From: Alex Williamson <alex.williamson@redhat.com>
To: Parav Pandit <parav@mellanox.com>
Cc: kvm@vger.kernel.org, kwankhede@nvidia.com,
linux-kernel@vger.kernel.org, cohuck@redhat.com, cjia@nvidia.com
Subject: Re: [PATCH v2 1/2] vfio-mdev/mtty: Simplify interrupt generation
Date: Fri, 23 Aug 2019 14:48:43 -0600 [thread overview]
Message-ID: <20190823144843.1d778c6b@x1.home> (raw)
In-Reply-To: <20190808141255.45236-2-parav@mellanox.com>
On Thu, 8 Aug 2019 09:12:54 -0500
Parav Pandit <parav@mellanox.com> wrote:
> 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>
> ---
> samples/vfio-mdev/mtty.c | 39 ++++++++-------------------------------
> 1 file changed, 8 insertions(+), 31 deletions(-)
Applied this commit to vfio next branch with Christoph's review for
v5.4. As Connie has another use case for the mdev_uuid() API in
flight, I'm not applying patch 2/. Thanks,
Alex
> diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
> index 92e770a06ea2..ce84a300a4da 100644
> --- a/samples/vfio-mdev/mtty.c
> +++ b/samples/vfio-mdev/mtty.c
> @@ -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))
next prev parent reply other threads:[~2019-08-23 20:48 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-02 6:59 [PATCH 0/2] Simplify mtty driver and mdev core Parav Pandit
2019-08-02 6:59 ` [PATCH 1/2] vfio-mdev/mtty: Simplify interrupt generation Parav Pandit
2019-08-06 8:15 ` Cornelia Huck
2019-08-02 6:59 ` [PATCH 2/2] vfio/mdev: Removed unused and redundant API for mdev name Parav Pandit
2019-08-06 8:29 ` Cornelia Huck
2019-08-06 13:12 ` Parav Pandit
2019-08-06 14:18 ` [PATCH v1 0/2] Simplify mtty driver and mdev core Parav Pandit
2019-08-06 14:18 ` [PATCH v1 1/2] vfio-mdev/mtty: Simplify interrupt generation Parav Pandit
2019-08-06 14:18 ` [PATCH v1 2/2] vfio/mdev: Removed unused and redundant API for mdev UUID Parav Pandit
2019-08-07 9:28 ` Cornelia Huck
2019-08-07 16:33 ` Parav Pandit
2019-08-08 8:29 ` Cornelia Huck
2019-08-08 14:01 ` Parav Pandit
2019-08-08 14:12 ` [PATCH v2 0/2] Simplify mtty driver and mdev core Parav Pandit
2019-08-08 14:12 ` [PATCH v2 1/2] vfio-mdev/mtty: Simplify interrupt generation Parav Pandit
2019-08-13 16:39 ` Christoph Hellwig
2019-08-23 20:48 ` Alex Williamson [this message]
2019-08-08 14:12 ` [PATCH v2 2/2] vfio/mdev: Removed unused and redundant API for mdev UUID Parav Pandit
2019-08-13 16:39 ` Christoph Hellwig
2019-08-16 15:22 ` Cornelia Huck
2019-08-08 23:02 ` [PATCH v2 0/2] Simplify mtty driver and mdev core Alex Williamson
2019-08-09 8:07 ` Cornelia Huck
2019-08-12 11:35 ` Kirti Wankhede
2019-08-13 14:40 ` Parav Pandit
2019-08-13 14:52 ` Alex Williamson
2019-08-13 16:28 ` Parav Pandit
2019-08-13 16:34 ` Cornelia Huck
2019-08-13 17:11 ` Alex Williamson
2019-08-14 5:54 ` Parav Pandit
2019-08-14 8:01 ` Cornelia Huck
2019-08-14 12:27 ` Parav Pandit
2019-08-14 13:09 ` Cornelia Huck
2019-08-14 13:45 ` Parav Pandit
2019-08-14 14:57 ` Alex Williamson
2019-08-14 16:21 ` Parav Pandit
2019-08-20 8:58 ` Parav Pandit
2019-08-20 9:58 ` Christophe de Dinechin
2019-08-20 11:25 ` Parav Pandit
2019-08-20 16:31 ` Cornelia Huck
2019-08-21 2:42 ` Parav Pandit
2019-08-20 17:19 ` Alex Williamson
2019-08-20 17:55 ` Cornelia Huck
2019-08-21 3:57 ` Parav Pandit
2019-08-21 3:42 ` Parav Pandit
2019-08-21 4:20 ` Alex Williamson
2019-08-21 4:40 ` Parav Pandit
2019-08-21 4:57 ` Alex Williamson
2019-08-21 5:01 ` Parav Pandit
2019-08-21 5:26 ` Alex Williamson
2019-08-21 6:23 ` Parav Pandit
2019-08-22 9:29 ` Jiri Pirko
2019-08-22 9:42 ` Parav Pandit
2019-08-22 9:58 ` Jiri Pirko
2019-08-22 10:04 ` Parav Pandit
2019-08-22 12:19 ` Jiri Pirko
2019-08-22 13:33 ` Parav Pandit
2019-08-23 8:12 ` Jiri Pirko
2019-08-23 8:14 ` Parav Pandit
2019-08-23 14:28 ` Alex Williamson
2019-08-23 14:53 ` Parav Pandit
2019-08-23 15:04 ` Jiri Pirko
2019-08-23 15:52 ` Alex Williamson
2019-08-23 16:14 ` Parav Pandit
2019-08-23 17:16 ` Alex Williamson
2019-08-23 18:00 ` Parav Pandit
2019-08-23 19:43 ` Alex Williamson
2019-08-24 3:56 ` Parav Pandit
2019-08-24 4:45 ` Parav Pandit
2019-08-24 4:59 ` Alex Williamson
2019-08-24 5:22 ` Parav Pandit
2019-08-13 16:37 ` Christoph Hellwig
2019-08-13 17:40 ` Greg Kroah-Hartman
2019-08-14 5:30 ` Parav Pandit
2019-08-13 14:48 ` Parav Pandit
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