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Implement pci_enable_msi() and pci_disable_msi() in the LinuxKPI.

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This patch makes the DRM graphics driver in ports usable on aarch64.

Submitted by:	Greg V <greg@unrelenting.technology>
Differential Revision:	https://reviews.freebsd.org/D21008
MFC after:	1 week
Sponsored by:	Mellanox Technologies
This commit is contained in:
Hans Petter Selasky 2019-08-14 09:36:25 +00:00
parent 0e8ead2816
commit 4f109faadc
3 changed files with 54 additions and 10 deletions
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4
sys/compat/linuxkpi/common/include/linux/device.h
View file

@ -110,8 +110,8 @@ struct device {
void *driver_data;
unsigned int irq;
#define LINUX_IRQ_INVALID 65535
unsigned int msix;
unsigned int msix_max;
unsigned int irq_start;
unsigned int irq_end;
const struct attribute_group **groups;
struct fwnode_handle *fwnode;

6
sys/compat/linuxkpi/common/include/linux/interrupt.h
View file

@ -55,9 +55,11 @@ struct irq_ent {
static inline int
linux_irq_rid(struct device *dev, unsigned int irq)
{
if (irq == dev->irq)
/* check for MSI- or MSIX- interrupt */
if (irq >= dev->irq_start && irq < dev->irq_end)
return (irq - dev->irq_start + 1);
else
return (0);
return irq - dev->msix + 1;
}
extern void linux_irq_handler(void *);

54
sys/compat/linuxkpi/common/include/linux/pci.h
View file

@ -228,6 +228,7 @@ struct pci_dev {
unsigned int devfn;
uint32_t class;
uint8_t revision;
bool msi_enabled;
};
static inline struct resource_list_entry *
@ -262,7 +263,7 @@ linux_pci_find_irq_dev(unsigned int irq)
spin_lock(&pci_lock);
list_for_each_entry(pdev, &pci_devices, links) {
if (irq == pdev->dev.irq ||
(irq >= pdev->dev.msix && irq < pdev->dev.msix_max)) {
(irq >= pdev->dev.irq_start && irq < pdev->dev.irq_end)) {
found = &pdev->dev;
break;
}
@ -424,8 +425,23 @@ pci_disable_msix(struct pci_dev *pdev)
* linux_pci_find_irq_dev() does no longer see them by
* resetting their references to zero:
*/
pdev->dev.msix = 0;
pdev->dev.msix_max = 0;
pdev->dev.irq_start = 0;
pdev->dev.irq_end = 0;
}
#define pci_disable_msi(pdev) \
linux_pci_disable_msi(pdev)
static inline void
linux_pci_disable_msi(struct pci_dev *pdev)
{
pci_release_msi(pdev->dev.bsddev);
pdev->dev.irq_start = 0;
pdev->dev.irq_end = 0;
pdev->irq = pdev->dev.irq;
pdev->msi_enabled = false;
}
unsigned long pci_resource_start(struct pci_dev *pdev, int bar);
@ -562,10 +578,10 @@ pci_enable_msix(struct pci_dev *pdev, struct msix_entry *entries, int nreq)
return avail;
}
rle = linux_pci_get_rle(pdev, SYS_RES_IRQ, 1);
pdev->dev.msix = rle->start;
pdev->dev.msix_max = rle->start + avail;
pdev->dev.irq_start = rle->start;
pdev->dev.irq_end = rle->start + avail;
for (i = 0; i < nreq; i++)
entries[i].vector = pdev->dev.msix + i;
entries[i].vector = pdev->dev.irq_start + i;
return (0);
}
@ -595,6 +611,32 @@ pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
return (nvec);
}
#define pci_enable_msi(pdev) \
linux_pci_enable_msi(pdev)
static inline int
pci_enable_msi(struct pci_dev *pdev)
{
struct resource_list_entry *rle;
int error;
int avail;
avail = pci_msi_count(pdev->dev.bsddev);
if (avail < 1)
return -EINVAL;
avail = 1; /* this function only enable one MSI IRQ */
if ((error = -pci_alloc_msi(pdev->dev.bsddev, &avail)) != 0)
return error;
rle = linux_pci_get_rle(pdev, SYS_RES_IRQ, 1);
pdev->dev.irq_start = rle->start;
pdev->dev.irq_end = rle->start + avail;
pdev->irq = rle->start;
pdev->msi_enabled = true;
return (0);
}
static inline int
pci_channel_offline(struct pci_dev *pdev)
{