net/i40e/base: add NVM acquire with custom timeout

On some platforms, during NVM update the adapter is getting disabled for
long time due to lock in OID_INTEL_FLASH_INFO. At this time, access to
NVM is locked by the tool that updates NVM. As result, driver is unable to
access NVM and it should timeout quickly. This patch adds custom timeout
for that case.

Signed-off-by: Midde Ajijur Rehaman <ajijurx.rehaman.midde@intel.com>
Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>

.mailmap

@@ -997,6 +997,7 @@ Michal Schmidt <mschmidt@redhat.com>
 Michal Swiatkowski <michal.swiatkowski@intel.com>
 Michal Wilczynski <michal.wilczynski@intel.com>
 Michel Machado <michel@digirati.com.br>
+Midde Ajijur Rehaman <ajijurx.rehaman.midde@intel.com>
 Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com>
 Mihai Pogonaru <pogonarumihai@gmail.com>
 Mike Baucom <michael.baucom@broadcom.com>

drivers/net/i40e/base/i40e_nvm.c

@@ -110,6 +110,75 @@ enum i40e_status_code i40e_acquire_nvm(struct i40e_hw *hw,
 	return ret_code;
 }
 
+
+/**
+ * i40e_acquire_nvm_ex - Specific request only for
+ * OID_INTEL_FLASH_INFO_TIMEOUT for acquiring the NVM ownership
+ * @hw: pointer to the HW structure
+ * @access: NVM access type (read or write)
+ * @custom_timeout: timeout for aquire NVM (read)
+ *
+ * This function will request NVM ownership for reading
+ * via the proper Admin Command.
+ **/
+
+enum i40e_status_code i40e_acquire_nvm_ex(struct i40e_hw *hw,
+				       enum i40e_aq_resource_access_type access,
+					   u32 custom_timeout)
+{
+	enum i40e_status_code ret_code = I40E_SUCCESS;
+	u64 gtime, timeout;
+	u64 time_left = 0;
+
+	DEBUGFUNC("i40e_acquire_nvm");
+
+	if (hw->nvm.blank_nvm_mode)
+		goto i40e_i40e_acquire_nvm_exit;
+
+	ret_code = i40e_aq_request_resource(hw, I40E_NVM_RESOURCE_ID, access,
+					    0, &time_left, NULL);
+	/* Reading the Global Device Timer */
+	gtime = rd32(hw, I40E_GLVFGEN_TIMER);
+
+	/* Store the timeout */
+	hw->nvm.hw_semaphore_timeout = I40E_MS_TO_GTIME(time_left) + gtime;
+
+	if (ret_code)
+		i40e_debug(hw, I40E_DEBUG_NVM,
+			   "NVM acquire type %d failed time_left=%llu ret=%d aq_err=%d\n",
+			   access, (unsigned long long)time_left, ret_code,
+			   hw->aq.asq_last_status);
+
+	if (ret_code && time_left) {
+		/* Poll until the current NVM owner timeouts */
+		timeout = I40E_MS_TO_GTIME(custom_timeout) + gtime;
+		while ((gtime < timeout) && time_left) {
+			i40e_msec_delay(10);
+			gtime = rd32(hw, I40E_GLVFGEN_TIMER);
+			ret_code = i40e_aq_request_resource(hw,
+							I40E_NVM_RESOURCE_ID,
+							access, 0, &time_left,
+							NULL);
+			if (ret_code == I40E_SUCCESS) {
+				hw->nvm.hw_semaphore_timeout =
+					    I40E_MS_TO_GTIME(time_left) + gtime;
+				break;
+			}
+		}
+		if (ret_code != I40E_SUCCESS) {
+			hw->nvm.hw_semaphore_timeout = 0;
+			i40e_debug(hw, I40E_DEBUG_NVM,
+				   "NVM acquire timed out, wait %llu ms before trying again. status=%d aq_err=%d\n",
+				   (unsigned long long)time_left, ret_code,
+				   hw->aq.asq_last_status);
+		}
+	}
+
+i40e_i40e_acquire_nvm_exit:
+	return ret_code;
+}
+
+
 /**
  * i40e_release_nvm - Generic request for releasing the NVM ownership
  * @hw: pointer to the HW structure
@@ -339,6 +408,32 @@ enum i40e_status_code i40e_read_nvm_word(struct i40e_hw *hw, u16 offset,
 	return ret_code;
 }
 
+/**
+ * i40e_read_nvm_word_ex - Specific request only for
+ * OID_INTEL_FLASH_INFO_TIMEOUT for Reads NVM word, acquires lock if necessary
+ * @hw: pointer to the HW structure
+ * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF)
+ * @data: word read from the Shadow RAM
+ * @custom_timeout: timeout for aquire NVM (read)
+ *
+ * Reads one 16 bit word from the Shadow RAM.
+ **/
+enum i40e_status_code i40e_read_nvm_word_ex(struct i40e_hw *hw, u16 offset,
+					 u16 *data, u32 custom_timeout)
+{
+	enum i40e_status_code ret_code = I40E_SUCCESS;
+
+	if (hw->flags & I40E_HW_FLAG_NVM_READ_REQUIRES_LOCK)
+		ret_code = i40e_acquire_nvm_ex(hw, I40E_RESOURCE_READ, custom_timeout);
+
+	if (ret_code)
+		return ret_code;
+	ret_code = __i40e_read_nvm_word(hw, offset, data);
+	if (hw->flags & I40E_HW_FLAG_NVM_READ_REQUIRES_LOCK)
+		i40e_release_nvm(hw);
+	return ret_code;
+}
+
 /**
  * i40e_read_nvm_module_data - Reads NVM Buffer to specified memory location
  * @hw: Pointer to the HW structure

drivers/net/i40e/base/i40e_prototype.h

@@ -464,9 +464,14 @@ enum i40e_aq_link_speed i40e_get_link_speed(struct i40e_hw *hw);
 enum i40e_status_code i40e_init_nvm(struct i40e_hw *hw);
 enum i40e_status_code i40e_acquire_nvm(struct i40e_hw *hw,
 				      enum i40e_aq_resource_access_type access);
+enum i40e_status_code i40e_acquire_nvm_ex(struct i40e_hw *hw,
+				       enum i40e_aq_resource_access_type access,
+					   u32 custom_timeout);
 void i40e_release_nvm(struct i40e_hw *hw);
 enum i40e_status_code i40e_read_nvm_word(struct i40e_hw *hw, u16 offset,
 					 u16 *data);
+enum i40e_status_code i40e_read_nvm_word_ex(struct i40e_hw *hw, u16 offset,
+					 u16 *data, u32 custom_timeout);
 enum i40e_status_code
 i40e_read_nvm_module_data(struct i40e_hw *hw, u8 module_ptr, u16 module_offset,
 			  u16 data_offset, u16 words_data_size, u16 *data_ptr);