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hw/display/qxl: Document qxl_phys2virt()

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Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20221128202741.4945-3-philmd@linaro.org>
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Philippe Mathieu-Daudé 2022-11-28 21:27:38 +01:00 committed by Stefan Hajnoczi
parent 61c34fc194
commit b1901de83a
1 changed files with 19 additions and 0 deletions
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19
hw/display/qxl.h
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@ -147,6 +147,25 @@ OBJECT_DECLARE_SIMPLE_TYPE(PCIQXLDevice, PCI_QXL)
#define QXL_DEFAULT_REVISION (QXL_REVISION_STABLE_V12 + 1)
/* qxl.c */
/**
* qxl_phys2virt: Get a pointer within a PCI VRAM memory region.
*
* @qxl: QXL device
* @phys: physical offset of buffer within the VRAM
* @group_id: memory slot group
*
* Returns a host pointer to a buffer placed at offset @phys within the
* active slot @group_id of the PCI VGA RAM memory region associated with
* the @qxl device. If the slot is inactive, or the offset is out
* of the memory region, returns NULL.
*
* Use with care; by the time this function returns, the returned pointer is
* not protected by RCU anymore. If the caller is not within an RCU critical
* section and does not hold the iothread lock, it must have other means of
* protecting the pointer, such as a reference to the region that includes
* the incoming ram_addr_t.
*
*/
void *qxl_phys2virt(PCIQXLDevice *qxl, QXLPHYSICAL phys, int group_id);
void qxl_set_guest_bug(PCIQXLDevice *qxl, const char *msg, ...)
G_GNUC_PRINTF(2, 3);