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-rw-r--r--drivers/dma/idxd/device.c71
-rw-r--r--drivers/dma/idxd/idxd.h13
-rw-r--r--drivers/dma/idxd/init.c56
-rw-r--r--drivers/dma/idxd/registers.h9
-rw-r--r--drivers/dma/idxd/submit.c35
-rw-r--r--drivers/dma/idxd/sysfs.c1
6 files changed, 176 insertions, 9 deletions
diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
index 3ddb1c731080..54d5afec81cf 100644
--- a/drivers/dma/idxd/device.c
+++ b/drivers/dma/idxd/device.c
@@ -598,6 +598,77 @@ void idxd_device_drain_pasid(struct idxd_device *idxd, int pasid)
dev_dbg(dev, "pasid %d drained\n", pasid);
}
+int idxd_device_request_int_handle(struct idxd_device *idxd, int idx, int *handle,
+ enum idxd_interrupt_type irq_type)
+{
+ struct device *dev = &idxd->pdev->dev;
+ u32 operand, status;
+
+ if (!(idxd->hw.cmd_cap & BIT(IDXD_CMD_REQUEST_INT_HANDLE)))
+ return -EOPNOTSUPP;
+
+ dev_dbg(dev, "get int handle, idx %d\n", idx);
+
+ operand = idx & GENMASK(15, 0);
+ if (irq_type == IDXD_IRQ_IMS)
+ operand |= CMD_INT_HANDLE_IMS;
+
+ dev_dbg(dev, "cmd: %u operand: %#x\n", IDXD_CMD_REQUEST_INT_HANDLE, operand);
+
+ idxd_cmd_exec(idxd, IDXD_CMD_REQUEST_INT_HANDLE, operand, &status);
+
+ if ((status & IDXD_CMDSTS_ERR_MASK) != IDXD_CMDSTS_SUCCESS) {
+ dev_dbg(dev, "request int handle failed: %#x\n", status);
+ return -ENXIO;
+ }
+
+ *handle = (status >> IDXD_CMDSTS_RES_SHIFT) & GENMASK(15, 0);
+
+ dev_dbg(dev, "int handle acquired: %u\n", *handle);
+ return 0;
+}
+
+int idxd_device_release_int_handle(struct idxd_device *idxd, int handle,
+ enum idxd_interrupt_type irq_type)
+{
+ struct device *dev = &idxd->pdev->dev;
+ u32 operand, status;
+ union idxd_command_reg cmd;
+ unsigned long flags;
+
+ if (!(idxd->hw.cmd_cap & BIT(IDXD_CMD_RELEASE_INT_HANDLE)))
+ return -EOPNOTSUPP;
+
+ dev_dbg(dev, "release int handle, handle %d\n", handle);
+
+ memset(&cmd, 0, sizeof(cmd));
+ operand = handle & GENMASK(15, 0);
+
+ if (irq_type == IDXD_IRQ_IMS)
+ operand |= CMD_INT_HANDLE_IMS;
+
+ cmd.cmd = IDXD_CMD_RELEASE_INT_HANDLE;
+ cmd.operand = operand;
+
+ dev_dbg(dev, "cmd: %u operand: %#x\n", IDXD_CMD_RELEASE_INT_HANDLE, operand);
+
+ spin_lock_irqsave(&idxd->dev_lock, flags);
+ iowrite32(cmd.bits, idxd->reg_base + IDXD_CMD_OFFSET);
+
+ while (ioread32(idxd->reg_base + IDXD_CMDSTS_OFFSET) & IDXD_CMDSTS_ACTIVE)
+ cpu_relax();
+ status = ioread32(idxd->reg_base + IDXD_CMDSTS_OFFSET);
+ spin_unlock_irqrestore(&idxd->dev_lock, flags);
+
+ if ((status & IDXD_CMDSTS_ERR_MASK) != IDXD_CMDSTS_SUCCESS) {
+ dev_dbg(dev, "release int handle failed: %#x\n", status);
+ return -ENXIO;
+ }
+
+ dev_dbg(dev, "int handle released.\n");
+ return 0;
+}
+
/* Device configuration bits */
void idxd_msix_perm_setup(struct idxd_device *idxd)
{
diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
index 940a2e1ddf12..c1d4a1976206 100644
--- a/drivers/dma/idxd/idxd.h
+++ b/drivers/dma/idxd/idxd.h
@@ -160,6 +160,7 @@ struct idxd_hw {
union group_cap_reg group_cap;
union engine_cap_reg engine_cap;
struct opcap opcap;
+ u32 cmd_cap;
};
enum idxd_device_state {
@@ -237,6 +238,8 @@ struct idxd_device {
struct idxd_dma_dev *idxd_dma;
struct workqueue_struct *wq;
struct work_struct work;
+
+ int *int_handles;
};
/* IDXD software descriptor */
@@ -256,6 +259,7 @@ struct idxd_desc {
struct list_head list;
int id;
int cpu;
+ unsigned int vector;
struct idxd_wq *wq;
};
@@ -330,6 +334,11 @@ enum idxd_portal_prot {
IDXD_PORTAL_LIMITED,
};
+enum idxd_interrupt_type {
+ IDXD_IRQ_MSIX = 0,
+ IDXD_IRQ_IMS,
+};
+
static inline int idxd_get_wq_portal_offset(enum idxd_portal_prot prot)
{
return prot * 0x1000;
@@ -385,6 +394,10 @@ int idxd_device_config(struct idxd_device *idxd);
void idxd_device_wqs_clear_state(struct idxd_device *idxd);
void idxd_device_drain_pasid(struct idxd_device *idxd, int pasid);
int idxd_device_load_config(struct idxd_device *idxd);
+int idxd_device_request_int_handle(struct idxd_device *idxd, int idx, int *handle,
+ enum idxd_interrupt_type irq_type);
+int idxd_device_release_int_handle(struct idxd_device *idxd, int handle,
+ enum idxd_interrupt_type irq_type);
/* work queue control */
int idxd_wq_alloc_resources(struct idxd_wq *wq);
diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
index a07e6d8eec00..ef58750c24cc 100644
--- a/drivers/dma/idxd/init.c
+++ b/drivers/dma/idxd/init.c
@@ -125,7 +125,25 @@ static int idxd_setup_interrupts(struct idxd_device *idxd)
dev_err(dev, "Failed to allocate irq %d.\n", irq_entry->vector);
goto err_wq_irqs;
}
+
dev_dbg(dev, "Allocated idxd-msix %d for vector %d\n", i, irq_entry->vector);
+ if (idxd->hw.cmd_cap & BIT(IDXD_CMD_REQUEST_INT_HANDLE)) {
+ /*
+ * The MSIX vector enumeration starts at 1 with vector 0 being the
+ * misc interrupt that handles non I/O completion events. The
+ * interrupt handles are for IMS enumeration on guest. The misc
+ * interrupt vector does not require a handle and therefore we start
+ * the int_handles at index 0. Since 'i' starts at 1, the first
+ * int_handles index will be 0.
+ */
+ rc = idxd_device_request_int_handle(idxd, i, &idxd->int_handles[i - 1],
+ IDXD_IRQ_MSIX);
+ if (rc < 0) {
+ free_irq(irq_entry->vector, irq_entry);
+ goto err_wq_irqs;
+ }
+ dev_dbg(dev, "int handle requested: %u\n", idxd->int_handles[i - 1]);
+ }
}
idxd_unmask_error_interrupts(idxd);
@@ -136,6 +154,9 @@ static int idxd_setup_interrupts(struct idxd_device *idxd)
while (--i >= 0) {
irq_entry = &idxd->irq_entries[i];
free_irq(irq_entry->vector, irq_entry);
+ if (i != 0)
+ idxd_device_release_int_handle(idxd,
+ idxd->int_handles[i], IDXD_IRQ_MSIX);
}
err_misc_irq:
/* Disable error interrupt generation */
@@ -288,9 +309,15 @@ static int idxd_setup_internals(struct idxd_device *idxd)
init_waitqueue_head(&idxd->cmd_waitq);
+ if (idxd->hw.cmd_cap & BIT(IDXD_CMD_REQUEST_INT_HANDLE)) {
+ idxd->int_handles = devm_kcalloc(dev, idxd->max_wqs, sizeof(int), GFP_KERNEL);
+ if (!idxd->int_handles)
+ return -ENOMEM;
+ }
+
rc = idxd_setup_wqs(idxd);
if (rc < 0)
- return rc;
+ goto err_wqs;
rc = idxd_setup_engines(idxd);
if (rc < 0)
@@ -317,6 +344,8 @@ static int idxd_setup_internals(struct idxd_device *idxd)
err_engine:
for (i = 0; i < idxd->max_wqs; i++)
put_device(&idxd->wqs[i]->conf_dev);
+ err_wqs:
+ kfree(idxd->int_handles);
return rc;
}
@@ -345,6 +374,12 @@ static void idxd_read_caps(struct idxd_device *idxd)
/* reading generic capabilities */
idxd->hw.gen_cap.bits = ioread64(idxd->reg_base + IDXD_GENCAP_OFFSET);
dev_dbg(dev, "gen_cap: %#llx\n", idxd->hw.gen_cap.bits);
+
+ if (idxd->hw.gen_cap.cmd_cap) {
+ idxd->hw.cmd_cap = ioread32(idxd->reg_base + IDXD_CMDCAP_OFFSET);
+ dev_dbg(dev, "cmd_cap: %#x\n", idxd->hw.cmd_cap);
+ }
+
idxd->max_xfer_bytes = 1ULL << idxd->hw.gen_cap.max_xfer_shift;
dev_dbg(dev, "max xfer size: %llu bytes\n", idxd->max_xfer_bytes);
idxd->max_batch_size = 1U << idxd->hw.gen_cap.max_batch_shift;
@@ -604,6 +639,24 @@ static void idxd_flush_work_list(struct idxd_irq_entry *ie)
}
}
+static void idxd_release_int_handles(struct idxd_device *idxd)
+{
+ struct device *dev = &idxd->pdev->dev;
+ int i, rc;
+
+ for (i = 0; i < idxd->num_wq_irqs; i++) {
+ if (idxd->hw.cmd_cap & BIT(IDXD_CMD_RELEASE_INT_HANDLE)) {
+ rc = idxd_device_release_int_handle(idxd, idxd->int_handles[i],
+ IDXD_IRQ_MSIX);
+ if (rc < 0)
+ dev_warn(dev, "irq handle %d release failed\n",
+ idxd->int_handles[i]);
+ else
+ dev_dbg(dev, "int handle requested: %u\n", idxd->int_handles[i]);
+ }
+ }
+}
+
static void idxd_shutdown(struct pci_dev *pdev)
{
struct idxd_device *idxd = pci_get_drvdata(pdev);
@@ -630,6 +683,7 @@ static void idxd_shutdown(struct pci_dev *pdev)
}
idxd_msix_perm_clear(idxd);
+ idxd_release_int_handles(idxd);
pci_free_irq_vectors(pdev);
pci_iounmap(pdev, idxd->reg_base);
pci_disable_device(pdev);
diff --git a/drivers/dma/idxd/registers.h b/drivers/dma/idxd/registers.h
index 751ecb4f9f81..5cbf368c7367 100644
--- a/drivers/dma/idxd/registers.h
+++ b/drivers/dma/idxd/registers.h
@@ -24,8 +24,8 @@ union gen_cap_reg {
u64 overlap_copy:1;
u64 cache_control_mem:1;
u64 cache_control_cache:1;
+ u64 cmd_cap:1;
u64 rsvd:3;
- u64 int_handle_req:1;
u64 dest_readback:1;
u64 drain_readback:1;
u64 rsvd2:6;
@@ -180,8 +180,11 @@ enum idxd_cmd {
IDXD_CMD_DRAIN_PASID,
IDXD_CMD_ABORT_PASID,
IDXD_CMD_REQUEST_INT_HANDLE,
+ IDXD_CMD_RELEASE_INT_HANDLE,
};
+#define CMD_INT_HANDLE_IMS 0x10000
+
#define IDXD_CMDSTS_OFFSET 0xa8
union cmdsts_reg {
struct {
@@ -193,6 +196,8 @@ union cmdsts_reg {
u32 bits;
} __packed;
#define IDXD_CMDSTS_ACTIVE 0x80000000
+#define IDXD_CMDSTS_ERR_MASK 0xff
+#define IDXD_CMDSTS_RES_SHIFT 8
enum idxd_cmdsts_err {
IDXD_CMDSTS_SUCCESS = 0,
@@ -228,6 +233,8 @@ enum idxd_cmdsts_err {
IDXD_CMDSTS_ERR_NO_HANDLE,
};
+#define IDXD_CMDCAP_OFFSET 0xb0
+
#define IDXD_SWERR_OFFSET 0xc0
#define IDXD_SWERR_VALID 0x00000001
#define IDXD_SWERR_OVERFLOW 0x00000002
diff --git a/drivers/dma/idxd/submit.c b/drivers/dma/idxd/submit.c
index 02f9f51e29a6..19afb62abaff 100644
--- a/drivers/dma/idxd/submit.c
+++ b/drivers/dma/idxd/submit.c
@@ -22,11 +22,23 @@ static struct idxd_desc *__get_desc(struct idxd_wq *wq, int idx, int cpu)
desc->hw->pasid = idxd->pasid;
/*
- * Descriptor completion vectors are 1-8 for MSIX. We will round
- * robin through the 8 vectors.
+ * Descriptor completion vectors are 1...N for MSIX. We will round
+ * robin through the N vectors.
*/
wq->vec_ptr = (wq->vec_ptr % idxd->num_wq_irqs) + 1;
- desc->hw->int_handle = wq->vec_ptr;
+ if (!idxd->int_handles) {
+ desc->hw->int_handle = wq->vec_ptr;
+ } else {
+ desc->vector = wq->vec_ptr;
+ /*
+ * int_handles are only for descriptor completion. However for device
+ * MSIX enumeration, vec 0 is used for misc interrupts. Therefore even
+ * though we are rotating through 1...N for descriptor interrupts, we
+ * need to acqurie the int_handles from 0..N-1.
+ */
+ desc->hw->int_handle = idxd->int_handles[desc->vector - 1];
+ }
+
return desc;
}
@@ -79,7 +91,6 @@ void idxd_free_desc(struct idxd_wq *wq, struct idxd_desc *desc)
int idxd_submit_desc(struct idxd_wq *wq, struct idxd_desc *desc)
{
struct idxd_device *idxd = wq->idxd;
- int vec = desc->hw->int_handle;
void __iomem *portal;
int rc;
@@ -117,9 +128,19 @@ int idxd_submit_desc(struct idxd_wq *wq, struct idxd_desc *desc)
* Pending the descriptor to the lockless list for the irq_entry
* that we designated the descriptor to.
*/
- if (desc->hw->flags & IDXD_OP_FLAG_RCI)
- llist_add(&desc->llnode,
- &idxd->irq_entries[vec].pending_llist);
+ if (desc->hw->flags & IDXD_OP_FLAG_RCI) {
+ int vec;
+
+ /*
+ * If the driver is on host kernel, it would be the value
+ * assigned to interrupt handle, which is index for MSIX
+ * vector. If it's guest then can't use the int_handle since
+ * that is the index to IMS for the entire device. The guest
+ * device local index will be used.
+ */
+ vec = !idxd->int_handles ? desc->hw->int_handle : desc->vector;
+ llist_add(&desc->llnode, &idxd->irq_entries[vec].pending_llist);
+ }
return 0;
}
diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c
index d45cb61f300b..3f4ea4d0fae7 100644
--- a/drivers/dma/idxd/sysfs.c
+++ b/drivers/dma/idxd/sysfs.c
@@ -1600,6 +1600,7 @@ static void idxd_conf_device_release(struct device *dev)
kfree(idxd->wqs);
kfree(idxd->engines);
kfree(idxd->irq_entries);
+ kfree(idxd->int_handles);
ida_free(&idxd_ida, idxd->id);
kfree(idxd);
}
generated by cgit v1.2.3 (git 2.39.0) at 2024-09-08 07:48:50 +0300