1);
break;
case XGMAC_INT_DMA_CH_SR_TPS:
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, TXSE, 1);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, TXSE, 1);
break;
case XGMAC_INT_DMA_CH_SR_TBU:
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, TBUE, 1);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, TBUE, 1);
break;
case XGMAC_INT_DMA_CH_SR_RI:
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, RIE, 1);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, RIE, 1);
break;
case XGMAC_INT_DMA_CH_SR_RBU:
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, RBUE, 1);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, RBUE, 1);
break;
case XGMAC_INT_DMA_CH_SR_RPS:
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, RSE, 1);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, RSE, 1);
break;
case XGMAC_INT_DMA_CH_SR_TI_RI:
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, TIE, 1);
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, RIE, 1);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, TIE, 1);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, RIE, 1);
break;
case XGMAC_INT_DMA_CH_SR_FBE:
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, FBEE, 1);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, FBEE, 1);
break;
case XGMAC_INT_DMA_ALL:
dma_ch_ier |= channel->saved_ier;
channel->curr_ier |= channel->saved_ier;
break;
default:
return -1;
}

XGMAC_DMA_IOWRITE(channel, DMA_CH_IER, dma_ch_ier);
XGMAC_DMA_IOWRITE(channel, DMA_CH_IER, channel->curr_ier);

return 0;
}

static int xgbe_disable_int(struct xgbe_channel *channel,
enum xgbe_int int_id)
{
unsigned int dma_ch_ier;

dma_ch_ier = XGMAC_DMA_IOREAD(channel, DMA_CH_IER);

switch (int_id) {
case XGMAC_INT_DMA_CH_SR_TI:
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, TIE, 0);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, TIE, 0);
break;
case XGMAC_INT_DMA_CH_SR_TPS:
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, TXSE, 0);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, TXSE, 0);
break;
case XGMAC_INT_DMA_CH_SR_TBU:
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, TBUE, 0);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, TBUE, 0);
break;
case XGMAC_INT_DMA_CH_SR_RI:
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, RIE, 0);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, RIE, 0);
break;
case XGMAC_INT_DMA_CH_SR_RBU:
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, RBUE, 0);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, RBUE, 0);
break;
case XGMAC_INT_DMA_CH_SR_RPS:
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, RSE, 0);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, RSE, 0);
break;
case XGMAC_INT_DMA_CH_SR_TI_RI:
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, TIE, 0);
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, RIE, 0);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, TIE, 0);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, RIE, 0);
break;
case XGMAC_INT_DMA_CH_SR_FBE:
XGMAC_SET_BITS(dma_ch_ier, DMA_CH_IER, FBEE, 0);
XGMAC_SET_BITS(channel->curr_ier, DMA_CH_IER, FBEE, 0);
break;
case XGMAC_INT_DMA_ALL:
channel->saved_ier = dma_ch_ier & XGBE_DMA_INTERRUPT_MASK;
dma_ch_ier &= ~XGBE_DMA_INTERRUPT_MASK;
channel->saved_ier = channel->curr_ier;
channel->curr_ier = 0;
break;
default:
return -1;
}

XGMAC_DMA_IOWRITE(channel, DMA_CH_IER, dma_ch_ier);
XGMAC_DMA_IOWRITE(channel, DMA_CH_IER, channel->curr_ier);

return 0;
}
Expand Down
4 changes: 2 additions & 2 deletions drivers/net/ethernet/amd/xgbe/xgbe.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -182,8 +182,6 @@
#define XGBE_IRQ_MODE_EDGE 0
#define XGBE_IRQ_MODE_LEVEL 1

#define XGBE_DMA_INTERRUPT_MASK 0x31c7

#define XGMAC_MIN_PACKET 60
#define XGMAC_STD_PACKET_MTU 1500
#define XGMAC_MAX_STD_PACKET 1518
Expand Down Expand Up @@ -462,6 +460,8 @@ struct xgbe_channel {
/* Netdev related settings */
struct napi_struct napi;

/* Per channel interrupt enablement tracker */
unsigned int curr_ier;
unsigned int saved_ier;

unsigned int tx_timer_active;
Expand Down

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