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vfio-mdev/mtty: Simplify interrupt generation 

While generating interrupt, mdev_state is already available for which
interrupt is generated.
Instead of doing indirect way from state->device->uuid-> to searching
state linearly in linked list on every interrupt generation,
directly use the available state.

Hence, simplify the code to use mdev_state and remove unused helper
function with that.

Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Parav Pandit 2019-08-08 09:12:54 -05:00 committed by Alex Williamson
parent d1abaeb3be
commit eee413e620
1 changed files with 8 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
samples/vfio-mdev/mtty.c
View File

@ -152,20 +152,9 @@ static const struct file_operations vd_fops = {
/* function prototypes */
static int mtty_trigger_interrupt(const guid_t *uuid);
static int mtty_trigger_interrupt(struct mdev_state *mdev_state);
/* Helper functions */
static struct mdev_state *find_mdev_state_by_uuid(const guid_t *uuid)
{
struct mdev_state *mds;
list_for_each_entry(mds, &mdev_devices_list, next) {
if (guid_equal(mdev_uuid(mds->mdev), uuid))
return mds;
}
return NULL;
}
static void dump_buffer(u8 *buf, uint32_t count)
{
@ -337,8 +326,7 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state,
pr_err("Serial port %d: Fifo level trigger\n",
index);
#endif
mtty_trigger_interrupt(
mdev_uuid(mdev_state->mdev));
mtty_trigger_interrupt(mdev_state);
}
} else {
#if defined(DEBUG_INTR)
@ -352,8 +340,7 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state,
*/
if (mdev_state->s[index].uart_reg[UART_IER] &
UART_IER_RLSI)
mtty_trigger_interrupt(
mdev_uuid(mdev_state->mdev));
mtty_trigger_interrupt(mdev_state);
}
mutex_unlock(&mdev_state->rxtx_lock);
break;
@ -372,8 +359,7 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state,
pr_err("Serial port %d: IER_THRI write\n",
index);
#endif
mtty_trigger_interrupt(
mdev_uuid(mdev_state->mdev));
mtty_trigger_interrupt(mdev_state);
}
mutex_unlock(&mdev_state->rxtx_lock);
@ -444,7 +430,7 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state,
#if defined(DEBUG_INTR)
pr_err("Serial port %d: MCR_OUT2 write\n", index);
#endif
mtty_trigger_interrupt(mdev_uuid(mdev_state->mdev));
mtty_trigger_interrupt(mdev_state);
}
if ((mdev_state->s[index].uart_reg[UART_IER] & UART_IER_MSI) &&
@ -452,7 +438,7 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state,
#if defined(DEBUG_INTR)
pr_err("Serial port %d: MCR RTS/DTR write\n", index);
#endif
mtty_trigger_interrupt(mdev_uuid(mdev_state->mdev));
mtty_trigger_interrupt(mdev_state);
}
break;
@ -503,8 +489,7 @@ static void handle_bar_read(unsigned int index, struct mdev_state *mdev_state,
#endif
if (mdev_state->s[index].uart_reg[UART_IER] &
UART_IER_THRI)
mtty_trigger_interrupt(
mdev_uuid(mdev_state->mdev));
mtty_trigger_interrupt(mdev_state);
}
mutex_unlock(&mdev_state->rxtx_lock);
@ -1028,17 +1013,9 @@ static int mtty_set_irqs(struct mdev_device *mdev, uint32_t flags,
return ret;
}
static int mtty_trigger_interrupt(const guid_t *uuid)
static int mtty_trigger_interrupt(struct mdev_state *mdev_state)
{
int ret = -1;
struct mdev_state *mdev_state;
mdev_state = find_mdev_state_by_uuid(uuid);
if (!mdev_state) {
pr_info("%s: mdev not found\n", __func__);
return -EINVAL;
}
if ((mdev_state->irq_index == VFIO_PCI_MSI_IRQ_INDEX) &&
(!mdev_state->msi_evtfd))