drm/i915/uc: Remove redundant RSA offset definition

According to Firmware layout definition, RSA signature is located
after CSS header and uCode so actual RSA offset in the blob can be
easily calculated when needed (and we need it only once).
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/20190726184212.1836-3-michal.wajdeczko@intel.com

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

@@ -238,7 +238,6 @@ void intel_uc_fw_fetch(struct intel_uc_fw *uc_fw, struct drm_i915_private *i915)
 		err = -ENOEXEC;
 		goto fail;
 	}
-	uc_fw->rsa_offset = sizeof(struct uc_css_header) + uc_fw->ucode_size;
 	uc_fw->rsa_size = css->key_size_dw * sizeof(u32);
 
 	/* At least, it should have header, uCode and RSA. Size of all three. */
@@ -512,11 +511,11 @@ size_t intel_uc_fw_copy_rsa(struct intel_uc_fw *uc_fw, void *dst, u32 max_len)
 {
 	struct sg_table *pages = uc_fw->obj->mm.pages;
 	u32 size = min_t(u32, uc_fw->rsa_size, max_len);
+	u32 offset = sizeof(struct uc_css_header) + uc_fw->ucode_size;
 
 	GEM_BUG_ON(!intel_uc_fw_is_available(uc_fw));
 
-	return sg_pcopy_to_buffer(pages->sgl, pages->nents,
-				  dst, size, uc_fw->rsa_offset);
+	return sg_pcopy_to_buffer(pages->sgl, pages->nents, dst, size, offset);
 }
 
 /**
@@ -536,6 +535,5 @@ void intel_uc_fw_dump(const struct intel_uc_fw *uc_fw, struct drm_printer *p)
 		   uc_fw->major_ver_wanted, uc_fw->minor_ver_wanted,
 		   uc_fw->major_ver_found, uc_fw->minor_ver_found);
 	drm_printf(p, "\tuCode: %u bytes\n", uc_fw->ucode_size);
-	drm_printf(p, "\tRSA: offset %u, size %u\n",
-		   uc_fw->rsa_offset, uc_fw->rsa_size);
+	drm_printf(p, "\tRSA: %u bytes\n", uc_fw->rsa_size);
 }

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

@@ -75,7 +75,6 @@ struct intel_uc_fw {
 	u16 minor_ver_found;
 
 	u32 rsa_size;
-	u32 rsa_offset;
 	u32 ucode_size;
 };