aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/dma/idxd
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/dma/idxd')
-rw-r--r--drivers/dma/idxd/cdev.c3
-rw-r--r--drivers/dma/idxd/device.c222
-rw-r--r--drivers/dma/idxd/dma.c3
-rw-r--r--drivers/dma/idxd/idxd.h21
-rw-r--r--drivers/dma/idxd/init.c34
-rw-r--r--drivers/dma/idxd/irq.c43
-rw-r--r--drivers/dma/idxd/submit.c74
-rw-r--r--drivers/dma/idxd/sysfs.c22
8 files changed, 174 insertions, 248 deletions
diff --git a/drivers/dma/idxd/cdev.c b/drivers/dma/idxd/cdev.c
index cb376cf6a2d2..c3976156db2f 100644
--- a/drivers/dma/idxd/cdev.c
+++ b/drivers/dma/idxd/cdev.c
@@ -115,6 +115,9 @@ static int idxd_cdev_release(struct inode *node, struct file *filep)
dev_dbg(dev, "%s called\n", __func__);
filep->private_data = NULL;
+ /* Wait for in-flight operations to complete. */
+ idxd_wq_drain(wq);
+
kfree(ctx);
mutex_lock(&wq->wq_lock);
idxd_wq_put(wq);
diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
index 8d2718c585dc..14b45853aa5f 100644
--- a/drivers/dma/idxd/device.c
+++ b/drivers/dma/idxd/device.c
@@ -6,70 +6,39 @@
#include <linux/pci.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/dmaengine.h>
+#include <linux/irq.h>
+#include <linux/msi.h>
#include <uapi/linux/idxd.h>
#include "../dmaengine.h"
#include "idxd.h"
#include "registers.h"
-static int idxd_cmd_wait(struct idxd_device *idxd, u32 *status, int timeout);
-static int idxd_cmd_send(struct idxd_device *idxd, int cmd_code, u32 operand);
+static void idxd_cmd_exec(struct idxd_device *idxd, int cmd_code, u32 operand,
+ u32 *status);
/* Interrupt control bits */
-int idxd_mask_msix_vector(struct idxd_device *idxd, int vec_id)
+void idxd_mask_msix_vector(struct idxd_device *idxd, int vec_id)
{
- struct pci_dev *pdev = idxd->pdev;
- int msixcnt = pci_msix_vec_count(pdev);
- union msix_perm perm;
- u32 offset;
-
- if (vec_id < 0 || vec_id >= msixcnt)
- return -EINVAL;
+ struct irq_data *data = irq_get_irq_data(idxd->msix_entries[vec_id].vector);
- offset = idxd->msix_perm_offset + vec_id * 8;
- perm.bits = ioread32(idxd->reg_base + offset);
- perm.ignore = 1;
- iowrite32(perm.bits, idxd->reg_base + offset);
-
- return 0;
+ pci_msi_mask_irq(data);
}
void idxd_mask_msix_vectors(struct idxd_device *idxd)
{
struct pci_dev *pdev = idxd->pdev;
int msixcnt = pci_msix_vec_count(pdev);
- int i, rc;
+ int i;
- for (i = 0; i < msixcnt; i++) {
- rc = idxd_mask_msix_vector(idxd, i);
- if (rc < 0)
- dev_warn(&pdev->dev,
- "Failed disabling msix vec %d\n", i);
- }
+ for (i = 0; i < msixcnt; i++)
+ idxd_mask_msix_vector(idxd, i);
}
-int idxd_unmask_msix_vector(struct idxd_device *idxd, int vec_id)
+void idxd_unmask_msix_vector(struct idxd_device *idxd, int vec_id)
{
- struct pci_dev *pdev = idxd->pdev;
- int msixcnt = pci_msix_vec_count(pdev);
- union msix_perm perm;
- u32 offset;
-
- if (vec_id < 0 || vec_id >= msixcnt)
- return -EINVAL;
+ struct irq_data *data = irq_get_irq_data(idxd->msix_entries[vec_id].vector);
- offset = idxd->msix_perm_offset + vec_id * 8;
- perm.bits = ioread32(idxd->reg_base + offset);
- perm.ignore = 0;
- iowrite32(perm.bits, idxd->reg_base + offset);
-
- /*
- * A readback from the device ensures that any previously generated
- * completion record writes are visible to software based on PCI
- * ordering rules.
- */
- perm.bits = ioread32(idxd->reg_base + offset);
-
- return 0;
+ pci_msi_unmask_irq(data);
}
void idxd_unmask_error_interrupts(struct idxd_device *idxd)
@@ -160,16 +129,14 @@ static int alloc_descs(struct idxd_wq *wq, int num)
int idxd_wq_alloc_resources(struct idxd_wq *wq)
{
struct idxd_device *idxd = wq->idxd;
- struct idxd_group *group = wq->group;
struct device *dev = &idxd->pdev->dev;
int rc, num_descs, i;
if (wq->type != IDXD_WQT_KERNEL)
return 0;
- num_descs = wq->size +
- idxd->hw.gen_cap.max_descs_per_engine * group->num_engines;
- wq->num_descs = num_descs;
+ wq->num_descs = wq->size;
+ num_descs = wq->size;
rc = alloc_hw_descs(wq, num_descs);
if (rc < 0)
@@ -187,8 +154,8 @@ int idxd_wq_alloc_resources(struct idxd_wq *wq)
if (rc < 0)
goto fail_alloc_descs;
- rc = sbitmap_init_node(&wq->sbmap, num_descs, -1, GFP_KERNEL,
- dev_to_node(dev));
+ rc = sbitmap_queue_init_node(&wq->sbq, num_descs, -1, false, GFP_KERNEL,
+ dev_to_node(dev));
if (rc < 0)
goto fail_sbitmap_init;
@@ -201,7 +168,7 @@ int idxd_wq_alloc_resources(struct idxd_wq *wq)
sizeof(struct dsa_completion_record) * i;
desc->id = i;
desc->wq = wq;
-
+ desc->cpu = -1;
dma_async_tx_descriptor_init(&desc->txd, &wq->dma_chan);
desc->txd.tx_submit = idxd_dma_tx_submit;
}
@@ -227,7 +194,7 @@ void idxd_wq_free_resources(struct idxd_wq *wq)
free_hw_descs(wq);
free_descs(wq);
dma_free_coherent(dev, wq->compls_size, wq->compls, wq->compls_addr);
- sbitmap_free(&wq->sbmap);
+ sbitmap_queue_free(&wq->sbq);
}
int idxd_wq_enable(struct idxd_wq *wq)
@@ -235,21 +202,13 @@ int idxd_wq_enable(struct idxd_wq *wq)
struct idxd_device *idxd = wq->idxd;
struct device *dev = &idxd->pdev->dev;
u32 status;
- int rc;
-
- lockdep_assert_held(&idxd->dev_lock);
if (wq->state == IDXD_WQ_ENABLED) {
dev_dbg(dev, "WQ %d already enabled\n", wq->id);
return -ENXIO;
}
- rc = idxd_cmd_send(idxd, IDXD_CMD_ENABLE_WQ, wq->id);
- if (rc < 0)
- return rc;
- rc = idxd_cmd_wait(idxd, &status, IDXD_REG_TIMEOUT);
- if (rc < 0)
- return rc;
+ idxd_cmd_exec(idxd, IDXD_CMD_ENABLE_WQ, wq->id, &status);
if (status != IDXD_CMDSTS_SUCCESS &&
status != IDXD_CMDSTS_ERR_WQ_ENABLED) {
@@ -267,9 +226,7 @@ int idxd_wq_disable(struct idxd_wq *wq)
struct idxd_device *idxd = wq->idxd;
struct device *dev = &idxd->pdev->dev;
u32 status, operand;
- int rc;
- lockdep_assert_held(&idxd->dev_lock);
dev_dbg(dev, "Disabling WQ %d\n", wq->id);
if (wq->state != IDXD_WQ_ENABLED) {
@@ -278,12 +235,7 @@ int idxd_wq_disable(struct idxd_wq *wq)
}
operand = BIT(wq->id % 16) | ((wq->id / 16) << 16);
- rc = idxd_cmd_send(idxd, IDXD_CMD_DISABLE_WQ, operand);
- if (rc < 0)
- return rc;
- rc = idxd_cmd_wait(idxd, &status, IDXD_REG_TIMEOUT);
- if (rc < 0)
- return rc;
+ idxd_cmd_exec(idxd, IDXD_CMD_DISABLE_WQ, operand, &status);
if (status != IDXD_CMDSTS_SUCCESS) {
dev_dbg(dev, "WQ disable failed: %#x\n", status);
@@ -295,6 +247,22 @@ int idxd_wq_disable(struct idxd_wq *wq)
return 0;
}
+void idxd_wq_drain(struct idxd_wq *wq)
+{
+ struct idxd_device *idxd = wq->idxd;
+ struct device *dev = &idxd->pdev->dev;
+ u32 operand;
+
+ if (wq->state != IDXD_WQ_ENABLED) {
+ dev_dbg(dev, "WQ %d in wrong state: %d\n", wq->id, wq->state);
+ return;
+ }
+
+ dev_dbg(dev, "Draining WQ %d\n", wq->id);
+ operand = BIT(wq->id % 16) | ((wq->id / 16) << 16);
+ idxd_cmd_exec(idxd, IDXD_CMD_DRAIN_WQ, operand, NULL);
+}
+
int idxd_wq_map_portal(struct idxd_wq *wq)
{
struct idxd_device *idxd = wq->idxd;
@@ -357,66 +325,79 @@ static inline bool idxd_is_enabled(struct idxd_device *idxd)
return false;
}
-static int idxd_cmd_wait(struct idxd_device *idxd, u32 *status, int timeout)
+/*
+ * This is function is only used for reset during probe and will
+ * poll for completion. Once the device is setup with interrupts,
+ * all commands will be done via interrupt completion.
+ */
+void idxd_device_init_reset(struct idxd_device *idxd)
{
- u32 sts, to = timeout;
-
- lockdep_assert_held(&idxd->dev_lock);
- sts = ioread32(idxd->reg_base + IDXD_CMDSTS_OFFSET);
- while (sts & IDXD_CMDSTS_ACTIVE && --to) {
- cpu_relax();
- sts = ioread32(idxd->reg_base + IDXD_CMDSTS_OFFSET);
- }
+ struct device *dev = &idxd->pdev->dev;
+ union idxd_command_reg cmd;
+ unsigned long flags;
- if (to == 0 && sts & IDXD_CMDSTS_ACTIVE) {
- dev_warn(&idxd->pdev->dev, "%s timed out!\n", __func__);
- *status = 0;
- return -EBUSY;
- }
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.cmd = IDXD_CMD_RESET_DEVICE;
+ dev_dbg(dev, "%s: sending reset for init.\n", __func__);
+ spin_lock_irqsave(&idxd->dev_lock, flags);
+ iowrite32(cmd.bits, idxd->reg_base + IDXD_CMD_OFFSET);
- *status = sts;
- return 0;
+ while (ioread32(idxd->reg_base + IDXD_CMDSTS_OFFSET) &
+ IDXD_CMDSTS_ACTIVE)
+ cpu_relax();
+ spin_unlock_irqrestore(&idxd->dev_lock, flags);
}
-static int idxd_cmd_send(struct idxd_device *idxd, int cmd_code, u32 operand)
+static void idxd_cmd_exec(struct idxd_device *idxd, int cmd_code, u32 operand,
+ u32 *status)
{
union idxd_command_reg cmd;
- int rc;
- u32 status;
-
- lockdep_assert_held(&idxd->dev_lock);
- rc = idxd_cmd_wait(idxd, &status, IDXD_REG_TIMEOUT);
- if (rc < 0)
- return rc;
+ DECLARE_COMPLETION_ONSTACK(done);
+ unsigned long flags;
memset(&cmd, 0, sizeof(cmd));
cmd.cmd = cmd_code;
cmd.operand = operand;
+ cmd.int_req = 1;
+
+ spin_lock_irqsave(&idxd->dev_lock, flags);
+ wait_event_lock_irq(idxd->cmd_waitq,
+ !test_bit(IDXD_FLAG_CMD_RUNNING, &idxd->flags),
+ idxd->dev_lock);
+
dev_dbg(&idxd->pdev->dev, "%s: sending cmd: %#x op: %#x\n",
__func__, cmd_code, operand);
+
+ __set_bit(IDXD_FLAG_CMD_RUNNING, &idxd->flags);
+ idxd->cmd_done = &done;
iowrite32(cmd.bits, idxd->reg_base + IDXD_CMD_OFFSET);
- return 0;
+ /*
+ * After command submitted, release lock and go to sleep until
+ * the command completes via interrupt.
+ */
+ spin_unlock_irqrestore(&idxd->dev_lock, flags);
+ wait_for_completion(&done);
+ spin_lock_irqsave(&idxd->dev_lock, flags);
+ if (status)
+ *status = ioread32(idxd->reg_base + IDXD_CMDSTS_OFFSET);
+ __clear_bit(IDXD_FLAG_CMD_RUNNING, &idxd->flags);
+ /* Wake up other pending commands */
+ wake_up(&idxd->cmd_waitq);
+ spin_unlock_irqrestore(&idxd->dev_lock, flags);
}
int idxd_device_enable(struct idxd_device *idxd)
{
struct device *dev = &idxd->pdev->dev;
- int rc;
u32 status;
- lockdep_assert_held(&idxd->dev_lock);
if (idxd_is_enabled(idxd)) {
dev_dbg(dev, "Device already enabled\n");
return -ENXIO;
}
- rc = idxd_cmd_send(idxd, IDXD_CMD_ENABLE_DEVICE, 0);
- if (rc < 0)
- return rc;
- rc = idxd_cmd_wait(idxd, &status, IDXD_REG_TIMEOUT);
- if (rc < 0)
- return rc;
+ idxd_cmd_exec(idxd, IDXD_CMD_ENABLE_DEVICE, 0, &status);
/* If the command is successful or if the device was enabled */
if (status != IDXD_CMDSTS_SUCCESS &&
@@ -432,58 +413,29 @@ int idxd_device_enable(struct idxd_device *idxd)
int idxd_device_disable(struct idxd_device *idxd)
{
struct device *dev = &idxd->pdev->dev;
- int rc;
u32 status;
- lockdep_assert_held(&idxd->dev_lock);
if (!idxd_is_enabled(idxd)) {
dev_dbg(dev, "Device is not enabled\n");
return 0;
}
- rc = idxd_cmd_send(idxd, IDXD_CMD_DISABLE_DEVICE, 0);
- if (rc < 0)
- return rc;
- rc = idxd_cmd_wait(idxd, &status, IDXD_REG_TIMEOUT);
- if (rc < 0)
- return rc;
+ idxd_cmd_exec(idxd, IDXD_CMD_DISABLE_DEVICE, 0, &status);
/* If the command is successful or if the device was disabled */
if (status != IDXD_CMDSTS_SUCCESS &&
!(status & IDXD_CMDSTS_ERR_DIS_DEV_EN)) {
dev_dbg(dev, "%s: err_code: %#x\n", __func__, status);
- rc = -ENXIO;
- return rc;
+ return -ENXIO;
}
idxd->state = IDXD_DEV_CONF_READY;
return 0;
}
-int __idxd_device_reset(struct idxd_device *idxd)
+void idxd_device_reset(struct idxd_device *idxd)
{
- u32 status;
- int rc;
-
- rc = idxd_cmd_send(idxd, IDXD_CMD_RESET_DEVICE, 0);
- if (rc < 0)
- return rc;
- rc = idxd_cmd_wait(idxd, &status, IDXD_REG_TIMEOUT);
- if (rc < 0)
- return rc;
-
- return 0;
-}
-
-int idxd_device_reset(struct idxd_device *idxd)
-{
- unsigned long flags;
- int rc;
-
- spin_lock_irqsave(&idxd->dev_lock, flags);
- rc = __idxd_device_reset(idxd);
- spin_unlock_irqrestore(&idxd->dev_lock, flags);
- return rc;
+ idxd_cmd_exec(idxd, IDXD_CMD_RESET_DEVICE, 0, NULL);
}
/* Device configuration bits */
diff --git a/drivers/dma/idxd/dma.c b/drivers/dma/idxd/dma.c
index c64c1429d160..0c892cbd72e0 100644
--- a/drivers/dma/idxd/dma.c
+++ b/drivers/dma/idxd/dma.c
@@ -133,7 +133,7 @@ static enum dma_status idxd_dma_tx_status(struct dma_chan *dma_chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
- return dma_cookie_status(dma_chan, cookie, txstate);
+ return DMA_OUT_OF_ORDER;
}
/*
@@ -174,6 +174,7 @@ int idxd_register_dma_device(struct idxd_device *idxd)
INIT_LIST_HEAD(&dma->channels);
dma->dev = &idxd->pdev->dev;
+ dma_cap_set(DMA_COMPLETION_NO_ORDER, dma->cap_mask);
dma->device_release = idxd_dma_release;
if (idxd->hw.opcap.bits[0] & IDXD_OPCAP_MEMMOVE) {
diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
index 908c8d0ef3ab..e62b4799d189 100644
--- a/drivers/dma/idxd/idxd.h
+++ b/drivers/dma/idxd/idxd.h
@@ -104,7 +104,6 @@ struct idxd_wq {
enum idxd_wq_state state;
unsigned long flags;
union wqcfg wqcfg;
- atomic_t dq_count; /* dedicated queue flow control */
u32 vec_ptr; /* interrupt steering */
struct dsa_hw_desc **hw_descs;
int num_descs;
@@ -112,10 +111,8 @@ struct idxd_wq {
dma_addr_t compls_addr;
int compls_size;
struct idxd_desc **descs;
- struct sbitmap sbmap;
+ struct sbitmap_queue sbq;
struct dma_chan dma_chan;
- struct percpu_rw_semaphore submit_lock;
- wait_queue_head_t submit_waitq;
char name[WQ_NAME_SIZE + 1];
};
@@ -145,6 +142,7 @@ enum idxd_device_state {
enum idxd_device_flag {
IDXD_FLAG_CONFIGURABLE = 0,
+ IDXD_FLAG_CMD_RUNNING,
};
struct idxd_device {
@@ -161,6 +159,7 @@ struct idxd_device {
void __iomem *reg_base;
spinlock_t dev_lock; /* spinlock for device */
+ struct completion *cmd_done;
struct idxd_group *groups;
struct idxd_wq *wqs;
struct idxd_engine *engines;
@@ -183,12 +182,14 @@ struct idxd_device {
int nr_tokens; /* non-reserved tokens */
union sw_err_reg sw_err;
-
+ wait_queue_head_t cmd_waitq;
struct msix_entry *msix_entries;
int num_wq_irqs;
struct idxd_irq_entry *irq_entries;
struct dma_device dma_dev;
+ struct workqueue_struct *wq;
+ struct work_struct work;
};
/* IDXD software descriptor */
@@ -201,6 +202,7 @@ struct idxd_desc {
struct llist_node llnode;
struct list_head list;
int id;
+ int cpu;
struct idxd_wq *wq;
};
@@ -271,14 +273,14 @@ irqreturn_t idxd_wq_thread(int irq, void *data);
void idxd_mask_error_interrupts(struct idxd_device *idxd);
void idxd_unmask_error_interrupts(struct idxd_device *idxd);
void idxd_mask_msix_vectors(struct idxd_device *idxd);
-int idxd_mask_msix_vector(struct idxd_device *idxd, int vec_id);
-int idxd_unmask_msix_vector(struct idxd_device *idxd, int vec_id);
+void idxd_mask_msix_vector(struct idxd_device *idxd, int vec_id);
+void idxd_unmask_msix_vector(struct idxd_device *idxd, int vec_id);
/* device control */
+void idxd_device_init_reset(struct idxd_device *idxd);
int idxd_device_enable(struct idxd_device *idxd);
int idxd_device_disable(struct idxd_device *idxd);
-int idxd_device_reset(struct idxd_device *idxd);
-int __idxd_device_reset(struct idxd_device *idxd);
+void idxd_device_reset(struct idxd_device *idxd);
void idxd_device_cleanup(struct idxd_device *idxd);
int idxd_device_config(struct idxd_device *idxd);
void idxd_device_wqs_clear_state(struct idxd_device *idxd);
@@ -288,6 +290,7 @@ int idxd_wq_alloc_resources(struct idxd_wq *wq);
void idxd_wq_free_resources(struct idxd_wq *wq);
int idxd_wq_enable(struct idxd_wq *wq);
int idxd_wq_disable(struct idxd_wq *wq);
+void idxd_wq_drain(struct idxd_wq *wq);
int idxd_wq_map_portal(struct idxd_wq *wq);
void idxd_wq_unmap_portal(struct idxd_wq *wq);
void idxd_wq_disable_cleanup(struct idxd_wq *wq);
diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
index 7778c05deb5d..c7c61974f20f 100644
--- a/drivers/dma/idxd/init.c
+++ b/drivers/dma/idxd/init.c
@@ -141,22 +141,12 @@ static int idxd_setup_interrupts(struct idxd_device *idxd)
return rc;
}
-static void idxd_wqs_free_lock(struct idxd_device *idxd)
-{
- int i;
-
- for (i = 0; i < idxd->max_wqs; i++) {
- struct idxd_wq *wq = &idxd->wqs[i];
-
- percpu_free_rwsem(&wq->submit_lock);
- }
-}
-
static int idxd_setup_internals(struct idxd_device *idxd)
{
struct device *dev = &idxd->pdev->dev;
int i;
+ init_waitqueue_head(&idxd->cmd_waitq);
idxd->groups = devm_kcalloc(dev, idxd->max_groups,
sizeof(struct idxd_group), GFP_KERNEL);
if (!idxd->groups)
@@ -181,19 +171,11 @@ static int idxd_setup_internals(struct idxd_device *idxd)
for (i = 0; i < idxd->max_wqs; i++) {
struct idxd_wq *wq = &idxd->wqs[i];
- int rc;
wq->id = i;
wq->idxd = idxd;
mutex_init(&wq->wq_lock);
- atomic_set(&wq->dq_count, 0);
- init_waitqueue_head(&wq->submit_waitq);
wq->idxd_cdev.minor = -1;
- rc = percpu_init_rwsem(&wq->submit_lock);
- if (rc < 0) {
- idxd_wqs_free_lock(idxd);
- return rc;
- }
}
for (i = 0; i < idxd->max_engines; i++) {
@@ -201,6 +183,10 @@ static int idxd_setup_internals(struct idxd_device *idxd)
idxd->engines[i].id = i;
}
+ idxd->wq = create_workqueue(dev_name(dev));
+ if (!idxd->wq)
+ return -ENOMEM;
+
return 0;
}
@@ -296,9 +282,7 @@ static int idxd_probe(struct idxd_device *idxd)
int rc;
dev_dbg(dev, "%s entered and resetting device\n", __func__);
- rc = idxd_device_reset(idxd);
- if (rc < 0)
- return rc;
+ idxd_device_init_reset(idxd);
dev_dbg(dev, "IDXD reset complete\n");
idxd_read_caps(idxd);
@@ -433,11 +417,8 @@ static void idxd_shutdown(struct pci_dev *pdev)
int rc, i;
struct idxd_irq_entry *irq_entry;
int msixcnt = pci_msix_vec_count(pdev);
- unsigned long flags;
- spin_lock_irqsave(&idxd->dev_lock, flags);
rc = idxd_device_disable(idxd);
- spin_unlock_irqrestore(&idxd->dev_lock, flags);
if (rc)
dev_err(&pdev->dev, "Disabling device failed\n");
@@ -453,6 +434,8 @@ static void idxd_shutdown(struct pci_dev *pdev)
idxd_flush_pending_llist(irq_entry);
idxd_flush_work_list(irq_entry);
}
+
+ destroy_workqueue(idxd->wq);
}
static void idxd_remove(struct pci_dev *pdev)
@@ -462,7 +445,6 @@ static void idxd_remove(struct pci_dev *pdev)
dev_dbg(&pdev->dev, "%s called\n", __func__);
idxd_cleanup_sysfs(idxd);
idxd_shutdown(pdev);
- idxd_wqs_free_lock(idxd);
mutex_lock(&idxd_idr_lock);
idr_remove(&idxd_idrs[idxd->type], idxd->id);
mutex_unlock(&idxd_idr_lock);
diff --git a/drivers/dma/idxd/irq.c b/drivers/dma/idxd/irq.c
index 8a35f58da689..b5142556cc4e 100644
--- a/drivers/dma/idxd/irq.c
+++ b/drivers/dma/idxd/irq.c
@@ -23,16 +23,13 @@ void idxd_device_wqs_clear_state(struct idxd_device *idxd)
}
}
-static int idxd_restart(struct idxd_device *idxd)
+static void idxd_device_reinit(struct work_struct *work)
{
- int i, rc;
-
- lockdep_assert_held(&idxd->dev_lock);
-
- rc = __idxd_device_reset(idxd);
- if (rc < 0)
- goto out;
+ struct idxd_device *idxd = container_of(work, struct idxd_device, work);
+ struct device *dev = &idxd->pdev->dev;
+ int rc, i;
+ idxd_device_reset(idxd);
rc = idxd_device_config(idxd);
if (rc < 0)
goto out;
@@ -47,19 +44,16 @@ static int idxd_restart(struct idxd_device *idxd)
if (wq->state == IDXD_WQ_ENABLED) {
rc = idxd_wq_enable(wq);
if (rc < 0) {
- dev_warn(&idxd->pdev->dev,
- "Unable to re-enable wq %s\n",
+ dev_warn(dev, "Unable to re-enable wq %s\n",
dev_name(&wq->conf_dev));
}
}
}
- return 0;
+ return;
out:
idxd_device_wqs_clear_state(idxd);
- idxd->state = IDXD_DEV_HALTED;
- return rc;
}
irqreturn_t idxd_irq_handler(int vec, void *data)
@@ -78,7 +72,7 @@ irqreturn_t idxd_misc_thread(int vec, void *data)
struct device *dev = &idxd->pdev->dev;
union gensts_reg gensts;
u32 cause, val = 0;
- int i, rc;
+ int i;
bool err = false;
cause = ioread32(idxd->reg_base + IDXD_INTCAUSE_OFFSET);
@@ -117,8 +111,8 @@ irqreturn_t idxd_misc_thread(int vec, void *data)
}
if (cause & IDXD_INTC_CMD) {
- /* Driver does use command interrupts */
val |= IDXD_INTC_CMD;
+ complete(idxd->cmd_done);
}
if (cause & IDXD_INTC_OCCUPY) {
@@ -145,21 +139,24 @@ irqreturn_t idxd_misc_thread(int vec, void *data)
gensts.bits = ioread32(idxd->reg_base + IDXD_GENSTATS_OFFSET);
if (gensts.state == IDXD_DEVICE_STATE_HALT) {
- spin_lock_bh(&idxd->dev_lock);
+ idxd->state = IDXD_DEV_HALTED;
if (gensts.reset_type == IDXD_DEVICE_RESET_SOFTWARE) {
- rc = idxd_restart(idxd);
- if (rc < 0)
- dev_err(&idxd->pdev->dev,
- "idxd restart failed, device halt.");
+ /*
+ * If we need a software reset, we will throw the work
+ * on a system workqueue in order to allow interrupts
+ * for the device command completions.
+ */
+ INIT_WORK(&idxd->work, idxd_device_reinit);
+ queue_work(idxd->wq, &idxd->work);
} else {
+ spin_lock_bh(&idxd->dev_lock);
idxd_device_wqs_clear_state(idxd);
- idxd->state = IDXD_DEV_HALTED;
dev_err(&idxd->pdev->dev,
"idxd halted, need %s.\n",
gensts.reset_type == IDXD_DEVICE_RESET_FLR ?
"FLR" : "system reset");
+ spin_unlock_bh(&idxd->dev_lock);
}
- spin_unlock_bh(&idxd->dev_lock);
}
out:
@@ -264,8 +261,6 @@ irqreturn_t idxd_wq_thread(int irq, void *data)
processed = idxd_desc_process(irq_entry);
idxd_unmask_msix_vector(irq_entry->idxd, irq_entry->id);
- /* catch anything unprocessed after unmasking */
- processed += idxd_desc_process(irq_entry);
if (processed == 0)
return IRQ_NONE;
diff --git a/drivers/dma/idxd/submit.c b/drivers/dma/idxd/submit.c
index 45a0c5869a0a..156a1ee233aa 100644
--- a/drivers/dma/idxd/submit.c
+++ b/drivers/dma/idxd/submit.c
@@ -8,61 +8,61 @@
#include "idxd.h"
#include "registers.h"
-struct idxd_desc *idxd_alloc_desc(struct idxd_wq *wq, enum idxd_op_type optype)
+static struct idxd_desc *__get_desc(struct idxd_wq *wq, int idx, int cpu)
{
struct idxd_desc *desc;
- int idx;
+
+ desc = wq->descs[idx];
+ memset(desc->hw, 0, sizeof(struct dsa_hw_desc));
+ memset(desc->completion, 0, sizeof(struct dsa_completion_record));
+ desc->cpu = cpu;
+ return desc;
+}
+
+struct idxd_desc *idxd_alloc_desc(struct idxd_wq *wq, enum idxd_op_type optype)
+{
+ int cpu, idx;
struct idxd_device *idxd = wq->idxd;
+ DEFINE_SBQ_WAIT(wait);
+ struct sbq_wait_state *ws;
+ struct sbitmap_queue *sbq;
if (idxd->state != IDXD_DEV_ENABLED)
return ERR_PTR(-EIO);
- if (optype == IDXD_OP_BLOCK)
- percpu_down_read(&wq->submit_lock);
- else if (!percpu_down_read_trylock(&wq->submit_lock))
- return ERR_PTR(-EBUSY);
-
- if (!atomic_add_unless(&wq->dq_count, 1, wq->size)) {
- int rc;
-
- if (optype == IDXD_OP_NONBLOCK) {
- percpu_up_read(&wq->submit_lock);
+ sbq = &wq->sbq;
+ idx = sbitmap_queue_get(sbq, &cpu);
+ if (idx < 0) {
+ if (optype == IDXD_OP_NONBLOCK)
return ERR_PTR(-EAGAIN);
- }
-
- percpu_up_read(&wq->submit_lock);
- percpu_down_write(&wq->submit_lock);
- rc = wait_event_interruptible(wq->submit_waitq,
- atomic_add_unless(&wq->dq_count,
- 1, wq->size) ||
- idxd->state != IDXD_DEV_ENABLED);
- percpu_up_write(&wq->submit_lock);
- if (rc < 0)
- return ERR_PTR(-EINTR);
- if (idxd->state != IDXD_DEV_ENABLED)
- return ERR_PTR(-EIO);
} else {
- percpu_up_read(&wq->submit_lock);
+ return __get_desc(wq, idx, cpu);
}
- idx = sbitmap_get(&wq->sbmap, 0, false);
- if (idx < 0) {
- atomic_dec(&wq->dq_count);
- return ERR_PTR(-EAGAIN);
+ ws = &sbq->ws[0];
+ for (;;) {
+ sbitmap_prepare_to_wait(sbq, ws, &wait, TASK_INTERRUPTIBLE);
+ if (signal_pending_state(TASK_INTERRUPTIBLE, current))
+ break;
+ idx = sbitmap_queue_get(sbq, &cpu);
+ if (idx > 0)
+ break;
+ schedule();
}
- desc = wq->descs[idx];
- memset(desc->hw, 0, sizeof(struct dsa_hw_desc));
- memset(desc->completion, 0, sizeof(struct dsa_completion_record));
- return desc;
+ sbitmap_finish_wait(sbq, ws, &wait);
+ if (idx < 0)
+ return ERR_PTR(-EAGAIN);
+
+ return __get_desc(wq, idx, cpu);
}
void idxd_free_desc(struct idxd_wq *wq, struct idxd_desc *desc)
{
- atomic_dec(&wq->dq_count);
+ int cpu = desc->cpu;
- sbitmap_clear_bit(&wq->sbmap, desc->id);
- wake_up(&wq->submit_waitq);
+ desc->cpu = -1;
+ sbitmap_queue_clear(&wq->sbq, desc->id, cpu);
}
int idxd_submit_desc(struct idxd_wq *wq, struct idxd_desc *desc)
diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c
index 2e2c5082f322..dcba60953217 100644
--- a/drivers/dma/idxd/sysfs.c
+++ b/drivers/dma/idxd/sysfs.c
@@ -118,12 +118,11 @@ static int idxd_config_bus_probe(struct device *dev)
if (!try_module_get(THIS_MODULE))
return -ENXIO;
- spin_lock_irqsave(&idxd->dev_lock, flags);
-
/* Perform IDXD configuration and enabling */
+ spin_lock_irqsave(&idxd->dev_lock, flags);
rc = idxd_device_config(idxd);
+ spin_unlock_irqrestore(&idxd->dev_lock, flags);
if (rc < 0) {
- spin_unlock_irqrestore(&idxd->dev_lock, flags);
module_put(THIS_MODULE);
dev_warn(dev, "Device config failed: %d\n", rc);
return rc;
@@ -132,18 +131,15 @@ static int idxd_config_bus_probe(struct device *dev)
/* start device */
rc = idxd_device_enable(idxd);
if (rc < 0) {
- spin_unlock_irqrestore(&idxd->dev_lock, flags);
module_put(THIS_MODULE);
dev_warn(dev, "Device enable failed: %d\n", rc);
return rc;
}
- spin_unlock_irqrestore(&idxd->dev_lock, flags);
dev_info(dev, "Device %s enabled\n", dev_name(dev));
rc = idxd_register_dma_device(idxd);
if (rc < 0) {
- spin_unlock_irqrestore(&idxd->dev_lock, flags);
module_put(THIS_MODULE);
dev_dbg(dev, "Failed to register dmaengine device\n");
return rc;
@@ -188,8 +184,8 @@ static int idxd_config_bus_probe(struct device *dev)
spin_lock_irqsave(&idxd->dev_lock, flags);
rc = idxd_device_config(idxd);
+ spin_unlock_irqrestore(&idxd->dev_lock, flags);
if (rc < 0) {
- spin_unlock_irqrestore(&idxd->dev_lock, flags);
mutex_unlock(&wq->wq_lock);
dev_warn(dev, "Writing WQ %d config failed: %d\n",
wq->id, rc);
@@ -198,13 +194,11 @@ static int idxd_config_bus_probe(struct device *dev)
rc = idxd_wq_enable(wq);
if (rc < 0) {
- spin_unlock_irqrestore(&idxd->dev_lock, flags);
mutex_unlock(&wq->wq_lock);
dev_warn(dev, "WQ %d enabling failed: %d\n",
wq->id, rc);
return rc;
}
- spin_unlock_irqrestore(&idxd->dev_lock, flags);
rc = idxd_wq_map_portal(wq);
if (rc < 0) {
@@ -212,7 +206,6 @@ static int idxd_config_bus_probe(struct device *dev)
rc = idxd_wq_disable(wq);
if (rc < 0)
dev_warn(dev, "IDXD wq disable failed\n");
- spin_unlock_irqrestore(&idxd->dev_lock, flags);
mutex_unlock(&wq->wq_lock);
return rc;
}
@@ -248,7 +241,6 @@ static void disable_wq(struct idxd_wq *wq)
{
struct idxd_device *idxd = wq->idxd;
struct device *dev = &idxd->pdev->dev;
- unsigned long flags;
int rc;
mutex_lock(&wq->wq_lock);
@@ -269,9 +261,8 @@ static void disable_wq(struct idxd_wq *wq)
idxd_wq_unmap_portal(wq);
- spin_lock_irqsave(&idxd->dev_lock, flags);
+ idxd_wq_drain(wq);
rc = idxd_wq_disable(wq);
- spin_unlock_irqrestore(&idxd->dev_lock, flags);
idxd_wq_free_resources(wq);
wq->client_count = 0;
@@ -287,7 +278,6 @@ static void disable_wq(struct idxd_wq *wq)
static int idxd_config_bus_remove(struct device *dev)
{
int rc;
- unsigned long flags;
dev_dbg(dev, "%s called for %s\n", __func__, dev_name(dev));
@@ -313,14 +303,14 @@ static int idxd_config_bus_remove(struct device *dev)
}
idxd_unregister_dma_device(idxd);
- spin_lock_irqsave(&idxd->dev_lock, flags);
rc = idxd_device_disable(idxd);
for (i = 0; i < idxd->max_wqs; i++) {
struct idxd_wq *wq = &idxd->wqs[i];
+ mutex_lock(&wq->wq_lock);
idxd_wq_disable_cleanup(wq);
+ mutex_unlock(&wq->wq_lock);
}
- spin_unlock_irqrestore(&idxd->dev_lock, flags);
module_put(THIS_MODULE);
if (rc < 0)
dev_warn(dev, "Device disable failed\n");
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-04-28 04:28:52 +0000