media: venus: core: add support to dump FW region

Add support to dump video FW region during FW crash
using devcoredump helpers.
Signed-off-by: Dikshita Agarwal <dikshita@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/qcom/venus/core.c

@@ -7,6 +7,7 @@
 #include <linux/interconnect.h>
 #include <linux/ioctl.h>
 #include <linux/delay.h>
+#include <linux/devcoredump.h>
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
@@ -22,6 +23,33 @@
 #include "firmware.h"
 #include "pm_helpers.h"
 
+static void venus_coredump(struct venus_core *core)
+{
+	struct device *dev;
+	phys_addr_t mem_phys;
+	size_t mem_size;
+	void *mem_va;
+	void *data;
+
+	dev = core->dev;
+	mem_phys = core->fw.mem_phys;
+	mem_size = core->fw.mem_size;
+
+	mem_va = memremap(mem_phys, mem_size, MEMREMAP_WC);
+	if (!mem_va)
+		return;
+
+	data = vmalloc(mem_size);
+	if (!data) {
+		memunmap(mem_va);
+		return;
+	}
+
+	memcpy(data, mem_va, mem_size);
+	memunmap(mem_va);
+	dev_coredumpv(dev, data, mem_size, GFP_KERNEL);
+}
+
 static void venus_event_notify(struct venus_core *core, u32 event)
 {
 	struct venus_inst *inst;
@@ -67,6 +95,8 @@ static void venus_sys_error_handler(struct work_struct *work)
 
 	venus_shutdown(core);
 
+	venus_coredump(core);
+
 	pm_runtime_put_sync(core->dev);
 
 	while (core->pmdomains[0] && pm_runtime_active(core->pmdomains[0]))

drivers/media/platform/qcom/venus/core.h

@@ -144,6 +144,8 @@ struct venus_core {
 		struct device *dev;
 		struct iommu_domain *iommu_domain;
 		size_t mapped_mem_size;
+		phys_addr_t mem_phys;
+		size_t mem_size;
 	} fw;
 	struct mutex lock;
 	struct list_head instances;

drivers/media/platform/qcom/venus/firmware.c

@@ -201,6 +201,9 @@ int venus_boot(struct venus_core *core)
 		return -EINVAL;
 	}
 
+	core->fw.mem_size = mem_size;
+	core->fw.mem_phys = mem_phys;
+
 	if (core->use_tz)
 		ret = qcom_scm_pas_auth_and_reset(VENUS_PAS_ID);
 	else