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authorOmer Shpigelman <oshpigelman@habana.ai>2019-05-01 14:38:38 +0300
committerOded Gabbay <oded.gabbay@gmail.com>2019-05-24 22:46:15 +0300
commit89225ce4fc43da2db968923fc94e1469dbcdbd5a (patch)
tree2e07242d5a6ada3012f753403ce5505807f75a8f /drivers/misc
parenta188339ca5a396acc588e5851ed7e19f66b0ebd9 (diff)
downloadlinux-89225ce4fc43da2db968923fc94e1469dbcdbd5a.tar.bz2
habanalabs: halt debug engines on user process close
This patch fix a potential bug where a user's process has closed unexpectedly without disabling the debug engines. In that case, the debug engines might continue running but because the user's MMU mappings are going away, we will get page fault errors. This behavior is also opposed to the general rule where nothing runs on the device after the user process closes. The patch stops the debug H/W engines upon process termination and thus makes sure nothing runs on the device after the process goes away. Signed-off-by: Omer Shpigelman <oshpigelman@habana.ai> Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/habanalabs/context.c6
-rw-r--r--drivers/misc/habanalabs/goya/goya.c3
-rw-r--r--drivers/misc/habanalabs/goya/goyaP.h1
-rw-r--r--drivers/misc/habanalabs/goya/goya_coresight.c17
-rw-r--r--drivers/misc/habanalabs/habanalabs.h2
5 files changed, 28 insertions, 1 deletions
diff --git a/drivers/misc/habanalabs/context.c b/drivers/misc/habanalabs/context.c
index 4804cdcf4c48..f4c92f110a72 100644
--- a/drivers/misc/habanalabs/context.c
+++ b/drivers/misc/habanalabs/context.c
@@ -26,6 +26,12 @@ static void hl_ctx_fini(struct hl_ctx *ctx)
dma_fence_put(ctx->cs_pending[i]);
if (ctx->asid != HL_KERNEL_ASID_ID) {
+ /*
+ * The engines are stopped as there is no executing CS, but the
+ * Coresight might be still working by accessing addresses
+ * related to the stopped engines. Hence stop it explicitly.
+ */
+ hdev->asic_funcs->halt_coresight(hdev);
hl_vm_ctx_fini(ctx);
hl_asid_free(hdev, ctx->asid);
}
diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
index a582e29c1ee4..02d116b01a1a 100644
--- a/drivers/misc/habanalabs/goya/goya.c
+++ b/drivers/misc/habanalabs/goya/goya.c
@@ -4819,7 +4819,8 @@ static const struct hl_asic_funcs goya_funcs = {
.set_dram_bar_base = goya_set_ddr_bar_base,
.init_iatu = goya_init_iatu,
.rreg = hl_rreg,
- .wreg = hl_wreg
+ .wreg = hl_wreg,
+ .halt_coresight = goya_halt_coresight
};
/*
diff --git a/drivers/misc/habanalabs/goya/goyaP.h b/drivers/misc/habanalabs/goya/goyaP.h
index 14e216cb3668..c83cab0d641e 100644
--- a/drivers/misc/habanalabs/goya/goyaP.h
+++ b/drivers/misc/habanalabs/goya/goyaP.h
@@ -202,6 +202,7 @@ void goya_add_device_attr(struct hl_device *hdev,
struct attribute_group *dev_attr_grp);
int goya_armcp_info_get(struct hl_device *hdev);
int goya_debug_coresight(struct hl_device *hdev, void *data);
+void goya_halt_coresight(struct hl_device *hdev);
void goya_mmu_prepare(struct hl_device *hdev, u32 asid);
int goya_mmu_clear_pgt_range(struct hl_device *hdev);
diff --git a/drivers/misc/habanalabs/goya/goya_coresight.c b/drivers/misc/habanalabs/goya/goya_coresight.c
index 1ac951f52d1e..39f62ce72660 100644
--- a/drivers/misc/habanalabs/goya/goya_coresight.c
+++ b/drivers/misc/habanalabs/goya/goya_coresight.c
@@ -626,3 +626,20 @@ int goya_debug_coresight(struct hl_device *hdev, void *data)
return rc;
}
+
+void goya_halt_coresight(struct hl_device *hdev)
+{
+ struct hl_debug_params params = {};
+ int i, rc;
+
+ for (i = GOYA_ETF_FIRST ; i <= GOYA_ETF_LAST ; i++) {
+ params.reg_idx = i;
+ rc = goya_config_etf(hdev, &params);
+ if (rc)
+ dev_err(hdev->dev, "halt ETF failed, %d/%d\n", rc, i);
+ }
+
+ rc = goya_config_etr(hdev, &params);
+ if (rc)
+ dev_err(hdev->dev, "halt ETR failed, %d\n", rc);
+}
diff --git a/drivers/misc/habanalabs/habanalabs.h b/drivers/misc/habanalabs/habanalabs.h
index 71243b319920..adef7d9d7488 100644
--- a/drivers/misc/habanalabs/habanalabs.h
+++ b/drivers/misc/habanalabs/habanalabs.h
@@ -501,6 +501,7 @@ enum hl_pll_frequency {
* @init_iatu: Initialize the iATU unit inside the PCI controller.
* @rreg: Read a register. Needed for simulator support.
* @wreg: Write a register. Needed for simulator support.
+ * @halt_coresight: stop the ETF and ETR traces.
*/
struct hl_asic_funcs {
int (*early_init)(struct hl_device *hdev);
@@ -578,6 +579,7 @@ struct hl_asic_funcs {
int (*init_iatu)(struct hl_device *hdev);
u32 (*rreg)(struct hl_device *hdev, u32 reg);
void (*wreg)(struct hl_device *hdev, u32 reg, u32 val);
+ void (*halt_coresight)(struct hl_device *hdev);
};