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Message-ID: <20240610093149.20640-13-pstanner@redhat.com>
Date: Mon, 10 Jun 2024 11:31:34 +0200
From: Philipp Stanner <pstanner@...hat.com>
To: Hans de Goede <hdegoede@...hat.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Sam Ravnborg <sam@...nborg.org>,
dakr@...hat.com
Cc: dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org,
linux-pci@...r.kernel.org,
Philipp Stanner <pstanner@...hat.com>
Subject: [PATCH v8 12/13] PCI: Add pcim_iomap_range()
The only managed mapping function currently is pcim_iomap() which
doesn't allow for mapping an area starting at a certain offset, which
many drivers want.
Add pcim_iomap_range() as an exported function.
Signed-off-by: Philipp Stanner <pstanner@...hat.com>
---
drivers/pci/devres.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/pci.h | 2 ++
2 files changed, 46 insertions(+)
diff --git a/drivers/pci/devres.c b/drivers/pci/devres.c
index e92a8802832f..96f18243742b 100644
--- a/drivers/pci/devres.c
+++ b/drivers/pci/devres.c
@@ -1015,3 +1015,47 @@ void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
}
}
EXPORT_SYMBOL(pcim_iounmap_regions);
+
+/**
+ * pcim_iomap_range - Create a ranged __iomap mapping within a PCI BAR
+ * @pdev: PCI device to map IO resources for
+ * @bar: Index of the BAR
+ * @offset: Offset from the begin of the BAR
+ * @len: Length in bytes for the mapping
+ *
+ * Returns: __iomem pointer on success, an IOMEM_ERR_PTR on failure.
+ *
+ * Creates a new IO-Mapping within the specified @bar, ranging from @offset to
+ * @offset + @len.
+ *
+ * The mapping will automatically get unmapped on driver detach. If desired,
+ * release manually only with pcim_iounmap().
+ */
+void __iomem *pcim_iomap_range(struct pci_dev *pdev, int bar,
+ unsigned long offset, unsigned long len)
+{
+ void __iomem *mapping;
+ struct pcim_addr_devres *res;
+
+ res = pcim_addr_devres_alloc(pdev);
+ if (!res)
+ return IOMEM_ERR_PTR(-ENOMEM);
+
+ mapping = pci_iomap_range(pdev, bar, offset, len);
+ if (!mapping) {
+ pcim_addr_devres_free(res);
+ return IOMEM_ERR_PTR(-EINVAL);
+ }
+
+ res->type = PCIM_ADDR_DEVRES_TYPE_MAPPING;
+ res->baseaddr = mapping;
+
+ /*
+ * Ranged mappings don't get added to the legacy-table, since the table
+ * only ever keeps track of whole BARs.
+ */
+
+ devres_add(&pdev->dev, res);
+ return mapping;
+}
+EXPORT_SYMBOL(pcim_iomap_range);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index cc9247f78158..bee1b2754219 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -2304,6 +2304,8 @@ int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name);
int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
const char *name);
void pcim_iounmap_regions(struct pci_dev *pdev, int mask);
+void __iomem *pcim_iomap_range(struct pci_dev *pdev, int bar,
+ unsigned long offset, unsigned long len);
extern int pci_pci_problems;
#define PCIPCI_FAIL 1 /* No PCI PCI DMA */
--
2.45.0
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