Skip to content

[linux-nvidia-6.17] Use architecture specific HBM training status register #331

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
ankita-nv wants to merge 1 commit into
base: 24.04_linux-nvidia-6.17-next
Choose a base branch
from
Open

[linux-nvidia-6.17] Use architecture specific HBM training status register #331

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
17 changes: 16 additions & 1 deletion drivers/vfio/pci/nvgrace-gpu/main.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,9 @@

#define C2C_LINK_BAR0_OFFSET 0x1498
#define HBM_TRAINING_BAR0_OFFSET 0x200BC
#define HBM_TRAINING_BAR0_OFFSET_BLACKWELL_NEXT 0xAD00BC
#define BOOT_42_OFFSET 0xA00
#define BOOT_42_ARCHITECTURE_BLACKWELL 0x0000001A
#define STATUS_READY 0xFF

#define POLL_QUANTUM_MS 1000
Expand Down Expand Up @@ -245,13 +248,25 @@ static void nvgrace_gpu_close_device(struct vfio_device *core_vdev)
vfio_pci_core_close_device(core_vdev);
}

static u32 hbm_training_offset(void __iomem *io)
{
u32 reg = ioread32(io + BOOT_42_OFFSET);
u32 arch = FIELD_GET(GENMASK(29, 24), reg);
u32 offset = (arch > BOOT_42_ARCHITECTURE_BLACKWELL) ?
HBM_TRAINING_BAR0_OFFSET_BLACKWELL_NEXT :
HBM_TRAINING_BAR0_OFFSET;

return offset;
}

static int nvgrace_gpu_wait_device_ready(void __iomem *io)
{
unsigned long timeout = jiffies + msecs_to_jiffies(POLL_TIMEOUT_MS);
u32 hbm_offset = hbm_training_offset(io);

do {
if ((ioread32(io + C2C_LINK_BAR0_OFFSET) == STATUS_READY) &&
(ioread32(io + HBM_TRAINING_BAR0_OFFSET) == STATUS_READY))
(ioread32(io + hbm_offset) == STATUS_READY))
return 0;
msleep(POLL_QUANTUM_MS);
} while (!time_after(jiffies, timeout));
Expand Down