drm/radeon: implement simple doorbell page allocator
The doorbell aperture is a PCI BAR whose pages can be
mapped to compute resources for things like wptrs
for userspace queues.
This patch maps the BAR and sets up a simple allocator
to allocate pages from the BAR.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index a61c373..a8161d0 100644
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -121,6 +121,44 @@
return reference_clock;
}
+/**
+ * cik_mm_rdoorbell - read a doorbell dword
+ *
+ * @rdev: radeon_device pointer
+ * @offset: byte offset into the aperture
+ *
+ * Returns the value in the doorbell aperture at the
+ * requested offset (CIK).
+ */
+u32 cik_mm_rdoorbell(struct radeon_device *rdev, u32 offset)
+{
+ if (offset < rdev->doorbell.size) {
+ return readl(((void __iomem *)rdev->doorbell.ptr) + offset);
+ } else {
+ DRM_ERROR("reading beyond doorbell aperture: 0x%08x!\n", offset);
+ return 0;
+ }
+}
+
+/**
+ * cik_mm_wdoorbell - write a doorbell dword
+ *
+ * @rdev: radeon_device pointer
+ * @offset: byte offset into the aperture
+ * @v: value to write
+ *
+ * Writes @v to the doorbell aperture at the
+ * requested offset (CIK).
+ */
+void cik_mm_wdoorbell(struct radeon_device *rdev, u32 offset, u32 v)
+{
+ if (offset < rdev->doorbell.size) {
+ writel(v, ((void __iomem *)rdev->doorbell.ptr) + offset);
+ } else {
+ DRM_ERROR("writing beyond doorbell aperture: 0x%08x!\n", offset);
+ }
+}
+
#define BONAIRE_IO_MC_REGS_SIZE 36
static const u32 bonaire_io_mc_regs[BONAIRE_IO_MC_REGS_SIZE][2] =