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Message-Id: <20210426190346.173919-1-firas.ashkar@savoirfairelinux.com>
Date: Mon, 26 Apr 2021 15:03:46 -0400
From: Firas Ashkar <firas.ashkar@...oirfairelinux.com>
To: gregkh@...uxfoundation.org, mst@...hat.com
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] uio: uio_pci_generic: add memory mappings
import memory resources from underlying pci device, thus allowing
userspace applications to memory map those resources.
Signed-off-by: Firas Ashkar <firas.ashkar@...oirfairelinux.com>
---
:100644 100644 c7d681fef198 809eca95b5bb M drivers/uio/uio_pci_generic.c
drivers/uio/uio_pci_generic.c | 52 +++++++++++++++++++++++++++++------
1 file changed, 43 insertions(+), 9 deletions(-)
diff --git a/drivers/uio/uio_pci_generic.c b/drivers/uio/uio_pci_generic.c
index c7d681fef198..809eca95b5bb 100644
--- a/drivers/uio/uio_pci_generic.c
+++ b/drivers/uio/uio_pci_generic.c
@@ -24,9 +24,9 @@
#include <linux/slab.h>
#include <linux/uio_driver.h>
-#define DRIVER_VERSION "0.01.0"
-#define DRIVER_AUTHOR "Michael S. Tsirkin <mst@...hat.com>"
-#define DRIVER_DESC "Generic UIO driver for PCI 2.3 devices"
+#define DRIVER_VERSION "0.01.0"
+#define DRIVER_AUTHOR "Michael S. Tsirkin <mst@...hat.com>"
+#define DRIVER_DESC "Generic UIO driver for PCI 2.3 devices"
struct uio_pci_generic_dev {
struct uio_info info;
@@ -56,7 +56,8 @@ static int release(struct uio_info *info, struct inode *inode)
}
/* Interrupt handler. Read/modify/write the command register to disable
- * the interrupt. */
+ * the interrupt.
+ */
static irqreturn_t irqhandler(int irq, struct uio_info *info)
{
struct uio_pci_generic_dev *gdev = to_uio_pci_generic_dev(info);
@@ -68,11 +69,12 @@ static irqreturn_t irqhandler(int irq, struct uio_info *info)
return IRQ_HANDLED;
}
-static int probe(struct pci_dev *pdev,
- const struct pci_device_id *id)
+static int probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct uio_pci_generic_dev *gdev;
+ struct uio_mem *uiomem;
int err;
+ int i;
err = pcim_enable_device(pdev);
if (err) {
@@ -84,7 +86,8 @@ static int probe(struct pci_dev *pdev,
if (pdev->irq && !pci_intx_mask_supported(pdev))
return -ENOMEM;
- gdev = devm_kzalloc(&pdev->dev, sizeof(struct uio_pci_generic_dev), GFP_KERNEL);
+ gdev = devm_kzalloc(&pdev->dev, sizeof(struct uio_pci_generic_dev),
+ GFP_KERNEL);
if (!gdev)
return -ENOMEM;
@@ -97,8 +100,39 @@ static int probe(struct pci_dev *pdev,
gdev->info.irq_flags = IRQF_SHARED;
gdev->info.handler = irqhandler;
} else {
- dev_warn(&pdev->dev, "No IRQ assigned to device: "
- "no support for interrupts?\n");
+ dev_warn(
+ &pdev->dev,
+ "No IRQ assigned to device: no support for interrupts?\n");
+ }
+
+ uiomem = &gdev->info.mem[0];
+ for (i = 0; i < MAX_UIO_MAPS; ++i) {
+ struct resource *r = &pdev->resource[i];
+
+ if (r->flags != (IORESOURCE_SIZEALIGN | IORESOURCE_MEM))
+ continue;
+
+ if (uiomem >= &gdev->info.mem[MAX_UIO_MAPS]) {
+ dev_warn(
+ &pdev->dev,
+ "device has more than " __stringify(
+ MAX_UIO_MAPS) " I/O memory resources.\n");
+ break;
+ }
+
+ uiomem->memtype = UIO_MEM_PHYS;
+ uiomem->addr = r->start & PAGE_MASK;
+ uiomem->offs = r->start & ~PAGE_MASK;
+ uiomem->size =
+ (uiomem->offs + resource_size(r) + PAGE_SIZE - 1) &
+ PAGE_MASK;
+ uiomem->name = r->name;
+ ++uiomem;
+ }
+
+ while (uiomem < &gdev->info.mem[MAX_UIO_MAPS]) {
+ uiomem->size = 0;
+ ++uiomem;
}
return devm_uio_register_device(&pdev->dev, &gdev->info);
--
2.25.1
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