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drm/i915/dmc: extract function to parse dmc_header

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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.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190607091230.1489-7-lucas.demarchi@intel.com
This commit is contained in:
Lucas De Marchi 2019-06-07 02:12:27 -07:00
parent 32fd773384
commit 08f8984fd7
1 changed files with 74 additions and 56 deletions
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130
drivers/gpu/drm/i915/intel_csr.c
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@ -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));
r = parse_csr_fw_dmc(csr, dmc_header, fw->size - readcount);
if (!r)
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");
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)