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VMCI: dma dg: register dummy IRQ handlers for DMA datagrams 

Register dummy interrupt handlers for DMA datagrams in preparation for
DMA datagram receive operations.

Reviewed-by: Vishnu Dasa <vdasa@vmware.com>
Signed-off-by: Jorgen Hansen <jhansen@vmware.com>
Link: https://lore.kernel.org/r/20220207102725.2742-6-jhansen@vmware.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jorgen Hansen 2022-02-07 02:27:22 -08:00 committed by Greg Kroah-Hartman
parent 8cb520bea1
commit cc68f2177f
2 changed files with 51 additions and 5 deletions
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40
drivers/misc/vmw_vmci/vmci_guest.c
View File

@ -414,6 +414,9 @@ static irqreturn_t vmci_interrupt(int irq, void *_dev)
icr &= ~VMCI_ICR_NOTIFICATION;
}
if (icr & VMCI_ICR_DMA_DATAGRAM)
icr &= ~VMCI_ICR_DMA_DATAGRAM;
if (icr != 0)
dev_warn(dev->dev,
"Ignoring unknown interrupt cause (%d)\n",
@ -438,6 +441,16 @@ static irqreturn_t vmci_interrupt_bm(int irq, void *_dev)
return IRQ_HANDLED;
}
/*
* Interrupt handler for MSI-X interrupt vector VMCI_INTR_DMA_DATAGRAM,
* which is for the completion of a DMA datagram send or receive operation.
* Will only get called if we are using MSI-X with exclusive vectors.
*/
static irqreturn_t vmci_interrupt_dma_datagram(int irq, void *_dev)
{
return IRQ_HANDLED;
}
/*
* Most of the initialization at module load time is done here.
*/
@ -447,6 +460,7 @@ static int vmci_guest_probe_device(struct pci_dev *pdev,
struct vmci_guest_device *vmci_dev;
void __iomem *iobase = NULL;
void __iomem *mmio_base = NULL;
unsigned int num_irq_vectors;
unsigned int capabilities;
unsigned int caps_in_use;
unsigned long cmd;
@ -627,7 +641,11 @@ static int vmci_guest_probe_device(struct pci_dev *pdev,
* Enable interrupts. Try MSI-X first, then MSI, and then fallback on
* legacy interrupts.
*/
error = pci_alloc_irq_vectors(pdev, VMCI_MAX_INTRS, VMCI_MAX_INTRS,
if (vmci_dev->mmio_base != NULL)
num_irq_vectors = VMCI_MAX_INTRS;
else
num_irq_vectors = VMCI_MAX_INTRS_NOTIFICATION;
error = pci_alloc_irq_vectors(pdev, num_irq_vectors, num_irq_vectors,
PCI_IRQ_MSIX);
if (error < 0) {
error = pci_alloc_irq_vectors(pdev, 1, 1,
@ -666,6 +684,17 @@ static int vmci_guest_probe_device(struct pci_dev *pdev,
pci_irq_vector(pdev, 1), error);
goto err_free_irq;
}
if (caps_in_use & VMCI_CAPS_DMA_DATAGRAM) {
error = request_irq(pci_irq_vector(pdev, 2),
vmci_interrupt_dma_datagram,
0, KBUILD_MODNAME, vmci_dev);
if (error) {
dev_err(&pdev->dev,
"Failed to allocate irq %u: %d\n",
pci_irq_vector(pdev, 2), error);
goto err_free_bm_irq;
}
}
}
dev_dbg(&pdev->dev, "Registered device\n");
@ -676,6 +705,8 @@ static int vmci_guest_probe_device(struct pci_dev *pdev,
cmd = VMCI_IMR_DATAGRAM;
if (caps_in_use & VMCI_CAPS_NOTIFICATIONS)
cmd |= VMCI_IMR_NOTIFICATION;
if (caps_in_use & VMCI_CAPS_DMA_DATAGRAM)
cmd |= VMCI_IMR_DMA_DATAGRAM;
vmci_write_reg(vmci_dev, cmd, VMCI_IMR_ADDR);
/* Enable interrupts. */
@ -686,6 +717,8 @@ static int vmci_guest_probe_device(struct pci_dev *pdev,
vmci_call_vsock_callback(false);
return 0;
err_free_bm_irq:
free_irq(pci_irq_vector(pdev, 1), vmci_dev);
err_free_irq:
free_irq(pci_irq_vector(pdev, 0), vmci_dev);
tasklet_kill(&vmci_dev->datagram_tasklet);
@ -751,8 +784,11 @@ static void vmci_guest_remove_device(struct pci_dev *pdev)
* MSI-X, we might have multiple vectors, each with their own
* IRQ, which we must free too.
*/
if (vmci_dev->exclusive_vectors)
if (vmci_dev->exclusive_vectors) {
free_irq(pci_irq_vector(pdev, 1), vmci_dev);
if (vmci_dev->mmio_base != NULL)
free_irq(pci_irq_vector(pdev, 2), vmci_dev);
}
free_irq(pci_irq_vector(pdev, 0), vmci_dev);
pci_free_irq_vectors(pdev);

14
include/linux/vmw_vmci_defs.h
View File

@ -45,13 +45,22 @@
/* Interrupt Cause register bits. */
#define VMCI_ICR_DATAGRAM BIT(0)
#define VMCI_ICR_NOTIFICATION BIT(1)
#define VMCI_ICR_DMA_DATAGRAM BIT(2)
/* Interrupt Mask register bits. */
#define VMCI_IMR_DATAGRAM BIT(0)
#define VMCI_IMR_NOTIFICATION BIT(1)
#define VMCI_IMR_DMA_DATAGRAM BIT(2)
/* Maximum MSI/MSI-X interrupt vectors in the device. */
#define VMCI_MAX_INTRS 2
/*
* Maximum MSI/MSI-X interrupt vectors in the device.
* If VMCI_CAPS_DMA_DATAGRAM is supported by the device,
* VMCI_MAX_INTRS_DMA_DATAGRAM vectors are available,
* otherwise only VMCI_MAX_INTRS_NOTIFICATION.
*/
#define VMCI_MAX_INTRS_NOTIFICATION 2
#define VMCI_MAX_INTRS_DMA_DATAGRAM 3
#define VMCI_MAX_INTRS VMCI_MAX_INTRS_DMA_DATAGRAM
/*
* Supported interrupt vectors. There is one for each ICR value above,
@ -60,6 +69,7 @@
enum {
VMCI_INTR_DATAGRAM = 0,
VMCI_INTR_NOTIFICATION = 1,
VMCI_INTR_DMA_DATAGRAM = 2,
};
/*