drm/i915/uc: Remove redundant header_offset/size definitions

According to Firmware layout definition, CSS header is located
in front of the firmware blob, so header offset is always 0.
Similarly, size of the CSS header is constant and currently
used version is exactly 128.

While here, move type/status enums up and keep them together.

v2: use sizeof consistently (Daniele), update commit message
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190726184212.1836-1-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c

@@ -218,21 +218,18 @@ void intel_uc_fw_fetch(struct intel_uc_fw *uc_fw, struct drm_i915_private *i915)
 
 	css = (struct uc_css_header *)fw->data;
 
-	/* Firmware bits always start from header */
-	uc_fw->header_offset = 0;
-	uc_fw->header_size = (css->header_size_dw - css->modulus_size_dw -
-			      css->key_size_dw - css->exponent_size_dw) *
-			     sizeof(u32);
-
-	if (uc_fw->header_size != sizeof(struct uc_css_header)) {
+	/* Check integrity of size values inside CSS header */
+	size = (css->header_size_dw - css->key_size_dw - css->modulus_size_dw -
+		css->exponent_size_dw) * sizeof(u32);
+	if (size != sizeof(struct uc_css_header)) {
 		DRM_WARN("%s: Mismatched firmware header definition\n",
 			 intel_uc_fw_type_repr(uc_fw->type));
 		err = -ENOEXEC;
 		goto fail;
 	}
 
-	/* then, uCode */
-	uc_fw->ucode_offset = uc_fw->header_offset + uc_fw->header_size;
+	/* uCode size must calculated from other sizes */
+	uc_fw->ucode_offset = sizeof(struct uc_css_header);
 	uc_fw->ucode_size = (css->size_dw - css->header_size_dw) * sizeof(u32);
 
 	/* now RSA */
@@ -246,7 +243,7 @@ void intel_uc_fw_fetch(struct intel_uc_fw *uc_fw, struct drm_i915_private *i915)
 	uc_fw->rsa_size = css->key_size_dw * sizeof(u32);
 
 	/* At least, it should have header, uCode and RSA. Size of all three. */
-	size = uc_fw->header_size + uc_fw->ucode_size + uc_fw->rsa_size;
+	size = sizeof(struct uc_css_header) + uc_fw->ucode_size + uc_fw->rsa_size;
 	if (fw->size < size) {
 		DRM_WARN("%s: Truncated firmware (%zu, expected %zu)\n",
 			 intel_uc_fw_type_repr(uc_fw->type), fw->size, size);
@@ -371,7 +368,7 @@ static int uc_fw_xfer(struct intel_uc_fw *uc_fw, struct intel_gt *gt,
 	intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL);
 
 	/* Set the source address for the uCode */
-	offset = uc_fw_ggtt_offset(uc_fw, gt->ggtt) + uc_fw->header_offset;
+	offset = uc_fw_ggtt_offset(uc_fw, gt->ggtt);
 	GEM_BUG_ON(upper_32_bits(offset) & 0xFFFF0000);
 	intel_uncore_write_fw(uncore, DMA_ADDR_0_LOW, lower_32_bits(offset));
 	intel_uncore_write_fw(uncore, DMA_ADDR_0_HIGH, upper_32_bits(offset));
@@ -385,7 +382,7 @@ static int uc_fw_xfer(struct intel_uc_fw *uc_fw, struct intel_gt *gt,
 	 * via DMA, excluding any other components
 	 */
 	intel_uncore_write_fw(uncore, DMA_COPY_SIZE,
-			      uc_fw->header_size + uc_fw->ucode_size);
+			      sizeof(struct uc_css_header) + uc_fw->ucode_size);
 
 	/* Start the DMA */
 	intel_uncore_write_fw(uncore, DMA_CTRL,
@@ -539,8 +536,6 @@ void intel_uc_fw_dump(const struct intel_uc_fw *uc_fw, struct drm_printer *p)
 	drm_printf(p, "\tversion: wanted %u.%u, found %u.%u\n",
 		   uc_fw->major_ver_wanted, uc_fw->minor_ver_wanted,
 		   uc_fw->major_ver_found, uc_fw->minor_ver_found);
-	drm_printf(p, "\theader: offset %u, size %u\n",
-		   uc_fw->header_offset, uc_fw->header_size);
 	drm_printf(p, "\tuCode: offset %u, size %u\n",
 		   uc_fw->ucode_offset, uc_fw->ucode_size);
 	drm_printf(p, "\tRSA: offset %u, size %u\n",

drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h

@@ -26,6 +26,7 @@
 #define _INTEL_UC_FW_H_
 
 #include <linux/types.h>
+#include "intel_uc_fw_abi.h"
 #include "i915_gem.h"
 
 struct drm_printer;
@@ -57,10 +58,11 @@ enum intel_uc_fw_type {
  * of fetching, caching, and loading the firmware image into the uC.
  */
 struct intel_uc_fw {
+	enum intel_uc_fw_type type;
+	enum intel_uc_fw_status status;
 	const char *path;
 	size_t size;
 	struct drm_i915_gem_object *obj;
-	enum intel_uc_fw_status status;
 
 	/*
 	 * The firmware build process will generate a version header file with major and
@@ -72,9 +74,6 @@ struct intel_uc_fw {
 	u16 major_ver_found;
 	u16 minor_ver_found;
 
-	enum intel_uc_fw_type type;
-	u32 header_size;
-	u32 header_offset;
 	u32 rsa_size;
 	u32 rsa_offset;
 	u32 ucode_size;
@@ -163,7 +162,7 @@ static inline u32 intel_uc_fw_get_upload_size(struct intel_uc_fw *uc_fw)
 	if (!intel_uc_fw_is_available(uc_fw))
 		return 0;
 
-	return uc_fw->header_size + uc_fw->ucode_size;
+	return sizeof(struct uc_css_header) + uc_fw->ucode_size;
 }
 
 void intel_uc_fw_init_early(struct intel_uc_fw *uc_fw,

drivers/gpu/drm/i915/gt/uc/intel_uc_fw_abi.h

@@ -7,6 +7,7 @@
 #define _INTEL_UC_FW_ABI_H
 
 #include <linux/types.h>
+#include <linux/build_bug.h>
 
 /**
  * DOC: Firmware Layout
@@ -76,5 +77,6 @@ struct uc_css_header {
 	u32 reserved[14];
 	u32 header_info;
 } __packed;
+static_assert(sizeof(struct uc_css_header) == 128);
 
 #endif /* _INTEL_UC_FW_ABI_H */