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Change to POLL api and fixes for FlexRM and OMAP driver

Browse source 
- Core: Prefer ACK method over POLL, if both supported
 - Test: use flag instead of special character
 - FlexRM: Usual driver internal minor churn
 - Omap: fix error path
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Merge tag 'mailbox-v4.15' of git://git.linaro.org/landing-teams/working/fujitsu/integration

Pull mailbox updates from Jassi Brar:
 "Change to POLL api and fixes for FlexRM and OMAP driver.

  Summary:

   - Core: Prefer ACK method over POLL, if both supported

   - Test: use flag instead of special character

   - FlexRM: Usual driver internal minor churn

   - Omap: fix error path"

* tag 'mailbox-v4.15' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
  mailbox/omap: unregister mbox class
  mailbox: mailbox-test: don't rely on rx_buffer content to signal data ready
  mailbox: reset txdone_method TXDONE_BY_POLL if client knows_txdone
  mailbox: Build Broadcom FlexRM driver as loadable module for iProc SOCs
  mailbox: bcm-flexrm-mailbox: Use common GPL comment header
  mailbox: bcm-flexrm-mailbox: add depends on ARCH_BCM_IPROC
  mailbox: bcm-flexrm-mailbox: Print ring number in errors and warnings
  mailbox: bcm-flexrm-mailbox: Fix FlexRM ring flush sequence
This commit is contained in:
Linus Torvalds 2017-11-15 13:39:18 -08:00
commit 3c18767a45
6 changed files with 66 additions and 28 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
drivers/mailbox/Kconfig
View file

@ -163,9 +163,10 @@ config BCM_PDC_MBOX
config BCM_FLEXRM_MBOX
tristate "Broadcom FlexRM Mailbox"
depends on ARM64
depends on ARCH_BCM_IPROC || COMPILE_TEST
depends on HAS_DMA
select GENERIC_MSI_IRQ_DOMAIN
default ARCH_BCM_IPROC
default m if ARCH_BCM_IPROC
help
Mailbox implementation of the Broadcom FlexRM ring manager,
which provides access to various offload engines on Broadcom

66
drivers/mailbox/bcm-flexrm-mailbox.c
View file

@ -1,10 +1,18 @@
/* Broadcom FlexRM Mailbox Driver
*
/*
* Copyright (C) 2017 Broadcom
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
/*
* Broadcom FlexRM Mailbox Driver
*
* Each Broadcom FlexSparx4 offload engine is implemented as an
* extension to Broadcom FlexRM ring manager. The FlexRM ring
@ -1116,8 +1124,8 @@ static int flexrm_process_completions(struct flexrm_ring *ring)
err = flexrm_cmpl_desc_to_error(desc);
if (err < 0) {
dev_warn(ring->mbox->dev,
"got completion desc=0x%lx with error %d",
(unsigned long)desc, err);
"ring%d got completion desc=0x%lx with error %d\n",
ring->num, (unsigned long)desc, err);
}
/* Determine request id from completion descriptor */
@ -1127,8 +1135,8 @@ static int flexrm_process_completions(struct flexrm_ring *ring)
msg = ring->requests[reqid];
if (!msg) {
dev_warn(ring->mbox->dev,
"null msg pointer for completion desc=0x%lx",
(unsigned long)desc);
"ring%d null msg pointer for completion desc=0x%lx\n",
ring->num, (unsigned long)desc);
continue;
}
@ -1238,7 +1246,9 @@ static int flexrm_startup(struct mbox_chan *chan)
ring->bd_base = dma_pool_alloc(ring->mbox->bd_pool,
GFP_KERNEL, &ring->bd_dma_base);
if (!ring->bd_base) {
dev_err(ring->mbox->dev, "can't allocate BD memory\n");
dev_err(ring->mbox->dev,
"can't allocate BD memory for ring%d\n",
ring->num);
ret = -ENOMEM;
goto fail;
}
@ -1261,7 +1271,9 @@ static int flexrm_startup(struct mbox_chan *chan)
ring->cmpl_base = dma_pool_alloc(ring->mbox->cmpl_pool,
GFP_KERNEL, &ring->cmpl_dma_base);
if (!ring->cmpl_base) {
dev_err(ring->mbox->dev, "can't allocate completion memory\n");
dev_err(ring->mbox->dev,
"can't allocate completion memory for ring%d\n",
ring->num);
ret = -ENOMEM;
goto fail_free_bd_memory;
}
@ -1269,7 +1281,8 @@ static int flexrm_startup(struct mbox_chan *chan)
/* Request IRQ */
if (ring->irq == UINT_MAX) {
dev_err(ring->mbox->dev, "ring IRQ not available\n");
dev_err(ring->mbox->dev,
"ring%d IRQ not available\n", ring->num);
ret = -ENODEV;
goto fail_free_cmpl_memory;
}
@ -1278,7 +1291,8 @@ static int flexrm_startup(struct mbox_chan *chan)
flexrm_irq_thread,
0, dev_name(ring->mbox->dev), ring);
if (ret) {
dev_err(ring->mbox->dev, "failed to request ring IRQ\n");
dev_err(ring->mbox->dev,
"failed to request ring%d IRQ\n", ring->num);
goto fail_free_cmpl_memory;
}
ring->irq_requested = true;
@ -1291,7 +1305,9 @@ static int flexrm_startup(struct mbox_chan *chan)
&ring->irq_aff_hint);
ret = irq_set_affinity_hint(ring->irq, &ring->irq_aff_hint);
if (ret) {
dev_err(ring->mbox->dev, "failed to set IRQ affinity hint\n");
dev_err(ring->mbox->dev,
"failed to set IRQ affinity hint for ring%d\n",
ring->num);
goto fail_free_irq;
}
@ -1365,8 +1381,8 @@ static void flexrm_shutdown(struct mbox_chan *chan)
/* Disable/inactivate ring */
writel_relaxed(0x0, ring->regs + RING_CONTROL);
/* Flush ring with timeout of 1s */
timeout = 1000;
/* Set ring flush state */
timeout = 1000; /* timeout of 1s */
writel_relaxed(BIT(CONTROL_FLUSH_SHIFT),
ring->regs + RING_CONTROL);
do {
@ -1374,7 +1390,23 @@ static void flexrm_shutdown(struct mbox_chan *chan)
FLUSH_DONE_MASK)
break;
mdelay(1);
} while (timeout--);
} while (--timeout);
if (!timeout)
dev_err(ring->mbox->dev,
"setting ring%d flush state timedout\n", ring->num);
/* Clear ring flush state */
timeout = 1000; /* timeout of 1s */
writel_relaxed(0x0, ring + RING_CONTROL);
do {
if (!(readl_relaxed(ring + RING_FLUSH_DONE) &
FLUSH_DONE_MASK))
break;
mdelay(1);
} while (--timeout);
if (!timeout)
dev_err(ring->mbox->dev,
"clearing ring%d flush state timedout\n", ring->num);
/* Abort all in-flight requests */
for (reqid = 0; reqid < RING_MAX_REQ_COUNT; reqid++) {

11
drivers/mailbox/mailbox-test.c
View file

@ -30,6 +30,7 @@
#define MBOX_HEXDUMP_MAX_LEN (MBOX_HEXDUMP_LINE_LEN * \
(MBOX_MAX_MSG_LEN / MBOX_BYTES_PER_LINE))
static bool mbox_data_ready;
static struct dentry *root_debugfs_dir;
struct mbox_test_device {
@ -152,16 +153,14 @@ static ssize_t mbox_test_message_write(struct file *filp,
static bool mbox_test_message_data_ready(struct mbox_test_device *tdev)
{
unsigned char data;
bool data_ready;
unsigned long flags;
spin_lock_irqsave(&tdev->lock, flags);
data = tdev->rx_buffer[0];
data_ready = mbox_data_ready;
spin_unlock_irqrestore(&tdev->lock, flags);
if (data != '\0')
return true;
return false;
return data_ready;
}
static ssize_t mbox_test_message_read(struct file *filp, char __user *userbuf,
@ -223,6 +222,7 @@ static ssize_t mbox_test_message_read(struct file *filp, char __user *userbuf,
*(touser + l) = '\0';
memset(tdev->rx_buffer, 0, MBOX_MAX_MSG_LEN);
mbox_data_ready = false;
spin_unlock_irqrestore(&tdev->lock, flags);
@ -292,6 +292,7 @@ static void mbox_test_receive_message(struct mbox_client *client, void *message)
message, MBOX_MAX_MSG_LEN);
memcpy(tdev->rx_buffer, message, MBOX_MAX_MSG_LEN);
}
mbox_data_ready = true;
spin_unlock_irqrestore(&tdev->lock, flags);
wake_up_interruptible(&tdev->waitq);

4
drivers/mailbox/mailbox.c
View file

@ -351,7 +351,7 @@ struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index)
init_completion(&chan->tx_complete);
if (chan->txdone_method == TXDONE_BY_POLL && cl->knows_txdone)
chan->txdone_method |= TXDONE_BY_ACK;
chan->txdone_method = TXDONE_BY_ACK;
spin_unlock_irqrestore(&chan->lock, flags);
@ -418,7 +418,7 @@ void mbox_free_channel(struct mbox_chan *chan)
spin_lock_irqsave(&chan->lock, flags);
chan->cl = NULL;
chan->active_req = NULL;
if (chan->txdone_method == (TXDONE_BY_POLL | TXDONE_BY_ACK))
if (chan->txdone_method == TXDONE_BY_ACK)
chan->txdone_method = TXDONE_BY_POLL;
module_put(chan->mbox->dev->driver->owner);

6
drivers/mailbox/omap-mailbox.c
View file

@ -906,7 +906,11 @@ static int __init omap_mbox_init(void)
mbox_kfifo_size = max_t(unsigned int, mbox_kfifo_size,
sizeof(mbox_msg_t));
return platform_driver_register(&omap_mbox_driver);
err = platform_driver_register(&omap_mbox_driver);
if (err)
class_unregister(&omap_mbox_class);
return err;
}
subsys_initcall(omap_mbox_init);

4
drivers/mailbox/pcc.c
View file

@ -265,7 +265,7 @@ struct mbox_chan *pcc_mbox_request_channel(struct mbox_client *cl,
init_completion(&chan->tx_complete);
if (chan->txdone_method == TXDONE_BY_POLL && cl->knows_txdone)
chan->txdone_method |= TXDONE_BY_ACK;
chan->txdone_method = TXDONE_BY_ACK;
spin_unlock_irqrestore(&chan->lock, flags);
@ -311,7 +311,7 @@ void pcc_mbox_free_channel(struct mbox_chan *chan)
spin_lock_irqsave(&chan->lock, flags);
chan->cl = NULL;
chan->active_req = NULL;
if (chan->txdone_method == (TXDONE_BY_POLL | TXDONE_BY_ACK))
if (chan->txdone_method == TXDONE_BY_ACK)
chan->txdone_method = TXDONE_BY_POLL;
spin_unlock_irqrestore(&chan->lock, flags);