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habanalabs/gaudi2: map virtual MSI-X doorbell memory for user

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Upon the initialization of a user context, map the host memory page of
the virtual MSI-X doorbell in the device MMU.
A reserved VA is used for this purpose, so user can use it directly
without any allocation/map operation.

Signed-off-by: Tomer Tayar <ttayar@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
This commit is contained in:
Tomer Tayar 2022-06-30 22:05:51 +03:00 committed by Oded Gabbay
parent 3f043b3192
commit 168fc71857
2 changed files with 44 additions and 2 deletions
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43
drivers/misc/habanalabs/gaudi2/gaudi2.c
View file

@ -1920,7 +1920,7 @@ static int gaudi2_set_fixed_properties(struct hl_device *hdev)
prop->pmmu.hop_table_size = prop->mmu_hop_table_size;
prop->pmmu.hop0_tables_total_size = prop->mmu_hop0_tables_total_size;
prop->hints_host_reserved_va_range.start_addr = RESERVED_VA_RANGE_FOR_ARC_ON_HOST_START;
prop->hints_host_reserved_va_range.start_addr = RESERVED_VA_FOR_VIRTUAL_MSIX_DOORBELL_START;
prop->hints_host_reserved_va_range.end_addr = RESERVED_VA_RANGE_FOR_ARC_ON_HOST_END;
prop->hints_host_hpage_reserved_va_range.start_addr =
RESERVED_VA_RANGE_FOR_ARC_ON_HOST_HPAGE_START;
@ -9236,6 +9236,35 @@ static void gaudi2_restore_user_registers(struct hl_device *hdev)
gaudi2_restore_user_qm_registers(hdev);
}
static int gaudi2_map_virtual_msix_doorbell_memory(struct hl_ctx *ctx)
{
struct hl_device *hdev = ctx->hdev;
struct asic_fixed_properties *prop = &hdev->asic_prop;
struct gaudi2_device *gaudi2 = hdev->asic_specific;
int rc;
rc = hl_mmu_map_page(ctx, RESERVED_VA_FOR_VIRTUAL_MSIX_DOORBELL_START,
gaudi2->virt_msix_db_dma_addr, prop->pmmu.page_size, true);
if (rc)
dev_err(hdev->dev, "Failed to map VA %#llx for virtual MSI-X doorbell memory\n",
RESERVED_VA_FOR_VIRTUAL_MSIX_DOORBELL_START);
return rc;
}
static void gaudi2_unmap_virtual_msix_doorbell_memory(struct hl_ctx *ctx)
{
struct hl_device *hdev = ctx->hdev;
struct asic_fixed_properties *prop = &hdev->asic_prop;
int rc;
rc = hl_mmu_unmap_page(ctx, RESERVED_VA_FOR_VIRTUAL_MSIX_DOORBELL_START,
prop->pmmu.page_size, true);
if (rc)
dev_err(hdev->dev, "Failed to unmap VA %#llx of virtual MSI-X doorbell memory\n",
RESERVED_VA_FOR_VIRTUAL_MSIX_DOORBELL_START);
}
static int gaudi2_ctx_init(struct hl_ctx *ctx)
{
int rc;
@ -9252,7 +9281,15 @@ static int gaudi2_ctx_init(struct hl_ctx *ctx)
else
gaudi2_restore_user_registers(ctx->hdev);
return gaudi2_internal_cb_pool_init(ctx->hdev, ctx);
rc = gaudi2_internal_cb_pool_init(ctx->hdev, ctx);
if (rc)
return rc;
rc = gaudi2_map_virtual_msix_doorbell_memory(ctx);
if (rc)
gaudi2_internal_cb_pool_fini(ctx->hdev, ctx);
return rc;
}
static void gaudi2_ctx_fini(struct hl_ctx *ctx)
@ -9261,6 +9298,8 @@ static void gaudi2_ctx_fini(struct hl_ctx *ctx)
return;
gaudi2_internal_cb_pool_fini(ctx->hdev, ctx);
gaudi2_unmap_virtual_msix_doorbell_memory(ctx);
}
static int gaudi2_pre_schedule_cs(struct hl_cs *cs)

3
drivers/misc/habanalabs/include/gaudi2/gaudi2.h
View file

@ -54,6 +54,9 @@
#define RESERVED_VA_RANGE_FOR_ARC_ON_HBM_START 0x1001500000000000ull
#define RESERVED_VA_RANGE_FOR_ARC_ON_HBM_END 0x10016FFFFFFFFFFFull
#define RESERVED_VA_FOR_VIRTUAL_MSIX_DOORBELL_START 0xFFF077FFFFFF0000ull
#define RESERVED_VA_FOR_VIRTUAL_MSIX_DOORBELL_END 0xFFF077FFFFFFFFFFull
#define RESERVED_VA_RANGE_FOR_ARC_ON_HOST_START 0xFFF0780000000000ull
#define RESERVED_VA_RANGE_FOR_ARC_ON_HOST_END 0xFFF07FFFFFFFFFFFull