[Intel-gfx] [PATCH 6/9] drm/i915/dmc: extract function to parse dmc_header

[Srivatsa, Anusha]

>-----Original Message-----
>From: De Marchi, Lucas
>Sent: Friday, June 7, 2019 2:12 AM
>To: intel-gfx at lists.freedesktop.org
>Cc: Vivi, Rodrigo <rodrigo.vivi at intel.com>; Srivatsa, Anusha
><anusha.srivatsa at intel.com>; De Marchi, Lucas <lucas.demarchi at intel.com>
>Subject: [PATCH 6/9] drm/i915/dmc: extract function to parse dmc_header
>
>Complete the extraction of functions to parse specific parts of the firmware. The
>return of the function parse_csr_fw() is now redundant since it already sets the
>dmc_payload field. Changing it is left for later to avoid noise in the commit.
>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
>Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
>---
> drivers/gpu/drm/i915/intel_csr.c | 130 ++++++++++++++++++-------------
> 1 file changed, 74 insertions(+), 56 deletions(-)
>
>diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c
>index db5772616a4f..1fb42fd44519 100644
>--- a/drivers/gpu/drm/i915/intel_csr.c
>+++ b/drivers/gpu/drm/i915/intel_csr.c
>@@ -332,6 +332,74 @@ static u32 find_dmc_fw_offset(const struct
>intel_fw_info *fw_info,
> 	return dmc_offset;
> }
>
>+static u32 parse_csr_fw_dmc(struct intel_csr *csr,
>+			    const struct intel_dmc_header *dmc_header,
>+			    size_t rem_size)
>+{
>+	unsigned int i, payload_size;
>+	u32 r;
>+	u8 *payload;
>+
>+	if (rem_size < sizeof(struct intel_dmc_header))
>+		goto error_truncated;
>+
>+	if (sizeof(struct intel_dmc_header) != dmc_header->header_len) {
>+		DRM_ERROR("DMC firmware has wrong dmc header length "
>+			  "(%u bytes)\n",
>+			  (dmc_header->header_len));
>+		return 0;
>+	}
>+
>+	/* Cache the dmc header info. */
>+	if (dmc_header->mmio_count > ARRAY_SIZE(csr->mmioaddr)) {
>+		DRM_ERROR("DMC firmware has wrong mmio count %u\n",
>+			  dmc_header->mmio_count);
>+		return 0;
>+	}
>+
>+	csr->mmio_count = dmc_header->mmio_count;
>+	for (i = 0; i < dmc_header->mmio_count; i++) {
>+		if (dmc_header->mmioaddr[i] < CSR_MMIO_START_RANGE ||
>+		    dmc_header->mmioaddr[i] > CSR_MMIO_END_RANGE) {
>+			DRM_ERROR("DMC firmware has wrong mmio address
>0x%x\n",
>+				  dmc_header->mmioaddr[i]);
>+			return 0;
>+		}
>+		csr->mmioaddr[i] = _MMIO(dmc_header->mmioaddr[i]);
>+		csr->mmiodata[i] = dmc_header->mmiodata[i];
>+	}
>+
>+	rem_size -= dmc_header->header_len;
>+
>+	/* fw_size is in dwords, so multiplied by 4 to convert into bytes. */
>+	payload_size = dmc_header->fw_size * 4;
>+	if (rem_size < payload_size)
>+		goto error_truncated;
>+
>+	if (payload_size > csr->max_fw_size) {
>+		DRM_ERROR("DMC FW too big (%u bytes)\n", payload_size);
>+		return 0;
>+	}
>+	csr->dmc_fw_size = dmc_header->fw_size;
>+
>+	csr->dmc_payload = kmalloc(payload_size, GFP_KERNEL);
>+	if (!csr->dmc_payload) {
>+		DRM_ERROR("Memory allocation failed for dmc payload\n");
>+		return 0;
>+	}
>+
>+	r = sizeof(struct intel_dmc_header);
>+	payload = (u8 *)(dmc_header) + r;
>+	memcpy(csr->dmc_payload, payload, payload_size);
>+	r += payload_size;
>+
>+	return r;
>+
>+error_truncated:
>+	DRM_ERROR("Truncated DMC firmware, refusing.\n");
>+	return 0;
>+}
>+
> static u32
> parse_csr_fw_package(struct intel_csr *csr,
> 		     const struct intel_package_header *package_header, @@ -
>432,10 +500,8 @@ static u32 *parse_csr_fw(struct drm_i915_private *dev_priv,
> 	struct intel_dmc_header *dmc_header;
> 	struct intel_csr *csr = &dev_priv->csr;
> 	const struct stepping_info *si = intel_get_stepping_info(dev_priv);
>-	u32 readcount = 0, nbytes;
>-	u32 i, r;
>-	u32 *dmc_payload;
>-	size_t fsize;
>+	u32 readcount = 0;
>+	u32 r;
>
> 	if (!fw)
> 		return NULL;
>@@ -455,62 +521,14 @@ static u32 *parse_csr_fw(struct drm_i915_private
>*dev_priv,
> 		return NULL;
>
> 	readcount += r;
>-	fsize = readcount +
>-		sizeof(struct intel_dmc_header);
>-	if (fsize > fw->size)
>-		goto error_truncated;
>
>-	/* Extract dmc_header information. */
>+	/* Extract dmc_header information */
> 	dmc_header = (struct intel_dmc_header *)&fw->data[readcount];
>-	if (sizeof(struct intel_dmc_header) != (dmc_header->header_len)) {
>-		DRM_ERROR("DMC firmware has wrong dmc header length "
>-			  "(%u bytes)\n",
>-			  (dmc_header->header_len));
>-		return NULL;
>-	}
>-	readcount += sizeof(struct intel_dmc_header);
>-
>-	/* Cache the dmc header info. */
>-	if (dmc_header->mmio_count > ARRAY_SIZE(csr->mmioaddr)) {
>-		DRM_ERROR("DMC firmware has wrong mmio count %u\n",
>-			  dmc_header->mmio_count);
>-		return NULL;
>-	}
>-	csr->mmio_count = dmc_header->mmio_count;
>-	for (i = 0; i < dmc_header->mmio_count; i++) {
>-		if (dmc_header->mmioaddr[i] < CSR_MMIO_START_RANGE ||
>-		    dmc_header->mmioaddr[i] > CSR_MMIO_END_RANGE) {
>-			DRM_ERROR("DMC firmware has wrong mmio address
>0x%x\n",
>-				  dmc_header->mmioaddr[i]);
>-			return NULL;
>-		}
>-		csr->mmioaddr[i] = _MMIO(dmc_header->mmioaddr[i]);
>-		csr->mmiodata[i] = dmc_header->mmiodata[i];
>-	}
>-
>-	/* fw_size is in dwords, so multiplied by 4 to convert into bytes. */
>-	nbytes = dmc_header->fw_size * 4;
>-	fsize += nbytes;
>-	if (fsize > fw->size)
>-		goto error_truncated;
>-
>-	if (nbytes > csr->max_fw_size) {
>-		DRM_ERROR("DMC FW too big (%u bytes)\n", nbytes);
>-		return NULL;
>-	}
>-	csr->dmc_fw_size = dmc_header->fw_size;
>-
>-	dmc_payload = kmalloc(nbytes, GFP_KERNEL);
>-	if (!dmc_payload) {
>-		DRM_ERROR("Memory allocation failed for dmc payload\n");
>+	r = parse_csr_fw_dmc(csr, dmc_header, fw->size - readcount);
>+	if (!r)
> 		return NULL;
>-	}
>
>-	return memcpy(dmc_payload, &fw->data[readcount], nbytes);
>-
>-error_truncated:
>-	DRM_ERROR("Truncated DMC firmware, rejecting.\n");
>-	return NULL;
>+	return csr->dmc_payload;
> }
>
> static void intel_csr_runtime_pm_get(struct drm_i915_private *dev_priv)
>--
>2.21.0